id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1504.00915 | Natsumi Nagata | Junji Hisano, Koji Ishiwata, and Natsumi Nagata | QCD Effects on Direct Detection of Wino Dark Matter | 35 pages, 7 figures | null | null | IPMU15-0038, KANAZAWA-15-02, FTPI-MINN-15/16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We complete the calculation of the wino-nucleon scattering cross section up
to the next-to-leading order in $\alpha_s$. We assume that the other sparticles
are decoupled and wino interacts with the Standard Model particles via the weak
interaction. As a result, the uncertainties coming from the perturbative QCD
are significantly reduced to be smaller than those from the nucleon matrix
elements. The resultant scattering cross section is found to be larger than the
leading-order one by about 70%, which is well above the neutrino background. In
the limit of large wino mass the spin-independent scattering cross section with
proton turns out $\sigma_{\text{SI}}^p =
2.3~{}^{+0.2}_{-0.3}~{}^{+0.5}_{-0.4}\times 10^{-47}~ \text{cm}^2$ (errors come
from perturbative calculation and input parameters, respectively). The
computation for a generic SU(2)$_L$ multiplet dark matter is also presented.
| [
{
"created": "Fri, 3 Apr 2015 19:31:34 GMT",
"version": "v1"
}
] | 2015-04-06 | [
[
"Hisano",
"Junji",
""
],
[
"Ishiwata",
"Koji",
""
],
[
"Nagata",
"Natsumi",
""
]
] | We complete the calculation of the wino-nucleon scattering cross section up to the next-to-leading order in $\alpha_s$. We assume that the other sparticles are decoupled and wino interacts with the Standard Model particles via the weak interaction. As a result, the uncertainties coming from the perturbative QCD are significantly reduced to be smaller than those from the nucleon matrix elements. The resultant scattering cross section is found to be larger than the leading-order one by about 70%, which is well above the neutrino background. In the limit of large wino mass the spin-independent scattering cross section with proton turns out $\sigma_{\text{SI}}^p = 2.3~{}^{+0.2}_{-0.3}~{}^{+0.5}_{-0.4}\times 10^{-47}~ \text{cm}^2$ (errors come from perturbative calculation and input parameters, respectively). The computation for a generic SU(2)$_L$ multiplet dark matter is also presented. |
1112.5184 | Oscar Cata | Luigi Cappiello, Oscar Cata, Giancarlo D'Ambrosio and Dao-Neng Gao | K^+ -> pi^+pi^0e^+e^-: a novel short-distance probe | 25 pages, 6 figures | null | 10.1140/epjc/s10052-012-1872-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay K^+ -> pi^+ pi^0 e^+ e^-, currently under analysis by the
NA62 Collaboration at CERN. In particular, we provide a detailed analysis of
the Dalitz plot for the long-distance, gamma^*-mediated, contributions
(Bremsstrahlung, direct emission and its interference). We also examine a set
of asymmetries to isolate genuine short-distance effects. While we show that
charge asymmetries are not required to test short distances, they provide the
best environment for its detection. This constitutes by itself a strong
motivation for NA62 to study K^- decays in the future. We therefore provide a
detailed study of different charge asymmetries and the corresponding estimated
signals. Whenever possible, we make contact with the related processes K^+ ->
pi^+ pi^0 gamma and K_L -> pi^+ pi^- e^+ e^- and discuss the advantages of K^+
-> pi^+ pi^0 e^+ e^- over them.
| [
{
"created": "Wed, 21 Dec 2011 21:40:01 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Cappiello",
"Luigi",
""
],
[
"Cata",
"Oscar",
""
],
[
"D'Ambrosio",
"Giancarlo",
""
],
[
"Gao",
"Dao-Neng",
""
]
] | We study the decay K^+ -> pi^+ pi^0 e^+ e^-, currently under analysis by the NA62 Collaboration at CERN. In particular, we provide a detailed analysis of the Dalitz plot for the long-distance, gamma^*-mediated, contributions (Bremsstrahlung, direct emission and its interference). We also examine a set of asymmetries to isolate genuine short-distance effects. While we show that charge asymmetries are not required to test short distances, they provide the best environment for its detection. This constitutes by itself a strong motivation for NA62 to study K^- decays in the future. We therefore provide a detailed study of different charge asymmetries and the corresponding estimated signals. Whenever possible, we make contact with the related processes K^+ -> pi^+ pi^0 gamma and K_L -> pi^+ pi^- e^+ e^- and discuss the advantages of K^+ -> pi^+ pi^0 e^+ e^- over them. |
1202.0507 | Kentarou Mawatari | Kentarou Mawatari (Vrije Universiteit Brussel) | Associated production of light gravitinos at future linear colliders | 6 pages, 3 figures. Proceedings of the 2011 International Workshop on
Future Linear Colliders (LCWS11), Granada, Spain, 26-30 September 2011 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study light gravitino productions in association with a neutralino at
future linear colliders in a scenario in which the lightest SUSY particle is a
gravitino and the produced neutralino promptly decays into a photon and a
gravitino. Comparing with the multiple goldstino scenario, we show that energy
and angular distributions of the photon provide valuable information on the
SUSY masses as well as the SUSY breaking.
| [
{
"created": "Thu, 2 Feb 2012 18:08:04 GMT",
"version": "v1"
}
] | 2012-02-03 | [
[
"Mawatari",
"Kentarou",
"",
"Vrije Universiteit Brussel"
]
] | We study light gravitino productions in association with a neutralino at future linear colliders in a scenario in which the lightest SUSY particle is a gravitino and the produced neutralino promptly decays into a photon and a gravitino. Comparing with the multiple goldstino scenario, we show that energy and angular distributions of the photon provide valuable information on the SUSY masses as well as the SUSY breaking. |
2111.05951 | Santiago Bernal-Langarica | Alejandro Ayala, Santiago Bernal-Langarica, Cristian Villavicencio | Finite volume and magnetic field effects on the two-pion correlation
function in relativistic heavy-ion collisions | 7 pages, 10 figures. Version accepted to appear in PRD | null | 10.1103/PhysRevD.105.056001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the combined effects of a finite volume and an external magnetic
field on the charged two-pion correlation function. For these purposes, we
consider a dilute system of pions where the finite volume effects are
introduced computing the pion wave functions with rigid boundary conditions in
a cylindrical geometry in the presence of a uniform and constant magnetic
field. We find that for slow pions, namely, for the case where the average pair
momentum is small, the correlation function shows a large distortion, as
opposed to the case where the average pair momentum is large. For a finite
density system, the intercept of the correlation function is reduced, signaling
the increasing importance of the pion ground state contribution. An increasing
strength of the magnetic field reduces the importance of the ground state and
the intercept becomes closer to 2.
| [
{
"created": "Wed, 10 Nov 2021 21:21:56 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2022 18:44:50 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Ayala",
"Alejandro",
""
],
[
"Bernal-Langarica",
"Santiago",
""
],
[
"Villavicencio",
"Cristian",
""
]
] | We study the combined effects of a finite volume and an external magnetic field on the charged two-pion correlation function. For these purposes, we consider a dilute system of pions where the finite volume effects are introduced computing the pion wave functions with rigid boundary conditions in a cylindrical geometry in the presence of a uniform and constant magnetic field. We find that for slow pions, namely, for the case where the average pair momentum is small, the correlation function shows a large distortion, as opposed to the case where the average pair momentum is large. For a finite density system, the intercept of the correlation function is reduced, signaling the increasing importance of the pion ground state contribution. An increasing strength of the magnetic field reduces the importance of the ground state and the intercept becomes closer to 2. |
1206.1845 | Grace Dupuis | Grace Dupuis and James M. Cline | Top quark forward-backward asymmetry in R-parity violating supersymmetry | 24 pages, 7 figures. v3: included LHC top production cross section
data; model still consistent at 2 sigma level | null | 10.1007/JHEP01(2013)058 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interaction of bottom squark-mediated top quark pair production,
occurring in the R-parity violating minimal supersymmetric standard model
(MSSM), is proposed as an explanation of the anomalously large $t\bar{t}$
forward-backward asymmetry (FBA) observed at the Tevatron. We find that this
model can give a good fit to top quark data, both the inclusive and invariant
mass-dependent asymmetries, while remaining consistent (at the 2-$\sigma$
level) with the total and differential production cross-sections. The scenario
is challenged by strong constraints from atomic parity violation (APV), but we
point out an extra diagram for the effective down quark-Z vertex, involving the
same coupling constant as required for the FBA, which tends to weaken the APV
constraint, and which can nullify it for reasonable values of the top squark
masses and mixing angle. Large contributions to flavor-changing neutral
currents can be avoided if only the third generation of sparticles is light.
| [
{
"created": "Fri, 8 Jun 2012 19:32:17 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2012 18:00:24 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Sep 2012 18:44:49 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Dupuis",
"Grace",
""
],
[
"Cline",
"James M.",
""
]
] | The interaction of bottom squark-mediated top quark pair production, occurring in the R-parity violating minimal supersymmetric standard model (MSSM), is proposed as an explanation of the anomalously large $t\bar{t}$ forward-backward asymmetry (FBA) observed at the Tevatron. We find that this model can give a good fit to top quark data, both the inclusive and invariant mass-dependent asymmetries, while remaining consistent (at the 2-$\sigma$ level) with the total and differential production cross-sections. The scenario is challenged by strong constraints from atomic parity violation (APV), but we point out an extra diagram for the effective down quark-Z vertex, involving the same coupling constant as required for the FBA, which tends to weaken the APV constraint, and which can nullify it for reasonable values of the top squark masses and mixing angle. Large contributions to flavor-changing neutral currents can be avoided if only the third generation of sparticles is light. |
hep-ph/9809501 | Maura Barone | G. Conforto (1), M. Barone (2), C. Grimani (2) ((1) CERN, (2) Urbino) | Three-Flavour Neutrino-Mixing Implications of the LSND Result | 10 pages, 2 eps figures, LaTeX 2.09, revised for Physics Letters B | Phys.Lett.B447:122-126,1999 | 10.1016/S0370-2693(98)01580-9 | null | hep-ph | null | The LSND result is shown to fit into a minimal three-flavour neutrino-mixing
scenario capable of describing all known experimental facts provided the large
Delta M^2 = m_3^2 - m_2^2 \sim m_3^2 - m_1^2 lies in the range 2.5 x 10^{-1} <
Delta M^2 < 3.0 eV^2. In this range the value of P_{\mu\tau} is expected to be
about 5% or larger.
| [
{
"created": "Wed, 23 Sep 1998 16:19:07 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Dec 1998 18:03:30 GMT",
"version": "v2"
}
] | 2009-09-24 | [
[
"Conforto",
"G.",
"",
"CERN"
],
[
"Barone",
"M.",
"",
"Urbino"
],
[
"Grimani",
"C.",
"",
"Urbino"
]
] | The LSND result is shown to fit into a minimal three-flavour neutrino-mixing scenario capable of describing all known experimental facts provided the large Delta M^2 = m_3^2 - m_2^2 \sim m_3^2 - m_1^2 lies in the range 2.5 x 10^{-1} < Delta M^2 < 3.0 eV^2. In this range the value of P_{\mu\tau} is expected to be about 5% or larger. |
hep-ph/9705297 | Alan R. White | Alan R. White | The Pomeron Beyond BFKL | 6 pages, with 20 ps figures in the text. Presented at the 5th
International Workshop on Deep Inelastic Scattering and QCD, Chicago,
Illinois, USA, April 14-18, 1997 | null | 10.1063/1.53690 | ANL-HEP-CP-97-25 | hep-ph hep-th | null | Conformally invariant reggeon interactions derived from $t$-channel unitarity
are discussed and progress towards understanding the ``physical Pomeron'', via
massless quark reggeon interactions, is briefly outlined.
| [
{
"created": "Mon, 12 May 1997 18:42:28 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"White",
"Alan R.",
""
]
] | Conformally invariant reggeon interactions derived from $t$-channel unitarity are discussed and progress towards understanding the ``physical Pomeron'', via massless quark reggeon interactions, is briefly outlined. |
2211.12573 | Tamer Elkafrawy Dr. | Tamer Elkafrawy, Marcus Hohlmann, Teruki Kamon, and Paul Padley | Event characterization of dark bosons via exotic Higgs decays with final
states of displaced dimuons in high luminosity era of the LHC | 4 pages, 3 figures, ICHEP2022 | null | null | PoS(ICHEP2022)1023 | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigate the potential reach of a search for a long-lived/prompt dark
vector boson $Z_D$, also called dark $Z$, and a prompt dark Higgs boson $h_D$
through exotic decays of the observed Higgs boson $h$ into either $Z_DZ_D$,
$h_Dh_D$, or $ZZ_D$ with $Z$ being the hypercharge gauge boson. The $Z_D$
production through the Higgs portal is completed via one of two mechanisms,
kinetic mixing of $Z_D$ with $Z$ and the mixing of $h_D$ with $h$. All
production modes of $h$ are considered, while the branching fractions are
calculated in Monte Carlo simulation using the {\textsc{MadGraph5}}\_aMC@NLO
v2.7.2 framework. We focus on a final state of multiple dimuons, displaced up
to \mbox{7500 mm}, where the muons can be reconstructed without vertex
constraint using data from ATLAS and CMS detectors to be collected in Run~3.
Integrated luminosities of 137, 300, and 3000 fb$^{-1}$ for Run~2, Run~3, and
high luminosity run (HL-LHC), respectively, are used for estimating the
expected search sensitivity of the Large Hadron Collider to each of the decay
modes.
| [
{
"created": "Tue, 22 Nov 2022 20:39:50 GMT",
"version": "v1"
}
] | 2022-11-24 | [
[
"Elkafrawy",
"Tamer",
""
],
[
"Hohlmann",
"Marcus",
""
],
[
"Kamon",
"Teruki",
""
],
[
"Padley",
"Paul",
""
]
] | We investigate the potential reach of a search for a long-lived/prompt dark vector boson $Z_D$, also called dark $Z$, and a prompt dark Higgs boson $h_D$ through exotic decays of the observed Higgs boson $h$ into either $Z_DZ_D$, $h_Dh_D$, or $ZZ_D$ with $Z$ being the hypercharge gauge boson. The $Z_D$ production through the Higgs portal is completed via one of two mechanisms, kinetic mixing of $Z_D$ with $Z$ and the mixing of $h_D$ with $h$. All production modes of $h$ are considered, while the branching fractions are calculated in Monte Carlo simulation using the {\textsc{MadGraph5}}\_aMC@NLO v2.7.2 framework. We focus on a final state of multiple dimuons, displaced up to \mbox{7500 mm}, where the muons can be reconstructed without vertex constraint using data from ATLAS and CMS detectors to be collected in Run~3. Integrated luminosities of 137, 300, and 3000 fb$^{-1}$ for Run~2, Run~3, and high luminosity run (HL-LHC), respectively, are used for estimating the expected search sensitivity of the Large Hadron Collider to each of the decay modes. |
hep-ph/0111229 | Stefano Scopel | A. Bottino (1), F. Donato (2), N. Fornengo (1), S. Scopel (1) ((1)
Torino U./INFN, (2) LAPTH-Annecy) | Size of the neutralino--nucleon cross--section in the light of a new
determination of the pion--nucleon sigma term | 12 pages, 2 figures, typeset with ReVTeX | Astropart.Phys.18:205-211,2002 | 10.1016/S0927-6505(02)00107-X | DFTT 32/2001 | hep-ph astro-ph | null | We discuss the implications of a new determination of the pion-nucleon sigma
term for the evaluation of the neutralino-nucleon cross-section, and, in turn,
for detection rates for relic neutralinos in WIMP direct experiments and in
some of the indirect searches. It is shown that the new range for the
pion-nucleon sigma term, taken at its face value, favours values of the
neutralino-nucleon cross-sections which are sizeably larger than some of the
current estimates. Implications for neutralino cosmological properties are
derived.
| [
{
"created": "Mon, 19 Nov 2001 18:02:44 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Bottino",
"A.",
""
],
[
"Donato",
"F.",
""
],
[
"Fornengo",
"N.",
""
],
[
"Scopel",
"S.",
""
]
] | We discuss the implications of a new determination of the pion-nucleon sigma term for the evaluation of the neutralino-nucleon cross-section, and, in turn, for detection rates for relic neutralinos in WIMP direct experiments and in some of the indirect searches. It is shown that the new range for the pion-nucleon sigma term, taken at its face value, favours values of the neutralino-nucleon cross-sections which are sizeably larger than some of the current estimates. Implications for neutralino cosmological properties are derived. |
hep-ph/9607252 | null | Jan Bartelski and Stanislaw Tatur | On the flavour dependence of polarized sea in the nucleon | 12 pages, latex, 5 postscript figures | Z.Phys. C75 (1997) 477-481 | null | null | hep-ph | null | We performed a phenomenological fit in order to get quark parton polarized
distributions in the nucleon. All data on inclusive and semi-inclusive spin
asymmetries measured on nucleon targets were used. We present the results for
the flavour dependence of polarized sea inside a nucleon. An excellent
agreement between inclusive and semi-inclusive data on polarized structure
functions was found in our model.
| [
{
"created": "Sat, 6 Jul 1996 15:05:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bartelski",
"Jan",
""
],
[
"Tatur",
"Stanislaw",
""
]
] | We performed a phenomenological fit in order to get quark parton polarized distributions in the nucleon. All data on inclusive and semi-inclusive spin asymmetries measured on nucleon targets were used. We present the results for the flavour dependence of polarized sea inside a nucleon. An excellent agreement between inclusive and semi-inclusive data on polarized structure functions was found in our model. |
hep-ph/0302013 | Wally Melnitchouk | F.E. Close and W. Melnitchouk | Symmetry breaking and quark-hadron duality in structure functions | 30 pages, 9 figures, to appear in Phys. Rev. C | Phys.Rev.C68:035210,2003 | 10.1103/PhysRevC.68.035210 | OUTP-03-03P, JLAB-THY-01-28 | hep-ph hep-ex nucl-ex nucl-th | null | We identify conditions under which a summation over nucleon resonances can
yield, via quark-hadron duality, parton model results for electromagnetic and
neutrino structure functions at large x. While a summation over the lowest even
and odd parity multiplets is sufficient to achieve duality in the symmetric
quark model, a suppression of transitions to specific final states is required
for more realistic cases incorporating SU(6) breaking. We outline several
scenarios consistent with duality, discuss their implications for the high Q^2
behavior of transition form factors, and illustrate how they can expose the
patterns in the flavor-spin dependence of inter-quark forces.
| [
{
"created": "Mon, 3 Feb 2003 18:44:08 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2003 15:38:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Close",
"F. E.",
""
],
[
"Melnitchouk",
"W.",
""
]
] | We identify conditions under which a summation over nucleon resonances can yield, via quark-hadron duality, parton model results for electromagnetic and neutrino structure functions at large x. While a summation over the lowest even and odd parity multiplets is sufficient to achieve duality in the symmetric quark model, a suppression of transitions to specific final states is required for more realistic cases incorporating SU(6) breaking. We outline several scenarios consistent with duality, discuss their implications for the high Q^2 behavior of transition form factors, and illustrate how they can expose the patterns in the flavor-spin dependence of inter-quark forces. |
1812.08622 | Daniel Schwartl\"ander | Anna Kulesza, Leszek Motyka, Daniel Schwartl\"ander, Tomasz Stebel,
Vincent Theeuwes | Associated production of a top quark pair with a heavy electroweak gauge
boson at NLO+NNLL accuracy | 24 pages, 16 figures | null | 10.1140/epjc/s10052-019-6746-z | MS-TP-18-29 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform threshold resummation of soft gluon corrections to the total cross
sections and the invariant mass distributions for production of a top-antitop
quark pair associated with a heavy electroweak boson $V = W^+$, $W^-$ or $Z$ in
$pp$ collisions at the Large Hadron Collider. The resummation is carried out at
next-to-next-to-leading-logarithmic (NNLL) accuracy using the direct QCD Mellin
space technique in the three-particle invariant mass kinematics. It is found
that for the $t\bar t Z$ process the soft gluon resummation introduces
significant corrections to the next-to-leading order (NLO) results. For the
central scale equal to the $t\bar t Z$ invariant mass the corrections reach
nearly 30%. For this process, the dominant theoretical uncertainty of the cross
section due to the scale choice is significantly reduced at the NLO+NNLL level
with respect to the NLO results. The effects of resummation are found to be
less pronounced in the $t\bar t W^{\pm}$ case. The obtained results are
compared to recent measurements performed by CMS and ATLAS collaborations at
the LHC.
| [
{
"created": "Thu, 20 Dec 2018 15:02:53 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Kulesza",
"Anna",
""
],
[
"Motyka",
"Leszek",
""
],
[
"Schwartländer",
"Daniel",
""
],
[
"Stebel",
"Tomasz",
""
],
[
"Theeuwes",
"Vincent",
""
]
] | We perform threshold resummation of soft gluon corrections to the total cross sections and the invariant mass distributions for production of a top-antitop quark pair associated with a heavy electroweak boson $V = W^+$, $W^-$ or $Z$ in $pp$ collisions at the Large Hadron Collider. The resummation is carried out at next-to-next-to-leading-logarithmic (NNLL) accuracy using the direct QCD Mellin space technique in the three-particle invariant mass kinematics. It is found that for the $t\bar t Z$ process the soft gluon resummation introduces significant corrections to the next-to-leading order (NLO) results. For the central scale equal to the $t\bar t Z$ invariant mass the corrections reach nearly 30%. For this process, the dominant theoretical uncertainty of the cross section due to the scale choice is significantly reduced at the NLO+NNLL level with respect to the NLO results. The effects of resummation are found to be less pronounced in the $t\bar t W^{\pm}$ case. The obtained results are compared to recent measurements performed by CMS and ATLAS collaborations at the LHC. |
hep-ph/9909282 | Kin-Wang Ng | Da-Shin Lee (Dong Hwa University) and Kin-Wang Ng (Inst. of Physics,
Academia Sinica, Taiwan) | Photon Production of Axionic Cold Dark Matter | 17 pages, RevTex, including 5 ps figures | Phys.Rev. D61 (2000) 085003 | 10.1103/PhysRevD.61.085003 | null | hep-ph astro-ph | null | Using the non-equilibrium quantum field theory, photon production from the
coherently oscillating axion field in a flat Robertson-Walker cosmology is
re-examined. First neglecting the Debye screening of the baryon plasma to
photons, we find that the axions will dissipate into photons via spinodal
instability in addition to parametric resonance. As a result of the
pseudo-scalar nature of the axion-photon coupling, we observe a circular
polarization asymmetry in the produced photons. However, these effects are
suppressed to an insignificant level in the expanding universe. We then briefly
discuss a systematic way of including the plasma effect which can further
suppress the photon production. We note that the formalism of the problem can
be applied to any pseudo-scalar field coupled to photon in a thermal background
in a general curved spacetime.
| [
{
"created": "Wed, 8 Sep 1999 07:36:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lee",
"Da-Shin",
"",
"Dong Hwa University"
],
[
"Ng",
"Kin-Wang",
"",
"Inst. of Physics,\n Academia Sinica, Taiwan"
]
] | Using the non-equilibrium quantum field theory, photon production from the coherently oscillating axion field in a flat Robertson-Walker cosmology is re-examined. First neglecting the Debye screening of the baryon plasma to photons, we find that the axions will dissipate into photons via spinodal instability in addition to parametric resonance. As a result of the pseudo-scalar nature of the axion-photon coupling, we observe a circular polarization asymmetry in the produced photons. However, these effects are suppressed to an insignificant level in the expanding universe. We then briefly discuss a systematic way of including the plasma effect which can further suppress the photon production. We note that the formalism of the problem can be applied to any pseudo-scalar field coupled to photon in a thermal background in a general curved spacetime. |
2302.07365 | David d'Enterria | David d'Enterria and Hua-Sheng Shao | Prospects for ditauonium discovery at colliders | 15 pages, 6 figures. Minor mods. to match published version: Phys.
Lett. B 842 (2023) 137960 | null | 10.1016/j.physletb.2023.137960 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | The feasibility of observing ditauonium, the bound state of two tau leptons,
at $e^+e^-$ colliders (BES III at $\sqrt{s} = 3.78$ GeV, Belle II at $\sqrt{s}
= 10.6$ GeV, a future super tau-charm factory (STCF) at $\sqrt{s} \approx
2m_{\tau}$, and the FCC-ee at $\sqrt{s} = 91.2$ GeV) as well as in hadronic and
photon-photon collisions at the LHC, is studied. Cross sections and expected
yields for spin-0 para- ($\mathcal{T}_0$) and spin-1 ortho- ($\mathcal{T}_1$)
ditauonium are presented for nine different production and decay processes.
Para-ditauonium can be observed at the FCC-ee via photon fusion in its diphoton
decay ($\gamma\gamma\to\mathcal{T}_0\to\gamma\gamma$). Ortho-ditauonium can be
observed at STCF via $e^+e^-\to\mathcal{T}_1\to\mu^+\mu^-$, where a threshold
scan with monochromatized beams can also provide a very precise extraction of
the tau lepton mass with a $\mathcal{O}(25$ keV) uncertainty or less. Observing
pp $\to \mathcal{T}_1(\mu^+\mu^-)+X$ at the LHC is possible by identifying its
displaced vertex with a good control of the combinatorial dimuon background. In
addition, we compute the rare decay branching fractions of ditauonium into
quarkonium plus a photon.
| [
{
"created": "Tue, 14 Feb 2023 21:56:46 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2023 19:24:21 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"d'Enterria",
"David",
""
],
[
"Shao",
"Hua-Sheng",
""
]
] | The feasibility of observing ditauonium, the bound state of two tau leptons, at $e^+e^-$ colliders (BES III at $\sqrt{s} = 3.78$ GeV, Belle II at $\sqrt{s} = 10.6$ GeV, a future super tau-charm factory (STCF) at $\sqrt{s} \approx 2m_{\tau}$, and the FCC-ee at $\sqrt{s} = 91.2$ GeV) as well as in hadronic and photon-photon collisions at the LHC, is studied. Cross sections and expected yields for spin-0 para- ($\mathcal{T}_0$) and spin-1 ortho- ($\mathcal{T}_1$) ditauonium are presented for nine different production and decay processes. Para-ditauonium can be observed at the FCC-ee via photon fusion in its diphoton decay ($\gamma\gamma\to\mathcal{T}_0\to\gamma\gamma$). Ortho-ditauonium can be observed at STCF via $e^+e^-\to\mathcal{T}_1\to\mu^+\mu^-$, where a threshold scan with monochromatized beams can also provide a very precise extraction of the tau lepton mass with a $\mathcal{O}(25$ keV) uncertainty or less. Observing pp $\to \mathcal{T}_1(\mu^+\mu^-)+X$ at the LHC is possible by identifying its displaced vertex with a good control of the combinatorial dimuon background. In addition, we compute the rare decay branching fractions of ditauonium into quarkonium plus a photon. |
1708.04474 | Christoph Langenbruch | T. Hurth, C. Langenbruch, F. Mahmoudi | Direct determination of Wilson coefficients using $B^0\to
K^{*0}\mu^+\mu^-$ decays | 36 pages, 8 figures; v2: Negligible changes in numerics, references
added, matches published version | JHEP 11 (2017) 176 | 10.1007/JHEP11(2017)176 | CERN-TH-2017-178, MITP/17-053 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | A method to directly determine the Wilson coefficients for rare $b\to s$
transitions using $B^0\to K^{*0}\mu^+\mu^-$ decays in an unbinned maximum
likelihood fit is presented. The method has several advantages compared to the
conventional determination of the Wilson coefficients from angular observables
that are determined in bins of $q^2$, the square of the mass of the dimuon
system. The method uses all experimental information in an optimal way and
automatically accounts for experimental correlations. Performing
pseudoexperiments, we show the improved sensitivity of the proposed method for
the Wilson coefficients. We also demonstrate that it will be possible to use
the method with the combined Run 1 and 2 data sample taken by the LHCb
experiment.
| [
{
"created": "Tue, 15 Aug 2017 12:25:52 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2017 10:22:25 GMT",
"version": "v2"
}
] | 2017-11-30 | [
[
"Hurth",
"T.",
""
],
[
"Langenbruch",
"C.",
""
],
[
"Mahmoudi",
"F.",
""
]
] | A method to directly determine the Wilson coefficients for rare $b\to s$ transitions using $B^0\to K^{*0}\mu^+\mu^-$ decays in an unbinned maximum likelihood fit is presented. The method has several advantages compared to the conventional determination of the Wilson coefficients from angular observables that are determined in bins of $q^2$, the square of the mass of the dimuon system. The method uses all experimental information in an optimal way and automatically accounts for experimental correlations. Performing pseudoexperiments, we show the improved sensitivity of the proposed method for the Wilson coefficients. We also demonstrate that it will be possible to use the method with the combined Run 1 and 2 data sample taken by the LHCb experiment. |
2206.06564 | Antonio Enrique C\'arcamo Hern\'andez | V. V. Vien, H. N. Long, A. E. C\'arcamo Hern\'andez | Lepton masses and mixings, and muon anomalous magnetic moment in an
extended $B-L$ model with type I seesaw mechanism | Version accepted for publication in PTP | Progress of Theoretical and Experimental Physics, 2022, vol. 9,
(2022) 093B11 | 10.1093/ptep/ptac116 | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | We propose a $B-L$ model combined with the $S_4\times Z_3\times Z_4$ discrete
symmetry which successfully explains the recent $3+1$ sterile - active neutrino
data. The smallness of neutrino mass is obtained through the type-I seesaw
mechanism. The active-active and sterile-active neutrino mixing angles are
predicted to be consistent with the recent constraints in which $0.3401\,
(0.3402) \leq \sin^2\theta_{12}\leq 0.3415\, (0.3416), \, 0.456\, (0.433) \leq
\sin^2\theta_{23}\leq 0.544\, (0.545), \, 2.00\, (2.018) \leq 10^2\times
\sin^2\theta_{13}\leq 2.405\, (2.424),\,\, 156 \, (140.8) \leq
\delta^{(\circ)}_{CP}\leq 172\, (167.2)$ for normal (inverted) ordering of the
three neutrino scenario, and $0.015 \,(0.022) \leq s^2_{14}\leq 0.045
\,(0.029), \, 0.005 (0.0095)\leq s^2_{24}\leq 0.012\, (0.012), \, 0.003
\,(0.009)\leq s^2_{34} \leq 0.011$ for normal (inverted) ordering of the $3+1$
neutrino scenario. Our model predicts flavour conserving leptonic neutral
scalar interactions and successfully explains the muon $g-2$ anomaly.
| [
{
"created": "Tue, 14 Jun 2022 02:39:40 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2022 11:48:20 GMT",
"version": "v2"
}
] | 2022-09-28 | [
[
"Vien",
"V. V.",
""
],
[
"Long",
"H. N.",
""
],
[
"Hernández",
"A. E. Cárcamo",
""
]
] | We propose a $B-L$ model combined with the $S_4\times Z_3\times Z_4$ discrete symmetry which successfully explains the recent $3+1$ sterile - active neutrino data. The smallness of neutrino mass is obtained through the type-I seesaw mechanism. The active-active and sterile-active neutrino mixing angles are predicted to be consistent with the recent constraints in which $0.3401\, (0.3402) \leq \sin^2\theta_{12}\leq 0.3415\, (0.3416), \, 0.456\, (0.433) \leq \sin^2\theta_{23}\leq 0.544\, (0.545), \, 2.00\, (2.018) \leq 10^2\times \sin^2\theta_{13}\leq 2.405\, (2.424),\,\, 156 \, (140.8) \leq \delta^{(\circ)}_{CP}\leq 172\, (167.2)$ for normal (inverted) ordering of the three neutrino scenario, and $0.015 \,(0.022) \leq s^2_{14}\leq 0.045 \,(0.029), \, 0.005 (0.0095)\leq s^2_{24}\leq 0.012\, (0.012), \, 0.003 \,(0.009)\leq s^2_{34} \leq 0.011$ for normal (inverted) ordering of the $3+1$ neutrino scenario. Our model predicts flavour conserving leptonic neutral scalar interactions and successfully explains the muon $g-2$ anomaly. |
1605.00692 | Agustin Sabio Vera | Douglas A. Ross and Agustin Sabio Vera | The Effect of a Rapidity Gap Veto on the Discrete BFKL Pomeron | 10 pages, 3 figures | null | 10.1016/j.physletb.2016.07.025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the sensitivity of the discrete BFKL spectrum, which appears
in the gluon Green function when the running coupling is considered, to a lower
cut-off in the relative rapidities of the emitted particles. We find that the
eigenvalues associated to each of the discrete eigenfunctions decrease with the
size of the rapidity veto. The effect is stronger on the lowest eigenfunctions.
The net result is a reduction of the growth with energy for the Green function
together with a suppression in the regions with small transverse momentum.
| [
{
"created": "Mon, 2 May 2016 21:32:55 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Ross",
"Douglas A.",
""
],
[
"Vera",
"Agustin Sabio",
""
]
] | We investigate the sensitivity of the discrete BFKL spectrum, which appears in the gluon Green function when the running coupling is considered, to a lower cut-off in the relative rapidities of the emitted particles. We find that the eigenvalues associated to each of the discrete eigenfunctions decrease with the size of the rapidity veto. The effect is stronger on the lowest eigenfunctions. The net result is a reduction of the growth with energy for the Green function together with a suppression in the regions with small transverse momentum. |
1205.6434 | Francesco Riva Dr | Alex Pomarol and Francesco Riva | The Composite Higgs and Light Resonance Connection | Version to be published in JHEP | null | 10.1007/JHEP08(2012)135 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weinberg sum-rules have been used in the past to successfully predict the
electromagnetic contribution to the charged-pion mass as a function of the
meson masses. Following the same approach we calculate in the minimal composite
Higgs model (MCHM) the Higgs mass as a function of the fermionic resonance
masses. The simplicity of the method allows us to study several versions of the
MCHM and show that a Higgs with a mass around 125 GeV requires, quite
generically, fermionic resonances below the TeV, and therefore accessible at
the LHC. We also examine the couplings of the Higgs to the SM fermions and
calculate their deviation from the SM value.
| [
{
"created": "Tue, 29 May 2012 17:43:59 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Aug 2012 13:15:38 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Pomarol",
"Alex",
""
],
[
"Riva",
"Francesco",
""
]
] | Weinberg sum-rules have been used in the past to successfully predict the electromagnetic contribution to the charged-pion mass as a function of the meson masses. Following the same approach we calculate in the minimal composite Higgs model (MCHM) the Higgs mass as a function of the fermionic resonance masses. The simplicity of the method allows us to study several versions of the MCHM and show that a Higgs with a mass around 125 GeV requires, quite generically, fermionic resonances below the TeV, and therefore accessible at the LHC. We also examine the couplings of the Higgs to the SM fermions and calculate their deviation from the SM value. |
0712.3745 | Pietro Santorelli | Pietro Santorelli | On the eta(b) => J/psi J/psi decay | LaTeX, 5 pages, 2 figures. Contributed to QCD @ Work 2007:
International Workshop on Quantum Chromodynamics Theory and Experiment,
Martina Franca, Valle d'Itria, Italy, 16-20 Jun 2007 | AIP Conf.Proc.964:132-136,2007 | 10.1063/1.2823838 | NAPOLI-DSF-2007-30 | hep-ph | null | It has been argued long ago that eta(b) could be observed through the eta(b)
=> J/psi(=> mu+ mu-) J/psi(=> mu+ mu-) decay chain. Recent calculations
indicate that the width of eta(b) into two J/psi is almost three order of
magnitude smaller than the one into the D D*. We study the effects of final
state interactions due to the D D* intermediate state on the J/psi J/psi final
state. We find that the inclusion of this contribution may enhance the short
distance branching ratio of about two orders of magnitude.
| [
{
"created": "Fri, 21 Dec 2007 16:45:25 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Santorelli",
"Pietro",
""
]
] | It has been argued long ago that eta(b) could be observed through the eta(b) => J/psi(=> mu+ mu-) J/psi(=> mu+ mu-) decay chain. Recent calculations indicate that the width of eta(b) into two J/psi is almost three order of magnitude smaller than the one into the D D*. We study the effects of final state interactions due to the D D* intermediate state on the J/psi J/psi final state. We find that the inclusion of this contribution may enhance the short distance branching ratio of about two orders of magnitude. |
2308.16242 | Robert Wiley Deal | Robert Wiley Deal, Kishan Sankharva, Kuver Sinha, Scott Watson | Multi-component Dark Matter and Small Scale Structure Formation | 32 pages, 9 figures, references added | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We consider the evolution of non-thermal dark matter perturbations in models
which contain both Weakly Interacting Massive Particles (WIMPs) and axions.
Using constraints from existing observations we examine the percentage of WIMPs
and axions that may comprise the cosmological dark matter budget in models with
an Early Matter Dominated Epoch (EMDE) -- where entropy production is
important. After carefully tracking the thermal evolution of the various
species by solving the Boltzmann equations, we consider the enhancement of
perturbations that may have led to early structure formation for axions and
WIMPs. We investigate the impact of enhanced perturbations on the parameter
space of both species, after imposing existing constraints from indirect
detection experiments. Given these constraints we establish the feasibility of
axions to form miniclusters in the early universe in EMDEs for a given
percentage of allowed WIMPs. We find that EMDEs with low reheat temperatures
near the BBN limit are preferred for axion minicluster formation. When the EMDE
is caused by string moduli, the WIMP contribution to the relic density is set
by the moduli branching to dark matter at the level of $\lesssim
\mathcal{O}(10^{-4})$.
| [
{
"created": "Wed, 30 Aug 2023 18:00:33 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Oct 2023 17:00:33 GMT",
"version": "v2"
}
] | 2023-10-03 | [
[
"Deal",
"Robert Wiley",
""
],
[
"Sankharva",
"Kishan",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Watson",
"Scott",
""
]
] | We consider the evolution of non-thermal dark matter perturbations in models which contain both Weakly Interacting Massive Particles (WIMPs) and axions. Using constraints from existing observations we examine the percentage of WIMPs and axions that may comprise the cosmological dark matter budget in models with an Early Matter Dominated Epoch (EMDE) -- where entropy production is important. After carefully tracking the thermal evolution of the various species by solving the Boltzmann equations, we consider the enhancement of perturbations that may have led to early structure formation for axions and WIMPs. We investigate the impact of enhanced perturbations on the parameter space of both species, after imposing existing constraints from indirect detection experiments. Given these constraints we establish the feasibility of axions to form miniclusters in the early universe in EMDEs for a given percentage of allowed WIMPs. We find that EMDEs with low reheat temperatures near the BBN limit are preferred for axion minicluster formation. When the EMDE is caused by string moduli, the WIMP contribution to the relic density is set by the moduli branching to dark matter at the level of $\lesssim \mathcal{O}(10^{-4})$. |
1510.07397 | Guo-Li Wang | Tianhong Wang, Yue Jiang, Wan-Li Ju, Han Yuan, Guo-Li Wang | The Electromagnetic Decays of $B^{\pm}_c(2S)$ | 9 pages, 3 figures, 3 tables | JHEP 03 (2016) 209 | 10.1007/JHEP03(2016)209 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the electromagnetic (EM) decay widths of the $B^{\pm}_c(2S)$
meson, which is observed recently by the ATLAS Collaboration. The main EM decay
channels of this particle are $1{^3S_1}\gamma$ and $1{P}\gamma$, which, in
literature, are estimated to have the branching ratio of about $1/10$. In this
work, we get the partial decay widths: $\Gamma(2{^1S_0}\rightarrow
1{^3S_1}\gamma)=0.192$ keV, $\Gamma(2{^1S_0}\rightarrow 1{P_1}\gamma) = 2.24$
keV and $\Gamma(2{^1S_0}\rightarrow 1{P_1^\prime}\gamma) = 11.4$ keV. In the
calculation, the instantaneous approximated Bethe-Salpeter method is used. For
the $P$-wave $B_c$ mesons, the wave functions are given by mixing the $^3P_1$
and $^1P_1$ states. Within the Mandelstam formalism, the decay amplitude is
given, which includes the relativistic corrections.
| [
{
"created": "Mon, 26 Oct 2015 08:11:31 GMT",
"version": "v1"
}
] | 2021-11-05 | [
[
"Wang",
"Tianhong",
""
],
[
"Jiang",
"Yue",
""
],
[
"Ju",
"Wan-Li",
""
],
[
"Yuan",
"Han",
""
],
[
"Wang",
"Guo-Li",
""
]
] | We calculate the electromagnetic (EM) decay widths of the $B^{\pm}_c(2S)$ meson, which is observed recently by the ATLAS Collaboration. The main EM decay channels of this particle are $1{^3S_1}\gamma$ and $1{P}\gamma$, which, in literature, are estimated to have the branching ratio of about $1/10$. In this work, we get the partial decay widths: $\Gamma(2{^1S_0}\rightarrow 1{^3S_1}\gamma)=0.192$ keV, $\Gamma(2{^1S_0}\rightarrow 1{P_1}\gamma) = 2.24$ keV and $\Gamma(2{^1S_0}\rightarrow 1{P_1^\prime}\gamma) = 11.4$ keV. In the calculation, the instantaneous approximated Bethe-Salpeter method is used. For the $P$-wave $B_c$ mesons, the wave functions are given by mixing the $^3P_1$ and $^1P_1$ states. Within the Mandelstam formalism, the decay amplitude is given, which includes the relativistic corrections. |
0812.3161 | Thomas Schwetz | Michele Maltoni, Thomas Schwetz | Three-flavour neutrino oscillation update and comments on possible hints
for a non-zero theta_{13} | 8 pages, 3 figures, Talk by T. Schwetz at the idm2008 conference,
Aug. 18-22, 2008, Stockholm, Sweden | PoS idm2008:072,2008 | null | IFT-UAM/CSIC-08-92 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a short summary of three-flavour neutrino oscillation parameters
as determined from a global fit to 2008 data, and we comment on possible hints
in favour of a non-zero value of the mixing angle theta_{13} found in
arXiv:0806.2649. We do confirm a hint from solar + KamLAND data at about 1.5
sigma, which can be understood from the recent SNO CC/NC measurment. However,
we show that a claimed hint from atmospheric data is much less robust. It
depends on details of event rate calculations and treatment of theoretical
uncertainties. We could identify two data points showing an 'excess' (at the 1
sigma level) in the SK-I multi-GeV e-like data, which seem to be the origin of
the slight preference for theta_{13} > 0. We point out that once SK-I and SK-II
data are combined this 'excess' disappears, and irrespective of the details of
the analysis, no 'hint' from atmospheric data is obtained for the SK-I and
SK-II combined data set. As a result the global fit of all data leads to a best
fit value of theta_{13} consistent with zero within less than 1 sigma.
| [
{
"created": "Wed, 17 Dec 2008 14:02:48 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Maltoni",
"Michele",
""
],
[
"Schwetz",
"Thomas",
""
]
] | We provide a short summary of three-flavour neutrino oscillation parameters as determined from a global fit to 2008 data, and we comment on possible hints in favour of a non-zero value of the mixing angle theta_{13} found in arXiv:0806.2649. We do confirm a hint from solar + KamLAND data at about 1.5 sigma, which can be understood from the recent SNO CC/NC measurment. However, we show that a claimed hint from atmospheric data is much less robust. It depends on details of event rate calculations and treatment of theoretical uncertainties. We could identify two data points showing an 'excess' (at the 1 sigma level) in the SK-I multi-GeV e-like data, which seem to be the origin of the slight preference for theta_{13} > 0. We point out that once SK-I and SK-II data are combined this 'excess' disappears, and irrespective of the details of the analysis, no 'hint' from atmospheric data is obtained for the SK-I and SK-II combined data set. As a result the global fit of all data leads to a best fit value of theta_{13} consistent with zero within less than 1 sigma. |
1701.06810 | Yuming Wang | Yu-Ming Wang, Yan-Bing Wei, Yue-Long Shen, Cai-Dian L\"u | Perturbative corrections to $B \to D$ form factors in QCD | 49 pages, 8 figures, version accepted for publication in JHEP | null | 10.1007/JHEP06(2017)062 | UWTHPH 2016-29 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute perturbative QCD corrections to $B \to D$ form factors at leading
power in $\Lambda/m_b$, at large hadronic recoil, from the light-cone sum rules
(LCSR) with $B$-meson distribution amplitudes in HQET. QCD factorization for
the vacuum-to-$B$-meson correlation function with an interpolating current for
the $D$-meson is demonstrated explicitly at one loop with the power counting
scheme $m_c \sim {\cal O} \left (\sqrt{\Lambda \, m_b} \right ) $. The jet
functions encoding information of the hard-collinear dynamics in the
above-mentioned correlation function are complicated by the appearance of an
additional hard-collinear scale $m_c$, compared to the counterparts entering
the factorization formula of the vacuum-to-$B$-meson correction function for
the construction of $B \to \pi$ from factors. Inspecting the
next-to-leading-logarithmic sum rules for the form factors of $B \to D \ell
\nu$ indicates that perturbative corrections to the hard-collinear functions
are more profound than that for the hard functions, with the default theory
inputs, in the physical kinematic region. We further compute the subleading
power correction induced by the three-particle quark-gluon distribution
amplitudes of the $B$-meson at tree level employing the background gluon field
approach. The LCSR predictions for the semileptonic $B \to D \ell \nu$ form
factors are then extrapolated to the entire kinematic region with the
$z$-series parametrization. Phenomenological implications of our determinations
for the form factors $f_{BD}^{+, 0}(q^2)$ are explored by investigating the
(differential) branching fractions and the $R(D)$ ratio of $B \to D \ell \nu$
and by determining the CKM matrix element $|V_{cb}|$ from the total decay rate
of $B \to D \mu \nu_{\mu}$.
| [
{
"created": "Tue, 24 Jan 2017 11:07:04 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Jun 2017 22:38:32 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Wang",
"Yu-Ming",
""
],
[
"Wei",
"Yan-Bing",
""
],
[
"Shen",
"Yue-Long",
""
],
[
"Lü",
"Cai-Dian",
""
]
] | We compute perturbative QCD corrections to $B \to D$ form factors at leading power in $\Lambda/m_b$, at large hadronic recoil, from the light-cone sum rules (LCSR) with $B$-meson distribution amplitudes in HQET. QCD factorization for the vacuum-to-$B$-meson correlation function with an interpolating current for the $D$-meson is demonstrated explicitly at one loop with the power counting scheme $m_c \sim {\cal O} \left (\sqrt{\Lambda \, m_b} \right ) $. The jet functions encoding information of the hard-collinear dynamics in the above-mentioned correlation function are complicated by the appearance of an additional hard-collinear scale $m_c$, compared to the counterparts entering the factorization formula of the vacuum-to-$B$-meson correction function for the construction of $B \to \pi$ from factors. Inspecting the next-to-leading-logarithmic sum rules for the form factors of $B \to D \ell \nu$ indicates that perturbative corrections to the hard-collinear functions are more profound than that for the hard functions, with the default theory inputs, in the physical kinematic region. We further compute the subleading power correction induced by the three-particle quark-gluon distribution amplitudes of the $B$-meson at tree level employing the background gluon field approach. The LCSR predictions for the semileptonic $B \to D \ell \nu$ form factors are then extrapolated to the entire kinematic region with the $z$-series parametrization. Phenomenological implications of our determinations for the form factors $f_{BD}^{+, 0}(q^2)$ are explored by investigating the (differential) branching fractions and the $R(D)$ ratio of $B \to D \ell \nu$ and by determining the CKM matrix element $|V_{cb}|$ from the total decay rate of $B \to D \mu \nu_{\mu}$. |
0811.3671 | Yuri Markov Adolfovich | Yu.A. Markov, M.A. Markova, A.N. Vall | Nonlinear dynamics of soft fermion excitations in hot QCD plasma III:
Soft-quark bremsstrahlung and energy losses | 93 pages, 20 figures | Int.J.Mod.Phys.A25:685-776,2010 | 10.1142/S0217751X10047701 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general line with our early works [Yu.A. Markov, M.A. Markova, Nucl. Phys.
A770 (2006) 162; 784 (2007) 443] within the framework of a semiclassical
approximation the general theory of calculation of effective currents and
sources generating bremsstrahlung of an arbitrary number of soft quarks and
soft gluons at collision of a high-energy color-charged particle with thermal
partons in a hot quark-gluon plasma, is developed. For the case of one- and
two-scattering thermal partons with radiation of one or two soft excitations,
the effective currents and sources are calculated in an explicit form. In the
model case of `frozen' medium, approximate expressions for energy losses
induced by the most simple processes of bremsstrahlung of soft quark and soft
gluon, are derived. On the basis of a conception of the mutual cancellation of
singularities in the sum of so-called `diagonal' and `off-diagonal'
contributions to the energy losses, an effective method of determining color
factors in scattering probabilities, containing the initial values of Grassmann
color charges, is suggested. The dynamical equations for Grassmann color
charges of hard particle used by us early are proved to be insufficient for
investigation of the higher radiative processes. It is shown that for correct
description of these processes the given equations should be supplemented
successively with the higher-order terms in powers of the soft fermionic field.
| [
{
"created": "Sat, 22 Nov 2008 09:21:26 GMT",
"version": "v1"
}
] | 2010-03-02 | [
[
"Markov",
"Yu. A.",
""
],
[
"Markova",
"M. A.",
""
],
[
"Vall",
"A. N.",
""
]
] | In general line with our early works [Yu.A. Markov, M.A. Markova, Nucl. Phys. A770 (2006) 162; 784 (2007) 443] within the framework of a semiclassical approximation the general theory of calculation of effective currents and sources generating bremsstrahlung of an arbitrary number of soft quarks and soft gluons at collision of a high-energy color-charged particle with thermal partons in a hot quark-gluon plasma, is developed. For the case of one- and two-scattering thermal partons with radiation of one or two soft excitations, the effective currents and sources are calculated in an explicit form. In the model case of `frozen' medium, approximate expressions for energy losses induced by the most simple processes of bremsstrahlung of soft quark and soft gluon, are derived. On the basis of a conception of the mutual cancellation of singularities in the sum of so-called `diagonal' and `off-diagonal' contributions to the energy losses, an effective method of determining color factors in scattering probabilities, containing the initial values of Grassmann color charges, is suggested. The dynamical equations for Grassmann color charges of hard particle used by us early are proved to be insufficient for investigation of the higher radiative processes. It is shown that for correct description of these processes the given equations should be supplemented successively with the higher-order terms in powers of the soft fermionic field. |
1401.3709 | Antonino Di Piazza | Norman Neitz, Naveen Kumar, Felix Mackenroth, Karen Z. Hatsagortsyan,
Christoph H. Keitel, and Antonino Di Piazza | Novel aspects of radiation reaction in the classical and the quantum
regime | 13 pages, 3 figures, Proceedings of the LPHYS'13 Workshop | null | 10.1088/1742-6596/497/1/012015 | null | hep-ph physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is dedicated to the study of radiation reaction signatures in the
framework of classical and quantum electrodynamics. Since there has been no
distinct experimental validation of radiation reaction and its underlying
equations so far and its impact is expected to be substantial for the
construction of new experimental devices, e.g., quantum x-free electron lasers,
a profound understanding of radiation reaction effects is of special interest.
Here, we describe how the inclusion of quantum radiation reaction effects
changes the dynamics of ultra-relativistic electron beams colliding with
intense laser pulses significantly. Thereafter, the angular distribution of
emitted radiation is demonstrated to be strongly altered in the quantum
framework, if in addition to single photon emission also higher order photon
emissions are considered. Furthermore, stimulated Raman scattering of an
ultra-intense laser pulse in plasmas is examined and forward Raman scattering
is found to be significantly increased by the inclusion of radiation reaction
effects in the classical regime. The numerical simulations in this work show
the feasibility of an experimental verification of the predicted effects with
presently available lasers and electron accelerators.
| [
{
"created": "Mon, 13 Jan 2014 15:29:01 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Neitz",
"Norman",
""
],
[
"Kumar",
"Naveen",
""
],
[
"Mackenroth",
"Felix",
""
],
[
"Hatsagortsyan",
"Karen Z.",
""
],
[
"Keitel",
"Christoph H.",
""
],
[
"Di Piazza",
"Antonino",
""
]
] | This work is dedicated to the study of radiation reaction signatures in the framework of classical and quantum electrodynamics. Since there has been no distinct experimental validation of radiation reaction and its underlying equations so far and its impact is expected to be substantial for the construction of new experimental devices, e.g., quantum x-free electron lasers, a profound understanding of radiation reaction effects is of special interest. Here, we describe how the inclusion of quantum radiation reaction effects changes the dynamics of ultra-relativistic electron beams colliding with intense laser pulses significantly. Thereafter, the angular distribution of emitted radiation is demonstrated to be strongly altered in the quantum framework, if in addition to single photon emission also higher order photon emissions are considered. Furthermore, stimulated Raman scattering of an ultra-intense laser pulse in plasmas is examined and forward Raman scattering is found to be significantly increased by the inclusion of radiation reaction effects in the classical regime. The numerical simulations in this work show the feasibility of an experimental verification of the predicted effects with presently available lasers and electron accelerators. |
2010.06184 | Daijiro Suematsu | Daijiro Suematsu | Low scale leptogenesis in a model with promising $CP$ structure | 18 pages, 1 figure | null | 10.1140/epjc/s10052-021-09109-5 | KANAZAWA-20-08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a simple extension of the standard model, which could give a
solution to its $CP$ issues through both the Peccei-Quinn mechanism and the
Nelson-Barr mechanism. Its low energy effective model coincides with the
scotogenic model in the leptonic sector. Although leptogenesis is known not to
work well at lower reheating temperature than $10^9$ GeV in simple seesaw and
scotogenic frameworks, such low reheating temperature could be consistent with
both neutrino mass generation and thermal leptogenesis via newly introduced
fields without referring to the resonance effect. An alternative dark matter
candidate to axion is prepared as an indispensable ingredient of the model.
| [
{
"created": "Tue, 13 Oct 2020 05:21:34 GMT",
"version": "v1"
}
] | 2021-04-28 | [
[
"Suematsu",
"Daijiro",
""
]
] | We consider a simple extension of the standard model, which could give a solution to its $CP$ issues through both the Peccei-Quinn mechanism and the Nelson-Barr mechanism. Its low energy effective model coincides with the scotogenic model in the leptonic sector. Although leptogenesis is known not to work well at lower reheating temperature than $10^9$ GeV in simple seesaw and scotogenic frameworks, such low reheating temperature could be consistent with both neutrino mass generation and thermal leptogenesis via newly introduced fields without referring to the resonance effect. An alternative dark matter candidate to axion is prepared as an indispensable ingredient of the model. |
2404.04450 | Spencer Klein | Spencer R. Klein | Quantum mechanical aspects of coherent photoproduction: the limits of
coherence, and multiple vector mesons | Presented at the 1st International Workshop on the physics of Ultra
Peripheral Collisions (UPC 2023). 9 pages with 3 figures | null | null | null | hep-ph nucl-ex nucl-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | Quantum mechanics is central to coherent photoproduction in ultra-peripheral
collisions (UPCs). This writeup will discuss some surprising aspects of UPCs
that stem from these quantum mechanical roots. The Good-Walker (GW) paradigm,
which connects coherent photoproduction with the target nucleus remaining in
its ground state. This contrasts with a semi-classical picture, where coherence
depends on the positions of the individual nucleons and the momentum transfer.
Unlike the GW approach, the semiclassical picture is consistent with the
observed data on coherent photoproduction with nuclear breakup, and with
coherent photoproduction in peripheral collisions. The semiclassical approach
allows for a wider variety of coherent UPC reactions, such as coherent
photoproduction of charged mesons, including some non $q\overline q$ exotica.
Quantum mechanics is also key to the coherent photoproduction of multiple
vector mesons by the interactions of a single ion pair. The vector mesons share
a common impact parameter, and so can exhibit richer interference patterns than
single mesons. At forward rapidities, the cross sections to produce multiple
identical vector mesons are enhanced due to superradiance. With enough
statistics, multi-meson events may provide an opportunity to observe stimulated
decays.}
| [
{
"created": "Fri, 5 Apr 2024 23:37:45 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Klein",
"Spencer R.",
""
]
] | Quantum mechanics is central to coherent photoproduction in ultra-peripheral collisions (UPCs). This writeup will discuss some surprising aspects of UPCs that stem from these quantum mechanical roots. The Good-Walker (GW) paradigm, which connects coherent photoproduction with the target nucleus remaining in its ground state. This contrasts with a semi-classical picture, where coherence depends on the positions of the individual nucleons and the momentum transfer. Unlike the GW approach, the semiclassical picture is consistent with the observed data on coherent photoproduction with nuclear breakup, and with coherent photoproduction in peripheral collisions. The semiclassical approach allows for a wider variety of coherent UPC reactions, such as coherent photoproduction of charged mesons, including some non $q\overline q$ exotica. Quantum mechanics is also key to the coherent photoproduction of multiple vector mesons by the interactions of a single ion pair. The vector mesons share a common impact parameter, and so can exhibit richer interference patterns than single mesons. At forward rapidities, the cross sections to produce multiple identical vector mesons are enhanced due to superradiance. With enough statistics, multi-meson events may provide an opportunity to observe stimulated decays.} |
1606.05872 | Zhi-Gang Wang | Zhi-Gang Wang | Scalar tetraquark state candidates: $X(3915)$, $X(4500)$ and $X(4700)$ | 15 pages, 2 figures, correct some typing errors. arXiv admin note:
text overlap with arXiv:1502.04619, arXiv:1607.00701, arXiv:1312.1537 | Eur. Phys. J. C77 (2017) 78 | 10.1140/epjc/s10052-017-4640-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we tentatively assign the $X(3915)$ and $X(4500)$ to be the
ground state and the first radial excited state of the
axialvector-diquark-axialvector-antidiquark type scalar $cs\bar{c}\bar{s}$
tetraquark states, respectively, assign the $X(4700)$ to be the ground state
vector-diquark-vector-antidiquark type scalar $cs\bar{c}\bar{s}$ tetraquark
state, and study their masses and pole residues with the QCD sum rules in
details by calculating the contributions of the vacuum condensates up to
dimension 10. The numerical results support assigning the $X(3915)$ and
$X(4500)$ to be the ground state and the first radial excited state of the
axialvector-diquark-axialvector-antidiquark type scalar $cs\bar{c}\bar{s}$
tetraquark states, respectively, and assigning the $X(4700)$ to be the ground
state vector-diquark-vector-antidiquark type scalar $cs\bar{c}\bar{s}$
tetraquark state.
| [
{
"created": "Sun, 19 Jun 2016 14:11:25 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2016 01:12:17 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Sep 2016 12:21:03 GMT",
"version": "v3"
},
{
"created": "Thu, 13 Dec 2018 13:13:27 GMT",
"version": "v4"
}
] | 2018-12-17 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we tentatively assign the $X(3915)$ and $X(4500)$ to be the ground state and the first radial excited state of the axialvector-diquark-axialvector-antidiquark type scalar $cs\bar{c}\bar{s}$ tetraquark states, respectively, assign the $X(4700)$ to be the ground state vector-diquark-vector-antidiquark type scalar $cs\bar{c}\bar{s}$ tetraquark state, and study their masses and pole residues with the QCD sum rules in details by calculating the contributions of the vacuum condensates up to dimension 10. The numerical results support assigning the $X(3915)$ and $X(4500)$ to be the ground state and the first radial excited state of the axialvector-diquark-axialvector-antidiquark type scalar $cs\bar{c}\bar{s}$ tetraquark states, respectively, and assigning the $X(4700)$ to be the ground state vector-diquark-vector-antidiquark type scalar $cs\bar{c}\bar{s}$ tetraquark state. |
hep-ph/9508349 | Gustavo Burdman | Gustavo Burdman | Potential for Discoveries in Charm Meson Physics | 16 pages, LaTeX, 3 uuencoded figures | AIP Conf.Proc.349:409-424,1996 | 10.1063/1.49273 | FERMILAB-Conf-95/281-T | hep-ph | null | The possibility of using charm meson physics to test the Standard Model (SM)
is reviewed. In the case of $D^0-\bar{D}^0$ mixing, the SM contributions are
carefully considered and the existence of a window for the observation of new
physics is discussed. Some examples of extensions of the SM giving large mixing
signals are presented. Finally, some distinctive aspects of CP violation and
rare decays in charm mesons are discussed.
| [
{
"created": "Tue, 22 Aug 1995 22:06:47 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 1995 15:33:55 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Burdman",
"Gustavo",
""
]
] | The possibility of using charm meson physics to test the Standard Model (SM) is reviewed. In the case of $D^0-\bar{D}^0$ mixing, the SM contributions are carefully considered and the existence of a window for the observation of new physics is discussed. Some examples of extensions of the SM giving large mixing signals are presented. Finally, some distinctive aspects of CP violation and rare decays in charm mesons are discussed. |
hep-ph/9605391 | null | R. Kirschner | Perturbative Regge asymptotics in the case of non-vacuum exchange | Latex(7 pages), 1 figure not included | Nucl.Phys.Proc.Suppl. 51C (1996) 118-122 | 10.1016/S0920-5632(96)90015-8 | NTZ 24/96 | hep-ph | null | Some results on the perturbative Regge asymptotics are reviewed. The concepts
of the reggeon interaction approach and the double logarithmic approximation
are outlined. Contribution to the Zeuthen Workshop on QCD and QED at higher
order, Rheinsberg, April 1996.
| [
{
"created": "Fri, 24 May 1996 13:27:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kirschner",
"R.",
""
]
] | Some results on the perturbative Regge asymptotics are reviewed. The concepts of the reggeon interaction approach and the double logarithmic approximation are outlined. Contribution to the Zeuthen Workshop on QCD and QED at higher order, Rheinsberg, April 1996. |
hep-ph/9706520 | Nikolai Uraltsev | I. Bigi, R.David Dikeman and N. Uraltsev | The Hadronic Recoil Mass Spectrum in Semileptonic B Decays and
Extracting |V_{ub}| in a Model-Insensitive Way | 12 pages, 8 figures; plain LaTeX. Reported at 3rd BaBar Physics
Workshop, Orsay 16--19 June 1997 | Eur.Phys.J.C4:453-461,1998 | 10.1007/s100520050219 | TPI-MINN-97/21-T, UND-HEP-97-BIG04 | hep-ph | null | We present an extended discussion of the previously noted possibility to
extract |V_{ub}| from an analysis of the hadronic recoil mass spectrum in
B->X_u l nu decays. Invariant mass spectra containing perturbative as well as
nonperturbative corrections are given; their shape is manifestly sensitive to
the three basic quantities mu_pi^2, m_b, and alpha_s$, whereas the total
integrated rate is much less so. Only a small fraction of b->u transitions
generates a recoil mass M_X of at least M_D. We find that the fraction of
events with M_X < 1.5 GeV (to reject leakage from b->c) exhibits fairly little
dependence on mu_pi^2, m_b and alpha_s; |V_{ub}| can then be extracted in a
largely model-insensitive way. This conclusion is based on the applicability of
the OPE to actual semileptonic B decays. A direct cross-check of this
assumption and a determination of the required basic parameters of the heavy
quark expansion will be possible in the future with more experimental data.
| [
{
"created": "Thu, 26 Jun 1997 23:08:34 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jun 1997 00:09:51 GMT",
"version": "v2"
}
] | 2010-11-23 | [
[
"Bigi",
"I.",
""
],
[
"Dikeman",
"R. David",
""
],
[
"Uraltsev",
"N.",
""
]
] | We present an extended discussion of the previously noted possibility to extract |V_{ub}| from an analysis of the hadronic recoil mass spectrum in B->X_u l nu decays. Invariant mass spectra containing perturbative as well as nonperturbative corrections are given; their shape is manifestly sensitive to the three basic quantities mu_pi^2, m_b, and alpha_s$, whereas the total integrated rate is much less so. Only a small fraction of b->u transitions generates a recoil mass M_X of at least M_D. We find that the fraction of events with M_X < 1.5 GeV (to reject leakage from b->c) exhibits fairly little dependence on mu_pi^2, m_b and alpha_s; |V_{ub}| can then be extracted in a largely model-insensitive way. This conclusion is based on the applicability of the OPE to actual semileptonic B decays. A direct cross-check of this assumption and a determination of the required basic parameters of the heavy quark expansion will be possible in the future with more experimental data. |
1705.07691 | Jonathan Rosner | Marek Karliner and Jonathan L. Rosner | $J/\psi N$ photoproduction on deuterium as a test for exotic baryons | 5 pages, 2 figures. To be submitted to Physics Letters B | null | null | TAUP 3018/17, EFI 17-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend a previous study of photoproduction of exotic baryon resonances to
the reaction $\gamma + d \to J/\psi + n + p$, which permits simultaneous
investigation of the reactions $\gamma + p \to P_c^+ \to J/\psi~p$ \hbox{($n$
spectator)} and $\gamma + n \to P_c^0 \to J/\psi~n$ \hbox{($p$ spectator).}
Here $P_c^+$ is an exotic baryon with quark content $c \bar c uud$, and $P_c^0$
is its hypothetical isospin partner with quark content $c \bar c ddu$. We find:
\hbox{(1) The} cross section for $J/\psi~n$ photoproduction should be equal to
that for $J/\psi~p$ photoproduction if these processes are dominated by the
photon coupling to a $c\bar c$ pair. In that case the two processes are equal
by isospin reflection. (2) If a $P_c^+$ candidate is a genuine $c \bar c u u d$
resonance, its isospin partner $P_c^0 = c \bar c d d u$ should have the same
mass (again by isospin reflection). (3) In the absence of Fermi motion, the
cross section for photoproduction of $P_c$ off a deuteron should be nearly the
sum of two equal cross sections: $\sigma(\gamma p \to P_c^+)$ (spectator $n$)
and $\sigma(\gamma n \to P_c^0)$ (spectator $p$). (4) The effects of Fermi
motion are significant. They include smearing, form-factor suppression and
offshellness. The upshot is that the resonance is significantly wider and the
peak cross section off a deuteron is expected to be considerably less than
twice that in $\gamma p$.
| [
{
"created": "Mon, 22 May 2017 12:23:46 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2017 17:29:52 GMT",
"version": "v2"
}
] | 2017-05-30 | [
[
"Karliner",
"Marek",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | We extend a previous study of photoproduction of exotic baryon resonances to the reaction $\gamma + d \to J/\psi + n + p$, which permits simultaneous investigation of the reactions $\gamma + p \to P_c^+ \to J/\psi~p$ \hbox{($n$ spectator)} and $\gamma + n \to P_c^0 \to J/\psi~n$ \hbox{($p$ spectator).} Here $P_c^+$ is an exotic baryon with quark content $c \bar c uud$, and $P_c^0$ is its hypothetical isospin partner with quark content $c \bar c ddu$. We find: \hbox{(1) The} cross section for $J/\psi~n$ photoproduction should be equal to that for $J/\psi~p$ photoproduction if these processes are dominated by the photon coupling to a $c\bar c$ pair. In that case the two processes are equal by isospin reflection. (2) If a $P_c^+$ candidate is a genuine $c \bar c u u d$ resonance, its isospin partner $P_c^0 = c \bar c d d u$ should have the same mass (again by isospin reflection). (3) In the absence of Fermi motion, the cross section for photoproduction of $P_c$ off a deuteron should be nearly the sum of two equal cross sections: $\sigma(\gamma p \to P_c^+)$ (spectator $n$) and $\sigma(\gamma n \to P_c^0)$ (spectator $p$). (4) The effects of Fermi motion are significant. They include smearing, form-factor suppression and offshellness. The upshot is that the resonance is significantly wider and the peak cross section off a deuteron is expected to be considerably less than twice that in $\gamma p$. |
1611.00231 | Rupak Dutta | Rupak Dutta and Anupama Bhol | Model independent analysis of $b \to (c,\,u)\,\tau\nu$ leptonic and
semileptonic decays | 24 pages, 7 figures, typos corrected, references added | Phys. Rev. D 96, 036012 (2017) | 10.1103/PhysRevD.96.036012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Latest measurement of the ratio of branching ratios $R_D = \mathcal B(B \to
D\,\tau\,\nu)/\mathcal B(B \to D\,l\,\nu)$ and $R_{D^{\ast}} = \mathcal B(B \to
D^{\ast}\,\tau\,\nu)/\mathcal B(B \to D^{\ast}\,l\,\nu)$, where $l$ is either
an electron or muon, differs from the standard model expectation by $1.9\sigma$
and $3.3\sigma$, respectively. Similar tension has been observed in purely
leptonic $B \to \tau\nu$ decays as well. In this context, we consider the most
general effective Lagrangian in the presence of new physics and perform a model
independent analysis to explore various new physics couplings. Motivated by the
recently proposed new observables $R_D^{\tau} = R_D/\mathcal B(B \to \tau\nu)$
and $R_{D^{\ast}}^{\tau} = R_{D^{\ast}}/\mathcal B(B \to \tau\nu)$, we impose
$2\sigma$ constraints coming from $R_D^{\tau}$ and $R_{D^{\ast}}^{\tau}$ in
addition to the constraints coming from $R_D$, $R_{D^{\ast}}$, and $\mathcal
B(B \to \tau\nu)$ to constrain the new physics parameter space. We study the
impact of new physics on various observables related to $B_s \to
(D_s,\,D^{\ast}_s)\tau\nu$ and $B \to \pi\tau\nu$ decay processes.
| [
{
"created": "Tue, 1 Nov 2016 14:00:10 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 2016 12:46:47 GMT",
"version": "v2"
}
] | 2017-08-30 | [
[
"Dutta",
"Rupak",
""
],
[
"Bhol",
"Anupama",
""
]
] | Latest measurement of the ratio of branching ratios $R_D = \mathcal B(B \to D\,\tau\,\nu)/\mathcal B(B \to D\,l\,\nu)$ and $R_{D^{\ast}} = \mathcal B(B \to D^{\ast}\,\tau\,\nu)/\mathcal B(B \to D^{\ast}\,l\,\nu)$, where $l$ is either an electron or muon, differs from the standard model expectation by $1.9\sigma$ and $3.3\sigma$, respectively. Similar tension has been observed in purely leptonic $B \to \tau\nu$ decays as well. In this context, we consider the most general effective Lagrangian in the presence of new physics and perform a model independent analysis to explore various new physics couplings. Motivated by the recently proposed new observables $R_D^{\tau} = R_D/\mathcal B(B \to \tau\nu)$ and $R_{D^{\ast}}^{\tau} = R_{D^{\ast}}/\mathcal B(B \to \tau\nu)$, we impose $2\sigma$ constraints coming from $R_D^{\tau}$ and $R_{D^{\ast}}^{\tau}$ in addition to the constraints coming from $R_D$, $R_{D^{\ast}}$, and $\mathcal B(B \to \tau\nu)$ to constrain the new physics parameter space. We study the impact of new physics on various observables related to $B_s \to (D_s,\,D^{\ast}_s)\tau\nu$ and $B \to \pi\tau\nu$ decay processes. |
1403.4892 | Manoel R. Moldes | Manoel R. Calvo, Manoel R. Moldes, Carlos A. Salgado | Color coherence in a heavy quark antenna radiating gluons inside a QCD
medium | 12 pages | null | 10.1016/j.physletb.2014.10.010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the color coherence effects for soft gluon radiation off antennas
containing heavy quarks in the presence of a QCD medium - in color singlet,
triplet or octet global states. This work completes the studies of antenna
radiation inside a medium which provide a useful picture of the relevance of
interference effects in jet parton showers for the jet quenching phenomenon
observed in high-energy nuclear collisions. The analysis is performed resumming
the multiple scatterings of the partonic system with the medium. The main
conclusion is that decorrelation due to color rotation is more effective in the
case in which at least one of the emitters of the antenna is a heavy quark.
This effect, present both for a heavy-quark-antiquark or a heavy-quark-gluon
antenna is more relevant for the later or for the case in which the energies of
the quark and antiquark are very different. The parameter controlling these
effects involves the dead-cone angle. We find that interferences are cancelled,
spoiling the color correlation of the pair, when $\theta_{ DC}=M/E
>>1/\sqrt{\omega L}$ where E and {\omega} are the energies of the heavy quark
and the radiated gluon and L is the medium length. In the case of a
heavy-quark-antiquark antenna $t_{form}$ appears instead of L if the original
splitting is symmetric. The presence or absence of interferences modifies the
energy loss pattern.
| [
{
"created": "Wed, 19 Mar 2014 17:38:25 GMT",
"version": "v1"
}
] | 2014-10-15 | [
[
"Calvo",
"Manoel R.",
""
],
[
"Moldes",
"Manoel R.",
""
],
[
"Salgado",
"Carlos A.",
""
]
] | We compute the color coherence effects for soft gluon radiation off antennas containing heavy quarks in the presence of a QCD medium - in color singlet, triplet or octet global states. This work completes the studies of antenna radiation inside a medium which provide a useful picture of the relevance of interference effects in jet parton showers for the jet quenching phenomenon observed in high-energy nuclear collisions. The analysis is performed resumming the multiple scatterings of the partonic system with the medium. The main conclusion is that decorrelation due to color rotation is more effective in the case in which at least one of the emitters of the antenna is a heavy quark. This effect, present both for a heavy-quark-antiquark or a heavy-quark-gluon antenna is more relevant for the later or for the case in which the energies of the quark and antiquark are very different. The parameter controlling these effects involves the dead-cone angle. We find that interferences are cancelled, spoiling the color correlation of the pair, when $\theta_{ DC}=M/E >>1/\sqrt{\omega L}$ where E and {\omega} are the energies of the heavy quark and the radiated gluon and L is the medium length. In the case of a heavy-quark-antiquark antenna $t_{form}$ appears instead of L if the original splitting is symmetric. The presence or absence of interferences modifies the energy loss pattern. |
hep-ph/0605255 | Nicholas Harries | Sandhya Choubey, N. P. Harries, G.G. Ross | Probing neutrino oscillations from supernovae shock waves via the
IceCube detector | 30 pages, 15 figures, Version to appear in PRD | Phys.Rev.D74:053010,2006 | 10.1103/PhysRevD.74.053010 | null | hep-ph astro-ph hep-ex physics.ins-det | null | The time dependent neutrino oscillation signals due to the passage of a shock
wave through the supernovae are analyzed for the case of three active neutrinos
and also for the case that there are two additional sterile neutrinos. It is
shown that, even without flavour identification and energy measurement,
detailed information about the masses and mixing angles of the neutrinos may be
obtained with a detector with excellent time resolution such as IceCube. Such a
signal would also give important information about the nature of the shock wave
within the supernovae.
| [
{
"created": "Wed, 24 May 2006 12:08:18 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2006 13:42:04 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Sep 2006 17:56:14 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Choubey",
"Sandhya",
""
],
[
"Harries",
"N. P.",
""
],
[
"Ross",
"G. G.",
""
]
] | The time dependent neutrino oscillation signals due to the passage of a shock wave through the supernovae are analyzed for the case of three active neutrinos and also for the case that there are two additional sterile neutrinos. It is shown that, even without flavour identification and energy measurement, detailed information about the masses and mixing angles of the neutrinos may be obtained with a detector with excellent time resolution such as IceCube. Such a signal would also give important information about the nature of the shock wave within the supernovae. |
hep-ph/9709241 | Henryk Arodz | Henryk Arodz | Collective Dynamics of a Domain Wall - an Outline | Talk at NATO Advanced Research Workshop on Theoretical Physics: New
Developments in Quantuum Field Theory, Zakopane, Poland, 14-20 June 1997. 12
pp., no figures, LaTeX | null | null | null | hep-ph | null | We briefly outline the approach to extracting collective dynamics of a domain
wall from field equations which has been proposed by us in
Nucl.Phys.B450(1995)174-188 and further developed in hep-th/9703168.
| [
{
"created": "Thu, 4 Sep 1997 13:31:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arodz",
"Henryk",
""
]
] | We briefly outline the approach to extracting collective dynamics of a domain wall from field equations which has been proposed by us in Nucl.Phys.B450(1995)174-188 and further developed in hep-th/9703168. |
2205.00925 | Gustavo Gil da Silveira | G. Sampaio dos Santos, G. Gil da Silveira, M. V. T. Machado | $D$-meson production in high energy $pA$ collisions within the QCD color
dipole transverse momentum representation | 23 pages, 9 figures, 1 table | Eur.Phys.J. C 82 (2022) 795 | 10.1140/epjc/s10052-022-10771-6 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $D$-meson production is investigated by considering the unintegrated
gluon distribution within the dipole approach in the momentum representation.
We analyze the $D$-meson spectrum accounting for the effects of nonlinear
behavior of the QCD dynamics which can be accordingly addressed in the dipole
framework. The unintegrated gluon distribution is obtained by using geometric
scaling property and the results are compared to the Glauber-Gribov framework.
The absolute transverse momentum spectra and the nuclear modification ratios
are investigated. Predictions are compared with the experimental measurements
by the ALICE and LHCb Collaborations in $pA$ collisions for different rapidity
bins.
| [
{
"created": "Mon, 2 May 2022 14:08:43 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 02:55:53 GMT",
"version": "v2"
}
] | 2022-10-17 | [
[
"Santos",
"G. Sampaio dos",
""
],
[
"da Silveira",
"G. Gil",
""
],
[
"Machado",
"M. V. T.",
""
]
] | The $D$-meson production is investigated by considering the unintegrated gluon distribution within the dipole approach in the momentum representation. We analyze the $D$-meson spectrum accounting for the effects of nonlinear behavior of the QCD dynamics which can be accordingly addressed in the dipole framework. The unintegrated gluon distribution is obtained by using geometric scaling property and the results are compared to the Glauber-Gribov framework. The absolute transverse momentum spectra and the nuclear modification ratios are investigated. Predictions are compared with the experimental measurements by the ALICE and LHCb Collaborations in $pA$ collisions for different rapidity bins. |
1507.07922 | Doojin Kim | Doojin Kim, Jong-Chul Park | Energy peak: back to the Galactic Center GeV gamma-ray excess | 6 pages, 2 figures | Phys.Dark Univ. 11 (2016) 74-78 | null | CETUP2015-015 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel mechanism enabling us to have a continuum bump as a
signature of gamma-ray excess in indirect detection experiments of dark matter
(DM), postulating a generic dark sector having (at least) two DM candidates.
With the assumption of non-zero mass gap between the two DM candidates, the
heavier one directly communicates to the partner of the lighter one. Such a
partner then decays into a lighter DM particle along with an "axion-like"
particle (ALP) or dark "pion", which subsequently decays into a pair of
photons, via a more-than-one step cascade decay process. Since the cascade is
initiated by the dark partner obtaining a non-trivial fixed boost factor, a
continuum gamma-ray energy spectrum naturally arises even with a particle
directly decaying into two photons. We apply the main idea to the energy
spectrum of the GeV gamma-rays from around the Galactic Center (GC), and find
that the relevant observational data is well-reproduced by the theory
expectation predicted by the proposed mechanism. Remarkably, the relevant
energy spectrum has a robust peak at half the mass of the ALP or dark pion, as
opposed to popular DM models directly annihilating to Standard Model particles
where physical interpretations of the energy peak are not manifest. Our data
analysis reports substantially improved fits, compared to those annihilating DM
models, and ~900 MeV mass of the ALP or dark pion.
| [
{
"created": "Tue, 28 Jul 2015 20:00:28 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2016 19:05:56 GMT",
"version": "v2"
}
] | 2016-02-25 | [
[
"Kim",
"Doojin",
""
],
[
"Park",
"Jong-Chul",
""
]
] | We propose a novel mechanism enabling us to have a continuum bump as a signature of gamma-ray excess in indirect detection experiments of dark matter (DM), postulating a generic dark sector having (at least) two DM candidates. With the assumption of non-zero mass gap between the two DM candidates, the heavier one directly communicates to the partner of the lighter one. Such a partner then decays into a lighter DM particle along with an "axion-like" particle (ALP) or dark "pion", which subsequently decays into a pair of photons, via a more-than-one step cascade decay process. Since the cascade is initiated by the dark partner obtaining a non-trivial fixed boost factor, a continuum gamma-ray energy spectrum naturally arises even with a particle directly decaying into two photons. We apply the main idea to the energy spectrum of the GeV gamma-rays from around the Galactic Center (GC), and find that the relevant observational data is well-reproduced by the theory expectation predicted by the proposed mechanism. Remarkably, the relevant energy spectrum has a robust peak at half the mass of the ALP or dark pion, as opposed to popular DM models directly annihilating to Standard Model particles where physical interpretations of the energy peak are not manifest. Our data analysis reports substantially improved fits, compared to those annihilating DM models, and ~900 MeV mass of the ALP or dark pion. |
hep-ph/9707493 | Chris Quigg | Chris Quigg | Realizing the Potential of Quarkonium | 16 pages, 8 eps figures, uses aipproc and boxedeps. Symposium on
Twenty Beautiful Years of Bottom Physics, IIT, 29 June - 2 July 1997
Published version Published version | null | 10.1063/1.55117 | FERMILAB-CONF-97/266-T | hep-ph | null | I recall the development of quarkonium quantum mechanics after the discovery
of $\Upsilon$. I emphasize the empirical approach to determining the force
between quarks from the properties of $c\bar{c}$ and $b\bar{b}$ bound states. I
review the application of scaling laws, semiclassical methods, theorems and
near-theorems, and inverse-scattering techniques. I look forward to the next
quarkonium spectroscopy in the $B_{c}$ system.
| [
{
"created": "Mon, 28 Jul 1997 18:59:30 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 1998 23:37:41 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Quigg",
"Chris",
""
]
] | I recall the development of quarkonium quantum mechanics after the discovery of $\Upsilon$. I emphasize the empirical approach to determining the force between quarks from the properties of $c\bar{c}$ and $b\bar{b}$ bound states. I review the application of scaling laws, semiclassical methods, theorems and near-theorems, and inverse-scattering techniques. I look forward to the next quarkonium spectroscopy in the $B_{c}$ system. |
0804.3198 | Kwei-Chou Yang | Hisaki Hatanaka, Kwei-Chou Yang | $B \to K_1 \gamma$ Decays in the Light-Cone QCD Sum Rules | 19 pages, 3 figures, 2 tables, Eqs. (3.7), (5.14), Fig. 2, Table II
corrected | Phys.Rev.D77:094023,2008; Erratum-ibid.D78:059902,2008 | 10.1103/PhysRevD.77.094023 10.1103/PhysRevD.78.059902 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed study of $B\to K_1(1270) \gamma$ and $B\to K_1(1400)
\gamma$ decays. Using the light-cone sum rule technique, we calculate the $B\to
K_{1A} (1^3P_1)$ and $B\to K_{1B} (1^1P_1)$ tensor form factors,
$T_1^{K_{1A}}(0)$ and $T_1^{K_{1B}}(0)$, where the contributions are included
up to the first order in $m_{K_1}/m_b$. We resolve the sign ambiguity of the
$K_1(1270)$--$K_1(1400)$ mixing angle $\theta_{K_1}$ by defining the signs of
decay constants, $f_{K_{1A}}$ and $f_{K_{1B}}^\perp$. From the comparison of
the theoretical calculation and the data for decays $B\to K_1 \gamma$ and
$\tau^-\to K_1^-(1270)\nu_\tau$, we find that $\theta_{K_1}=-(34\pm 13)^\circ$
is favored. In contrast to $B\to K^* \gamma$, the hard-spectator contribution
suppresses the $B\to K_1(1270) \gamma$ and $B\to K_1(1400) \gamma$ branching
ratios slightly. The predicted branching ratios are in agreement with the Belle
measurement within the errors. We point out that a more precise measurement for
the ratio $R_{K_1}={\cal B}(B\to K_1(1400)\gamma)/{\cal B}(B\to
K_1(1270)\gamma)$ can offer a better determination for the $\theta_{K_1}$ and
consequently the theoretical uncertainties can be reduced.
| [
{
"created": "Sun, 20 Apr 2008 16:06:27 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Apr 2008 03:02:49 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jun 2008 15:03:27 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Sep 2008 11:00:53 GMT",
"version": "v4"
}
] | 2014-11-18 | [
[
"Hatanaka",
"Hisaki",
""
],
[
"Yang",
"Kwei-Chou",
""
]
] | We present a detailed study of $B\to K_1(1270) \gamma$ and $B\to K_1(1400) \gamma$ decays. Using the light-cone sum rule technique, we calculate the $B\to K_{1A} (1^3P_1)$ and $B\to K_{1B} (1^1P_1)$ tensor form factors, $T_1^{K_{1A}}(0)$ and $T_1^{K_{1B}}(0)$, where the contributions are included up to the first order in $m_{K_1}/m_b$. We resolve the sign ambiguity of the $K_1(1270)$--$K_1(1400)$ mixing angle $\theta_{K_1}$ by defining the signs of decay constants, $f_{K_{1A}}$ and $f_{K_{1B}}^\perp$. From the comparison of the theoretical calculation and the data for decays $B\to K_1 \gamma$ and $\tau^-\to K_1^-(1270)\nu_\tau$, we find that $\theta_{K_1}=-(34\pm 13)^\circ$ is favored. In contrast to $B\to K^* \gamma$, the hard-spectator contribution suppresses the $B\to K_1(1270) \gamma$ and $B\to K_1(1400) \gamma$ branching ratios slightly. The predicted branching ratios are in agreement with the Belle measurement within the errors. We point out that a more precise measurement for the ratio $R_{K_1}={\cal B}(B\to K_1(1400)\gamma)/{\cal B}(B\to K_1(1270)\gamma)$ can offer a better determination for the $\theta_{K_1}$ and consequently the theoretical uncertainties can be reduced. |
1311.7337 | Alberto Aparici | Alberto Aparici, Kyungwook Kim, Arcadi Santamaria and Jos\'e Wudka | Right-handed neutrino magnetic moments | Talk presented in the 16th International Symposium on particles,
strings and cosmology, PASCOS 2010 (Valencia, Spain) | J.Phys.Conf.Ser. 259 (2010) 012089 | 10.1088/0954-3899/37/7/075012 | FTUV-10-0722 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the most general dimension-five effective Lagrangian that can be
built using only Standard Model fields plus right-handed neutrinos, and find
that there exists a term that provides electroweak moments (i.e., couplings to
the Z and photon) for the right-handed neutrinos. Such term has not been
described previously in the literature. We discuss its phenomenology and the
bounds that can be derived from LEP results and from the observation of the
cooling process of red giants and supernovae.
| [
{
"created": "Thu, 28 Nov 2013 14:55:19 GMT",
"version": "v1"
}
] | 2013-12-02 | [
[
"Aparici",
"Alberto",
""
],
[
"Kim",
"Kyungwook",
""
],
[
"Santamaria",
"Arcadi",
""
],
[
"Wudka",
"José",
""
]
] | We consider the most general dimension-five effective Lagrangian that can be built using only Standard Model fields plus right-handed neutrinos, and find that there exists a term that provides electroweak moments (i.e., couplings to the Z and photon) for the right-handed neutrinos. Such term has not been described previously in the literature. We discuss its phenomenology and the bounds that can be derived from LEP results and from the observation of the cooling process of red giants and supernovae. |
hep-ph/9709432 | Heribert Weigert | Jamal Jalilian-Marian, Alex Kovner and Heribert Weigert | The Wilson renormalization group for low x physics: Gluon evolution at
finite parton density | 44 pages, LaTeX(2e), several ps figures included via epsfig; Various
misprints corrected. Simplified expressions for chi and sigma added (Eqs.
(5.57) to (5.60)) | Phys.Rev.D59:014015,1999 | 10.1103/PhysRevD.59.014015 | TPI--MINN--97/26, NUC--MINN--97/11--T, HEP--MINN--1607,
OUTP-97-45-P, Cavendish-HEP 97/15 | hep-ph | null | We derive the complete Wilson renormalization group equation which governs
the evolution of the gluon distribution and other gluonic observables at low
$x$ and arbitrary density.
| [
{
"created": "Tue, 23 Sep 1997 16:06:18 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 1998 09:29:40 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Jalilian-Marian",
"Jamal",
""
],
[
"Kovner",
"Alex",
""
],
[
"Weigert",
"Heribert",
""
]
] | We derive the complete Wilson renormalization group equation which governs the evolution of the gluon distribution and other gluonic observables at low $x$ and arbitrary density. |
hep-ph/9707461 | U. Meissner | Ulf-G. Mei{\ss}ner | Baryon chiral perturbation theory | 9 pp, LaTeX file, 3 figures (uses epsf), menu.sty appended,
introductory talk, Seventh International Symposium on Meson-Nucleon Physics
and the Structure of the Nucleon, Vancouver, Canada, July 28 - August 1, 1997 | PiN Newslett.13:7-15,1997 | null | KFA-IKP(TH)-1997-15 | hep-ph nucl-th | null | I review recent progress made in the description of pion-nucleon scattering,
the $\sigma$--term, the scalar form factor and the strangeness content of the
nucleon in the framework of heavy baryon chiral perturbation theory. Other
topics are single pion production by real and virtual photons as well as in
proton-proton collisions.
| [
{
"created": "Fri, 25 Jul 1997 11:23:29 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 1997 16:24:28 GMT",
"version": "v2"
}
] | 2011-04-15 | [
[
"Meißner",
"Ulf-G.",
""
]
] | I review recent progress made in the description of pion-nucleon scattering, the $\sigma$--term, the scalar form factor and the strangeness content of the nucleon in the framework of heavy baryon chiral perturbation theory. Other topics are single pion production by real and virtual photons as well as in proton-proton collisions. |
hep-ph/0609153 | Maxim Pospelov | Pavel Bolokhov, Maxim Pospelov, and Michael Romalis | Electric Dipole Moments as Probes of CPT Invariance | 4 pages, typos corrected | Phys.Rev.D78:057702,2008 | 10.1103/PhysRevD.78.057702 | UVIC-TH-06-10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electric dipole moments (EDMs) of elementary particles and atoms probe
violations of T and P symmetries and consequently of CP if CPT is an exact
symmetry. We point out that EDMs can also serve as sensitive probes of CPT-odd,
CP-even interactions, that are not constrained by any other existing
experiments. Analyzing models with spontaneously broken Lorentz invariance, we
calculate EDMs in terms of the leading CPT-odd operators to show that
experimental sensitivity probes the scale of CPT breaking as high as
10^{12}GeV.
| [
{
"created": "Fri, 15 Sep 2006 21:46:44 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2007 05:21:58 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2008 19:17:35 GMT",
"version": "v3"
}
] | 2009-01-09 | [
[
"Bolokhov",
"Pavel",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Romalis",
"Michael",
""
]
] | Electric dipole moments (EDMs) of elementary particles and atoms probe violations of T and P symmetries and consequently of CP if CPT is an exact symmetry. We point out that EDMs can also serve as sensitive probes of CPT-odd, CP-even interactions, that are not constrained by any other existing experiments. Analyzing models with spontaneously broken Lorentz invariance, we calculate EDMs in terms of the leading CPT-odd operators to show that experimental sensitivity probes the scale of CPT breaking as high as 10^{12}GeV. |
2110.15391 | Disha Bhatia | Shankha Banerjee, Genevi\`eve B\'elanger, Disha Bhatia, Benjamin Fuks
and Sreerup Raychaudhuri | Phenomenological analysis of multi-pseudoscalar mediated dark matter
models | matches the published version: JHEP 07 (2022) 111 | null | 10.1007/JHEP07(2022)111 | CERN-TH-2021-174 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Non-minimal simplified extensions of the Standard Model have gained
considerable currency in the context of dark matter searches at the LHC, since
they predict enhanced mono-Higgs and mono-$W/Z$ signatures over large parts of
the parameter space. However, these non-minimal models obviously lack the
simplicity and directness of the original simplified models, and are more
heavily dependent on the model assumptions. We propose to classify these models
generically on the basis of additional mediator(s) and dark matter particles.
As an example, we take up a scenario involving multiple pseudoscalar mediators,
and a single Dirac dark matter particle, the latter being a popular
introduction to ensure ultraviolet completion of theories with multiple
pseudoscalar fields. In the chosen scenario, we discuss the viable channels and
signatures of relevance at the future runs of the LHC. These are then compared
with the minimal simplified scenarios and distinguishing features are
pinpointed.
| [
{
"created": "Thu, 28 Oct 2021 18:19:43 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jul 2022 14:21:45 GMT",
"version": "v2"
}
] | 2022-08-10 | [
[
"Banerjee",
"Shankha",
""
],
[
"Bélanger",
"Geneviève",
""
],
[
"Bhatia",
"Disha",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Raychaudhuri",
"Sreerup",
""
]
] | Non-minimal simplified extensions of the Standard Model have gained considerable currency in the context of dark matter searches at the LHC, since they predict enhanced mono-Higgs and mono-$W/Z$ signatures over large parts of the parameter space. However, these non-minimal models obviously lack the simplicity and directness of the original simplified models, and are more heavily dependent on the model assumptions. We propose to classify these models generically on the basis of additional mediator(s) and dark matter particles. As an example, we take up a scenario involving multiple pseudoscalar mediators, and a single Dirac dark matter particle, the latter being a popular introduction to ensure ultraviolet completion of theories with multiple pseudoscalar fields. In the chosen scenario, we discuss the viable channels and signatures of relevance at the future runs of the LHC. These are then compared with the minimal simplified scenarios and distinguishing features are pinpointed. |
1205.2506 | Francisco Campanario | G.Bozzi, F.Campanario, C.Englert, M.Rauch, M.Spannoswky, D.Zeppenfeld | Precision Multiboson Phenomenology | To appear in the proceedings of Conference: C12-03-10 | null | null | DCPT/12/62, IPPP/12/31, FTUV-12-0511, KA-TP-18--2012, LPN12-051,
SFB/CPP-12-26 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present recent results in precision multiboson (+jet) phenomenology at the
LHC. Results for diboson + jet, triboson, and also for WAA + jet will be
discussed focusing on the impact of the perturbative corrections on the
expected phenomenology.
| [
{
"created": "Fri, 11 May 2012 12:58:57 GMT",
"version": "v1"
}
] | 2012-05-14 | [
[
"Bozzi",
"G.",
""
],
[
"Campanario",
"F.",
""
],
[
"Englert",
"C.",
""
],
[
"Rauch",
"M.",
""
],
[
"Spannoswky",
"M.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | We present recent results in precision multiboson (+jet) phenomenology at the LHC. Results for diboson + jet, triboson, and also for WAA + jet will be discussed focusing on the impact of the perturbative corrections on the expected phenomenology. |
hep-ph/9802401 | Thomas G. Rizzo | Thomas G. Rizzo | Failure of JoAnne's Global Fit to the Wilson Coefficients in Rare B
Decays: A Left-Right Model Example | 30 pages, 6 figures | Phys.Rev.D58:114014,1998 | 10.1103/PhysRevD.58.114014 | SLAC-PUB-7702 | hep-ph | null | In the Standard Model and many of its extensions, it is well known that all
of the observables associated with the rare decays $b\to s\gamma$ and $b\to
s\ell^+\ell^-$ can be expressed in terms of the three Wilson coefficients,
$C_{7L,9L,10L}(\mu \sim m_b)$, together with several universal kinematic
functions. In particular it has been shown that the numerical values of these
coefficients can be uniquely extracted by a three parameter global fit to data
obtainable at future $B$-factories given sufficient integrated luminosity. In
this paper we examine if such global fits are also sensitive to new operators
beyond those which correspond to the above coefficients, i.e., whether is it
possible that new operators can be of sufficient importance for the three
parameter fit to fail and for this to be experimentally observable. Using the
Left-Right Symmetric Model as an example of a scenario with an extended
operator basis, we demonstrate via Monte Carlo techniques that such a
possibility can indeed be realized. In some sense this potential failure of the
global fit approach can actually be one of its greatest successes in
identifying the existence of new physics.
| [
{
"created": "Mon, 23 Feb 1998 21:11:30 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Rizzo",
"Thomas G.",
""
]
] | In the Standard Model and many of its extensions, it is well known that all of the observables associated with the rare decays $b\to s\gamma$ and $b\to s\ell^+\ell^-$ can be expressed in terms of the three Wilson coefficients, $C_{7L,9L,10L}(\mu \sim m_b)$, together with several universal kinematic functions. In particular it has been shown that the numerical values of these coefficients can be uniquely extracted by a three parameter global fit to data obtainable at future $B$-factories given sufficient integrated luminosity. In this paper we examine if such global fits are also sensitive to new operators beyond those which correspond to the above coefficients, i.e., whether is it possible that new operators can be of sufficient importance for the three parameter fit to fail and for this to be experimentally observable. Using the Left-Right Symmetric Model as an example of a scenario with an extended operator basis, we demonstrate via Monte Carlo techniques that such a possibility can indeed be realized. In some sense this potential failure of the global fit approach can actually be one of its greatest successes in identifying the existence of new physics. |
0710.0331 | Massimo Mannarelli | Massimo Mannarelli, Krishna Rajagopal and Rishi Sharma | The strength of crystalline color superconductors | 8 pages, proceedings of QCD@work 2007 International Workshop on QCD
Theory and Experiment- Martina Franca (Italy), June 2007 | AIPConf.Proc.964:264-271,2007 | 10.1063/1.2823861 | null | hep-ph astro-ph cond-mat.supr-con gr-qc nucl-th | null | We present a study of the shear modulus of the crystalline color
superconducting phase of quark matter, showing that this phase of dense, but
not asymptotically dense, quark matter responds to shear stress as a very rigid
solid. This phase is characterized by a gap parameter $\Delta$ that is
periodically modulated in space and therefore spontaneously breaks
translational invariance. We derive the effective action for the phonon fields
that describe space- and time-dependent fluctuations of the crystal structure
formed by $\Delta$, and obtain the shear modulus from the coefficients of the
spatial derivative terms. Within a Ginzburg-Landau approximation, we find shear
moduli which are 20 to 1000 times larger than those of neutron star crusts.
This phase of matter is thus more rigid than any known material in the
universe, but at the same time the crystalline color superconducting phase is
also superfluid. These properties raise the possibility that the presence of
this phase within neutron stars may have distinct implications for their
phenomenology. For example, (some) pulsar glitches may originate in crystalline
superconducting neutron star cores.
| [
{
"created": "Mon, 1 Oct 2007 17:02:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mannarelli",
"Massimo",
""
],
[
"Rajagopal",
"Krishna",
""
],
[
"Sharma",
"Rishi",
""
]
] | We present a study of the shear modulus of the crystalline color superconducting phase of quark matter, showing that this phase of dense, but not asymptotically dense, quark matter responds to shear stress as a very rigid solid. This phase is characterized by a gap parameter $\Delta$ that is periodically modulated in space and therefore spontaneously breaks translational invariance. We derive the effective action for the phonon fields that describe space- and time-dependent fluctuations of the crystal structure formed by $\Delta$, and obtain the shear modulus from the coefficients of the spatial derivative terms. Within a Ginzburg-Landau approximation, we find shear moduli which are 20 to 1000 times larger than those of neutron star crusts. This phase of matter is thus more rigid than any known material in the universe, but at the same time the crystalline color superconducting phase is also superfluid. These properties raise the possibility that the presence of this phase within neutron stars may have distinct implications for their phenomenology. For example, (some) pulsar glitches may originate in crystalline superconducting neutron star cores. |
hep-ph/0611354 | Daniele Binosi | Daniele Binosi and Joannis Papavassiliou | Pinch Technique for Schwinger-Dyson equations | 43 pages, 11 figures; title and abstract slightly modified, several
clarifying discussions added; final version to match the one accpted for
publication in JHEP | JHEP 0703:041,2007 | 10.1088/1126-6708/2007/03/041 | ECT*-06-20, FTUV-2006-1127 | hep-ph | null | In the context of scalar QED we derive the pinch technique self-energies and
vertices directly from the Schwinger-Dyson equations. After reviewing the
perturbative construction, we discuss in detail the general methodology and the
basic field-theoretic ingredients necessary for the completion of this task.
The construction requires the simultaneous treatment of the equations governing
the scalar self-energy and the fundamental interaction vertices. The resulting
non-trivial rearrangement of terms generates dynamically the Schwinger-Dyson
equations for the corresponding Green's functions of the background field
method. The proof relies on the extensive use of the all-order Ward-identities
satisfied by the full vertices of the theory and by the
one-particle-irreducible kernels appearing in the usual skeleton expansion. The
Ward identities for these latter quantities are derived formally, and several
subtleties related to the structure of the multiparticle kernels are addressed.
The general strategy for the generalization of the method in a non-Abelian
context is briefly outlined, and some of the technical difficulties are
discussed.
| [
{
"created": "Tue, 28 Nov 2006 15:39:35 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2007 09:02:17 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Binosi",
"Daniele",
""
],
[
"Papavassiliou",
"Joannis",
""
]
] | In the context of scalar QED we derive the pinch technique self-energies and vertices directly from the Schwinger-Dyson equations. After reviewing the perturbative construction, we discuss in detail the general methodology and the basic field-theoretic ingredients necessary for the completion of this task. The construction requires the simultaneous treatment of the equations governing the scalar self-energy and the fundamental interaction vertices. The resulting non-trivial rearrangement of terms generates dynamically the Schwinger-Dyson equations for the corresponding Green's functions of the background field method. The proof relies on the extensive use of the all-order Ward-identities satisfied by the full vertices of the theory and by the one-particle-irreducible kernels appearing in the usual skeleton expansion. The Ward identities for these latter quantities are derived formally, and several subtleties related to the structure of the multiparticle kernels are addressed. The general strategy for the generalization of the method in a non-Abelian context is briefly outlined, and some of the technical difficulties are discussed. |
1712.01298 | David London | Anirban Karan, Abinash Kumar Nayak, Rahul Sinha and David London | Using time-dependent indirect $CP$ asymmetries to measure $T$ and $CPT$
violation in $B^0$-${\bar B}^0$ mixing | 10 pages, no figures, changes: removed almost all discussion of what
can and cannot be done with the method of entangled states; explained that
CPT- and T-violating parameters also contribute to CP-violating effects;
reorganized the presentation of the paper; added footnotes and references | null | 10.1016/j.physletb.2018.04.029 | IMSc/2017/12/10, UdeM-GPP-TH-17-260 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum field theory, which is the basis for all of particle physics,
requires that all processes respect $CPT$ invariance. It is therefore of
paramount importance to test the validity of $CPT$ conservation. In this
Letter, we show that the time-dependent, indirect $CP$ asymmetries involving
$B$ decays to a $CP$ eigenstate contain enough information to measure $T$ and
$CPT$ violation in $B^0$-${\bar B}^0$ mixing, in addition to the standard
$CP$-violating weak phases. Entangled $B^0{\bar B}^0$ states are not required
(so that this analysis can be carried out at LHCb, as well as at the $B$
factories), penguin pollution need not be neglected, and the measurements can
be made even if the $B^0$-${\bar B}^0$ width difference vanishes.
| [
{
"created": "Mon, 4 Dec 2017 19:00:44 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2017 01:58:57 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Dec 2017 03:08:24 GMT",
"version": "v3"
},
{
"created": "Tue, 17 Apr 2018 17:13:00 GMT",
"version": "v4"
}
] | 2018-05-23 | [
[
"Karan",
"Anirban",
""
],
[
"Nayak",
"Abinash Kumar",
""
],
[
"Sinha",
"Rahul",
""
],
[
"London",
"David",
""
]
] | Quantum field theory, which is the basis for all of particle physics, requires that all processes respect $CPT$ invariance. It is therefore of paramount importance to test the validity of $CPT$ conservation. In this Letter, we show that the time-dependent, indirect $CP$ asymmetries involving $B$ decays to a $CP$ eigenstate contain enough information to measure $T$ and $CPT$ violation in $B^0$-${\bar B}^0$ mixing, in addition to the standard $CP$-violating weak phases. Entangled $B^0{\bar B}^0$ states are not required (so that this analysis can be carried out at LHCb, as well as at the $B$ factories), penguin pollution need not be neglected, and the measurements can be made even if the $B^0$-${\bar B}^0$ width difference vanishes. |
2211.04348 | Sonali Patnaik Dr. | Sonali Patnaik, Rajeev Singh | A Light shed on Lepton Flavor Universality in B decays | Updated, revised, and journal version. This article belongs to the
Special Issue Search for New Physics at the LHC and Future Colliders | Universe 2023, 9(3), 129 | 10.3390/universe9030129 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | At the back of succeeding measurements of anomalies in semileptonic decays at
LHCb and several collider experiments hinting at the possible violation of
lepton flavor universality, we undertake a concise review of theoretical
foundations of the tree- and loop-level $b$-hadron decays, $b \to c l \nu_l$
and $b \to s l^+ l^-$ along with experimental environments. We revisit the
world averages for $R_{D(D^*)}$, $R_{K(K^*)}$, $R_{J/\psi}$, and $R_{\eta_c}$,
for the semileptonic transitions and provide results within the framework of
the relativistic independent quark model in addition to the results from
model-independent studies. If the ongoing evaluation of the data of LHC Run 2
confirms the measurements of Run 1, then the statistical significance of the
effect in each decay channel is likely to reach 5~$\sigma$. A confirmation of
these measurements would soon turn out to be the first remarkable observation
of physics beyond the Standard Model providing a wider outlook on the
understanding of New Physics.
| [
{
"created": "Tue, 8 Nov 2022 16:13:08 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 2023 01:29:18 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Patnaik",
"Sonali",
""
],
[
"Singh",
"Rajeev",
""
]
] | At the back of succeeding measurements of anomalies in semileptonic decays at LHCb and several collider experiments hinting at the possible violation of lepton flavor universality, we undertake a concise review of theoretical foundations of the tree- and loop-level $b$-hadron decays, $b \to c l \nu_l$ and $b \to s l^+ l^-$ along with experimental environments. We revisit the world averages for $R_{D(D^*)}$, $R_{K(K^*)}$, $R_{J/\psi}$, and $R_{\eta_c}$, for the semileptonic transitions and provide results within the framework of the relativistic independent quark model in addition to the results from model-independent studies. If the ongoing evaluation of the data of LHC Run 2 confirms the measurements of Run 1, then the statistical significance of the effect in each decay channel is likely to reach 5~$\sigma$. A confirmation of these measurements would soon turn out to be the first remarkable observation of physics beyond the Standard Model providing a wider outlook on the understanding of New Physics. |
hep-ph/9506377 | null | Yu-Qi Chen and Robert J. Oakes | The Hyperfine Spin Splittings In Heavy Quarkonia | 17 pages | Phys.Rev.D53:5051-5057,1996 | 10.1103/PhysRevD.53.5051 | NUHEPTH-95-05 | hep-ph | null | The hyperfine spin splittings in heavy quarkonia are studied using the
recently developed renormalization group improved spin-spin potential which is
independent of the scale parameter $\mu$. The calculated energy difference
between the $J/\psi$ and the $\eta_c$ fits the experimental data well, while
the predicted energy difference $\Delta M_p$ between the center of the gravity
of $1^3P_{0,1,2}$ states and the $1^1P_1$ state of charmonium has the correct
sign but is somewhat larger than the experimental data. This is not surprising
since there are several other contributions to $\Delta M_p$, which we discuss,
that are of comparable size ($\sim 1$ MeV) that should be included, before
precise agreement with the data can be expected. The mass differences of the
$\psi'-\eta_c'$, $\Upsilon(1S)-\eta_b$, $\Upsilon(2S)-\eta_b'$, and $B_c^*-B_c$
are also predicted.
| [
{
"created": "Tue, 20 Jun 1995 18:27:04 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Chen",
"Yu-Qi",
""
],
[
"Oakes",
"Robert J.",
""
]
] | The hyperfine spin splittings in heavy quarkonia are studied using the recently developed renormalization group improved spin-spin potential which is independent of the scale parameter $\mu$. The calculated energy difference between the $J/\psi$ and the $\eta_c$ fits the experimental data well, while the predicted energy difference $\Delta M_p$ between the center of the gravity of $1^3P_{0,1,2}$ states and the $1^1P_1$ state of charmonium has the correct sign but is somewhat larger than the experimental data. This is not surprising since there are several other contributions to $\Delta M_p$, which we discuss, that are of comparable size ($\sim 1$ MeV) that should be included, before precise agreement with the data can be expected. The mass differences of the $\psi'-\eta_c'$, $\Upsilon(1S)-\eta_b$, $\Upsilon(2S)-\eta_b'$, and $B_c^*-B_c$ are also predicted. |
hep-ph/9505349 | Cliff Burgess | C. P. Burgess | SCALAR-EMITTING MODES IN DOUBLE-BETA DECAY | LaTeX(worldsci.sty, epsf), 20 pages, 3 figures included | null | null | McGill-95/13 | hep-ph | null | The sum-energy spectrum of electrons emitted in double-beta decay is a
well-known diagnostic for the nature of the physics which is responsible for
the decay. Three types of spectra are usually considered when these experiments
are analysed: one each for the standard two-neutrino decay, the neutrinoless
process and a scalar-emitting decay. It has recently been shown that two other
electron spectra can be possible for scalar-emitting modes, in addition to
these traditional three. One of these is softer than the Standard-Model
two-neutrino decay, while the other is intermediate between this and the usual
majoron-emitting spectrum. The models which predict these new spectra are
generically more natural than those which predict the traditional
majoron-emitting spectrum, in that they can accomodate the constraints
following from the steadily improving limits on neutrinoless decay without
requiring the fine-tuning that is endemic to the usual models. This article
reviews the properties of the physics which can produce the new kinds of
electron spectra. (Invited Talk presented to the Workshop on Double Beta Decay
and Related Topics, Trento Italy, April 1995.)
| [
{
"created": "Fri, 19 May 1995 19:27:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burgess",
"C. P.",
""
]
] | The sum-energy spectrum of electrons emitted in double-beta decay is a well-known diagnostic for the nature of the physics which is responsible for the decay. Three types of spectra are usually considered when these experiments are analysed: one each for the standard two-neutrino decay, the neutrinoless process and a scalar-emitting decay. It has recently been shown that two other electron spectra can be possible for scalar-emitting modes, in addition to these traditional three. One of these is softer than the Standard-Model two-neutrino decay, while the other is intermediate between this and the usual majoron-emitting spectrum. The models which predict these new spectra are generically more natural than those which predict the traditional majoron-emitting spectrum, in that they can accomodate the constraints following from the steadily improving limits on neutrinoless decay without requiring the fine-tuning that is endemic to the usual models. This article reviews the properties of the physics which can produce the new kinds of electron spectra. (Invited Talk presented to the Workshop on Double Beta Decay and Related Topics, Trento Italy, April 1995.) |
1606.02244 | Gustav Mogull | Simon Badger, Gustav Mogull, Tiziano Peraro | Local integrands for two-loop all-plus Yang-Mills amplitudes | 24 pages + refs + ancillary file; v3 published version | null | 10.1007/JHEP08(2016)063 | Edinburgh 2016/09 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We express the planar five- and six-gluon two-loop Yang-Mills amplitudes with
all positive helicities in compact analytic form using D-dimensional local
integrands that are free of spurious singularities. The integrand is fixed from
on-shell tree amplitudes in six dimensions using D-dimensional generalised
unitarity cuts. The resulting expressions are shown to have manifest infrared
behaviour at the integrand level. We also find simple representations of the
rational terms obtained after integration in 4-2epsilon dimensions.
| [
{
"created": "Tue, 7 Jun 2016 18:25:39 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2016 11:19:30 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Aug 2016 08:47:24 GMT",
"version": "v3"
}
] | 2016-09-21 | [
[
"Badger",
"Simon",
""
],
[
"Mogull",
"Gustav",
""
],
[
"Peraro",
"Tiziano",
""
]
] | We express the planar five- and six-gluon two-loop Yang-Mills amplitudes with all positive helicities in compact analytic form using D-dimensional local integrands that are free of spurious singularities. The integrand is fixed from on-shell tree amplitudes in six dimensions using D-dimensional generalised unitarity cuts. The resulting expressions are shown to have manifest infrared behaviour at the integrand level. We also find simple representations of the rational terms obtained after integration in 4-2epsilon dimensions. |
0706.2117 | Kazuhiro Tanaka | Yuji Koike (Niigata University), Kazuhiro Tanaka (Juntendo University) | Novel Master Formula for Twist-3 Soft-Gluon-Pole Mechanism to Single
Transverse-Spin Asymmetry | 4 pages, 4 eps figures. To appear in the proceedings of 15th
International Workshop on Deep-Inelastic Scattering and Related Subjects
(DIS2007), Munich, Germany, 16-20 Apr 2007 | null | 10.1016/j.physletb.2008.09.026 | null | hep-ph | null | We prove that twist-3 soft-gluon-pole (SGP) cross section for single spin
asymmetries is determined by a certain ``primordial'' twist-2 cross section up
to kinematic and color factors in the leading order perturbative QCD. This
unveils universal structure behind the SGP cross sections in a variety of hard
processes, and also the special role of the scale invariance in the
corresponding primordial cross section, which leads to remarkable
simplification of the SGP cross sections for the production of massless
particle, such as those for pion production p^\uparrow p \to \pi X and
direct-photon production p^\uparrow p \to \gamma X.
| [
{
"created": "Thu, 14 Jun 2007 13:17:57 GMT",
"version": "v1"
}
] | 2015-06-30 | [
[
"Koike",
"Yuji",
"",
"Niigata University"
],
[
"Tanaka",
"Kazuhiro",
"",
"Juntendo University"
]
] | We prove that twist-3 soft-gluon-pole (SGP) cross section for single spin asymmetries is determined by a certain ``primordial'' twist-2 cross section up to kinematic and color factors in the leading order perturbative QCD. This unveils universal structure behind the SGP cross sections in a variety of hard processes, and also the special role of the scale invariance in the corresponding primordial cross section, which leads to remarkable simplification of the SGP cross sections for the production of massless particle, such as those for pion production p^\uparrow p \to \pi X and direct-photon production p^\uparrow p \to \gamma X. |
1812.00919 | Bhavesh Chauhan | Bhavesh Chauhan, Subhendra Mohanty | Leptoquark solution for both the flavor and ANITA anomalies | matches version accepted in Phys.Rev.D | Phys. Rev. D 99, 095018 (2019) | 10.1103/PhysRevD.99.095018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ANITA experiment has seen anomalous Earth emergent showers of EeV
energies which cannot be explained with Standard Model interactions. In
addition, tests of lepton flavor universality in $ R(D^{(\ast)})$ and
$R(K^{(\ast)})$ have shown significant deviations from theoretical predictions.
It is known that, among single leptoquark solutions, only the chiral vector
leptoquark $U_1 \sim (\mathbf{3}, \mathbf{1} , 2/3)$ can simultaneously address
the discrepancies. In this paper, we show that the leptoquark motivated by
flavor anomalies coupled to a sterile neutrino can also explain the ANITA
Anomalous Events. We consider two scenarios, (a) the sterile neutrino, produced
via resonant leptoquark mediated neutrino-nucleon interactions, propagates
through the Earth without significant attenuation and decays near the surface
to a $\tau$ lepton; and (b) a cosmogenic sterile neutrino interacts with the
matter near the surface of Earth and generates a $\tau$ lepton. These two
scenarios give significantly large survival probabilities even when
regeneration effects are not taken into account. In the second scenario, the
distribution of emergent tau energy peaks in the same energy range as seen by
ANITA.
| [
{
"created": "Mon, 3 Dec 2018 17:23:44 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2019 14:24:24 GMT",
"version": "v2"
},
{
"created": "Wed, 1 May 2019 14:27:28 GMT",
"version": "v3"
}
] | 2019-05-22 | [
[
"Chauhan",
"Bhavesh",
""
],
[
"Mohanty",
"Subhendra",
""
]
] | The ANITA experiment has seen anomalous Earth emergent showers of EeV energies which cannot be explained with Standard Model interactions. In addition, tests of lepton flavor universality in $ R(D^{(\ast)})$ and $R(K^{(\ast)})$ have shown significant deviations from theoretical predictions. It is known that, among single leptoquark solutions, only the chiral vector leptoquark $U_1 \sim (\mathbf{3}, \mathbf{1} , 2/3)$ can simultaneously address the discrepancies. In this paper, we show that the leptoquark motivated by flavor anomalies coupled to a sterile neutrino can also explain the ANITA Anomalous Events. We consider two scenarios, (a) the sterile neutrino, produced via resonant leptoquark mediated neutrino-nucleon interactions, propagates through the Earth without significant attenuation and decays near the surface to a $\tau$ lepton; and (b) a cosmogenic sterile neutrino interacts with the matter near the surface of Earth and generates a $\tau$ lepton. These two scenarios give significantly large survival probabilities even when regeneration effects are not taken into account. In the second scenario, the distribution of emergent tau energy peaks in the same energy range as seen by ANITA. |
1009.1164 | Joerg Jaeckel | Steven Abel, Matthew J. Dolan, Joerg Jaeckel and Valentin V. Khoze | Pure General Gauge Mediation for Early LHC Searches | 22 pages, 6 figures. Version 2: added discussion of Tevatron limits | null | 10.1007/JHEP12(2010)049 | IPPP/10/57; DCPT/10/114; CERN-PH-TH/2010-200; DAMTP-2010-60 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present benchmark points for Pure General Gauge Mediation (GGM) models
specifically optimised for early LHC searches. The pure GGM set-up is as
defined in our previous paper arXiv:0910.2674: namely we adopt the minimal
set-up in which B_mu is generated only through gauge interactions, and as a
result tan beta is a prediction rather than an input. The only input parameters
are messenger masses together with two independent scales which generate
gaugino and scalar masses. The parameter space favoured by current experimental
data includes an interesting region with light gluinos (m_g < 500 GeV and
relatively heavy squarks) and a bino-like NLSP where early discovery is likely.
We also find interesting regions of parameter space where the NLSP is a stau or
stau/neutralino co-NLSP and the squark masses are relatively low. We present
benchmark points which are typical for each of these three regions, and give
the spectrum, branching ratios, and also the overall 2 -> 2 cross-sections.
This data in SLHA format can be found at http://www.ippp.dur.ac.uk/~SUSY
| [
{
"created": "Mon, 6 Sep 2010 21:00:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 2010 11:54:47 GMT",
"version": "v2"
}
] | 2015-05-19 | [
[
"Abel",
"Steven",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"Jaeckel",
"Joerg",
""
],
[
"Khoze",
"Valentin V.",
""
]
] | We present benchmark points for Pure General Gauge Mediation (GGM) models specifically optimised for early LHC searches. The pure GGM set-up is as defined in our previous paper arXiv:0910.2674: namely we adopt the minimal set-up in which B_mu is generated only through gauge interactions, and as a result tan beta is a prediction rather than an input. The only input parameters are messenger masses together with two independent scales which generate gaugino and scalar masses. The parameter space favoured by current experimental data includes an interesting region with light gluinos (m_g < 500 GeV and relatively heavy squarks) and a bino-like NLSP where early discovery is likely. We also find interesting regions of parameter space where the NLSP is a stau or stau/neutralino co-NLSP and the squark masses are relatively low. We present benchmark points which are typical for each of these three regions, and give the spectrum, branching ratios, and also the overall 2 -> 2 cross-sections. This data in SLHA format can be found at http://www.ippp.dur.ac.uk/~SUSY |
1409.1460 | Chong Sheng Li | Hai Tao Li, Chong Sheng Li, Shi Ang Li | Renormalization group improved predictions for $t\bar{t}W^\pm$
production at hadron colliders | 23 pages, 7 figures and 2 tables; final version in PRD | Phys. Rev. D 90, 094009 (2014) | 10.1103/PhysRevD.90.094009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the factorization and resummation of the $t\bar{t}W^\pm$ production
at hadron colliders. The cross section in the threshold limit can be factorized
into a convolution of hard and soft functions and parton distribution functions
with the soft-collinear effective theory. We calculate the next-to-leading
order soft function for the associated production of the heavy quark pair and
colorless particle, and we perform the resummation calculation with the
next-to-next-to-leading logarithms accuracy. Our results show that the
resummation effects reduce the dependence of the cross section on the scales
significantly and increase the total cross section by $7-13\%$ compared with
NLO QCD results.
| [
{
"created": "Thu, 4 Sep 2014 15:03:53 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Nov 2014 13:49:26 GMT",
"version": "v2"
}
] | 2014-11-14 | [
[
"Li",
"Hai Tao",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Li",
"Shi Ang",
""
]
] | We study the factorization and resummation of the $t\bar{t}W^\pm$ production at hadron colliders. The cross section in the threshold limit can be factorized into a convolution of hard and soft functions and parton distribution functions with the soft-collinear effective theory. We calculate the next-to-leading order soft function for the associated production of the heavy quark pair and colorless particle, and we perform the resummation calculation with the next-to-next-to-leading logarithms accuracy. Our results show that the resummation effects reduce the dependence of the cross section on the scales significantly and increase the total cross section by $7-13\%$ compared with NLO QCD results. |
1010.5999 | Kristian McDonald | Kristian L. McDonald and David E. Morrissey | Low-Energy Signals from Kinetic Mixing with a Warped Abelian Hidden
Sector | (1+32) Pages, 13 Figures. v2: JHEP version (minor modifications,
results unchanged) | JHEP 1102:087,2011 | 10.1007/JHEP02(2011)087 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the detailed phenomenology of a light Abelian hidden sector in
the Randall-Sundrum framework. Relative to other works with light hidden
sectors, the main new feature is a tower of hidden Kaluza-Klein vectors that
kinetically mix with the Standard Model photon and Z. We investigate the decay
properties of the hidden sector fields in some detail, and develop an approach
for calculating processes initiated on the ultraviolet brane of a warped space
with large injection momentum relative to the infrared scale. Using these
results, we determine the detailed bounds on the light warped hidden sector
from precision electroweak measurements and low-energy experiments. We find
viable regions of parameter space that lead to significant production rates for
several of the hidden Kaluza-Klein vectors in meson factories and fixed-target
experiments. This offers the possibility of exploring the structure of an extra
spacetime dimension with lower-energy probes.
| [
{
"created": "Thu, 28 Oct 2010 15:53:51 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2011 14:53:52 GMT",
"version": "v2"
}
] | 2011-03-17 | [
[
"McDonald",
"Kristian L.",
""
],
[
"Morrissey",
"David E.",
""
]
] | We investigate the detailed phenomenology of a light Abelian hidden sector in the Randall-Sundrum framework. Relative to other works with light hidden sectors, the main new feature is a tower of hidden Kaluza-Klein vectors that kinetically mix with the Standard Model photon and Z. We investigate the decay properties of the hidden sector fields in some detail, and develop an approach for calculating processes initiated on the ultraviolet brane of a warped space with large injection momentum relative to the infrared scale. Using these results, we determine the detailed bounds on the light warped hidden sector from precision electroweak measurements and low-energy experiments. We find viable regions of parameter space that lead to significant production rates for several of the hidden Kaluza-Klein vectors in meson factories and fixed-target experiments. This offers the possibility of exploring the structure of an extra spacetime dimension with lower-energy probes. |
2006.13110 | Aleks Smolkovi\v{c} | Bla\v{z} Bortolato, Jernej F. Kamenik, Nejc Ko\v{s}nik, Aleks
Smolkovi\v{c} | Optimized probes of $CP$-odd effects in the $t \bar{t} h$ process at
hadron colliders | As published | null | 10.1016/j.nuclphysb.2021.115328 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use machine learning (ML) and non-ML techniques to study optimized
$CP$-odd observables, directly and maximally sensitive to the $CP$-odd $i
\tilde \kappa \bar t \gamma^5 t h$ interaction at the LHC and prospective
future hadron colliders using the final state with a Higgs boson and a top
quark pair, $pp\to t\bar t h$, followed by semileptonic $t$ decays. We perform
phase-space optimization of manifestly $CP$-odd observables ($\boldsymbol
\omega$), sensitive to the sign of $\tilde \kappa$, and constructed from
experimentally accessible final state momenta. We identify a simple optimized
linear combination $\boldsymbol \alpha\cdot \boldsymbol\omega$ that gives
similar sensitivity as the studied fully fledged ML models. Using
$\boldsymbol\alpha\cdot \boldsymbol\omega$ we project the expected
sensitivities to $\tilde \kappa$ at HL-LHC, HE-LHC, and FCC-hh.
| [
{
"created": "Tue, 23 Jun 2020 16:02:16 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2020 14:28:19 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Feb 2021 14:50:25 GMT",
"version": "v3"
}
] | 2021-02-03 | [
[
"Bortolato",
"Blaž",
""
],
[
"Kamenik",
"Jernej F.",
""
],
[
"Košnik",
"Nejc",
""
],
[
"Smolkovič",
"Aleks",
""
]
] | We use machine learning (ML) and non-ML techniques to study optimized $CP$-odd observables, directly and maximally sensitive to the $CP$-odd $i \tilde \kappa \bar t \gamma^5 t h$ interaction at the LHC and prospective future hadron colliders using the final state with a Higgs boson and a top quark pair, $pp\to t\bar t h$, followed by semileptonic $t$ decays. We perform phase-space optimization of manifestly $CP$-odd observables ($\boldsymbol \omega$), sensitive to the sign of $\tilde \kappa$, and constructed from experimentally accessible final state momenta. We identify a simple optimized linear combination $\boldsymbol \alpha\cdot \boldsymbol\omega$ that gives similar sensitivity as the studied fully fledged ML models. Using $\boldsymbol\alpha\cdot \boldsymbol\omega$ we project the expected sensitivities to $\tilde \kappa$ at HL-LHC, HE-LHC, and FCC-hh. |
1203.0187 | Dilip Kumar Ghosh | Dilip Kumar Ghosh, Probir Roy, Sourov Roy | Four lepton flavor violating signals at the LHC | 16 pages (single column format), 5 eps figures, some typos corrected
and references reordered | null | 10.1007/JHEP05(2012)067 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some yet unknown dynamics is expected to be at work behind the flavor puzzles
of the Standard Model. Speculations exist that this may manifest itself in
significant strength at the terascale. One consequence may be lepton flavor
violation with total lepton number conserved. Already observed in neutrino
oscillation experiments, such a phenomenon may show up more prominently at TeV
energies, thus signaling a completely new physics. Proposed flavor violating
charged dilepton states have already been studied with reference to the LHC.
Here we study the production and detection at the LHC of flavor violating
charged quadrileptons which are shown to have certain advantages over dileptons
in searching for lepton flavor violation. A classification of all six-fermionic
operators, in the chiral basis and contributing to such processes, is made and
the corresponding cross section for each in 14 TeV pp collisions is computed
under the hypothesis of single operator dominance. We further present the
sensitivity reach of the new physics scale $\Lambda$ in terms of the integrated
luminosity.
| [
{
"created": "Thu, 1 Mar 2012 14:00:29 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Mar 2012 11:27:04 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Roy",
"Probir",
""
],
[
"Roy",
"Sourov",
""
]
] | Some yet unknown dynamics is expected to be at work behind the flavor puzzles of the Standard Model. Speculations exist that this may manifest itself in significant strength at the terascale. One consequence may be lepton flavor violation with total lepton number conserved. Already observed in neutrino oscillation experiments, such a phenomenon may show up more prominently at TeV energies, thus signaling a completely new physics. Proposed flavor violating charged dilepton states have already been studied with reference to the LHC. Here we study the production and detection at the LHC of flavor violating charged quadrileptons which are shown to have certain advantages over dileptons in searching for lepton flavor violation. A classification of all six-fermionic operators, in the chiral basis and contributing to such processes, is made and the corresponding cross section for each in 14 TeV pp collisions is computed under the hypothesis of single operator dominance. We further present the sensitivity reach of the new physics scale $\Lambda$ in terms of the integrated luminosity. |
hep-ph/9406339 | Kiselev | V.V.Kiselev, A.K.Likhoded, A.V.Tkabladze | $B_c$ spectroscopy | IHEP 94-51, LATEX, 39 pages | Phys.Rev. D51 (1995) 3613-3627 | 10.1103/PhysRevD.51.3613 | null | hep-ph | null | In the framework of potential models for heavy quarkonium the mass spectrum
for the system ($\bar b c$) is considered. Spin-dependent splittings, taking
into account a change of a constant for effective Coulomb interaction between
the quarks, and widths of radiative transitions between the ($\bar b c$) levels
are calculated. In the framework of QCD sum rules, masses of the lightest
vector $B_c^*$ and pseudoscalar $B_c$ states are estimated, scaling relation
for leptonic constants of heavy quarkonia is derived, and the leptonic constant
$f_{B_C}$ is evaluated.
| [
{
"created": "Wed, 15 Jun 1994 10:19:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kiselev",
"V. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Tkabladze",
"A. V.",
""
]
] | In the framework of potential models for heavy quarkonium the mass spectrum for the system ($\bar b c$) is considered. Spin-dependent splittings, taking into account a change of a constant for effective Coulomb interaction between the quarks, and widths of radiative transitions between the ($\bar b c$) levels are calculated. In the framework of QCD sum rules, masses of the lightest vector $B_c^*$ and pseudoscalar $B_c$ states are estimated, scaling relation for leptonic constants of heavy quarkonia is derived, and the leptonic constant $f_{B_C}$ is evaluated. |
1510.05008 | Michael Gustafsson Dr | Cha\"imae El Aisati, Michael Gustafsson, Thomas Hambye, Tiziana Scarna | Dark Matter Decay to a Photon and a Neutrino: the Double Monochromatic
Smoking Gun Scenario | 16 pages, 11 figures, 3 tables | Phys. Rev. D 93, 043535 (2016) | 10.1103/PhysRevD.93.043535 | ULB-TH/15-12 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the energy range from few TeV to 25 TeV, upper bounds on the dark matter
decay rate into high energy monochromatic neutrinos have recently become
comparable to those on monochromatic gamma-ray lines. This implies clear
possibilities of a future double "smoking-gun" evidence for the dark matter
particle, from the observation of both a gamma and a neutrino line at the same
energy. In particular, we show that a scenario where both lines are induced
from the same dark matter particle decay leads to correlations that can already
be tested. We study this "double monochromatic" scenario by considering the
complete list of lowest dimensional effective operators that could induce such
a decay. Furthermore, we argue that, on top of lines from decays into two-body
final states, three-body final states can also be highly relevant. In addition
to producing a distinct hard photon spectrum, three-body final states also
produce a line-like feature in the neutrino spectrum that can be searched for
by neutrino telescopes.
| [
{
"created": "Fri, 16 Oct 2015 20:04:11 GMT",
"version": "v1"
}
] | 2016-02-24 | [
[
"Aisati",
"Chaïmae El",
""
],
[
"Gustafsson",
"Michael",
""
],
[
"Hambye",
"Thomas",
""
],
[
"Scarna",
"Tiziana",
""
]
] | In the energy range from few TeV to 25 TeV, upper bounds on the dark matter decay rate into high energy monochromatic neutrinos have recently become comparable to those on monochromatic gamma-ray lines. This implies clear possibilities of a future double "smoking-gun" evidence for the dark matter particle, from the observation of both a gamma and a neutrino line at the same energy. In particular, we show that a scenario where both lines are induced from the same dark matter particle decay leads to correlations that can already be tested. We study this "double monochromatic" scenario by considering the complete list of lowest dimensional effective operators that could induce such a decay. Furthermore, we argue that, on top of lines from decays into two-body final states, three-body final states can also be highly relevant. In addition to producing a distinct hard photon spectrum, three-body final states also produce a line-like feature in the neutrino spectrum that can be searched for by neutrino telescopes. |
2207.04072 | David Vanegas Forero | Richard H. Benavides, D.V. Forero, Luis Mu\~noz, Jose M. Mu\~noz,
Alejandro Rico, A. Tapia | Five texture zeros in the lepton sector and neutrino oscillations at
DUNE | 30 pages, 11 figures, 12 tables, v2: minor typos corrected, matches
version accepted for publication in PRD | null | 10.1103/PhysRevD.107.036008 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In this work, we have assumed special structures for the charged and neutral
mass matrices in the lepton sector, inspired by structures for the up and down
quark mass matrices that result by assuming a certain number of symmetrical
zeros in their entries named texture zeros. A prediction of the lepton mixing
matrix results from the rotation matrices that diagonalize the mass matrices in
the neutral and charged lepton sectors. The use of texture zeros reduces the
number of spurious parameters to the minimal ones needed to explain
observations i.e. charged lepton masses and neutrino oscillation parameters.
Specifically, we have considered the case of five texture zeros and we have
confronted the resulting lepton mixing matrices with current measurements in
the neutrino sector. Finally, sensitivities to the independent parameters in
the mixing predicted by the nonequivalent forms were studied using simulated
events at the DUNE neutrino oscillation experiment. We have found that DUNE is
sensitive to nonzero CP violation allowed in the models.
| [
{
"created": "Fri, 8 Jul 2022 18:02:57 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2023 20:53:04 GMT",
"version": "v2"
}
] | 2023-02-22 | [
[
"Benavides",
"Richard H.",
""
],
[
"Forero",
"D. V.",
""
],
[
"Muñoz",
"Luis",
""
],
[
"Muñoz",
"Jose M.",
""
],
[
"Rico",
"Alejandro",
""
],
[
"Tapia",
"A.",
""
]
] | In this work, we have assumed special structures for the charged and neutral mass matrices in the lepton sector, inspired by structures for the up and down quark mass matrices that result by assuming a certain number of symmetrical zeros in their entries named texture zeros. A prediction of the lepton mixing matrix results from the rotation matrices that diagonalize the mass matrices in the neutral and charged lepton sectors. The use of texture zeros reduces the number of spurious parameters to the minimal ones needed to explain observations i.e. charged lepton masses and neutrino oscillation parameters. Specifically, we have considered the case of five texture zeros and we have confronted the resulting lepton mixing matrices with current measurements in the neutrino sector. Finally, sensitivities to the independent parameters in the mixing predicted by the nonequivalent forms were studied using simulated events at the DUNE neutrino oscillation experiment. We have found that DUNE is sensitive to nonzero CP violation allowed in the models. |
hep-ph/0308069 | Mustafa Savci | T. M. Aliev, V. Bashiry, M. Savci | General analysis of CP violation in polarized (b -> d l^+ l^-) decay | 25 pages, 20 figures, LaTeX formatted | Eur.Phys.J.C31:511-523,2003 | 10.1140/epjc/s2003-01380-4 | metu-phys-hep-0308019 | hep-ph | null | The CP violating asymmetries in the (b -> d l^+ l^-) decay, when one of the
leptons is polarized, is investigated using the most general form of the
effective Hamiltonian. The sensitivity of the CP violating asymmetries on the
new Wilson coefficients is studied.
| [
{
"created": "Wed, 6 Aug 2003 14:09:11 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Aliev",
"T. M.",
""
],
[
"Bashiry",
"V.",
""
],
[
"Savci",
"M.",
""
]
] | The CP violating asymmetries in the (b -> d l^+ l^-) decay, when one of the leptons is polarized, is investigated using the most general form of the effective Hamiltonian. The sensitivity of the CP violating asymmetries on the new Wilson coefficients is studied. |
2106.01449 | Atri Dey | Atri Dey and Jayita Lahiri and Biswarup Mukhopadhyaya | Muon g-2 and a type-X two Higgs doublet scenario: some studies in
high-scale validity | 46 pages, 27 figures | null | 10.1103/PhysRevD.106.055023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the high-scale validity of a Type-X two Higgs doublet scenario which
provides an explanation of the observed value of muon $(g-2)$. This region
admits of a pseudoscalar physical state, which is well below the observed
125-GeV scalar in mass. A second neutral scalar particle can be both above and
below 125 GeV in such a scenario. Admissible regions in the parameter space are
obtained by using the most recent data on muon $(g-2)$, theoretical constraints
such as low-scale perturbativity and vacuum stability, and also all
experimental constraints, including the available LHC results. Among other
things, both the aforesaid orders of CP-even neutral scalar masses are included
in our benchmark studies. Two-loop renormalisation group equations are used to
predict the values of various couplings at high scales, and the regions in the
space spanned by low-scale parameters, which retain perturbative unitarity as
well as vacuum stability upto various scales are identified. We thus conclude
that such a scenario, while successfully explaining the observed muon $(g-2)$,
can be valid upto energy scales ranging from $10^{4}$ GeV to the Planck scale,
thus opening up directions of thought on its ultraviolet completion.
| [
{
"created": "Wed, 2 Jun 2021 20:17:16 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Dey",
"Atri",
""
],
[
"Lahiri",
"Jayita",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | We study the high-scale validity of a Type-X two Higgs doublet scenario which provides an explanation of the observed value of muon $(g-2)$. This region admits of a pseudoscalar physical state, which is well below the observed 125-GeV scalar in mass. A second neutral scalar particle can be both above and below 125 GeV in such a scenario. Admissible regions in the parameter space are obtained by using the most recent data on muon $(g-2)$, theoretical constraints such as low-scale perturbativity and vacuum stability, and also all experimental constraints, including the available LHC results. Among other things, both the aforesaid orders of CP-even neutral scalar masses are included in our benchmark studies. Two-loop renormalisation group equations are used to predict the values of various couplings at high scales, and the regions in the space spanned by low-scale parameters, which retain perturbative unitarity as well as vacuum stability upto various scales are identified. We thus conclude that such a scenario, while successfully explaining the observed muon $(g-2)$, can be valid upto energy scales ranging from $10^{4}$ GeV to the Planck scale, thus opening up directions of thought on its ultraviolet completion. |
1402.3979 | Charanjit S. Aulakh | Charanjit S. Aulakh | Bajc-Melfo Vacua enable YUMGUTs | Published version, 23 pages, pdfLatex | Phys. Rev. D91,055012(2015) | null | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bajc-Melfo(\textbf{BM}) two field ($S,\phi$) superpotentials define
metastable F-term supersymmetry breaking vacua suitable as hidden sectors for
calculable and realistic family and Grand Unification unification models. The
undetermined vev $<S_s>$ of the Polonyi field that breaks Supersymmetry can be
fixed either by coupling to N=1 Supergravity or by radiative corrections.
\textbf{BM} hidden sectors extend to symmetric multiplets $(S,\phi)_{ab}$ of a
gauged $O(N_g)$ family symmetry, broken at the GUT scale, so that the $O(N_g)$
charged component vevs $<\hat S_{ab}>$ are also undetermined before accounting
for the $O(N_g)$ D-terms: which fix them by cancellation against D-term
contributions from the visible sector. This facilitates Yukawon Ultra Minimal
GUTs(YUMGUTs) proposed in [C.S.Aulakh and C.K.Khosa, Phys.Rev.D
90,045008(2014)] by relieving the visible sector from the need to give null
D-terms for the family symmetry $ O(N_g)$. We analyze symmetry breaking and and
spectra of the hidden sector fields in the Supergravity resolved case when
$N_g=1,2,3$. Besides the Polonyi field $S_s$, most of the superfields $\hat
S_{ab}$ remain light, with fermions getting masses only from loop corrections.
Such modes may yield novel dark matter lighter than 100 GeV. Possible Polonyi
and moduli problems associated with the the fields $S_{ab}$ call for detailed
investigation of loop effects due to the Yukawa and gauge interactions in the
hidden sector and of post-inflationary field relaxation dynamics.
| [
{
"created": "Mon, 17 Feb 2014 12:30:55 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2015 08:20:52 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Aulakh",
"Charanjit S.",
""
]
] | Bajc-Melfo(\textbf{BM}) two field ($S,\phi$) superpotentials define metastable F-term supersymmetry breaking vacua suitable as hidden sectors for calculable and realistic family and Grand Unification unification models. The undetermined vev $<S_s>$ of the Polonyi field that breaks Supersymmetry can be fixed either by coupling to N=1 Supergravity or by radiative corrections. \textbf{BM} hidden sectors extend to symmetric multiplets $(S,\phi)_{ab}$ of a gauged $O(N_g)$ family symmetry, broken at the GUT scale, so that the $O(N_g)$ charged component vevs $<\hat S_{ab}>$ are also undetermined before accounting for the $O(N_g)$ D-terms: which fix them by cancellation against D-term contributions from the visible sector. This facilitates Yukawon Ultra Minimal GUTs(YUMGUTs) proposed in [C.S.Aulakh and C.K.Khosa, Phys.Rev.D 90,045008(2014)] by relieving the visible sector from the need to give null D-terms for the family symmetry $ O(N_g)$. We analyze symmetry breaking and and spectra of the hidden sector fields in the Supergravity resolved case when $N_g=1,2,3$. Besides the Polonyi field $S_s$, most of the superfields $\hat S_{ab}$ remain light, with fermions getting masses only from loop corrections. Such modes may yield novel dark matter lighter than 100 GeV. Possible Polonyi and moduli problems associated with the the fields $S_{ab}$ call for detailed investigation of loop effects due to the Yukawa and gauge interactions in the hidden sector and of post-inflationary field relaxation dynamics. |
hep-ph/9912433 | Sally Dawson | S. Dawson | Physics in 2006 | Invited talk given at Workshop on Studies on Colliders and Collider
Physics at the Highest Energies: Muon Colliders at 10 TeV to 100 TeV,
Montauk, New York, Sept. 27- Oct. 1, 1999 | null | 10.1063/1.1361668 | BNL-HET-99/44 | hep-ph | null | Any consideration of future physics facilities must be made in the context of
the Tevatron and the LHC. I discuss some examples of physics results which
could emerge from these machines and the resulting questions which would remain
for a high energy $e^+e^-$ collider. Particular attention is paid to the
electroweak symmetry breaking sector. If a light Higgs boson exists, it will be
observed at the LHC and the role of any later accelerator will be to map out
the Higg's boson mass and couplings and then determine the space of possible
models. If there is no light Higgs boson, then some effects of a strongly
interacting electroweak symmetry breaking sector will be observed at the LHC
and I discuss the role of a high energy linear collider in exploring this
scenario.
| [
{
"created": "Mon, 20 Dec 1999 21:04:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dawson",
"S.",
""
]
] | Any consideration of future physics facilities must be made in the context of the Tevatron and the LHC. I discuss some examples of physics results which could emerge from these machines and the resulting questions which would remain for a high energy $e^+e^-$ collider. Particular attention is paid to the electroweak symmetry breaking sector. If a light Higgs boson exists, it will be observed at the LHC and the role of any later accelerator will be to map out the Higg's boson mass and couplings and then determine the space of possible models. If there is no light Higgs boson, then some effects of a strongly interacting electroweak symmetry breaking sector will be observed at the LHC and I discuss the role of a high energy linear collider in exploring this scenario. |
hep-ph/0701170 | Michel Davier | Michel Davier, Andreas Hoecker, Zhiqing Zhang | ALEPH Tau Spectral Functions and QCD | 14 pages, 5 figures, invited talk at the Tau06 International
Workshop, Pisa, September 19-22 2006 | Nucl.Phys.Proc.Suppl.169:22-35,2007 | 10.1016/j.nuclphysbps.2007.02.109 | null | hep-ph hep-ex | null | Hadronic $\tau$ decays provide a clean laboratory for the precise study of
quantum chromodynamics (QCD). Observables based on the spectral functions of
hadronic $\tau$ decays can be related to QCD quark-level calculations to
determine fundamental quantities like the strong coupling constant, quark and
gluon condensates. Using the ALEPH spectral functions and branching ratios,
complemented by some other available measurements, and a revisited analysis of
the theoretical framework, the value $\asm = 0.345 \pm 0.004_{\rm exp} \pm
0.009_{\rm th}$ is obtained. Taken together with the determination of \asZ from
the global electroweak fit, this result leads to the most accurate test of
asymptotic freedom: the value of the logarithmic slope of $\alpha_s^{-1}(s)$ is
found to agree with QCD at a precision of 4%. The value of \asZ obtained from
$\tau$ decays is $\asZ = 0.1215 \pm 0.0004_{\rm exp} \pm 0.0010_{\rm th} \pm
0.0005_{\rm evol}
= 0.1215 \pm 0.0012$.
| [
{
"created": "Sat, 20 Jan 2007 16:30:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Davier",
"Michel",
""
],
[
"Hoecker",
"Andreas",
""
],
[
"Zhang",
"Zhiqing",
""
]
] | Hadronic $\tau$ decays provide a clean laboratory for the precise study of quantum chromodynamics (QCD). Observables based on the spectral functions of hadronic $\tau$ decays can be related to QCD quark-level calculations to determine fundamental quantities like the strong coupling constant, quark and gluon condensates. Using the ALEPH spectral functions and branching ratios, complemented by some other available measurements, and a revisited analysis of the theoretical framework, the value $\asm = 0.345 \pm 0.004_{\rm exp} \pm 0.009_{\rm th}$ is obtained. Taken together with the determination of \asZ from the global electroweak fit, this result leads to the most accurate test of asymptotic freedom: the value of the logarithmic slope of $\alpha_s^{-1}(s)$ is found to agree with QCD at a precision of 4%. The value of \asZ obtained from $\tau$ decays is $\asZ = 0.1215 \pm 0.0004_{\rm exp} \pm 0.0010_{\rm th} \pm 0.0005_{\rm evol} = 0.1215 \pm 0.0012$. |
hep-ph/0208093 | Daniele Fargion | D. Fargion | Ultra high-energy neutrino at GZK energy: Z-WW showering in dark halo
and tau airshowers emerging from the Earth | 13 pages, 10 Fig, 1 Table, SPIE Conference 4858, Particle
Astrophysics Instrumentation (Gorham Ed.), Talk 4858-01 Updated and Corrected
Final Table | null | 10.1117/12.457958 | 4858-01 | hep-ph astro-ph nucl-ex | null | Relic neutrino nu_r light masses clustering in Galactic and Local Hot Dark
Halos act as a beam dump calorimeter. Ultra High Energy nu, above ZeV, born by
AGNs, GRBs at cosmic edges, overcoming (GZK) cut-off, may hit near Z resonance
and WW-ZZ channels energies: their showering into UHECR fit observed data . Any
tiny neutrino mass splitting may reflect into a twin bump at highest GZK energy
cut-off. The Z or WW,ZZ showering explain a peculiar clustering in observed
UHECR spectra at 10^19, 210^19, 4 10^19 eV found by AGASA. Coincidence of
clustered UHECR with highest gamma BLac sources is well tuned to Z-Showering
Scenario. Additional prompt TeVs signals occur offering a natural solution of
growing Infrared-TeV cut-off paradoxes related to distant TeV BLac sources and
a GRB at TeV energy. Electromagnetic Cascades tail explain correlation found
between GeV-EGRET Sources and UHECR. Such UHE nu Astrophysics might trace into
Horizontal Tau Air-Showers originated by the UHE nu_tau Earth-Skimming in wide
Corona Earth Crust around the observer. These Upward and Horizontal tau
Air-Showers UPTAUS, HORTAUS, monitor huge volumes from high mountains as well
as observing from planes, balloons and satellites. HORTAUS from mountains
observe corona masses at UHE neutrino at EeVs energies comparable to few km^3,
while from satellites at orbit altitudes, at GZK energies, their corresponding
Horizontal Corona Masses may even exceed 150 km^3. The expected event rate may
exceed a dozen of event a year in Z-WW Showering model from satellite.
| [
{
"created": "Fri, 9 Aug 2002 16:00:57 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Sep 2002 16:25:38 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Fargion",
"D.",
""
]
] | Relic neutrino nu_r light masses clustering in Galactic and Local Hot Dark Halos act as a beam dump calorimeter. Ultra High Energy nu, above ZeV, born by AGNs, GRBs at cosmic edges, overcoming (GZK) cut-off, may hit near Z resonance and WW-ZZ channels energies: their showering into UHECR fit observed data . Any tiny neutrino mass splitting may reflect into a twin bump at highest GZK energy cut-off. The Z or WW,ZZ showering explain a peculiar clustering in observed UHECR spectra at 10^19, 210^19, 4 10^19 eV found by AGASA. Coincidence of clustered UHECR with highest gamma BLac sources is well tuned to Z-Showering Scenario. Additional prompt TeVs signals occur offering a natural solution of growing Infrared-TeV cut-off paradoxes related to distant TeV BLac sources and a GRB at TeV energy. Electromagnetic Cascades tail explain correlation found between GeV-EGRET Sources and UHECR. Such UHE nu Astrophysics might trace into Horizontal Tau Air-Showers originated by the UHE nu_tau Earth-Skimming in wide Corona Earth Crust around the observer. These Upward and Horizontal tau Air-Showers UPTAUS, HORTAUS, monitor huge volumes from high mountains as well as observing from planes, balloons and satellites. HORTAUS from mountains observe corona masses at UHE neutrino at EeVs energies comparable to few km^3, while from satellites at orbit altitudes, at GZK energies, their corresponding Horizontal Corona Masses may even exceed 150 km^3. The expected event rate may exceed a dozen of event a year in Z-WW Showering model from satellite. |
hep-ph/0610035 | Gennaro Corcella | Ugo Aglietti (Rome U. and INFN, Rome), Gennaro Corcella (Rome U.),
Giancarlo Ferrera (Rome U. and INFN, Rome) | Modelling non-perturbative corrections to bottom-quark fragmentation | 44 pages, 4 figures. Few changes after referee report. Sections 4 and
7 expanded, references added, numerical results unchanged | Nucl.Phys.B775:162-201,2007 | 10.1016/j.nuclphysb.2007.04.014 | ROME1/1436/06 | hep-ph | null | We describe B-hadron production in e+e- annihilation at the Z pole by means
of a model including non-perturbative corrections to b-quark fragmentation as
originating, via multiple soft emissions, from an effective QCD coupling
constant, which does not exhibit the Landau pole any longer and includes
absorbitive effects due to parton branching. We work in the framework of
perturbative fragmentation functions at NLO, with NLL DGLAP evolution and NNLL
large-x resummation in both coefficient function and initial condition of the
perturbative fragmentation function. We include hadronization corrections via
the effective coupling constant in the NNLO approximation and do not add any
further non-perturbative fragmentation function. As part of our model, we
perform the Mellin transforms of our resummed expressions exactly. We present
results on the energy distribution of b-flavoured hadrons, which we compare
with LEP and SLD data, in both x- and N-spaces. We find that, within the
theoretical uncertainties on our calculation, our model is able to reasonably
reproduce the data at x<0.92 and the first five moments of the B cross section.
| [
{
"created": "Tue, 3 Oct 2006 17:44:56 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jun 2007 17:02:40 GMT",
"version": "v2"
}
] | 2010-03-25 | [
[
"Aglietti",
"Ugo",
"",
"Rome U. and INFN, Rome"
],
[
"Corcella",
"Gennaro",
"",
"Rome U."
],
[
"Ferrera",
"Giancarlo",
"",
"Rome U. and INFN, Rome"
]
] | We describe B-hadron production in e+e- annihilation at the Z pole by means of a model including non-perturbative corrections to b-quark fragmentation as originating, via multiple soft emissions, from an effective QCD coupling constant, which does not exhibit the Landau pole any longer and includes absorbitive effects due to parton branching. We work in the framework of perturbative fragmentation functions at NLO, with NLL DGLAP evolution and NNLL large-x resummation in both coefficient function and initial condition of the perturbative fragmentation function. We include hadronization corrections via the effective coupling constant in the NNLO approximation and do not add any further non-perturbative fragmentation function. As part of our model, we perform the Mellin transforms of our resummed expressions exactly. We present results on the energy distribution of b-flavoured hadrons, which we compare with LEP and SLD data, in both x- and N-spaces. We find that, within the theoretical uncertainties on our calculation, our model is able to reasonably reproduce the data at x<0.92 and the first five moments of the B cross section. |
hep-ph/0104270 | Luca Girlanda | L. Girlanda (Padua U. & INFN) | Double chiral logarithms of Generalized Chiral Perturbation Theory for
low-energy pi-pi scattering | Latex 12 pages, one eps figure, Journal version | Phys.Lett. B513 (2001) 103-111 | 10.1016/S0370-2693(01)00724-9 | DFPD-01/TH/12 | hep-ph | null | We express the two-massless-flavor Gell-Mann--Oakes--Renner ratio in terms of
low-energy pi-pi observables, including the O(p^6) double chiral logarithms of
generalized chiral perturbation theory. Their contribution is sizeable and
tends to compensate the one from the single chiral logarithms. However it is
not large enough to spoil the convergence of the chiral expansion. As a signal
of reduced theoretical uncertainty, we find that the scale dependence from the
one-loop single logarithms is almost completely canceled by the one from the
two-loop double logarithms.
| [
{
"created": "Wed, 25 Apr 2001 15:56:05 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2001 12:36:28 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Girlanda",
"L.",
"",
"Padua U. & INFN"
]
] | We express the two-massless-flavor Gell-Mann--Oakes--Renner ratio in terms of low-energy pi-pi observables, including the O(p^6) double chiral logarithms of generalized chiral perturbation theory. Their contribution is sizeable and tends to compensate the one from the single chiral logarithms. However it is not large enough to spoil the convergence of the chiral expansion. As a signal of reduced theoretical uncertainty, we find that the scale dependence from the one-loop single logarithms is almost completely canceled by the one from the two-loop double logarithms. |
1602.08092 | Cesar Bonilla | Cesar Bonilla, Miguel Nebot, Rahul Srivastava, Jose W.F. Valle | A flavour physics scenario for the 750 GeV diphoton anomaly | null | Phys. Rev. D 93, 073009 (2016) | 10.1103/PhysRevD.93.073009 | IFIC-16-XX | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple variant of a realistic flavour symmetry scheme for fermion masses
and mixings provides a possible interpretation of the diphoton anomaly as an
electroweak singlet "flavon". The existence of TeV scale vector-like T-quarks
required to provide adequate values for CKM parameters can also naturally
account for the diphoton anomaly. Correlations between $V_{ub}$ and $V_{cb}$
with the vector-like T-quark mass can be predicted. Should the diphoton anomaly
survive in a future Run, our proposed interpretation can also be tested in
upcoming B and LHC studies.
| [
{
"created": "Thu, 25 Feb 2016 20:59:24 GMT",
"version": "v1"
}
] | 2016-04-27 | [
[
"Bonilla",
"Cesar",
""
],
[
"Nebot",
"Miguel",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Valle",
"Jose W. F.",
""
]
] | A simple variant of a realistic flavour symmetry scheme for fermion masses and mixings provides a possible interpretation of the diphoton anomaly as an electroweak singlet "flavon". The existence of TeV scale vector-like T-quarks required to provide adequate values for CKM parameters can also naturally account for the diphoton anomaly. Correlations between $V_{ub}$ and $V_{cb}$ with the vector-like T-quark mass can be predicted. Should the diphoton anomaly survive in a future Run, our proposed interpretation can also be tested in upcoming B and LHC studies. |
1402.1560 | S. Ganesh | S. Ganesh, Madhukar Mishra | A temperature dependent formation time approach for \Upsilon suppression
at LHC | Withdraw: There is a flaw in the binding energy in vacuum used for
simulations | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here a model to describe the bottomonium suppression in Pb$+$Pb
collisions at Large Hadron Collider (LHC), at $\sqrt{s_{NN}}=2.76$ TeV by using
the quasi-particle model (QPM) equation of state (EOS) for the Quark-Gluon
Plasma (QGP) expanding under Bjorken's hydrodynamical expansion. The current
model includes the modification of the formation time based on the temperature
of QGP, color screening during bottomonium production, gluon induced
dissociation and collisional damping. The cold nuclear matter (CNM) effects and
decay of higher resonances of bottomonium have also been included in the
present work. The final suppression of the bottomonium states, at mid rapidity
is calculated as a function of centrality. The results compare closely with the
recent data at Large hadron Collider (LHC) in the mid rapidity region for
various centrality bins. {\nd \it Keywords } : Color screening, Gluonic
dissociation, Collisional damping, Survival probability, CNM effects\\ {\nd \it
PACS numbers } : 12.38.Mh, 12.38.Gc, 25.75.Nq, 24.10.Pa
| [
{
"created": "Fri, 7 Feb 2014 06:45:09 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2014 06:36:12 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Jun 2014 13:11:42 GMT",
"version": "v3"
},
{
"created": "Fri, 25 Jul 2014 05:35:21 GMT",
"version": "v4"
},
{
"created": "Fri, 20 Feb 2015 14:48:05 GMT",
"version": "v5"
}
] | 2015-02-23 | [
[
"Ganesh",
"S.",
""
],
[
"Mishra",
"Madhukar",
""
]
] | We present here a model to describe the bottomonium suppression in Pb$+$Pb collisions at Large Hadron Collider (LHC), at $\sqrt{s_{NN}}=2.76$ TeV by using the quasi-particle model (QPM) equation of state (EOS) for the Quark-Gluon Plasma (QGP) expanding under Bjorken's hydrodynamical expansion. The current model includes the modification of the formation time based on the temperature of QGP, color screening during bottomonium production, gluon induced dissociation and collisional damping. The cold nuclear matter (CNM) effects and decay of higher resonances of bottomonium have also been included in the present work. The final suppression of the bottomonium states, at mid rapidity is calculated as a function of centrality. The results compare closely with the recent data at Large hadron Collider (LHC) in the mid rapidity region for various centrality bins. {\nd \it Keywords } : Color screening, Gluonic dissociation, Collisional damping, Survival probability, CNM effects\\ {\nd \it PACS numbers } : 12.38.Mh, 12.38.Gc, 25.75.Nq, 24.10.Pa |
hep-ph/0307302 | Alexei Nefediev | P.J.A.Bicudo (IST, Lisbon), A.V.Nefediev (ITEP, Moscow) | Chiral symmetry breaking solutions for QCD in the truncated Coulomb
gauge | RevTeX4, 18 pages, 3 Postscript figures, uses epsfig.sty, to appear
in Phys.Rev.D | Phys.Rev. D68 (2003) 065021 | 10.1103/PhysRevD.68.065021 | null | hep-ph | null | In this paper we study the power-like confining potentials r^alpha. The
region of allowed alphas is identified, the mass-gap equation is constructed
for an arbitrary alpha and solved for several values of the latter, and the
vacuum energy and the chiral condensate are calculated. The question of replica
solutions to the mass-gap equation for such potentials is addressed and it is
demonstrated that the number of replicas is infinite for any alpha, as a
consequence of the peculiar behaviour of the quark self-energy in the infrared
domain.
| [
{
"created": "Thu, 24 Jul 2003 12:09:43 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bicudo",
"P. J. A.",
"",
"IST, Lisbon"
],
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
]
] | In this paper we study the power-like confining potentials r^alpha. The region of allowed alphas is identified, the mass-gap equation is constructed for an arbitrary alpha and solved for several values of the latter, and the vacuum energy and the chiral condensate are calculated. The question of replica solutions to the mass-gap equation for such potentials is addressed and it is demonstrated that the number of replicas is infinite for any alpha, as a consequence of the peculiar behaviour of the quark self-energy in the infrared domain. |
hep-ph/0409153 | Stefan Michalski | Jurgen Baacke, Stefan Michalski | Scalar O(N) Model at Finite Temperature -- 2PI Effective Potential in
Different Approximations | LaTeX, 5 pages. Contribution to the Proceedings of 6th Conference on
Strong and Electroweak Matter 2004 (SEWM04), Helsinki, Finland, 16-19 Jun
2004 | null | 10.1142/9789812702159_0063 | null | hep-ph | null | We calculate the two-particle irreducible (2PI) effective potential of the
O(N) linear sigma model in 1+1 dimensions. The approximations we use are the
next-to-leading order of a 1/N expansion (for arbitrary N) and a kind of
"resummed loop approximation" for N=1. We show that the effective potential of
the 1/N expansion is convex for N=4 and N=10 whereas it is not for the "loop"
expansion and the case N=1 of the 1/N expansion.
| [
{
"created": "Tue, 14 Sep 2004 11:36:18 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Baacke",
"Jurgen",
""
],
[
"Michalski",
"Stefan",
""
]
] | We calculate the two-particle irreducible (2PI) effective potential of the O(N) linear sigma model in 1+1 dimensions. The approximations we use are the next-to-leading order of a 1/N expansion (for arbitrary N) and a kind of "resummed loop approximation" for N=1. We show that the effective potential of the 1/N expansion is convex for N=4 and N=10 whereas it is not for the "loop" expansion and the case N=1 of the 1/N expansion. |
hep-ph/0208142 | Pran Nath | Tarek Ibrahim and Pran Nath | CP Violation Effects on $B^0_{s,d}\to \it l^+\it l^-$ in Supersymmetry
at Large $\tan\beta$ | Revised version. 13 pages, Latex, including 6 figures | Phys.Rev.D67:016005,2003 | 10.1103/PhysRevD.67.016005 | null | hep-ph | null | An analytic analysis of the CP violating effects arising from the soft SUSY
breaking parameters on the decays $B^0_{s,d}\to \it l^+\it l^-$ at large
$\tan\beta$ is given. It is found that the phases have a strong effect on the
branching ratio and in some regions of the parameter space they can lead to a
variation of the branching ratio by as much as 1-2 orders of magnitude. These
results have important implications for the discovery of the $B^0_{s}\to
\mu^+\mu^-$ signal in RUNII of the Tevatron and further on how the parameter
space of SUSY models will be limited once the signal is found.
| [
{
"created": "Wed, 14 Aug 2002 19:10:33 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Sep 2002 19:01:37 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Nov 2002 21:13:45 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Ibrahim",
"Tarek",
""
],
[
"Nath",
"Pran",
""
]
] | An analytic analysis of the CP violating effects arising from the soft SUSY breaking parameters on the decays $B^0_{s,d}\to \it l^+\it l^-$ at large $\tan\beta$ is given. It is found that the phases have a strong effect on the branching ratio and in some regions of the parameter space they can lead to a variation of the branching ratio by as much as 1-2 orders of magnitude. These results have important implications for the discovery of the $B^0_{s}\to \mu^+\mu^-$ signal in RUNII of the Tevatron and further on how the parameter space of SUSY models will be limited once the signal is found. |
hep-ph/0105179 | Rafel Escribano | A. Bramon, R. Escribano, J. L. Lucio M., M. Napsuciale | Scalar sigma meson effects in rho and omega decays into pi0 pi0 gamma | 17 pages, 4 figures | Phys.Lett.B517:345-354,2001 | 10.1016/S0370-2693(01)01007-3 | LNF-01/021(P), UAB-FT-515 | hep-ph hep-ex | null | The complementarity between Chiral Perturbation Theory and the Linear Sigma
Model in the scalar channel is exploited to study $\pi^0\pi^0$ production in
$\rho$ and $\omega$ radiative decays, where the effects of a low mass scalar
resonance $\sigma(500)$ should manifest. The recently reported data on
$\rho\to\pi^0\pi^0\gamma$ seem to require the contribution of a low mass and
moderately narrow $\sigma(500)$. The properties of this controversial state
could be fixed by improving the accuracy of these measurements. Data on
$\omega\to\pi^0\pi^0\gamma$ can also be accommodated in our framework, but are
much less sensitive to the $\sigma(500)$ properties.
| [
{
"created": "Thu, 17 May 2001 16:14:32 GMT",
"version": "v1"
}
] | 2009-09-24 | [
[
"Bramon",
"A.",
""
],
[
"Escribano",
"R.",
""
],
[
"M.",
"J. L. Lucio",
""
],
[
"Napsuciale",
"M.",
""
]
] | The complementarity between Chiral Perturbation Theory and the Linear Sigma Model in the scalar channel is exploited to study $\pi^0\pi^0$ production in $\rho$ and $\omega$ radiative decays, where the effects of a low mass scalar resonance $\sigma(500)$ should manifest. The recently reported data on $\rho\to\pi^0\pi^0\gamma$ seem to require the contribution of a low mass and moderately narrow $\sigma(500)$. The properties of this controversial state could be fixed by improving the accuracy of these measurements. Data on $\omega\to\pi^0\pi^0\gamma$ can also be accommodated in our framework, but are much less sensitive to the $\sigma(500)$ properties. |
2211.07742 | David Latimer | Kiana Walter, Kobi Hall, David C. Latimer | Aligning a Majorana fermion's anapole moment with an external current
through photon emission mediated by the fermion's generalized
polarizabilities | null | null | 10.1103/PhysRevD.106.096021 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The sole static electromagnetic property of a spin-$\frac{1}{2}$ Majorana
fermion is its anapole moment. Though they cannot couple to single real
photons, these particles can interact with electric currents through virtual
photons. If a Majorana fermion is immersed in a background current, there is an
energy difference between the spin states of the fermion; the higher energy
state has its anapole moment antialigned with the current. In this paper, we
address the ability of a system of initially unpolarized Majorana fermions to
achieve some degree of polarization relative to a static background current. In
considering processes that allow the Majorana fermion's spin to flip to the
lower-energy state, we focus upon two irreversible processes: the spontaneous
emission of two real photons and the emission of a single real photon emitted
in virtual Compton scattering. Both of these processes involve coupling to
photons via the fermion's polarizaibilities. We compute the spin-flip
transition rates for these processes using a low-energy expansion of the
Hamiltonian and construct a toy model to showcase how these rates depend upon
the underlying parameters within a model. Applying these ideas to a thermal
dark matter (DM) model, we find that when the DM thermally decouples from the
Standard Model plasma in the early universe, two-photon emission is negligible
but partial polarization for the DM medium can proceed via virtual Compton
scattering if sufficient currents exist.
| [
{
"created": "Mon, 14 Nov 2022 20:40:09 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Walter",
"Kiana",
""
],
[
"Hall",
"Kobi",
""
],
[
"Latimer",
"David C.",
""
]
] | The sole static electromagnetic property of a spin-$\frac{1}{2}$ Majorana fermion is its anapole moment. Though they cannot couple to single real photons, these particles can interact with electric currents through virtual photons. If a Majorana fermion is immersed in a background current, there is an energy difference between the spin states of the fermion; the higher energy state has its anapole moment antialigned with the current. In this paper, we address the ability of a system of initially unpolarized Majorana fermions to achieve some degree of polarization relative to a static background current. In considering processes that allow the Majorana fermion's spin to flip to the lower-energy state, we focus upon two irreversible processes: the spontaneous emission of two real photons and the emission of a single real photon emitted in virtual Compton scattering. Both of these processes involve coupling to photons via the fermion's polarizaibilities. We compute the spin-flip transition rates for these processes using a low-energy expansion of the Hamiltonian and construct a toy model to showcase how these rates depend upon the underlying parameters within a model. Applying these ideas to a thermal dark matter (DM) model, we find that when the DM thermally decouples from the Standard Model plasma in the early universe, two-photon emission is negligible but partial polarization for the DM medium can proceed via virtual Compton scattering if sufficient currents exist. |
0810.0366 | Veselov Alexander | Yu.A.Simonov, A.I.Veselov | Single eta production in heavy quarkonia: breakdown of multipole
expansion | 12 pages, 1 figure | null | 10.1016/j.physletb.2009.02.025 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\eta$ production in the $(n,n')$ bottomonium transitions $\Upsilon (n)
\to \Upsilon (n') \eta, $ is studied in the method used before for dipion heavy
quarkonia transitions. The widths $\Gamma_\eta(n,n')$ are calculated without
fitting parameters for $n=2,3,4,5, n'=1$. Resulting $\Gamma_\eta(4,1)$ is found
to be large in agreement with recent data. Multipole expansion method is shown
to be inadequate for large size systems considered.
| [
{
"created": "Thu, 2 Oct 2008 09:15:55 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Dec 2008 08:19:19 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Simonov",
"Yu. A.",
""
],
[
"Veselov",
"A. I.",
""
]
] | The $\eta$ production in the $(n,n')$ bottomonium transitions $\Upsilon (n) \to \Upsilon (n') \eta, $ is studied in the method used before for dipion heavy quarkonia transitions. The widths $\Gamma_\eta(n,n')$ are calculated without fitting parameters for $n=2,3,4,5, n'=1$. Resulting $\Gamma_\eta(4,1)$ is found to be large in agreement with recent data. Multipole expansion method is shown to be inadequate for large size systems considered. |
hep-ph/0006191 | Herbert Weigel | Herbert Weigel | Radial Excitations of low-lying Baryons and the Structure of the Z^+
Penta-QuarK | 5 pages LaTeX, Talk presented at the 7th Conference on the
Intersections of Particle and Nuclear Physics, Quebec, May 2000. To appear in
the proceedings | AIP Conf.Proc. 549 (2002) 271-274 | 10.1063/1.1345254 | MIT-CTP # 2990 | hep-ph nucl-th | null | Within the collective quantization scheme for chiral solitons we discuss
states in higher dimensional representations of flavor SU(3) and their relation
to radially excited states in the octet. We also consider states which do not
have counterparts of the same quantum numbers in the octet or decuplet and
cannot be built from three quarks. We focus on the Z^+ penta-quark, presumably
the lightest such state, by estimating its mass and decay width.
| [
{
"created": "Fri, 16 Jun 2000 13:25:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Weigel",
"Herbert",
""
]
] | Within the collective quantization scheme for chiral solitons we discuss states in higher dimensional representations of flavor SU(3) and their relation to radially excited states in the octet. We also consider states which do not have counterparts of the same quantum numbers in the octet or decuplet and cannot be built from three quarks. We focus on the Z^+ penta-quark, presumably the lightest such state, by estimating its mass and decay width. |
1301.4849 | Mikhail Ivanov | Mikhail A. Ivanov | Multiquark states in the covariant quark confinement model | 30 pages. Plenary talk at the XXI International Baldin Seminar on
High Energy Physics Problems, September 10-15, 2012, JINR, Dubna, Russia | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This talk reviews the last applications of the covariant quark model for
studying the properties of the multiquark states: B_s-meson (quark-antiquark
state), light baryons (three-quark states) and tetraquark (four-quark state).
The form factors of the B(B_s)-> P(V)-transitions are evaluated in the full
kinematical region of momentum transfer squared. The widths of some
B_s-nonleptonic decays are calculated. The static properties of the proton and
neutron, and the \Lambda-hyperon (magnetic moments and charge radii) and the
behavior of the nucleon form factors at low momentum transfers are described.
The consequences of treating the X(3872) meson as a tetraquark bound state are
explored. The decay widths of the observed channels X->J/\psi+2\pi (3\pi) and
X-> \bar D^0 + D^0+\pi^0 via the intermediate off--shell states X->
J/\psi+\rho(\omega) and X-> \bar D + D^* are calculated. Its one-photon decay
X-> \gamma+ J/\psi is also analyzed.
| [
{
"created": "Mon, 21 Jan 2013 12:47:25 GMT",
"version": "v1"
}
] | 2013-01-22 | [
[
"Ivanov",
"Mikhail A.",
""
]
] | This talk reviews the last applications of the covariant quark model for studying the properties of the multiquark states: B_s-meson (quark-antiquark state), light baryons (three-quark states) and tetraquark (four-quark state). The form factors of the B(B_s)-> P(V)-transitions are evaluated in the full kinematical region of momentum transfer squared. The widths of some B_s-nonleptonic decays are calculated. The static properties of the proton and neutron, and the \Lambda-hyperon (magnetic moments and charge radii) and the behavior of the nucleon form factors at low momentum transfers are described. The consequences of treating the X(3872) meson as a tetraquark bound state are explored. The decay widths of the observed channels X->J/\psi+2\pi (3\pi) and X-> \bar D^0 + D^0+\pi^0 via the intermediate off--shell states X-> J/\psi+\rho(\omega) and X-> \bar D + D^* are calculated. Its one-photon decay X-> \gamma+ J/\psi is also analyzed. |
hep-ph/0101094 | A. F. W. van Hameren | A.F.W. van Hameren | Loaded Dice in Monte Carlo: importance sampling in phase space
integration and probability distributions for discrepancies | PhD thesis, uses times and euler | null | null | null | hep-ph | null | Discrepancies play an important role in the study of uniformity properties of
point sets. Their probability distributions are a help in the analysis of the
efficiency of the Quasi Monte Carlo method of numerical integration, which uses
point sets that are distributed more uniformly than sets of independently
uniformly distributed random points. In this thesis, generating functions of
probability distributions of quadratic discrepancies are calculated using
techniques borrowed from quantum field theory.
The second part of this manuscript deals with the application of the Monte
Carlo method to phase space integration, and in particular with an explicit
example of importance sampling. It concerns the integration of differential
cross sections of multi-parton QCD-processes, which contain the so-called
kinematical antenna pole structures. The algorithm is presented and compared
with RAMBO, showing a substantial reduction in computing time.
In behalf of completeness of the thesis, short introductions to probability
theory, Feynman diagrams and the Monte Carlo method of numerical integration
are included.
| [
{
"created": "Wed, 10 Jan 2001 09:48:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"van Hameren",
"A. F. W.",
""
]
] | Discrepancies play an important role in the study of uniformity properties of point sets. Their probability distributions are a help in the analysis of the efficiency of the Quasi Monte Carlo method of numerical integration, which uses point sets that are distributed more uniformly than sets of independently uniformly distributed random points. In this thesis, generating functions of probability distributions of quadratic discrepancies are calculated using techniques borrowed from quantum field theory. The second part of this manuscript deals with the application of the Monte Carlo method to phase space integration, and in particular with an explicit example of importance sampling. It concerns the integration of differential cross sections of multi-parton QCD-processes, which contain the so-called kinematical antenna pole structures. The algorithm is presented and compared with RAMBO, showing a substantial reduction in computing time. In behalf of completeness of the thesis, short introductions to probability theory, Feynman diagrams and the Monte Carlo method of numerical integration are included. |
2112.02510 | Zhan-Wei Liu | Zhe Liu, Hong-Tao An, Zhan-Wei Liu, Xiang Liu | Where are the hidden-charm hexaquarks? | 13 pages, 3 figures | Phys. Rev. D 105 (2022) no. 3, 034006 | 10.1103/PhysRevD.105.034006 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we carry out the study of hidden-charm hexaquark states with
the typical configurations $qqc\bar{q}\bar{q}\bar{c}$ ($q=u, d, s$). The mass
spectra of hidden-charm hexaquark states are obtained within the
chromo-magnetic interaction model. In addition to the mass spectra analysis, we
further illustrate their two-body strong decay behaviors. There exist some
compact bound states which cannot decay through the strong interaction.
Hopefully our results will help to search for such types of the exotic states
in the future experiments.
| [
{
"created": "Sun, 5 Dec 2021 08:27:45 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Feb 2022 03:21:17 GMT",
"version": "v2"
}
] | 2022-02-08 | [
[
"Liu",
"Zhe",
""
],
[
"An",
"Hong-Tao",
""
],
[
"Liu",
"Zhan-Wei",
""
],
[
"Liu",
"Xiang",
""
]
] | In this work, we carry out the study of hidden-charm hexaquark states with the typical configurations $qqc\bar{q}\bar{q}\bar{c}$ ($q=u, d, s$). The mass spectra of hidden-charm hexaquark states are obtained within the chromo-magnetic interaction model. In addition to the mass spectra analysis, we further illustrate their two-body strong decay behaviors. There exist some compact bound states which cannot decay through the strong interaction. Hopefully our results will help to search for such types of the exotic states in the future experiments. |
1502.03078 | Ziyue Li | Ho-Meoyng Choi, Chueng-Ryong Ji, Ziyue Li, Hui-Young Ryu | Variational Analysis of Mass Spectra and Decay Constants for Ground
State Pseudoscalar and Vector Mesons in Light-Front Quark Model | 5 figures. Added the flavor mixing effect in our analysis and
determine the mixing angles from the mass spectra of (\omega,\phi) and
(\eta,\eta'). Improved the fitting for the hyperfine splitting in heavy
mesons. arXiv admin note: text overlap with arXiv:1206.3351 | null | 10.1103/PhysRevC.92.055203 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the variational principle, we compute mass spectra and decay constants
of ground state pseudoscalar and vector mesons in the light-front quark model
(LFQM) with the QCD-motivated effective Hamiltonian including the hyperfine
interaction. By smearing out the Dirac delta function in the hyperfine
interaction, we avoid the issue of negative infinity in applying the
variational principle to the computation of meson mass spectra and provide
analytic expressions for the meson mass spectra. Our analysis with the smeared
hyperfine interaction indicates that the interaction for the heavy meson sector
including the bottom and charm quarks gets more point-like. We also consider
the flavor mixing effect in our analysis and determine the mixing angles from
the mass spectra of $(\omega,\phi)$ and $(\eta,\eta')$. Our variational
analysis with the trial wave function including the two lowest order harmonic
oscillator basis functions appears to improve the agreement with the data of
meson decay constants and the heavy meson mass spectra over the previous
computation handling the hyperfine interaction as perturbation.
| [
{
"created": "Tue, 10 Feb 2015 20:36:09 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Oct 2015 17:37:25 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Choi",
"Ho-Meoyng",
""
],
[
"Ji",
"Chueng-Ryong",
""
],
[
"Li",
"Ziyue",
""
],
[
"Ryu",
"Hui-Young",
""
]
] | Using the variational principle, we compute mass spectra and decay constants of ground state pseudoscalar and vector mesons in the light-front quark model (LFQM) with the QCD-motivated effective Hamiltonian including the hyperfine interaction. By smearing out the Dirac delta function in the hyperfine interaction, we avoid the issue of negative infinity in applying the variational principle to the computation of meson mass spectra and provide analytic expressions for the meson mass spectra. Our analysis with the smeared hyperfine interaction indicates that the interaction for the heavy meson sector including the bottom and charm quarks gets more point-like. We also consider the flavor mixing effect in our analysis and determine the mixing angles from the mass spectra of $(\omega,\phi)$ and $(\eta,\eta')$. Our variational analysis with the trial wave function including the two lowest order harmonic oscillator basis functions appears to improve the agreement with the data of meson decay constants and the heavy meson mass spectra over the previous computation handling the hyperfine interaction as perturbation. |
hep-ph/0406108 | Cleymans | J. Cleymans, A. Foerster, H. Oeschler, K. Redlich, F. Uhlig | On the chemical equilibration of strangeness-exchange reaction in
heavy-ion collisions | 9 pages, 4 figures | Phys.Lett. B603 (2004) 146-151 | 10.1016/j.physletb.2004.09.078 | null | hep-ph | null | The strangeness-exchange reaction pi + Y -> K- + N is shown to be the
dynamical origin of chemical equilibration for K- production in heavy-ion
collisions up to beam energies of 10 A GeV. The hyperons occurring in this
process are produced associately with K+ in baryon-baryon and meson-baryon
interactions. This connection is demonstrated by the ratio K-/K+ which does not
vary with centrality and shows a linear correlation with the yield of pions per
participant. At incident energies above AGS this correlation no longer holds
due to the change in the production mechanism of kaons.
| [
{
"created": "Wed, 9 Jun 2004 12:52:13 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jun 2004 14:19:46 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Cleymans",
"J.",
""
],
[
"Foerster",
"A.",
""
],
[
"Oeschler",
"H.",
""
],
[
"Redlich",
"K.",
""
],
[
"Uhlig",
"F.",
""
]
] | The strangeness-exchange reaction pi + Y -> K- + N is shown to be the dynamical origin of chemical equilibration for K- production in heavy-ion collisions up to beam energies of 10 A GeV. The hyperons occurring in this process are produced associately with K+ in baryon-baryon and meson-baryon interactions. This connection is demonstrated by the ratio K-/K+ which does not vary with centrality and shows a linear correlation with the yield of pions per participant. At incident energies above AGS this correlation no longer holds due to the change in the production mechanism of kaons. |
1612.08984 | Andreas Trautner | Michael Ratz and Andreas Trautner | $\mathcal{CP}$ violation with an unbroken $\mathcal{CP}$ transformation | 19 pages, 2 figures, 2 tables; v2: considering a different
contribution to the decay asymmetry, conclusion unchanged | JHEP 1702 (2017) 103 | 10.1007/JHEP02(2017)103 | UCI-2016-26 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A $\mathcal{CP}$ conserving $\mathrm{SU}(3)$ gauge theory is spontaneously
broken to $\mathrm{T}_7$ by the vacuum expectation value (VEV) of a
$\boldsymbol{15}$-plet. Even though the $\mathrm{SU}(3)$-$\,\mathcal{CP}$
transformation is not broken by the VEV, the theory exhibits physical
$\mathcal{CP}$ violation in the broken phase. This is because the
$\mathrm{SU}(3)$-$\,\mathcal{CP}$ transformation corresponds to the unique
order-two outer automorphism of $\mathrm{T}_7$, which is not a physical
$\mathcal{CP}$ transformation for the $\mathrm{T}_7$ states, and there is no
other possible $\mathcal{CP}$ transformation. We explicitly demonstrate that
$\mathcal{CP}$ is violated by calculating a $\mathcal{CP}$ odd decay asymmetry
in the broken phase. This scenario provides us with a natural protection for
topological vacuum terms, ensuring that
$\theta\,G_{\mu\nu}\widetilde{G}^{\mu\nu}$ is absent even though $\mathcal{CP}$
is violated for the physical states of the model.
| [
{
"created": "Wed, 28 Dec 2016 21:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2017 15:37:21 GMT",
"version": "v2"
}
] | 2017-03-02 | [
[
"Ratz",
"Michael",
""
],
[
"Trautner",
"Andreas",
""
]
] | A $\mathcal{CP}$ conserving $\mathrm{SU}(3)$ gauge theory is spontaneously broken to $\mathrm{T}_7$ by the vacuum expectation value (VEV) of a $\boldsymbol{15}$-plet. Even though the $\mathrm{SU}(3)$-$\,\mathcal{CP}$ transformation is not broken by the VEV, the theory exhibits physical $\mathcal{CP}$ violation in the broken phase. This is because the $\mathrm{SU}(3)$-$\,\mathcal{CP}$ transformation corresponds to the unique order-two outer automorphism of $\mathrm{T}_7$, which is not a physical $\mathcal{CP}$ transformation for the $\mathrm{T}_7$ states, and there is no other possible $\mathcal{CP}$ transformation. We explicitly demonstrate that $\mathcal{CP}$ is violated by calculating a $\mathcal{CP}$ odd decay asymmetry in the broken phase. This scenario provides us with a natural protection for topological vacuum terms, ensuring that $\theta\,G_{\mu\nu}\widetilde{G}^{\mu\nu}$ is absent even though $\mathcal{CP}$ is violated for the physical states of the model. |
2010.07305 | Julian Y. G\"unther | Jordy de Vries, Herbert K. Dreiner, Julian Y. G\"unther, Zeren Simon
Wang, Guanghui Zhou | Long-lived Sterile Neutrinos at the LHC in Effective Field Theory | v1: 35 pages + Appendix, 12 figures, 17 tables; v2: accepted for
publication in JHEP, typos corrected, reasoning for neglecting direct
production of sterile neutrinos via parton collisions added upon referee's
suggestion, results unchanged | null | 10.1007/JHEP03(2021)148 | APCTP Pre2020-027, BONN-TH-2020-10, RBRC-1328 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the prospects of a displaced-vertex search of sterile neutrinos at
the Large Hadron Collider (LHC) in the framework of the neutrino-extended
Standard Model Effective Field Theory ($\nu$SMEFT). The production and decay of
sterile neutrinos can proceed via the standard active-sterile neutrino mixing
in the weak current, as well as through higher-dimensional operators arising
from decoupled new physics. If sterile neutrinos are long-lived, their decay
can lead to displaced vertices which can be reconstructed. We investigate the
search sensitivities for the ATLAS/CMS detector, the future far-detector
experiments: AL3X, ANUBIS, CODEX-b, FASER, MATHUSLA, and MoEDAL-MAPP, and at
the proposed fixed-target experiment SHiP. We study scenarios where sterile
neutrinos are predominantly produced via rare charm and bottom mesons decays
through minimal mixing and/or dimension-six operators in the $\nu$SMEFT
Lagrangian. We perform simulations to determine the potential reach of
high-luminosity LHC experiments in probing the EFT operators, finding that
these experiments are very competitive with other searches.
| [
{
"created": "Wed, 14 Oct 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2021 15:46:01 GMT",
"version": "v2"
}
] | 2021-03-18 | [
[
"de Vries",
"Jordy",
""
],
[
"Dreiner",
"Herbert K.",
""
],
[
"Günther",
"Julian Y.",
""
],
[
"Wang",
"Zeren Simon",
""
],
[
"Zhou",
"Guanghui",
""
]
] | We study the prospects of a displaced-vertex search of sterile neutrinos at the Large Hadron Collider (LHC) in the framework of the neutrino-extended Standard Model Effective Field Theory ($\nu$SMEFT). The production and decay of sterile neutrinos can proceed via the standard active-sterile neutrino mixing in the weak current, as well as through higher-dimensional operators arising from decoupled new physics. If sterile neutrinos are long-lived, their decay can lead to displaced vertices which can be reconstructed. We investigate the search sensitivities for the ATLAS/CMS detector, the future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER, MATHUSLA, and MoEDAL-MAPP, and at the proposed fixed-target experiment SHiP. We study scenarios where sterile neutrinos are predominantly produced via rare charm and bottom mesons decays through minimal mixing and/or dimension-six operators in the $\nu$SMEFT Lagrangian. We perform simulations to determine the potential reach of high-luminosity LHC experiments in probing the EFT operators, finding that these experiments are very competitive with other searches. |
hep-ph/9507222 | Michael Tung | S. Groote, J.G. K"orner, and M.M. Tung | Longitudinal Contribution to the Alignment Polarization of Quarks
Produced in e+ e- Annihilation: An O(alpha_s) Effect | 18 pages, LaTeX, 6 figures are included in uuencoded PostScript
format | Z.Phys. C70 (1996) 281-290 | null | MZ-TH/95-09, FTUV/95-13, IFIC/95-13 | hep-ph | null | We calculate the longitudinal contribution to the alignment polarization
$\Pl$ of quarks produced in $e^+e^-$ annihilation. In the Standard Model, the
longitudinal alignment polarization vanishes at the Born term level and thus
receives its first non-zero contribution from the $O(\as)$ tree graph process.
We provide analytical and numerical results for the longitudinal alignment
polarization of massless and massive quarks, in particular for the recently
discovered top quark.
| [
{
"created": "Tue, 4 Jul 1995 18:04:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Groote",
"S.",
""
],
[
"K\"orner",
"J. G.",
""
],
[
"Tung",
"M. M.",
""
]
] | We calculate the longitudinal contribution to the alignment polarization $\Pl$ of quarks produced in $e^+e^-$ annihilation. In the Standard Model, the longitudinal alignment polarization vanishes at the Born term level and thus receives its first non-zero contribution from the $O(\as)$ tree graph process. We provide analytical and numerical results for the longitudinal alignment polarization of massless and massive quarks, in particular for the recently discovered top quark. |
1605.04508 | Subhadeep Mondal | Subhadeep Mondal, Santosh Kumar Rai | Probing the Heavy Neutrinos of Inverse Seesaw Model at the LHeC | text added, accepted for publication in PRD | Phys. Rev. D 94, 033008 (2016) | 10.1103/PhysRevD.94.033008 | HRI-RECAPP-2016-009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the production of a heavy neutrino and its possible signals at
the Large Hadron-electron Collider (LHeC) in the context of an inverse-seesaw
model for neutrino mass generation. The inverse seesaw model extends the
Standard Model (SM) particle content by adding two neutral singlet fermions for
each lepton generation. It is a well motivated model in the context of
generating non-zero neutrino masses and mixings. The proposed future LHeC
machine presents us with a particularly interesting possibility to probe such
extensions of the SM with new leptons due to the presence of an electron beam
in the initial state. We show that the LHeC will be able to probe an inverse
scenario with much better efficacy compared to the LHC with very nominal
integrated luminosities as well as exploit the advantage of having the electron
beam polarized to enhance the heavy neutrino production rates.
| [
{
"created": "Sun, 15 May 2016 08:37:00 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Aug 2016 11:32:18 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Mondal",
"Subhadeep",
""
],
[
"Rai",
"Santosh Kumar",
""
]
] | We consider the production of a heavy neutrino and its possible signals at the Large Hadron-electron Collider (LHeC) in the context of an inverse-seesaw model for neutrino mass generation. The inverse seesaw model extends the Standard Model (SM) particle content by adding two neutral singlet fermions for each lepton generation. It is a well motivated model in the context of generating non-zero neutrino masses and mixings. The proposed future LHeC machine presents us with a particularly interesting possibility to probe such extensions of the SM with new leptons due to the presence of an electron beam in the initial state. We show that the LHeC will be able to probe an inverse scenario with much better efficacy compared to the LHC with very nominal integrated luminosities as well as exploit the advantage of having the electron beam polarized to enhance the heavy neutrino production rates. |
1602.08011 | M. N. Rebelo | F. J. Botella, G. C. Branco, M. N. Rebelo and J. I. Silva-Marcos | What if the Masses of the First Two Quark Families are not Generated by
the Standard Higgs? | 11 pages, 1 figure | Phys. Rev. D 94, 115031 (2016) | 10.1103/PhysRevD.94.115031 | CERN-TH-2016-039 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that, in the context of the SM, $|V^2_{13}| + | V^2_{23}|$ is
expected to be large, of order one. The fact that $|V^2_{13}| + |V^2_{23}|
\approx 1.6 \times 10^{-3}$ motivates the introduction of a symmetry S which
leads to $V_{CKM} ={1\>\!\!\!\mathrm{I}} $, with only the third generation of
quarks acquiring mass. We consider two scenarios for generating the mass of the
first two quark generations and full quark mixing. One consists of the
introduction of a second Higgs doublet which is neutral under S. The second
scenario consists of assuming New Physics at a high energy scale , contributing
to the masses of light quark generations, in an effective field theory
approach. This last scenario leads to couplings of the Higgs particle to
$s\overline s$ and $c \overline c$ which are significantly enhanced with
respect to those of the SM. In both schemes, one has scalar-mediated flavour-
changing neutral currents which are naturally suppressed. Flavour violating top
decays are predicted in the second scenario at the level $ \mbox{Br} (t
\rightarrow h c ) \geq 5\times 10^{-5}$.
| [
{
"created": "Thu, 25 Feb 2016 17:50:23 GMT",
"version": "v1"
}
] | 2017-01-04 | [
[
"Botella",
"F. J.",
""
],
[
"Branco",
"G. C.",
""
],
[
"Rebelo",
"M. N.",
""
],
[
"Silva-Marcos",
"J. I.",
""
]
] | We point out that, in the context of the SM, $|V^2_{13}| + | V^2_{23}|$ is expected to be large, of order one. The fact that $|V^2_{13}| + |V^2_{23}| \approx 1.6 \times 10^{-3}$ motivates the introduction of a symmetry S which leads to $V_{CKM} ={1\>\!\!\!\mathrm{I}} $, with only the third generation of quarks acquiring mass. We consider two scenarios for generating the mass of the first two quark generations and full quark mixing. One consists of the introduction of a second Higgs doublet which is neutral under S. The second scenario consists of assuming New Physics at a high energy scale , contributing to the masses of light quark generations, in an effective field theory approach. This last scenario leads to couplings of the Higgs particle to $s\overline s$ and $c \overline c$ which are significantly enhanced with respect to those of the SM. In both schemes, one has scalar-mediated flavour- changing neutral currents which are naturally suppressed. Flavour violating top decays are predicted in the second scenario at the level $ \mbox{Br} (t \rightarrow h c ) \geq 5\times 10^{-5}$. |
1105.5274 | Marco Frasca | Marco Frasca | Chiral symmetry in the low-energy limit of QCD at finite temperature | 17 pages, 4 figures. Version accepted for publication in Physical
Review C. Thanks a lot to the referee for the excellent review work | Phys. Rev. C 84, 055208 (2011) | 10.1103/PhysRevC.84.055208 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a non-local Nambu-Jona-Lasinio model from QCD with a form factor
exactly obtained in the infrared limit. With this model, having all the
parameters properly fixed through those of QCD, we consider the case of finite
temperature and compute the solution of the gap equation at small temperature
and small momenta and zero chemical potential. Taking the quark masses to be
zero, it is proved that the theory undergoes a phase transition with a critical
temperature exactly determined. These results prove unequivocally that the
picture of the vacuum of QCD as a liquid of instantons is a very good
approximation.
| [
{
"created": "Thu, 26 May 2011 13:15:48 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2011 11:01:18 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jul 2011 14:35:26 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Nov 2011 17:09:21 GMT",
"version": "v4"
}
] | 2015-03-19 | [
[
"Frasca",
"Marco",
""
]
] | We derive a non-local Nambu-Jona-Lasinio model from QCD with a form factor exactly obtained in the infrared limit. With this model, having all the parameters properly fixed through those of QCD, we consider the case of finite temperature and compute the solution of the gap equation at small temperature and small momenta and zero chemical potential. Taking the quark masses to be zero, it is proved that the theory undergoes a phase transition with a critical temperature exactly determined. These results prove unequivocally that the picture of the vacuum of QCD as a liquid of instantons is a very good approximation. |
hep-ph/0611144 | Joseph Conlon | Joseph P. Conlon, Daniel Cremades | The Neutrino Suppression Scale from Large Volumes | 4 pages, RevTeX; v2. matches journal version | Phys.Rev.Lett.99:041803,2007 | 10.1103/PhysRevLett.99.041803 | DAMTP-2006-110 | hep-ph hep-th | null | We present an argument in which the scale ~ 0.1 eV associated with neutrino
masses naturally appears in a a class of (very) large volume compactifications,
being tied to a supersymmetry scale of 10^3 GeV and a string scale of 10^11
GeV. The masses are of Majorana type and there is no right-handed neutrino
within the low-energy field theory. The suppression scale 10^14 GeV is
independent of the masses of the heavy states that are integrated out. These
kind of constructions appear naturally in Type IIB flux compactifications.
However, the arguments that lead to this result rely only on a few geometrical
features of the compactification manifold, and hence can be used independently
of string theory.
| [
{
"created": "Fri, 10 Nov 2006 15:17:26 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Aug 2007 15:38:05 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Conlon",
"Joseph P.",
""
],
[
"Cremades",
"Daniel",
""
]
] | We present an argument in which the scale ~ 0.1 eV associated with neutrino masses naturally appears in a a class of (very) large volume compactifications, being tied to a supersymmetry scale of 10^3 GeV and a string scale of 10^11 GeV. The masses are of Majorana type and there is no right-handed neutrino within the low-energy field theory. The suppression scale 10^14 GeV is independent of the masses of the heavy states that are integrated out. These kind of constructions appear naturally in Type IIB flux compactifications. However, the arguments that lead to this result rely only on a few geometrical features of the compactification manifold, and hence can be used independently of string theory. |
hep-ph/9710519 | Stefan Hesselbach | S. Hesselbach, F. Franke and H. Fraas | Production of neutralinos in superstring-inspired E_6 models | 7 pages, Latex, including 12 Postscript figures, uses rotating.sty,
amssymb.sty; complete psfile also available at
ftp://ftp.physik.uni-wuerzburg.de/pub/preprint/1997/WUE-ITP-97-042.ps.gz ;
contribution to the proceedings of the "ECFA/DESY Study on Physics and
Detectors for the Linear Collider", DESY 97-123E, ed. R. Settles | null | null | WUE-ITP-97-042 | hep-ph | null | We study the neutralino mass spectra and production cross sections at an
e^+e^- linear collider in superstring-inspired E_6 models. These models are
characterized by the existence of new neutral gauge bosons and singlet Higgs
fields which also lead to an extended neutralino sector compared to the Minimal
Supersymmetric Standard Model (MSSM) or the Next-To-Minimal Supersymmetric
Standard Model (NMSSM). For different E_6 models we develop scenarios with new
light exotic neutralinos which may offer important possibilities to distinguish
between the models.
| [
{
"created": "Wed, 29 Oct 1997 12:12:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hesselbach",
"S.",
""
],
[
"Franke",
"F.",
""
],
[
"Fraas",
"H.",
""
]
] | We study the neutralino mass spectra and production cross sections at an e^+e^- linear collider in superstring-inspired E_6 models. These models are characterized by the existence of new neutral gauge bosons and singlet Higgs fields which also lead to an extended neutralino sector compared to the Minimal Supersymmetric Standard Model (MSSM) or the Next-To-Minimal Supersymmetric Standard Model (NMSSM). For different E_6 models we develop scenarios with new light exotic neutralinos which may offer important possibilities to distinguish between the models. |
hep-ph/0006317 | Jose F. Nieves | Jose F. Nieves and Palash B. Pal | Momentum-dependent contributions to the gravitational coupling of
neutrinos in a medium | Minor corrections in the references; one reference added | Phys.Rev. D63 (2001) 076003 | 10.1103/PhysRevD.63.076003 | null | hep-ph | null | When neutrinos travel through a normal matter medium, the electron neutrinos
couple differently to gravity compared to the other neutrinos, due to the
presence of electrons in the medium and the absence of the other charged
leptons. We calculate the momentum-dependent part of the matter-induced
gravitational couplings of the neutrinos under such conditions, which arise at
order $g^2/M^4_W$, and determine their contribution to the neutrino dispersion
relation in the presence of a gravitational potential $\phi^{\mathrm{ext}}$.
These new contributions vanish for the muon and tau neutrinos. For electron
neutrinos with momentum $K$, they are of the order of the usual Wolfenstein
term times the factor $(K^2/M^2_W)\phi^{\mathrm{ext}}$, for high energy
neutrinos. In environments where the gravitational potential is substantial,
such as those in the vicinity of Active Galactic Nuclei, they could be the
dominant term in the neutrino dispersion relation. They must also be taken into
account in the analysis of possible violations of the Equivalence Principle in
the neutrino sector, in experimental settings involving high energy neutrinos
traveling through a matter background.
| [
{
"created": "Wed, 28 Jun 2000 14:33:33 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2000 15:07:42 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Nieves",
"Jose F.",
""
],
[
"Pal",
"Palash B.",
""
]
] | When neutrinos travel through a normal matter medium, the electron neutrinos couple differently to gravity compared to the other neutrinos, due to the presence of electrons in the medium and the absence of the other charged leptons. We calculate the momentum-dependent part of the matter-induced gravitational couplings of the neutrinos under such conditions, which arise at order $g^2/M^4_W$, and determine their contribution to the neutrino dispersion relation in the presence of a gravitational potential $\phi^{\mathrm{ext}}$. These new contributions vanish for the muon and tau neutrinos. For electron neutrinos with momentum $K$, they are of the order of the usual Wolfenstein term times the factor $(K^2/M^2_W)\phi^{\mathrm{ext}}$, for high energy neutrinos. In environments where the gravitational potential is substantial, such as those in the vicinity of Active Galactic Nuclei, they could be the dominant term in the neutrino dispersion relation. They must also be taken into account in the analysis of possible violations of the Equivalence Principle in the neutrino sector, in experimental settings involving high energy neutrinos traveling through a matter background. |
1008.4322 | Kenji Fukushima | Kenji Fukushima | Effective Model Approach to the Dense State of QCD Matter | 8 pages, 4 figures; Talk at International Workshop on High Density
Nuclear Matter, Cape Town, South Africa, April 6-9, 2010 | null | 10.1134/S1547477111080097 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first-principle approach to the dense state of QCD matter, i.e. the
lattice-QCD simulation at finite baryon density, is not under theoretical
control for the moment. The effective model study based on QCD symmetries is a
practical alternative. However the model parameters that are fixed by hadronic
properties in the vacuum may have unknown dependence on the baryon chemical
potential. We propose a new prescription to constrain the effective model
parameters by the matching condition with the thermal Statistical Model. In the
transitional region where thermal quantities blow up in the Statistical Model,
deconfined quarks and gluons should smoothly take over the relevant degrees of
freedom from hadrons and resonances. We use the Polyakov-loop coupled
Nambu--Jona-Lasinio (PNJL) model as an effective description in the quark side
and show how the matching condition is satisfied by a simple ansatz on the
Polyakov loop potential. Our results favor a phase diagram with the chiral
phase transition located at slightly higher temperature than deconfinement
which stays close to the chemical freeze-out points.
| [
{
"created": "Wed, 25 Aug 2010 17:53:04 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Fukushima",
"Kenji",
""
]
] | The first-principle approach to the dense state of QCD matter, i.e. the lattice-QCD simulation at finite baryon density, is not under theoretical control for the moment. The effective model study based on QCD symmetries is a practical alternative. However the model parameters that are fixed by hadronic properties in the vacuum may have unknown dependence on the baryon chemical potential. We propose a new prescription to constrain the effective model parameters by the matching condition with the thermal Statistical Model. In the transitional region where thermal quantities blow up in the Statistical Model, deconfined quarks and gluons should smoothly take over the relevant degrees of freedom from hadrons and resonances. We use the Polyakov-loop coupled Nambu--Jona-Lasinio (PNJL) model as an effective description in the quark side and show how the matching condition is satisfied by a simple ansatz on the Polyakov loop potential. Our results favor a phase diagram with the chiral phase transition located at slightly higher temperature than deconfinement which stays close to the chemical freeze-out points. |
hep-ph/0306202 | Dzhunushaliev Vladimir | V. Dzhunushaliev and D. Singleton | Effective 't Hooft-Polyakov monopoles from pure SU(3) gauge theory | one error is corrected | Mod.Phys.Lett. A18 (2003) 2873-2886 | 10.1142/S0217732303012441 | null | hep-ph hep-th | null | The well known topological monopoles originally investigated by 't Hooft and
Polyakov are known to arise in classical Yang-Mills-Higgs theory. With a pure
gauge theory it is known that the classical Yang-Mills field equation do not
have such finite energy configurations. Here we argue that such configurations
may arise in a semi-quantized Yang-Mills theory, where the original gauge
group, SU(3), is reduced to a smaller gauge group, SU(2), and with some
combination of the coset fields of the SU(3) to SU(2) reduction acting as
effective scalar fields. The procedure is called semi-quantized since some of
the original gauge fields are treated as quantum degrees of freedom, while
others are postulated to be effectively described as classical degrees of
freedom. Some speculation is offer on a possible connection between these
monopole configurations and the confinement problem, and the nucleon spin
puzzle.
| [
{
"created": "Sun, 22 Jun 2003 11:39:41 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2003 03:53:24 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Nov 2004 07:00:24 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Dzhunushaliev",
"V.",
""
],
[
"Singleton",
"D.",
""
]
] | The well known topological monopoles originally investigated by 't Hooft and Polyakov are known to arise in classical Yang-Mills-Higgs theory. With a pure gauge theory it is known that the classical Yang-Mills field equation do not have such finite energy configurations. Here we argue that such configurations may arise in a semi-quantized Yang-Mills theory, where the original gauge group, SU(3), is reduced to a smaller gauge group, SU(2), and with some combination of the coset fields of the SU(3) to SU(2) reduction acting as effective scalar fields. The procedure is called semi-quantized since some of the original gauge fields are treated as quantum degrees of freedom, while others are postulated to be effectively described as classical degrees of freedom. Some speculation is offer on a possible connection between these monopole configurations and the confinement problem, and the nucleon spin puzzle. |
1911.06967 | Zhen-Hua Zhang | Ya Gao, Yateng Zhang, Bo Zheng, Zhen-Hua Zhang, Wenbiao Yan, Xiaohua
Li | Evaluation of the $\theta_K$ and the Mixing angle $\theta _{h_1}$ | 6 pages, with no figure | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\theta_K$ has been re-evaluated via mass relations and latest
experimental results, meanwhile, the $M_{K_{1B}}$ also be obtained. Based on
the singlet-octet mixing model and quark-flavor mixing model, the
$\theta_{h_1}$ has been recalculated with a modified formula, by inputting
$M_{K_{1B}}$ instead of $\theta_K$. The values are calculated to be $|{\theta
_K}| = {(42.6 \pm 2.2)^ \circ }$, $M_{K_{1B}} = 1333.9 \pm 4.6\
{\rm{MeV}}/c^{2}$ and $\theta _{h_1} = 29.5\pm 2.0^\circ$. Using these
calculations as input, we predict that the branching fraction of $J/\psi \to
\eta'(\eta)h_1(1170)$ is about one order higher than that of $J/\psi \to
\eta'(\eta)h_1(1415)$, which can be measured in future experiments to test the
validity of these two models.
| [
{
"created": "Sat, 16 Nov 2019 05:57:16 GMT",
"version": "v1"
}
] | 2019-11-19 | [
[
"Gao",
"Ya",
""
],
[
"Zhang",
"Yateng",
""
],
[
"Zheng",
"Bo",
""
],
[
"Zhang",
"Zhen-Hua",
""
],
[
"Yan",
"Wenbiao",
""
],
[
"Li",
"Xiaohua",
""
]
] | The $\theta_K$ has been re-evaluated via mass relations and latest experimental results, meanwhile, the $M_{K_{1B}}$ also be obtained. Based on the singlet-octet mixing model and quark-flavor mixing model, the $\theta_{h_1}$ has been recalculated with a modified formula, by inputting $M_{K_{1B}}$ instead of $\theta_K$. The values are calculated to be $|{\theta _K}| = {(42.6 \pm 2.2)^ \circ }$, $M_{K_{1B}} = 1333.9 \pm 4.6\ {\rm{MeV}}/c^{2}$ and $\theta _{h_1} = 29.5\pm 2.0^\circ$. Using these calculations as input, we predict that the branching fraction of $J/\psi \to \eta'(\eta)h_1(1170)$ is about one order higher than that of $J/\psi \to \eta'(\eta)h_1(1415)$, which can be measured in future experiments to test the validity of these two models. |
hep-ph/9209269 | null | Adam F. Falk and Matthias Neubert | Second Order Power Corrections in the Heavy Quark Effective Theory II.
Baryon Form Factors | (18 pages, REVTEX), SLAC-PUB-5898 | Phys.Rev.D47:2982-2990,1993 | 10.1103/PhysRevD.47.2982 | null | hep-ph | null | The analysis of $1/m_Q^2$ corrections of the previous paper is extended to
the semileptonic decays of heavy baryons. We focus on the simplest case, the
ground state $\Lambda_Q$ baryons, in which the light degrees of freedom are in
a state of zero total angular momentum. The formalism, while identical in
spirit, is considerably less cumbersome than for heavy mesons. The general
results are applied to the semileptonic decay
$\Lambda_b\to\Lambda_c\,\ell\,\nu$. An estimate of the leading power
corrections to the decay rate at zero recoil, which are of order $1/m_Q^2$, is
presented. It is pointed out that a measurement of certain asymmetry parameters
would provide a direct measurement of $1/m_Q^2$ corrections. Finally, it is
shown how the analysis could be extended to include excited heavy baryons such
as the $\Sigma_Q$ and the $\Sigma_Q^*$.
| [
{
"created": "Wed, 23 Sep 1992 17:27:00 GMT",
"version": "v1"
}
] | 2011-05-05 | [
[
"Falk",
"Adam F.",
""
],
[
"Neubert",
"Matthias",
""
]
] | The analysis of $1/m_Q^2$ corrections of the previous paper is extended to the semileptonic decays of heavy baryons. We focus on the simplest case, the ground state $\Lambda_Q$ baryons, in which the light degrees of freedom are in a state of zero total angular momentum. The formalism, while identical in spirit, is considerably less cumbersome than for heavy mesons. The general results are applied to the semileptonic decay $\Lambda_b\to\Lambda_c\,\ell\,\nu$. An estimate of the leading power corrections to the decay rate at zero recoil, which are of order $1/m_Q^2$, is presented. It is pointed out that a measurement of certain asymmetry parameters would provide a direct measurement of $1/m_Q^2$ corrections. Finally, it is shown how the analysis could be extended to include excited heavy baryons such as the $\Sigma_Q$ and the $\Sigma_Q^*$. |
hep-ph/9808498 | G. Brooijmans | G. Brooijmans | A Supersymmetric Solution to the Solar and Atmospheric Neutrino
Anomalies | 6 pages, 1 figure Modifications: include limit from tau -> rho mu
(leads to somewhat different conclusions) and a change to the figure | null | null | null | hep-ph | null | The formalism for neutrino flavor change induced by lepton family number
violating interactions is developed for the three-neutrino case, and used to
derive the corresponding flavor change probabilities in matter. Applied to the
solar and atmospheric neutrino fluxes, it is argued that the observed
anomalies, including the zenith dependence for the atmospheric case, could be
due to such interactions.
| [
{
"created": "Mon, 31 Aug 1998 22:59:37 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Nov 1998 18:36:53 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Brooijmans",
"G.",
""
]
] | The formalism for neutrino flavor change induced by lepton family number violating interactions is developed for the three-neutrino case, and used to derive the corresponding flavor change probabilities in matter. Applied to the solar and atmospheric neutrino fluxes, it is argued that the observed anomalies, including the zenith dependence for the atmospheric case, could be due to such interactions. |
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