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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2201.04840 | Luis Roca | L. R. Dai, E. Oset, A. Feijoo, R. Molina, L. Roca, A. Mart\'inez
Torres, K. P. Khemchandani | Masses and widths of the exotic molecular $B_{(s)}^{(*)} B_{(s)}^{(*)}$
states | 23 pages, 10 figures | null | 10.1103/PhysRevD.105.074017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the interaction of the doubly bottom systems $BB$, $B^* B$, $B_s B$,
$B_s^* B$, $B^* B^*$, $B^* B_s$, $B^*B_s^*$, $B_s B_s$, $B_s B_s^*$, $B_s^*
B_s^*$ by means of vector meson exchange with Lagrangians from an extension of
the local hidden gauge approach. The full s-wave scattering matrix is obtained
implementing unitarity in coupled channels by means of the Bethe-Salpeter
equation. We find poles below the channel thresholds for the attractively
interacting channels $B^* B$ in $I=0$, $B^*_s B-B^*B_s$ in $I=\frac{1}{2}$,
$B^* B^*$ in $I=0$, and $B^*_s B^*$ in $I=\frac{1}{2}$, all of them with
$J^P=1^+$. For these cases the widths are evaluated identifyng the dominant
source of imaginary part. We find binding energies of the order of $10-20$ MeV,
and the widths vary much from one system to the other: of the order of 10-100
eV for the $B^* B$ system and $B^*_s B-B^*B_s$, about $6$ MeV for the $B^* B^*$
system and of the order of $0.5$ MeV for the $B^*_s B^*$ system.
| [
{
"created": "Thu, 13 Jan 2022 08:59:03 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Dai",
"L. R.",
""
],
[
"Oset",
"E.",
""
],
[
"Feijoo",
"A.",
""
],
[
"Molina",
"R.",
""
],
[
"Roca",
"L.",
""
],
[
"Torres",
"A. Martínez",
""
],
[
"Khemchandani",
"K. P.",
""
]
] | We study the interaction of the doubly bottom systems $BB$, $B^* B$, $B_s B$, $B_s^* B$, $B^* B^*$, $B^* B_s$, $B^*B_s^*$, $B_s B_s$, $B_s B_s^*$, $B_s^* B_s^*$ by means of vector meson exchange with Lagrangians from an extension of the local hidden gauge approach. The full s-wave scattering matrix is obtained implementing unitarity in coupled channels by means of the Bethe-Salpeter equation. We find poles below the channel thresholds for the attractively interacting channels $B^* B$ in $I=0$, $B^*_s B-B^*B_s$ in $I=\frac{1}{2}$, $B^* B^*$ in $I=0$, and $B^*_s B^*$ in $I=\frac{1}{2}$, all of them with $J^P=1^+$. For these cases the widths are evaluated identifyng the dominant source of imaginary part. We find binding energies of the order of $10-20$ MeV, and the widths vary much from one system to the other: of the order of 10-100 eV for the $B^* B$ system and $B^*_s B-B^*B_s$, about $6$ MeV for the $B^* B^*$ system and of the order of $0.5$ MeV for the $B^*_s B^*$ system. |
1402.7078 | Johannes Henn | Johannes M. Henn, Kirill Melnikov, Vladimir A. Smirnov | Two-loop planar master integrals for the production of off-shell vector
bosons in hadron collisions | 28 pages, many figures; ancillary files included with arXiv
submission | null | 10.1007/s13130-014-8200-x | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the calculation of all planar master integrals that are needed
for the computation of NNLO QCD corrections to the production of two off-shell
vector bosons in hadron collisions. The most complicated representatives of
integrals in this class are the two-loop four-point functions where two
external lines are on the light-cone and two other external lines have
different invariant masses. We compute these and other relevant integrals
analytically using differential equations in external kinematic variables and
express our results in terms of Goncharov polylogarithms. The case of two equal
off-shellnesses, recently considered in Ref. [1], appears as a particular case
of our general solution.
| [
{
"created": "Thu, 27 Feb 2014 21:00:22 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Henn",
"Johannes M.",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Smirnov",
"Vladimir A.",
""
]
] | We describe the calculation of all planar master integrals that are needed for the computation of NNLO QCD corrections to the production of two off-shell vector bosons in hadron collisions. The most complicated representatives of integrals in this class are the two-loop four-point functions where two external lines are on the light-cone and two other external lines have different invariant masses. We compute these and other relevant integrals analytically using differential equations in external kinematic variables and express our results in terms of Goncharov polylogarithms. The case of two equal off-shellnesses, recently considered in Ref. [1], appears as a particular case of our general solution. |
hep-ph/9408241 | Mark Hindmarsh | Mark Hindmarsh | Sphalerons and Strings | (6pp, LaTeX + 3 eps figures, self-unpacking uuencoded. Needs
epsf.sty.) SUSX-TH-94/71 | null | null | null | hep-ph | null | This work is based on a paper with Margaret James, to appear in Phys Rev D.
In it we showed that the dipole moment of the sphaleron has its origin in two
components: a ring of electric current circulating around the edge of the
sphaleron; and also two regions of opposite magnetic charge above and below the
ring. This magnetic charge has a partly topological explanation, arising from
the fact that the sphaleron is axisymmetric and parity invariant. Here, I
discuss the definition of the electromagnetic field and its sources in the
Standard Model, comparing the one we use with the better-known one of 't Hooft.
I also discuss the resemblance between the sphaleron and Nambu's ``dumb-bell''
-- a segment of $Z$-string which connects a monopole to an antimonopole.
| [
{
"created": "Fri, 5 Aug 1994 13:59:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hindmarsh",
"Mark",
""
]
] | This work is based on a paper with Margaret James, to appear in Phys Rev D. In it we showed that the dipole moment of the sphaleron has its origin in two components: a ring of electric current circulating around the edge of the sphaleron; and also two regions of opposite magnetic charge above and below the ring. This magnetic charge has a partly topological explanation, arising from the fact that the sphaleron is axisymmetric and parity invariant. Here, I discuss the definition of the electromagnetic field and its sources in the Standard Model, comparing the one we use with the better-known one of 't Hooft. I also discuss the resemblance between the sphaleron and Nambu's ``dumb-bell'' -- a segment of $Z$-string which connects a monopole to an antimonopole. |
hep-ph/0308189 | Vadim Guzey | L. Frankfurt (Tel Aviv U.), V. Guzey (TP2, Ruhr U.), M. Strikman (Penn
State U.) | Leading twist coherent diffraction on nuclei in deep inelastic
scattering at small x and nuclear shadowing | 14 pages, 7 figures. Extended discussion. Final version published in
PLB | Phys.Lett. B586 (2004) 41-52 | 10.1016/j.physletb.2004.02.019 | RUB-TP2-11/03 | hep-ph | null | We extend the theory of leading twist nuclear shadowing to calculate leading
twist nuclear diffractive parton distribution functions (nDPDFs). We observe
that the quark and gluon nPDFs have different patterns of the $A$-dependence.
It is found that the probability of diffraction in the quark channel
increases with $A$, reaching about 30% at $x \sim 10^{-4}$ for $A \sim 200$,
and weakly decreases with $Q^2$. In the gluon channel, the probability of
diffraction is large for all nuclei ($\sim 40$% for heavy nuclei at $x \sim
10^{-4}$ and $Q_0^2 \sim 4$ GeV$^2$), it weakly depends on $A$ and it decreases
rather fast with increasing $Q^2$ -- the probability decreases by approximately
a factor of two as $Q^2$ changes from 4 GeV$^2$ to 100 GeV$^2$. We also find
that nuclear shadowing breaks down Regge factorization of nDPDFs, which is
satisfied experimentally in the nucleon case. All these novel effects in nDPDFs
are large enough to be straightforwardly measured in ultraperipheral collisions
at the LHC.
| [
{
"created": "Tue, 19 Aug 2003 09:21:56 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 2004 13:36:18 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Frankfurt",
"L.",
"",
"Tel Aviv U."
],
[
"Guzey",
"V.",
"",
"TP2, Ruhr U."
],
[
"Strikman",
"M.",
"",
"Penn\n State U."
]
] | We extend the theory of leading twist nuclear shadowing to calculate leading twist nuclear diffractive parton distribution functions (nDPDFs). We observe that the quark and gluon nPDFs have different patterns of the $A$-dependence. It is found that the probability of diffraction in the quark channel increases with $A$, reaching about 30% at $x \sim 10^{-4}$ for $A \sim 200$, and weakly decreases with $Q^2$. In the gluon channel, the probability of diffraction is large for all nuclei ($\sim 40$% for heavy nuclei at $x \sim 10^{-4}$ and $Q_0^2 \sim 4$ GeV$^2$), it weakly depends on $A$ and it decreases rather fast with increasing $Q^2$ -- the probability decreases by approximately a factor of two as $Q^2$ changes from 4 GeV$^2$ to 100 GeV$^2$. We also find that nuclear shadowing breaks down Regge factorization of nDPDFs, which is satisfied experimentally in the nucleon case. All these novel effects in nDPDFs are large enough to be straightforwardly measured in ultraperipheral collisions at the LHC. |
hep-ph/0007298 | Tim Tait | Tim M.P. Tait, C.-P. Yuan | Single Top Production as a Window to Physics Beyond the Standard Model | References added and minor discussion improvements; results
unchanged; Version to be published in PRD | Phys.Rev.D63:014018,2000 | 10.1103/PhysRevD.63.014018 | ANL-HEP-PR-98-124 CERN-TH/2000-224 | hep-ph | null | Production of single top quarks at a high energy hadron collider is studied
as a means to identify physics beyond the standard model related to the
electroweak symmetry breaking. The sensitivity of the $s$-channel $W^*$ mode,
the $t$-channel $W$-gluon fusion mode, and the \tw mode to various possible
forms of new physics is assessed, and it is found that the three modes are
sensitive to different forms of new physics, indicating that they provide
complimentary information about the properties of the top quark. Polarization
observables are also considered, and found to provide potentially useful
information about the structure of the interactions of top.
| [
{
"created": "Wed, 26 Jul 2000 15:52:46 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2000 21:46:00 GMT",
"version": "v2"
}
] | 2010-11-24 | [
[
"Tait",
"Tim M. P.",
""
],
[
"Yuan",
"C. -P.",
""
]
] | Production of single top quarks at a high energy hadron collider is studied as a means to identify physics beyond the standard model related to the electroweak symmetry breaking. The sensitivity of the $s$-channel $W^*$ mode, the $t$-channel $W$-gluon fusion mode, and the \tw mode to various possible forms of new physics is assessed, and it is found that the three modes are sensitive to different forms of new physics, indicating that they provide complimentary information about the properties of the top quark. Polarization observables are also considered, and found to provide potentially useful information about the structure of the interactions of top. |
0902.0628 | Bohdan Grzadkowski | Bohdan Grzadkowski, Jose Wudka | Pragmatic approach to the little hierarchy problem: the case for Dark
Matter and neutrino physics | discussion of multi singlet case added | Phys.Rev.Lett.103:091802,2009 | 10.1103/PhysRevLett.103.091802 | IFT-09-01, UCRHEP-T463 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the addition of real scalars (gauge singlets) to the Standard
Model can both ameliorate the little hierarchy problem and provide realistic
Dark Matter candidates. To this end, the coupling of the new scalars to the
standard Higgs boson must be relatively strong and their mass should be in the
1-3 TeV range, while the lowest cutoff of the (unspecified) UV completion must
be >~ 5 TeV, depending on the Higgs boson mass and the number of singlets
present. The existence of the singlets also leads to realistic and surprisingly
reach neutrino physics. The resulting light neutrino mass spectrum and mixing
angles are consistent with the constraints from the neutrino oscillations.
| [
{
"created": "Tue, 3 Feb 2009 21:52:30 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Mar 2009 16:44:09 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Aug 2009 16:34:51 GMT",
"version": "v3"
}
] | 2010-04-23 | [
[
"Grzadkowski",
"Bohdan",
""
],
[
"Wudka",
"Jose",
""
]
] | We show that the addition of real scalars (gauge singlets) to the Standard Model can both ameliorate the little hierarchy problem and provide realistic Dark Matter candidates. To this end, the coupling of the new scalars to the standard Higgs boson must be relatively strong and their mass should be in the 1-3 TeV range, while the lowest cutoff of the (unspecified) UV completion must be >~ 5 TeV, depending on the Higgs boson mass and the number of singlets present. The existence of the singlets also leads to realistic and surprisingly reach neutrino physics. The resulting light neutrino mass spectrum and mixing angles are consistent with the constraints from the neutrino oscillations. |
2306.07865 | Kristjan Kannike | Kristjan Kannike, Aleksei Kubarski, Luca Marzola and Antonio Racioppi | Pseudo-Goldstone dark matter in a radiative inverse seesaw scenario | 31 pages, 3 figures, version published in JHEP, typos corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a scale-invariant inverse seesaw model with dynamical breaking of
gauge symmetry and lepton number. In some regions of the parameter space, the
Majoron - the pseudo-Goldstone of lepton number breaking - is a viable dark
matter candidate. The bound on the Majoron decay rate implies a very large
dilaton vacuum expectation value, which also results in a suppression of other
dark matter couplings. Because of that, the observed dark matter relic
abundance can only be matched via the freeze-in mechanism. The scalar field
which gives mass to heavy neutrinos can play the role of the inflaton,
resulting in a tensor-to-scalar ratio $r \lesssim 0.01$ for metric inflation
and $r \lesssim 0.21$ for Palatini gravity.
| [
{
"created": "Tue, 13 Jun 2023 15:50:10 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2023 18:04:25 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jan 2024 11:33:35 GMT",
"version": "v3"
}
] | 2024-01-09 | [
[
"Kannike",
"Kristjan",
""
],
[
"Kubarski",
"Aleksei",
""
],
[
"Marzola",
"Luca",
""
],
[
"Racioppi",
"Antonio",
""
]
] | We consider a scale-invariant inverse seesaw model with dynamical breaking of gauge symmetry and lepton number. In some regions of the parameter space, the Majoron - the pseudo-Goldstone of lepton number breaking - is a viable dark matter candidate. The bound on the Majoron decay rate implies a very large dilaton vacuum expectation value, which also results in a suppression of other dark matter couplings. Because of that, the observed dark matter relic abundance can only be matched via the freeze-in mechanism. The scalar field which gives mass to heavy neutrinos can play the role of the inflaton, resulting in a tensor-to-scalar ratio $r \lesssim 0.01$ for metric inflation and $r \lesssim 0.21$ for Palatini gravity. |
0705.2791 | Shunzo Kumano | M. Hirai, S. Kumano, T.-H. Nagai, and K. Sudoh | Global analysis for determining fragmentation functions and their
uncertainties in light hadrons | 4 pages, LaTeX, 6 eps files, to be published in proceedings of 42nd
Rencontres de Moriond on QCD and high energy hadronic interactions, La
Thuile, Italy, 17-24 Mar 2007. A code for calculating the fragmentation
functions and their uncertainties can be obtained from
http://research.kek.jp/people/kumanos/ffs.html | null | null | KEK-TH-1146 | hep-ph hep-ex nucl-ex nucl-th | null | Fragmentation functions are determined for the pion, kaon, and proton by
analyzing charged-hadron production data in electron-positron annihilation. It
is important that uncertainties of the determined fragmentation functions are
estimated in this analysis. Analysis results indicate that gluon and
light-quark functions have large uncertainties especially at small Q^2. We find
that next-to-leading-order (NLO) uncertainties are significantly reduced in
comparison with leading-order (LO) ones in the pion and kaon. The fragmentation
functions are very different in various analysis groups. However, all the
recent functions are roughly within the estimated uncertainties, which
indicates that they are consistent with each other. We provide a code for
calculating the fragmentation functions and their uncertainties at a given
kinematical point of z and Q^2 by a user.
| [
{
"created": "Sat, 19 May 2007 01:12:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hirai",
"M.",
""
],
[
"Kumano",
"S.",
""
],
[
"Nagai",
"T. -H.",
""
],
[
"Sudoh",
"K.",
""
]
] | Fragmentation functions are determined for the pion, kaon, and proton by analyzing charged-hadron production data in electron-positron annihilation. It is important that uncertainties of the determined fragmentation functions are estimated in this analysis. Analysis results indicate that gluon and light-quark functions have large uncertainties especially at small Q^2. We find that next-to-leading-order (NLO) uncertainties are significantly reduced in comparison with leading-order (LO) ones in the pion and kaon. The fragmentation functions are very different in various analysis groups. However, all the recent functions are roughly within the estimated uncertainties, which indicates that they are consistent with each other. We provide a code for calculating the fragmentation functions and their uncertainties at a given kinematical point of z and Q^2 by a user. |
hep-ph/0201296 | Stanley J. Brodsky | Stanley J. Brodsky, Dae Sung Hwang, and Ivan Schmidt | Final-State Interactions and Single-Spin Asymmetries in Semi-Inclusive
Deep Inelastic Scattering | Version to appear in Physics Letters B. Typographical errors
corrected in Eqs. (13) and (14) | Phys.Lett.B530:99-107,2002 | 10.1016/S0370-2693(02)01320-5 | SLAC-PUB-9135, USM-TH-121 | hep-ph | null | Recent measurements from the HERMES and SMC collaborations show a remarkably
large azimuthal single-spin asymmetries A_{UL} and A_{UT} of the proton in
semi-inclusive pion leptoproduction. We show that final-state interactions from
gluon exchange between the outgoing quark and the target spectator system lead
to single-spin asymmetries in deep inelastic lepton-proton scattering at
leading twist in perturbative QCD; i.e., the rescattering corrections are not
power-law suppressed at large photon virtuality Q^2 at fixed x_{bj}. The
existence of such single-spin asymmetries requires a phase difference between
two amplitudes coupling the proton target with J^z_p = + 1/2 and -1/2 to the
same final state, the same amplitudes which are necessary to produce a nonzero
proton anomalous magnetic moment. We show that the exchange of gauge particles
between the outgoing quark and the proton spectators produces a Coulomb-like
complex phase which depends on the angular momentum L_z of the proton's
constituents and is thus distinct for different proton spin amplitudes. The
single-spin asymmetry which arises from such final-state interactions does not
factorize into a product of distribution function and fragmentation function,
and it is not related to the transversity distribution delta q(x,Q) which
correlates transversely polarized quarks with the spin of the transversely
polarized target nucleon.
| [
{
"created": "Thu, 31 Jan 2002 00:58:08 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Feb 2002 23:13:21 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"Hwang",
"Dae Sung",
""
],
[
"Schmidt",
"Ivan",
""
]
] | Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries A_{UL} and A_{UT} of the proton in semi-inclusive pion leptoproduction. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system lead to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality Q^2 at fixed x_{bj}. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with J^z_p = + 1/2 and -1/2 to the same final state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb-like complex phase which depends on the angular momentum L_z of the proton's constituents and is thus distinct for different proton spin amplitudes. The single-spin asymmetry which arises from such final-state interactions does not factorize into a product of distribution function and fragmentation function, and it is not related to the transversity distribution delta q(x,Q) which correlates transversely polarized quarks with the spin of the transversely polarized target nucleon. |
hep-ph/9408254 | Per Elmfors | Per Elmfors, Randy Kobes | The Thermal Beta-Function in Yang-Mills Theory | 16pp,latex + epsf.sty, Nordita-94/36 P | Phys. Rev. D 51, 774 (1995) | 10.1103/PhysRevD.51.774 | null | hep-ph hep-th | null | Previous calculations of the thermal beta-function in a hot Yang--Mills gas
at the one--loop level have exposed problems with the gauge dependence and with
the sign, which is opposite to what one would expect for asymptotic freedom. We
show that inclusion of higher--loop effects through a static Braaten--Pisarski
resummation is necessary to consistently obtain the leading term, but alters
the results only quantitatively. The sign, in particular, remains the same. We
also explore, by a crude parameterization, the effects a (non--perturbative)
magnetic mass may have on these results.
| [
{
"created": "Tue, 9 Aug 1994 09:01:46 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Elmfors",
"Per",
""
],
[
"Kobes",
"Randy",
""
]
] | Previous calculations of the thermal beta-function in a hot Yang--Mills gas at the one--loop level have exposed problems with the gauge dependence and with the sign, which is opposite to what one would expect for asymptotic freedom. We show that inclusion of higher--loop effects through a static Braaten--Pisarski resummation is necessary to consistently obtain the leading term, but alters the results only quantitatively. The sign, in particular, remains the same. We also explore, by a crude parameterization, the effects a (non--perturbative) magnetic mass may have on these results. |
2306.15460 | Jo\~ao Pedro Pino Gon\c{c}alves | Jo\~ao Gon\c{c}alves and Ant\'onio P. Morais and Ant\'onio Onofre and
Roman Pasechnik | Exploring mixed lepton-quark interactions in non-resonant leptoquark
production at the LHC | v1: 26 pages; 8 figures; 4 tables; v2: Additional discussion and
references | null | null | CERN-TH-2023-072 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Searches for new physics (NP) at particle colliders typically involve
multivariate analysis of kinematic distributions of final state particles
produced in a decay of a hypothetical NP resonance. Since the pair-production
cross-sections mediated by such resonances are strongly suppressed by the NP
scale, this analysis becomes less relevant for NP searches for masses of the
BSM resonance above 1 TeV. On the other hand, $t$-channel processes are less
sensitive to the mass of the virtual mediator and therefore larger phase-space
can be potentially probed as well as the couplings between the NP particles and
the Standard Model fields. The fact that transitions between different
generations of quarks and leptons may exist, the potential of the search
presented in this article can be used, as a reference guide, to enlarge
significantly the scope of searches performed at the LHC to flavour
off-diagonal channels, in a theoretically consistent approach. In this work, we
study non-resonant production of scalar leptoquarks which have been proposed in
the literature to provide a potential avenue for radiative generation of
neutrino masses, accommodating as well the existing flavour physics data. Final
states involving just two muons at the LHC ($\mu^+, \mu^-$), are used as a
well-motivated case study.
| [
{
"created": "Tue, 27 Jun 2023 13:25:15 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2023 20:04:19 GMT",
"version": "v2"
}
] | 2023-08-31 | [
[
"Gonçalves",
"João",
""
],
[
"Morais",
"António P.",
""
],
[
"Onofre",
"António",
""
],
[
"Pasechnik",
"Roman",
""
]
] | Searches for new physics (NP) at particle colliders typically involve multivariate analysis of kinematic distributions of final state particles produced in a decay of a hypothetical NP resonance. Since the pair-production cross-sections mediated by such resonances are strongly suppressed by the NP scale, this analysis becomes less relevant for NP searches for masses of the BSM resonance above 1 TeV. On the other hand, $t$-channel processes are less sensitive to the mass of the virtual mediator and therefore larger phase-space can be potentially probed as well as the couplings between the NP particles and the Standard Model fields. The fact that transitions between different generations of quarks and leptons may exist, the potential of the search presented in this article can be used, as a reference guide, to enlarge significantly the scope of searches performed at the LHC to flavour off-diagonal channels, in a theoretically consistent approach. In this work, we study non-resonant production of scalar leptoquarks which have been proposed in the literature to provide a potential avenue for radiative generation of neutrino masses, accommodating as well the existing flavour physics data. Final states involving just two muons at the LHC ($\mu^+, \mu^-$), are used as a well-motivated case study. |
hep-ph/9501250 | Axel de la Macorra P. | Axel de la Macorra | Vanishing of the Cosmological Constant, Stability of the Dilaton and
Inflation | 9 pages, LaTeX, 3 figures compressed and uuencoded | Int.J.Mod.Phys. D5 (1996) 567 | null | IFUNAM-FT-94-64 | hep-ph astro-ph hep-th | null | We study the possibility of canceling the cosmological constant in
supergravity string models. We show that with a suitable choice of
superpotential the vacuum energy may vanish with the dilaton field at its
minimum and supersymmetry broken with a large hierarchy. We derive the
condition for which the introduction of a chiral potential, e.g. the inflaton
potential, does not destabilize the dilaton field even in the region where the
scalar potential takes positive values. This allows for an inflationary
potential with the dilaton frozen at its minimum.
| [
{
"created": "Tue, 10 Jan 1995 01:49:51 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"de la Macorra",
"Axel",
""
]
] | We study the possibility of canceling the cosmological constant in supergravity string models. We show that with a suitable choice of superpotential the vacuum energy may vanish with the dilaton field at its minimum and supersymmetry broken with a large hierarchy. We derive the condition for which the introduction of a chiral potential, e.g. the inflaton potential, does not destabilize the dilaton field even in the region where the scalar potential takes positive values. This allows for an inflationary potential with the dilaton frozen at its minimum. |
1710.09683 | C\'edric Weiland | Julien Baglio and Cedric Weiland | Impact of heavy sterile neutrinos on the triple Higgs coupling | 6+1 pages, 3 figures, proceedings of EPS-HEP 2017, the European
Physical Society conference on High Energy Physics, 5-12 July 2017, Venice,
Italy | null | null | IPPP/17/77 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New physics beyond the Standard Model is required to give mass to the light
neutrinos. One of the simplest ideas is to introduce new heavy, gauge singlet
fermions that play the role of right-handed neutrinos in a seesaw mechanism.
They could have large Yukawa couplings to the Higgs boson, affecting the Higgs
couplings and in particular the triple Higgs coupling $\lambda_{HHH}^{}$, the
measure of which is one of the major goals of the LHC and of future colliders.
We present a study of the impact of these heavy neutrinos on $\lambda_{HHH}^{}$
at the one-loop level, first in a simplified 3+1 model with one heavy Dirac
neutrino and then in the inverse seesaw model. Taking into account all possible
experimental constraints, we find that sizeable deviations of the order of 35%
are possible, large enough to be detected at future colliders, making the
triple Higgs coupling a new, viable observable to constrain neutrino mass
models. The effects are generic and are expected in any new physics model
including TeV-scale fermions with large Yukawa couplings to the Higgs boson,
such as those using the neutrino portal.
| [
{
"created": "Thu, 26 Oct 2017 13:24:54 GMT",
"version": "v1"
}
] | 2017-10-27 | [
[
"Baglio",
"Julien",
""
],
[
"Weiland",
"Cedric",
""
]
] | New physics beyond the Standard Model is required to give mass to the light neutrinos. One of the simplest ideas is to introduce new heavy, gauge singlet fermions that play the role of right-handed neutrinos in a seesaw mechanism. They could have large Yukawa couplings to the Higgs boson, affecting the Higgs couplings and in particular the triple Higgs coupling $\lambda_{HHH}^{}$, the measure of which is one of the major goals of the LHC and of future colliders. We present a study of the impact of these heavy neutrinos on $\lambda_{HHH}^{}$ at the one-loop level, first in a simplified 3+1 model with one heavy Dirac neutrino and then in the inverse seesaw model. Taking into account all possible experimental constraints, we find that sizeable deviations of the order of 35% are possible, large enough to be detected at future colliders, making the triple Higgs coupling a new, viable observable to constrain neutrino mass models. The effects are generic and are expected in any new physics model including TeV-scale fermions with large Yukawa couplings to the Higgs boson, such as those using the neutrino portal. |
hep-ph/9907230 | Uma Mahanta | Uma Mahanta | Violation of supersymmetric equivalence in R parity violating couplings | Plain Tex, 7 pages, no figures | Phys.Rev. D61 (2000) 015012 | 10.1103/PhysRevD.61.015012 | MRI-PHY/P990718 | hep-ph | null | In this paper we consider the violation of supersymmetric equvalence among
the R parity violating couplings $lamabda_{ijk}$ caused by widely split chiral
supermultiplets. We find that if $\lambda^{\prime}_{2jk}=g$ and
$\lambda^{\prime}_{1jk}=e$ then the violation of SUSY equivalence is of the
order of $5-6%$ in heavy SQCD models. On the other hand if
$\lambda^{\prime}_{3jk}=g$ and $\lambda_{ijk}=e$ then the violation of SUSY
equivalence can be as large as 9.4% in 2-1 models.
| [
{
"created": "Mon, 5 Jul 1999 12:41:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mahanta",
"Uma",
""
]
] | In this paper we consider the violation of supersymmetric equvalence among the R parity violating couplings $lamabda_{ijk}$ caused by widely split chiral supermultiplets. We find that if $\lambda^{\prime}_{2jk}=g$ and $\lambda^{\prime}_{1jk}=e$ then the violation of SUSY equivalence is of the order of $5-6%$ in heavy SQCD models. On the other hand if $\lambda^{\prime}_{3jk}=g$ and $\lambda_{ijk}=e$ then the violation of SUSY equivalence can be as large as 9.4% in 2-1 models. |
2112.14275 | Nikolaos Syrrakos | Dhimiter D. Canko and Nikolaos Syrrakos | Planar three-loop master integrals for $2 \to 2$ processes with one
external massive particle | v2: added appendix on adjacency conditions, added ancillary files,
version accepted for publication in JHEP; v1: 17 pages, 1 figure | null | 10.1007/JHEP04(2022)134 | TUM-HEP-1385/21 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present analytic results for the two tennis-court integral families
relevant to $2\to2$ scattering processes involving one massive external
particle and massless propagators in terms of Goncharov polylogarithms of up to
transcendental weight six. We also present analytic results for physical
kinematics for the ladder-box family and the two tennis-court families in terms
of real-valued polylogarithmic functions, making our solutions well-suited for
phenomenological applications.
| [
{
"created": "Tue, 28 Dec 2021 19:19:40 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2022 20:29:39 GMT",
"version": "v2"
}
] | 2022-05-11 | [
[
"Canko",
"Dhimiter D.",
""
],
[
"Syrrakos",
"Nikolaos",
""
]
] | We present analytic results for the two tennis-court integral families relevant to $2\to2$ scattering processes involving one massive external particle and massless propagators in terms of Goncharov polylogarithms of up to transcendental weight six. We also present analytic results for physical kinematics for the ladder-box family and the two tennis-court families in terms of real-valued polylogarithmic functions, making our solutions well-suited for phenomenological applications. |
1708.08350 | Nikolaos Mavromatos | Nick E. Mavromatos (King's College London) | Matter-Antimatter Asymmetry in the Universe via String-Inspired CPT
Violation at Early Eras | 6 pages Latex, one figure, uses special macros; Invited talk at the
International Workshop on CPT and Lorentz Symmetry in Field Theory,
University of the Algarve, Faro (Portugal), July 6-7 2017. To appear in the
Proceedings (Journal of Phys. Conf. Series (IOP)) | null | 10.1088/1742-6596/952/1/012006 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In four-space-time dimensional string/brane theory, obtained either through
compactification of the extra spatial dimensions, or by appropriate restriction
to brane worlds with three large spatial dimensions, the rich physics potential
associated with the presence of non-trivial Kalb-Ramond (KR) axion-like fields
has not been fully exploited so far. In this talk, I discuss a scenario whereby
such fields produce spontaneous Lorentz- and CPT-violating cosmological
backgrounds over which strings propagate, which in the early Universe can lead
to Baryogenesis through Leptogenesis in models with heavy right-handed
neutrinos.
| [
{
"created": "Mon, 28 Aug 2017 14:44:06 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Mavromatos",
"Nick E.",
"",
"King's College London"
]
] | In four-space-time dimensional string/brane theory, obtained either through compactification of the extra spatial dimensions, or by appropriate restriction to brane worlds with three large spatial dimensions, the rich physics potential associated with the presence of non-trivial Kalb-Ramond (KR) axion-like fields has not been fully exploited so far. In this talk, I discuss a scenario whereby such fields produce spontaneous Lorentz- and CPT-violating cosmological backgrounds over which strings propagate, which in the early Universe can lead to Baryogenesis through Leptogenesis in models with heavy right-handed neutrinos. |
hep-ph/9602368 | Shoichi Sasaki Rcnp | Hideo Suganuma(RCNP), Sei Umisedo(RCNP), Shoich Sasaki(RCNP), Hiroshi
Toki(RCNP), Osamu Miyamura(Hiroshima Univ.) | Monopole Dominance for Nonperturbative QCD | Talk presented by H. Suganuma at the Joint Japan-Australia Workshop
on "Quarks, Hadrons and Nuclei'', 15 - 24 Nov. 1995, in Adelaide, Australia,
10 pages, Plain Latex, ( 6 figures - available on request from
ssasaki@rcnp.osaka-u.ac.jp ) | Austral.J.Phys.50:233-243,1997 | 10.1071/P96045 | null | hep-ph | null | Monopole dominance for the nonperturbative features in QCD is studied both in
the continuum and the lattice gauge theories. First, we study the dynamical
chiral-symmetry breaking (D$\chi $SB) in the dual Higgs theory using the
effective potential formalism. We find that the main driving force for D$\chi
$SB is brought from the confinement part in the nonperturbative gluon
propagator rather than the short-range part, which means monopole dominance for
D$\chi $SB. Second, the correlation between instantons and QCD-monopoles is
studied. In the Polyakov-like gauge, where $A_4(x)$ is diagonalized, the
QCD-monopole trajectory penetrates the center of each instanton, and becomes
complicated in the multi-instanton system. Finally, using the SU(2) lattice
gauge theory with $16^4$ and $16^3 \times 4$, the instanton number is measured
in the singular (monopole-dominating) and regular (photon-dominating) sectors,
respectively. Instantons and anti-instantons only exist in the monopole sector
both in the maximally abelian gauge and in the Polyakov gauge, which means
monopole dominance for the topological charge.
| [
{
"created": "Thu, 22 Feb 1996 13:17:06 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Suganuma",
"Hideo",
"",
"RCNP"
],
[
"Umisedo",
"Sei",
"",
"RCNP"
],
[
"Sasaki",
"Shoich",
"",
"RCNP"
],
[
"Toki",
"Hiroshi",
"",
"RCNP"
],
[
"Miyamura",
"Osamu",
"",
"Hiroshima Univ."
]
] | Monopole dominance for the nonperturbative features in QCD is studied both in the continuum and the lattice gauge theories. First, we study the dynamical chiral-symmetry breaking (D$\chi $SB) in the dual Higgs theory using the effective potential formalism. We find that the main driving force for D$\chi $SB is brought from the confinement part in the nonperturbative gluon propagator rather than the short-range part, which means monopole dominance for D$\chi $SB. Second, the correlation between instantons and QCD-monopoles is studied. In the Polyakov-like gauge, where $A_4(x)$ is diagonalized, the QCD-monopole trajectory penetrates the center of each instanton, and becomes complicated in the multi-instanton system. Finally, using the SU(2) lattice gauge theory with $16^4$ and $16^3 \times 4$, the instanton number is measured in the singular (monopole-dominating) and regular (photon-dominating) sectors, respectively. Instantons and anti-instantons only exist in the monopole sector both in the maximally abelian gauge and in the Polyakov gauge, which means monopole dominance for the topological charge. |
0809.3743 | Francesco Murgia | M. Anselmino (1), M. Boglione (1), U. D'Alesio (2,3), E. Leader (4),
S. Melis (1), F. Murgia (3) ((1) University and INFN, Torino, Italy, (2)
University of Cagliari (Italy), (3) INFN, Cagliari, Italy, (4) Imperial
College, London, U.K.) | Sivers and Collins effects in polarized pp scattering processes | 8 pages, 10 eps figures, uses ws-procs9x6.cls; Talk presented by F.
Murgia at the II International Workshop on Transverse Polarisation Phenomena
in Hard Processes (Transversity 2008), May 28-31, 2008, Ferrara (Italy) | null | 10.1142/9789814277785_0015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the present phenomenology of Sivers and Collins effects for
transverse single spin asymmetries in polarized proton-proton collisions within
the framework of the generalized parton model (GPM). We will discuss a
reassessment of the Collins effect and some preliminary predictions for SSA's
in p(pol) p -> pi,K + X processes at RHIC obtained using updated information
from SIDIS data and a new set of meson fragmentation functions.
| [
{
"created": "Mon, 22 Sep 2008 16:43:34 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Leader",
"E.",
""
],
[
"Melis",
"S.",
""
],
[
"Murgia",
"F.",
""
]
] | We summarize the present phenomenology of Sivers and Collins effects for transverse single spin asymmetries in polarized proton-proton collisions within the framework of the generalized parton model (GPM). We will discuss a reassessment of the Collins effect and some preliminary predictions for SSA's in p(pol) p -> pi,K + X processes at RHIC obtained using updated information from SIDIS data and a new set of meson fragmentation functions. |
2003.04057 | Leonid Slad | L.M.Slad | Consequences of the MSW mechanism with Super-Kamiokande oscillation
parameters and of the volume distribution of neutrino sources in the Sun | 8 pages, v2: Additions: Erroneous assertions at the base of the MSW
mechanism | EPL 135 (2021) 61002 | 10.1209/0295-5075/ac32f4 | null | hep-ph astro-ph.SR hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The knowledge of the parameters of the solar neutrino oscillation model,
provided by the SNO and Super-Kamiokande collaborations, enables us to obtain,
with the Wolfenstein equation, a simple and clear analytical and numerical
picture of the transformation of the neutrino state during its travel inside
the Sun. We show that the resulting picture is not implicated in the
characteristics of the neutrino state at the surface of the Sun and at the
surface of the Earth. This circumstance with taking into account the volume
distribution of solar neutrino sources indicates an obvious contradiction
between the consequences of the MSW mechanism with parameters from SNO and
Super-Kamiokande and the results of three of the five observed processes with
solar neutrinos. Erroneous assertions at the base of the MSW mechanism are
noted.
| [
{
"created": "Mon, 9 Mar 2020 12:14:51 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2021 14:09:49 GMT",
"version": "v2"
}
] | 2021-12-14 | [
[
"Slad",
"L. M.",
""
]
] | The knowledge of the parameters of the solar neutrino oscillation model, provided by the SNO and Super-Kamiokande collaborations, enables us to obtain, with the Wolfenstein equation, a simple and clear analytical and numerical picture of the transformation of the neutrino state during its travel inside the Sun. We show that the resulting picture is not implicated in the characteristics of the neutrino state at the surface of the Sun and at the surface of the Earth. This circumstance with taking into account the volume distribution of solar neutrino sources indicates an obvious contradiction between the consequences of the MSW mechanism with parameters from SNO and Super-Kamiokande and the results of three of the five observed processes with solar neutrinos. Erroneous assertions at the base of the MSW mechanism are noted. |
1203.5012 | Anders Tranberg | Anders Tranberg and Bin Wu | Cold Electroweak Baryogenesis in the Two Higgs-Doublet Model | 20 pages, 18 figures | null | 10.1007/JHEP07(2012)087 | BI-TP 2012/11 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the first investigation of cold electroweak baryogenesis in the
two Higgs-doublet model (2HDM). The electroweak symmetry breaking transition is
assumed to occur through a spinodal instability from a super-cooled initial
state. We consider the creation of net Chern-Simons number, which through the
axial anomaly is equivalent to baryon number. CP-violation is explicit in the
scalar potential, but only in combination with P-violation is it possible for
an asymmetry to be generated. This is introduced through the leading C- and
P-breaking, but CP-invariant, term expected to arise upon integrating out the
fermions in the theory. We perform real-time lattice simulations of the
transition, and find the coefficient of this term required for successful
bayogenesis.
| [
{
"created": "Thu, 22 Mar 2012 15:06:20 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Tranberg",
"Anders",
""
],
[
"Wu",
"Bin",
""
]
] | We perform the first investigation of cold electroweak baryogenesis in the two Higgs-doublet model (2HDM). The electroweak symmetry breaking transition is assumed to occur through a spinodal instability from a super-cooled initial state. We consider the creation of net Chern-Simons number, which through the axial anomaly is equivalent to baryon number. CP-violation is explicit in the scalar potential, but only in combination with P-violation is it possible for an asymmetry to be generated. This is introduced through the leading C- and P-breaking, but CP-invariant, term expected to arise upon integrating out the fermions in the theory. We perform real-time lattice simulations of the transition, and find the coefficient of this term required for successful bayogenesis. |
1701.00725 | Mario Prausa | Mario Prausa | epsilon: A tool to find a canonical basis of master integrals | 34 pages; changed reference to fuchsia | Comp.Phys.Commun. 219 (2017) 361-376 | 10.1016/j.cpc.2017.05.026 | TTK-17-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2013, Henn proposed a special basis for a certain class of master
integrals, which are expressible in terms of iterated integrals. In this basis,
the master integrals obey a differential equation, where the right hand side is
proportional to $\epsilon$ in $d=4-2\epsilon$ space-time dimensions. An
algorithmic approach to find such a basis was found by Lee. We present the tool
epsilon, an efficient implementation of Lee's algorithm based on the Fermat
computer algebra system as computational backend.
| [
{
"created": "Tue, 3 Jan 2017 15:36:18 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2017 18:44:53 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jun 2017 09:53:30 GMT",
"version": "v3"
}
] | 2017-07-26 | [
[
"Prausa",
"Mario",
""
]
] | In 2013, Henn proposed a special basis for a certain class of master integrals, which are expressible in terms of iterated integrals. In this basis, the master integrals obey a differential equation, where the right hand side is proportional to $\epsilon$ in $d=4-2\epsilon$ space-time dimensions. An algorithmic approach to find such a basis was found by Lee. We present the tool epsilon, an efficient implementation of Lee's algorithm based on the Fermat computer algebra system as computational backend. |
2007.01501 | Seyed Peyman Zakeri | Zahra Rezaei, S. Peyman Zakeri | Singlet scalar dark matter in the non-commutative space-time: a viable
hypothesis to explain the gamma-ray excess in the galactic center | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the non-commutative space-time to revive the idea that gamma-ray
excess in the galactic center can be the result of particle dark matter
annihilation. In the non-commutative theory, the photon spectrum is produced by
direct emission during this annihilation where a photon can be embed in the
final state together with other direct products in new vertices. In the various
configurations of dark matter phenomenology, we adopt the most common model
known as singlet scalar. Calculating the relevant aspects of the model, we can
obtain the photon flux in the galactic center. Comparing our numerical
achievements with experimental data reveals that non-commutative space-time can
be a reliable framework to explain the gamma-ray excess.
| [
{
"created": "Fri, 3 Jul 2020 05:22:44 GMT",
"version": "v1"
}
] | 2020-07-06 | [
[
"Rezaei",
"Zahra",
""
],
[
"Zakeri",
"S. Peyman",
""
]
] | We explore the non-commutative space-time to revive the idea that gamma-ray excess in the galactic center can be the result of particle dark matter annihilation. In the non-commutative theory, the photon spectrum is produced by direct emission during this annihilation where a photon can be embed in the final state together with other direct products in new vertices. In the various configurations of dark matter phenomenology, we adopt the most common model known as singlet scalar. Calculating the relevant aspects of the model, we can obtain the photon flux in the galactic center. Comparing our numerical achievements with experimental data reveals that non-commutative space-time can be a reliable framework to explain the gamma-ray excess. |
1012.1022 | Jean-Marc Richard | Jean-Marc Richard | Non-Abelian dynamics and heavy multiquarks, Steiner-tree confinement in
hadron spectroscopy | 8 pages, 5 figures, Invited talk at the 21st European Conference on
Few-Body Problems in Physics, Salamanca, Spain, August 29th--September 3rd,
2010, to appear in the Proceedings, ed.~A.~Valcarce et al., to appear in
Few-Body System | null | 10.1007/s00601-010-0195-4 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief review is first presented of attempts to predict stable multiquark
states within current models of hadron spectroscopy. Then a model combining
flip-flop and connected Steiner trees is introduced and shown to lead to stable
multiquarks, in particular for some configurations involving several heavy
quarks and bearing exotic quantum numbers.
| [
{
"created": "Sun, 5 Dec 2010 18:14:35 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Richard",
"Jean-Marc",
""
]
] | A brief review is first presented of attempts to predict stable multiquark states within current models of hadron spectroscopy. Then a model combining flip-flop and connected Steiner trees is introduced and shown to lead to stable multiquarks, in particular for some configurations involving several heavy quarks and bearing exotic quantum numbers. |
1304.3776 | Sadataka Furui | Sadataka Furui | Axial anomaly and the triality symmetry of leptons and hadrons | 24 pages, 24 figures, References and comments added, to be published
in Few-Body Systems(Springer) | null | 10.1007/s00601-014-0897-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the supersymmetric model of \'E. Cartan to the pseudoscalar meson
decay into two photons, $\pi_0\to\gamma\gamma$, $\eta\to\gamma\gamma$ and
$\eta'\to\gamma\gamma$. In the book of \'E. Cartan published in 1966, Dirac
spinors ${^t(}A,B)$ and ${^t(}C,D)$ and vector fields $E$ and $E'$ were
introduced and five supersymmetric transformations $G_{23}, G_{12}, G_{13},
G_{123}$ and $G_{132}$ were considered.
The Pauli spinor is treated as a quaternion and the Dirac spinor is treated
as an octonion. In the pseudoscalar meson decay, when the two final vector
fields belong to the same group ($EE$ or $E'E'$), we call the diagram
rescattering diagram. When they belong to different groups ($EE'$), the diagram
is called twisted diagram.
Assuming the triality selection rules of octonions, dark matter is
interpreted as matter emitting photons in a different triality sector than that
of electromagnetic probes in our world.
| [
{
"created": "Sat, 13 Apr 2013 04:42:15 GMT",
"version": "v1"
},
{
"created": "Sat, 4 May 2013 02:07:45 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Dec 2013 08:55:31 GMT",
"version": "v3"
},
{
"created": "Wed, 25 Jun 2014 14:41:21 GMT",
"version": "v4"
}
] | 2015-06-15 | [
[
"Furui",
"Sadataka",
""
]
] | We apply the supersymmetric model of \'E. Cartan to the pseudoscalar meson decay into two photons, $\pi_0\to\gamma\gamma$, $\eta\to\gamma\gamma$ and $\eta'\to\gamma\gamma$. In the book of \'E. Cartan published in 1966, Dirac spinors ${^t(}A,B)$ and ${^t(}C,D)$ and vector fields $E$ and $E'$ were introduced and five supersymmetric transformations $G_{23}, G_{12}, G_{13}, G_{123}$ and $G_{132}$ were considered. The Pauli spinor is treated as a quaternion and the Dirac spinor is treated as an octonion. In the pseudoscalar meson decay, when the two final vector fields belong to the same group ($EE$ or $E'E'$), we call the diagram rescattering diagram. When they belong to different groups ($EE'$), the diagram is called twisted diagram. Assuming the triality selection rules of octonions, dark matter is interpreted as matter emitting photons in a different triality sector than that of electromagnetic probes in our world. |
1110.5718 | W-Y. P. Hwang | W-Y. Pauchy Hwang | The dark-matter world: Are there dark-matter galaxies? | arXiv admin note: substantial text overlap with arXiv:1107.0156 and
arXiv:1009.1954 | null | 10.1142/S2010194512005703 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt to answer whether neutrinos and antineutrinos, such as those in
the cosmic neutrino background, would clusterize among themselves or even with
other dark-matter particles, under certain time span, say 1 Gyr. With neutrino
masses in place, the similarity with the ordinary matter increases and so is
our confidence for neutrino clustering if time is long enough. In particular,
the clusterings could happen with some seeds (cf. see the text for definition),
the chance in the dark-matter world to form dark-matter galaxies increases. If
the dark-matter galaxies would exist in a time span of 1 Gyr, then they might
even dictate the formation of the ordinary galaxies (i.e. the dark-matter
galaxies get formed first); thus, the implications for the structure of our
Universe would be tremendous.
| [
{
"created": "Wed, 26 Oct 2011 07:18:45 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Hwang",
"W-Y. Pauchy",
""
]
] | We attempt to answer whether neutrinos and antineutrinos, such as those in the cosmic neutrino background, would clusterize among themselves or even with other dark-matter particles, under certain time span, say 1 Gyr. With neutrino masses in place, the similarity with the ordinary matter increases and so is our confidence for neutrino clustering if time is long enough. In particular, the clusterings could happen with some seeds (cf. see the text for definition), the chance in the dark-matter world to form dark-matter galaxies increases. If the dark-matter galaxies would exist in a time span of 1 Gyr, then they might even dictate the formation of the ordinary galaxies (i.e. the dark-matter galaxies get formed first); thus, the implications for the structure of our Universe would be tremendous. |
2307.03768 | Juan Antonio Aguilar-Saavedra | J. A. Aguilar-Saavedra, H. B. C\^amara, F. R. Joaquim, J. F. Seabra | Confronting the 95 GeV excesses within the UN2HDM | LaTeX 17 pages. Added comments, final version in PRD | null | null | IFT-UAM-CSIC-23-86 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the small excesses around 95 GeV found in several searches for a
new scalar in $\gamma \gamma$, $\tau \tau$ and $b \bar b$ final states. Instead
of trying to accommodate them all, as is usually done in the literature, in the
context of a given Standard Model~(SM) extension, we investigate whether it
would be possible that one or two of these excesses correspond to an actual new
scalar, while the remaining ones are merely statistical fluctuations. To this
end, we use as benchmark model the UN2HDM, a SM extension with one scalar
doublet, one scalar singlet, and an extra $\text{U}(1)'$ symmetry, which has
been previously studied in the context of multiboson cascade decays. We show
that most of the possibilities where the excesses in one or two of these
channels disappear in the future can be accommodated by type-I or type-III
UN2HDMs.
| [
{
"created": "Fri, 7 Jul 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2023 09:46:08 GMT",
"version": "v2"
}
] | 2023-10-18 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Câmara",
"H. B.",
""
],
[
"Joaquim",
"F. R.",
""
],
[
"Seabra",
"J. F.",
""
]
] | We consider the small excesses around 95 GeV found in several searches for a new scalar in $\gamma \gamma$, $\tau \tau$ and $b \bar b$ final states. Instead of trying to accommodate them all, as is usually done in the literature, in the context of a given Standard Model~(SM) extension, we investigate whether it would be possible that one or two of these excesses correspond to an actual new scalar, while the remaining ones are merely statistical fluctuations. To this end, we use as benchmark model the UN2HDM, a SM extension with one scalar doublet, one scalar singlet, and an extra $\text{U}(1)'$ symmetry, which has been previously studied in the context of multiboson cascade decays. We show that most of the possibilities where the excesses in one or two of these channels disappear in the future can be accommodated by type-I or type-III UN2HDMs. |
2404.01633 | Hao Yang | Hao Yang, Jun Jiang and Bingwei Long | Doubly heavy hadrons production in ultraperipheral collision | 22 pages, 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the double heavy baryon $\Xi_{QQ'}$ and tetraquark $T_{QQ}$
production through photon-photon and photon-gluon fusion via ultraperipheral
collisions at the LHC and FCC within the framework of nonrelativistic QCD
factorization formalism. Various ion-ion collisions are taken into account, two
cc(bb)-diquark configurations ($[cc(bb),{^3S_1}\mbox{-}\bar{\bm{3}}]$ and
$[cc(bb),{^1S_0}\mbox{-}\bm{6}]$) and four bc-diquark configurations
($[bc,{^3S_1}\mbox{-}\bar{\bm{3}}]$, $[bc,{^3S_1}\mbox{-}\bm{6}]$,
$[bc,{^1S_0}\mbox{-}\bar{\bm{3}}]$ and $[bc,{^1S_0}\mbox{-}\bm{6}]$) are
considered in the calculation. Numerical results indicate that the
$[cc,{^3S_1}\mbox{-}\bar{\bm{3}}]$ diquark provides dominant contribution for
$\Xi_{cc}$ ($T_{cc}$) production, and a considerable number of $\Xi_{cc}$
($T_{cc}$) can be produced. Due to the event topologies for ultraperipheral
collision are very clear, the background from various QCD interactions can be
suppressed, hence the experimental investigation for $\Xi_{cc}$ and $T_{cc}$
are feasible. The productions for $\Xi_{bc/bb}$ are also discussed, leaving
only slightly possibility for $\Xi_{bc}$ through photon-gluon fusion with
ultraperipheral collisions at the FCC.
| [
{
"created": "Tue, 2 Apr 2024 04:36:04 GMT",
"version": "v1"
}
] | 2024-04-03 | [
[
"Yang",
"Hao",
""
],
[
"Jiang",
"Jun",
""
],
[
"Long",
"Bingwei",
""
]
] | We study the double heavy baryon $\Xi_{QQ'}$ and tetraquark $T_{QQ}$ production through photon-photon and photon-gluon fusion via ultraperipheral collisions at the LHC and FCC within the framework of nonrelativistic QCD factorization formalism. Various ion-ion collisions are taken into account, two cc(bb)-diquark configurations ($[cc(bb),{^3S_1}\mbox{-}\bar{\bm{3}}]$ and $[cc(bb),{^1S_0}\mbox{-}\bm{6}]$) and four bc-diquark configurations ($[bc,{^3S_1}\mbox{-}\bar{\bm{3}}]$, $[bc,{^3S_1}\mbox{-}\bm{6}]$, $[bc,{^1S_0}\mbox{-}\bar{\bm{3}}]$ and $[bc,{^1S_0}\mbox{-}\bm{6}]$) are considered in the calculation. Numerical results indicate that the $[cc,{^3S_1}\mbox{-}\bar{\bm{3}}]$ diquark provides dominant contribution for $\Xi_{cc}$ ($T_{cc}$) production, and a considerable number of $\Xi_{cc}$ ($T_{cc}$) can be produced. Due to the event topologies for ultraperipheral collision are very clear, the background from various QCD interactions can be suppressed, hence the experimental investigation for $\Xi_{cc}$ and $T_{cc}$ are feasible. The productions for $\Xi_{bc/bb}$ are also discussed, leaving only slightly possibility for $\Xi_{bc}$ through photon-gluon fusion with ultraperipheral collisions at the FCC. |
2112.04253 | Mattias Sj\"o | Benjamin Alvarez, Johan Bijnens, Mattias Sj\"o | NNLO Positivity Bounds on Chiral Perturbation Theory for a General
Number of Flavours | 94 pages of which 51 in appendices, 31 figures, 2 tables. Version 2
added to reflect changes (mainly clarifications) done prior to publication in
JHEP | null | 10.1007/JHEP03(2022)159 | LU TP 21-50 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present positivity bounds, derived from the principles of analyticity,
unitarity and crossing symmetry, that constrain the low-energy constants of
chiral perturbation theory. Bounds are produced for 2, 3 or more flavours in
meson-meson scattering with equal meson masses, up to and including
next-to-next-to-leading order (NNLO), using the second and higher derivatives
of the amplitude. We enhance the bounds by using the most general isospin
combinations posible (or higher-flavour counterparts thereof) and by
analytically integrating the low-energy range of the discontinuities. In
addition, we present a powerful and general mathematical framework for
efficiently managing large numbers of positivity bounds.
| [
{
"created": "Wed, 8 Dec 2021 12:11:39 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Sep 2022 09:09:07 GMT",
"version": "v2"
}
] | 2022-09-19 | [
[
"Alvarez",
"Benjamin",
""
],
[
"Bijnens",
"Johan",
""
],
[
"Sjö",
"Mattias",
""
]
] | We present positivity bounds, derived from the principles of analyticity, unitarity and crossing symmetry, that constrain the low-energy constants of chiral perturbation theory. Bounds are produced for 2, 3 or more flavours in meson-meson scattering with equal meson masses, up to and including next-to-next-to-leading order (NNLO), using the second and higher derivatives of the amplitude. We enhance the bounds by using the most general isospin combinations posible (or higher-flavour counterparts thereof) and by analytically integrating the low-energy range of the discontinuities. In addition, we present a powerful and general mathematical framework for efficiently managing large numbers of positivity bounds. |
hep-ph/0406278 | Zhe Xu | Zhe Xu and Carsten Greiner | Thermalization of gluons in ultrarelativistic heavy ion collisions by
including three-body interactions in a parton cascade | 121 pages with 55 figures, revised version. Two eps-figures and
comments are added. Formula (54) which has typo in journal version is given
correctly | Phys.Rev. C71 (2005) 064901 | 10.1103/PhysRevC.71.064901 | null | hep-ph nucl-ex nucl-th | null | We develop a new 3+1 dimensional Monte Carlo cascade solving the kinetic
on-shell Boltzmann equations for partons including the inelastic gg <-> ggg
pQCD processes. The back reaction channel is treated -- for the first time --
fully consistently within this scheme. An extended stochastic method is used to
solve the collision integral. The frame dependence and convergency are studied
for a fixed tube with thermal initial conditions. The detailed numerical
analysis shows that the stochastic method is fully covariant and that
convergency is achieved more efficiently than within a standard geometrical
formulation of the collision term, especially for high gluon interaction rates.
The cascade is then applied to simulate parton evolution and to investigate
thermalization of gluons for a central Au+Au collision at RHIC energy. For this
study the initial conditions are assumed to be generated by independent
minijets with p_T > p_0=2 GeV. With that choice it is demonstrated that overall
kinetic equilibration is driven mainly by the inelastic processes and is
achieved on a scale of 1 fm/c. The further evolution of the expanding gluonic
matter in the central region then shows almost an ideal hydrodynamical
behavior. In addition, full chemical equilibration of the gluons follows on a
longer timescale of about 3 fm/c.
| [
{
"created": "Thu, 24 Jun 2004 19:15:09 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2005 10:34:31 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] | We develop a new 3+1 dimensional Monte Carlo cascade solving the kinetic on-shell Boltzmann equations for partons including the inelastic gg <-> ggg pQCD processes. The back reaction channel is treated -- for the first time -- fully consistently within this scheme. An extended stochastic method is used to solve the collision integral. The frame dependence and convergency are studied for a fixed tube with thermal initial conditions. The detailed numerical analysis shows that the stochastic method is fully covariant and that convergency is achieved more efficiently than within a standard geometrical formulation of the collision term, especially for high gluon interaction rates. The cascade is then applied to simulate parton evolution and to investigate thermalization of gluons for a central Au+Au collision at RHIC energy. For this study the initial conditions are assumed to be generated by independent minijets with p_T > p_0=2 GeV. With that choice it is demonstrated that overall kinetic equilibration is driven mainly by the inelastic processes and is achieved on a scale of 1 fm/c. The further evolution of the expanding gluonic matter in the central region then shows almost an ideal hydrodynamical behavior. In addition, full chemical equilibration of the gluons follows on a longer timescale of about 3 fm/c. |
1711.02180 | Tong Li | Yi Cai, Tao Han, Tong Li and Richard Ruiz | Lepton Number Violation: Seesaw Models and Their Collider Tests | 92 pages, 43 figures. Invited Article for the 'Frontiers in Physics'
Research Topic 'The Physics Associated with Neutrino Masses' | Front.in Phys. 6 (2018) 40 | null | PITT-PACC-1712, IPPP/17/74, CoEPP-MN-17-17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Majorana nature of neutrinos is strongly motivated from the theoretical
and phenomenological point of view. A plethora of neutrino mass models, known
collectively as Seesaw models, exist that could generate both a viable neutrino
mass spectrum and mixing pattern. They can also lead to rich, new
phenomenology, including lepton number non-conservation as well as new
particles, that may be observable at collider experiments. It is therefore
vital to search for such new phenomena and the mass scale associated with
neutrino mass generation at high energy colliders. In this review, we consider
a number of representative Seesaw scenarios as phenomenological benchmarks,
including the characteristic Type I, II, and III Seesaw mechanisms, their
extensions and hybridizations, as well as radiative constructions. We present
new and updated predictions for analyses featuring lepton number violation and
expected coverage in the theory parameter space at current and future
colliders. We emphasize new production and decay channels, their
phenomenological relevance and treatment across different facilities in
$e^+e^-$, $e^-p$ and $pp$ collisions, as well as the available Monte Carlo
tools available for studying Seesaw partners in collider environments.
| [
{
"created": "Mon, 6 Nov 2017 21:24:41 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2018 10:26:30 GMT",
"version": "v2"
}
] | 2018-06-04 | [
[
"Cai",
"Yi",
""
],
[
"Han",
"Tao",
""
],
[
"Li",
"Tong",
""
],
[
"Ruiz",
"Richard",
""
]
] | The Majorana nature of neutrinos is strongly motivated from the theoretical and phenomenological point of view. A plethora of neutrino mass models, known collectively as Seesaw models, exist that could generate both a viable neutrino mass spectrum and mixing pattern. They can also lead to rich, new phenomenology, including lepton number non-conservation as well as new particles, that may be observable at collider experiments. It is therefore vital to search for such new phenomena and the mass scale associated with neutrino mass generation at high energy colliders. In this review, we consider a number of representative Seesaw scenarios as phenomenological benchmarks, including the characteristic Type I, II, and III Seesaw mechanisms, their extensions and hybridizations, as well as radiative constructions. We present new and updated predictions for analyses featuring lepton number violation and expected coverage in the theory parameter space at current and future colliders. We emphasize new production and decay channels, their phenomenological relevance and treatment across different facilities in $e^+e^-$, $e^-p$ and $pp$ collisions, as well as the available Monte Carlo tools available for studying Seesaw partners in collider environments. |
hep-ph/0504191 | Alexander Ilyichev | A.Ilyichev, V.Zykunov | Lowest order QED radiative corrections to longitudinally polarized
Moller scattering | 10 pages, 7 figures | Phys.Rev. D72 (2005) 033018 | 10.1103/PhysRevD.72.033018 | null | hep-ph | null | The total lowest-order electromagnetic radiative corrections to the
observables in Moller scattering of longitudinally polarized electrons have
been calculated. The final expressions obtained by the covariant method for the
infrared divergency cancellation are free from any unphysical cut-off
parameters. Since the calculation is carried out within the ultrarelativistic
approximation our result has a compact form that is convenient for computing.
Basing on these expressions the FORTRAN code MERA has been developed. Using
this code the detailed numerical analysis performed under SLAC (E-158) and JLab
kinematic conditions has shown that the radiative corrections are significant
and rather sensitive to the value of the missing mass (inelasticity) cuts.
| [
{
"created": "Thu, 21 Apr 2005 11:14:08 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Sep 2005 19:14:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ilyichev",
"A.",
""
],
[
"Zykunov",
"V.",
""
]
] | The total lowest-order electromagnetic radiative corrections to the observables in Moller scattering of longitudinally polarized electrons have been calculated. The final expressions obtained by the covariant method for the infrared divergency cancellation are free from any unphysical cut-off parameters. Since the calculation is carried out within the ultrarelativistic approximation our result has a compact form that is convenient for computing. Basing on these expressions the FORTRAN code MERA has been developed. Using this code the detailed numerical analysis performed under SLAC (E-158) and JLab kinematic conditions has shown that the radiative corrections are significant and rather sensitive to the value of the missing mass (inelasticity) cuts. |
1605.07360 | Subhadip Mitra | Shashikant R. Dugad, Pankaj Jain, Subhadip Mitra, Prasenjit Sanyal and
Ravindra K. Verma | The top threshold effect in the $\gamma\gamma$ production at the LHC | 7 pages, 6 figures, 1 table. Updated analysis. The version to appear
in EPJC | Eur.Phys.J. C78 (2018) no.9, 715 | 10.1140/epjc/s10052-018-6188-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the top quark threshold contributions to the $\gamma\gamma$
production at the LHC. They appear when the invariant mass of the photon pair,
$M_{\gamma\gamma}$ just exceeds two times the mass of the top quark and induce
some feature in the $M_{\gamma\gamma}$ distribution. We determine the magnitude
of this threshold effect and characterize this feature with a simple empirical
fitting function to show that it is possible to observe this effect at the LHC
in future. We also explore some possible improvements that may enhance its
significance.
| [
{
"created": "Tue, 24 May 2016 10:17:18 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2016 04:34:24 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Mar 2018 07:36:13 GMT",
"version": "v3"
},
{
"created": "Fri, 24 Aug 2018 06:10:41 GMT",
"version": "v4"
}
] | 2018-09-13 | [
[
"Dugad",
"Shashikant R.",
""
],
[
"Jain",
"Pankaj",
""
],
[
"Mitra",
"Subhadip",
""
],
[
"Sanyal",
"Prasenjit",
""
],
[
"Verma",
"Ravindra K.",
""
]
] | We compute the top quark threshold contributions to the $\gamma\gamma$ production at the LHC. They appear when the invariant mass of the photon pair, $M_{\gamma\gamma}$ just exceeds two times the mass of the top quark and induce some feature in the $M_{\gamma\gamma}$ distribution. We determine the magnitude of this threshold effect and characterize this feature with a simple empirical fitting function to show that it is possible to observe this effect at the LHC in future. We also explore some possible improvements that may enhance its significance. |
hep-ph/9909288 | Cohen Iuliana | Gideon Alexander and Iuliana Cohen | The Source Size Dependence on the M_hadron Applying Fermi and Bose
Statistics and I-Spin Invariance | 7 pages, 4 figures, Based on an invited talk given by G. Alexander at
the XXIX Int. Symp. on Multiparticle Dynamics, 9-13 August 1999, Providence
RI, USA. (to be published in the proceedings of this conference) | null | null | TAUP-2598-99 | hep-ph | null | The emission volume sizes of pions and Kaons, r_{\pi^\pm \pi^\pm} and
r_{K^\pm K^\pm}, measured in the hadronic Z^0 decays via the Bose-Einstein
Correlations (BEC), and the recent measurements of r_{\Lambda\Lambda} obtained
by through the Pauli exclusion principle are used to study the r dependence on
the hadron mass. A clear r_{\pi^\pm \pi^\pm} > r_{K^\pm K^\pm} > r_{\Lambda
\Lambda} hierarchy is observed which seems to disagree with the basic string
(LUND) model expectation. An adequate description of r(m) is obtained via the
Heisenberg uncertainty relations and also by Local Parton Hadron Duality
approach using a general QCD potential. These lead to a relation of the type
r(m) ~ Constant/sqrt{m}.
The present lack of knowledge on the f_o(980) decay rate to the K^0\bar{K}^0
channel prohibits the use of the r_{K^0_SK^0_S} in the r(m) analysis. The use
of a generalised BEC and I-spin invariance, which predicts an BEC enhancement
also in the K^{\pm}K^0 and \pi^{\pm}\pi^0 systems, should in the future help to
include the r_{K^0_SK^0_S} in the r(m) analysis.
| [
{
"created": "Wed, 8 Sep 1999 14:27:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alexander",
"Gideon",
""
],
[
"Cohen",
"Iuliana",
""
]
] | The emission volume sizes of pions and Kaons, r_{\pi^\pm \pi^\pm} and r_{K^\pm K^\pm}, measured in the hadronic Z^0 decays via the Bose-Einstein Correlations (BEC), and the recent measurements of r_{\Lambda\Lambda} obtained by through the Pauli exclusion principle are used to study the r dependence on the hadron mass. A clear r_{\pi^\pm \pi^\pm} > r_{K^\pm K^\pm} > r_{\Lambda \Lambda} hierarchy is observed which seems to disagree with the basic string (LUND) model expectation. An adequate description of r(m) is obtained via the Heisenberg uncertainty relations and also by Local Parton Hadron Duality approach using a general QCD potential. These lead to a relation of the type r(m) ~ Constant/sqrt{m}. The present lack of knowledge on the f_o(980) decay rate to the K^0\bar{K}^0 channel prohibits the use of the r_{K^0_SK^0_S} in the r(m) analysis. The use of a generalised BEC and I-spin invariance, which predicts an BEC enhancement also in the K^{\pm}K^0 and \pi^{\pm}\pi^0 systems, should in the future help to include the r_{K^0_SK^0_S} in the r(m) analysis. |
hep-ph/0703107 | Yukihiro Mimura | Ilia Gogoladze, Chin-Aik Lee, Yukihiro Mimura and Qaisar Shafi | Yukawa Couplings in a Model with Gauge, Higgs and Matter Unification | 12 pages | Phys.Lett.B649:212-217,2007 | 10.1016/j.physletb.2007.03.042 | MIFP-07-07 | hep-ph | null | We discuss how unification of the gauge, Higgs and (three chiral family)
matter superfields can be realized from the compactification of a six
dimensional supersymmetric SU(8) gauge theory over the orbifold R^4 x T^2/Z_3.
The bulk gauge interaction includes Yukawa interactions to generate masses for
quarks and leptons after the electroweak symmetry is broken. The Yukawa
matrices in this case turn out to be antisymmetric, and thus not
phenomenologically viable. To overcome this we introduce brane fields which are
vector-like under the standard model gauge symmetry, and so do not alter the
number of chiral families. In such a setup, the observed fermion masses and
mixings can be realized by taking into account suppression effects from the
effective Wilson line couplings and large volume of the extra dimensions.
| [
{
"created": "Fri, 9 Mar 2007 20:46:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gogoladze",
"Ilia",
""
],
[
"Lee",
"Chin-Aik",
""
],
[
"Mimura",
"Yukihiro",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We discuss how unification of the gauge, Higgs and (three chiral family) matter superfields can be realized from the compactification of a six dimensional supersymmetric SU(8) gauge theory over the orbifold R^4 x T^2/Z_3. The bulk gauge interaction includes Yukawa interactions to generate masses for quarks and leptons after the electroweak symmetry is broken. The Yukawa matrices in this case turn out to be antisymmetric, and thus not phenomenologically viable. To overcome this we introduce brane fields which are vector-like under the standard model gauge symmetry, and so do not alter the number of chiral families. In such a setup, the observed fermion masses and mixings can be realized by taking into account suppression effects from the effective Wilson line couplings and large volume of the extra dimensions. |
hep-ph/0410331 | Kang Young Lee | C.S. Kim (Yonsei U.), Yeong Gyun Kim (Korea U.), and Kang Young Lee
(KAIST) | Implication of the weak phase $\beta$ measured in $B \to \rho \gamma$
decay | 4 pages, talk given at the 32nd International Conference on High
Energy Physics (ICHEP'04), Beijing, China, 16-22 Aug. 2004 | null | 10.1142/9789812702227_0159 | KAIST-TH 2004/08 | hep-ph | null | We explore the exclusive $ B^0 \to \rho^0 \gamma$ decay to obtain the
time-dependent CP asymmetry in $b \to d \gamma$ decay process. We find that the
complex RL and RR mass insertion to the squark sector in the MSSM can lead to a
large deviation of CP asymmetry from that predicted in the Standard Model.
| [
{
"created": "Mon, 25 Oct 2004 12:46:30 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kim",
"C. S.",
"",
"Yonsei U."
],
[
"Kim",
"Yeong Gyun",
"",
"Korea U."
],
[
"Lee",
"Kang Young",
"",
"KAIST"
]
] | We explore the exclusive $ B^0 \to \rho^0 \gamma$ decay to obtain the time-dependent CP asymmetry in $b \to d \gamma$ decay process. We find that the complex RL and RR mass insertion to the squark sector in the MSSM can lead to a large deviation of CP asymmetry from that predicted in the Standard Model. |
2207.13044 | Shahin Atashbar Tehrani | Fatemeh Arbabifar, Shahin Atashbar Tehrani | The effect of light sea quark symmetry breaking on polarized nucleus and
sum rules | 4 pages, 2 figures ,41st International Conference on High Energy
physics - ICHEP2022,6-13 July 2022,Bologna, Italy | PoS(ICHEP2022)1170 | 10.22323/1.414.1170 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The polarized structure functions of $^3He$ and $^3H$ nuclei are calculated
in NLO approximation, considering and disregarding the light sea quark symmetry
breaking. We employ the polarized structure function of the nucleons within the
nucleus extracted from our two recent analysis on polarized DIS data and on
polarized DIS+SIDIS data. Since the data of the second analysis cover a bigger
range of Bjorken variable, both SU(2) and SU(3) symmetry breaking is considered
within the analysis. Then we calculate and compare the polarized structures of
nuclei extracted from both scenarios. Also the Bjorken and ELT sum rules are
calculated using the moments of structure functions. The results are compared
with experimental data and the differences are investigated.
| [
{
"created": "Tue, 26 Jul 2022 17:06:20 GMT",
"version": "v1"
}
] | 2022-08-29 | [
[
"Arbabifar",
"Fatemeh",
""
],
[
"Tehrani",
"Shahin Atashbar",
""
]
] | The polarized structure functions of $^3He$ and $^3H$ nuclei are calculated in NLO approximation, considering and disregarding the light sea quark symmetry breaking. We employ the polarized structure function of the nucleons within the nucleus extracted from our two recent analysis on polarized DIS data and on polarized DIS+SIDIS data. Since the data of the second analysis cover a bigger range of Bjorken variable, both SU(2) and SU(3) symmetry breaking is considered within the analysis. Then we calculate and compare the polarized structures of nuclei extracted from both scenarios. Also the Bjorken and ELT sum rules are calculated using the moments of structure functions. The results are compared with experimental data and the differences are investigated. |
1903.10552 | Juan Herrero-Garcia | Juan Herrero-Garcia and Michael A. Schmidt | Neutrino mass models: New classification and model-independent upper
limits on their scale | 10 pages, 1 table, 1 figure; title changed, discussions extended,
figure updated, matches published version in EPJC | null | 10.1140/epjc/s10052-019-7465-1 | SISSA 07/2019/FISI | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model-independent framework to classify and study neutrino mass
models and their phenomenology. The idea is to introduce one particle beyond
the Standard Model which couples to leptons and carries lepton number together
with an operator which violates lepton number by two units and contains this
particle. This allows to study processes which do not violate lepton number,
while still working with an effective field theory. The contribution to
neutrino masses translates to a robust upper bound on the mass of the new
particle. We compare it to the stronger but less robust upper bound from Higgs
naturalness and discuss several lower bounds. Our framework allows to classify
neutrino mass models in \emph{just} 20 categories, further reduced to 14 once
nucleon decay limits are taken into account, and \emph{possibly} to 9 if also
Higgs naturalness considerations and direct searches are considered.
| [
{
"created": "Mon, 25 Mar 2019 19:00:11 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2019 13:05:46 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Herrero-Garcia",
"Juan",
""
],
[
"Schmidt",
"Michael A.",
""
]
] | We propose a model-independent framework to classify and study neutrino mass models and their phenomenology. The idea is to introduce one particle beyond the Standard Model which couples to leptons and carries lepton number together with an operator which violates lepton number by two units and contains this particle. This allows to study processes which do not violate lepton number, while still working with an effective field theory. The contribution to neutrino masses translates to a robust upper bound on the mass of the new particle. We compare it to the stronger but less robust upper bound from Higgs naturalness and discuss several lower bounds. Our framework allows to classify neutrino mass models in \emph{just} 20 categories, further reduced to 14 once nucleon decay limits are taken into account, and \emph{possibly} to 9 if also Higgs naturalness considerations and direct searches are considered. |
2112.06093 | Anna Danilina | A. V. Danilina, N. V. Nikitin | Rare decays of the $B_s-$meson into four charged leptons in the
framework of the Standard Model | null | null | 10.1088/1402-4896/ac7422 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the Standard Model we present new theoretical predictions
for the branching ratios, double and single differential distributions and
forward -- backward leptonic asymmetries for the $\bar B_s \to \mu^+ \mu^- e^+
e^-$ decay. In our consideration we take into account the $\phi(1020)$ --
resonance contribution; the main contributions of four charmonium resonances :
$\psi(3770)$, $\psi(4040)$, $\psi(4160)$ and $\psi(4415)$; $u\bar{u}$ --
resonant contribution from $\rho(770)$ and $\omega(782)$; tails contributions
from $J/\psi$ and $\psi(2S)$ resonances; non -- resonant contribution of the
$b\,\bar{b}$ - pairs, bremsstrahlung and the contribution of the weak
annihilation. We provide the prediction for the branching ratio of $\bar B_s
\to \mu^+ \mu^- e^+ e^-$ decay with and without the $\phi(1020)$ -- resonance
contribution. We use the model of vector meson dominance (VMD) for calculation
of resonances contributions and take into account all substantive terms in
$\bar B_s \to \mu^+ \mu^- e^+ e^-$ amplitude that was not considered in the
previously papers.
| [
{
"created": "Sat, 11 Dec 2021 23:17:18 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Danilina",
"A. V.",
""
],
[
"Nikitin",
"N. V.",
""
]
] | In the framework of the Standard Model we present new theoretical predictions for the branching ratios, double and single differential distributions and forward -- backward leptonic asymmetries for the $\bar B_s \to \mu^+ \mu^- e^+ e^-$ decay. In our consideration we take into account the $\phi(1020)$ -- resonance contribution; the main contributions of four charmonium resonances : $\psi(3770)$, $\psi(4040)$, $\psi(4160)$ and $\psi(4415)$; $u\bar{u}$ -- resonant contribution from $\rho(770)$ and $\omega(782)$; tails contributions from $J/\psi$ and $\psi(2S)$ resonances; non -- resonant contribution of the $b\,\bar{b}$ - pairs, bremsstrahlung and the contribution of the weak annihilation. We provide the prediction for the branching ratio of $\bar B_s \to \mu^+ \mu^- e^+ e^-$ decay with and without the $\phi(1020)$ -- resonance contribution. We use the model of vector meson dominance (VMD) for calculation of resonances contributions and take into account all substantive terms in $\bar B_s \to \mu^+ \mu^- e^+ e^-$ amplitude that was not considered in the previously papers. |
1503.03328 | Joaquim Matias | Sebastien Descotes-Genon, Lars Hofer, Joaquim Matias, Javier Virto | Theoretical status of $B \to K^* \mu^+\mu^-$: The path towards New
Physics | 17 pages, 1 figure. Talk given at the Discrete 2014: Fourth Symposium
on Prospects in the Physics of Discrete Symmetries | null | 10.1088/1742-6596/631/1/012027 | QFET-2015-22 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the status of the analysis of the 4-body angular distribution $B
\to K^*(\to K \pi) \mu^+\mu^-$ using a basis of optimized observables. We
provide a New Physics interpretation of the pattern of deviations observed in
the 1fb$^{-1}$ dataset with the coefficient of the semileptonic operator $O_9$
being the main responsible for this pattern. Also other scenarios involving
more Wilson coefficients are briefly discussed. Further, we present a detailed
description of each of the hadronic uncertainties entering our predictions and
suggest possible tests for alternative hadronic explanations. Our most accurate
SM predictions for the optimized observables in various bins including all
uncertainties are also provided.
| [
{
"created": "Wed, 11 Mar 2015 13:42:09 GMT",
"version": "v1"
}
] | 2015-09-02 | [
[
"Descotes-Genon",
"Sebastien",
""
],
[
"Hofer",
"Lars",
""
],
[
"Matias",
"Joaquim",
""
],
[
"Virto",
"Javier",
""
]
] | We summarize the status of the analysis of the 4-body angular distribution $B \to K^*(\to K \pi) \mu^+\mu^-$ using a basis of optimized observables. We provide a New Physics interpretation of the pattern of deviations observed in the 1fb$^{-1}$ dataset with the coefficient of the semileptonic operator $O_9$ being the main responsible for this pattern. Also other scenarios involving more Wilson coefficients are briefly discussed. Further, we present a detailed description of each of the hadronic uncertainties entering our predictions and suggest possible tests for alternative hadronic explanations. Our most accurate SM predictions for the optimized observables in various bins including all uncertainties are also provided. |
hep-ph/9812296 | Gogberashvili Merab Jakob | Merab Gogberashvili (Tbilisi Institute of Physics) | Hierarchy problem in the shell-Universe model | 2 pages, RevTeX | Int.J.Mod.Phys. D11 (2002) 1635-1638 | 10.1142/S0218271802002992 | null | hep-ph gr-qc hep-th | null | In the model where the Universe is considered as a thin shell expanding in
5-dimensional hyper-space there is a possibility to obtain one scale for
particle theory corresponding to the 5-dimensional cosmological constant and
Universe thickness.
| [
{
"created": "Wed, 9 Dec 1998 15:04:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gogberashvili",
"Merab",
"",
"Tbilisi Institute of Physics"
]
] | In the model where the Universe is considered as a thin shell expanding in 5-dimensional hyper-space there is a possibility to obtain one scale for particle theory corresponding to the 5-dimensional cosmological constant and Universe thickness. |
1603.02203 | Kazuki Sakurai | Marcin Badziak, Marek Olechowski, Stefan Pokorski and Kazuki Sakurai | Interpreting 750 GeV Diphoton Excess in Plain NMSSM | 20 pages, 6 figures, typos have been corrected, a study about the
radiative correction to the Higgs boson mass has been added | null | 10.1016/j.physletb.2016.06.057 | IPPP/16/17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | NMSSM has enough ingredients to explain the diphoton excess at 750 GeV:
singlet-like (pseudo) scalar ($a$) $s$ and higgsinos as heavy vector-like
fermions. We consider the production of the 750 GeV singlet-like pseudo scalar
a from a decay of the doublet-like pseudo scalar $A$, and the subsequent decay
of $a$ into two photons via higgsino loop. We demonstrate that this cascade
decay of the NMSSM Higgs bosons can explain the diphoton excess in the 13 TeV
data consistently with the absence of a significant excess in the 8 TeV data.
| [
{
"created": "Mon, 7 Mar 2016 18:55:15 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2016 23:00:05 GMT",
"version": "v2"
}
] | 2016-08-03 | [
[
"Badziak",
"Marcin",
""
],
[
"Olechowski",
"Marek",
""
],
[
"Pokorski",
"Stefan",
""
],
[
"Sakurai",
"Kazuki",
""
]
] | NMSSM has enough ingredients to explain the diphoton excess at 750 GeV: singlet-like (pseudo) scalar ($a$) $s$ and higgsinos as heavy vector-like fermions. We consider the production of the 750 GeV singlet-like pseudo scalar a from a decay of the doublet-like pseudo scalar $A$, and the subsequent decay of $a$ into two photons via higgsino loop. We demonstrate that this cascade decay of the NMSSM Higgs bosons can explain the diphoton excess in the 13 TeV data consistently with the absence of a significant excess in the 8 TeV data. |
1102.2499 | Mojtaba Mohammadi Najafabadi | S. Batebi, S. M. Etesami and M. Mohammadi Najafabadi | The Angular Correlations in Top Quark Decays in Standard Model
Extensions | 5 figures | Phys.Rev.D83:057502,2011; Publisher-note D83:059901,2011;
Phys.Rev.D83:059901,2011 | 10.1103/PhysRevD.83.057502 10.1103/PhysRevD.83.059901 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CMS collaboration at the CERN-LHC have searched for the $t$-channel
single top quark production using the spin correlation of the $t$-channel. The
signal extraction and cross section measurement relies on the angular
distribution of the charged lepton in the top quark decays, the angle between
the charged lepton momentum and top spin in the top rest frame. The behavior of
the angular distribution is a distinct slope for the t-channel single top
(signal) while it is flat for the backgrounds. In this letter we investigate
the contributions which this spin correlation may receive from a two-Higgs
doublet model, a top-color assisted technicolor (TC2) and the noncommutative
extension of the Standard Model.
| [
{
"created": "Sat, 12 Feb 2011 11:31:12 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Batebi",
"S.",
""
],
[
"Etesami",
"S. M.",
""
],
[
"Najafabadi",
"M. Mohammadi",
""
]
] | The CMS collaboration at the CERN-LHC have searched for the $t$-channel single top quark production using the spin correlation of the $t$-channel. The signal extraction and cross section measurement relies on the angular distribution of the charged lepton in the top quark decays, the angle between the charged lepton momentum and top spin in the top rest frame. The behavior of the angular distribution is a distinct slope for the t-channel single top (signal) while it is flat for the backgrounds. In this letter we investigate the contributions which this spin correlation may receive from a two-Higgs doublet model, a top-color assisted technicolor (TC2) and the noncommutative extension of the Standard Model. |
hep-ph/9502393 | Johan Bijnens | Johan Bijnens (NORDITA) | Chiral Perturbation Theory | 19 pages, 4 postscript figures (included), LaTeX, uses epsf.sty | null | null | NORDITA - 95/12 N,P | hep-ph nucl-th | null | A short overview of the current state of Chiral Perturbation Theory is given.
This includes a description of the basic assumptions, the usefulness of the
external field method is emphasized using a simple lowest order example. Then
at next-to-leading order the determination of the parameters is discussed. We
also present the status of calculations at ${\cal O}(p^6)$. Finally I present
the extension into 3 directions: estimates of the free parameters, inclusion of
nonleptonic weak and electromagnetic interactions, and inclusion of
non-Goldstone fields in the chiral Lagrangian. Invited Talk at the
International Workshop on Nuclear \& Particle Physics ``Chiral Dynamics in
Hadrons \& Nuclei,'' Feb 6 $\sim$ Feb 10, 1995, Seoul, Korea.
| [
{
"created": "Mon, 27 Feb 1995 14:28:16 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Bijnens",
"Johan",
"",
"NORDITA"
]
] | A short overview of the current state of Chiral Perturbation Theory is given. This includes a description of the basic assumptions, the usefulness of the external field method is emphasized using a simple lowest order example. Then at next-to-leading order the determination of the parameters is discussed. We also present the status of calculations at ${\cal O}(p^6)$. Finally I present the extension into 3 directions: estimates of the free parameters, inclusion of nonleptonic weak and electromagnetic interactions, and inclusion of non-Goldstone fields in the chiral Lagrangian. Invited Talk at the International Workshop on Nuclear \& Particle Physics ``Chiral Dynamics in Hadrons \& Nuclei,'' Feb 6 $\sim$ Feb 10, 1995, Seoul, Korea. |
2401.00250 | Guilherme Zeminiani | G. N. Zeminiani, S. L. P. G. Beres, K. Tsushima | In-medium mass shift of two-flavored heavy mesons, $B_c$, $B^*_c$,
$B_s$, $B^*_s$, $D_s$ and $D^*_s$ | 21 pages, 19 figures (39 .eps files for figures), changes:
unnecessary files removed, 1 figure corrected | null | null | LFTC-23-10/83 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | For the first time, we estimate the in-medium mass shift of the two-flavored
heavy mesons $B_c, B_c^*, B_s, B_s^*, D_s$ and $D_s^*$ in symmetric nuclear
matter. The estimates are made by evaluating the lowest order one-loop
self-energies. The enhanced excitations of intermediate state heavy-light
mesons in symmetric nuclear matter are the origin of their negative mass shift.
Our results show that the magnitude of the mass shift for the $B_c$ meson
($\bar{b} c$ or $b \bar{c}$) is larger than those of the $\eta_c (\bar{c} c)$
and $\eta_b (\bar{b} b)$, different from a naive expectation that it would be
in-between of them. While, that of the $B_c^*$ shows the in-between of the
$J/\psi$ and $\Upsilon$. We observe that the lighter vector meson excitation in
each meson self-energy gives a dominant contribution for the corresponding
meson mass shift, $B_c, B_s,$ and $D_s$.
| [
{
"created": "Sat, 30 Dec 2023 14:36:11 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jan 2024 02:22:05 GMT",
"version": "v2"
}
] | 2024-01-04 | [
[
"Zeminiani",
"G. N.",
""
],
[
"Beres",
"S. L. P. G.",
""
],
[
"Tsushima",
"K.",
""
]
] | For the first time, we estimate the in-medium mass shift of the two-flavored heavy mesons $B_c, B_c^*, B_s, B_s^*, D_s$ and $D_s^*$ in symmetric nuclear matter. The estimates are made by evaluating the lowest order one-loop self-energies. The enhanced excitations of intermediate state heavy-light mesons in symmetric nuclear matter are the origin of their negative mass shift. Our results show that the magnitude of the mass shift for the $B_c$ meson ($\bar{b} c$ or $b \bar{c}$) is larger than those of the $\eta_c (\bar{c} c)$ and $\eta_b (\bar{b} b)$, different from a naive expectation that it would be in-between of them. While, that of the $B_c^*$ shows the in-between of the $J/\psi$ and $\Upsilon$. We observe that the lighter vector meson excitation in each meson self-energy gives a dominant contribution for the corresponding meson mass shift, $B_c, B_s,$ and $D_s$. |
hep-ph/9607345 | Roland Hoepker | R. H\"opker (DESY) and W. Beenakker (Univ. Leiden) | Cross-sections for squark and gluino production at hadron colliders | 7 pages Latex, uses psfig.sty and sprocl.sty, 6 eps figures and
sprocl.sty appended as uuencoded, gzipped, tarred file. Invited talk at the
11th Topical Workshop on P-Pbar Collider Physics, Abano Terme, Italy, 26 May
- 1 June 1996 | null | null | null | hep-ph | null | We present the cross-sections for the hadroproduction of squarks and gluinos
in next-to-leading order of supersymmetric QCD. The four possible final states
squark-antisquark, squark-squark, gluino-gluino and squark-gluino are analysed
for the hadron colliders Tevatron and LHC. The dependence of the cross-sections
on the renormalization and factorization scale is reduced significantly. The
shape of the transverse-momentum and rapidity distributions remains nearly
unchanged when the next-to-leading order SUSY-QCD contributions are included.
The size of the corrections at the central scale, given by the average mass of
the produced particles, varies between $+5\%$ and $+90\%$.
| [
{
"created": "Wed, 17 Jul 1996 07:31:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Höpker",
"R.",
"",
"DESY"
],
[
"Beenakker",
"W.",
"",
"Univ. Leiden"
]
] | We present the cross-sections for the hadroproduction of squarks and gluinos in next-to-leading order of supersymmetric QCD. The four possible final states squark-antisquark, squark-squark, gluino-gluino and squark-gluino are analysed for the hadron colliders Tevatron and LHC. The dependence of the cross-sections on the renormalization and factorization scale is reduced significantly. The shape of the transverse-momentum and rapidity distributions remains nearly unchanged when the next-to-leading order SUSY-QCD contributions are included. The size of the corrections at the central scale, given by the average mass of the produced particles, varies between $+5\%$ and $+90\%$. |
2108.13020 | Shu-Sheng Xu | Shu-Sheng Xu | Phase structures of neutral dense quark matter and application to
strange stars | To be published in Chinese Physics C | null | 10.1088/1674-1137/ac2f95 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the contact interaction model, the quark propagator has only one solution,
chiral symmetry breaking solution, at vanish temperature and density. Inspire
by Y. Jiang and Z.-F. Cui, we introduce 2+1 flavors quark condensates feedback
on coupling strength, the Wigner solution appears in some region of parameters.
It enables us to tackle chiral phase transition as two-phase coexistences. At
finite chemical potential, we analyze the chiral phase transition to the
conditions of electric charge neutrality and $\beta$ equilibrium. The four
chemical potentials, $\mu_u$, $\mu_d$, $\mu_s$ and $\mu_e$, are constrained by
three conditions, there is one independent variable that remained, we choose
the average quark chemical potential as the free variable. All quark masses and
number densities suffer discontinuities at the phase transition point. The
strange quarks appear after the phase transition due to the system needs more
energy to produce a d-quark than an s-quark. Take the EOS as an input, the TOV
equations are solved numerically, we show that the mass-radius relation is
sensitive to the EOSs. The maximum mass of strange quark stars is not
susceptible to our introduced parameter $\Lambda_q$.
| [
{
"created": "Mon, 30 Aug 2021 07:02:56 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 2021 10:50:06 GMT",
"version": "v2"
}
] | 2021-10-15 | [
[
"Xu",
"Shu-Sheng",
""
]
] | In the contact interaction model, the quark propagator has only one solution, chiral symmetry breaking solution, at vanish temperature and density. Inspire by Y. Jiang and Z.-F. Cui, we introduce 2+1 flavors quark condensates feedback on coupling strength, the Wigner solution appears in some region of parameters. It enables us to tackle chiral phase transition as two-phase coexistences. At finite chemical potential, we analyze the chiral phase transition to the conditions of electric charge neutrality and $\beta$ equilibrium. The four chemical potentials, $\mu_u$, $\mu_d$, $\mu_s$ and $\mu_e$, are constrained by three conditions, there is one independent variable that remained, we choose the average quark chemical potential as the free variable. All quark masses and number densities suffer discontinuities at the phase transition point. The strange quarks appear after the phase transition due to the system needs more energy to produce a d-quark than an s-quark. Take the EOS as an input, the TOV equations are solved numerically, we show that the mass-radius relation is sensitive to the EOSs. The maximum mass of strange quark stars is not susceptible to our introduced parameter $\Lambda_q$. |
1009.3740 | Thorsten Renk | Thorsten Renk | YaJEM - a Monte Carlo code for in-medium shower evolution | Talk given at the workshop 'Jets in Proton-Proton and Heavy-Ion
Collisions', Prague, Czech Republic, 12-14 Aug 2010 | null | 10.1142/S0218301311019933 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High transverse momentum (P_T) QCD scattering processes are regarded as a
valuable tool to study the medium produced in heavy-ion collisions, as due to
uncertainty arguments their cross section should be calculable independent of
medium properties whereas the medium then modifies only the final state partons
emerging from a hard vertex. With the heavy-ion physics program at the CERN LHC
imminent, the attention of high P_T physics in heavy ion collisions is shifting
from the observation of hard single hadrons to fully reconstructed jets.
However, the presence of a background medium at low P_T complicates jet-finding
as compared to p-p collisions. Monte-Carlo (MC) codes designed to simulate the
evolution of parton showers evolving into hadron jets are valuable tools to
understand the complicated interplay between the medium modification of the jet
and the bias introduced by a specific jet-finding scheme. However, such codes
also use a set of approximations which needs to be tested against the better
understood single high P_T hadron observables. In this paper, I review the
ideas underlying the MC code YaJEM (Yet another Jet Energy-loss Model) and
present some of the results obtained with the code.
| [
{
"created": "Mon, 20 Sep 2010 09:11:18 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Renk",
"Thorsten",
""
]
] | High transverse momentum (P_T) QCD scattering processes are regarded as a valuable tool to study the medium produced in heavy-ion collisions, as due to uncertainty arguments their cross section should be calculable independent of medium properties whereas the medium then modifies only the final state partons emerging from a hard vertex. With the heavy-ion physics program at the CERN LHC imminent, the attention of high P_T physics in heavy ion collisions is shifting from the observation of hard single hadrons to fully reconstructed jets. However, the presence of a background medium at low P_T complicates jet-finding as compared to p-p collisions. Monte-Carlo (MC) codes designed to simulate the evolution of parton showers evolving into hadron jets are valuable tools to understand the complicated interplay between the medium modification of the jet and the bias introduced by a specific jet-finding scheme. However, such codes also use a set of approximations which needs to be tested against the better understood single high P_T hadron observables. In this paper, I review the ideas underlying the MC code YaJEM (Yet another Jet Energy-loss Model) and present some of the results obtained with the code. |
1102.3557 | Wang Qing | Feng-Jun Ge, Shao-Zhou Jiang, Qing Wang | Electroweak Chiral Lagrangian from TC2 Model with nontrivial TC fermion
condensation and walking | 52 pages, 27 figures | Phys.Rev.D84:015009,2011 | 10.1103/PhysRevD.84.015009 | TUHEP-TH-11175 | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The electroweak chiral Lagrangian for the topcolor assisted technicolor model
proposed by K. Lane, which uses nontrivial patterns of techniquark condensation
and walking, was investigated in this study. We found that the features of the
model are qualitatively similar to those of Lane's previous natural TC2
prototype model, but there is no limit on the upper bound of the Z' mass. We
discuss the phase structure and possible walking behavior of the model. We
obtained the values of all coefficients of the electroweak chiral Lagrangian up
to an order of p4. We show that although the walking effect reduces the S
parameter to half its original value, it maintains an order of 2. Moreover, a
special hyper-charge arrangement is needed to achieve further reductions in its
value.
| [
{
"created": "Thu, 17 Feb 2011 10:58:27 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2011 04:43:32 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Apr 2011 18:42:26 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Ge",
"Feng-Jun",
""
],
[
"Jiang",
"Shao-Zhou",
""
],
[
"Wang",
"Qing",
""
]
] | The electroweak chiral Lagrangian for the topcolor assisted technicolor model proposed by K. Lane, which uses nontrivial patterns of techniquark condensation and walking, was investigated in this study. We found that the features of the model are qualitatively similar to those of Lane's previous natural TC2 prototype model, but there is no limit on the upper bound of the Z' mass. We discuss the phase structure and possible walking behavior of the model. We obtained the values of all coefficients of the electroweak chiral Lagrangian up to an order of p4. We show that although the walking effect reduces the S parameter to half its original value, it maintains an order of 2. Moreover, a special hyper-charge arrangement is needed to achieve further reductions in its value. |
1507.06224 | Jessica Turner | Jessica Turner | Predictions for Leptonic Mixing Angle Correlations and Non-trivial Dirac
CP Violation from $A_5$ with Generalised CP Symmetry | null | Phys. Rev. D 92, 116007 (2015) | 10.1103/PhysRevD.92.116007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using discrete flavour group, $A_5$, combined with generalised CP, we study
the mixing parameter correlations which arise from breaking to residual
symmetries in the neutrino, $G_{\nu}=\mathbb{Z}_2\times \text{CP}$, and charged
lepton sectors, $G_{e}=\mathbb{Z}_2$. By focusing on patterns that agree with
current experimental data we demonstrate that non-trivial leptonic phases are
predicted and discuss a number of distinctive correlations between mixing
parameters.
| [
{
"created": "Wed, 22 Jul 2015 15:15:29 GMT",
"version": "v1"
}
] | 2015-12-23 | [
[
"Turner",
"Jessica",
""
]
] | Using discrete flavour group, $A_5$, combined with generalised CP, we study the mixing parameter correlations which arise from breaking to residual symmetries in the neutrino, $G_{\nu}=\mathbb{Z}_2\times \text{CP}$, and charged lepton sectors, $G_{e}=\mathbb{Z}_2$. By focusing on patterns that agree with current experimental data we demonstrate that non-trivial leptonic phases are predicted and discuss a number of distinctive correlations between mixing parameters. |
hep-ph/9906529 | Yue-Liang Wu | W.Y. Wang, Y.L. Wu and Y.A. Yan | Weak Matrix Elements and |V_cb| in New Formulation of Heavy Quark
Effective Field Theory | 28 pages, Revtex, 5 figures, 3 tables, minor changes with "dressed
heavy quark" being addressed, to be published in Int. J. Mod. Phys. A | Int.J.Mod.Phys. A15 (2000) 1817-1857 | 10.1142/S0217751X00000793 | AS-ITP 99-06 | hep-ph | null | The heavy quark effective field theory (HQEFT) containing both effective
`quark fields' and `antiquark fields' is investigated in detail. By integrating
out (but not neglecting) the effective antiquark fields, we present a new
formulation of effective theory which differs from the usual heavy quark
effective theory (HQET) and exhibits valuable features because of the inclusion
of the contributions from the antiquark fields. Matrix elements of vector and
axial vector heavy quark currents between pseudoscalar and vector mesons
containing a heavy quark (b or c) are then evaluated systematically up to the
order of $1/m^2_Q$ and parameterized by a set of universal form factors. With a
consistent normalization condition between the effective heavy hadron states,
the form factors at zero recoil are related to the ground state meson masses,
which enables us to estimate the values of form factors at zero recoil. In
particular, the Luke's theorem comes out automatically in the new formulation
of HQEFT without the need of imposing the equation of motion $iv\cdot D
Q^{+}_{v} =0$. Consequently, the differential decay rates of both $B\to
D^{\ast}l\nu$ and $B\to D l\nu$ do not receive $1/m_{Q}$ order corrections at
zero recoil, which is not the case in the usual HQET. Thus we quote that the
Cabibbo-Kobayashi-Maskawa matrix element $| V_{cb}|$ can nicely be extracted
from either of these two exclusive semileptonic decays at the order of
$1/m^2_Q$. Our estimates for $|V_{cb}|$ are presented.
| [
{
"created": "Tue, 29 Jun 1999 06:33:04 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jul 1999 04:06:38 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Feb 2000 08:54:38 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Wang",
"W. Y.",
""
],
[
"Wu",
"Y. L.",
""
],
[
"Yan",
"Y. A.",
""
]
] | The heavy quark effective field theory (HQEFT) containing both effective `quark fields' and `antiquark fields' is investigated in detail. By integrating out (but not neglecting) the effective antiquark fields, we present a new formulation of effective theory which differs from the usual heavy quark effective theory (HQET) and exhibits valuable features because of the inclusion of the contributions from the antiquark fields. Matrix elements of vector and axial vector heavy quark currents between pseudoscalar and vector mesons containing a heavy quark (b or c) are then evaluated systematically up to the order of $1/m^2_Q$ and parameterized by a set of universal form factors. With a consistent normalization condition between the effective heavy hadron states, the form factors at zero recoil are related to the ground state meson masses, which enables us to estimate the values of form factors at zero recoil. In particular, the Luke's theorem comes out automatically in the new formulation of HQEFT without the need of imposing the equation of motion $iv\cdot D Q^{+}_{v} =0$. Consequently, the differential decay rates of both $B\to D^{\ast}l\nu$ and $B\to D l\nu$ do not receive $1/m_{Q}$ order corrections at zero recoil, which is not the case in the usual HQET. Thus we quote that the Cabibbo-Kobayashi-Maskawa matrix element $| V_{cb}|$ can nicely be extracted from either of these two exclusive semileptonic decays at the order of $1/m^2_Q$. Our estimates for $|V_{cb}|$ are presented. |
hep-ph/9810273 | Nguyen Anh Ky | Nguyen Tuan Anh, Nguyen Anh Ky and Hoang Ngoc Long | The Higgs Sector of the Minimal 3 3 1 Model Revisited | 20 pages, latex, two figures. One note and one reference are added | Int.J.Mod.PHys.A15:283-305,2000 | 10.1142/S0217751X00000136 | LAPTH-701/98 | hep-ph astro-ph | null | The mass spectrum and the eigenstates of the Higgs sector of the minimal 3 3
1 model are revisited in detail. There are discrepancies between our results
and previous results by another author.
| [
{
"created": "Wed, 7 Oct 1998 15:28:20 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 1998 12:42:59 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Anh",
"Nguyen Tuan",
""
],
[
"Ky",
"Nguyen Anh",
""
],
[
"Long",
"Hoang Ngoc",
""
]
] | The mass spectrum and the eigenstates of the Higgs sector of the minimal 3 3 1 model are revisited in detail. There are discrepancies between our results and previous results by another author. |
0710.3818 | Marina-Aura Dariescu | Marina--Aura Dariescu and Ciprian Dariescu | Improved Factorization Method in Studying B-meson Decays | 8 pgs, International Conference on Hadron Physics TROIA'07,
Canakkale, Turkey, 30 August - 03 September 2007 | null | null | null | hep-ph | null | B decays are a subject of active research since they provide useful
information on the dynamics of strong and electroweak interactions for testing
the Standard Model (SM) and models beyond and are ideally suited for a critical
analysis of CP violation phenomena. Within the standard model, there exist
certain relations between CP violating rate differences in B decays in the
SU(3) limit, as for example $\Delta (\bar{B}^0 \to \pi^+ \pi^-) = - \Delta
(\bar{B}^0 \to \pi^+ K^-)$. The goal of this letter is to study the direct CP
violation asymmetry in a class of processes where there has been recent
theoretical progress, as for example the B decays into two light pseudoscalars
mesons and into a light pseudoscalar and a light vector meson. We identify
relations between rate asymmetries which are valid in the SU(3) limit in the
standard model and we compute SU(3) breaking corrections to them, going beyond
the naive factorization by using the QCD improved factorization model of Beneke
{\it et al.}. Finally, in some processes as for example $BR(B^- \to
\eta^{\prime} K^-)$, we claim that one has to add SUSY contributions to the
Wilson coefficients. In these cases, we end with a $BR$ depending on three
parameters, whose values are constrained by the experimental data.
| [
{
"created": "Sat, 20 Oct 2007 05:34:59 GMT",
"version": "v1"
}
] | 2007-10-23 | [
[
"Dariescu",
"Marina--Aura",
""
],
[
"Dariescu",
"Ciprian",
""
]
] | B decays are a subject of active research since they provide useful information on the dynamics of strong and electroweak interactions for testing the Standard Model (SM) and models beyond and are ideally suited for a critical analysis of CP violation phenomena. Within the standard model, there exist certain relations between CP violating rate differences in B decays in the SU(3) limit, as for example $\Delta (\bar{B}^0 \to \pi^+ \pi^-) = - \Delta (\bar{B}^0 \to \pi^+ K^-)$. The goal of this letter is to study the direct CP violation asymmetry in a class of processes where there has been recent theoretical progress, as for example the B decays into two light pseudoscalars mesons and into a light pseudoscalar and a light vector meson. We identify relations between rate asymmetries which are valid in the SU(3) limit in the standard model and we compute SU(3) breaking corrections to them, going beyond the naive factorization by using the QCD improved factorization model of Beneke {\it et al.}. Finally, in some processes as for example $BR(B^- \to \eta^{\prime} K^-)$, we claim that one has to add SUSY contributions to the Wilson coefficients. In these cases, we end with a $BR$ depending on three parameters, whose values are constrained by the experimental data. |
1612.07248 | Antonio Vairo | Nora Brambilla, Miguel A. Escobedo, Joan Soto, Antonio Vairo | Quarkonium suppression in heavy-ion collisions: an open quantum system
approach | 6 pages, 3 figures | Phys. Rev. D 96, 034021 (2017) | 10.1103/PhysRevD.96.034021 | ICCUB-16-044, TUM-EFT 55/14 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the evolution of heavy-quarkonium states in an expanding
quark-gluon plasma by implementing effective field theory techniques in the
framework of open quantum systems. In this setting we compute the nuclear
modification factors for quarkonia that are $S$-wave Coulombic bound states in
a strongly-coupled quark-gluon plasma. The calculation is performed at an
accuracy that is leading-order in the heavy-quark density expansion and
next-to-leading order in the multipole expansion. The quarkonium density-matrix
evolution equations can be written in the Lindblad form, and, hence, they
account for both dissociation and recombination. Thermal mass shifts, thermal
widths and the Lindblad equation itself depend on only two non-perturbative
parameters: the heavy-quark momentum diffusion coefficient and its dispersive
counterpart. Finally, by numerically solving the Lindblad equation, we provide
results for the $\Upsilon(1S)$ and $\Upsilon(2S)$ suppression.
| [
{
"created": "Wed, 21 Dec 2016 17:37:17 GMT",
"version": "v1"
}
] | 2017-08-30 | [
[
"Brambilla",
"Nora",
""
],
[
"Escobedo",
"Miguel A.",
""
],
[
"Soto",
"Joan",
""
],
[
"Vairo",
"Antonio",
""
]
] | We address the evolution of heavy-quarkonium states in an expanding quark-gluon plasma by implementing effective field theory techniques in the framework of open quantum systems. In this setting we compute the nuclear modification factors for quarkonia that are $S$-wave Coulombic bound states in a strongly-coupled quark-gluon plasma. The calculation is performed at an accuracy that is leading-order in the heavy-quark density expansion and next-to-leading order in the multipole expansion. The quarkonium density-matrix evolution equations can be written in the Lindblad form, and, hence, they account for both dissociation and recombination. Thermal mass shifts, thermal widths and the Lindblad equation itself depend on only two non-perturbative parameters: the heavy-quark momentum diffusion coefficient and its dispersive counterpart. Finally, by numerically solving the Lindblad equation, we provide results for the $\Upsilon(1S)$ and $\Upsilon(2S)$ suppression. |
hep-ph/0610420 | Mohammad Hussein Yousif | M Y Hussein | Electromagetic proton form factors | 7 pages, 1 figurs | null | null | null | hep-ph | null | The electromagnetic form factors are crucial to our understanding of the
proton internal structure, and thus provide a strong constraint of the
distributions of the charge and magnetization current within the proton. We
adopted the quark-parton model for calculating and understanding the charge
structure of the proton interms of the electromagnetic form factors. A
remarkable agreement with the available experimental evidence is found.
| [
{
"created": "Tue, 31 Oct 2006 05:20:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hussein",
"M Y",
""
]
] | The electromagnetic form factors are crucial to our understanding of the proton internal structure, and thus provide a strong constraint of the distributions of the charge and magnetization current within the proton. We adopted the quark-parton model for calculating and understanding the charge structure of the proton interms of the electromagnetic form factors. A remarkable agreement with the available experimental evidence is found. |
2109.05682 | Prasenjit Sanyal | Tanmoy Mondal and Prasenjit Sanyal | Same sign trilepton as signature of charged Higgs in two Higgs doublet
model | 19 pages, 6 figures, 3 tables | JHEP05(2022)040 | 10.1007/JHEP05(2022)040 | KIAS-P21032, APCTP Pre2021-021 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We explored the prospect of looking for a fermiophobic charged Higgs ($\hpm$)
via the same sign trilepton signal at the LHC. A fermiophobic scenario appears
in the type-I two Higgs doublet model where the coupling of the $\hpm$ with the
Standard Model fermions is inversely proportional to $\tb$. Almost all the
experimental searches rely on the fermionic production and decay of the charged
Higgs. Consequently, the limit on $\hpm$ for fermiophobic scenarios is
non-existent unless $\tb$ is small. We show that for a fermiophobic case, the
electroweak production of $\hpm$ is dominant for most of the parameter space.
Subsequent bosonic decay of the charged and neutral Higgses give rise to the
same sign trilepton signal. With a thorough phenomenological analysis, we
demonstrate that the same sign trilepton signal can be an excellent
complementary search to explore the high $\tb$ regions.
| [
{
"created": "Mon, 13 Sep 2021 03:21:07 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Sep 2021 06:39:42 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Mar 2022 13:00:55 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Apr 2022 06:06:04 GMT",
"version": "v4"
}
] | 2022-05-11 | [
[
"Mondal",
"Tanmoy",
""
],
[
"Sanyal",
"Prasenjit",
""
]
] | We explored the prospect of looking for a fermiophobic charged Higgs ($\hpm$) via the same sign trilepton signal at the LHC. A fermiophobic scenario appears in the type-I two Higgs doublet model where the coupling of the $\hpm$ with the Standard Model fermions is inversely proportional to $\tb$. Almost all the experimental searches rely on the fermionic production and decay of the charged Higgs. Consequently, the limit on $\hpm$ for fermiophobic scenarios is non-existent unless $\tb$ is small. We show that for a fermiophobic case, the electroweak production of $\hpm$ is dominant for most of the parameter space. Subsequent bosonic decay of the charged and neutral Higgses give rise to the same sign trilepton signal. With a thorough phenomenological analysis, we demonstrate that the same sign trilepton signal can be an excellent complementary search to explore the high $\tb$ regions. |
0710.5027 | Thomas Schwetz | Thomas Schwetz | Neutrino oscillations: present status and outlook | 6 pages, 5 figures, plenary talk at NuFact07, Okayama, Japan | AIPConf.Proc.981:8-12,2008 | 10.1063/1.2899010 | CERN-PH-TH-207 | hep-ph | null | I summarize the status of three-flavour neutrino oscillations with date of
Oct. 2007, and provide an outlook for the developments to be expected in the
near future. Furthermore, I discuss the status of sterile neutrino oscillation
interpretations of the LSND anomaly in the light of recent MiniBooNE results,
and comment on implications for the future neutrino oscillation program.
| [
{
"created": "Fri, 26 Oct 2007 08:52:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Schwetz",
"Thomas",
""
]
] | I summarize the status of three-flavour neutrino oscillations with date of Oct. 2007, and provide an outlook for the developments to be expected in the near future. Furthermore, I discuss the status of sterile neutrino oscillation interpretations of the LSND anomaly in the light of recent MiniBooNE results, and comment on implications for the future neutrino oscillation program. |
1910.11746 | Felix Ringer | Tom Kaufmann, Xiaohui Liu, Asmita Mukherjee, Felix Ringer, Werner
Vogelsang | Hadron-in-jet production at partonic threshold | 22 pages, 4 figures | null | 10.1007/JHEP02(2020)040 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the longitudinal momentum distribution of hadrons inside jets in
proton-proton collisions. At partonic threshold large double logarithmic
corrections arise which need to be resummed to all orders. We develop a
factorization formalism within SCET that allows for the joint resummation of
threshold and jet radius logarithms. We achieve next-to-leading logarithmic
NLL$'$ accuracy by including non-global logarithms in the leading-color
approximation. Overall, we find that the threshold resummation leads to a
sizable enhancement of the cross section and a reduced QCD scale dependence,
suggesting that the all-order resummation can be important for the reliable
extraction of fragmentation functions in global analyses when jet substructure
data is included.
| [
{
"created": "Fri, 25 Oct 2019 14:15:14 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Kaufmann",
"Tom",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Ringer",
"Felix",
""
],
[
"Vogelsang",
"Werner",
""
]
] | We consider the longitudinal momentum distribution of hadrons inside jets in proton-proton collisions. At partonic threshold large double logarithmic corrections arise which need to be resummed to all orders. We develop a factorization formalism within SCET that allows for the joint resummation of threshold and jet radius logarithms. We achieve next-to-leading logarithmic NLL$'$ accuracy by including non-global logarithms in the leading-color approximation. Overall, we find that the threshold resummation leads to a sizable enhancement of the cross section and a reduced QCD scale dependence, suggesting that the all-order resummation can be important for the reliable extraction of fragmentation functions in global analyses when jet substructure data is included. |
hep-ph/0507307 | Jogesh C. Pati | Jogesh C. Pati | A Unified Picture with Neutrino As a Central Feature | 46 pages | Proceedings of the XI International Workshop on `` Neutrino
Telescopes'', Venice, February 21-25, 2005 | null | null | hep-ph | null | In the first part of this talk it is discussed why observed neutrino
oscillations (which suggest the existence of right-handed neutrinos with
certain Dirac and Majorana masses) seem to select out the route to higher
unification based on the symmetry SU(4)-color. This in turn selects out the
effective symmetry in 4D near the GUT/string scale to be either SO(10) or
minimally G(224)= SU(2)_L\times SU(2)_R \times SU(4)^c. The same conclusion is
reached by the likely need for leptogenesis as the means for baryogenesis and
also by the success of certain fermion mass-relations including
m_b(M_{GUT})\approx m_\tau, together with m(\nu^\tau)_{Dirac}\approx
m_{top}(M_{GUT}). In the second part, an attempt is made to provide a unified
picture of a set of diverse phenomena based on an effective G(224) symmetry or
SO(10), possessing supersymmetry. The phenomena in question include: (a)
fermion masses and mixings, (b) neutrino oscillations, (c) CP non-conservation,
(d) flavor violations in quark and lepton sectors, as well as (e) baryogenesis
via leptogenesis. Including SM and SUSY contributions, the latter being
sub-dominant, the framework correctly accounts for \Delta m_K, \Delta m_{B_d},
S(B_d -> J/\psi K_s) and \epsilon_K, and predicts S(B_d-> \phi K_s) to be in
the range +(0.65-0.73), close to the SM-prediction. It also quite plausibly
accounts for the observed baryon excess Y_B\approx 10^{-10}. Furthermore the
model predicts enhanced rates for mu -> e gamma, tau-> mu gamma and mu N-> e N
and also measurable electric dipole moment for the neutron. Expectations
arising within the same framework for proton decay are summarized at the end.
It is stressed that the potential for discovering proton decay in a
megaton-size detector would be high.
| [
{
"created": "Tue, 26 Jul 2005 22:18:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pati",
"Jogesh C.",
""
]
] | In the first part of this talk it is discussed why observed neutrino oscillations (which suggest the existence of right-handed neutrinos with certain Dirac and Majorana masses) seem to select out the route to higher unification based on the symmetry SU(4)-color. This in turn selects out the effective symmetry in 4D near the GUT/string scale to be either SO(10) or minimally G(224)= SU(2)_L\times SU(2)_R \times SU(4)^c. The same conclusion is reached by the likely need for leptogenesis as the means for baryogenesis and also by the success of certain fermion mass-relations including m_b(M_{GUT})\approx m_\tau, together with m(\nu^\tau)_{Dirac}\approx m_{top}(M_{GUT}). In the second part, an attempt is made to provide a unified picture of a set of diverse phenomena based on an effective G(224) symmetry or SO(10), possessing supersymmetry. The phenomena in question include: (a) fermion masses and mixings, (b) neutrino oscillations, (c) CP non-conservation, (d) flavor violations in quark and lepton sectors, as well as (e) baryogenesis via leptogenesis. Including SM and SUSY contributions, the latter being sub-dominant, the framework correctly accounts for \Delta m_K, \Delta m_{B_d}, S(B_d -> J/\psi K_s) and \epsilon_K, and predicts S(B_d-> \phi K_s) to be in the range +(0.65-0.73), close to the SM-prediction. It also quite plausibly accounts for the observed baryon excess Y_B\approx 10^{-10}. Furthermore the model predicts enhanced rates for mu -> e gamma, tau-> mu gamma and mu N-> e N and also measurable electric dipole moment for the neutron. Expectations arising within the same framework for proton decay are summarized at the end. It is stressed that the potential for discovering proton decay in a megaton-size detector would be high. |
0904.3773 | Bhaskar Dutta | Bhaskar Dutta, Louis Leblond and Kuver Sinha | Mirage in the Sky: Non-thermal Dark Matter, Gravitino Problem, and
Cosmic Ray Anomalies | 11 pages, 4 figures | Phys.Rev.D80:035014,2009 | 10.1103/PhysRevD.80.035014 | MIFP-09-19, NSF-KITP-09-52 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent anomalies in cosmic rays could be due to dark matter annihilation in
our galaxy. In order to get the required large cross-section to explain the
data while still obtaining the right relic density, we rely on a non standard
thermal history between dark matter freeze-out and Big-Bang Nucleosynthesis
(BBN). We show that through a reheating phase from the decay of a heavy moduli
or even the gravitino, we can produce the right relic density of dark matter if
its self-annihilation cross-section is large enough. In addition to fitting the
recent data, this scenario solves the cosmological moduli and gravitino
problems. We illustrate this mechanism with a specific example in the context
of U(1)_{B-L} extended MSSM where supersymmetry is broken via mirage mediation.
These string motivated models naturally contain heavy moduli decaying to the
gravitino, whose subsequent decay to the LSP can reheat the universe at a low
temperature. The right-handed sneutrino and the B-L gaugino can both be viable
dark matter candidates with large cross-section. They are leptophilic because
of B-L charges. We also show that it is possible to distinguish the non-thermal
from the thermal scenario (using Sommerfeld enhancement) in direct detection
experiments for certain regions of parameter space.
| [
{
"created": "Fri, 24 Apr 2009 01:23:44 GMT",
"version": "v1"
}
] | 2009-09-02 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Leblond",
"Louis",
""
],
[
"Sinha",
"Kuver",
""
]
] | Recent anomalies in cosmic rays could be due to dark matter annihilation in our galaxy. In order to get the required large cross-section to explain the data while still obtaining the right relic density, we rely on a non standard thermal history between dark matter freeze-out and Big-Bang Nucleosynthesis (BBN). We show that through a reheating phase from the decay of a heavy moduli or even the gravitino, we can produce the right relic density of dark matter if its self-annihilation cross-section is large enough. In addition to fitting the recent data, this scenario solves the cosmological moduli and gravitino problems. We illustrate this mechanism with a specific example in the context of U(1)_{B-L} extended MSSM where supersymmetry is broken via mirage mediation. These string motivated models naturally contain heavy moduli decaying to the gravitino, whose subsequent decay to the LSP can reheat the universe at a low temperature. The right-handed sneutrino and the B-L gaugino can both be viable dark matter candidates with large cross-section. They are leptophilic because of B-L charges. We also show that it is possible to distinguish the non-thermal from the thermal scenario (using Sommerfeld enhancement) in direct detection experiments for certain regions of parameter space. |
hep-ph/9704394 | Igor Shovkovy | V.P. Gusynin and I.A. Shovkovy | Chiral Symmetry Breaking in QED in a Magnetic Field at Finite
Temperature | 9 pages. REVTeX | Phys.Rev. D56 (1997) 5251-5253 | 10.1103/PhysRevD.56.5251 | Kiev preprint ITP-97-23E | hep-ph hep-th | null | The catalysis of chiral symmetry breaking in the massless weakly coupled QED
in a magnetic field at finite temperature is studied. The temperature of the
symmetry restoration is estimated analytically as $T_c\simeq m_{dyn}$, where
$m_{dyn}$ is the dynamical mass of a fermion at zero temperature.
| [
{
"created": "Thu, 24 Apr 1997 13:58:12 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Gusynin",
"V. P.",
""
],
[
"Shovkovy",
"I. A.",
""
]
] | The catalysis of chiral symmetry breaking in the massless weakly coupled QED in a magnetic field at finite temperature is studied. The temperature of the symmetry restoration is estimated analytically as $T_c\simeq m_{dyn}$, where $m_{dyn}$ is the dynamical mass of a fermion at zero temperature. |
hep-ph/0112011 | Ladisa Massimo | G. Eilam, M. Ladisa, Y.D. Yang (Technion) | Semileptonic and nonleptonic B decays to three charm quarks: B->J/psi
(eta_c) D l nu and J/psi (eta_c) D pi | 14 pages, 4 figures | Phys.Rev. D67 (2003) 054022 | 10.1103/PhysRevD.67.054022 | null | hep-ph | null | We evaluate the form factors describing the semileptonic decays $\bar{B^0}\to
J/\psi (\eta_c) D^+ \ell^- \bar \nu_\ell$, within the framework of a QCD
relativistic potential model. This decay is complementary to $\bar{B^0}\to
J/\psi (\eta_c) D^+ \pi^-$ in a phase space region where a pion factors out.We
estimate the branching ratio for these semileptonic and nonleptonic channels,
finding $\mathcal{BR}(\bar{B^0} \to J/\psi (\eta_c) D^+ \ell \nu_\ell) \simeq
10^{-13}$, $\mathcal{BR}(\bar{B^0} \to J/\psi D^+ \pi^-) = 3.1 \times 10^{-8}$
and $\mathcal{BR}(\bar{B^0} \to \eta_c D^+ \pi^-) = 3.5 \times 10^{-8}$.
| [
{
"created": "Sun, 2 Dec 2001 13:49:18 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Eilam",
"G.",
"",
"Technion"
],
[
"Ladisa",
"M.",
"",
"Technion"
],
[
"Yang",
"Y. D.",
"",
"Technion"
]
] | We evaluate the form factors describing the semileptonic decays $\bar{B^0}\to J/\psi (\eta_c) D^+ \ell^- \bar \nu_\ell$, within the framework of a QCD relativistic potential model. This decay is complementary to $\bar{B^0}\to J/\psi (\eta_c) D^+ \pi^-$ in a phase space region where a pion factors out.We estimate the branching ratio for these semileptonic and nonleptonic channels, finding $\mathcal{BR}(\bar{B^0} \to J/\psi (\eta_c) D^+ \ell \nu_\ell) \simeq 10^{-13}$, $\mathcal{BR}(\bar{B^0} \to J/\psi D^+ \pi^-) = 3.1 \times 10^{-8}$ and $\mathcal{BR}(\bar{B^0} \to \eta_c D^+ \pi^-) = 3.5 \times 10^{-8}$. |
hep-ph/0210401 | Margarete Muhlleitner | Margarete Muhlleitner | MSSM Higgs particles in the intense--coupling regime | Talk given at the 10th International Conference on Supersymmetry and
Unfication of Fundamental Interactions (SUSY02), Hamburg, Germany, 17-23 Jun
2002; 7 pp | null | null | PM/02-40, PSI-PR-02-16 | hep-ph | null | In the "intense--coupling" regime all Higgs bosons of the Minimal
Supersymmetric extension of the Standard Model (MSSM) are rather light and have
comparable masses of O(100 GeV). They couple maximally to electroweak gauge
bosons, and for large ratios of the vacuum expectation values of the two Higgs
doublet fields, tan\beta, they interact strongly with the standard third
generation fermions. We present in this note a comprehensive study of this
scenario. We summarize the main phenomenological features, and the accordance
with the direct constraints from Higgs boson searches at LEP2 and the Tevatron
as well as the indirect constraints from precision measurements will be
checked. After the presentation of the decay branching ratios, we discuss the
production cross sections of the neutral Higgs particles in this regime at
future colliders, the Tevatron Run II, the LHC and a 500 GeV e+e- linear
collider.
| [
{
"created": "Tue, 29 Oct 2002 11:51:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Muhlleitner",
"Margarete",
""
]
] | In the "intense--coupling" regime all Higgs bosons of the Minimal Supersymmetric extension of the Standard Model (MSSM) are rather light and have comparable masses of O(100 GeV). They couple maximally to electroweak gauge bosons, and for large ratios of the vacuum expectation values of the two Higgs doublet fields, tan\beta, they interact strongly with the standard third generation fermions. We present in this note a comprehensive study of this scenario. We summarize the main phenomenological features, and the accordance with the direct constraints from Higgs boson searches at LEP2 and the Tevatron as well as the indirect constraints from precision measurements will be checked. After the presentation of the decay branching ratios, we discuss the production cross sections of the neutral Higgs particles in this regime at future colliders, the Tevatron Run II, the LHC and a 500 GeV e+e- linear collider. |
hep-ph/0206033 | Todd Fugleberg | Todd. D. Fugleberg (BNL) | General Quasiparticle Propagator and Mass Dependence in Degenerate Color
Superconductivity | 35 pages, 10 figures, LaTeX; Reference and related comments added | Phys.Rev. D67 (2003) 034013 | 10.1103/PhysRevD.67.034013 | null | hep-ph | null | The general quasiparticle propagator in dense quark matter is derived for
equal mass quarks. Specialized to an NJL model, this propagator includes one
new condensate, $\Delta_3$, in addition to the usual CFL condensate,
$\Delta_1$. The gap equation is solved in two NJL models and the dependence on
the quark mass of the condensates and the gap is presented. Analytic
approximations for the condensates are obtained and compared to exact numerical
solutions. The results are shown to differ from those obtained by neglecting
$\Delta_3$, especially for smaller values of $\Delta_1$. The two different NJL
models presented are also shown to give different results when $\Delta_3$ is
not neglected. The methods used in this paper can be generalized to the
physical case where only the strange quark is significantly massive.
| [
{
"created": "Tue, 4 Jun 2002 16:10:37 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Aug 2002 18:43:23 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Fugleberg",
"Todd. D.",
"",
"BNL"
]
] | The general quasiparticle propagator in dense quark matter is derived for equal mass quarks. Specialized to an NJL model, this propagator includes one new condensate, $\Delta_3$, in addition to the usual CFL condensate, $\Delta_1$. The gap equation is solved in two NJL models and the dependence on the quark mass of the condensates and the gap is presented. Analytic approximations for the condensates are obtained and compared to exact numerical solutions. The results are shown to differ from those obtained by neglecting $\Delta_3$, especially for smaller values of $\Delta_1$. The two different NJL models presented are also shown to give different results when $\Delta_3$ is not neglected. The methods used in this paper can be generalized to the physical case where only the strange quark is significantly massive. |
hep-ph/0701216 | Robert Fleischer | Robert Fleischer (CERN) | Theoretical Review of $\gamma/\phi_3$ Measurements with $B_s$ Decays to
Charm | 4 pages, 2 figures, talk given at the 4th International Workshop on
the CKM Unitarity Triangle (CKM2006), 12-16 December 2006, Nagoya, Japan, to
appear in the proceedings (KEK Report) | null | null | CERN-PH-TH/2007-016 | hep-ph | null | We give an overview of various determinations of $\gamma/\phi_3$ with the
help of $B_s$ decays into charmed final states, distinguishing between
transitions with tree and penguin contributions and pure tree decays. In the
corresponding strategies, the $U$-spin flavour symmetry of strong interactions
provides a very useful tool, and offers interesting "by-producs" for the
$B$-physics programme at the LHC, including the control of the penguin
uncertainties in the determinations of the $B^0_d$-$\bar B^0_d$ and
$B^0_s$--$\bar B^0_s$ mixing phases $\phi_d$ and $\phi_s$ from $B_d\to J/\psi
K_S$ and $B_s\to J/\psi\phi$, respectively, and an alternative extraction of
the latter phase through $B_s\to D_s^+D_s^-$. Finally, we point out that the
cleanest determinations of the mixing phases $\phi_s$ and $\phi_d$ are offered
by the pure tree decays $B_s\to D_\pm K_{S(L)}$ and $B_d\to D_\pm\pi^0,
D_\pm\rho^0, ...$, respectively, which are very interesting for the searches of
new physics.
| [
{
"created": "Thu, 25 Jan 2007 15:33:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] | We give an overview of various determinations of $\gamma/\phi_3$ with the help of $B_s$ decays into charmed final states, distinguishing between transitions with tree and penguin contributions and pure tree decays. In the corresponding strategies, the $U$-spin flavour symmetry of strong interactions provides a very useful tool, and offers interesting "by-producs" for the $B$-physics programme at the LHC, including the control of the penguin uncertainties in the determinations of the $B^0_d$-$\bar B^0_d$ and $B^0_s$--$\bar B^0_s$ mixing phases $\phi_d$ and $\phi_s$ from $B_d\to J/\psi K_S$ and $B_s\to J/\psi\phi$, respectively, and an alternative extraction of the latter phase through $B_s\to D_s^+D_s^-$. Finally, we point out that the cleanest determinations of the mixing phases $\phi_s$ and $\phi_d$ are offered by the pure tree decays $B_s\to D_\pm K_{S(L)}$ and $B_d\to D_\pm\pi^0, D_\pm\rho^0, ...$, respectively, which are very interesting for the searches of new physics. |
hep-ph/0412333 | Colin David Froggatt | C.D. Froggatt, L.V. Laperashvili, R.B. Nevzorov, H.B. Nielsen, M. Sher | The Two Higgs Doublet Model and the Multiple Point Principle | 14 pages, 2 figures, to be published in the Proceedings of the Bled
workshop on What comes beyond the Standard Model?, 19-30 July 2004 | null | null | GUTPA/04/12/01 | hep-ph | null | According to the multiple point principle, Nature adjusts coupling parameters
so that many vacuum states exist and each has approximately zero vacuum energy
density. We apply this principle to the general two-Higgs doublet extension of
the Standard Model, by requiring the existence of a large set of degenerate
vacua at an energy scale much higher than the presently realized electroweak
scale vacuum. It turns out that two scenarios are allowed. In the first
scenario, a CP conserving Higgs potential and the absence of flavour changing
neutral currents are obtained without fine-tuning. In the second scenario, the
photon becomes massive in the high scale vacua. We briefly discuss the
resulting phenomenology.
| [
{
"created": "Wed, 22 Dec 2004 13:00:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Froggatt",
"C. D.",
""
],
[
"Laperashvili",
"L. V.",
""
],
[
"Nevzorov",
"R. B.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Sher",
"M.",
""
]
] | According to the multiple point principle, Nature adjusts coupling parameters so that many vacuum states exist and each has approximately zero vacuum energy density. We apply this principle to the general two-Higgs doublet extension of the Standard Model, by requiring the existence of a large set of degenerate vacua at an energy scale much higher than the presently realized electroweak scale vacuum. It turns out that two scenarios are allowed. In the first scenario, a CP conserving Higgs potential and the absence of flavour changing neutral currents are obtained without fine-tuning. In the second scenario, the photon becomes massive in the high scale vacua. We briefly discuss the resulting phenomenology. |
0908.2003 | Zhi-Gang Wang | Zhi-Gang Wang, Xiao-Hong Zhang | Analysis of the pseudoscalar partner of the Y(4660) and related bound
states | 16 pages, 28 figures, revised version | Eur.Phys.J.C66:419-428,2010 | 10.1140/epjc/s10052-010-1253-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the pseudoscalar bound state $\eta_c'f_0(980)$
(irrespective of the hadro-charmonium and the molecular state) with the QCD sum
rules. Considering the SU(3) symmetry of the light flavor quarks and the heavy
quark symmetry, we also study the bound states $\eta_c'\sigma(400-1200)$,
$\eta_b'''f_0(980)$ and $\eta_b'''\sigma(400-1200)$, and make reasonable
predictions for their masses.
| [
{
"created": "Fri, 14 Aug 2009 01:18:11 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2009 02:30:18 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jan 2010 07:25:37 GMT",
"version": "v3"
}
] | 2010-04-26 | [
[
"Wang",
"Zhi-Gang",
""
],
[
"Zhang",
"Xiao-Hong",
""
]
] | In this article, we study the pseudoscalar bound state $\eta_c'f_0(980)$ (irrespective of the hadro-charmonium and the molecular state) with the QCD sum rules. Considering the SU(3) symmetry of the light flavor quarks and the heavy quark symmetry, we also study the bound states $\eta_c'\sigma(400-1200)$, $\eta_b'''f_0(980)$ and $\eta_b'''\sigma(400-1200)$, and make reasonable predictions for their masses. |
hep-ph/0504202 | Javier Redondo | Eduard Masso and Javier Redondo | Evading Astrophysical Constraints on Axion-Like Particles | Final Version Accepted in JCAP | JCAP0509:015,2005 | 10.1088/1475-7516/2005/09/015 | UAB-FT-579 | hep-ph astro-ph | null | Stellar energy loss arguments lead to strong constraints on the coupling
$\phi \gamma \gamma$ of a light axion-like particle to two photons.
Helioscopes, like CAST, are able to put competitive bounds. The PVLAS
experiment has recently observed a rotation of the polarization of a laser
propagating in a magnetic field that can be interpreted as the effect of a
quite strong $\phi \gamma \gamma$ coupling. We present scenarios where the
astrophysical and CAST bounds can be evaded, and we show that the PVLAS result
can be accomodated in one of the models, provided the new physics scale is at
very low energies.
| [
{
"created": "Fri, 22 Apr 2005 09:06:46 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2005 15:42:35 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Sep 2005 14:44:41 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Masso",
"Eduard",
""
],
[
"Redondo",
"Javier",
""
]
] | Stellar energy loss arguments lead to strong constraints on the coupling $\phi \gamma \gamma$ of a light axion-like particle to two photons. Helioscopes, like CAST, are able to put competitive bounds. The PVLAS experiment has recently observed a rotation of the polarization of a laser propagating in a magnetic field that can be interpreted as the effect of a quite strong $\phi \gamma \gamma$ coupling. We present scenarios where the astrophysical and CAST bounds can be evaded, and we show that the PVLAS result can be accomodated in one of the models, provided the new physics scale is at very low energies. |
hep-ph/0307354 | Shouhua Zhu | Chao-Shang Huang (ITP, CAS) and Shou-hua Zhu (Carleton Uni) | CP violation in $B \to \Phi K_S$ in a model III 2HDM | Minor changes, version to appear in PRD | Phys.Rev. D68 (2003) 114020 | 10.1103/PhysRevD.68.114020 | null | hep-ph hep-ex | null | The mixing induced time dependent CP asymmetry, direct CP asymmetry, and
branching ratio in $B \to \Phi K_S$ in a model III 2HDM are calculated, in
particular, neutral Higgs boson contributions are included. It is shown that
satisfying all the relevant experimental constraints, for time dependent CP
asymmetry $S_{\phi K}$ the model III can agree with the present data, $S_{\phi
k}=-0.39\pm 0.41$, within the $1\sigma$ error, and the direct CP asymmetry
which is zero in SM can be about $ -8% \sim -20%$ in the reasonable regions of
parameters.
| [
{
"created": "Tue, 29 Jul 2003 18:01:03 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Aug 2003 16:12:11 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Sep 2003 13:17:30 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Nov 2003 14:35:47 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Huang",
"Chao-Shang",
"",
"ITP, CAS"
],
[
"Zhu",
"Shou-hua",
"",
"Carleton Uni"
]
] | The mixing induced time dependent CP asymmetry, direct CP asymmetry, and branching ratio in $B \to \Phi K_S$ in a model III 2HDM are calculated, in particular, neutral Higgs boson contributions are included. It is shown that satisfying all the relevant experimental constraints, for time dependent CP asymmetry $S_{\phi K}$ the model III can agree with the present data, $S_{\phi k}=-0.39\pm 0.41$, within the $1\sigma$ error, and the direct CP asymmetry which is zero in SM can be about $ -8% \sim -20%$ in the reasonable regions of parameters. |
0812.3371 | Fredrick Olness | Fredrick Olness, Ingo Schienbein | Heavy Quarks: Lessons Learned from HERA and Tevatron | 11 pages, 9 figures, to appear in the proceedings of the Ringberg
Workshop "New Trends in HERA Physics 2008" | null | 10.1016/j.nuclphysbps.2009.03.112 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review some of the recent developments which have enabled the heavy quark
mass to be incorporated into both the calculation of the hard-scattering cross
section and the PDFs. We compare and contrast some of the schemes that have
been used in recent global PDF analyses, and look at issues that arise when
these calculations are extended to NNLO.
| [
{
"created": "Wed, 17 Dec 2008 18:59:38 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Olness",
"Fredrick",
""
],
[
"Schienbein",
"Ingo",
""
]
] | We review some of the recent developments which have enabled the heavy quark mass to be incorporated into both the calculation of the hard-scattering cross section and the PDFs. We compare and contrast some of the schemes that have been used in recent global PDF analyses, and look at issues that arise when these calculations are extended to NNLO. |
hep-ph/0312080 | Andre Peshier | A. Peshier, B. Kampfer, G. Soff | The QCD equation of state and quark star properties | Invited talk given by A. Peshier at the NATO Advanced Research
Workshop "Superdense QCD Matter and Compact Stars", 27 September - 4 October
2003, Yerivan, Armenia | null | null | null | hep-ph | null | We review our quasiparticle model for the thermodynamics of strongly
interacting matter at high temperature, and its extrapolation to non-zero
chemical potential. Some implications of the resulting soft equation of state
of quark matter at low temperatures are pointed out.
| [
{
"created": "Fri, 5 Dec 2003 11:42:03 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Peshier",
"A.",
""
],
[
"Kampfer",
"B.",
""
],
[
"Soff",
"G.",
""
]
] | We review our quasiparticle model for the thermodynamics of strongly interacting matter at high temperature, and its extrapolation to non-zero chemical potential. Some implications of the resulting soft equation of state of quark matter at low temperatures are pointed out. |
hep-ph/9409283 | null | J. Milana and S. Nussinov | Possible Tests for $b \rightarrow s g$ Penguins via Inclusive $K$
Distributions and Exclusive Processes | 19 pages + 4 figures, UMPP \#94--033 | Phys.Rev.D51:1192-1198,1995 | 10.1103/PhysRevD.51.1192 | null | hep-ph | null | We discuss experimental signatures capable of nearly immediate study that
would discern/constrain new physics manifested via enhanced gluonic penguin
decays of the $b$.
| [
{
"created": "Mon, 12 Sep 1994 19:59:53 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Milana",
"J.",
""
],
[
"Nussinov",
"S.",
""
]
] | We discuss experimental signatures capable of nearly immediate study that would discern/constrain new physics manifested via enhanced gluonic penguin decays of the $b$. |
2202.10067 | Masaki J.S. Yang | Masaki J. S. Yang | A formula by $LDL^{T}$ decomposition for the minimal type-I seesaw
mechanism and conditions of $CP$ symmetry in an arbitrary basis | 13 pages | null | null | STUPP-21-253 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, defining a formula by $LDL^{T}$ decomposition for the minimal
type-I seesaw mechanism, we obtain conditions of $CP$ symmetry for the neutrino
mass matrix $m$ in an arbitrary basis. The conditions are found to be ${\rm
Re\,} (M_{22} a_{i} - M_{12} b_{i}) \, {\rm Im \,} ( M_{22} a_{j} - M_{12}
b_{j}) = - \det M \, {\rm Re\,} b_{i} \, {\rm Im \,} b_{j}$ or $ = - \det M \,
{\rm Im \,} b_{i} \, {\rm Re\,} b_{j}$ for the Yukawa matrix $Y_{ij} = (a_{j},
b_{j})$ and the right-handed neutrino mass matrix $M_{ij}$. In other words, the
real or imaginary part of $b_{i}$ must be proportional to the real or imaginary
part of the quantity $(M_{22} a_{i} - M_{12} b_{i})$.
| [
{
"created": "Mon, 21 Feb 2022 09:27:01 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2022 05:52:36 GMT",
"version": "v2"
}
] | 2022-04-21 | [
[
"Yang",
"Masaki J. S.",
""
]
] | In this paper, defining a formula by $LDL^{T}$ decomposition for the minimal type-I seesaw mechanism, we obtain conditions of $CP$ symmetry for the neutrino mass matrix $m$ in an arbitrary basis. The conditions are found to be ${\rm Re\,} (M_{22} a_{i} - M_{12} b_{i}) \, {\rm Im \,} ( M_{22} a_{j} - M_{12} b_{j}) = - \det M \, {\rm Re\,} b_{i} \, {\rm Im \,} b_{j}$ or $ = - \det M \, {\rm Im \,} b_{i} \, {\rm Re\,} b_{j}$ for the Yukawa matrix $Y_{ij} = (a_{j}, b_{j})$ and the right-handed neutrino mass matrix $M_{ij}$. In other words, the real or imaginary part of $b_{i}$ must be proportional to the real or imaginary part of the quantity $(M_{22} a_{i} - M_{12} b_{i})$. |
hep-ph/9910210 | Hannes Jung | S.P. Baranov (Lebedev Institute, Moscow) H. Jung (Lund Univ.), N.P.
Zotov (Moscow State University) | Charm production in the semi-hard approach of QCD and the unintegrated
gluon distribution | Latex 8 pages, 4 pages | null | null | LUNFD6/(NFFL-7176) 1999 | hep-ph | null | In the framework of semi-hard QCD approach, we present a consistent analysis
of D^* meson production at HERA energies. The consideration is based on
universal unintegrated gluon densities, which have BFKL behavior in the small x
region. Predictions of the CCFM evolution equation for D^* production are
obtained and show a good description of D^* data at HERA.
| [
{
"created": "Sat, 2 Oct 1999 08:45:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baranov",
"S. P.",
"",
"Lebedev Institute, Moscow"
],
[
"Jung",
"H.",
"",
"Lund Univ."
],
[
"Zotov",
"N. P.",
"",
"Moscow State University"
]
] | In the framework of semi-hard QCD approach, we present a consistent analysis of D^* meson production at HERA energies. The consideration is based on universal unintegrated gluon densities, which have BFKL behavior in the small x region. Predictions of the CCFM evolution equation for D^* production are obtained and show a good description of D^* data at HERA. |
hep-ph/9912244 | Afsar Abbas | Afsar Abbas | Electric charge, early universe and the Superstring Theories | Latex file, 6 pages, no figures | null | null | null | hep-ph astro-ph | null | Very recently, it has been shown by the author that the Standard Model Higgs
cannot be a physical particle. Here, on most general grounds it is established
that as per the Standard Model there is no electric charge above the
electro-weak phase transition temperature. Hence there was no electric charge
present in the early universe. The Superstring Theories are flawed in as much
as they are incompatible with this requirement. Hence the Superstring Theories
are inconsistent with this basic structure and requirement of the Standard
Model.
| [
{
"created": "Sun, 5 Dec 1999 13:52:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Abbas",
"Afsar",
""
]
] | Very recently, it has been shown by the author that the Standard Model Higgs cannot be a physical particle. Here, on most general grounds it is established that as per the Standard Model there is no electric charge above the electro-weak phase transition temperature. Hence there was no electric charge present in the early universe. The Superstring Theories are flawed in as much as they are incompatible with this requirement. Hence the Superstring Theories are inconsistent with this basic structure and requirement of the Standard Model. |
2009.07909 | Michael Clark | Michael Clark, Amanda Depoian, Bahaa Elshimy, Abigail Kopec, Rafael F.
Lang, Shengchao Li, Juehang Qin | Direct Detection Limits on Heavy Dark Matter | 4 pages, 4 figures. Updated version, following the errata published
in Phys. Rev. D 104, 129903 | Phys. Rev. D 102, 123026 (2020), including erratum Phys. Rev. D
104, 129903 | 10.1103/PhysRevD.102.123026 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multiply-interacting massive particles (MIMPs) are heavy (>10^10 GeV/c^2)
dark matter particles that interact strongly with regular matter, but may have
evaded detection due to the low number density required to make up the local
dark matter halo. These particles could leave track-like signatures in current
experiments, similar to lightly-ionizing particles. We show that previously
calculated limits from the MAJORANA Demonstrator on the flux of
lightly-ionizing particles can be used to exclude MIMP dark matter parameter
space up to a mass of 10^15 GeV/c^2. We also calculate limits from the standard
XENON1T analysis in this high-mass regime, properly taking into account flux
limitations and multi-scatter effects. Finally, we show that a dedicated MIMP
analysis using the XENON1T dark matter search could probe unexplored parameter
space up to masses of 10^18 GeV/c^2.
| [
{
"created": "Wed, 16 Sep 2020 19:38:01 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Dec 2020 16:40:54 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jan 2022 20:49:09 GMT",
"version": "v3"
}
] | 2022-01-12 | [
[
"Clark",
"Michael",
""
],
[
"Depoian",
"Amanda",
""
],
[
"Elshimy",
"Bahaa",
""
],
[
"Kopec",
"Abigail",
""
],
[
"Lang",
"Rafael F.",
""
],
[
"Li",
"Shengchao",
""
],
[
"Qin",
"Juehang",
""
]
] | Multiply-interacting massive particles (MIMPs) are heavy (>10^10 GeV/c^2) dark matter particles that interact strongly with regular matter, but may have evaded detection due to the low number density required to make up the local dark matter halo. These particles could leave track-like signatures in current experiments, similar to lightly-ionizing particles. We show that previously calculated limits from the MAJORANA Demonstrator on the flux of lightly-ionizing particles can be used to exclude MIMP dark matter parameter space up to a mass of 10^15 GeV/c^2. We also calculate limits from the standard XENON1T analysis in this high-mass regime, properly taking into account flux limitations and multi-scatter effects. Finally, we show that a dedicated MIMP analysis using the XENON1T dark matter search could probe unexplored parameter space up to masses of 10^18 GeV/c^2. |
hep-ph/0109173 | Michael McNeil Forbes | Michael McNeil Forbes and Ariel R. Zhitnitsky | Global Strings in High Density QCD | LaTeX JHEP-format (26 pages) Option in source for REVTeX4 format | Phys.Rev. D65 (2002) 085009 | 10.1103/PhysRevD.65.085009 | MIT-CTP-3190 | hep-ph astro-ph hep-th nucl-th | null | We show that several types of global strings occur in colour superconducting
quark matter due to the spontaneous violation of relevant U(1) symmetries.
These include the baryon U(1)_B, and approximate axial U(1)_A symmetries as
well as an approximate U(1)_S arising from kaon condensation. We discuss some
general properties of these strings and their interactions. In particular, we
demonstrate that the U(1)_A strings behave as superconducting strings. We draw
some parallels between these strings and global cosmological strings and
discuss some possible implications of these strings to the physics in neutron
star cores.
| [
{
"created": "Wed, 19 Sep 2001 19:07:32 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Forbes",
"Michael McNeil",
""
],
[
"Zhitnitsky",
"Ariel R.",
""
]
] | We show that several types of global strings occur in colour superconducting quark matter due to the spontaneous violation of relevant U(1) symmetries. These include the baryon U(1)_B, and approximate axial U(1)_A symmetries as well as an approximate U(1)_S arising from kaon condensation. We discuss some general properties of these strings and their interactions. In particular, we demonstrate that the U(1)_A strings behave as superconducting strings. We draw some parallels between these strings and global cosmological strings and discuss some possible implications of these strings to the physics in neutron star cores. |
1404.5230 | Xin Gao | Xin Gao, Tianjun Li, Pramod Shukla | Fractional chaotic inflation in the lights of PLANCK and BICEP2 | 16 pages, 5 figures, references added, published in PLB | Phys. Lett. B 738 (2014) 412-417 | 10.1016/j.physletb.2014.10.007 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the lights of current BICEP2 observations accompanied with the PLANCK
satellite results, it has been observed that the simple single field chaotic
inflationary models provide a good agreement with their spectral index n_s and
large tensor-to-scalar ratio r (0.15 <r <0.26). To explore the other simple
models, we consider the fractional-chaotic inflationary potentials of the form
V_0 phi^(a/b) where a and b are relatively prime. We show that such kind of
inflaton potentials can be realized elegantly in the supergravity framework
with generalized shift symmetry and a nature bound a/b < 4 for consistency.
Especially, for the number of e-folding from 50 to 60 and some a/b from 2 to 3,
our predictions are nicely within at least 1 $\sigma$ region in the r-n_s
plane. We also present a systematic investigation of such chaotic inflationary
models with fractional exponents to explore the possibilities for the
enhancement in the magnitude of running of spectral index (\alpha_{n_s}) beyond
the simplistic models.
| [
{
"created": "Mon, 21 Apr 2014 16:01:35 GMT",
"version": "v1"
},
{
"created": "Thu, 1 May 2014 15:46:48 GMT",
"version": "v2"
},
{
"created": "Sun, 25 May 2014 15:52:43 GMT",
"version": "v3"
},
{
"created": "Fri, 3 Oct 2014 21:51:58 GMT",
"version": "v4"
},
{
"cre... | 2014-10-20 | [
[
"Gao",
"Xin",
""
],
[
"Li",
"Tianjun",
""
],
[
"Shukla",
"Pramod",
""
]
] | In the lights of current BICEP2 observations accompanied with the PLANCK satellite results, it has been observed that the simple single field chaotic inflationary models provide a good agreement with their spectral index n_s and large tensor-to-scalar ratio r (0.15 <r <0.26). To explore the other simple models, we consider the fractional-chaotic inflationary potentials of the form V_0 phi^(a/b) where a and b are relatively prime. We show that such kind of inflaton potentials can be realized elegantly in the supergravity framework with generalized shift symmetry and a nature bound a/b < 4 for consistency. Especially, for the number of e-folding from 50 to 60 and some a/b from 2 to 3, our predictions are nicely within at least 1 $\sigma$ region in the r-n_s plane. We also present a systematic investigation of such chaotic inflationary models with fractional exponents to explore the possibilities for the enhancement in the magnitude of running of spectral index (\alpha_{n_s}) beyond the simplistic models. |
1912.02106 | Per Osland | A.A. Pankov, P. Osland, I.A. Serenkova and V.A. Bednyakov | High-precision limits on $W$-$W'$ and $Z$-$Z'$ mixing from diboson
production using the full LHC Run 2 ATLAS data set | 20 pages, 6 figures. arXiv admin note: substantial text overlap with
arXiv:1904.01432, arXiv:1809.08933. v2: clarifications, version published in
EPJC | null | 10.1140/epjc/s10052-020-8075-7 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The full ATLAS Run 2 data set with time-integrated luminosity of 139
fb$^{-1}$ in the diboson channels in hadronic final states is used to probe a
simple model with an extended gauge sector (EGM), proposed by Altarelli et al.,
and often taken as a convenient benchmark by experimentalists. This model
accommodates new charged $W'$ and neutral $Z'$ vector bosons with modified
trilinear Standard Model gauge couplings, decaying into electroweak gauge boson
pairs $WZ$ or $WW$, where $W$/$Z$ decay hadronically. Exclusion limits at the
95% C.L. on the $Z'$ and $W'$ resonance production cross section times
branching ratio to electroweak gauge boson pairs in the mass range of $\sim$ 1
- 5 TeV are here converted to constraints on $W$-$W'$ and $Z$-$Z'$ mixing
parameters and masses for the EGM. We present exclusion regions on the
parameter space of the $W'$ and $Z'$ by using the full Run 2 data set comprised
of $pp$ collisions at $\sqrt{s}=13$ TeV and recorded by the ATLAS detector at
the CERN LHC. The obtained exclusion regions are significantly extended
compared to those obtained from the previous analysis performed with Tevatron
data as well as with LHC data collected at 7 and 8 TeV in Run 1 and are the
most stringent bounds to date.
| [
{
"created": "Tue, 3 Dec 2019 06:34:15 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jun 2020 15:39:53 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Pankov",
"A. A.",
""
],
[
"Osland",
"P.",
""
],
[
"Serenkova",
"I. A.",
""
],
[
"Bednyakov",
"V. A.",
""
]
] | The full ATLAS Run 2 data set with time-integrated luminosity of 139 fb$^{-1}$ in the diboson channels in hadronic final states is used to probe a simple model with an extended gauge sector (EGM), proposed by Altarelli et al., and often taken as a convenient benchmark by experimentalists. This model accommodates new charged $W'$ and neutral $Z'$ vector bosons with modified trilinear Standard Model gauge couplings, decaying into electroweak gauge boson pairs $WZ$ or $WW$, where $W$/$Z$ decay hadronically. Exclusion limits at the 95% C.L. on the $Z'$ and $W'$ resonance production cross section times branching ratio to electroweak gauge boson pairs in the mass range of $\sim$ 1 - 5 TeV are here converted to constraints on $W$-$W'$ and $Z$-$Z'$ mixing parameters and masses for the EGM. We present exclusion regions on the parameter space of the $W'$ and $Z'$ by using the full Run 2 data set comprised of $pp$ collisions at $\sqrt{s}=13$ TeV and recorded by the ATLAS detector at the CERN LHC. The obtained exclusion regions are significantly extended compared to those obtained from the previous analysis performed with Tevatron data as well as with LHC data collected at 7 and 8 TeV in Run 1 and are the most stringent bounds to date. |
1804.04919 | Yicong Sui | Yicong Sui, P. S. Bhupal Dev | A Combined Astrophysical and Dark Matter Interpretation of the IceCube
HESE and Throughgoing Muon Events | 27 pages, 6 figures, 2 tables | null | 10.1088/1475-7516/2018/07/020 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a combined likelihood analysis for the IceCube 6-year high-energy
starting events (HESE) and 8-year throughgoing muon events above 10 TeV using a
two-component neutrino flux model. The two-component flux can be motivated
either from purely astrophysical sources or due to a beyond Standard Model
contribution, such as decaying heavy dark matter. We find that the
astrophysical plus dark matter interpretation is mildly preferred by the
current data over the purely astrophysical explanation. As for the
astrophysical neutrinos, we consider two different source flavor compositions
corresponding to the standard pion decay and muon-damped pion decay sources. We
find that the latter is slightly preferred over the former as the high-energy
component, while the low-energy component does not show any such preference. We
also take into account the multi-messenger gamma-ray constraints and find that
our two-component fit is compatible with these constraints, whereas the
single-component power-law bestfit to the HESE data is ruled out. The
astrophysical plus dark matter interpretation of the two-component flux is
found to be mildly preferred by the current data and the gamma-ray constraints
over the purely astrophysical explanation.
| [
{
"created": "Fri, 13 Apr 2018 12:49:46 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2018 17:12:00 GMT",
"version": "v2"
}
] | 2018-07-25 | [
[
"Sui",
"Yicong",
""
],
[
"Dev",
"P. S. Bhupal",
""
]
] | We perform a combined likelihood analysis for the IceCube 6-year high-energy starting events (HESE) and 8-year throughgoing muon events above 10 TeV using a two-component neutrino flux model. The two-component flux can be motivated either from purely astrophysical sources or due to a beyond Standard Model contribution, such as decaying heavy dark matter. We find that the astrophysical plus dark matter interpretation is mildly preferred by the current data over the purely astrophysical explanation. As for the astrophysical neutrinos, we consider two different source flavor compositions corresponding to the standard pion decay and muon-damped pion decay sources. We find that the latter is slightly preferred over the former as the high-energy component, while the low-energy component does not show any such preference. We also take into account the multi-messenger gamma-ray constraints and find that our two-component fit is compatible with these constraints, whereas the single-component power-law bestfit to the HESE data is ruled out. The astrophysical plus dark matter interpretation of the two-component flux is found to be mildly preferred by the current data and the gamma-ray constraints over the purely astrophysical explanation. |
hep-ph/9312353 | Paul F. Mende | Benjamin Grinstein and Paul F. Mende | Exact Heavy to Light Meson Form Factors in the Combined Heavy Quark,
Large $N_c$ and Chiral Limits | 12 pages (harvmac), Brown-HET-928 | null | null | null | hep-ph | null | We demonstrate that the form factors of local operators between a heavy meson
state (like the~$B$) and a light pseudoscalar state (like the pion) are given
exactly by a single pole form in the combined heavy quark, large $N_c$ (number
of colors) and chiral limits. We discuss the deviations from this exact result
from finite heavy quark masses, non-zero light quark masses and finite $N_c$.
We comment on some implications of this result.
| [
{
"created": "Thu, 30 Dec 1993 09:15:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grinstein",
"Benjamin",
""
],
[
"Mende",
"Paul F.",
""
]
] | We demonstrate that the form factors of local operators between a heavy meson state (like the~$B$) and a light pseudoscalar state (like the pion) are given exactly by a single pole form in the combined heavy quark, large $N_c$ (number of colors) and chiral limits. We discuss the deviations from this exact result from finite heavy quark masses, non-zero light quark masses and finite $N_c$. We comment on some implications of this result. |
0810.0588 | Keisho Hidaka | K. Hidaka (Tokyo Gakugei Univ.) | Impact of slepton generation mixing on the search for sneutrinos | Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages,
LaTeX, 3 eps figures, modified version with some minor changes specific to
ICHEP08 Proceedings | null | null | TGU-37 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a systematic study of sneutrino production and decays in the
Minimal Supersymmetric Standard Model (MSSM) with lepton flavour violation
(LFV). We study bosonic decays of sneutrinos as well as fermionic ones. We show
that the effect of slepton generation mixing on the sneutrino production and
decays can be quite large in a significant part of the MSSM parameter space
despite the very strong experimental limits on LFV processes. This could have
an important impact on the search for sneutrinos and the determination of the
MSSM parameters at LHC and future colliders, such as ILC, CLIC and muon
collider.
| [
{
"created": "Fri, 3 Oct 2008 08:53:57 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jan 2009 06:17:06 GMT",
"version": "v2"
}
] | 2009-01-24 | [
[
"Hidaka",
"K.",
"",
"Tokyo Gakugei Univ."
]
] | We perform a systematic study of sneutrino production and decays in the Minimal Supersymmetric Standard Model (MSSM) with lepton flavour violation (LFV). We study bosonic decays of sneutrinos as well as fermionic ones. We show that the effect of slepton generation mixing on the sneutrino production and decays can be quite large in a significant part of the MSSM parameter space despite the very strong experimental limits on LFV processes. This could have an important impact on the search for sneutrinos and the determination of the MSSM parameters at LHC and future colliders, such as ILC, CLIC and muon collider. |
hep-ph/0110291 | Enrique Ruiz Arriola | R. M. Davidson (Department of Physics, Applied Physics and Astronomy,
Rensselaer Polytechnic Institute, Troy, New York) and E. Ruiz Arriola
(Departamento de Fisica Moderna, Universidad de Granada, Spain.) | Parton Distributions Functions of Pion, Kaon and Eta pseudoscalar mesons
in the NJL model | (Latex, epsfig) 17 pages, 7 figures | Acta Phys.Polon.B33:1791-1808,2002 | null | UG/DFM-20 2001 | hep-ph | null | Parton distributions of pseudoscalar pi,K and eta mesons obtained within the
NJL model using the Pauli-Villars regularization method are analyzed in terms
of LO and NLO evolution, and the valence sea quark and gluon parton
distributions for the pion are obtained at Q^2 = 4 GeV^2 and compared to
existing parametrizations at that scale. Surprisingly, the NLO order effects
turn out to be small compared to the LO ones. The valence distributions are in
good agreement with experimental analyses, but the gluon and sea distributions
come out to be softer in the high-x region and harder in the low-x region than
the experimental analyses suggest.
| [
{
"created": "Tue, 23 Oct 2001 08:08:31 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Davidson",
"R. M.",
"",
"Department of Physics, Applied Physics and Astronomy,\n Rensselaer Polytechnic Institute, Troy, New York"
],
[
"Arriola",
"E. Ruiz",
"",
"Departamento de Fisica Moderna, Universidad de Granada, Spain."
]
] | Parton distributions of pseudoscalar pi,K and eta mesons obtained within the NJL model using the Pauli-Villars regularization method are analyzed in terms of LO and NLO evolution, and the valence sea quark and gluon parton distributions for the pion are obtained at Q^2 = 4 GeV^2 and compared to existing parametrizations at that scale. Surprisingly, the NLO order effects turn out to be small compared to the LO ones. The valence distributions are in good agreement with experimental analyses, but the gluon and sea distributions come out to be softer in the high-x region and harder in the low-x region than the experimental analyses suggest. |
1201.1235 | Marek G\'o\'zd\'z | M. G\'o\'zd\'z and W. A. Kami\'nski | Fermion-boson loops with bilinear R-parity violation leading to Majorana
neutrino mass and magnetic moments | I've decided to move the collection of my papers to arXiv for easier
access. Proceedings of the Nuclear Physics Workshop in Kazimierz Dolny,
Poland, 2007 | Int. J. Mod. Phys. E 17 (2008) 276 | 10.1142/S021830130800980X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytic expressions corresponding to a set of one loop Feynman
diagrams, built within R-parity violating (RpV) minimal supersymmetric standard
model (MSSM). Diagrams involve both bilinear and trilinear RpV couplings and
represent Majorana neutrino masses and magnetic moments.
| [
{
"created": "Thu, 5 Jan 2012 17:59:52 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Góźdź",
"M.",
""
],
[
"Kamiński",
"W. A.",
""
]
] | We present analytic expressions corresponding to a set of one loop Feynman diagrams, built within R-parity violating (RpV) minimal supersymmetric standard model (MSSM). Diagrams involve both bilinear and trilinear RpV couplings and represent Majorana neutrino masses and magnetic moments. |
hep-ph/0512247 | Felipe J. Llanes-Estrada | Stanley J. Brodsky (Stanford Linear Accelerator Center) and Felipe J.
Llanes-Estrada (Univ. Complutense Madrid) | Renormalization Scale-Fixing for Complex Scattering Amplitudes | Second version, to be published in EPJC. several new comments and
references | Eur.Phys.J.C46:751,2006 | 10.1140/epjc/s2006-02520-0 | SLAC-PUB-11605 | hep-ph | null | We show how to fix the renormalization scale for hard-scattering exclusive
processes such as deeply virtual meson electroproduction by applying the BLM
prescription to the imaginary part of the scattering amplitude and employing a
fixed-t dispersion relation to obtain the scale-fixed real part. In this way we
resolve the ambiguity in BLM renormalization scale-setting for complex
scattering amplitudes. We illustrate this by computing the H generalized parton
distribution at leading twist in an analytic quark-diquark model for the
parton-proton scattering amplitude which can incorporate Regge exchange
contributions characteristic of the deep inelastic structure functions.
| [
{
"created": "Tue, 20 Dec 2005 08:26:42 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Mar 2006 14:43:49 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Brodsky",
"Stanley J.",
"",
"Stanford Linear Accelerator Center"
],
[
"Llanes-Estrada",
"Felipe J.",
"",
"Univ. Complutense Madrid"
]
] | We show how to fix the renormalization scale for hard-scattering exclusive processes such as deeply virtual meson electroproduction by applying the BLM prescription to the imaginary part of the scattering amplitude and employing a fixed-t dispersion relation to obtain the scale-fixed real part. In this way we resolve the ambiguity in BLM renormalization scale-setting for complex scattering amplitudes. We illustrate this by computing the H generalized parton distribution at leading twist in an analytic quark-diquark model for the parton-proton scattering amplitude which can incorporate Regge exchange contributions characteristic of the deep inelastic structure functions. |
0908.3853 | Ulrich Jentschura | U. D. Jentschura and V. G. Serbo | Nuclear form factor, validity of the equivalent photon approximation and
Coulomb corrections to muon pair production in photon-nucleus and
nucleus-nucleus collisions | 9 pages, LaTeX | Eur.Phys.J.C64:309-317,2009 | 10.1140/epjc/s10052-009-1147-3 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in detail the influence of the nuclear form factor both on the Born
cross section and on the Coulomb corrections to the photo-production of muon
pairs off heavy nuclei (gamma Z -> mu+ mu- Z$) and in heavy-ion collisions (ZZ
-> ZZ mu+ mu-). Our findings indicate a number of issues which have not been
sufficiently described as yet in the literature: (i) the use of a realistic
form factor, based on the Fermi charge distribution for the nucleus, is
absolutely indispensable for reliable theoretical predictions; (ii) we checked
quantitatively that the equivalent photon approximation has a very good
accuracy for the discussed processes; and (iii) we present a leading
logarithmic calculation of the Coulomb corrections which correspond to
multi-photon exchange of the produced mu+/- with the nuclei. These corrections
are found to be small (on the percent level). Our result justifies using the
Born approximation for numerical simulations of the discussed process at the
RHIC and LHC colliders. Finally, we calculate the total cross section for muon
pair production at RHIC and LHC.
| [
{
"created": "Wed, 26 Aug 2009 15:39:38 GMT",
"version": "v1"
}
] | 2009-11-16 | [
[
"Jentschura",
"U. D.",
""
],
[
"Serbo",
"V. G.",
""
]
] | We study in detail the influence of the nuclear form factor both on the Born cross section and on the Coulomb corrections to the photo-production of muon pairs off heavy nuclei (gamma Z -> mu+ mu- Z$) and in heavy-ion collisions (ZZ -> ZZ mu+ mu-). Our findings indicate a number of issues which have not been sufficiently described as yet in the literature: (i) the use of a realistic form factor, based on the Fermi charge distribution for the nucleus, is absolutely indispensable for reliable theoretical predictions; (ii) we checked quantitatively that the equivalent photon approximation has a very good accuracy for the discussed processes; and (iii) we present a leading logarithmic calculation of the Coulomb corrections which correspond to multi-photon exchange of the produced mu+/- with the nuclei. These corrections are found to be small (on the percent level). Our result justifies using the Born approximation for numerical simulations of the discussed process at the RHIC and LHC colliders. Finally, we calculate the total cross section for muon pair production at RHIC and LHC. |
hep-ph/0202183 | Krutov A. F. | A.F. Krutov and V.E. Troitsky | Extraction of the neutron charge form factor from the charge form factor
of deuteron | LaTeX2e, 12 pages, 2 figures, table | Eur.Phys.J.A16:285-290,2003 | 10.1140/epja/i2002-10077-9 | null | hep-ph hep-ex nucl-ex nucl-th | null | We extract the neutron charge form factor from the charge form factor of
deuteron obtained from $T_{20}(Q^2)$ data at $0\le Q^2\le$ 1.717 (GeV$^2$). The
extraction is based on the relativistic impulse approximation in the instant
form of the relativistic Hamiltonian dynamics. Our results (12 new points) are
compatible with existing values of the neutron charge form factor of other
authors. We propose a fit for the whole set (35 points) taking into account the
data for the slope of the form factor at $Q^2 = 0$.
| [
{
"created": "Tue, 19 Feb 2002 11:59:46 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Krutov",
"A. F.",
""
],
[
"Troitsky",
"V. E.",
""
]
] | We extract the neutron charge form factor from the charge form factor of deuteron obtained from $T_{20}(Q^2)$ data at $0\le Q^2\le$ 1.717 (GeV$^2$). The extraction is based on the relativistic impulse approximation in the instant form of the relativistic Hamiltonian dynamics. Our results (12 new points) are compatible with existing values of the neutron charge form factor of other authors. We propose a fit for the whole set (35 points) taking into account the data for the slope of the form factor at $Q^2 = 0$. |
hep-ph/0002264 | Martin Hirsch | M. Hirsch, J. C. Romao and J.W.F. Valle | Bilinear R-parity violating SUSY: Neutrinoless double beta decay in the
light of solar and atmospheric neutrino data | 1 reference added, enlarged discussion of loops | Phys.Lett.B486:255-262,2000 | 10.1016/S0370-2693(00)00781-4 | FTUV/00-14 and IFIC/00-15 | hep-ph | null | Neutrinoless double beta ($\znbb$) decay is considered within bilinear
R-parity breaking supersymmetry, including the full one-loop corrections to the
neutrino-neutralino mass matrix. Expected rates for $\znbb$ decay in this model
are discussed in light of recent atmospheric and solar neutrino data. We
conclude that (a) tree-level calculations for $\znbb$ decay within the bilinear
model are not reliable in the range of parameters preferred by current solar
and atmospheric neutrino problems. And (b) if the solar and atmospheric
neutrino problems are to be solved within bilinear R-parity violating SUSY the
expected rates for $\znbb$ decay are very low; the effective Majorana neutrino
mass at most 0.01 eV and typical values being one order of magnitude lower.
Observing $\znbb$ decay in the next round of experiments therefore would rule
out the bilinear R-parity violating supersymmetric model as an explanation for
solar and atmospheric neutrino oscillations, as well as any hierarchical scheme
for neutrino masses, unless new neutrino interactions are present.
| [
{
"created": "Fri, 25 Feb 2000 11:19:51 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2000 17:17:17 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Hirsch",
"M.",
""
],
[
"Romao",
"J. C.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | Neutrinoless double beta ($\znbb$) decay is considered within bilinear R-parity breaking supersymmetry, including the full one-loop corrections to the neutrino-neutralino mass matrix. Expected rates for $\znbb$ decay in this model are discussed in light of recent atmospheric and solar neutrino data. We conclude that (a) tree-level calculations for $\znbb$ decay within the bilinear model are not reliable in the range of parameters preferred by current solar and atmospheric neutrino problems. And (b) if the solar and atmospheric neutrino problems are to be solved within bilinear R-parity violating SUSY the expected rates for $\znbb$ decay are very low; the effective Majorana neutrino mass at most 0.01 eV and typical values being one order of magnitude lower. Observing $\znbb$ decay in the next round of experiments therefore would rule out the bilinear R-parity violating supersymmetric model as an explanation for solar and atmospheric neutrino oscillations, as well as any hierarchical scheme for neutrino masses, unless new neutrino interactions are present. |
1011.4574 | Leonid Slad | L.M. Slad | Electromagnetic properties of non-Dirac particles with rest spin 1/2 | 18 pages, 2 figures | Theor.Math.Phys.165:1275-1292,2010 | 10.1007/s11232-010-0109-0 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We resolve a number of questions related to an analytic description of
electromagnetic form factors of non-Dirac particles with the rest spin 1/2. We
find the general structure of a matrix antisymmetric tensor operator. We obtain
two recurrence relations for matrix elements of finite transformations of the
proper Lorentz group and explicit formulas for a certain set of such elements.
Within the theory of fields with double symmetry, we discuss writing the
components of wave vectors of particles in the form of infinite continued
fractions. We show that for $Q^{2} \leq 0.5$ (GeV/c)$^{2}$, where $Q^{2}$ is
the transferred momentum squared, electromagnetic form factors that decrease as
$Q^{2}$ increases and are close to those experimentally observed in the proton
can be obtained without explicitly introducing an internal particle structure.
| [
{
"created": "Sat, 20 Nov 2010 09:53:29 GMT",
"version": "v1"
}
] | 2011-07-13 | [
[
"Slad",
"L. M.",
""
]
] | We resolve a number of questions related to an analytic description of electromagnetic form factors of non-Dirac particles with the rest spin 1/2. We find the general structure of a matrix antisymmetric tensor operator. We obtain two recurrence relations for matrix elements of finite transformations of the proper Lorentz group and explicit formulas for a certain set of such elements. Within the theory of fields with double symmetry, we discuss writing the components of wave vectors of particles in the form of infinite continued fractions. We show that for $Q^{2} \leq 0.5$ (GeV/c)$^{2}$, where $Q^{2}$ is the transferred momentum squared, electromagnetic form factors that decrease as $Q^{2}$ increases and are close to those experimentally observed in the proton can be obtained without explicitly introducing an internal particle structure. |
hep-ph/0110190 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Heavy quark potential and mass spectra of heavy mesons | 10 pages, plenary talk at the IXth International Conference on Hadron
Spectroscopy (August 25-September 1, 2001) - HADRON 2001, Protvino, Russia | AIP Conf.Proc. 619 (2002) 336-345 | 10.1063/1.1482462 | null | hep-ph | null | The relativistic quark model is presented. The quark-antiquark potential for
the Schroedinger-like equation is constructed with the account of retardation
effects and one-loop radiative corrections. It consists of the one-gluon
exchange part and the confining part which is the mixture of the Lorentz scalar
and Lorentz vector contributions. The latter contains both the Dirac and Pauli
terms. In the v^2/c^2 approximation the mass spectra of heavy quarkonia
(charmonium and bottomonium) are calculated in good agreement with experiment.
In the case of heavy-light mesons (B and D) the light quark is treated
completely relativistically and only the expansion in the inverse heavy quark
mass is used. The mass spectra of the ground and excited states of D, D_s, B,
B_s mesons are calculated. They exhibit some features of the so-called ``level
inversion''. The obtained results are generally in accord with experimental
data. Still there exist some discrepancies between measurements of different
collaborations.
| [
{
"created": "Mon, 15 Oct 2001 13:52:45 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] | The relativistic quark model is presented. The quark-antiquark potential for the Schroedinger-like equation is constructed with the account of retardation effects and one-loop radiative corrections. It consists of the one-gluon exchange part and the confining part which is the mixture of the Lorentz scalar and Lorentz vector contributions. The latter contains both the Dirac and Pauli terms. In the v^2/c^2 approximation the mass spectra of heavy quarkonia (charmonium and bottomonium) are calculated in good agreement with experiment. In the case of heavy-light mesons (B and D) the light quark is treated completely relativistically and only the expansion in the inverse heavy quark mass is used. The mass spectra of the ground and excited states of D, D_s, B, B_s mesons are calculated. They exhibit some features of the so-called ``level inversion''. The obtained results are generally in accord with experimental data. Still there exist some discrepancies between measurements of different collaborations. |
2211.04099 | Raghav Chaturvedi Dr. | Raghav Chaturvedi, Ajay Kumar Rai | $B_c$ meson spectroscopy motivated by general features of pNRQCD | null | null | 10.1140/epja/s10050-022-00884-7 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the present article the mass spectrum, decay constant, weak decay widths,
life time and branching fraction ratios and electromagnetic transition widths
are calculated for ground and radially excited $B_c$ meson. To calculate the
above properties the Schr\"{o}dinger equation has been solved numerically for
the potential. The potential employed consists of relativistic correction in
the framework of pNRQCD, added to the Cornell potential. The calculated results
are compared with available experimental and theoretical results.
| [
{
"created": "Tue, 8 Nov 2022 08:58:43 GMT",
"version": "v1"
}
] | 2022-12-14 | [
[
"Chaturvedi",
"Raghav",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | In the present article the mass spectrum, decay constant, weak decay widths, life time and branching fraction ratios and electromagnetic transition widths are calculated for ground and radially excited $B_c$ meson. To calculate the above properties the Schr\"{o}dinger equation has been solved numerically for the potential. The potential employed consists of relativistic correction in the framework of pNRQCD, added to the Cornell potential. The calculated results are compared with available experimental and theoretical results. |
1103.0969 | Ben Allanach PhD | B.C. Allanach, T.J. Khoo, C.G. Lester, S.L. Williams | The impact of the ATLAS zero-lepton, jets and missing momentum search on
a CMSSM fit | 16 pages, 7 figures. v2 has bigger figures and fixed typos. v3 has
clarified explanation of our handling of signal systematics | JHEP06(2011)035 | 10.1007/JHEP06(2011)035 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent ATLAS data significantly extend the exclusion limits for
supersymmetric particles. We examine the impact of such data on global fits of
the constrained minimal supersymmetric standard model (CMSSM) to indirect and
cosmological data. We calculate the likelihood map of the ATLAS search, taking
into account systematic errors on the signal and on the background. We validate
our calculation against the ATLAS determinaton of 95% confidence level
exclusion contours. A previous CMSSM global fit is then re-weighted by the
likelihood map, which takes a bite at the high probability density region of
the global fit, pushing scalar and gaugino masses up.
| [
{
"created": "Fri, 4 Mar 2011 19:57:31 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2011 10:15:17 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Apr 2011 10:27:50 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Allanach",
"B. C.",
""
],
[
"Khoo",
"T. J.",
""
],
[
"Lester",
"C. G.",
""
],
[
"Williams",
"S. L.",
""
]
] | Recent ATLAS data significantly extend the exclusion limits for supersymmetric particles. We examine the impact of such data on global fits of the constrained minimal supersymmetric standard model (CMSSM) to indirect and cosmological data. We calculate the likelihood map of the ATLAS search, taking into account systematic errors on the signal and on the background. We validate our calculation against the ATLAS determinaton of 95% confidence level exclusion contours. A previous CMSSM global fit is then re-weighted by the likelihood map, which takes a bite at the high probability density region of the global fit, pushing scalar and gaugino masses up. |
hep-ph/0512337 | Branimir Zauner | S. Ceci, A. Svarc and B. Zauner | The re-analysis of the 1700 MeV structure of the P11 partial wave using
the piN->KLambda production data | 17 pages, 3 figures; Accepted for publication in Few Body Systems | FewBodySys.39:27-43,2006 | 10.1007/s00601-006-0153-3 | null | hep-ph | null | We have used the Breit-Wigner resonance model with S11, P11 and P13
resonances in the s-channel to re-analyze the old piN -> KLambda data with the
aim to establish the origin of the prominent structure in the total cross
section in the vicinity of 1700 MeV. In this paper we show that, at least in
the Breit-Wigner resonance model, it is not possible to achieve the detailed
reproduction of the narrow 1700 MeV total cross section peak using the standard
partial widths. We have found the new set of resonance parameters enforcing the
experimentally observed structure of the total cross section data
simultaneously with the linear dependence of the differential cross sections
with the cos(Theta) in the energy range 1650 MeV < W < 1800 MeV. The result is
that the P13 partial wave has been strongly attenuated in this model. To
understand the phenomenon, a much narrower width of a resonant state, the
N(1710) P11 in our case, is required, but then the agreement of the model
predictions with total cross section data at higher energies is lost. One way
out is to allow for the existence of the second P11 resonance in that energy
range. The same feature is shown by the polarization data. Analyzing the qqq or
qqqq(qbar) nature of the recommended narrow P11 structure in the neighbourhood
of 1700 MeV we re-open (remind of) the possibility that another P11 resonant
state exists in addition to the standard N(1710) P11 PDG-resonance, and that
one of the two states can be identified with the yet undiscovered cryptoexotic
pentaquark state. To clarify the situation, we strongly recommend remeasurement
of the piN -> KLambda process in the energy range 1650 MeV < W < 1800 MeV.
| [
{
"created": "Tue, 27 Dec 2005 12:16:42 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ceci",
"S.",
""
],
[
"Svarc",
"A.",
""
],
[
"Zauner",
"B.",
""
]
] | We have used the Breit-Wigner resonance model with S11, P11 and P13 resonances in the s-channel to re-analyze the old piN -> KLambda data with the aim to establish the origin of the prominent structure in the total cross section in the vicinity of 1700 MeV. In this paper we show that, at least in the Breit-Wigner resonance model, it is not possible to achieve the detailed reproduction of the narrow 1700 MeV total cross section peak using the standard partial widths. We have found the new set of resonance parameters enforcing the experimentally observed structure of the total cross section data simultaneously with the linear dependence of the differential cross sections with the cos(Theta) in the energy range 1650 MeV < W < 1800 MeV. The result is that the P13 partial wave has been strongly attenuated in this model. To understand the phenomenon, a much narrower width of a resonant state, the N(1710) P11 in our case, is required, but then the agreement of the model predictions with total cross section data at higher energies is lost. One way out is to allow for the existence of the second P11 resonance in that energy range. The same feature is shown by the polarization data. Analyzing the qqq or qqqq(qbar) nature of the recommended narrow P11 structure in the neighbourhood of 1700 MeV we re-open (remind of) the possibility that another P11 resonant state exists in addition to the standard N(1710) P11 PDG-resonance, and that one of the two states can be identified with the yet undiscovered cryptoexotic pentaquark state. To clarify the situation, we strongly recommend remeasurement of the piN -> KLambda process in the energy range 1650 MeV < W < 1800 MeV. |
hep-ph/9706500 | null | Mayumi Aoki, Tomoko Kadoyoshi, Akio Sugamoto, Noriyuki Oshimo | Electric Dipole Moments of Neutron and Electron in Supersymmetric Model | 16 pages, To appear in the Proceedings of the KEK meetings on 'CP
violation and its origin' (1993-1997) | null | null | ICRR-Report-392-97-15, OCHA-PP-98 | hep-ph | null | The electric dipole moments (EDMs) of the neutron and the electron are
reviewed within the framework of the supersymmetric standard model (SSM) based
on grand unified theories coupled to N=1 supergravity. Taking into account
one-loop and two-loop contributions to the EDMs, we explore SSM parameter space
consistent with experiments and discuss predicted values for the EDMs.
Implications of baryon asymmetry of our universe for the EDMs are also
discussed.
| [
{
"created": "Wed, 25 Jun 1997 11:26:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aoki",
"Mayumi",
""
],
[
"Kadoyoshi",
"Tomoko",
""
],
[
"Sugamoto",
"Akio",
""
],
[
"Oshimo",
"Noriyuki",
""
]
] | The electric dipole moments (EDMs) of the neutron and the electron are reviewed within the framework of the supersymmetric standard model (SSM) based on grand unified theories coupled to N=1 supergravity. Taking into account one-loop and two-loop contributions to the EDMs, we explore SSM parameter space consistent with experiments and discuss predicted values for the EDMs. Implications of baryon asymmetry of our universe for the EDMs are also discussed. |
hep-ph/9611286 | Ben Allanach | B. C. Allanach, G. Amelino-Camelia and O. Philipsen | Infra-red fixed point structure characterising SUSY SU(5) symmetry
breaking | 10 pages LaTeX, 4 epsf figures. 2 extra references included. Version
to appear in Phys Lett B | Phys.Lett. B393 (1997) 349-354 | 10.1016/S0370-2693(96)01630-9 | OUTP-96-63P, RAL-TR-96-090 | hep-ph | null | We analyze the one-loop renormalisation group equations for the parameters of
the Higgs potential of a supersymmetric SU(5) model with first step of symmetry
breaking involving an adjoint Higgs. In particular, we investigate the running
of the parameters that decide the first step of symmetry breaking in an attempt
to establish which symmetry-breaking scenarios would be most likely if the
model is the effective low-energy description of some more fundamental theory.
An infra-red fixed point is identified analytically. We show that it is located
at the boundary between the region of Higgs parameter space corresponding to
unbroken SU(5) and the region corresponding to the breaking of SU(5) to the
Standard Model, and we elaborate on its implications. We also observe that
certain forms of the Higgs potential discussed at tree level in the literature
are not renormalisation group invariant.
| [
{
"created": "Sat, 9 Nov 1996 11:55:29 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 1996 13:01:43 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Allanach",
"B. C.",
""
],
[
"Amelino-Camelia",
"G.",
""
],
[
"Philipsen",
"O.",
""
]
] | We analyze the one-loop renormalisation group equations for the parameters of the Higgs potential of a supersymmetric SU(5) model with first step of symmetry breaking involving an adjoint Higgs. In particular, we investigate the running of the parameters that decide the first step of symmetry breaking in an attempt to establish which symmetry-breaking scenarios would be most likely if the model is the effective low-energy description of some more fundamental theory. An infra-red fixed point is identified analytically. We show that it is located at the boundary between the region of Higgs parameter space corresponding to unbroken SU(5) and the region corresponding to the breaking of SU(5) to the Standard Model, and we elaborate on its implications. We also observe that certain forms of the Higgs potential discussed at tree level in the literature are not renormalisation group invariant. |
hep-ph/0511162 | Kiwoon Choi | Kiwoon Choi | Moduli stabilization and the pattern of soft SUSY breaking terms | 16 pages, 2 figures, Talk given at Summer Institute 2005,
Fuji-Yoshida, August 11-18, 2005 (to be published in the Proceedings) | null | null | KAIST-TH 2005/18 | hep-ph | null | In string compactification preserving N=1 SUSY, moduli fields are plausible
candidates for the messenger of SUSY breaking at low energy scales. In a
scenario that moduli-mediated SUSY breaking is significant, the pattern of soft
SUSY breaking terms depends crucially on how the light moduli with mass m
\lesssim O(8\pi^2 m_{3/2}) are stabilized. We discuss the correspondence
between the pattern of soft terms and the stabilization mechanism of light
moduli within the framework of 4D effective supergravity which is generalized
to include a SUSY-breaking uplifting potential which might be necessary to get
the phenomenologically viable de-Sitter (or Minkowski) vacuum. In some special
case, light moduli can be stabilized by controllably small perturbative
corrections to the K\"ahler potential, yielding the soft terms dominated by the
moduli-mediated contribution. In more generic situation, light moduli are
stabilized by non-perturbative effects encoded in the superpotential and a
quite different pattern of soft terms emerges: the anomaly-mediated soft terms
become comparable to the moduli-mediated ones. Such mixed moduli-anomaly
mediated soft terms lead to low energy superparticle masses qualitatively
different from those of other mediation models such as mSUGRA scenario,
gauge-mediation, and anomaly-mediation.
| [
{
"created": "Mon, 14 Nov 2005 05:13:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Choi",
"Kiwoon",
""
]
] | In string compactification preserving N=1 SUSY, moduli fields are plausible candidates for the messenger of SUSY breaking at low energy scales. In a scenario that moduli-mediated SUSY breaking is significant, the pattern of soft SUSY breaking terms depends crucially on how the light moduli with mass m \lesssim O(8\pi^2 m_{3/2}) are stabilized. We discuss the correspondence between the pattern of soft terms and the stabilization mechanism of light moduli within the framework of 4D effective supergravity which is generalized to include a SUSY-breaking uplifting potential which might be necessary to get the phenomenologically viable de-Sitter (or Minkowski) vacuum. In some special case, light moduli can be stabilized by controllably small perturbative corrections to the K\"ahler potential, yielding the soft terms dominated by the moduli-mediated contribution. In more generic situation, light moduli are stabilized by non-perturbative effects encoded in the superpotential and a quite different pattern of soft terms emerges: the anomaly-mediated soft terms become comparable to the moduli-mediated ones. Such mixed moduli-anomaly mediated soft terms lead to low energy superparticle masses qualitatively different from those of other mediation models such as mSUGRA scenario, gauge-mediation, and anomaly-mediation. |
2405.15011 | Gordon Baym | Gordon Baym, Jen-Chieh Peng, and C. J. Pethick | Beta decay and related processes from an angular momentum perspective | 7 pages, 1 figure | null | null | NORDITA 2024-018 | hep-ph hep-th nucl-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We ask the question of how angular momentum is conserved in weak interaction
processes, beginning with inverse beta decay for massless neutrinos and
electrons, in which both the incident neutrino and final electron are in
helicity eigenstates with respect, however, to {\em different} directions. To
elucidate the problem we recast the final electron state in terms of a
spherical Dirac wave. We then generalize these results to massive neutrinos and
electrons, and finally examine electron-positron annihilation processes through
the same lens. In all these processes, the apparent non-conservation of angular
momentum is a result of the quantum measurement process in which the measuring
apparatus is not in an initially well-defined quantum state, but is coupled to
the outside world; the measuring process, being outside the rules of elementary
quantum mechanics, does not allow a satisfactory accounting of the angular
momentum transfer.
| [
{
"created": "Thu, 23 May 2024 19:34:32 GMT",
"version": "v1"
}
] | 2024-05-27 | [
[
"Baym",
"Gordon",
""
],
[
"Peng",
"Jen-Chieh",
""
],
[
"Pethick",
"C. J.",
""
]
] | We ask the question of how angular momentum is conserved in weak interaction processes, beginning with inverse beta decay for massless neutrinos and electrons, in which both the incident neutrino and final electron are in helicity eigenstates with respect, however, to {\em different} directions. To elucidate the problem we recast the final electron state in terms of a spherical Dirac wave. We then generalize these results to massive neutrinos and electrons, and finally examine electron-positron annihilation processes through the same lens. In all these processes, the apparent non-conservation of angular momentum is a result of the quantum measurement process in which the measuring apparatus is not in an initially well-defined quantum state, but is coupled to the outside world; the measuring process, being outside the rules of elementary quantum mechanics, does not allow a satisfactory accounting of the angular momentum transfer. |
1501.04753 | Vicent Mateu | Andre H. Hoang, Daniel W. Kolodrubetz, Vicent Mateu, Iain W. Stewart | State-of-the-Art Predictions for C-parameter and a Determination of
alpha_s | 7 pages, 5 figures, 2 tables. Presented at the 37th International
Conference on High Energy Physics (ICHEP) | null | 10.1063/1.4938630 | UWTHPH 2014-24, MIT-CTP 4601, LPN14-122 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The C-parameter event-shape distribution for e+e- annihilation into hadrons
is computed in the framework of SCET including input from fixed-order
perturbation theory. We calculate all missing ingredients for achieving N3LL
resummation accuracy in the cross section, which is then matched onto
O(alpha_s^3) fixed-order results. Hadronization power corrections are
incorporated as a convolution with a nonperturbative shape function. Wide-angle
soft radiation effects introduce an O(Lambda_QCD) renormalon ambiguity in the
cross section, which we cure by switching to the Rgap short-distance scheme. We
also include hadron mass effects, but find their effect is rather small.
Performing fits to the tail of the C-parameter distribution for many center of
mass energies we find that the strong coupling constant is alpha_s(mZ) = 0.1123
+-0.0015, with chi^2/dof=0.99.
| [
{
"created": "Tue, 20 Jan 2015 10:20:13 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Hoang",
"Andre H.",
""
],
[
"Kolodrubetz",
"Daniel W.",
""
],
[
"Mateu",
"Vicent",
""
],
[
"Stewart",
"Iain W.",
""
]
] | The C-parameter event-shape distribution for e+e- annihilation into hadrons is computed in the framework of SCET including input from fixed-order perturbation theory. We calculate all missing ingredients for achieving N3LL resummation accuracy in the cross section, which is then matched onto O(alpha_s^3) fixed-order results. Hadronization power corrections are incorporated as a convolution with a nonperturbative shape function. Wide-angle soft radiation effects introduce an O(Lambda_QCD) renormalon ambiguity in the cross section, which we cure by switching to the Rgap short-distance scheme. We also include hadron mass effects, but find their effect is rather small. Performing fits to the tail of the C-parameter distribution for many center of mass energies we find that the strong coupling constant is alpha_s(mZ) = 0.1123 +-0.0015, with chi^2/dof=0.99. |
2108.09315 | Thomas Steingasser | Justin Khoury, Thomas Steingasser | Gauge hierarchy from electroweak vacuum metastability | v2: 24 pages, 6 figures. To appear in Physical Review D | null | 10.1103/PhysRevD.105.055031 | null | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the possibility that the gauge hierarchy is a byproduct of the
metastability of the electroweak vacuum, i.e., that whatever mechanism is
responsible for the latter also sets the running Higgs mass to a value smaller
than its natural value by many orders of magnitude. This perspective is
motivated by the early-time framework for eternal inflation put forth recently,
which favors vacua that are relatively short-lived, but applies more generally
to any theoretical approach predicting that our vacuum should be metastable. We
find that the metastability of the electroweak vacuum, together with the
requirement that such a non-trivial vacuum exists, requires the Higgs mass to
be smaller than the instability scale by around one order of magnitude. While
this bound is quite weak in the Standard Model (SM), as the instability scale
is $\sim 10^{11}$ GeV, simple and well-motivated extensions of the SM -
concretely, the $\nu$MSM with an approximate $B-\tilde{L}$ symmetry and the
minimal SU(4)/Sp(4) composite Higgs model - can significantly tighten the bound
by lowering the instability scale. We find that the bound can be brought down
to $\simeq 10$ TeV where our perturbative treatment of the decay rate becomes
unreliable. Our results imply that, assuming the SM symmetry breaking pattern,
small running Higgs masses are a universal property of theories giving rise to
metastability, suggesting a common origin of the two underlying fine-tunings
and providing a strong constraint on any attempt to explain metastability.
| [
{
"created": "Fri, 20 Aug 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Mar 2022 19:00:02 GMT",
"version": "v2"
}
] | 2022-04-13 | [
[
"Khoury",
"Justin",
""
],
[
"Steingasser",
"Thomas",
""
]
] | We consider the possibility that the gauge hierarchy is a byproduct of the metastability of the electroweak vacuum, i.e., that whatever mechanism is responsible for the latter also sets the running Higgs mass to a value smaller than its natural value by many orders of magnitude. This perspective is motivated by the early-time framework for eternal inflation put forth recently, which favors vacua that are relatively short-lived, but applies more generally to any theoretical approach predicting that our vacuum should be metastable. We find that the metastability of the electroweak vacuum, together with the requirement that such a non-trivial vacuum exists, requires the Higgs mass to be smaller than the instability scale by around one order of magnitude. While this bound is quite weak in the Standard Model (SM), as the instability scale is $\sim 10^{11}$ GeV, simple and well-motivated extensions of the SM - concretely, the $\nu$MSM with an approximate $B-\tilde{L}$ symmetry and the minimal SU(4)/Sp(4) composite Higgs model - can significantly tighten the bound by lowering the instability scale. We find that the bound can be brought down to $\simeq 10$ TeV where our perturbative treatment of the decay rate becomes unreliable. Our results imply that, assuming the SM symmetry breaking pattern, small running Higgs masses are a universal property of theories giving rise to metastability, suggesting a common origin of the two underlying fine-tunings and providing a strong constraint on any attempt to explain metastability. |
1906.00666 | Tanmay Kumar Poddar | Tanmay Kumar Poddar, Subhendra Mohanty, Soumya Jana | Constraints on ultra-light axions from compact binary systems | 19 pages, 5 figures, 2 tables. Accepted in Phys. Rev. D | Phys. Rev. D 101, 083007 (2020) | 10.1103/PhysRevD.101.083007 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra light particles $(m_a \sim 10^{-21}eV-10^{-22}eV)$ with axion-like
couplings to other particles can be candidates for fuzzy dark matter (FDM) if
the axion decay constant $f_a\sim 10^{17}GeV$. If a compact star is immersed in
such a low mass axionic potential it develops a long range field outside the
star. This axionic field is radiated away when the star is in a binary orbit.
The orbital period of a compact binary decays mainly due to the gravitational
wave radiation, which was confirmed first in the Hulse-Taylor binary pulsar.
The orbital period can also decay by radiation of other light particles like
axions and axion like particles(ALPs). For axionic radiation to take place, the
orbital frequency of the periodic motion of the binary system should be greater
than the mass of the scalar particle which can be radiated. This implies that,
for most of the observed binaries, particles with mass $m_a< 10^{-19}eV$ can be
radiated, which includes FDM particles. In this paper, we consider four compact
binary systems: PSR J0348+0432, PSR J0737-3039, PSR J1738+0333, and PSR
B1913+16 (Hulse Taylor Binary) and show that the observations of the decay in
orbital period put the bound on axion decay constant, $f_a\lesssim
\mathcal{O}(10^{11}GeV)$. This implies that Fuzzy Dark Matter cannot couple to
gluons.
| [
{
"created": "Mon, 3 Jun 2019 09:43:00 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2019 14:39:20 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Mar 2020 14:27:35 GMT",
"version": "v3"
}
] | 2020-04-15 | [
[
"Poddar",
"Tanmay Kumar",
""
],
[
"Mohanty",
"Subhendra",
""
],
[
"Jana",
"Soumya",
""
]
] | Ultra light particles $(m_a \sim 10^{-21}eV-10^{-22}eV)$ with axion-like couplings to other particles can be candidates for fuzzy dark matter (FDM) if the axion decay constant $f_a\sim 10^{17}GeV$. If a compact star is immersed in such a low mass axionic potential it develops a long range field outside the star. This axionic field is radiated away when the star is in a binary orbit. The orbital period of a compact binary decays mainly due to the gravitational wave radiation, which was confirmed first in the Hulse-Taylor binary pulsar. The orbital period can also decay by radiation of other light particles like axions and axion like particles(ALPs). For axionic radiation to take place, the orbital frequency of the periodic motion of the binary system should be greater than the mass of the scalar particle which can be radiated. This implies that, for most of the observed binaries, particles with mass $m_a< 10^{-19}eV$ can be radiated, which includes FDM particles. In this paper, we consider four compact binary systems: PSR J0348+0432, PSR J0737-3039, PSR J1738+0333, and PSR B1913+16 (Hulse Taylor Binary) and show that the observations of the decay in orbital period put the bound on axion decay constant, $f_a\lesssim \mathcal{O}(10^{11}GeV)$. This implies that Fuzzy Dark Matter cannot couple to gluons. |
hep-ph/0010093 | Alex H. Blin | Alex H. Blin (Universidade de Coimbra, Portugal) | Fluctuations of the Metric Tensor and Fermion Propagators | 10 pages, LaTeX, new version with minor revisions | null | null | null | hep-ph gr-qc | null | Conformal fluctuations of the metric tensor at the Planck scale are
considered. They give rise to a lower bound of the proper length. This leads to
finite expressions for quantities related to propagators without the need of
renormalization or regularization. Quantities like the current quark mass or
the effective strong coupling constant have to be reinterpreted.
| [
{
"created": "Tue, 10 Oct 2000 15:41:10 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2001 16:15:56 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Blin",
"Alex H.",
"",
"Universidade de Coimbra, Portugal"
]
] | Conformal fluctuations of the metric tensor at the Planck scale are considered. They give rise to a lower bound of the proper length. This leads to finite expressions for quantities related to propagators without the need of renormalization or regularization. Quantities like the current quark mass or the effective strong coupling constant have to be reinterpreted. |
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