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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1802.06703 | Miguel Sanchis | Miguel-Angel Sanchis-Lozano, Edward K. Sarkisyan-Grinbaum | Searching for new physics with three-particle correlations in $pp$
collisions at the LHC | 6 pages, 4 figures | null | 10.1016/j.physletb.2018.04.033 | CERN-TH-2018-034 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New phenomena involving pseudorapidity and azimuthal correlations among final
state particles in $pp$ collisions at the LHC can hint at the existence of
hidden sectors beyond the Standard Model. In this paper we rely on a
correlated-cluster picture of multiparticle production, which was shown to
account for the ridge effect, to assess the effect of a hidden sector on
three-particle correlations concluding that there is a potential signature of
new physics that can be directly tested by experiments using well-known
techniques.
| [
{
"created": "Mon, 19 Feb 2018 17:02:27 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Apr 2018 09:55:19 GMT",
"version": "v2"
}
] | 2018-04-25 | [
[
"Sanchis-Lozano",
"Miguel-Angel",
""
],
[
"Sarkisyan-Grinbaum",
"Edward K.",
""
]
] | New phenomena involving pseudorapidity and azimuthal correlations among final state particles in $pp$ collisions at the LHC can hint at the existence of hidden sectors beyond the Standard Model. In this paper we rely on a correlated-cluster picture of multiparticle production, which was shown to account for the ridge effect, to assess the effect of a hidden sector on three-particle correlations concluding that there is a potential signature of new physics that can be directly tested by experiments using well-known techniques. |
1509.08477 | James Unwin | Lisa Randall, Jakub Scholtz, and James Unwin | Flooded Dark Matter and S Level Rise | 25 pages, 5 figures | null | 10.1007/JHEP03(2016)011 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most dark matter (DM) models set the DM relic density by some interaction
with Standard Model particles. Such models generally assume the existence of
Standard Model particles early on, with the DM relic density a later
consequence of those interactions. Perhaps a more compelling assumption is that
DM is not part of the Standard Model sector and a population of DM too is
generated at the end of inflation. This democratic assumption does not
necessarily provide a natural value for the DM relic density, and superficially
leads to too much entropy in the dark sector. We address the latter issue by
the late decay of heavy particles produced at early times, associating the DM
relic density with the lifetime of a long-lived state. We ask what it would
take for this scenario to be compatible with observations in what we call
Flooded Dark Matter (FDM) and discuss several interesting consequences. One is
that DM can be very light and furthermore, light DM is in some sense the most
natural scenario in FDM as it is compatible with larger couplings of the
decaying particle. Moreover, the decay of the field with the smallest coupling
and hence the longest lifetime dominates the entropy and possibly the matter
content of the Universe, a principle we refer to as 'Maximum Baroqueness'. We
also show that the dark sector should be colder than the ordinary sector,
relaxing the free-streaming constraints on light DM. We will discuss the
implications for the core-cusp problem in a follow-up paper. FDM also has
interesting baryogenesis implications. One possibility is that both DM and
baryon asymmetries are simultaneously diluted by a late entropy dump.
Alternatively, FDM is compatible with an elegant non-thermal leptogenesis
implementation in which decays of a heavy RH neutrino lead to late time
reheating of the Standard Model and provide suitable conditions for creation of
a lepton asymmetry.
| [
{
"created": "Mon, 28 Sep 2015 20:13:33 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2016 02:28:33 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Randall",
"Lisa",
""
],
[
"Scholtz",
"Jakub",
""
],
[
"Unwin",
"James",
""
]
] | Most dark matter (DM) models set the DM relic density by some interaction with Standard Model particles. Such models generally assume the existence of Standard Model particles early on, with the DM relic density a later consequence of those interactions. Perhaps a more compelling assumption is that DM is not part of the Standard Model sector and a population of DM too is generated at the end of inflation. This democratic assumption does not necessarily provide a natural value for the DM relic density, and superficially leads to too much entropy in the dark sector. We address the latter issue by the late decay of heavy particles produced at early times, associating the DM relic density with the lifetime of a long-lived state. We ask what it would take for this scenario to be compatible with observations in what we call Flooded Dark Matter (FDM) and discuss several interesting consequences. One is that DM can be very light and furthermore, light DM is in some sense the most natural scenario in FDM as it is compatible with larger couplings of the decaying particle. Moreover, the decay of the field with the smallest coupling and hence the longest lifetime dominates the entropy and possibly the matter content of the Universe, a principle we refer to as 'Maximum Baroqueness'. We also show that the dark sector should be colder than the ordinary sector, relaxing the free-streaming constraints on light DM. We will discuss the implications for the core-cusp problem in a follow-up paper. FDM also has interesting baryogenesis implications. One possibility is that both DM and baryon asymmetries are simultaneously diluted by a late entropy dump. Alternatively, FDM is compatible with an elegant non-thermal leptogenesis implementation in which decays of a heavy RH neutrino lead to late time reheating of the Standard Model and provide suitable conditions for creation of a lepton asymmetry. |
0906.1288 | Alexei Nefediev | A.V. Nefediev (ITEP, Moscow), J.E.F.T. Ribeiro (IST, Lisbon) | Real-time approach to quark confined systems at finite temperatures | LaTeX2e, 6 pages, uses jetpl.cls (included), version to appear in
JETP Lett | JETP Lett. 90 (2009) 417-422; Pisma Zh.Eksp.Teor.Fiz. 90 (2009)
461-466 | 10.1134/S0021364009180039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalised Nambu-Jona-Lasinio model for QCD is considered at finite
temperatures in the framework of a real-time formalism. The proposed approach
allows one to study various properties of the model at T>0, such as chiral
symmetry breaking and restoration, properties of the bound-state spectrum, and
so on.
| [
{
"created": "Sat, 6 Jun 2009 15:29:10 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 2009 13:14:46 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
],
[
"Ribeiro",
"J. E. F. T.",
"",
"IST, Lisbon"
]
] | Generalised Nambu-Jona-Lasinio model for QCD is considered at finite temperatures in the framework of a real-time formalism. The proposed approach allows one to study various properties of the model at T>0, such as chiral symmetry breaking and restoration, properties of the bound-state spectrum, and so on. |
1010.1001 | Filipe Joaquim | Andrea Brignole, Filipe R. Joaquim and Anna Rossi | A common source for neutrino and sparticle masses | 6 pages, 2 figures. Based on talks presented at "PASCOS 2010, the
16th International Symposium on Particles, Strings and Cosmology" (Valencia,
Spain) and "SUSY 2010, the 18th International Conference on Supersymmetry and
Unification of Fundamental Interactions" (Bonn, Germany). To appear in the
proceedings of PASCOS 2010 | J.Phys.Conf.Ser.259:012068,2010 | 10.1088/1742-6596/259/1/012068 | CERN-PH-TH/2010-222 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss supersymmetric scenarios in which neutrino masses arise from
effective d=6 operators in the Kahler potential (including SUSY-breaking
insertions). Simple explicit realizations of those Kahler operators are
presented in the context of the type II seesaw. An appealing scenario emerges
upon identifying the seesaw mediators with SUSY-breaking messengers.
| [
{
"created": "Tue, 5 Oct 2010 20:00:04 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Brignole",
"Andrea",
""
],
[
"Joaquim",
"Filipe R.",
""
],
[
"Rossi",
"Anna",
""
]
] | We discuss supersymmetric scenarios in which neutrino masses arise from effective d=6 operators in the Kahler potential (including SUSY-breaking insertions). Simple explicit realizations of those Kahler operators are presented in the context of the type II seesaw. An appealing scenario emerges upon identifying the seesaw mediators with SUSY-breaking messengers. |
hep-ph/0010290 | Antal Jakovac | A. Jakovac | Resummation and damping in the O(N) model | Talk given at SEWM2000. 5 pages | null | 10.1142/9789812799913_0019 | null | hep-ph | null | In this talk I summarize the one loop and higher loop calculations of the
effective equations of motion of the O(N) symmetric scalar model in the linear
response approximation. At one loop one finds essential difference in long time
behavior for the fields below and above a dynamically generated length scale. A
partial resummation assuming quasi-particle propagation seems to cancel the
relevance of this scale.
| [
{
"created": "Wed, 25 Oct 2000 13:55:58 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Jakovac",
"A.",
""
]
] | In this talk I summarize the one loop and higher loop calculations of the effective equations of motion of the O(N) symmetric scalar model in the linear response approximation. At one loop one finds essential difference in long time behavior for the fields below and above a dynamically generated length scale. A partial resummation assuming quasi-particle propagation seems to cancel the relevance of this scale. |
1912.03881 | Ulf-G. Mei{\ss}ner | Hans-Werner Hammer, Ulf-G. Mei{\ss}ner | The proton radius: From a puzzle to precision | 3 pp, solicited article for News&Views, Science Bulletin, accepted
for publication, abstract only for the arXiv version | Science Bulletin 65 (2020) pp. 257-258 | 10.1016/j.scib.2019.12.012 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We comment on the status and history of the proton charge radius
determinations.
| [
{
"created": "Mon, 9 Dec 2019 07:30:22 GMT",
"version": "v1"
}
] | 2020-01-22 | [
[
"Hammer",
"Hans-Werner",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We comment on the status and history of the proton charge radius determinations. |
1606.08348 | John R. Hiller | J.R. Hiller | Nonperturbative light-front Hamiltonian methods | 67 pages, 14 figures; review to appear in Progress in Particle and
Nuclear Physics | null | 10.1016/j.ppnp.2016.06.002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the current state-of-the-art in nonperturbative calculations done
with Hamiltonians constructed in light-front quantization of various field
theories. The language of light-front quantization is introduced, and important
(numerical) techniques, such as Pauli--Villars regularization, discrete
light-cone quantization, basis light-front quantization, the light-front
coupled-cluster method, the renormalization group procedure for effective
particles, sector-dependent renormalization, and the Lanczos diagonalization
method, are surveyed. Specific applications are discussed for quenched scalar
Yukawa theory, $\phi^4$ theory, ordinary Yukawa theory, supersymmetric
Yang--Mills theory, quantum electrodynamics, and quantum chromodynamics. The
content should serve as an introduction to these methods for anyone interested
in doing such calculations and as a rallying point for those who wish to solve
quantum chromodynamics in terms of wave functions rather than random samplings
of Euclidean field configurations.
| [
{
"created": "Mon, 27 Jun 2016 16:20:10 GMT",
"version": "v1"
}
] | 2016-06-28 | [
[
"Hiller",
"J. R.",
""
]
] | We examine the current state-of-the-art in nonperturbative calculations done with Hamiltonians constructed in light-front quantization of various field theories. The language of light-front quantization is introduced, and important (numerical) techniques, such as Pauli--Villars regularization, discrete light-cone quantization, basis light-front quantization, the light-front coupled-cluster method, the renormalization group procedure for effective particles, sector-dependent renormalization, and the Lanczos diagonalization method, are surveyed. Specific applications are discussed for quenched scalar Yukawa theory, $\phi^4$ theory, ordinary Yukawa theory, supersymmetric Yang--Mills theory, quantum electrodynamics, and quantum chromodynamics. The content should serve as an introduction to these methods for anyone interested in doing such calculations and as a rallying point for those who wish to solve quantum chromodynamics in terms of wave functions rather than random samplings of Euclidean field configurations. |
hep-ph/9410292 | Chyla Jiri | J.Ch\'yla and J. Rame\v{s} | What does the CCFR measurement of the Gross--Llewelyn Smith sum rule
tell us? | PRA-HEP/94-09, Latex, 9 pages and 5 uuencoded figures. Raw PS files
replaced with uuencoded ones | Phys.Lett. B343 (1995) 351-357 | 10.1016/0370-2693(94)01469-S | null | hep-ph | null | Recently the CCFR Collaboration reported the measurement of the
Gross--Llewellyn Smith sum rule %at $Q^2=3\; \mr{GeV}^2$:
$\int^{1}_{0}\mr{d}F_{3}^{\nu p+\bare{\nu}p}(x,Q^2=3\;\mr{GeV}^2)= 2.50\pm
0.018(\mr{stat})$. Subsequently Kataev and Sidorov analyzed the
$Q^2$--dependence of this sum rule and pointed out a discrepancy between the
results obtained via integration of the NLO fits to $xF_{3}(x,Q^2)$ and the
purely perturbative prediction. We suggest an explanation of this disagreement
and show that the result of the CCFR measurement of the GLS sum rule integral
can be determined from the knowledge of the value of $\Lambda_{\bbare{MS}}$
only.
| [
{
"created": "Fri, 14 Oct 1994 17:50:22 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 1994 21:32:05 GMT",
"version": "v2"
}
] | 2016-08-14 | [
[
"Chýla",
"J.",
""
],
[
"Rameš",
"J.",
""
]
] | Recently the CCFR Collaboration reported the measurement of the Gross--Llewellyn Smith sum rule %at $Q^2=3\; \mr{GeV}^2$: $\int^{1}_{0}\mr{d}F_{3}^{\nu p+\bare{\nu}p}(x,Q^2=3\;\mr{GeV}^2)= 2.50\pm 0.018(\mr{stat})$. Subsequently Kataev and Sidorov analyzed the $Q^2$--dependence of this sum rule and pointed out a discrepancy between the results obtained via integration of the NLO fits to $xF_{3}(x,Q^2)$ and the purely perturbative prediction. We suggest an explanation of this disagreement and show that the result of the CCFR measurement of the GLS sum rule integral can be determined from the knowledge of the value of $\Lambda_{\bbare{MS}}$ only. |
hep-ph/9811392 | Zhou Bang Rong | Bang-Rong Zhou | Fermion Self-Energy and Chiral Symmetry Breaking from Four-Fermion and
Gauge Interactions | 9 pages, Latex, 1 figure, the figure put in body of the paper by epsf | Commun.Theor.Phys.30:583-588,1998 | 10.1088/0253-6102/30/4/583 | null | hep-ph | null | The exact analytic solutions of the linearized Schwinger-Dyson equation of
fermion self-energy are used to obtain the effective four-fermion and gauge
coupling criticality curves for dynamical chiral symmetry breaking. The results
show that when the zero-momentum gauge coupling $\alpha(0) < \alpha_0(0)$, the
critical gauge coupling in the pure gauge interaction case, the minimal
critical four-fermion coupling $\beta_{\rm min}$ is always non-zero and
positive and will go up as the $\alpha(0)$ decreases. The use of the exact
solutions also allow us to make quite definite estimations of the momentum
scales where chiral symmetry breaking would happen if the values of an infrared
parameter $\xi$ are given separately.
| [
{
"created": "Thu, 19 Nov 1998 07:55:10 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 1998 07:46:55 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Zhou",
"Bang-Rong",
""
]
] | The exact analytic solutions of the linearized Schwinger-Dyson equation of fermion self-energy are used to obtain the effective four-fermion and gauge coupling criticality curves for dynamical chiral symmetry breaking. The results show that when the zero-momentum gauge coupling $\alpha(0) < \alpha_0(0)$, the critical gauge coupling in the pure gauge interaction case, the minimal critical four-fermion coupling $\beta_{\rm min}$ is always non-zero and positive and will go up as the $\alpha(0)$ decreases. The use of the exact solutions also allow us to make quite definite estimations of the momentum scales where chiral symmetry breaking would happen if the values of an infrared parameter $\xi$ are given separately. |
hep-ph/9912492 | Steve King | S. F. King | Large Mixing Angle MSW and Atmospheric Neutrinos from Single
Right-Handed Neutrino Dominance and U(1) Family Symmetry | 30 pages, Latex. Unchanged. To appear in Nuclear Physics B | Nucl.Phys. B576 (2000) 85-105 | 10.1016/S0550-3213(00)00109-7 | null | hep-ph | null | Single right-handed neutrino dominance (SRHND) in the 23 sector of the light
effective neutrino mass matrix has been proposed as a natural explanation for
the concurrent large 23 mixing angle and large 23 mass hierarchy. In this paper
we show how large 12 mixing angles, suitable for the large mixing angle (LMA)
MSW solution to the solar neutrino problem, may arise from SRHND. In order to
understand the conditions for SRHND and LMA MSW we first consider the case of
one and two right-handed neutrinos, and obtain simple analytic conditions which
are then extended to the case of three right-handed neutrinos. We then
introduce a single U(1) family symmetry and show how these analytic conditions
may be translated into U(1) charge assignments and perform a systematic search
for the simplest examples.
| [
{
"created": "Thu, 23 Dec 1999 17:21:30 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2000 10:39:28 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"King",
"S. F.",
""
]
] | Single right-handed neutrino dominance (SRHND) in the 23 sector of the light effective neutrino mass matrix has been proposed as a natural explanation for the concurrent large 23 mixing angle and large 23 mass hierarchy. In this paper we show how large 12 mixing angles, suitable for the large mixing angle (LMA) MSW solution to the solar neutrino problem, may arise from SRHND. In order to understand the conditions for SRHND and LMA MSW we first consider the case of one and two right-handed neutrinos, and obtain simple analytic conditions which are then extended to the case of three right-handed neutrinos. We then introduce a single U(1) family symmetry and show how these analytic conditions may be translated into U(1) charge assignments and perform a systematic search for the simplest examples. |
0812.0843 | John Terning | Haiying Cai, Hsin-Chia Cheng, and John Terning | A Quirky Little Higgs Model | 20 pages, 1 figure | JHEP 0905:045,2009 | 10.1088/1126-6708/2009/05/045 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extra dimensional model where the quadratically divergent top
loop contribution to the Higgs mass is cancelled by an uncolored heavy "top
quirk" charged under a different SU(3) gauge group. The cancellation is
enforced by bulk gauge symmetries. Thus we have an unusual type of little Higgs
model which has some quirky signatures. The top partner in this model could be
identified at the Large Hadron Collider due to macroscopic strings that connect
quirk and anti-quirks. The model can undergo radiative electroweak symmetry
breaking and is consistent with precision electroweak measurements.
| [
{
"created": "Thu, 4 Dec 2008 01:28:52 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2009 22:27:16 GMT",
"version": "v2"
}
] | 2010-01-08 | [
[
"Cai",
"Haiying",
""
],
[
"Cheng",
"Hsin-Chia",
""
],
[
"Terning",
"John",
""
]
] | We consider an extra dimensional model where the quadratically divergent top loop contribution to the Higgs mass is cancelled by an uncolored heavy "top quirk" charged under a different SU(3) gauge group. The cancellation is enforced by bulk gauge symmetries. Thus we have an unusual type of little Higgs model which has some quirky signatures. The top partner in this model could be identified at the Large Hadron Collider due to macroscopic strings that connect quirk and anti-quirks. The model can undergo radiative electroweak symmetry breaking and is consistent with precision electroweak measurements. |
1609.07708 | Martin Spinrath | Martin Spinrath | Neutrino Mass Sum Rules | 3 pages; proceedings of Neutrino 2016, XXVII International Conference
on Neutrino Physics and Astrophysics, 4-9 July 2016, London, UK | null | 10.1088/1742-6596/888/1/012176 | TTP16-039 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino mass sum rules are an important class of predictions in flavour
models relating the Majorana phases to the neutrino masses. This leads, for
instance, to enormous restrictions on the effective mass as probed in
experiments on neutrinoless double beta decay. While up to now these sum rules
have in practically all cases been taken to hold exactly, we will go here
beyond that. While the effect of the renormalisation group running can be
visible, the qualitative features do not change. This changes somewhat for
model dependent corrections which might alter even the qualitative predictions
but only for large corrections and a high neutrino mass scale close to the edge
of the current limits. This finding backs up the solidity of the predictions
derived in the literature apart from some exceptions, and it thus marks a very
important step in deriving testable and robust predictions from neutrino
flavour models.
| [
{
"created": "Sun, 25 Sep 2016 06:58:58 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Spinrath",
"Martin",
""
]
] | Neutrino mass sum rules are an important class of predictions in flavour models relating the Majorana phases to the neutrino masses. This leads, for instance, to enormous restrictions on the effective mass as probed in experiments on neutrinoless double beta decay. While up to now these sum rules have in practically all cases been taken to hold exactly, we will go here beyond that. While the effect of the renormalisation group running can be visible, the qualitative features do not change. This changes somewhat for model dependent corrections which might alter even the qualitative predictions but only for large corrections and a high neutrino mass scale close to the edge of the current limits. This finding backs up the solidity of the predictions derived in the literature apart from some exceptions, and it thus marks a very important step in deriving testable and robust predictions from neutrino flavour models. |
hep-ph/9804402 | Elisabetta Sassaroli | E. Sassaroli | An Explicit Model of Quark Mass Matrix | 7 pages | null | null | MIT-CTP-2735 | hep-ph | null | A physical model which describes the CKM matrix is analyzed. The elements of
such a matrix are field-strength renormalization factors. Each column gives the
probability amplitude for the field operators of the coupled Lagrangian to
create a one-particle eigenfunction of definite energy. The total conserved
charge is the sum of the flavor charges which are not conserved separately.
| [
{
"created": "Sat, 25 Apr 1998 23:36:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sassaroli",
"E.",
""
]
] | A physical model which describes the CKM matrix is analyzed. The elements of such a matrix are field-strength renormalization factors. Each column gives the probability amplitude for the field operators of the coupled Lagrangian to create a one-particle eigenfunction of definite energy. The total conserved charge is the sum of the flavor charges which are not conserved separately. |
hep-ph/9710520 | null | N.V.Krasnikov | Supersymmetric SU(5) model with large supersymmetry breaking scale | 13 pages, latex, no figures | null | null | Preprint INR 869R/97 | hep-ph | null | Taking into account uncertainties related with the initial coupling constants
and threshold corrections at low and high scales we find that in standard
supersymmetric SU(5) model the supersymmetry breaking scale could be up to
$10^8$ GeV. In the extensions of the standard supersymmetric SU(5) model the
supersymmetry breaking scale could be up to $O(10^{12})$ GeV.
In standard SU(5) supersymmetric model it is possible to increase the GUT
scale up to $5 \cdot 10^{17}$ GeV provided that the masses of chiral
superoctets and supertriplets are $m_{3,8} \sim O(10^{13})$ GeV. For SU(5)
supersymmetric model with $10^6$ GeV $\leq M_{SUSY} \leq 10^8$ GeV the Higgs
boson mass is predicted to be 120 GeV $\leq m_h \leq $ 150 GeV.
| [
{
"created": "Wed, 29 Oct 1997 12:47:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krasnikov",
"N. V.",
""
]
] | Taking into account uncertainties related with the initial coupling constants and threshold corrections at low and high scales we find that in standard supersymmetric SU(5) model the supersymmetry breaking scale could be up to $10^8$ GeV. In the extensions of the standard supersymmetric SU(5) model the supersymmetry breaking scale could be up to $O(10^{12})$ GeV. In standard SU(5) supersymmetric model it is possible to increase the GUT scale up to $5 \cdot 10^{17}$ GeV provided that the masses of chiral superoctets and supertriplets are $m_{3,8} \sim O(10^{13})$ GeV. For SU(5) supersymmetric model with $10^6$ GeV $\leq M_{SUSY} \leq 10^8$ GeV the Higgs boson mass is predicted to be 120 GeV $\leq m_h \leq $ 150 GeV. |
1611.04441 | Lingyun Dai | Ling-Yun Dai and Michael R. Pennington | Pion Polarizabilities from $\gamma\gamma\to\pi\pi$ Analysis | 18 pages, 4 figures, a few typos corrected | Phys. Rev. D 94, 116021 (2016) | 10.1103/PhysRevD.94.116021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for pion polarizabilities predicted using dispersion
relations from our earlier Amplitude Analysis of world data on two photon
production of meson pairs. The helicity-zero polarizabilities are rather stable
and insensitive to uncertainties in cross-channel exchanges. The need is first
to confirm the recent result on $(\alpha_1-\beta_1)$ for the charged pion by
COMPASS at CERN to an accuracy of 10\% by measuring the
$\gamma\gamma\to\pi^+\pi^-$ cross-section to an uncertainty of ~1\%. Then the
same polarizability, but for the $\pi^0$, is fixed to be
$(\alpha_1-\beta_1)_{\pi^0}=(-0.9\pm0.2)\times 10^{-4}$ fm$^{3}$. By analyzing
the correlation between uncertainties in the meson polarizability and those in
$\gamma\gamma$ cross-sections, we suggest experiments need to measure these
cross-sections between $\sqrt{s}\simeq 350$ and 600 MeV. The $\pi^0\pi^0$
cross-section then makes the $(\alpha_2-\beta_2)_{\pi^0}$ the easiest
helicity-two polarizability to determine.
| [
{
"created": "Mon, 14 Nov 2016 16:21:22 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2016 19:01:44 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Sep 2018 03:31:28 GMT",
"version": "v3"
}
] | 2018-09-11 | [
[
"Dai",
"Ling-Yun",
""
],
[
"Pennington",
"Michael R.",
""
]
] | We present results for pion polarizabilities predicted using dispersion relations from our earlier Amplitude Analysis of world data on two photon production of meson pairs. The helicity-zero polarizabilities are rather stable and insensitive to uncertainties in cross-channel exchanges. The need is first to confirm the recent result on $(\alpha_1-\beta_1)$ for the charged pion by COMPASS at CERN to an accuracy of 10\% by measuring the $\gamma\gamma\to\pi^+\pi^-$ cross-section to an uncertainty of ~1\%. Then the same polarizability, but for the $\pi^0$, is fixed to be $(\alpha_1-\beta_1)_{\pi^0}=(-0.9\pm0.2)\times 10^{-4}$ fm$^{3}$. By analyzing the correlation between uncertainties in the meson polarizability and those in $\gamma\gamma$ cross-sections, we suggest experiments need to measure these cross-sections between $\sqrt{s}\simeq 350$ and 600 MeV. The $\pi^0\pi^0$ cross-section then makes the $(\alpha_2-\beta_2)_{\pi^0}$ the easiest helicity-two polarizability to determine. |
hep-ph/9511439 | Elizabeth H. Simmons | E.H. Simmons, R.S. Chivukula, J. Terning | Direct Tests of Dynamical Electroweak Symmetry Breaking | Talk given by E.H.S at the International Symposium on Heavy Flavor
and Electroweak Theory in Beijing, 17-19 August, 1995 and the Yukawa
International Seminar `95 in Kyoto, 21-26 August, 1995. Latex (uses epsf). 10
pages. 2 figures. Full postscript version available at
http://smyrd.bu.edu/htfigs/htfigs.html | null | null | BU-HEP-95-3x | hep-ph | null | We review the connection between $m_t$ and the $Zb\bar b$ vertex in ETC
models and discuss the resulting experimental constraint on models with
weak-singlet ETC bosons. We mention several recent efforts to bring ETC models
into agreement with this constraint, and explore the most promising one
(non-commuting ETC) in detail.
| [
{
"created": "Tue, 28 Nov 1995 17:54:39 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Simmons",
"E. H.",
""
],
[
"Chivukula",
"R. S.",
""
],
[
"Terning",
"J.",
""
]
] | We review the connection between $m_t$ and the $Zb\bar b$ vertex in ETC models and discuss the resulting experimental constraint on models with weak-singlet ETC bosons. We mention several recent efforts to bring ETC models into agreement with this constraint, and explore the most promising one (non-commuting ETC) in detail. |
1112.4368 | Norma Susana Mankoc Borstnik | A. Hernandez-Galeana, N. S. Mankoc Borstnik | Masses and Mixing Matrices of Families of Quarks and Leptons Within the
Spin-Charge-Family theory, predictions beyond the tree level | 44 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The {\it theory unifying spin and charges and predicting families}, proposed
by N.S.M.B., predicts at the low energy regime two (in the mixing matrix
elements decoupled) groups of four families. There are two kinds of
contributions to mass matrices in this theory. One kind distinguishes on the
tree level only among the members of one family, that is among the $u$-quark,
$d$-quark, neutrino and electron, the left and right handed, while the other
kind distinguishes only among the families. Mass matrices for $d$-quarks and
electrons are on the tree level correspondingly strongly correlated and so are
mass matrices for $u$-quarks and neutrinos, up to the term, the Majorana term,
which is nonzero only for right handed neutrinos. Beyond the tree level both
kinds of contributions start to contribute coherently and it is expected that a
detailed study of properties of mass matrices beyond the tree level explains
drastic differences in masses and mixing matrices between quarks and leptons.
We report in this paper on analysis of one loop corrections to the tree level
fermion masses and mixing matrices. Loop diagrams are mediated by the gauge
bosons and the two kinds of scalar fields. A detailed numerical analysis of
fermion masses and mixing, including neutrinos, within this scenario is in
progress and preparation.
| [
{
"created": "Mon, 19 Dec 2011 15:30:06 GMT",
"version": "v1"
}
] | 2011-12-20 | [
[
"Hernandez-Galeana",
"A.",
""
],
[
"Borstnik",
"N. S. Mankoc",
""
]
] | The {\it theory unifying spin and charges and predicting families}, proposed by N.S.M.B., predicts at the low energy regime two (in the mixing matrix elements decoupled) groups of four families. There are two kinds of contributions to mass matrices in this theory. One kind distinguishes on the tree level only among the members of one family, that is among the $u$-quark, $d$-quark, neutrino and electron, the left and right handed, while the other kind distinguishes only among the families. Mass matrices for $d$-quarks and electrons are on the tree level correspondingly strongly correlated and so are mass matrices for $u$-quarks and neutrinos, up to the term, the Majorana term, which is nonzero only for right handed neutrinos. Beyond the tree level both kinds of contributions start to contribute coherently and it is expected that a detailed study of properties of mass matrices beyond the tree level explains drastic differences in masses and mixing matrices between quarks and leptons. We report in this paper on analysis of one loop corrections to the tree level fermion masses and mixing matrices. Loop diagrams are mediated by the gauge bosons and the two kinds of scalar fields. A detailed numerical analysis of fermion masses and mixing, including neutrinos, within this scenario is in progress and preparation. |
1503.06283 | Kalyan Dey | Kalyan Dey and B. Bhattacharjee | Strange behavior of rapidity dependent strangeness enhancement of
particles containing and not containing leading quarks | 19 pages and 9 figures | Nucl. Phys. A, 965, 2017 | 10.1016/j.nuclphysa.2017.05.092 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rapidity dependent strangeness enhancement factors for the identified
particles have been studied with the help of a string based hadronic transport
model UrQMD-3.3 (Ultra-relativistic Quantum Molecular Dynamics) at FAIR
energies. A strong rapidity dependent strangeness enhancement could be observed
with our generated data for $Au + Au$ collisions at the beam energy of
30\textit{A} GeV. The strangeness enhancement is found to be maximum at
mid-rapidity for the particles containing leading quarks while for particles
consisting of produced quarks only, the situation is seen to be otherwise. Such
rapidity dependent strangeness enhancement could be traced back to the
dependence of rapidity width on centrality or otherwise on the distribution of
net-baryon density.
| [
{
"created": "Sat, 21 Mar 2015 10:32:03 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2017 10:05:09 GMT",
"version": "v2"
}
] | 2017-06-05 | [
[
"Dey",
"Kalyan",
""
],
[
"Bhattacharjee",
"B.",
""
]
] | Rapidity dependent strangeness enhancement factors for the identified particles have been studied with the help of a string based hadronic transport model UrQMD-3.3 (Ultra-relativistic Quantum Molecular Dynamics) at FAIR energies. A strong rapidity dependent strangeness enhancement could be observed with our generated data for $Au + Au$ collisions at the beam energy of 30\textit{A} GeV. The strangeness enhancement is found to be maximum at mid-rapidity for the particles containing leading quarks while for particles consisting of produced quarks only, the situation is seen to be otherwise. Such rapidity dependent strangeness enhancement could be traced back to the dependence of rapidity width on centrality or otherwise on the distribution of net-baryon density. |
1512.01957 | Bo-Qiang Ma | Zhiyuan Wang, Bo-Qiang Ma | A unified approach to hadron phenomenology at zero and finite
temperatures in a hard-wall AdS/QCD model | 19 latex pages, 5 figures, final version for publication | null | 10.1140/epja/i2016-16122-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a unified approach to study meson, nucleon and $\Delta$-baryon
properties at zero and finite temperatures in the context of hard-wall AdS/QCD
model. We first combine some previous works dealing with mesons and baryons
separately, and introduce a new parameter~$\xi$ so that the model could give a
universal description of spectrum and couplings of both sectors in a
self-consistent way. All observables calculated numerically show reasonable
agreement with experimental data. We then study these observables at nonzero
temperature by modifying the AdS space-time into AdS-Schwartzchild space-time.
Numerically solving the model, we find an interesting temperature dependence of
the spectrum and the couplings. We also make a prediction on the finite
temperature decay width of some nucleon and $\Delta$ excited states.
| [
{
"created": "Mon, 7 Dec 2015 09:57:36 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2016 16:36:13 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Wang",
"Zhiyuan",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We propose a unified approach to study meson, nucleon and $\Delta$-baryon properties at zero and finite temperatures in the context of hard-wall AdS/QCD model. We first combine some previous works dealing with mesons and baryons separately, and introduce a new parameter~$\xi$ so that the model could give a universal description of spectrum and couplings of both sectors in a self-consistent way. All observables calculated numerically show reasonable agreement with experimental data. We then study these observables at nonzero temperature by modifying the AdS space-time into AdS-Schwartzchild space-time. Numerically solving the model, we find an interesting temperature dependence of the spectrum and the couplings. We also make a prediction on the finite temperature decay width of some nucleon and $\Delta$ excited states. |
2202.08840 | Marianne Moore | David McKeen, Marianne Moore, David E. Morrissey, Maxim Pospelov,
Harikrishnan Ramani | Accelerating Earth-Bound Dark Matter | 20 pages, 12 figures. v2: version accepted for publication | Phys. Rev. D 106, 035011 (2022) | 10.1103/PhysRevD.106.035011 | MIT-CTP/5405 | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | A fraction of the dark matter may consist of a particle species that
interacts much more strongly with the Standard Model than a typical weakly
interacting massive particle (WIMP) of similar mass. Such a strongly
interacting dark matter component could have avoided detection in searches for
WIMP-like dark matter through its interactions with the material in the
atmosphere and the Earth that slow it down significantly before reaching
detectors underground. These same interactions can also enhance the density of
a strongly interacting dark matter species near the Earth's surface to well
above the local galactic dark matter density. In this work we propose two new
methods of detecting strongly interacting dark matter based on accelerating the
enhanced population expected in the Earth through scattering. The first
approach is to use underground nuclear accelerator beams to upscatter the
ambient dark matter population into a WIMP-style detector located downstream.
In the second technique, dark matter is upscattered with an intense thermal
source and detected with a low-threshold dark matter detector. We also discuss
potential candidates for strongly interacting dark matter and we show that the
scenario can be naturally realized with a hidden fermion coupled to a sub-GeV
dark photon.
| [
{
"created": "Thu, 17 Feb 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 12:09:29 GMT",
"version": "v2"
}
] | 2022-08-12 | [
[
"McKeen",
"David",
""
],
[
"Moore",
"Marianne",
""
],
[
"Morrissey",
"David E.",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Ramani",
"Harikrishnan",
""
]
] | A fraction of the dark matter may consist of a particle species that interacts much more strongly with the Standard Model than a typical weakly interacting massive particle (WIMP) of similar mass. Such a strongly interacting dark matter component could have avoided detection in searches for WIMP-like dark matter through its interactions with the material in the atmosphere and the Earth that slow it down significantly before reaching detectors underground. These same interactions can also enhance the density of a strongly interacting dark matter species near the Earth's surface to well above the local galactic dark matter density. In this work we propose two new methods of detecting strongly interacting dark matter based on accelerating the enhanced population expected in the Earth through scattering. The first approach is to use underground nuclear accelerator beams to upscatter the ambient dark matter population into a WIMP-style detector located downstream. In the second technique, dark matter is upscattered with an intense thermal source and detected with a low-threshold dark matter detector. We also discuss potential candidates for strongly interacting dark matter and we show that the scenario can be naturally realized with a hidden fermion coupled to a sub-GeV dark photon. |
2406.00353 | Hui-Hui Duan | Hui-Hui Duan, Yong-Lu Liu, Qin Chang and Ming-Qiu Huang | Form factors of $\Lambda_b^0 \to \Lambda_c(2595)^+$ within light-cone
QCD sum rules | 15 pages, 3 figures and 6 tables | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we calculated the form factors of the weak decay process
$\Lambda_b^0 \to \Lambda_c(2595)^+$, where the final charm baryon represents an
excited state with spin-parity $\frac{1}{2}^-$. Utilizing the light-cone QCD
sum rules approach, we incorporated the contributions of the lowest two charm
baryon states: the ground state $\Lambda_c$ with $J^P=\frac{1}{2}^+$ and the
excited state $\Lambda_c(2595)^+$ with $J^P=\frac{1}{2}^-$ in the hadronic
representation of the $\Lambda_b$ to $\Lambda_c(2595)$ transition correlation
function. This approach allowes us to extract the form factors of the
$\Lambda_b^0 \to \Lambda_c(2595)^+$ from $\Lambda_b^0 \to \Lambda_c^+$
transition. During the light-cone QCD sum rules procedure, we employed the
light-cone distribution amplitudes (LCDAs) of the $\Lambda_b$ baryon.
Furthermore, by combining these form factors with the helicity amplitudes of
the bottom baryon transition matrix elements, we calculated the differential
decay widths for the processes $\Lambda_b^0 \to
\Lambda_c(2595)^+\ell^-\bar{\nu}_\ell$. Additionally, within the lifetime of
$\Lambda_b^0$, we obtained the absolute branching fractions for the
semileptonic decays $\Lambda_b^0 \to \Lambda_c(2595)^+ \ell^- \bar{\nu}_\ell$.
With the branching fractions of $\Lambda_b^0 \to \Lambda_c(2595)^+ \ell^-
\bar{\nu}_\ell$ calculated in this work, we also determined the parameter
$\mathcal{R}(\Lambda_c(2595)^+)$ which tests the lepton flavor universality.
This parameter is defined as the ratio of branching fractions
$\mathcal{B}r(\Lambda_b^0 \to \Lambda_c(2595)^+\tau^-\bar{\nu}_\tau)$ and
$\mathcal{B}r(\Lambda_b^0 \to \Lambda_c(2595)^+\mu^-\bar{\nu}_\mu)$. Our
results provide a valuable theoretical test for these decay channels and offer
insights into the LCDAs of bottom baryons, paving the way for further in-depth
investigations.
| [
{
"created": "Sat, 1 Jun 2024 08:14:33 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Duan",
"Hui-Hui",
""
],
[
"Liu",
"Yong-Lu",
""
],
[
"Chang",
"Qin",
""
],
[
"Huang",
"Ming-Qiu",
""
]
] | In this work, we calculated the form factors of the weak decay process $\Lambda_b^0 \to \Lambda_c(2595)^+$, where the final charm baryon represents an excited state with spin-parity $\frac{1}{2}^-$. Utilizing the light-cone QCD sum rules approach, we incorporated the contributions of the lowest two charm baryon states: the ground state $\Lambda_c$ with $J^P=\frac{1}{2}^+$ and the excited state $\Lambda_c(2595)^+$ with $J^P=\frac{1}{2}^-$ in the hadronic representation of the $\Lambda_b$ to $\Lambda_c(2595)$ transition correlation function. This approach allowes us to extract the form factors of the $\Lambda_b^0 \to \Lambda_c(2595)^+$ from $\Lambda_b^0 \to \Lambda_c^+$ transition. During the light-cone QCD sum rules procedure, we employed the light-cone distribution amplitudes (LCDAs) of the $\Lambda_b$ baryon. Furthermore, by combining these form factors with the helicity amplitudes of the bottom baryon transition matrix elements, we calculated the differential decay widths for the processes $\Lambda_b^0 \to \Lambda_c(2595)^+\ell^-\bar{\nu}_\ell$. Additionally, within the lifetime of $\Lambda_b^0$, we obtained the absolute branching fractions for the semileptonic decays $\Lambda_b^0 \to \Lambda_c(2595)^+ \ell^- \bar{\nu}_\ell$. With the branching fractions of $\Lambda_b^0 \to \Lambda_c(2595)^+ \ell^- \bar{\nu}_\ell$ calculated in this work, we also determined the parameter $\mathcal{R}(\Lambda_c(2595)^+)$ which tests the lepton flavor universality. This parameter is defined as the ratio of branching fractions $\mathcal{B}r(\Lambda_b^0 \to \Lambda_c(2595)^+\tau^-\bar{\nu}_\tau)$ and $\mathcal{B}r(\Lambda_b^0 \to \Lambda_c(2595)^+\mu^-\bar{\nu}_\mu)$. Our results provide a valuable theoretical test for these decay channels and offer insights into the LCDAs of bottom baryons, paving the way for further in-depth investigations. |
hep-ph/9712359 | null | Z. Chacko and R. N. Mohapatra | Supersymmetric Left-Right Model and Light Doubly Charged Higgs Bosons
and Higgsinos | 9 pages; no figures | Phys.Rev. D58 (1998) 015003 | 10.1103/PhysRevD.58.015003 | null | hep-ph | null | We point out that in a large class of supersymmetric left-right models with
automatic R-parity conservation there are a pair of light doubly charged Higgs
bosons and Higgsinos. Requiring the mass of these particles to satisfy the LEP
Z-width bound implies that $W_R$ mass must be above $10^{9}$ GeV.
| [
{
"created": "Fri, 12 Dec 1997 20:53:35 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Chacko",
"Z.",
""
],
[
"Mohapatra",
"R. N.",
""
]
] | We point out that in a large class of supersymmetric left-right models with automatic R-parity conservation there are a pair of light doubly charged Higgs bosons and Higgsinos. Requiring the mass of these particles to satisfy the LEP Z-width bound implies that $W_R$ mass must be above $10^{9}$ GeV. |
2006.11624 | Shaikh Saad | Ilja Dor\v{s}ner, Svjetlana Fajfer, Shaikh Saad | $\mu \to e \gamma$ selecting scalar leptoquark solutions for the
$(g-2)_{e,\mu}$ puzzles | 23 pages, 1 figure, substantial changes implemented, conclusions
expanded | Phys. Rev. D 102, 075007 (2020) | 10.1103/PhysRevD.102.075007 | OSU-HEP-20-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate all potentially viable scenarios that can produce the chiral
enhancement required to simultaneously explain the $(g-2)_{e}$ and
$(g-2)_{\mu}$ data with either a single scalar leptoquark or a pair of scalar
leptoquarks. We provide classification of these scenarios in terms of their
ability to satisfy the existing limits on the branching ratio for the $\mu \to
e \gamma$ process. The simultaneous explanation of the $(g-2)_{e,\mu}$
discrepancies, coupled with the current experimental data, implies that the
$(g-2)_e$ loops are exclusively due to the charm quark propagation whereas the
$(g-2)_\mu$ loops are due to the top quark propagation. The scenarios where the
$(g-2)_e$ loops are due to the top (bottom) quark propagation are, at best,
approximately nine (three) orders of magnitude away from the experimental limit
on the $\mu \to e \gamma$ branching ratio. All in all, there are only three
particular scenarios that can pass the $\mu \to e \gamma$ test and
simultaneously create large enough impact on the $(g-2)_{e,\mu}$ discrepancies
when the new physics is based on the Standard Model fermion content. These are
the $S_1$, $R_2$, and $S_1 \& S_3$ scenarios, where the first two are already
known to be phenomenologically viable candidates with respect to all other
flavor and collider data constraints. We show that the third scenario, where
the right-chiral couplings to charged leptons are due to $S_1$, the left-chiral
couplings to charged leptons are due to $S_3$, and the two leptoquarks mix
through the Standard Model Higgs field, cannot address the $(g-2)_{e}$ and
$(g-2)_{\mu}$ discrepancies at the $1\sigma$ level due to an interplay between
$K_L^0 \to e^\pm \mu^\mp$, $Z \to e^+ e^-$, and $Z \to \mu^+ \mu^-$ data
despite the ability of that scenario to avoid the $\mu \to e \gamma$ limit.
| [
{
"created": "Sat, 20 Jun 2020 17:39:36 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2020 15:19:37 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Sep 2020 08:28:14 GMT",
"version": "v3"
}
] | 2020-10-14 | [
[
"Doršner",
"Ilja",
""
],
[
"Fajfer",
"Svjetlana",
""
],
[
"Saad",
"Shaikh",
""
]
] | We investigate all potentially viable scenarios that can produce the chiral enhancement required to simultaneously explain the $(g-2)_{e}$ and $(g-2)_{\mu}$ data with either a single scalar leptoquark or a pair of scalar leptoquarks. We provide classification of these scenarios in terms of their ability to satisfy the existing limits on the branching ratio for the $\mu \to e \gamma$ process. The simultaneous explanation of the $(g-2)_{e,\mu}$ discrepancies, coupled with the current experimental data, implies that the $(g-2)_e$ loops are exclusively due to the charm quark propagation whereas the $(g-2)_\mu$ loops are due to the top quark propagation. The scenarios where the $(g-2)_e$ loops are due to the top (bottom) quark propagation are, at best, approximately nine (three) orders of magnitude away from the experimental limit on the $\mu \to e \gamma$ branching ratio. All in all, there are only three particular scenarios that can pass the $\mu \to e \gamma$ test and simultaneously create large enough impact on the $(g-2)_{e,\mu}$ discrepancies when the new physics is based on the Standard Model fermion content. These are the $S_1$, $R_2$, and $S_1 \& S_3$ scenarios, where the first two are already known to be phenomenologically viable candidates with respect to all other flavor and collider data constraints. We show that the third scenario, where the right-chiral couplings to charged leptons are due to $S_1$, the left-chiral couplings to charged leptons are due to $S_3$, and the two leptoquarks mix through the Standard Model Higgs field, cannot address the $(g-2)_{e}$ and $(g-2)_{\mu}$ discrepancies at the $1\sigma$ level due to an interplay between $K_L^0 \to e^\pm \mu^\mp$, $Z \to e^+ e^-$, and $Z \to \mu^+ \mu^-$ data despite the ability of that scenario to avoid the $\mu \to e \gamma$ limit. |
1604.02458 | Peter Adshead | Peter Adshead, Yanou Cui, and Jessie Shelton | Chilly Dark Sectors and Asymmetric Reheating | 22 pages + 3 appendices, 14 figures; v2: references added, version to
appear in JHEP | JHEP 1606 (2016) 016 | 10.1007/JHEP06(2016)016 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a broad class of theories, the relic abundance of dark matter is
determined by interactions internal to a thermalized dark sector, with no
direct involvement of the Standard Model (SM). We point out that these theories
raise an immediate cosmological question: how was the dark sector initially
populated in the early universe? Motivated in part by the difficulty of
accommodating large amounts of entropy carried in dark radiation with cosmic
microwave background measurements of the effective number of relativistic
species at recombination, $N_{\mathrm{eff}}$, we aim to establish which
admissible cosmological histories can populate a thermal dark sector that never
reaches thermal equilibrium with the SM. The minimal cosmological origin for
such a dark sector is asymmetric reheating, when the same mechanism that
populates the SM in the early universe also populates the dark sector at a
lower temperature. Here we demonstrate that the resulting inevitable
inflaton-mediated scattering between the dark sector and the SM can wash out a
would-be temperature asymmetry, and establish the regions of parameter space
where temperature asymmetries can be generated in minimal reheating scenarios.
Thus obtaining a temperature asymmetry of a given size either restricts
possible inflaton masses and couplings or necessitates a non-minimal cosmology
for one or both sectors. As a side benefit, we develop techniques for
evaluating collision terms in the relativistic Boltzmann equation when the full
dependence on Bose-Einstein or Fermi-Dirac phase space distributions must be
retained, and present several new results on relativistic thermal averages in
an appendix.
| [
{
"created": "Fri, 8 Apr 2016 20:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2016 22:41:18 GMT",
"version": "v2"
}
] | 2016-06-14 | [
[
"Adshead",
"Peter",
""
],
[
"Cui",
"Yanou",
""
],
[
"Shelton",
"Jessie",
""
]
] | In a broad class of theories, the relic abundance of dark matter is determined by interactions internal to a thermalized dark sector, with no direct involvement of the Standard Model (SM). We point out that these theories raise an immediate cosmological question: how was the dark sector initially populated in the early universe? Motivated in part by the difficulty of accommodating large amounts of entropy carried in dark radiation with cosmic microwave background measurements of the effective number of relativistic species at recombination, $N_{\mathrm{eff}}$, we aim to establish which admissible cosmological histories can populate a thermal dark sector that never reaches thermal equilibrium with the SM. The minimal cosmological origin for such a dark sector is asymmetric reheating, when the same mechanism that populates the SM in the early universe also populates the dark sector at a lower temperature. Here we demonstrate that the resulting inevitable inflaton-mediated scattering between the dark sector and the SM can wash out a would-be temperature asymmetry, and establish the regions of parameter space where temperature asymmetries can be generated in minimal reheating scenarios. Thus obtaining a temperature asymmetry of a given size either restricts possible inflaton masses and couplings or necessitates a non-minimal cosmology for one or both sectors. As a side benefit, we develop techniques for evaluating collision terms in the relativistic Boltzmann equation when the full dependence on Bose-Einstein or Fermi-Dirac phase space distributions must be retained, and present several new results on relativistic thermal averages in an appendix. |
1608.01325 | Jorge Segovia | Pablo G. Ortega, Jorge Segovia, David R. Entem and Francisco
Fern\'andez | Canonical description of the new LHCb resonances | 7 pages, 8 tables, 2 figures | Phys. Rev. D 94, 114018 (2016) | 10.1103/PhysRevD.94.114018 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHCb Collaboration has recently observed four $J/\psi\phi$ structures
called $X(4140)$, $X(4274)$, $X(4500)$ and $X(4700)$ in the $B^{+}\to
J/\psi\phi K^{+}$ decays. We study them herein using a nonrelativistic
constituent quark model in which the degrees of freedom are quark-antiquark and
meson-meson components. The $X(4140)$ resonance appears as a cusp in the
$J/\psi\phi$ channel due to the near coincidence of the
$D_{s}^{\pm}D_{s}^{\ast\pm}$ and $J/\psi\phi$ mass thresholds. The remaining
three $X(4274)$, $X(4500)$ and $X(4700)$ appear as conventional charmonium
states with quantum numbers $3^{3}P_{1}$, $4^{3}P_{0}$ and $5^{3}P_{0}$,
respectively; and whose masses and widths are slightly modified due to their
coupling with the corresponding closest meson-meson thresholds. A particular
feature of our quark model is a lattice-based screened linear confining
interaction that has been constrained in the light quark sector and usually
produces higher excited heavy-quark states with lower masses than standard
quark model predictions.
| [
{
"created": "Wed, 3 Aug 2016 20:01:07 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2016 16:43:19 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Ortega",
"Pablo G.",
""
],
[
"Segovia",
"Jorge",
""
],
[
"Entem",
"David R.",
""
],
[
"Fernández",
"Francisco",
""
]
] | The LHCb Collaboration has recently observed four $J/\psi\phi$ structures called $X(4140)$, $X(4274)$, $X(4500)$ and $X(4700)$ in the $B^{+}\to J/\psi\phi K^{+}$ decays. We study them herein using a nonrelativistic constituent quark model in which the degrees of freedom are quark-antiquark and meson-meson components. The $X(4140)$ resonance appears as a cusp in the $J/\psi\phi$ channel due to the near coincidence of the $D_{s}^{\pm}D_{s}^{\ast\pm}$ and $J/\psi\phi$ mass thresholds. The remaining three $X(4274)$, $X(4500)$ and $X(4700)$ appear as conventional charmonium states with quantum numbers $3^{3}P_{1}$, $4^{3}P_{0}$ and $5^{3}P_{0}$, respectively; and whose masses and widths are slightly modified due to their coupling with the corresponding closest meson-meson thresholds. A particular feature of our quark model is a lattice-based screened linear confining interaction that has been constrained in the light quark sector and usually produces higher excited heavy-quark states with lower masses than standard quark model predictions. |
0906.0167 | Peter Orland | Jing Xiao | Renormalization of QCD under longitudinal rescaling | Ph.D. dissertation, CUNY graduate program, Latex, 60 pages | null | null | BCCUNY-HEP/09-05 | hep-ph cond-mat.stat-mech hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The form of the quantum Yang-Mills action, under a longitudinal rescaling is
determined using a Wilsonian renormalization group. The high-energy limit, is
the extreme limit of such a rescaling. We compute the anomalous dimensions and
discuss the validity of the high-energy limit. This thesis is an expanded
version of joint work with P. Orland, which appeared in arXiv:0901.2955.
| [
{
"created": "Sun, 31 May 2009 16:40:55 GMT",
"version": "v1"
}
] | 2009-06-02 | [
[
"Xiao",
"Jing",
""
]
] | The form of the quantum Yang-Mills action, under a longitudinal rescaling is determined using a Wilsonian renormalization group. The high-energy limit, is the extreme limit of such a rescaling. We compute the anomalous dimensions and discuss the validity of the high-energy limit. This thesis is an expanded version of joint work with P. Orland, which appeared in arXiv:0901.2955. |
2111.03400 | Daniel Schuh | Andreas Ipp, David I. M\"uller, Daniel Schuh | Transverse momentum broadening in real-time lattice simulations of the
glasma | 11 pages, 4 figures, submitted to LATTICE21 conference proceedings | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of jets in heavy-ion collisions provides important information
about the interaction of partons with the medium that they traverse. The seeds
of jets are highly energetic partons, which are produced from hard scatterings
during the collision event. As such, they are affected by all different stages
of the medium's time evolution, including the glasma, which is the
pre-equilibrium precursor state of the quark-gluon plasma. Here we report on
our numerical lattice simulations of partons traversing the boost-invariant,
non-perturbative glasma as created at the early stages of collisions at RHIC
and LHC. We find that partons quickly accumulate transverse momentum up to the
saturation momentum during the glasma stage. Furthermore, we observe an
interesting anisotropy in transverse momentum broadening of partons with larger
broadening in the rapidity than in the azimuthal direction. Its origin can be
related to correlations among the longitudinal color-electric and
color-magnetic flux tubes in the initial state of the glasma. We compare these
observations to the semi-analytic results obtained by a weak-field
approximation, where we also find such an anisotropy in a parton's transverse
momentum broadening.
| [
{
"created": "Fri, 5 Nov 2021 11:21:59 GMT",
"version": "v1"
}
] | 2021-11-08 | [
[
"Ipp",
"Andreas",
""
],
[
"Müller",
"David I.",
""
],
[
"Schuh",
"Daniel",
""
]
] | The study of jets in heavy-ion collisions provides important information about the interaction of partons with the medium that they traverse. The seeds of jets are highly energetic partons, which are produced from hard scatterings during the collision event. As such, they are affected by all different stages of the medium's time evolution, including the glasma, which is the pre-equilibrium precursor state of the quark-gluon plasma. Here we report on our numerical lattice simulations of partons traversing the boost-invariant, non-perturbative glasma as created at the early stages of collisions at RHIC and LHC. We find that partons quickly accumulate transverse momentum up to the saturation momentum during the glasma stage. Furthermore, we observe an interesting anisotropy in transverse momentum broadening of partons with larger broadening in the rapidity than in the azimuthal direction. Its origin can be related to correlations among the longitudinal color-electric and color-magnetic flux tubes in the initial state of the glasma. We compare these observations to the semi-analytic results obtained by a weak-field approximation, where we also find such an anisotropy in a parton's transverse momentum broadening. |
hep-ph/9504272 | Sean Fleming Northwestern University | Sean Fleming and Ivan Maksymyk | Can light Goldstone boson loops counter the `S-argument' against
Technicolor? | We have considerably shortened this paper. The bulk of the derivation
of the $STUVWX$ formalism has been removed and will be presented elsewhere.
More emphasis has been placed on the calculation of $STUVWX$ in a one-family
Technicolor model with light psuedo-goldstone bosons. Though the result
remains the same, the `S-argument' can not be countered, we have elucidated
some interesting points in the calculation. In particular we emphasize the
fact that it is not possible to tell from the outset what the calculated
value of $S$ at the $Z$-pole will be | Phys.Rev. D53 (1996) 2781-2788 | 10.1103/PhysRevD.53.2781 | null | hep-ph | null | We examine the oblique correction phenomenology of one-family Technicolor
with light pseudo-Goldstone bosons. From loop calculations based on a gauged
chiral lagrangian for Technicolor, we are lead to conclude that even though
loops with light Goldstone bosons give a negative contribution to $S$ measured
at the $Z$-pole, this effect is not sufficiently large to unambiguously counter
the `S-argument' against one-family Technicolor. This result cannot be guessed
\apriori, but must be explicitly calculated. Our analysis entails an extended
version of the $STU$ oblique parametrization of Peskin and Takeuchi. In
principle, this extended formalism ($STUVWX$) must be used when there are light
new particles in loops.
| [
{
"created": "Mon, 10 Apr 1995 19:31:42 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jun 1995 20:16:00 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Fleming",
"Sean",
""
],
[
"Maksymyk",
"Ivan",
""
]
] | We examine the oblique correction phenomenology of one-family Technicolor with light pseudo-Goldstone bosons. From loop calculations based on a gauged chiral lagrangian for Technicolor, we are lead to conclude that even though loops with light Goldstone bosons give a negative contribution to $S$ measured at the $Z$-pole, this effect is not sufficiently large to unambiguously counter the `S-argument' against one-family Technicolor. This result cannot be guessed \apriori, but must be explicitly calculated. Our analysis entails an extended version of the $STU$ oblique parametrization of Peskin and Takeuchi. In principle, this extended formalism ($STUVWX$) must be used when there are light new particles in loops. |
hep-ph/9305262 | Jan Louis | R. Barbieri, J. Louis, M. Moretti | Phenomenological Implications of Supersymmetry Breaking by the Dilaton | 14 pages, (4 figures not included, available upon request),
CERN-TH.6856/93 (In the previous version of this article the gaugino masses
were given incorrectly. As a consequences the quantitative analysis of the
low energy spectrum changes.) | Phys.Lett.B312:451-460,1993; ERRATUM-ibid.B316:632,1993 | 10.1016/0370-2693(93)90981-M | null | hep-ph hep-th | null | We investigate the low energy properties of string vacua with spontaneously
broken $N=1$ supersymmetry by a dilaton $F$-term. As a consequence of the
universal couplings of the dilaton, the supersymmetric mass spectrum is
determined in terms of only three independent parameters and more constrained
than in the minimal supersymmetric Standard Model. For a $\mu$-term induced by
the \K\ potential the parameter space becomes two-dimensional; in the allowed
regions of this parameter space we find that most supersymmetric particles are
determined solely by the gluino mass. The Higgs is rather light and the
top-quark mass always lower than 180 GeV.
| [
{
"created": "Thu, 13 May 1993 20:49:56 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 1993 17:46:43 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Barbieri",
"R.",
""
],
[
"Louis",
"J.",
""
],
[
"Moretti",
"M.",
""
]
] | We investigate the low energy properties of string vacua with spontaneously broken $N=1$ supersymmetry by a dilaton $F$-term. As a consequence of the universal couplings of the dilaton, the supersymmetric mass spectrum is determined in terms of only three independent parameters and more constrained than in the minimal supersymmetric Standard Model. For a $\mu$-term induced by the \K\ potential the parameter space becomes two-dimensional; in the allowed regions of this parameter space we find that most supersymmetric particles are determined solely by the gluino mass. The Higgs is rather light and the top-quark mass always lower than 180 GeV. |
0710.1632 | Itay Yavin | Paul Langacker, Gil Paz, Lian-Tao Wang, Itay Yavin | Z'-mediated Supersymmetry Breaking | Minor modifications to text to comply by PRL standards | Phys.Rev.Lett.100:041802,2008 | 10.1103/PhysRevLett.100.041802 | null | hep-ph hep-ex hep-th | null | We consider a class of models in which supersymmetry breaking is communicated
dominantly via a U'(1) gauge interaction, which also helps solve the \mu
problem. Such models can emerge naturally in top-down constructions and are a
version of split supersymmetry. The spectrum contains heavy sfermions,
Higgsinos, exotics, and Z' ~ 10-100 TeV; light gauginos ~ 100-1000 GeV; a light
Higgs ~ 140 GeV; and a light singlino. A specific set of U'(1) charges and
exotics is analyzed, and we present five benchmark models. Implications for the
gluino lifetime, cold dark matter, and the gravitino and neutrino masses are
discussed.
| [
{
"created": "Mon, 8 Oct 2007 20:02:48 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2008 19:27:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Langacker",
"Paul",
""
],
[
"Paz",
"Gil",
""
],
[
"Wang",
"Lian-Tao",
""
],
[
"Yavin",
"Itay",
""
]
] | We consider a class of models in which supersymmetry breaking is communicated dominantly via a U'(1) gauge interaction, which also helps solve the \mu problem. Such models can emerge naturally in top-down constructions and are a version of split supersymmetry. The spectrum contains heavy sfermions, Higgsinos, exotics, and Z' ~ 10-100 TeV; light gauginos ~ 100-1000 GeV; a light Higgs ~ 140 GeV; and a light singlino. A specific set of U'(1) charges and exotics is analyzed, and we present five benchmark models. Implications for the gluino lifetime, cold dark matter, and the gravitino and neutrino masses are discussed. |
hep-ph/9403250 | null | G. Degrassi, S. Fanchiotti and P. Gambino | Two-loop next-to-leading $\mt$ corrections to the $\rho$ parameter | CERN-TH.7180/94, DFPD 94/TH/12 and NYU-Th-94/02/01, 26 pages (LaTeX +
PS figures, needs psfig (optional to include figures), doublespace,
equations, and cite styles) | Int.J.Mod.Phys. A10 (1995) 1377-1392 | 10.1142/S0217751X95000668 | null | hep-ph | null | The $O(G^2_\mu m_t^4)$ correction to the $\rho$ parameter is computed within
the Standard Model using the current algebra formulation of radiative
corrections. This approach is proved to be equivalent to the effective
Lagrangian method proposed by Barbieri {\em et al.} Using the same framework,
the $O(G^2_\mu m_t^2 m_z^2)$ correction to the ratio of neutral-to-charged
current amplitudes is analysed in an $SU(2)$ model. The $O(G^2_\mu m_t^2
m_z^2)$ contribution is shown to be numerically comparable to the leading
$O(G^2_\mu m_t^4)$ term for realistic values of the top mass. The resummation
of higher-order effects is discussed.
| [
{
"created": "Wed, 9 Mar 1994 12:00:04 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Degrassi",
"G.",
""
],
[
"Fanchiotti",
"S.",
""
],
[
"Gambino",
"P.",
""
]
] | The $O(G^2_\mu m_t^4)$ correction to the $\rho$ parameter is computed within the Standard Model using the current algebra formulation of radiative corrections. This approach is proved to be equivalent to the effective Lagrangian method proposed by Barbieri {\em et al.} Using the same framework, the $O(G^2_\mu m_t^2 m_z^2)$ correction to the ratio of neutral-to-charged current amplitudes is analysed in an $SU(2)$ model. The $O(G^2_\mu m_t^2 m_z^2)$ contribution is shown to be numerically comparable to the leading $O(G^2_\mu m_t^4)$ term for realistic values of the top mass. The resummation of higher-order effects is discussed. |
1401.6458 | Christopher McCabe | Celine Boehm, Matthew J. Dolan, Christopher McCabe, Michael
Spannowsky, Chris J. Wallace | Extended gamma-ray emission from Coy Dark Matter | 8 pages, 3 figures. v2: Minor changes to match published (JCAP)
version | null | 10.1088/1475-7516/2014/05/009 | IPPP/13/31, DCPT/13/62, SLAC-PUB-15893 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that it is possible for WIMP dark matter to produce a large signal in
indirect dark matter searches without producing signals elsewhere. We
illustrate our point by fitting the Fermi-LAT extended galactic gamma-ray
excess with a simple model of Dirac dark matter that annihilates primarily into
b quarks via a pseudoscalar. Current collider constraints are weak while the 14
TeV LHC run will constrain a limited portion of the parameter space. No signal
is expected in additional indirect searches or at future direct detection
experiments. Our results emphasise the importance of fully understanding
potential indirect signals of dark matter as they may provide the only
information about the dark matter particle.
| [
{
"created": "Fri, 24 Jan 2014 21:00:19 GMT",
"version": "v1"
},
{
"created": "Thu, 8 May 2014 12:17:32 GMT",
"version": "v2"
}
] | 2014-05-09 | [
[
"Boehm",
"Celine",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"McCabe",
"Christopher",
""
],
[
"Spannowsky",
"Michael",
""
],
[
"Wallace",
"Chris J.",
""
]
] | We show that it is possible for WIMP dark matter to produce a large signal in indirect dark matter searches without producing signals elsewhere. We illustrate our point by fitting the Fermi-LAT extended galactic gamma-ray excess with a simple model of Dirac dark matter that annihilates primarily into b quarks via a pseudoscalar. Current collider constraints are weak while the 14 TeV LHC run will constrain a limited portion of the parameter space. No signal is expected in additional indirect searches or at future direct detection experiments. Our results emphasise the importance of fully understanding potential indirect signals of dark matter as they may provide the only information about the dark matter particle. |
1410.1873 | Mathieu Cliche | Kfir Blum, Mathieu Cliche, Csaba Csaki and Seung J. Lee | WIMP Dark Matter through the Dilaton Portal | 28 pages, LaTeX; v2: section 4 corrected | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model in which dark matter couples to the Standard Model through a
dilaton of a sector with spontaneously broken approximate scale invariance.
Scale invariance fixes the dilaton couplings to the Standard Model and dark
matter fields, leaving three main free parameters: the symmetry breaking scale
$f$, the dilaton mass $m_{\sigma}$, and the dark matter mass $m_{\chi}$. We
analyze the experimental constraints on the parameter space from collider,
direct and indirect detection experiments including the effect of Sommerfeld
enhancement, and show that dilaton exchange provides a consistent, calculable
framework for cold dark matter with $f,\,m_\sigma,\,m_\chi$ of roughly similar
magnitude and in the range $\sim 1-10$ TeV. Direct and indirect detection
experiments, notably future ground-based gamma ray and space-based cosmic ray
measurements, can probe the model all the way to dark matter mass in the
multi-TeV regime.
| [
{
"created": "Tue, 7 Oct 2014 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 2014 14:32:37 GMT",
"version": "v2"
}
] | 2014-10-31 | [
[
"Blum",
"Kfir",
""
],
[
"Cliche",
"Mathieu",
""
],
[
"Csaki",
"Csaba",
""
],
[
"Lee",
"Seung J.",
""
]
] | We study a model in which dark matter couples to the Standard Model through a dilaton of a sector with spontaneously broken approximate scale invariance. Scale invariance fixes the dilaton couplings to the Standard Model and dark matter fields, leaving three main free parameters: the symmetry breaking scale $f$, the dilaton mass $m_{\sigma}$, and the dark matter mass $m_{\chi}$. We analyze the experimental constraints on the parameter space from collider, direct and indirect detection experiments including the effect of Sommerfeld enhancement, and show that dilaton exchange provides a consistent, calculable framework for cold dark matter with $f,\,m_\sigma,\,m_\chi$ of roughly similar magnitude and in the range $\sim 1-10$ TeV. Direct and indirect detection experiments, notably future ground-based gamma ray and space-based cosmic ray measurements, can probe the model all the way to dark matter mass in the multi-TeV regime. |
1801.10528 | Qing-Feng Sun | Qing-Feng Sun and An-Min Wang | Next-to-leading order QCD corrections to the decay of Higgs to vector
meson and Z boson | 10 pages, 3 figures, 3 tables | Chinese Physics C, Vol. 42, No. 3 (2018) 033105 | 10.1088/1674-1137/42/3/033105 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The exclusive decay of the Higgs boson to a vector meson ($ J/\psi $ or $
\Upsilon(1S) $) and $ Z $ boson is studied in this work. The decay amplitudes
are separated into two parts in a gauge invariant manner. The first part comes
from the direct coupling of the Higgs boson to the charm (bottom) quark and the
other from the $ HZZ^{*} $ or the loop-induced $ HZ\gamma^{*} $ vertexes in the
standard model. While the branching ratios from the direct channel are much
smaller than those of the indirect channel, their interference terms give
nontrivial contributions. We further calculate the QCD radiative corrections to
both channels, which reduce the total branching ratios by around 20% for both $
J/\psi $ and $ \Upsilon(1S) $ production. These results may help to check the
SM predictions of the $ H c\bar{c}(H b\bar{b}) $ coupling and to seek for hints
of new physics at the High Luminosity LHC or future hadron colliders.
| [
{
"created": "Wed, 31 Jan 2018 16:27:38 GMT",
"version": "v1"
}
] | 2018-02-01 | [
[
"Sun",
"Qing-Feng",
""
],
[
"Wang",
"An-Min",
""
]
] | The exclusive decay of the Higgs boson to a vector meson ($ J/\psi $ or $ \Upsilon(1S) $) and $ Z $ boson is studied in this work. The decay amplitudes are separated into two parts in a gauge invariant manner. The first part comes from the direct coupling of the Higgs boson to the charm (bottom) quark and the other from the $ HZZ^{*} $ or the loop-induced $ HZ\gamma^{*} $ vertexes in the standard model. While the branching ratios from the direct channel are much smaller than those of the indirect channel, their interference terms give nontrivial contributions. We further calculate the QCD radiative corrections to both channels, which reduce the total branching ratios by around 20% for both $ J/\psi $ and $ \Upsilon(1S) $ production. These results may help to check the SM predictions of the $ H c\bar{c}(H b\bar{b}) $ coupling and to seek for hints of new physics at the High Luminosity LHC or future hadron colliders. |
hep-ph/0202038 | Koshiro Suzuki | Masaaki Fujii and Koshiro Suzuki | Investigation of noscale supersymmetry breaking models with a gauged
U(1)_{B-L} symmetry | 23 pages, 5 eps figures | Phys.Rev. D66 (2002) 035002 | 10.1103/PhysRevD.66.035002 | UT-02-06 | hep-ph | null | Noscale supersymmetry (SUSY) breaking model is investigated in the minimal
extension of the minimal supersymmetric standard model (MSSM) with a gauged
U(1)_{B-L} symmetry. We specifically consider a unification-inspired model with
the gauge groups SU(3)_{C} \times SU(2)_{L} \times U(1)_Y \times U(1)_{B-L}
\subset SU(5) \times U(1)_{5} for illustration. While the noscale boundary
condition at the grand unification scale (M_{G}\simeq 2\times 10^{16} GeV) in
the MSSM is not consistent with phenomenological constraints, we show that it
is if the gaugino of the U(1)_{5} multiplet is several times heavier than the
gauginos of the MSSM. However, if SU(5) \times U(1)_{5} is further embedded in
a larger simple group, e.g. SO(10), the noscale boundary condition at M_{G} is
inconsistent with phenomenological constraints. If we relax the noscale
boundary condition and allow non-zero soft scalar masses for the Higgs fields
which spontaneously break the U(1)_{5} symmetry, the resultant spectrum of SUSY
particles becomes consistent with all the phenomenological constraints, even if
we impose the GUT relation on the gauge coupling and the gaugino mass of the
U(1)_{5}. In this case, the SUSY CP problem is also solved, since the condition
B\mu =0 at the boundary can be imposed consistently with the electroweak
symmetry breaking.
| [
{
"created": "Tue, 5 Feb 2002 14:08:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Fujii",
"Masaaki",
""
],
[
"Suzuki",
"Koshiro",
""
]
] | Noscale supersymmetry (SUSY) breaking model is investigated in the minimal extension of the minimal supersymmetric standard model (MSSM) with a gauged U(1)_{B-L} symmetry. We specifically consider a unification-inspired model with the gauge groups SU(3)_{C} \times SU(2)_{L} \times U(1)_Y \times U(1)_{B-L} \subset SU(5) \times U(1)_{5} for illustration. While the noscale boundary condition at the grand unification scale (M_{G}\simeq 2\times 10^{16} GeV) in the MSSM is not consistent with phenomenological constraints, we show that it is if the gaugino of the U(1)_{5} multiplet is several times heavier than the gauginos of the MSSM. However, if SU(5) \times U(1)_{5} is further embedded in a larger simple group, e.g. SO(10), the noscale boundary condition at M_{G} is inconsistent with phenomenological constraints. If we relax the noscale boundary condition and allow non-zero soft scalar masses for the Higgs fields which spontaneously break the U(1)_{5} symmetry, the resultant spectrum of SUSY particles becomes consistent with all the phenomenological constraints, even if we impose the GUT relation on the gauge coupling and the gaugino mass of the U(1)_{5}. In this case, the SUSY CP problem is also solved, since the condition B\mu =0 at the boundary can be imposed consistently with the electroweak symmetry breaking. |
hep-ph/0503096 | Kamal Benslama | G. Azuelos, K. Benslama and J. Ferland | Prospects for the Search for a Doubly-Charged Higgs in the Left-Right
Symmetric Model with ATLAS | null | J.Phys.G32:73-92,2006 | 10.1088/0954-3899/32/2/002 | null | hep-ph | null | We estimate the potential for observation at the LHC of a doubly charged
Higgs boson, as predicted in Left-Right symmetric models. Single production by
vector boson fusion, $W^+W^+ \to \Delta_{L,R}^{++}$ and pair production by the
Drell-Yan process $q \bar q \to \Delta_{L,R}^{++}\Delta_{L,R}^{--}$ are
considered. Various decay channels are investigated: dileptons, including pairs
of $\tau$'s, as well as $WW$
| [
{
"created": "Thu, 10 Mar 2005 18:09:34 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Azuelos",
"G.",
""
],
[
"Benslama",
"K.",
""
],
[
"Ferland",
"J.",
""
]
] | We estimate the potential for observation at the LHC of a doubly charged Higgs boson, as predicted in Left-Right symmetric models. Single production by vector boson fusion, $W^+W^+ \to \Delta_{L,R}^{++}$ and pair production by the Drell-Yan process $q \bar q \to \Delta_{L,R}^{++}\Delta_{L,R}^{--}$ are considered. Various decay channels are investigated: dileptons, including pairs of $\tau$'s, as well as $WW$ |
1606.05270 | Adil Jueid | Abdesslam Arhrib and Adil Jueid | $tbW$ Anomalous Couplings in the Two Higgs Doublet Model | 30 pages, 7 figures and 6 tables. Matches published version | JHEP 1608 (2016) 082 | 10.1007/JHEP08(2016)082 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a complete one loop calculation of the $tbW$ couplings in the Two
Higgs Doublet Model. We evaluate both the anomalous couplings $g_L$ and $g_R$
as well as left handed and right handed component of $tbW$. The computation is
done in the Feynman gauge using the on-shell scheme renormalization for the
Standard Model wave functions and parameters. We first show that the relative
corrections to these anomalous couplings are rather small in most regions of
the parameter space. We then analyze the effects of these anomalous couplings
on certain observables such as top quark polarization in single top production
through $t-$channel as well as $W^\pm$ boson helicity fractions in top decay.
| [
{
"created": "Thu, 16 Jun 2016 17:06:30 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2016 22:53:40 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Oct 2019 16:59:20 GMT",
"version": "v3"
}
] | 2019-10-29 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Jueid",
"Adil",
""
]
] | We make a complete one loop calculation of the $tbW$ couplings in the Two Higgs Doublet Model. We evaluate both the anomalous couplings $g_L$ and $g_R$ as well as left handed and right handed component of $tbW$. The computation is done in the Feynman gauge using the on-shell scheme renormalization for the Standard Model wave functions and parameters. We first show that the relative corrections to these anomalous couplings are rather small in most regions of the parameter space. We then analyze the effects of these anomalous couplings on certain observables such as top quark polarization in single top production through $t-$channel as well as $W^\pm$ boson helicity fractions in top decay. |
1401.3631 | Daniele Binosi | A. C. Aguilar, D. Binosi, J. Papavassiliou | Renormalization group analysis of the gluon mass equation | 33 pages, 11 figures | Phys. Rev. D 89, 085032 (2014) | 10.1103/PhysRevD.89.085032 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we carry out a systematic study of the renormalization
properties of the integral equation that determines the momentum evolution of
the effective gluon mass. A detailed, all-order analysis of the complete kernel
appearing in this particular equation reveals that the renormalization
procedure may be accomplished through the sole use of ingredients known from
the standard perturbative treatment of the theory, with no additional
assumptions. However, the subtle interplay of terms operating at the level of
the exact equation gets distorted by the approximations usually employed when
evaluating the aforementioned kernel. This fact is reflected in the form of the
obtained solutions, whose deviations from the correct behavior are best
quantified by resorting to appropriately defined renormalization-group
invariant quantities. This analysis, in turn, provides a solid guiding
principle for improving the form of the kernel, and furnishes a well-defined
criterion for discriminating between various possibilities. Certain
renormalization-group inspired Ans\"atze for the kernel are then proposed, and
their numerical implications are explored in detail. One of the solutions
obtained fulfills the theoretical expectations to a high degree of accuracy,
yielding a gluon mass that is positive-definite throughout the entire range of
physical momenta, and displays in the ultraviolet the so-called "power-law"
running, in agreement with standard arguments based on the operator product
expansion. Some of the technical difficulties thwarting a more rigorous
determination of the kernel are discussed, and possible future directions are
briefly mentioned.
| [
{
"created": "Wed, 15 Jan 2014 15:36:32 GMT",
"version": "v1"
}
] | 2014-04-23 | [
[
"Aguilar",
"A. C.",
""
],
[
"Binosi",
"D.",
""
],
[
"Papavassiliou",
"J.",
""
]
] | In the present work we carry out a systematic study of the renormalization properties of the integral equation that determines the momentum evolution of the effective gluon mass. A detailed, all-order analysis of the complete kernel appearing in this particular equation reveals that the renormalization procedure may be accomplished through the sole use of ingredients known from the standard perturbative treatment of the theory, with no additional assumptions. However, the subtle interplay of terms operating at the level of the exact equation gets distorted by the approximations usually employed when evaluating the aforementioned kernel. This fact is reflected in the form of the obtained solutions, whose deviations from the correct behavior are best quantified by resorting to appropriately defined renormalization-group invariant quantities. This analysis, in turn, provides a solid guiding principle for improving the form of the kernel, and furnishes a well-defined criterion for discriminating between various possibilities. Certain renormalization-group inspired Ans\"atze for the kernel are then proposed, and their numerical implications are explored in detail. One of the solutions obtained fulfills the theoretical expectations to a high degree of accuracy, yielding a gluon mass that is positive-definite throughout the entire range of physical momenta, and displays in the ultraviolet the so-called "power-law" running, in agreement with standard arguments based on the operator product expansion. Some of the technical difficulties thwarting a more rigorous determination of the kernel are discussed, and possible future directions are briefly mentioned. |
1207.2626 | Giulia Zanderighi | Barbara Jager, Steven Schneider and Giulia Zanderighi | Next-to-leading order QCD corrections to electroweak Zjj production in
the POWHEGBOX | 12 pages, 5 figures | null | 10.1007/JHEP09(2012)083 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an implementation of electroweak Z-boson production in association
with two jets at hadron colliders in the POWHEG framework, a method that allows
the interfacing of NLO-QCD calculations with parton-shower Monte Carlo
programs. We focus on the leptonic decays of the weak gauge boson, and take
photonic and non-resonant contributions to the matrix elements fully into
account. We provide results for observables of particular importance for the
suppression of QCD backgrounds to vector-boson fusion processes by means of
central-jet-veto techniques. While parton-shower effects are small for most
observables associated with the two hardest jets, they can be more pronounced
for distributions that are employed in central-jet-veto studies.
| [
{
"created": "Wed, 11 Jul 2012 13:04:24 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Jager",
"Barbara",
""
],
[
"Schneider",
"Steven",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We present an implementation of electroweak Z-boson production in association with two jets at hadron colliders in the POWHEG framework, a method that allows the interfacing of NLO-QCD calculations with parton-shower Monte Carlo programs. We focus on the leptonic decays of the weak gauge boson, and take photonic and non-resonant contributions to the matrix elements fully into account. We provide results for observables of particular importance for the suppression of QCD backgrounds to vector-boson fusion processes by means of central-jet-veto techniques. While parton-shower effects are small for most observables associated with the two hardest jets, they can be more pronounced for distributions that are employed in central-jet-veto studies. |
1108.6009 | N\'estor Quintero | D. Delepine, G. Lopez Castro and N. Quintero | Lepton number violation in top quark and neutral B meson decays | 15 pages, 6 figures, "Added comments on sensitivities. Version
accepted for publication" | Phys. Rev. D 84, 096011 (2011) | 10.1103/PhysRevD.84.096011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lepton number violation (LNV) can be induced by Majorana neutrinos in
four-body decays of the neutral B meson and the top quark. We study the effects
of Majorana neutrinos in these |\Delta L|=2 decays in an scenario where a
single heavy neutrino can enhance the amplitude via the resonant mechanism.
Using current bounds on heavy neutrino mixings, the most optimistic branching
ratios turn out to be at the level of 10^{-6} for \bar{B} -> D^+e^-e^-\pi^+ and
t -> bl^+l^+W^- decays. Searches for these LNV decays at future facilities can
provide complementary constraints on masses and mixings of Majorana neutrinos.
| [
{
"created": "Tue, 30 Aug 2011 16:49:36 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2011 22:29:17 GMT",
"version": "v2"
}
] | 2011-12-05 | [
[
"Delepine",
"D.",
""
],
[
"Castro",
"G. Lopez",
""
],
[
"Quintero",
"N.",
""
]
] | Lepton number violation (LNV) can be induced by Majorana neutrinos in four-body decays of the neutral B meson and the top quark. We study the effects of Majorana neutrinos in these |\Delta L|=2 decays in an scenario where a single heavy neutrino can enhance the amplitude via the resonant mechanism. Using current bounds on heavy neutrino mixings, the most optimistic branching ratios turn out to be at the level of 10^{-6} for \bar{B} -> D^+e^-e^-\pi^+ and t -> bl^+l^+W^- decays. Searches for these LNV decays at future facilities can provide complementary constraints on masses and mixings of Majorana neutrinos. |
hep-ph/0601075 | Francois Arleo | Francois Arleo | Hard pion and prompt photon at RHIC, from single to double inclusive
production | 31 pages, 11 figures | JHEP 0609 (2006) 015 | 10.1088/1126-6708/2006/09/015 | CERN-PH-TH/2005-222 | hep-ph nucl-th | null | Single pion and prompt photon large transverse momentum spectra in p-p and
Au-Au collisions are computed in perturbative QCD at RHIC energy, s^1/2 = 200
GeV. Next-to-leading order calculations are discussed and compared with p-p
scattering data. Subsequently, quenching factors are computed to leading order
for both pions and photons within the same energy loss model. The good
agreement with PHENIX preliminary data allows for a lower estimate of the
energy density reached in central Au-Au collisions, epsilon > 10 GeV/fm^3.
Double inclusive photon-pion production in p-p and Au-Au collisions is then
addressed. Next-to-leading order corrections prove rather small in p-p
scattering. In Au-Au collisions, the quenching of momentum-correlation spectra
is seen to be sensitive to parton energy loss processes, which would help to
understand how the fragmentation dynamics is modified in nuclear collisions at
RHIC.
| [
{
"created": "Tue, 10 Jan 2006 13:06:27 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Arleo",
"Francois",
""
]
] | Single pion and prompt photon large transverse momentum spectra in p-p and Au-Au collisions are computed in perturbative QCD at RHIC energy, s^1/2 = 200 GeV. Next-to-leading order calculations are discussed and compared with p-p scattering data. Subsequently, quenching factors are computed to leading order for both pions and photons within the same energy loss model. The good agreement with PHENIX preliminary data allows for a lower estimate of the energy density reached in central Au-Au collisions, epsilon > 10 GeV/fm^3. Double inclusive photon-pion production in p-p and Au-Au collisions is then addressed. Next-to-leading order corrections prove rather small in p-p scattering. In Au-Au collisions, the quenching of momentum-correlation spectra is seen to be sensitive to parton energy loss processes, which would help to understand how the fragmentation dynamics is modified in nuclear collisions at RHIC. |
hep-ph/0409334 | Junjie Cao | Junjie Cao, Guoli Liu, Jin Min Yang | Probing Topcolor-Assisted Technicolor from Like-sign Top Pair Production
at LHC | 10 pages, 6 figs | Phys.Rev.D70:114035,2004 | 10.1103/PhysRevD.70.114035 | null | hep-ph hep-ex | null | The topcolor-assisted technicolor (TC2) theory predicts tree-level
flavor-changing neutral-current (FCNC) top quark Yukawa couplings with
top-pions. Such FCNC interactions will induce like-sign top quark pair
productions at CERN Large Hadron Collider (LHC). While these rare productions
are far below the observable level in the Standard Model and other popular new
physics models such as the Minimal Supersymmetric Model, we find that in a
sound part of parameter space the TC2 model can enhance the production cross
sections to several tens of fb and thus may be observable at the LHC due to
rather low backgrounds. Searching for these productions at the LHC will serve
as an excellent probe for the TC2 model.
| [
{
"created": "Wed, 29 Sep 2004 11:11:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cao",
"Junjie",
""
],
[
"Liu",
"Guoli",
""
],
[
"Yang",
"Jin Min",
""
]
] | The topcolor-assisted technicolor (TC2) theory predicts tree-level flavor-changing neutral-current (FCNC) top quark Yukawa couplings with top-pions. Such FCNC interactions will induce like-sign top quark pair productions at CERN Large Hadron Collider (LHC). While these rare productions are far below the observable level in the Standard Model and other popular new physics models such as the Minimal Supersymmetric Model, we find that in a sound part of parameter space the TC2 model can enhance the production cross sections to several tens of fb and thus may be observable at the LHC due to rather low backgrounds. Searching for these productions at the LHC will serve as an excellent probe for the TC2 model. |
1705.07446 | Gennady Lykasov I | A.P.Ierusalimov, G.I.Lykasov | Dielectron production in pion-nucleon reactions at intermediate energies | 12 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dielectron production in the $\pi N$ interaction at not large energies is
studied. The dominant contribution of the $\Delta$-isobar creation in the
intermediate state at incident pion momenta of about 0.3-0.4 GeV$/$c is shown.
The experimental distributions over the angle and effective mass $M_{e^+e_-}$
of the $e^+e^-$ pair are described satisfactorily. This stimulated us to
present theoretical predictions for the $M_{e^+e_-}$ distribution in the
process $\pi^- p\rightarrow ne^+e^-$ at different incident momenta, which could
be verified, for example, by the HADES experiments.
| [
{
"created": "Sun, 21 May 2017 13:31:10 GMT",
"version": "v1"
}
] | 2017-05-23 | [
[
"Ierusalimov",
"A. P.",
""
],
[
"Lykasov",
"G. I.",
""
]
] | Dielectron production in the $\pi N$ interaction at not large energies is studied. The dominant contribution of the $\Delta$-isobar creation in the intermediate state at incident pion momenta of about 0.3-0.4 GeV$/$c is shown. The experimental distributions over the angle and effective mass $M_{e^+e_-}$ of the $e^+e^-$ pair are described satisfactorily. This stimulated us to present theoretical predictions for the $M_{e^+e_-}$ distribution in the process $\pi^- p\rightarrow ne^+e^-$ at different incident momenta, which could be verified, for example, by the HADES experiments. |
1812.04067 | Julian Heeck | Julian Heeck, Manfred Lindner, Werner Rodejohann, Stefan Vogl | Non-Standard Neutrino Interactions and Neutral Gauge Bosons | 25 pages; improved discussion of mass-mixing case; to appear in
SciPost | SciPost Phys. 6, 038 (2019) | 10.21468/SciPostPhys.6.3.038 | ULB-TH/18-15, UCI-TR-2018-20 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate Non-Standard Neutrino Interactions (NSI) arising from a
flavor-sensitive $Z'$ boson of a new $U(1)'$ symmetry. We compare the limits
from neutrino oscillations, coherent elastic neutrino-nucleus scattering, and
$Z'$ searches at different beam and collider experiments for a variety of
straightforward anomaly-free $U(1)'$ models generated by linear combinations of
$B-L$ and lepton-family-number differences $L_\alpha-L_\beta$. Depending on the
flavor structure of those models it is easily possible to avoid NSI signals in
long-baseline neutrino oscillation experiments or change the relative
importance of the various experimental searches. We also point out that kinetic
$Z$-$Z'$ mixing gives vanishing NSI in long-baseline experiments if a direct
coupling between the $U(1)'$ gauge boson and matter is absent. In contrast,
$Z$-$Z'$ mass mixing generates such NSI, which in turn means that there is a
Higgs multiplet charged under both the Standard Model and the new $U(1)'$
symmetry.
| [
{
"created": "Mon, 10 Dec 2018 20:22:50 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2019 12:28:21 GMT",
"version": "v2"
}
] | 2019-03-28 | [
[
"Heeck",
"Julian",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Rodejohann",
"Werner",
""
],
[
"Vogl",
"Stefan",
""
]
] | We investigate Non-Standard Neutrino Interactions (NSI) arising from a flavor-sensitive $Z'$ boson of a new $U(1)'$ symmetry. We compare the limits from neutrino oscillations, coherent elastic neutrino-nucleus scattering, and $Z'$ searches at different beam and collider experiments for a variety of straightforward anomaly-free $U(1)'$ models generated by linear combinations of $B-L$ and lepton-family-number differences $L_\alpha-L_\beta$. Depending on the flavor structure of those models it is easily possible to avoid NSI signals in long-baseline neutrino oscillation experiments or change the relative importance of the various experimental searches. We also point out that kinetic $Z$-$Z'$ mixing gives vanishing NSI in long-baseline experiments if a direct coupling between the $U(1)'$ gauge boson and matter is absent. In contrast, $Z$-$Z'$ mass mixing generates such NSI, which in turn means that there is a Higgs multiplet charged under both the Standard Model and the new $U(1)'$ symmetry. |
hep-ph/9401306 | Steve Godfrey | G. Couture and S. Godfrey | A Phenomenological Study of the Process
$e^+e^-\to\mu^+\mu^-\nu_l\bar\nu_l$ at High Energy $e^+e^-$ Colliders and
Measurement of the $ZWW$ and $\gamma WW$ Couplings | 33 pages, OCIP/C 93-18, UQAM-PHE-9306 | Phys.Rev. D49 (1994) 5709-5719 | 10.1103/PhysRevD.49.5709 | null | hep-ph | null | We perform a detailed study of the process $e^+e^-\to
\mu^+\mu^-\nu_l\bar\nu_l$ including all contributions. The contributions other
than from real gauge boson production leads to a rich phenomenology. We explore
the use of the process as a means of precision measurement of the $ZWW$ and
$\gamma WW$ vertices. We concentrate on LEP II energies, $\sqrt{s}=200$ GeV,
and energies appropriate to the proposed Next Linear Collider (NLC) high energy
$e^+e^-$ collider with center of mass energies $\sqrt{s}=500$ and 1~TeV. At 200
GeV, the process offers, at best, a consistency check of other processes being
considered at LEP200. At 500~GeV, the parameters $\kappa_\gamma$,
$\lambda_\gamma$, $\kappa_Z$, and $\lambda_Z$ can be measured to about $\pm
0.1$ or better at 95\% C.L. while at 1 TeV, they can be measured to about $\pm
0.01$. At the high luminosities anticipated at high energy linear colliders
precision measurements are likely to be limited by systematic rather than
statistical errors.
| [
{
"created": "Fri, 21 Jan 1994 18:51:53 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Couture",
"G.",
""
],
[
"Godfrey",
"S.",
""
]
] | We perform a detailed study of the process $e^+e^-\to \mu^+\mu^-\nu_l\bar\nu_l$ including all contributions. The contributions other than from real gauge boson production leads to a rich phenomenology. We explore the use of the process as a means of precision measurement of the $ZWW$ and $\gamma WW$ vertices. We concentrate on LEP II energies, $\sqrt{s}=200$ GeV, and energies appropriate to the proposed Next Linear Collider (NLC) high energy $e^+e^-$ collider with center of mass energies $\sqrt{s}=500$ and 1~TeV. At 200 GeV, the process offers, at best, a consistency check of other processes being considered at LEP200. At 500~GeV, the parameters $\kappa_\gamma$, $\lambda_\gamma$, $\kappa_Z$, and $\lambda_Z$ can be measured to about $\pm 0.1$ or better at 95\% C.L. while at 1 TeV, they can be measured to about $\pm 0.01$. At the high luminosities anticipated at high energy linear colliders precision measurements are likely to be limited by systematic rather than statistical errors. |
hep-ph/0511155 | Marco Ruggieri | V. Laporta and M. Ruggieri | Effect of neutrino trapping on the three flavor FFLO phase of QCD | 12 pages, 2 figures, RevTeX4 class. Changed Fig. 2 (see text) and
some reference added | Phys.Lett.B633:734-738,2006; Erratum-ibid.B673:383,2006 | 10.1016/j.physletb.2006.03.066 | null | hep-ph | null | We compute the effect of a non-zero lepton chemical potential on the
structure of the three flavor Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase of
QCD at finite temperature. We show that, as in the BCS case, the lepton
chemical potential favors two-species color superconductivity and disfavors the
three species pairing. We stress that this study could be relevant for the
cooling of a proto-neutron star with a FFLO core, if the temperatures are
higher than the un-trapping temperature.
| [
{
"created": "Sat, 12 Nov 2005 19:12:56 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Mar 2006 14:04:57 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Laporta",
"V.",
""
],
[
"Ruggieri",
"M.",
""
]
] | We compute the effect of a non-zero lepton chemical potential on the structure of the three flavor Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase of QCD at finite temperature. We show that, as in the BCS case, the lepton chemical potential favors two-species color superconductivity and disfavors the three species pairing. We stress that this study could be relevant for the cooling of a proto-neutron star with a FFLO core, if the temperatures are higher than the un-trapping temperature. |
hep-ph/0005140 | Piet Mulders | A. Bacchetta, M. Boglione, A. Henneman and P.J. Mulders | The full spin structure of quarks in the nucleon | 10 pages with figures, LaTex, uses epsfig.sty. Invited talk by P.J.
Mulders at the workshop on Nucleon Structure in the High x-Bjorken Region
(HiX2000), Temple University, Philadelphia, PA, USA; March 30 - April 1, 2000 | null | null | null | hep-ph | null | We discuss bounds on the distribution and fragmentation functions that appear
at leading order in deep inelastic 1-particle inclusive leptoproduction or in
Drell-Yan processes. These bounds simply follow from positivity of the
quark-hadron scattering matrix elements and are an important guide in
estimating the magnitude of the azimuthal and spin asymmetries in these
processes. We focus on an example relevant for deep inelastic scattering at
relatively low energies.
| [
{
"created": "Mon, 15 May 2000 15:05:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bacchetta",
"A.",
""
],
[
"Boglione",
"M.",
""
],
[
"Henneman",
"A.",
""
],
[
"Mulders",
"P. J.",
""
]
] | We discuss bounds on the distribution and fragmentation functions that appear at leading order in deep inelastic 1-particle inclusive leptoproduction or in Drell-Yan processes. These bounds simply follow from positivity of the quark-hadron scattering matrix elements and are an important guide in estimating the magnitude of the azimuthal and spin asymmetries in these processes. We focus on an example relevant for deep inelastic scattering at relatively low energies. |
hep-ph/9301277 | null | X. Zhang | Operator Analysis for the Higgs Potential and Cosmological Bound on the
Higgs-Boson Mass | 10 Pages, Tex, UMDHEP 93-074 | Phys.Rev. D47 (1993) 3065-3067 | 10.1103/PhysRevD.47.3065 | null | hep-ph | null | Using effective lagrangian, we examine the impacts of new physics on the
electroweak baryogenesis. By analysing the high dimensional operators relevent
to the Higgs potential we point out that the Higgs mass bound required by
electroweak baryogenesis can be relaxed to the region allowed by experiments,
provided that new physics appears at the TeV scale.
| [
{
"created": "Tue, 26 Jan 1993 18:24:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Zhang",
"X.",
""
]
] | Using effective lagrangian, we examine the impacts of new physics on the electroweak baryogenesis. By analysing the high dimensional operators relevent to the Higgs potential we point out that the Higgs mass bound required by electroweak baryogenesis can be relaxed to the region allowed by experiments, provided that new physics appears at the TeV scale. |
hep-ph/0509359 | Walter Winter | Andre de Gouvea and Walter Winter | What would it take to determine the neutrino mass hierarchy if
$\theta_{13}$ were too small? | 22 pages, 10 color figures | Phys.Rev. D73 (2006) 033003 | 10.1103/PhysRevD.73.033003 | NUHEP-TH/05-09 | hep-ph hep-ex | null | We discuss the experimental requirements for a mass hierarchy measurement for
$\theta_{13}=0$ using muon neutrino disappearance. We find that a specially
optimized neutrino factory at $L \simeq 6 \,000 \, \mathrm{km}$ could do this
measurement using extreme luminosities. In particular, we do not require charge
identification for this purpose. In order to measure the mass hierarchy for
more adequate luminosities, we explore the capabilities of low energy narrow
band off-axis beams, which have relatively more events at low energies. We find
that, in this case, the energy resolution of the detector quickly becomes the
limiting factor of the measurement, and significantly affects the baseline
optimization for determining the mass hierarchy.
| [
{
"created": "Thu, 29 Sep 2005 21:22:02 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"de Gouvea",
"Andre",
""
],
[
"Winter",
"Walter",
""
]
] | We discuss the experimental requirements for a mass hierarchy measurement for $\theta_{13}=0$ using muon neutrino disappearance. We find that a specially optimized neutrino factory at $L \simeq 6 \,000 \, \mathrm{km}$ could do this measurement using extreme luminosities. In particular, we do not require charge identification for this purpose. In order to measure the mass hierarchy for more adequate luminosities, we explore the capabilities of low energy narrow band off-axis beams, which have relatively more events at low energies. We find that, in this case, the energy resolution of the detector quickly becomes the limiting factor of the measurement, and significantly affects the baseline optimization for determining the mass hierarchy. |
1710.07352 | Aurore Courtoy | A. Courtoy | The Tensor and the Scalar Charges of the Nucleon from Hadron
Phenomenology | To appear in the proceedings of the ISMD 2017, held in Tlaxcala,
Mexico, September 11-15, 2017. Includes .cls and .bst files for EPJ Web of
Conferences. arXiv admin note: substantial text overlap with arXiv:1608.04429 | null | 10.1051/epjconf/201817203007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the impact of the determination of the nucleon tensor charge on
searches for physics Beyond the Standard Model. We also comment on the future
extraction of the subleading-twist PDF $e(x)$ from Jefferson Lab
soon-to-be-released Beam Spin Asymmetry data as well as from the expected data
of CLAS12, as the latter is related to the scalar charge. These analyses are
possible through the phenomenology of Dihadron Fragmentation Functions related
processes, which we report on here as well.
| [
{
"created": "Wed, 18 Oct 2017 16:46:12 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Courtoy",
"A.",
""
]
] | We discuss the impact of the determination of the nucleon tensor charge on searches for physics Beyond the Standard Model. We also comment on the future extraction of the subleading-twist PDF $e(x)$ from Jefferson Lab soon-to-be-released Beam Spin Asymmetry data as well as from the expected data of CLAS12, as the latter is related to the scalar charge. These analyses are possible through the phenomenology of Dihadron Fragmentation Functions related processes, which we report on here as well. |
hep-ph/9704314 | Yuri Golubkov | Yu.A.Golubkov (Moscow State University) and R.V.Konoplich (Moscow
Engineering Physics Institute) | Cosmic Ray Constraints On the Annihilation of Heavy Stable Neutrinos in
the Galactic Halo | 19 pages, 4 Postscript figures, Latex | Yad.Fiz. 61 (1998) 675; Phys.Atom.Nucl. 61 (1998) 602 | null | DESY 97-057 | hep-ph astro-ph | null | We carry out a detailed analysis of fluxes of cosmic ray antiprotons,
positrons, electrons and photons to be expected from the annihilation of relic
heavy neutrinos in the galactic halo. The spectra of particles are evaluated by
Monte Carlo simulation. The results of calculations show that the investigation
of cosmic ray positron spectra at high energies could provide a distinctive
signal for annihilation of very heavy neutrinos in the Galaxy and give an
important information on parameters of dark matter particles.
| [
{
"created": "Mon, 14 Apr 1997 07:42:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Golubkov",
"Yu. A.",
"",
"Moscow State University"
],
[
"Konoplich",
"R. V.",
"",
"Moscow\n Engineering Physics Institute"
]
] | We carry out a detailed analysis of fluxes of cosmic ray antiprotons, positrons, electrons and photons to be expected from the annihilation of relic heavy neutrinos in the galactic halo. The spectra of particles are evaluated by Monte Carlo simulation. The results of calculations show that the investigation of cosmic ray positron spectra at high energies could provide a distinctive signal for annihilation of very heavy neutrinos in the Galaxy and give an important information on parameters of dark matter particles. |
hep-ph/0502151 | Ben Allanach | B.C. Allanach, A. Brignole and L.E. Ibanez | Phenomenology of a Fluxed MSSM | 18 pages, minor revisions | JHEP0505:030,2005 | 10.1088/1126-6708/2005/05/030 | null | hep-ph hep-th | null | We analyze the phenomenology of a set of minimal supersymmetric standard
model (MSSM) soft terms inspired by flux-induced supersymmetry (SUSY)-breaking
in Type IIB string orientifolds. The scheme is extremely constrained with
essentially only two free mass parameters: a parameter M, which sets the scale
of soft terms, and the mu parameter. After imposing consistent radiative
electro-weak symmetry breaking (EWSB) the model depends upon one mass parameter
(say, M). In spite of being so constrained one finds consistency with EWSB
conditions. We demonstrate that those conditions have two solutions for mu<0,
and none for mu>0. The parameter tan beta results as a prediction and is
approximately 3-5 for one solution, and 25-40 for the other, depending upon M
and the top mass. We examine further constraints on the model coming from b->s
gamma, the muon g-2, Higgs mass limits and WMAP constraints on dark matter. The
MSSM spectrum is predicted in terms of the single free parameter M. The low tan
beta branch is consistent with a relatively light spectrum although it is
compatible with standard cosmology only if the lightest neutralino is unstable.
The high tan beta branch is compatible with all phenomenological constraints,
but has quite a heavy spectrum. We argue that the fine-tuning associated to
this heavy spectrum would be substantially ameliorated if an additional
relationship mu=-2M were present in the underlying theory.
| [
{
"created": "Wed, 16 Feb 2005 18:24:52 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2005 10:19:10 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Allanach",
"B. C.",
""
],
[
"Brignole",
"A.",
""
],
[
"Ibanez",
"L. E.",
""
]
] | We analyze the phenomenology of a set of minimal supersymmetric standard model (MSSM) soft terms inspired by flux-induced supersymmetry (SUSY)-breaking in Type IIB string orientifolds. The scheme is extremely constrained with essentially only two free mass parameters: a parameter M, which sets the scale of soft terms, and the mu parameter. After imposing consistent radiative electro-weak symmetry breaking (EWSB) the model depends upon one mass parameter (say, M). In spite of being so constrained one finds consistency with EWSB conditions. We demonstrate that those conditions have two solutions for mu<0, and none for mu>0. The parameter tan beta results as a prediction and is approximately 3-5 for one solution, and 25-40 for the other, depending upon M and the top mass. We examine further constraints on the model coming from b->s gamma, the muon g-2, Higgs mass limits and WMAP constraints on dark matter. The MSSM spectrum is predicted in terms of the single free parameter M. The low tan beta branch is consistent with a relatively light spectrum although it is compatible with standard cosmology only if the lightest neutralino is unstable. The high tan beta branch is compatible with all phenomenological constraints, but has quite a heavy spectrum. We argue that the fine-tuning associated to this heavy spectrum would be substantially ameliorated if an additional relationship mu=-2M were present in the underlying theory. |
1812.01151 | Thomas A. Trainor | Thomas A. Trainor | A two-component model for identified-hadron $\bf p_t$ spectra from 5 TeV
p-Pb collisions | 20 pages, 10 figures, updated to published version | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In preparation for the heavy ion program at the relativistic heavy ion
collider (RHIC) $d$-Au collisions were designated as a control experiment for
possible discovery of a quark-gluon plasma (QGP) in more-central Au-Au
collisions, and contrasting results from the two systems seemed to support such
a discovery. In contrast, recent results ($p_t$-spectrum and
angular-correlation features) from $p$-Pb collisions at the large hadron
collider (LHC) have been interpreted to support claims of hydrodynamic flows
and QGP formation even in small collision systems. The present study addresses
such claims via a two-component (soft + hard) model (TCM) of identified-hadron
(PID) $p_t$ spectra from 5 TeV $p$-Pb collisions. $p$-Pb centrality is adopted
from a previous study of ensemble-mean $\bar p_t$ data from the same system.
$p$-Pb $p_t$ spectra for pions, kaons, protons and Lambdas are described by the
TCM within their point-to-point uncertainties. Invariance of the TCM hard
component vs $p$-Pb centrality indicates that jet formation remains unchanged
in $p$-Pb collisions relative to $p$-$p$ collisions, and radial-flow
contributions to spectra are negligible. These $p$-Pb TCM results have
implications for interpretation of similar data features from A-A collisions in
terms of QGP formation.
| [
{
"created": "Tue, 4 Dec 2018 00:57:58 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jan 2020 23:19:08 GMT",
"version": "v2"
}
] | 2020-01-14 | [
[
"Trainor",
"Thomas A.",
""
]
] | In preparation for the heavy ion program at the relativistic heavy ion collider (RHIC) $d$-Au collisions were designated as a control experiment for possible discovery of a quark-gluon plasma (QGP) in more-central Au-Au collisions, and contrasting results from the two systems seemed to support such a discovery. In contrast, recent results ($p_t$-spectrum and angular-correlation features) from $p$-Pb collisions at the large hadron collider (LHC) have been interpreted to support claims of hydrodynamic flows and QGP formation even in small collision systems. The present study addresses such claims via a two-component (soft + hard) model (TCM) of identified-hadron (PID) $p_t$ spectra from 5 TeV $p$-Pb collisions. $p$-Pb centrality is adopted from a previous study of ensemble-mean $\bar p_t$ data from the same system. $p$-Pb $p_t$ spectra for pions, kaons, protons and Lambdas are described by the TCM within their point-to-point uncertainties. Invariance of the TCM hard component vs $p$-Pb centrality indicates that jet formation remains unchanged in $p$-Pb collisions relative to $p$-$p$ collisions, and radial-flow contributions to spectra are negligible. These $p$-Pb TCM results have implications for interpretation of similar data features from A-A collisions in terms of QGP formation. |
hep-ph/9910541 | Masayuki Matsuzaki | Masayuki Matsuzaki (Fukuoka University of Education) | Spatial structure of quark Cooper pairs in a color superconductor | 10 pages, 3 figures. The frequency dependence of the gap and the
limitation on the type I/type II discussion are mentioned briefly. To appear
in Phys. Rev. D | Phys.Rev. D62 (2000) 017501 | 10.1103/PhysRevD.62.017501 | null | hep-ph astro-ph nucl-th | null | Spatial structure of Cooper pairs with quantum numbers color 3^*, I=J=L=S=0
in ud 2 flavor quark matter is studied by solving the gap equation and
calculating the coherence length in full momentum range without the weak
coupling approximation. Although the gap at the Fermi surface and the coherence
length depend on density weakly, the shape of the r-space pair wave function
varies strongly with density. This result indicates that quark Cooper pairs
become more bosonic at higher densities.
| [
{
"created": "Fri, 29 Oct 1999 08:43:48 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2000 09:01:19 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Matsuzaki",
"Masayuki",
"",
"Fukuoka University of Education"
]
] | Spatial structure of Cooper pairs with quantum numbers color 3^*, I=J=L=S=0 in ud 2 flavor quark matter is studied by solving the gap equation and calculating the coherence length in full momentum range without the weak coupling approximation. Although the gap at the Fermi surface and the coherence length depend on density weakly, the shape of the r-space pair wave function varies strongly with density. This result indicates that quark Cooper pairs become more bosonic at higher densities. |
2006.04640 | Alessandra Filippi | Alessandra Filippi and Marzio De Napoli | Searching in the dark: the hunt for the dark photon | 36 pages, 12 figures ~ Changes in new submission: Fig.12 caption,
line 8: ref. [52] replaces [71] ~ Additional references suggested after
proofs submission: about dark photon "thermal targets" and the definition of
y: Izaguirre E. et al., Phys. Rev. Lett. 115 (2015), 251301 - about inelastic
dark matter models: R. Foot and S. Vagnozzi, Phys. Rev. D 91 (2015) 023512;
JCAP 1607 (2016) 013 | Rev.Phys. 5 (2020) 100042 | 10.1016/j.revip.2020.100042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of Dark Matter (DM) is a well established fact since many
decades, thanks to the observation of the effects of its gravitational
interaction with the ordinary matter in the Universe. However, our knowledge of
the Dark Matter features is still rather scarce. Indeed, one of the biggest
quests in fundamental science today is the investigation of Dark Matter nature,
from its origin to its composition, and the way its constituents interact with
the ordinary matter, apart from gravity. Huge and ambitious efforts have been
spent in the last years into its identification, concentrating especially on
the search of viable Weakly Interacting Massive Particle candidates. However,
no positive results have been achieved so far along this direction. On the
other hand, many fascinating new ideas and models for its interpretation have
been blooming: among them, an intriguing hypothesis is that the Dark Matter
constituents could be neutral under Standard Model interactions, but they could
interact through a new, still unknown, force under a "hidden" charge. This new
hidden symmetry would be mediated by a massive gauge boson, the dark photon,
which is expected to couple to the Standard Model via a kinetic mixing. The
search for such a massive mediator has been pursued with large enthusiasm and
dedication in the latest years, as its observation could be within the reach of
many already existing experimental facilities, both based on accelerators
| [
{
"created": "Mon, 8 Jun 2020 14:41:09 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Sep 2020 10:55:22 GMT",
"version": "v2"
}
] | 2020-09-08 | [
[
"Filippi",
"Alessandra",
""
],
[
"De Napoli",
"Marzio",
""
]
] | The existence of Dark Matter (DM) is a well established fact since many decades, thanks to the observation of the effects of its gravitational interaction with the ordinary matter in the Universe. However, our knowledge of the Dark Matter features is still rather scarce. Indeed, one of the biggest quests in fundamental science today is the investigation of Dark Matter nature, from its origin to its composition, and the way its constituents interact with the ordinary matter, apart from gravity. Huge and ambitious efforts have been spent in the last years into its identification, concentrating especially on the search of viable Weakly Interacting Massive Particle candidates. However, no positive results have been achieved so far along this direction. On the other hand, many fascinating new ideas and models for its interpretation have been blooming: among them, an intriguing hypothesis is that the Dark Matter constituents could be neutral under Standard Model interactions, but they could interact through a new, still unknown, force under a "hidden" charge. This new hidden symmetry would be mediated by a massive gauge boson, the dark photon, which is expected to couple to the Standard Model via a kinetic mixing. The search for such a massive mediator has been pursued with large enthusiasm and dedication in the latest years, as its observation could be within the reach of many already existing experimental facilities, both based on accelerators |
1007.1913 | Boris Kopeliovich | B. Z. Kopeliovich, H. J. Pirner, I. K. Potashnikova, and Ivan Schmidt | Mutual boosting of the saturation scales in colliding nuclei | 12 pages, 4 figures. Extended version to be published in Phys. Lett.
B | Phys.Lett.B697:333-338,2011 | 10.1016/j.physletb.2011.02.018 | USM-TH-269 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Saturation of small-x gluons in a nucleus, which has the form of transverse
momentum broadening of projectile gluons in pA collisions in the nuclear rest
frame, leads to a modification of the parton distribution functions in the beam
compared with pp collisions. The DGLAP driven gluon distribution turns out to
be suppressed at large x, but significantly enhanced at x<<1. This is a high
twist effect. In the case of nucleus-nucleus collisions all participating
nucleons on both sides get enriched in gluon density at small x, which leads to
a further boosting of the saturation scale. We derive reciprocity equations for
the saturation scales corresponding to a collision of two nuclei. The solution
of these equations for central collisions of two heavy nuclei demonstrate a
significant, up to several times, enhancement of Q_{sA}^2, in AA compared with
pA collisions.
| [
{
"created": "Mon, 12 Jul 2010 14:36:42 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2011 20:20:03 GMT",
"version": "v2"
}
] | 2011-03-03 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Pirner",
"H. J.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | Saturation of small-x gluons in a nucleus, which has the form of transverse momentum broadening of projectile gluons in pA collisions in the nuclear rest frame, leads to a modification of the parton distribution functions in the beam compared with pp collisions. The DGLAP driven gluon distribution turns out to be suppressed at large x, but significantly enhanced at x<<1. This is a high twist effect. In the case of nucleus-nucleus collisions all participating nucleons on both sides get enriched in gluon density at small x, which leads to a further boosting of the saturation scale. We derive reciprocity equations for the saturation scales corresponding to a collision of two nuclei. The solution of these equations for central collisions of two heavy nuclei demonstrate a significant, up to several times, enhancement of Q_{sA}^2, in AA compared with pA collisions. |
1511.04283 | Rob Knoops | Ignatios Antoniadis, Rob Knoops | Gauging MSSM global symmetries and SUSY breaking in de Sitter vacuum | 23 pages, 5 figures | null | 10.1016/j.nuclphysb.2015.12.016 | CERN-PH-TH-2015-268 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elaborate on a recent study of a model of supersymmetry breaking we
proposed recently, in the presence of a tunable positive cosmological constant,
based on a gauged shift symmetry of a string modulus, external to the Standard
Model (SM) sector. Here, we identify this symmetry with a global symmetry of
the SM and work out the corresponding phenomenology. A particularly attracting
possibility is to use a combination of Baryon and Lepton number that contains
the known matter parity and guarantees absence of dimension-four and five
operators that violate B and L.
| [
{
"created": "Fri, 13 Nov 2015 14:11:25 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Antoniadis",
"Ignatios",
""
],
[
"Knoops",
"Rob",
""
]
] | We elaborate on a recent study of a model of supersymmetry breaking we proposed recently, in the presence of a tunable positive cosmological constant, based on a gauged shift symmetry of a string modulus, external to the Standard Model (SM) sector. Here, we identify this symmetry with a global symmetry of the SM and work out the corresponding phenomenology. A particularly attracting possibility is to use a combination of Baryon and Lepton number that contains the known matter parity and guarantees absence of dimension-four and five operators that violate B and L. |
2111.15310 | Christian Fischer | Nico Santowsky and Christian S. Fischer | Four-quark states with charm quarks in a two-body Bethe-Salpeter
approach | 9 pages, 4 figures; v2: minor changes, version accepted for EPJC | null | 10.1140/epjc/s10052-022-10272-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the internal structure of a range of four-quark states with charm
quark contributions using a two-body Bethe-Salpeter equation. Thereby, we
examine charmonium-like states with hidden charm and quark content
$c\bar{c}q\bar{q}$, open-charm states with quark content $cc\bar{q}\bar{q}$ and
all-charm states with $cc\bar{c}\bar{c}$. In particular we study the internal
competition between meson-meson components and diquark-antidiquark components
in the wave functions of these states. Our results indicate that the
$\chi_{c1}(3872)$ and the $Z_c(3900)$ are predominantly $D\bar D^*$ states and
that the recently discovered open-charm state $T_{cc}^+$ is dominated by an
internal $DD^*$ component. In both cases the diquark components are negligible.
For the all-charm state $X(6900)$ with as yet unknown quantum numbers we
identify candidates in the excitation spectra of $0^+$ and $1^+$ states.
Furthermore, our framework serves to provide predictions for further, yet
undiscovered open and hidden charm four-quark states.
| [
{
"created": "Tue, 30 Nov 2021 11:46:27 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2022 07:18:53 GMT",
"version": "v2"
}
] | 2022-04-27 | [
[
"Santowsky",
"Nico",
""
],
[
"Fischer",
"Christian S.",
""
]
] | We study the internal structure of a range of four-quark states with charm quark contributions using a two-body Bethe-Salpeter equation. Thereby, we examine charmonium-like states with hidden charm and quark content $c\bar{c}q\bar{q}$, open-charm states with quark content $cc\bar{q}\bar{q}$ and all-charm states with $cc\bar{c}\bar{c}$. In particular we study the internal competition between meson-meson components and diquark-antidiquark components in the wave functions of these states. Our results indicate that the $\chi_{c1}(3872)$ and the $Z_c(3900)$ are predominantly $D\bar D^*$ states and that the recently discovered open-charm state $T_{cc}^+$ is dominated by an internal $DD^*$ component. In both cases the diquark components are negligible. For the all-charm state $X(6900)$ with as yet unknown quantum numbers we identify candidates in the excitation spectra of $0^+$ and $1^+$ states. Furthermore, our framework serves to provide predictions for further, yet undiscovered open and hidden charm four-quark states. |
0709.1371 | Emil Avsar | Emil Avsar | On the Dipole Swing and the Search for Frame Independence in the Dipole
Model | null | JHEP0711:027,2007 | 10.1088/1126-6708/2007/11/027 | null | hep-ph | null | Small-x evolution in QCD is conveniently described by Mueller's dipole model
which, however, does not include saturation effects in a way consistent with
boost invariance. In this paper we first show that the recently studied zero
and one dimensional toy models exhibiting saturation and explicit boost
invariance can be interpreted in terms positive definite k-> k+1 dipole
vertices. Such k-> k+1 vertices can in the full model be generated by combining
the usual dipole splitting with k-1 simultaneous dipole swings. We show that,
for a system consisting of N dipoles, one needs to combine the dipole splitting
with at most N-1 simultaneous swings in order to generate all colour
correlations induced by the multiple dipole interactions.
| [
{
"created": "Mon, 10 Sep 2007 14:45:50 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2007 12:32:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Avsar",
"Emil",
""
]
] | Small-x evolution in QCD is conveniently described by Mueller's dipole model which, however, does not include saturation effects in a way consistent with boost invariance. In this paper we first show that the recently studied zero and one dimensional toy models exhibiting saturation and explicit boost invariance can be interpreted in terms positive definite k-> k+1 dipole vertices. Such k-> k+1 vertices can in the full model be generated by combining the usual dipole splitting with k-1 simultaneous dipole swings. We show that, for a system consisting of N dipoles, one needs to combine the dipole splitting with at most N-1 simultaneous swings in order to generate all colour correlations induced by the multiple dipole interactions. |
hep-ph/0410127 | Yuri B. Ivanov | Yu.B. Ivanov, V.V. Skokov, V.D. Toneev | Equation of state of deconfined matter within dynamical quasiparticle
description | 18 pages, 11 figures, version accepted to Phys. Rev. D | Phys.Rev. D71 (2005) 014005 | 10.1103/PhysRevD.71.014005 | null | hep-ph hep-lat nucl-th | null | A simple quasiparticle model, motivated by lowest-order perturbative QCD, is
proposed. It is applied to interpret the lattice QCD equation of state. A
reasonable reproduction of the lattice data is obtained. In contrast to
existing quasiparticle models, the present model is formulated in dynamical
rather than thermodynamical terms, and is easily applicable to a system with
finite baryon density. In particular, the model simulates the confinement
property.
| [
{
"created": "Fri, 8 Oct 2004 10:19:23 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Dec 2004 09:28:02 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ivanov",
"Yu. B.",
""
],
[
"Skokov",
"V. V.",
""
],
[
"Toneev",
"V. D.",
""
]
] | A simple quasiparticle model, motivated by lowest-order perturbative QCD, is proposed. It is applied to interpret the lattice QCD equation of state. A reasonable reproduction of the lattice data is obtained. In contrast to existing quasiparticle models, the present model is formulated in dynamical rather than thermodynamical terms, and is easily applicable to a system with finite baryon density. In particular, the model simulates the confinement property. |
hep-ph/9905372 | Marc Vanderhaeghen | M. Vanderhaeghen, P.A.M. Guichon and M. Guidal | Deeply virtual electroproduction of photons and mesons on the nucleon :
leading order amplitudes and power corrections | 59 pages, 21 figures | Phys.Rev. D60 (1999) 094017 | 10.1103/PhysRevD.60.094017 | null | hep-ph | null | We estimate the leading order amplitudes for exclusive photon and meson
electroproduction reactions at large Q^2 in the valence region in terms of
skewed quark distributions. As experimental investigations can currently only
be envisaged at moderate values of Q^2, we estimate power corrections due to
the intrinsic transverse momentum of the partons in the meson wavefunction and
in the nucleon. To this aim the skewed parton distribution formalism is
generalized so as to include the parton intrinsic transverse momentum
dependence. Furthermore, for the meson electroproduction reactions, we
calculate the soft overlap type contributions and compare with the leading
order amplitudes. We give first estimates for these different power corrections
in kinematics which are relevant for experiments in the near future.
| [
{
"created": "Mon, 17 May 1999 18:28:57 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Vanderhaeghen",
"M.",
""
],
[
"Guichon",
"P. A. M.",
""
],
[
"Guidal",
"M.",
""
]
] | We estimate the leading order amplitudes for exclusive photon and meson electroproduction reactions at large Q^2 in the valence region in terms of skewed quark distributions. As experimental investigations can currently only be envisaged at moderate values of Q^2, we estimate power corrections due to the intrinsic transverse momentum of the partons in the meson wavefunction and in the nucleon. To this aim the skewed parton distribution formalism is generalized so as to include the parton intrinsic transverse momentum dependence. Furthermore, for the meson electroproduction reactions, we calculate the soft overlap type contributions and compare with the leading order amplitudes. We give first estimates for these different power corrections in kinematics which are relevant for experiments in the near future. |
0704.1103 | Dr A. N. Mitra | A.N. Mitra | Spin Dynamics Of $qqq$ Wave Function On Light Front In High Momentum
Limit Of QCD : Role Of $qqq$ Force | 28 pages dvi with 1 figure | Annals Phys.323:845-865,2008 | 10.1016/j.aop.2007.05.008 | null | hep-ph | null | The contribution of a spin-rich $qqq$ force (in conjunction with pairwise
$qq$ forces) to the analytical structure of the $qqq$ wave function is worked
out in the high momentum regime of QCD where the confining interaction may be
ignored, so that the dominant effect is $Coulombic$. A distinctive feature of
this study is that the spin-rich $qqq$ force is generated by a $ggg$ vertex (a
genuine part of the QCD Lagrangian) wherein the 3 radiating gluon lines end on
as many quark lines, giving rise to a (Mercedes-Benz type) $Y$-shaped diagram.
The dynamics is that of a Salpeter-like equation (3D support for the kernel)
formulated covariantly on the light front, a la Markov-Yukawa Transversality
Principle (MYTP) which warrants a 2-way interconnection between the 3D and 4D
Bethe-Salpeter (BSE) forms for 2 as well as 3 fermion quarks. With these
ingredients, the differential equation for the 3D wave function $\phi$ receives
well-defined contributions from the $qq$ and $qqq$ forces. In particular a
$negative$ eigenvalue of the spin operator $i \sigma_1.\sigma_2\times \sigma_3$
which is an integral part of the $qqq$ force, causes a characteristic
singularity in the differential equation, signalling the dynamical effect of a
spin-rich $qqq$ force not yet considered in the literature. The potentially
crucial role of this interesting effect vis-a-vis the so-called `spin anomaly'
of the proton, is a subject of considerable physical interest.
| [
{
"created": "Mon, 9 Apr 2007 13:08:21 GMT",
"version": "v1"
}
] | 2009-04-21 | [
[
"Mitra",
"A. N.",
""
]
] | The contribution of a spin-rich $qqq$ force (in conjunction with pairwise $qq$ forces) to the analytical structure of the $qqq$ wave function is worked out in the high momentum regime of QCD where the confining interaction may be ignored, so that the dominant effect is $Coulombic$. A distinctive feature of this study is that the spin-rich $qqq$ force is generated by a $ggg$ vertex (a genuine part of the QCD Lagrangian) wherein the 3 radiating gluon lines end on as many quark lines, giving rise to a (Mercedes-Benz type) $Y$-shaped diagram. The dynamics is that of a Salpeter-like equation (3D support for the kernel) formulated covariantly on the light front, a la Markov-Yukawa Transversality Principle (MYTP) which warrants a 2-way interconnection between the 3D and 4D Bethe-Salpeter (BSE) forms for 2 as well as 3 fermion quarks. With these ingredients, the differential equation for the 3D wave function $\phi$ receives well-defined contributions from the $qq$ and $qqq$ forces. In particular a $negative$ eigenvalue of the spin operator $i \sigma_1.\sigma_2\times \sigma_3$ which is an integral part of the $qqq$ force, causes a characteristic singularity in the differential equation, signalling the dynamical effect of a spin-rich $qqq$ force not yet considered in the literature. The potentially crucial role of this interesting effect vis-a-vis the so-called `spin anomaly' of the proton, is a subject of considerable physical interest. |
2406.03931 | C. J. A. P. Martins | J. R. C. C. C. Correia, C. J. A. P. Martins, F. C. N. Q. Pimenta | Evolution of current-carrying string networks | 11 pages, 2 figures, 3 tables; to appear in Phys. Lett. B | null | null | null | hep-ph astro-ph.CO physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic string networks are expected to form in early Universe phase
transitions via the Kibble mechanism and are unavoidable in several Beyond the
Standard Model theories. While most predictions of observational signals of
string networks assume featureless Abelian-Higgs or Nambu-Goto string networks,
in many such extensions the networks can carry additional degrees of freedom,
including charges and currents; these are often generically known as
superconducting strings. All such degrees of freedom can impact the evolution
of the networks and therefore their observational signatures. We report on the
results of $2048^3$ field theory simulations of the evolution of a
current-carrying network of strings, highlighting the different scaling
behaviours of the network in the radiation and matter eras. We also report the
first numerical measurements of the coherence length scales for the charge and
current and of the condensate equation of state, and show that the latter
mainly depends on the expansion rate, with chirality occurring for the matter
era. Qualitatively, the fact that the matter era is the optimal expansion rate
for these networks to reach scaling is in agreement with recent analytic
modeling.
| [
{
"created": "Thu, 6 Jun 2024 10:17:35 GMT",
"version": "v1"
}
] | 2024-06-07 | [
[
"Correia",
"J. R. C. C. C.",
""
],
[
"Martins",
"C. J. A. P.",
""
],
[
"Pimenta",
"F. C. N. Q.",
""
]
] | Cosmic string networks are expected to form in early Universe phase transitions via the Kibble mechanism and are unavoidable in several Beyond the Standard Model theories. While most predictions of observational signals of string networks assume featureless Abelian-Higgs or Nambu-Goto string networks, in many such extensions the networks can carry additional degrees of freedom, including charges and currents; these are often generically known as superconducting strings. All such degrees of freedom can impact the evolution of the networks and therefore their observational signatures. We report on the results of $2048^3$ field theory simulations of the evolution of a current-carrying network of strings, highlighting the different scaling behaviours of the network in the radiation and matter eras. We also report the first numerical measurements of the coherence length scales for the charge and current and of the condensate equation of state, and show that the latter mainly depends on the expansion rate, with chirality occurring for the matter era. Qualitatively, the fact that the matter era is the optimal expansion rate for these networks to reach scaling is in agreement with recent analytic modeling. |
hep-ph/0101084 | Nick van Eijndhoven | Nick van Eijndhoven and Wouter Wetzels | In-event background and signal reconstruction for two-photon
invariant-mass analyses | null | Nucl.Instrum.Meth. A482 (2002) 513-519 | 10.1016/S0168-9002(01)01558-3 | null | hep-ph | null | A method is presented for the reconstruction of both the background and
signal in invariant-mass analyses for two-photon decays. The procedure does not
make use of event mixing techniques and as such is based exclusively on an
event-by-event analysis. Consequently, topological correlations of the event
(e.g. jet structures) are automatically taken into account. By means of the
decay process $\pi^{0} \to \gamma \gamma$ it will be demonstrated how the
procedure allows for determination of the $\pi^{0}$ yield from the observed
decay photons.
| [
{
"created": "Tue, 9 Jan 2001 17:55:01 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"van Eijndhoven",
"Nick",
""
],
[
"Wetzels",
"Wouter",
""
]
] | A method is presented for the reconstruction of both the background and signal in invariant-mass analyses for two-photon decays. The procedure does not make use of event mixing techniques and as such is based exclusively on an event-by-event analysis. Consequently, topological correlations of the event (e.g. jet structures) are automatically taken into account. By means of the decay process $\pi^{0} \to \gamma \gamma$ it will be demonstrated how the procedure allows for determination of the $\pi^{0}$ yield from the observed decay photons. |
2101.01958 | Bing-Dong Wan | Rui Ding, Bing-Dong Wan, Zi-Qiang Chen, Guo-Li Wang, and Cong-Feng
Qiao | Finding $B_c(3S)$ States via Their Strong Decays | 10 pages, 1 figure, to appear in PLB | null | 10.1016/j.physletb.2021.136277 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The experimentally known $B_c$ states are all below open bottom-charm
threshold, which experience three main decay modes, and all induced by weak
interaction. In this work, we investigate the mass spectrum and strong decays
of the $B_c(3S)$ states, which just above the threshold, in the Bethe-Salpeter
formalism and $^3P_0$ model. The numerical estimation gives
$M(B_c(3^1S_0))=7273\ {\rm MeV}$, $M(B_c^*(3^3S_1))=7304\ {\rm MeV}$,
$\Gamma\left(B_c(3^1S_0)\to B^*D\right)=26.02^{+2.33}_{-2.21}\ {\rm MeV}$,
$\Gamma\left(B_c^*(3^3S_1)\to BD\right)=3.39^{+0.27}_{-0.26}\ {\rm MeV}$,
$\Gamma\left(B_c^*(3^3S_1)\to B^*D\right)=14.77^{+1.40}_{-1.33}\ {\rm MeV}$ and
$\Gamma\left(B_c^*(3^3S_1)\to BD^*\right)=6.14^{+0.58}_{-0.54}\ {\rm MeV}$.
Compared with previous studies in non-relativistic approximation, our results
indicate that the relativistic effects are notable in $B_c(3S)$ exclusive
strong decays. According to the results, we suggest to find the $B_c(3S)$
states in their hadronic decays to $B$ and $D$ mesons in experiment, like the
LHCb.
| [
{
"created": "Wed, 6 Jan 2021 10:32:37 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2021 12:17:07 GMT",
"version": "v2"
}
] | 2021-04-14 | [
[
"Ding",
"Rui",
""
],
[
"Wan",
"Bing-Dong",
""
],
[
"Chen",
"Zi-Qiang",
""
],
[
"Wang",
"Guo-Li",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | The experimentally known $B_c$ states are all below open bottom-charm threshold, which experience three main decay modes, and all induced by weak interaction. In this work, we investigate the mass spectrum and strong decays of the $B_c(3S)$ states, which just above the threshold, in the Bethe-Salpeter formalism and $^3P_0$ model. The numerical estimation gives $M(B_c(3^1S_0))=7273\ {\rm MeV}$, $M(B_c^*(3^3S_1))=7304\ {\rm MeV}$, $\Gamma\left(B_c(3^1S_0)\to B^*D\right)=26.02^{+2.33}_{-2.21}\ {\rm MeV}$, $\Gamma\left(B_c^*(3^3S_1)\to BD\right)=3.39^{+0.27}_{-0.26}\ {\rm MeV}$, $\Gamma\left(B_c^*(3^3S_1)\to B^*D\right)=14.77^{+1.40}_{-1.33}\ {\rm MeV}$ and $\Gamma\left(B_c^*(3^3S_1)\to BD^*\right)=6.14^{+0.58}_{-0.54}\ {\rm MeV}$. Compared with previous studies in non-relativistic approximation, our results indicate that the relativistic effects are notable in $B_c(3S)$ exclusive strong decays. According to the results, we suggest to find the $B_c(3S)$ states in their hadronic decays to $B$ and $D$ mesons in experiment, like the LHCb. |
hep-ph/9604278 | Ralf Hempfling | Ralf Hempfling | The Next-to-Minimal Coleman-Weinberg Model | LaTeX typo corrected. 9 pages, 3 figs | Phys.Lett. B379 (1996) 153-158 | 10.1016/0370-2693(96)00446-7 | MPI-PhT/96-03 | hep-ph | null | In the standard model (SM) the condition that the Higgs mass parameter
vanishes is stable under radiative corrections and yields a theory that can be
renormalized using dimensional regularization. Thus, this model allows to
predict the Higgs boson mass. However, it is phenomenologically ruled out in
its minimal version. Here, we present a phenomenologically viable, minimal
extension which only includes an additional SM singlet and a U(1)$_X$ gauge
symmetry.
| [
{
"created": "Wed, 10 Apr 1996 07:33:44 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 1996 15:14:52 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Hempfling",
"Ralf",
""
]
] | In the standard model (SM) the condition that the Higgs mass parameter vanishes is stable under radiative corrections and yields a theory that can be renormalized using dimensional regularization. Thus, this model allows to predict the Higgs boson mass. However, it is phenomenologically ruled out in its minimal version. Here, we present a phenomenologically viable, minimal extension which only includes an additional SM singlet and a U(1)$_X$ gauge symmetry. |
1402.0777 | Jialun Ping | Chengrong Deng, Jialun Ping, Fan Wang | Interpreting $Z_c(3900)$ and $Z_c(4025)/Z_c(4020)$ as charged tetraquark
states | 8 pages, no figure | Phys. Rev. D 90, 054009 (2014) | 10.1103/PhysRevD.90.054009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of color flux-tube model with a four-body confinement
potential, the lowest charged tetraquark states
$[Qq][\bar{Q}'\bar{q}']~(Q=c,b,q=u,d,s)$ are studied by using the variational
method, Gaussian expansion method. The results indicate that some compact
resonance states can be formed, the states can not decay into two color singlet
mesons $Q\bar{q}'$ and $\bar{Q}'q$ through the breakdown and recombination of
color flux tubes but into $Q\bar{Q}'$ and $q\bar{q}'$. The four-body
confinement potential is an crucial dynamical mechanism for the formation of
states, The decay mechanism is similar to that of compound nucleus and
therefore the states should be called "color confined, multi-quark resonance"
states. The newly observed charged states $Z_c(3900)$ and $Z_c(4025)/Z_c(4020)$
can be accommodated in the color flux-tube model and can be interpreted as the
$S$-wave tetraquark states $[cu][{\bar{c}\bar{d}}]$ with quantum numbers $I=1$
and $J=1$ and 2, respectively.
| [
{
"created": "Tue, 4 Feb 2014 15:52:26 GMT",
"version": "v1"
}
] | 2014-09-17 | [
[
"Deng",
"Chengrong",
""
],
[
"Ping",
"Jialun",
""
],
[
"Wang",
"Fan",
""
]
] | In the framework of color flux-tube model with a four-body confinement potential, the lowest charged tetraquark states $[Qq][\bar{Q}'\bar{q}']~(Q=c,b,q=u,d,s)$ are studied by using the variational method, Gaussian expansion method. The results indicate that some compact resonance states can be formed, the states can not decay into two color singlet mesons $Q\bar{q}'$ and $\bar{Q}'q$ through the breakdown and recombination of color flux tubes but into $Q\bar{Q}'$ and $q\bar{q}'$. The four-body confinement potential is an crucial dynamical mechanism for the formation of states, The decay mechanism is similar to that of compound nucleus and therefore the states should be called "color confined, multi-quark resonance" states. The newly observed charged states $Z_c(3900)$ and $Z_c(4025)/Z_c(4020)$ can be accommodated in the color flux-tube model and can be interpreted as the $S$-wave tetraquark states $[cu][{\bar{c}\bar{d}}]$ with quantum numbers $I=1$ and $J=1$ and 2, respectively. |
1604.07975 | Matthew McCullough | Christoph Englert, Matthew McCullough, and Michael Spannowsky | S-Channel Dark Matter Simplified Models and Unitarity | 15 pages | null | null | DCPT/16/52, IPPP/16/26, CERN-TH-2016-094 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ultraviolet structure of $s$-channel mediator dark matter simplified
models at hadron colliders is considered. In terms of commonly studied
$s$-channel mediator simplified models it is argued that at arbitrarily high
energies the perturbative description of dark matter production in high energy
scattering at hadron colliders will break down in a number of cases. This is
analogous to the well documented breakdown of an EFT description of dark matter
collider production. With this in mind, to diagnose whether or not the use of
simplified models at the LHC is valid, perturbative unitarity of the scattering
amplitude in the processes relevant to LHC dark matter searches is studied. The
results are as one would expect: at the LHC and future proton colliders the
simplified model descriptions of dark matter production are in general valid.
As a result of the general discussion, a simple new class of previously
unconsidered `Fermiophobic Scalar' simplified models is proposed, in which a
scalar mediator couples to electroweak vector bosons. The Fermiophobic
simplified model is well motivated and exhibits interesting collider and direct
detection phenomenology.
| [
{
"created": "Wed, 27 Apr 2016 08:41:18 GMT",
"version": "v1"
}
] | 2016-04-28 | [
[
"Englert",
"Christoph",
""
],
[
"McCullough",
"Matthew",
""
],
[
"Spannowsky",
"Michael",
""
]
] | The ultraviolet structure of $s$-channel mediator dark matter simplified models at hadron colliders is considered. In terms of commonly studied $s$-channel mediator simplified models it is argued that at arbitrarily high energies the perturbative description of dark matter production in high energy scattering at hadron colliders will break down in a number of cases. This is analogous to the well documented breakdown of an EFT description of dark matter collider production. With this in mind, to diagnose whether or not the use of simplified models at the LHC is valid, perturbative unitarity of the scattering amplitude in the processes relevant to LHC dark matter searches is studied. The results are as one would expect: at the LHC and future proton colliders the simplified model descriptions of dark matter production are in general valid. As a result of the general discussion, a simple new class of previously unconsidered `Fermiophobic Scalar' simplified models is proposed, in which a scalar mediator couples to electroweak vector bosons. The Fermiophobic simplified model is well motivated and exhibits interesting collider and direct detection phenomenology. |
hep-ph/9805495 | Matthias Burkardt | M. Burkardt and H.El-Khozondar (New Mexico State University) | Wilson Fermions on a Transverse Lattice | 14 pages, RevTeX | Phys.Rev. D60 (1999) 054504 | 10.1103/PhysRevD.60.054504 | null | hep-ph | null | In the light-front formulation of field theory, it is possible to write down
a chirally invariant mass term. It thus appears as if one could solve the
species doubling problem on a light-front quantized transverse lattice in a
chirally invariant way. However, upon introducing link fields and after
renormalizing, one finds exactly the same LF Hamiltonian as if one had started
from the standard Wilson action in the first place. The (light-front) chirally
invariant transverse lattice regularization is thus not chirally invariant in
the conventional sense. As an application of the Wilson formulation for
fermions on a $\perp$ lattice, we calculate spectrum, distribution functions
and distribution amplitudes for mesons below $2 GeV$ in a truncated Fock space.
| [
{
"created": "Thu, 28 May 1998 19:08:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Burkardt",
"M.",
"",
"New Mexico State University"
],
[
"El-Khozondar",
"H.",
"",
"New Mexico State University"
]
] | In the light-front formulation of field theory, it is possible to write down a chirally invariant mass term. It thus appears as if one could solve the species doubling problem on a light-front quantized transverse lattice in a chirally invariant way. However, upon introducing link fields and after renormalizing, one finds exactly the same LF Hamiltonian as if one had started from the standard Wilson action in the first place. The (light-front) chirally invariant transverse lattice regularization is thus not chirally invariant in the conventional sense. As an application of the Wilson formulation for fermions on a $\perp$ lattice, we calculate spectrum, distribution functions and distribution amplitudes for mesons below $2 GeV$ in a truncated Fock space. |
1004.0087 | A. V. Luchinsky | A.K. Likhoded, A.V. Luchinsky | Light hadron production in $B_{c}\to B_{s}^{(*)}+X$ decays | minor changes, some references added | Phys.Rev.D82:014012,2010 | 10.1103/PhysRevD.82.014012 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article is devoted to Bc->Bs+n pi, Bc->Bs*+n pi decays with n=1, 2, 3, 4.
In the framework of factorization theorem the branching fractions of these
processes can be written as convolution of hard part, describing Bc->Bs W,
Bc->Bs* W vertices, and spectral functions, that correspond to transition of
virtual $W$-boson into a final pi-meson system. These functions were obtained
from the fit of experimental data on $\tau$-lepton decay and electron-positron
annihilation. Using different sets of Bc->Bs decay form-factors we present
branching fractions and distributions over the invariant mass of the final
pi-meson system.
| [
{
"created": "Thu, 1 Apr 2010 09:13:39 GMT",
"version": "v1"
},
{
"created": "Fri, 7 May 2010 09:07:04 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Likhoded",
"A. K.",
""
],
[
"Luchinsky",
"A. V.",
""
]
] | The article is devoted to Bc->Bs+n pi, Bc->Bs*+n pi decays with n=1, 2, 3, 4. In the framework of factorization theorem the branching fractions of these processes can be written as convolution of hard part, describing Bc->Bs W, Bc->Bs* W vertices, and spectral functions, that correspond to transition of virtual $W$-boson into a final pi-meson system. These functions were obtained from the fit of experimental data on $\tau$-lepton decay and electron-positron annihilation. Using different sets of Bc->Bs decay form-factors we present branching fractions and distributions over the invariant mass of the final pi-meson system. |
hep-ph/9403255 | null | Hitoshi Yamamoto | Isospin Analysis of Two-body B Decays and Test of Factorization | 8 pages, HUTP94/A006 | null | null | null | hep-ph | null | It is shown that the existing data on two-body B decays, some of them only
upper limits, are precise enough to perform an isospin analysis to extract the
phase shifts due to final state interaction. Unlike charm decays, no
significant final state interaction is observed in decays $B\to D\pi, D\rho$,
and $D^*\pi$ supporting the factorization hypothesis in these decays. By
fitting directly the isospin amplitudes obtained, we extract the ratio
$a_2/a_1$, where $a_1$ and $a_2$ are the coefficients in the factorized
effective Hamiltonian.
| [
{
"created": "Wed, 9 Mar 1994 19:26:19 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Yamamoto",
"Hitoshi",
""
]
] | It is shown that the existing data on two-body B decays, some of them only upper limits, are precise enough to perform an isospin analysis to extract the phase shifts due to final state interaction. Unlike charm decays, no significant final state interaction is observed in decays $B\to D\pi, D\rho$, and $D^*\pi$ supporting the factorization hypothesis in these decays. By fitting directly the isospin amplitudes obtained, we extract the ratio $a_2/a_1$, where $a_1$ and $a_2$ are the coefficients in the factorized effective Hamiltonian. |
0705.2510 | Daniele Dominici | R. Casalbuoni, S. De Curtis, D. Dominici and D. Dolce | Holographic approach to a minimal Higgsless model | Latex file, 23 pages | JHEP 0708:053,2007 | 10.1088/1126-6708/2007/08/053 | null | hep-ph hep-th | null | In this work, following an holographic approach, we carry out a low energy
effective study of a minimal Higgsless model based on SU(2) bulk symmetry
broken by boundary conditions, both in flat and warped metric. The holographic
procedure turns out to be an useful computation technique to achieve an
effective four dimensional formulation of the model taking into account the
corrections coming from the extra dimensional sector. This technique is used to
compute both oblique and direct contributions to the electroweak parameters in
presence of fermions delocalized along the fifth dimension.
| [
{
"created": "Thu, 17 May 2007 11:06:24 GMT",
"version": "v1"
}
] | 2009-04-21 | [
[
"Casalbuoni",
"R.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Dominici",
"D.",
""
],
[
"Dolce",
"D.",
""
]
] | In this work, following an holographic approach, we carry out a low energy effective study of a minimal Higgsless model based on SU(2) bulk symmetry broken by boundary conditions, both in flat and warped metric. The holographic procedure turns out to be an useful computation technique to achieve an effective four dimensional formulation of the model taking into account the corrections coming from the extra dimensional sector. This technique is used to compute both oblique and direct contributions to the electroweak parameters in presence of fermions delocalized along the fifth dimension. |
hep-ph/0001219 | Mary K. Gaillard | Mary K. Gaillard and Joel Giedt | A D-moduli problem? | 11 pages, full postscript also available from
http://phyweb.lbl.gov/theorygroup/papers/44856.ps | Phys.Lett.B479:308-314,2000 | 10.1016/S0370-2693(00)00336-1 | LBNL-44856, UCB-PTH-00/02 | hep-ph hep-th | null | We point out a generic problem in string-inspired supergravity models with an
anomalous $U(1)_X$. A large number of matter multiplets charged under $U(1)_X$
remain massless above the supersymmetry-breaking scale because of degeneracy of
vacua solving the D-flatness conditions. A toy model is analyzed as an
illustration of the mechanism; we find the surprising result that many scalars
remain massless after supersymmetry-breaking in a hidden sector.
| [
{
"created": "Thu, 20 Jan 2000 23:14:35 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gaillard",
"Mary K.",
""
],
[
"Giedt",
"Joel",
""
]
] | We point out a generic problem in string-inspired supergravity models with an anomalous $U(1)_X$. A large number of matter multiplets charged under $U(1)_X$ remain massless above the supersymmetry-breaking scale because of degeneracy of vacua solving the D-flatness conditions. A toy model is analyzed as an illustration of the mechanism; we find the surprising result that many scalars remain massless after supersymmetry-breaking in a hidden sector. |
1407.7374 | Michael Gronau | Mchael Gronau | New physics in singly Cabibbo-suppressed D decays | References added, to be published in Physics Letters B | null | 10.1016/j.physletb.2014.09.034 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A U-spin relation among four ratios of amplitudes for $D^0 \to \pi^+K^-$,
$K^+\pi^-$, $K^+K^-, \pi^+\pi^-$, including first, second and third order
U-spin breaking, has been derived recently with a precision of $10^{-3}$. We
study effects of new $|\Delta C|=1$ operators on this relation. We find that it
is not affected by U-spin scalar operators, including QCD penguin and
chromomagnetic dipole operators occurring in supersymmetric and
extra-dimensional models. The relation is modified by new $U=1$ operators with
a sensitivity of a few percent characteristic of second order U-spin breaking.
Combining this relation with CP asymmetries in $D^0\to K^+K^-, \pi^+\pi^-$
leads to a more solid constraint on $U=1$ operators than from asymmetries
alone.
| [
{
"created": "Mon, 28 Jul 2014 10:23:55 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Sep 2014 14:46:23 GMT",
"version": "v2"
}
] | 2014-09-24 | [
[
"Gronau",
"Mchael",
""
]
] | A U-spin relation among four ratios of amplitudes for $D^0 \to \pi^+K^-$, $K^+\pi^-$, $K^+K^-, \pi^+\pi^-$, including first, second and third order U-spin breaking, has been derived recently with a precision of $10^{-3}$. We study effects of new $|\Delta C|=1$ operators on this relation. We find that it is not affected by U-spin scalar operators, including QCD penguin and chromomagnetic dipole operators occurring in supersymmetric and extra-dimensional models. The relation is modified by new $U=1$ operators with a sensitivity of a few percent characteristic of second order U-spin breaking. Combining this relation with CP asymmetries in $D^0\to K^+K^-, \pi^+\pi^-$ leads to a more solid constraint on $U=1$ operators than from asymmetries alone. |
1607.01504 | Vladimir Braun M | I.V. Anikin, V.M. Braun, N. Offen | Axial form factor of the nucleon at large momentum transfers | A comparison to the new neutrino data analysis and several references
added. Final version to appear in Phys.Rev.D | Phys. Rev. D 94, 034011 (2016) | 10.1103/PhysRevD.94.034011 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the emerging possibilities to study threshold pion
electroproduction at large momentum transfers at Jefferson Laboratory following
the 12 GeV upgrade, we provide a short theory summary and an estimate of the
nucleon axial form factor for large virtualities in the $Q^2 =
1-10~\text{GeV}^2$ range using next-to-leading order light-cone sum rules.
| [
{
"created": "Wed, 6 Jul 2016 08:11:16 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2016 09:48:53 GMT",
"version": "v2"
}
] | 2016-08-10 | [
[
"Anikin",
"I. V.",
""
],
[
"Braun",
"V. M.",
""
],
[
"Offen",
"N.",
""
]
] | Motivated by the emerging possibilities to study threshold pion electroproduction at large momentum transfers at Jefferson Laboratory following the 12 GeV upgrade, we provide a short theory summary and an estimate of the nucleon axial form factor for large virtualities in the $Q^2 = 1-10~\text{GeV}^2$ range using next-to-leading order light-cone sum rules. |
hep-ph/0301259 | Scott Chapman | Dr. Scott Chapman | New Exact Solutions for QCD | 19 pages, no figures, clarified Lorentz invariance, extremum
conditions | null | null | null | hep-ph | null | A new class of exact quantum solutions of QCD is presented. These solutions
have negative energy and are stable to all fluctuations. The lowest-energy
solution state is explicitly constructed and proposed as a candidate for the
QCD vacuum. This vacuum exhibits confinement in the sense that any colored
quark configurations require infinite energy to create. In addition to the
vacuum, other solutions include hadrons whose mass and radius are
self-consistently determined as local minima of the energy.
| [
{
"created": "Thu, 30 Jan 2003 04:49:44 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2003 02:44:15 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chapman",
"Dr. Scott",
""
]
] | A new class of exact quantum solutions of QCD is presented. These solutions have negative energy and are stable to all fluctuations. The lowest-energy solution state is explicitly constructed and proposed as a candidate for the QCD vacuum. This vacuum exhibits confinement in the sense that any colored quark configurations require infinite energy to create. In addition to the vacuum, other solutions include hadrons whose mass and radius are self-consistently determined as local minima of the energy. |
1607.07106 | Artru | X. Artru, Z. Belghobsi, and E. Redouane-Salah | Transverse momentum correlations of quarks in recursive jet models | 7 pages, 3 figures, 1 table | Phys. Rev. D 94, 034034 (2016) | 10.1103/PhysRevD.94.034034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the symmetric string fragmentation recipe adopted by PYTHIA for jet
simulations, the transverse momenta of successive quarks are uncorrelated. This
is a simplification but has no theoretical reason. Transverse momentum
correlations are naturally expected, for instance, in a covariant
multiperipheral model of quark hadronization. We propose a simple recipe of
string fragmentation which lead to such correlations. The definition of the jet
axis and its relation with the primordial transverse momentum of the quark is
also discussed.
| [
{
"created": "Sun, 24 Jul 2016 22:34:15 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2016 07:26:11 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Artru",
"X.",
""
],
[
"Belghobsi",
"Z.",
""
],
[
"Redouane-Salah",
"E.",
""
]
] | In the symmetric string fragmentation recipe adopted by PYTHIA for jet simulations, the transverse momenta of successive quarks are uncorrelated. This is a simplification but has no theoretical reason. Transverse momentum correlations are naturally expected, for instance, in a covariant multiperipheral model of quark hadronization. We propose a simple recipe of string fragmentation which lead to such correlations. The definition of the jet axis and its relation with the primordial transverse momentum of the quark is also discussed. |
2110.10177 | Henning Bahl | Henning Bahl, Simon Brass | Constraining CP-violation in the Higgs-top-quark interaction using
machine-learning-based inference | 23 pages, 4 figures; v2: matches JHEP version | null | 10.1007/JHEP03(2022)017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While CP violation in the Higgs interactions with massive vector boson is
already tightly constrained, the CP nature of the Higgs interactions with
fermions is far less constrained. In this work, we assess the potential of
machine-learning-based inference methods to constrain CP violation in the Higgs
top-Yukawa coupling. This approach enables the use of the full available
kinematic information. Concentrating on top-associated Higgs production with
the Higgs decaying to two photons, we derive expected exclusion bounds for the
LHC and the high-luminosity phase of the LHC. We also study the dependence of
these bounds on the Higgs interaction with massive vector bosons and their
robustness against theoretical uncertainties. In addition to deriving expected
exclusion bounds, we discuss at which level a non-zero CP-violating top-Yukawa
coupling can be distinguished from the SM. Moreover, we analyze which kinematic
distributions are most sensitive to a CP-violating top-Yukawa coupling.
| [
{
"created": "Tue, 19 Oct 2021 18:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 03:33:54 GMT",
"version": "v2"
}
] | 2022-03-23 | [
[
"Bahl",
"Henning",
""
],
[
"Brass",
"Simon",
""
]
] | While CP violation in the Higgs interactions with massive vector boson is already tightly constrained, the CP nature of the Higgs interactions with fermions is far less constrained. In this work, we assess the potential of machine-learning-based inference methods to constrain CP violation in the Higgs top-Yukawa coupling. This approach enables the use of the full available kinematic information. Concentrating on top-associated Higgs production with the Higgs decaying to two photons, we derive expected exclusion bounds for the LHC and the high-luminosity phase of the LHC. We also study the dependence of these bounds on the Higgs interaction with massive vector bosons and their robustness against theoretical uncertainties. In addition to deriving expected exclusion bounds, we discuss at which level a non-zero CP-violating top-Yukawa coupling can be distinguished from the SM. Moreover, we analyze which kinematic distributions are most sensitive to a CP-violating top-Yukawa coupling. |
1309.1955 | Wei-Min Yang | Wei-Min Yang | The Matter-Antimatter Asymmetry and Cold Dark Matter from The Left-Right
Mirror Symmetric Model with The Global $U(1)_{B-L}\otimes U(1)_{D}$ | 23 pages, 5 figures, the paper is revised and added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper suggests a left-right mirror symmetric model with the global
$U(1)_{B-L}\otimes U(1)_{D}$ symmetries. The model can simultaneously
accommodate the standard model, neutrino physics, matter-antimatter asymmetry
and cold dark matter. The model naturally and elegantly accounts for the origin
of the tiny neutrino mass, matter-antimatter asymmetry and cold dark matter. In
particular, it predicts a number of interesting results, e.g. a right-handed
neutrino asymmetry and a dark Goldstone boson. It is also feasible and
promising to test the model in future experiments.
| [
{
"created": "Sun, 8 Sep 2013 13:15:43 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2013 02:45:35 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Dec 2013 14:06:55 GMT",
"version": "v3"
},
{
"created": "Wed, 15 Jan 2014 01:27:49 GMT",
"version": "v4"
},
{
"crea... | 2014-03-05 | [
[
"Yang",
"Wei-Min",
""
]
] | The paper suggests a left-right mirror symmetric model with the global $U(1)_{B-L}\otimes U(1)_{D}$ symmetries. The model can simultaneously accommodate the standard model, neutrino physics, matter-antimatter asymmetry and cold dark matter. The model naturally and elegantly accounts for the origin of the tiny neutrino mass, matter-antimatter asymmetry and cold dark matter. In particular, it predicts a number of interesting results, e.g. a right-handed neutrino asymmetry and a dark Goldstone boson. It is also feasible and promising to test the model in future experiments. |
2302.05566 | Parada Hutauruk T. P. | Parada T. P. Hutauruk, Seung-il Nam | Updated analyses of gluon distribution functions for the pion and kaon
from the gauge-invariant nonlocal chiral quark model | 9 pages, 2 tables, 6 figures, REVTeX | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate the gluon distribution functions for the pion
and kaon, in addition to the improved result of the valence-quark ones, in the
gauge-invariant nonlocal chiral-quark model (NL$\chi$QM), in which the momentum
dependence of the quark interactions is properly taken into account. We then
analyze the gluon distribution functions, generated dynamically through the
splitting functions in the DGLAP QCD evolution. By comparing with the recent
lattice QCD results and JAM global analyses, it is found that the present
numerical results for the gluon parton distribution functions for the pion
exhibit a remarkable agreement, followed by the valence up-quark distribution
results for the pion by reproducing the reanalyzed experimental data. Our
prediction on the gluon distribution functions for the kaon is also consistent
with the recent lattice data for the kaon within the errors.
| [
{
"created": "Sat, 11 Feb 2023 02:01:46 GMT",
"version": "v1"
}
] | 2023-02-14 | [
[
"Hutauruk",
"Parada T. P.",
""
],
[
"Nam",
"Seung-il",
""
]
] | In this work, we investigate the gluon distribution functions for the pion and kaon, in addition to the improved result of the valence-quark ones, in the gauge-invariant nonlocal chiral-quark model (NL$\chi$QM), in which the momentum dependence of the quark interactions is properly taken into account. We then analyze the gluon distribution functions, generated dynamically through the splitting functions in the DGLAP QCD evolution. By comparing with the recent lattice QCD results and JAM global analyses, it is found that the present numerical results for the gluon parton distribution functions for the pion exhibit a remarkable agreement, followed by the valence up-quark distribution results for the pion by reproducing the reanalyzed experimental data. Our prediction on the gluon distribution functions for the kaon is also consistent with the recent lattice data for the kaon within the errors. |
hep-ph/9711364 | Erwin Mirkes | J.H. Kuehn and E. Mirkes | CP Violation from Charged Higgs Exchange in Hadronic Tau Decays with
Unpolarized Beams | Talk given by E. Mirkes at the International Europhysics Conference
on High-Energy Physics (HEP 97), Jerusalem, Israel, 19-26 Aug 1997. Latex, 4
pages. The complete paper, including figures, is also available via anonymous
ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ , or via www at
http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ | null | null | TTP97-48 | hep-ph | null | CP violating signals in semileptonic $\tau$ decays induced by an exotic
scalar exchange are studied in a completely model-independent way. These can be
observed in decays of unpolarized single $\tau$'s even if their rest frame
cannot be reconstructed. No beam polarization is required. The importance of
the two-meson channel, in particular the $K\pi$ final state is emphasized.
| [
{
"created": "Tue, 18 Nov 1997 09:59:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuehn",
"J. H.",
""
],
[
"Mirkes",
"E.",
""
]
] | CP violating signals in semileptonic $\tau$ decays induced by an exotic scalar exchange are studied in a completely model-independent way. These can be observed in decays of unpolarized single $\tau$'s even if their rest frame cannot be reconstructed. No beam polarization is required. The importance of the two-meson channel, in particular the $K\pi$ final state is emphasized. |
2405.03749 | Pavel Fileviez Perez | Jon Butterworth, Hridoy Debnath, Pavel Fileviez Perez, Yoran Yeh | Dark Matter from Anomaly Cancellation at the LHC | null | null | null | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a class of theories that predict a fermionic dark matter candidate
from gauge anomaly cancellation. As an explicit example, we study the
predictions in theories where the global symmetry associated with baryon number
is promoted to a local gauge symmetry. In this context the symmetry-breaking
scale has to be below the multi-TeV scale in order to be in agreement with the
cosmological constraints on the dark matter relic density. The new physical
"Cucuyo" Higgs boson in the theory has very interesting properties, decaying
mainly into two photons in the low mass region, and mainly into dark matter in
the intermediate mass region. We study the most important signatures at the
Large Hadron Collider, evaluating the experimental bounds. We discuss the
correlation between the dark matter relic density, direct detection and
collider constraints. We find that these theories are still viable, and are
susceptible to being probed in current, and future high-luminosity, running.
| [
{
"created": "Mon, 6 May 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-05-13 | [
[
"Butterworth",
"Jon",
""
],
[
"Debnath",
"Hridoy",
""
],
[
"Perez",
"Pavel Fileviez",
""
],
[
"Yeh",
"Yoran",
""
]
] | We discuss a class of theories that predict a fermionic dark matter candidate from gauge anomaly cancellation. As an explicit example, we study the predictions in theories where the global symmetry associated with baryon number is promoted to a local gauge symmetry. In this context the symmetry-breaking scale has to be below the multi-TeV scale in order to be in agreement with the cosmological constraints on the dark matter relic density. The new physical "Cucuyo" Higgs boson in the theory has very interesting properties, decaying mainly into two photons in the low mass region, and mainly into dark matter in the intermediate mass region. We study the most important signatures at the Large Hadron Collider, evaluating the experimental bounds. We discuss the correlation between the dark matter relic density, direct detection and collider constraints. We find that these theories are still viable, and are susceptible to being probed in current, and future high-luminosity, running. |
0706.1457 | Robi Peschanski | Guillaume Beuf, Robi Peschanski and Sebastian Sapeta | Universality of traveling waves with QCD running coupling | 4 pages, 3 figures,, Invited talk given at the DIS 2007 Conference,
Munich, Germany, April 2007; Change of title | null | 10.1103/PhysRevD.75.114001 | spht-07 | hep-ph | null | ``Geometric scaling'', i.e. the dependence of DIS cross-sections on the ratio
Q/Q_S, where Q_S(Y) is the rapidity-dependent \saturation scale, can be
theoretically obtained from universal ``traveling wave'' solutions of the
nonlinear Balitsky-Kovchegov (BK) QCD evolution equation at fixed coupling. We
examine the similar mean-field predictions beyond leading-logarithmic order,
including running QCD coupling.
| [
{
"created": "Mon, 11 Jun 2007 12:24:11 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2007 12:15:20 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Beuf",
"Guillaume",
""
],
[
"Peschanski",
"Robi",
""
],
[
"Sapeta",
"Sebastian",
""
]
] | ``Geometric scaling'', i.e. the dependence of DIS cross-sections on the ratio Q/Q_S, where Q_S(Y) is the rapidity-dependent \saturation scale, can be theoretically obtained from universal ``traveling wave'' solutions of the nonlinear Balitsky-Kovchegov (BK) QCD evolution equation at fixed coupling. We examine the similar mean-field predictions beyond leading-logarithmic order, including running QCD coupling. |
1505.00134 | Po-Yan Tseng | Yu-Heng Chen, Kingman Cheung, and Po-Yan Tseng | Dark Matter with multi-annihilation channels and AMS-02 positron excess
and antiproton | 25 pages, 11 figures | null | 10.1103/PhysRevD.93.015015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | AMS-02 provided the unprecedented statistics in the measurement of the
positron fraction from cosmic rays. That may offer a unique opportunity to
distinguish the positron spectrum coming from various dark matter (DM)
annihilation channels, if DM is the source of this positron excess. Therefore,
we consider the scenario that the DM can annihilate into leptonic, quark, and
massive gauge boson channels simultaneously with floating branching ratios to
test this hypothesis. We also study the impacts from MAX, MED, MIN, and DC
diffusion models as well as from isothermal, NFW, and Einasto DM density
profiles on our results. We found two parameter regions that can satisfy both
AMS-02 $\frac{e^+}{e^++e^-}$ and $\bar{p}/p$ datasets at 95\% CL. i) Under the
NFW-MIN combination with $M_{\chi}\subset[10,30]$ TeV. ii) Under the Einasto-DC
combination with $M_{\chi}\subset[500,1500]$ GeV.
| [
{
"created": "Fri, 1 May 2015 09:46:49 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2016 08:24:01 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Chen",
"Yu-Heng",
""
],
[
"Cheung",
"Kingman",
""
],
[
"Tseng",
"Po-Yan",
""
]
] | AMS-02 provided the unprecedented statistics in the measurement of the positron fraction from cosmic rays. That may offer a unique opportunity to distinguish the positron spectrum coming from various dark matter (DM) annihilation channels, if DM is the source of this positron excess. Therefore, we consider the scenario that the DM can annihilate into leptonic, quark, and massive gauge boson channels simultaneously with floating branching ratios to test this hypothesis. We also study the impacts from MAX, MED, MIN, and DC diffusion models as well as from isothermal, NFW, and Einasto DM density profiles on our results. We found two parameter regions that can satisfy both AMS-02 $\frac{e^+}{e^++e^-}$ and $\bar{p}/p$ datasets at 95\% CL. i) Under the NFW-MIN combination with $M_{\chi}\subset[10,30]$ TeV. ii) Under the Einasto-DC combination with $M_{\chi}\subset[500,1500]$ GeV. |
1309.5015 | Chong Sheng Li | Ding Yu Shao, Chong Sheng Li and Hai Tao Li | Resummation Prediction on Higgs and Vector Boson Associated Production
with a Jet Veto at the LHC | 22 pages, 10 figures and 2 tables; final version in JHEP | JHEP02(2014)117 | 10.1007/JHEP02(2014)117 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the resummation effects for the SM Higgs and vector boson
associated production at the LHC with a jet veto in soft-collinear effective
theory using "collinear anomalous" formalism. We calculate the jet vetoed
invariant mass distribution and the cross section for this process at
Next-to-Next-to-Leading-Logarithmic level, which are matched to the QCD
Next-to-Leading Order results, and compare the differences of the resummation
effects with different jet veto $p_{T}^{\rm veto}$ and jet radius $R$. Our
results show that both resummation enhancement effects and the scale
uncertainties decrease with the increasing of jet veto $p_{T}^{\rm veto}$ and
jet radius $R$, respectively. When $p_{T}^{\rm veto}=25$ GeV and $R=0.4~(0.5)$,
the resummation effects reduce the scale uncertainties of the Next-to-Leading
Order jet vetoed cross sections to about $7\%~(6\%)$, which lead to increased
confidence on the theoretical predictions. Besides, after including resummation
effects, the PDF uncertainties of jet vetoed cross section are about $7\%$.
| [
{
"created": "Thu, 19 Sep 2013 15:19:40 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Mar 2014 06:00:57 GMT",
"version": "v2"
}
] | 2014-03-04 | [
[
"Shao",
"Ding Yu",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Li",
"Hai Tao",
""
]
] | We investigate the resummation effects for the SM Higgs and vector boson associated production at the LHC with a jet veto in soft-collinear effective theory using "collinear anomalous" formalism. We calculate the jet vetoed invariant mass distribution and the cross section for this process at Next-to-Next-to-Leading-Logarithmic level, which are matched to the QCD Next-to-Leading Order results, and compare the differences of the resummation effects with different jet veto $p_{T}^{\rm veto}$ and jet radius $R$. Our results show that both resummation enhancement effects and the scale uncertainties decrease with the increasing of jet veto $p_{T}^{\rm veto}$ and jet radius $R$, respectively. When $p_{T}^{\rm veto}=25$ GeV and $R=0.4~(0.5)$, the resummation effects reduce the scale uncertainties of the Next-to-Leading Order jet vetoed cross sections to about $7\%~(6\%)$, which lead to increased confidence on the theoretical predictions. Besides, after including resummation effects, the PDF uncertainties of jet vetoed cross section are about $7\%$. |
1002.1134 | Sunando Patra | Anirban Kundu, Soumitra Nandi, Sunando Kumar Patra | Probing CPT Violation in B Systems | 14 pages, 5 encapsulated postscript figures. Some typographical
errors corrected | Phys.Rev.D81:076010,2010 | 10.1103/PhysRevD.81.076010 | CU-PHYSICS/1-2010 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how a possible violation of the combined symmetry CPT in the B
meson system can be investigated at the LHC. We show how a tagged and an
untagged analysis of the decay modes of both B(d) and B(s) mesons can lead not
only to a possible detection of a CPT-violating new physics but also to an
understanding of its precise nature. The implication of CPT violation to a
large mixing phase in the B(s) system is also discussed.
| [
{
"created": "Fri, 5 Feb 2010 06:19:51 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Feb 2010 07:29:44 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Apr 2010 17:28:26 GMT",
"version": "v3"
},
{
"created": "Mon, 6 May 2013 09:02:08 GMT",
"version": "v4"
}
] | 2013-05-07 | [
[
"Kundu",
"Anirban",
""
],
[
"Nandi",
"Soumitra",
""
],
[
"Patra",
"Sunando Kumar",
""
]
] | We discuss how a possible violation of the combined symmetry CPT in the B meson system can be investigated at the LHC. We show how a tagged and an untagged analysis of the decay modes of both B(d) and B(s) mesons can lead not only to a possible detection of a CPT-violating new physics but also to an understanding of its precise nature. The implication of CPT violation to a large mixing phase in the B(s) system is also discussed. |
0707.2320 | Francois Arleo | Francois Arleo | Prompt photons in heavy ion collisions at the LHC: A ''multi-purpose''
observable | 2 pages, 2 figures. Presented at the Workshop on Heavy Ion Collisions
at the LHC: Last Call for Predictions, CERN, 14 May-8 Jun 2007 | null | null | CERN-PH-TH/2007-11, LAPTH-1197/07 | hep-ph nucl-ex nucl-th | null | I emphasize in this contribution how prompt photons can be used to probe
nuclear parton densities as well as medium-modified fragmentation functions in
heavy ion collisions. Various predictions in p-A and A-A collisions at LHC
energies are given.
| [
{
"created": "Mon, 16 Jul 2007 13:41:00 GMT",
"version": "v1"
}
] | 2007-07-18 | [
[
"Arleo",
"Francois",
""
]
] | I emphasize in this contribution how prompt photons can be used to probe nuclear parton densities as well as medium-modified fragmentation functions in heavy ion collisions. Various predictions in p-A and A-A collisions at LHC energies are given. |
1410.4782 | Jie Lu | Johan Bijnens, Jie Lu | Effective Theories for QCD-like at TeV Scale | 7 pages, 2 figures, Contribution to the proceedings of the ICHEP 2014
conference, Valencia, Spain | null | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Effective Field Theory of three QCD-like theories, which can be
classified by having quarks in a complex, real or pseudo-real representations
of the gauge group. The Lagrangians are written in a very similar way so that
the calculations can be done using techniques from Chiral Perturbation Theory
(ChPT). We calculated the vacuum-expectation-value, the mass and the decay
constant of pseudo-Goldstone Bosons up to next-to-next-to leading order (NNLO)
\cite{Bijnens:2009qm}. The various channels of general $n$ flavour meson-meson
scattering of the three theories are systematically studied and calculated up
to NNLO \cite{Bijnens:2011fm}. We also calculated the vector, axial-vector,
scalar, pseudo-scalar two-point functions and pseudo-scalar decay constant up
NNLO order \cite{Bijnens:2011xt}. The analytic expressions of the S parameter
for the three different QCD-like theories are obtained at TeV scale. Our
results are useful for chiral extrapolation in lattice calculation on theory of
strong dynamical and finite baryon density.
| [
{
"created": "Fri, 17 Oct 2014 16:08:47 GMT",
"version": "v1"
}
] | 2014-10-20 | [
[
"Bijnens",
"Johan",
""
],
[
"Lu",
"Jie",
""
]
] | We study the Effective Field Theory of three QCD-like theories, which can be classified by having quarks in a complex, real or pseudo-real representations of the gauge group. The Lagrangians are written in a very similar way so that the calculations can be done using techniques from Chiral Perturbation Theory (ChPT). We calculated the vacuum-expectation-value, the mass and the decay constant of pseudo-Goldstone Bosons up to next-to-next-to leading order (NNLO) \cite{Bijnens:2009qm}. The various channels of general $n$ flavour meson-meson scattering of the three theories are systematically studied and calculated up to NNLO \cite{Bijnens:2011fm}. We also calculated the vector, axial-vector, scalar, pseudo-scalar two-point functions and pseudo-scalar decay constant up NNLO order \cite{Bijnens:2011xt}. The analytic expressions of the S parameter for the three different QCD-like theories are obtained at TeV scale. Our results are useful for chiral extrapolation in lattice calculation on theory of strong dynamical and finite baryon density. |
1103.5757 | Nuno Barros | N. F. de Barros, K. Zuber | Solar neutrino-electron scattering as background limitation for double
beta decay | null | J.Phys.G38:105201,2011 | 10.1088/0954-3899/38/10/105201 | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The background on double beta decay searches due to elastic electron
scattering of solar neutrinos of all double beta emitters with Q-value larger
than 2 MeV is calculated, taking into account survival probability and flux
uncertainties of solar neutrinos. This work determines the background level to
be [1-2]E-7 counts /keV/kg/yr, depending on the precise Q-value of the double
beta emitter. It is also shown that the background level increases dramatically
if going to lower Q-values. Furthermore, studies are done for various detector
systems under consideration for next generation experiments. It was found that
experiments based on loaded liquid scintillator have to expect a higher
background. Within the given nuclear matrix element uncertainties any approach
exploring the normal hierarchy has to face this irreducible background, which
is a limitation on the minimal achievable background for purely calorimetric
approaches. Large scale liquid scintillator experiments might encounter this
problem already while exploring the inverted hierarchy. Potential caveats by
using more sophisticated experimental setups are also discussed.
| [
{
"created": "Tue, 29 Mar 2011 20:04:36 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Sep 2011 15:55:03 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"de Barros",
"N. F.",
""
],
[
"Zuber",
"K.",
""
]
] | The background on double beta decay searches due to elastic electron scattering of solar neutrinos of all double beta emitters with Q-value larger than 2 MeV is calculated, taking into account survival probability and flux uncertainties of solar neutrinos. This work determines the background level to be [1-2]E-7 counts /keV/kg/yr, depending on the precise Q-value of the double beta emitter. It is also shown that the background level increases dramatically if going to lower Q-values. Furthermore, studies are done for various detector systems under consideration for next generation experiments. It was found that experiments based on loaded liquid scintillator have to expect a higher background. Within the given nuclear matrix element uncertainties any approach exploring the normal hierarchy has to face this irreducible background, which is a limitation on the minimal achievable background for purely calorimetric approaches. Large scale liquid scintillator experiments might encounter this problem already while exploring the inverted hierarchy. Potential caveats by using more sophisticated experimental setups are also discussed. |
hep-ph/9906349 | David John Summers | C.G.Lester and D.J.Summers (Cavendish, Cambridge) | Measuring masses of semi-invisibly decaying particles pair produced at
hadron colliders | 8 pages, 3 figures, LaTeX | Phys.Lett.B463:99-103,1999 | 10.1016/S0370-2693(99)00945-4 | Cavendish-HEP-99/07 | hep-ph hep-ex | null | We introduce a variable useful for measuring masses of particles pair
produced at hadron colliders, where each particle decays to one particle that
is directly observable and another particle whose existence can only be
inferred from missing transverse momenta. This variable is closely related to
the transverse mass variable commonly used for measuring the $W$ mass at hadron
colliders, and like the transverse mass our variable extracts masses in a
reasonably model independent way. Without considering either backgrounds or
measurement errors we consider how our variable would perform measuring the
mass of selectrons in a mSUGRA SUSY model at the LHC.
| [
{
"created": "Sat, 12 Jun 1999 18:23:58 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Lester",
"C. G.",
"",
"Cavendish, Cambridge"
],
[
"Summers",
"D. J.",
"",
"Cavendish, Cambridge"
]
] | We introduce a variable useful for measuring masses of particles pair produced at hadron colliders, where each particle decays to one particle that is directly observable and another particle whose existence can only be inferred from missing transverse momenta. This variable is closely related to the transverse mass variable commonly used for measuring the $W$ mass at hadron colliders, and like the transverse mass our variable extracts masses in a reasonably model independent way. Without considering either backgrounds or measurement errors we consider how our variable would perform measuring the mass of selectrons in a mSUGRA SUSY model at the LHC. |
hep-ph/9504282 | Bernard Pire | Bernard PIRE | Exclusive Scattering at ELFE | 18 pages , LATEX , figures available upon request | null | null | null | hep-ph | null | The theoretical framework of hard exclusive reactions is reviewed with
special emphasis on the Elfe project program. Perturbative QCD studies have
shown that factorization properties allow to separate well-defined non
perturbative objects which are crucial in the understanding of confinement
dynamics from perturbatively calculable hard processes. The applicability of
this factorization in a definite energy domain is controlled by some definite
statements, as the dimensional counting rules, the helicity conservation law
and the appearance of color transparency. The few data available indicate that
the Elfe parameters indeed correspond to this well defined physics.
| [
{
"created": "Tue, 11 Apr 1995 14:10:38 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"PIRE",
"Bernard",
""
]
] | The theoretical framework of hard exclusive reactions is reviewed with special emphasis on the Elfe project program. Perturbative QCD studies have shown that factorization properties allow to separate well-defined non perturbative objects which are crucial in the understanding of confinement dynamics from perturbatively calculable hard processes. The applicability of this factorization in a definite energy domain is controlled by some definite statements, as the dimensional counting rules, the helicity conservation law and the appearance of color transparency. The few data available indicate that the Elfe parameters indeed correspond to this well defined physics. |
hep-ph/9402311 | Naoya Hata | Naoya Hata | Vacuum Oscillations and Future Solar Neutrino Experiments | (Revtex 3.0, 19 pages + 8 figures (uuencoded ps files attached), Easy
way: ps file of entire text with embedded figures available by anonymous ftp
at upenn5.hep.upenn.edu, get vacuum.uu in pub/hata/papers/, UPR-0605T) | null | null | null | hep-ph astro-ph | null | Vacuum oscillations are considered for the combined solar neutrino
observations, including the Kamiokande II spectrum data and incorporating
theoretical uncertainties and their correlations. Despite the conceptual
difficulty of the fine tuning between the neutrino parameters and the Sun-Earth
distance, 2-flavor vacuum oscillations provide phenomenologically acceptable
solutions. There are allowed regions at 99\% C.L. for $\Delta m^2 = (0.45 -
1.2) \times 10^{-10} \; \mbox{eV}\,^2$ and $\sin^22\theta = 0.6 - 1$; the best
fit solution is $\chi^2 / \mbox{d.f.} = 19.2 / 16$, which is acceptable at 16\%
C.L. Oscillations for sterile neutrinos are, however, excluded by the averaged
data at 99.4\% C.L. The vacuum oscillation solutions predict characteristic
energy spectrum distortions and seasonal variations in Sudbury Neutrino
Observatory, Super-Kamiokande, and BOREXINO. Those predictions are given in
detail, emphasizing that the vacuum solutions are distinguishable from the MSW
solutions.
| [
{
"created": "Thu, 17 Feb 1994 22:05:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hata",
"Naoya",
""
]
] | Vacuum oscillations are considered for the combined solar neutrino observations, including the Kamiokande II spectrum data and incorporating theoretical uncertainties and their correlations. Despite the conceptual difficulty of the fine tuning between the neutrino parameters and the Sun-Earth distance, 2-flavor vacuum oscillations provide phenomenologically acceptable solutions. There are allowed regions at 99\% C.L. for $\Delta m^2 = (0.45 - 1.2) \times 10^{-10} \; \mbox{eV}\,^2$ and $\sin^22\theta = 0.6 - 1$; the best fit solution is $\chi^2 / \mbox{d.f.} = 19.2 / 16$, which is acceptable at 16\% C.L. Oscillations for sterile neutrinos are, however, excluded by the averaged data at 99.4\% C.L. The vacuum oscillation solutions predict characteristic energy spectrum distortions and seasonal variations in Sudbury Neutrino Observatory, Super-Kamiokande, and BOREXINO. Those predictions are given in detail, emphasizing that the vacuum solutions are distinguishable from the MSW solutions. |
hep-ph/0103160 | Alfonso R. Zerwekh | Alfonso R. Zerwekh | New Limits on the Color-Octet Technirho Mass from its Decay to Dijets | 8 pages. Submitted to Physics Letters B | null | null | USM-TH-103 | hep-ph | null | Recently has been shown that the physical (mass eigenstate) color-octet
technirho does not couple to two gluons. In this letter we study how this
result affects the presently accepted limits for the color-octet technirho mass
obtained from the study of dijets production at the Tevatron. First we show
that data from Tevatron Run 1b can not exclude any mass range. Finally, we
obtain limits for the Tevatron Run II.
| [
{
"created": "Wed, 14 Mar 2001 15:01:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zerwekh",
"Alfonso R.",
""
]
] | Recently has been shown that the physical (mass eigenstate) color-octet technirho does not couple to two gluons. In this letter we study how this result affects the presently accepted limits for the color-octet technirho mass obtained from the study of dijets production at the Tevatron. First we show that data from Tevatron Run 1b can not exclude any mass range. Finally, we obtain limits for the Tevatron Run II. |
1705.03229 | Guo-Liang Yu | Guo Liang Yu, Zhi Gang Wang, Zhen Yu Li | Analysis of the strong vertexes of $\Sigma_c^{*} ND$ and
$\Sigma_b^{*}NB$ in QCD sum rules | null | Int. J. Mod. Phys. A 32, 1750203 (2017) | 10.1142/S0217751X17502037 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we analyze the strong vertexes $\Sigma_{c}^{*}ND$ and
$\Sigma_{b}^{*}NB$ using the three-point QCD sum rules under the Dirac
structure of $q\!\!\!/p\!\!\!/\gamma_{\mu}$. We perform our analysis by
considering the contributions of the perturbative part and the condensate terms
of $<\overline{q}q>$ and $<\frac{\alpha_{s}}{\pi}GG>$. After the form factors
are calculated, they are then fitted into analytical functions which are used
to get the strong coupling constants for these two vertexes. The final results
are $g_{\Sigma_{c}^{*}ND}=7.19^{+8.49}_{-3.11}\pm1.76$ and
$g_{\Sigma_{b}^{*}NB}=10.54^{+15.59}_{-5.23}\pm1.82$.
| [
{
"created": "Tue, 9 May 2017 08:41:37 GMT",
"version": "v1"
}
] | 2017-12-25 | [
[
"Yu",
"Guo Liang",
""
],
[
"Wang",
"Zhi Gang",
""
],
[
"Li",
"Zhen Yu",
""
]
] | In this article, we analyze the strong vertexes $\Sigma_{c}^{*}ND$ and $\Sigma_{b}^{*}NB$ using the three-point QCD sum rules under the Dirac structure of $q\!\!\!/p\!\!\!/\gamma_{\mu}$. We perform our analysis by considering the contributions of the perturbative part and the condensate terms of $<\overline{q}q>$ and $<\frac{\alpha_{s}}{\pi}GG>$. After the form factors are calculated, they are then fitted into analytical functions which are used to get the strong coupling constants for these two vertexes. The final results are $g_{\Sigma_{c}^{*}ND}=7.19^{+8.49}_{-3.11}\pm1.76$ and $g_{\Sigma_{b}^{*}NB}=10.54^{+15.59}_{-5.23}\pm1.82$. |
hep-ph/9806403 | Per Elmfors | Per Elmfors, Kari Enqvist, Kimmo Kainulainen | Strongly first order electroweak phase transition induced by primordial
hypermagnetic fields | 11 pages, 1 ps figure. Minor corrections in the published version | Phys.Lett.B440:269-274,1998 | 10.1016/S0370-2693(98)01117-4 | HIP-1998-31/TH, NORDITA-98/45 HE, SUITP-98-10 | hep-ph astro-ph hep-th | null | We consider the effect of the presence of a hypermagnetic field at the
electroweak phase transition. Screening of the Z-component inside a bubble of
the broken phase delays the phase transition and makes it stronger first order.
We show that the sphaleron constraint can be evaded for m_H up to 100 GeV if a
B_Y\gsim 0.3 T^2 exists at the time of the EW phase transition, thus
resurrecting the possibility for baryogenesis within the minimal standard model
(provided enough CP violation can be obtained). We estimate that for m_H\gsim
100 GeV the Higgs condendsate behaves like a type II superconductor with
Z-vortices penetrating the bubble. Also, for such high Higgs masses the minimum
B_Y field required for a strong first order phase transition is large enough to
render the W-field unstable towards forming a condensate which changes the
simple picture of the symmetry breaking.
| [
{
"created": "Thu, 18 Jun 1998 11:44:45 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 1998 09:39:45 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Elmfors",
"Per",
""
],
[
"Enqvist",
"Kari",
""
],
[
"Kainulainen",
"Kimmo",
""
]
] | We consider the effect of the presence of a hypermagnetic field at the electroweak phase transition. Screening of the Z-component inside a bubble of the broken phase delays the phase transition and makes it stronger first order. We show that the sphaleron constraint can be evaded for m_H up to 100 GeV if a B_Y\gsim 0.3 T^2 exists at the time of the EW phase transition, thus resurrecting the possibility for baryogenesis within the minimal standard model (provided enough CP violation can be obtained). We estimate that for m_H\gsim 100 GeV the Higgs condendsate behaves like a type II superconductor with Z-vortices penetrating the bubble. Also, for such high Higgs masses the minimum B_Y field required for a strong first order phase transition is large enough to render the W-field unstable towards forming a condensate which changes the simple picture of the symmetry breaking. |
1111.4176 | Kiel Howe | Peter W. Graham, Kiel Howe, Surjeet Rajendran, Daniel Stolarski | New Measurements with Stopped Particles at the LHC | 31 pages, 6 figures. References added, updated to reflect recent
experimental results, version accepted for publication in Physical Review D | null | 10.1103/PhysRevD.86.034020 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metastable particles are common in many models of new physics at the TeV
scale. If charged or colored, a reasonable fraction of all such particles
produced at the LHC will stop in the detectors and give observable out of time
decays. We demonstrate that significant information may be learned from such
decays about the properties (e.g. charge or spin) of this particle and of any
other particles to which it decays, for example a dark matter candidate. We
discuss strategies for measuring the type of decay (two- vs three-body), the
types of particles produced, and the angular distribution of the produced
particles using the LHC detectors. We demonstrate that with O(10-100) observed
decay events, not only can the properties of the new particles be measured but
indeed even the Lorentz structure of the decay operator can be distinguished in
the case of three-body decays. These measurements can not only reveal the
correct model of new physics at the TeV scale, but also give information on
physics giving rise to the decay at energy scales far above those the LHC can
probe directly.
| [
{
"created": "Thu, 17 Nov 2011 18:55:12 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2012 19:40:05 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Graham",
"Peter W.",
""
],
[
"Howe",
"Kiel",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Stolarski",
"Daniel",
""
]
] | Metastable particles are common in many models of new physics at the TeV scale. If charged or colored, a reasonable fraction of all such particles produced at the LHC will stop in the detectors and give observable out of time decays. We demonstrate that significant information may be learned from such decays about the properties (e.g. charge or spin) of this particle and of any other particles to which it decays, for example a dark matter candidate. We discuss strategies for measuring the type of decay (two- vs three-body), the types of particles produced, and the angular distribution of the produced particles using the LHC detectors. We demonstrate that with O(10-100) observed decay events, not only can the properties of the new particles be measured but indeed even the Lorentz structure of the decay operator can be distinguished in the case of three-body decays. These measurements can not only reveal the correct model of new physics at the TeV scale, but also give information on physics giving rise to the decay at energy scales far above those the LHC can probe directly. |
2306.09508 | Michael Andreas Schmidt | Maksym Ovchynnikov, Michael A. Schmidt, Thomas Schwetz | Complementarity of $B\to K^{(*)} \mu \bar \mu$ and $B\to K^{(*)} +
\mathrm{inv}$ for searches of GeV-scale Higgs-like scalars | 18 pages, 6 figures, corrected factor 2 in Eq (28) and Figs 3-5, main
conclusions unchanged, matches version accepted by EPJC | null | null | CPPC-2023-02 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The rare decays $B^+\to K^+ \mu\bar \mu$ and $B^0\to K^{*0} \mu\bar\mu$
provide the strongest constraints on the mixing of a light scalar with the
Higgs boson for GeV-scale masses. The constraints sensitively depend on the
branching ratio to muons. Additional decay channels like an invisible partial
width may substantially weaken the constraints. This scenario will be probed at
Belle II in $B\to K^{(*)} + \mathrm{inv}$. We illustrate the complementarity of
scalar decays to muons and invisible decays using the currently available
results of LHCb and BaBar. We provide two simple model realisations providing a
sizeable invisible scalar width, one based on a real scalar and one based on a
$U(1)_{B-L}$ gauge symmetry. In both examples the scalar decays into heavy
neutral leptons which can be motivated by the seesaw mechanism for neutrino
masses.
| [
{
"created": "Thu, 15 Jun 2023 21:04:55 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2023 07:59:01 GMT",
"version": "v2"
}
] | 2023-09-07 | [
[
"Ovchynnikov",
"Maksym",
""
],
[
"Schmidt",
"Michael A.",
""
],
[
"Schwetz",
"Thomas",
""
]
] | The rare decays $B^+\to K^+ \mu\bar \mu$ and $B^0\to K^{*0} \mu\bar\mu$ provide the strongest constraints on the mixing of a light scalar with the Higgs boson for GeV-scale masses. The constraints sensitively depend on the branching ratio to muons. Additional decay channels like an invisible partial width may substantially weaken the constraints. This scenario will be probed at Belle II in $B\to K^{(*)} + \mathrm{inv}$. We illustrate the complementarity of scalar decays to muons and invisible decays using the currently available results of LHCb and BaBar. We provide two simple model realisations providing a sizeable invisible scalar width, one based on a real scalar and one based on a $U(1)_{B-L}$ gauge symmetry. In both examples the scalar decays into heavy neutral leptons which can be motivated by the seesaw mechanism for neutrino masses. |
1312.6419 | Anton Ilderton | Victor Dinu, Tom Heinzl, Anton Ilderton, Mattias Marklund and Greger
Torgrimsson | Vacuum refractive indices and helicity flip in strong-field QED | Version 2: additional results added, including discussion of vacuum
refractive indices, analysis of flip and non-flip ampltidues at high-energy,
additional plots, new title. Now 17 pages, 10 figures | Phys. Rev. D 89, 125003 (2014) | 10.1103/PhysRevD.89.125003 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vacuum birefringence is governed by the amplitude for a photon to flip
helicity or polarisation state in an external field. Here we calculate the flip
and non-flip amplitudes in arbitrary plane wave backgrounds, along with the
induced spacetime-dependent refractive indices of the vacuum. We compare the
behaviour of the amplitudes in the low energy and high energy regimes, and
analyse the impact of pulse shape and energy. We also provide the first
lightfront-QED derivation of the coefficients in the Heisenberg-Euler effective
action.
| [
{
"created": "Sun, 22 Dec 2013 20:21:35 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2014 13:04:31 GMT",
"version": "v2"
}
] | 2014-06-11 | [
[
"Dinu",
"Victor",
""
],
[
"Heinzl",
"Tom",
""
],
[
"Ilderton",
"Anton",
""
],
[
"Marklund",
"Mattias",
""
],
[
"Torgrimsson",
"Greger",
""
]
] | Vacuum birefringence is governed by the amplitude for a photon to flip helicity or polarisation state in an external field. Here we calculate the flip and non-flip amplitudes in arbitrary plane wave backgrounds, along with the induced spacetime-dependent refractive indices of the vacuum. We compare the behaviour of the amplitudes in the low energy and high energy regimes, and analyse the impact of pulse shape and energy. We also provide the first lightfront-QED derivation of the coefficients in the Heisenberg-Euler effective action. |
1407.6695 | Hee Sok Chung | Geoffrey T. Bodwin, Hee Sok Chung (Argonne), June-Haak Ee, Jungil Lee
(Korea U.), Frank Petriello (Argonne and Northwestern U.) | Relativistic corrections to Higgs boson decays to quarkonia | 24 pages, 2 figures, minor revisions, version published in PRD | Phys. Rev. D 90, 113010 (2014) | 10.1103/PhysRevD.90.113010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We improve the theoretical predictions for the decays of the Higgs boson to
an $S$-wave vector quarkonium plus a photon by calculating the relativistic
correction of order $v^2$, where $v$ is the heavy-quark velocity in the
quarkonium rest frame. Our numerical results are given for the $J/\psi$ and
$\Upsilon(nS)$ channels, with $n=1,2,3$. The numerical results include a
previously calculated correction of order $\alpha_s$ and summations, to all
orders in $\alpha_s$, of leading logarithms of $m_H^2/m_Q^2$, where $m_H$ is
the Higgs-boson mass and $m_Q$ is the heavy-quark mass. These QCD corrections
apply to the contribution of leading order in $v$ and to part of the
order-$v^2$ correction. For the remainder of the order-$v^2$ correction, we sum
leading logarithms of $m_H/m_Q$ through order $\alpha_s^2$. These refinements
reduce the theoretical uncertainties in the direct-production amplitudes for $H
\to J/\psi+\gamma$ and $H \to \Upsilon(1S)+\gamma$ by approximately a factor of
3 and open the door to improved determinations at the LHC of the Higgs-boson
Yukawa couplings to the charm and bottom quarks.
| [
{
"created": "Thu, 24 Jul 2014 19:12:04 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2014 23:32:13 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Dec 2014 22:38:04 GMT",
"version": "v3"
}
] | 2014-12-23 | [
[
"Bodwin",
"Geoffrey T.",
"",
"Argonne"
],
[
"Chung",
"Hee Sok",
"",
"Argonne"
],
[
"Ee",
"June-Haak",
"",
"Korea U."
],
[
"Lee",
"Jungil",
"",
"Korea U."
],
[
"Petriello",
"Frank",
"",
"Argonne and Northwestern U."
]... | We improve the theoretical predictions for the decays of the Higgs boson to an $S$-wave vector quarkonium plus a photon by calculating the relativistic correction of order $v^2$, where $v$ is the heavy-quark velocity in the quarkonium rest frame. Our numerical results are given for the $J/\psi$ and $\Upsilon(nS)$ channels, with $n=1,2,3$. The numerical results include a previously calculated correction of order $\alpha_s$ and summations, to all orders in $\alpha_s$, of leading logarithms of $m_H^2/m_Q^2$, where $m_H$ is the Higgs-boson mass and $m_Q$ is the heavy-quark mass. These QCD corrections apply to the contribution of leading order in $v$ and to part of the order-$v^2$ correction. For the remainder of the order-$v^2$ correction, we sum leading logarithms of $m_H/m_Q$ through order $\alpha_s^2$. These refinements reduce the theoretical uncertainties in the direct-production amplitudes for $H \to J/\psi+\gamma$ and $H \to \Upsilon(1S)+\gamma$ by approximately a factor of 3 and open the door to improved determinations at the LHC of the Higgs-boson Yukawa couplings to the charm and bottom quarks. |
hep-ph/9803443 | Petr Zavada | P.Zavada | Nucleon spin structure and mass of quarks | 27 pages, Tex, 7 PostSript figures. Revised version contains more
detailed explanation of some steps. The Fig.6 is replaced by corrected
version. Minor modifications in the text and the reference list | null | null | null | hep-ph | null | The alternative to the standard formulation of the quark-parton model is
proposed. Our relativistically covariant approach is based on the solution of
the master equations relating the structure and distribution functions, which
consistently takes into account the intrinsic quark motion - in
contradistinction to the standard infinite momentum approach, in which this
motion is latently suppressed. The model well reproduces the experimental data
on the both polarized and unpolarized structure functions, assuming that only
the valence quarks term contributes to the nucleon spin. It is shown, the
combined analysis of the polarized and unpolarized data can give an information
about the effective masses and intrinsic motion of the quarks inside the
nucleon. Simultaneously, it is shown that the rate of the nucleon energy
carried by the quarks can be less, than estimated from the standard approach.
As an addition, a prediction for the proton spin function $g_2$ is given.
| [
{
"created": "Wed, 25 Mar 1998 12:35:29 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 1998 08:45:43 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Jun 1999 09:43:48 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Zavada",
"P.",
""
]
] | The alternative to the standard formulation of the quark-parton model is proposed. Our relativistically covariant approach is based on the solution of the master equations relating the structure and distribution functions, which consistently takes into account the intrinsic quark motion - in contradistinction to the standard infinite momentum approach, in which this motion is latently suppressed. The model well reproduces the experimental data on the both polarized and unpolarized structure functions, assuming that only the valence quarks term contributes to the nucleon spin. It is shown, the combined analysis of the polarized and unpolarized data can give an information about the effective masses and intrinsic motion of the quarks inside the nucleon. Simultaneously, it is shown that the rate of the nucleon energy carried by the quarks can be less, than estimated from the standard approach. As an addition, a prediction for the proton spin function $g_2$ is given. |
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