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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9703349 | Tobias Hurth | Christoph Greub (DESY), Tobias Hurth (SUNY at Stony Brook) | Two-loop matching of the dipole operators for $b \to s \gamma$ and $b
\to s gluon$ | 24 pages, latex, 6 figures included | Phys.Rev.D56:2934-2949,1997 | 10.1103/PhysRevD.56.2934 | DESY 97-040, ITB-SB-97-18 | hep-ph | null | The order $\alpha_s$ corrections to the Wilson coefficients of the dipole
operators ($O_7,O_8$) at the matching scale $\mu =m_W$ are a crucial ingredient
for a complete next- to-leading logarithmic calculation of the branching ratio
for $b \to s \gamma$. Given the phenomenological relevance and the fact that
this two-loop calculation has been done so far only by one group [1], we
present a detailed re-calculation using a different method. Our results are in
complete agreement with those in ref. [1].
| [
{
"created": "Tue, 18 Mar 1997 04:56:49 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Greub",
"Christoph",
"",
"DESY"
],
[
"Hurth",
"Tobias",
"",
"SUNY at Stony Brook"
]
] | The order $\alpha_s$ corrections to the Wilson coefficients of the dipole operators ($O_7,O_8$) at the matching scale $\mu =m_W$ are a crucial ingredient for a complete next- to-leading logarithmic calculation of the branching ratio for $b \to s \gamma$. Given the phenomenological relevance and the fact that this two-loop calculation has been done so far only by one group [1], we present a detailed re-calculation using a different method. Our results are in complete agreement with those in ref. [1]. |
hep-ph/0012091 | Boris Kopeliovich | B.Z. Kopeliovich (Heidelberg), T.L. Trueman (Brookhaven) | Polarized Proton Nucleus Scattering | Latex, 22 pages including 7 figures | Phys.Rev.D64:034004,2001 | 10.1103/PhysRevD.64.034004 | null | hep-ph nucl-th | null | We show that, to a very good approximation, the ratio of the spin-flip to the
non-flip parts of the elastic proton-nucleus amplitude is the same as for
proton-nucleon scattering at very high energy. The result is used to do a
realistic calculation of the analyzing power A_N for pC scattering in the
Coulomb-nuclear interference (CNI) region of momentum transfer.
| [
{
"created": "Thu, 7 Dec 2000 22:46:53 GMT",
"version": "v1"
},
{
"created": "Mon, 28 May 2001 18:12:29 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Kopeliovich",
"B. Z.",
"",
"Heidelberg"
],
[
"Trueman",
"T. L.",
"",
"Brookhaven"
]
] | We show that, to a very good approximation, the ratio of the spin-flip to the non-flip parts of the elastic proton-nucleus amplitude is the same as for proton-nucleon scattering at very high energy. The result is used to do a realistic calculation of the analyzing power A_N for pC scattering in the Coulomb-nuclear interference (CNI) region of momentum transfer. |
hep-ph/9705433 | null | T. Csorgo (Columbia and KFKI RMKI) and J. Zimanyi (KFKI RMKI) | Analytic Solution of the Pion-Laser Model | LaTeX, ReVTeX 3.1, 7 pages, uses 1 eps figure and epsfig.sty
(shortened version) | Phys.Rev.Lett. 80 (1998) 916-918 | 10.1103/PhysRevLett.80.916 | null | hep-ph hep-th nucl-th physics.optics quant-ph | null | Brooding over bosons, wave packets and Bose - Einstein correlations, we find
that a generalization of the pion-laser model for the case of overlapping
wave-packets is analytically solvable with complete n-particle symmetrization.
The effective radius parameter of the two-particle correlation function is
reduced for low values and enlargened for high values of the mean momentum in
the rare gas limiting case, as compared to the case when multi-particle
symmetrization effects are neglected.
These results explicitly depend on the multiplicity, providing a theoretical
basis for event-by-event analysis of high energy heavy ion reactions.
| [
{
"created": "Mon, 26 May 1997 18:41:13 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 1997 10:12:39 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Csorgo",
"T.",
"",
"Columbia and KFKI RMKI"
],
[
"Zimanyi",
"J.",
"",
"KFKI RMKI"
]
] | Brooding over bosons, wave packets and Bose - Einstein correlations, we find that a generalization of the pion-laser model for the case of overlapping wave-packets is analytically solvable with complete n-particle symmetrization. The effective radius parameter of the two-particle correlation function is reduced for low values and enlargened for high values of the mean momentum in the rare gas limiting case, as compared to the case when multi-particle symmetrization effects are neglected. These results explicitly depend on the multiplicity, providing a theoretical basis for event-by-event analysis of high energy heavy ion reactions. |
1704.08249 | Andrew Larkoski | Kaustuv Datta and Andrew Larkoski | How Much Information is in a Jet? | 14 pages + appendices, 10 figures; v2: JHEP version, updated neural
network, included deeper network and boosted decision tree results | null | 10.1007/JHEP06(2017)073 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Machine learning techniques are increasingly being applied toward data
analyses at the Large Hadron Collider, especially with applications for
discrimination of jets with different originating particles. Previous studies
of the power of machine learning to jet physics has typically employed image
recognition, natural language processing, or other algorithms that have been
extensively developed in computer science. While these studies have
demonstrated impressive discrimination power, often exceeding that of
widely-used observables, they have been formulated in a non-constructive manner
and it is not clear what additional information the machines are learning. In
this paper, we study machine learning for jet physics constructively,
expressing all of the information in a jet onto sets of observables that
completely and minimally span N-body phase space. For concreteness, we study
the application of machine learning for discrimination of boosted, hadronic
decays of Z bosons from jets initiated by QCD processes. Our results
demonstrate that the information in a jet that is useful for discrimination
power of QCD jets from Z bosons is saturated by only considering observables
that are sensitive to 4-body (8 dimensional) phase space.
| [
{
"created": "Wed, 26 Apr 2017 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jun 2017 15:11:14 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Datta",
"Kaustuv",
""
],
[
"Larkoski",
"Andrew",
""
]
] | Machine learning techniques are increasingly being applied toward data analyses at the Large Hadron Collider, especially with applications for discrimination of jets with different originating particles. Previous studies of the power of machine learning to jet physics has typically employed image recognition, natural language processing, or other algorithms that have been extensively developed in computer science. While these studies have demonstrated impressive discrimination power, often exceeding that of widely-used observables, they have been formulated in a non-constructive manner and it is not clear what additional information the machines are learning. In this paper, we study machine learning for jet physics constructively, expressing all of the information in a jet onto sets of observables that completely and minimally span N-body phase space. For concreteness, we study the application of machine learning for discrimination of boosted, hadronic decays of Z bosons from jets initiated by QCD processes. Our results demonstrate that the information in a jet that is useful for discrimination power of QCD jets from Z bosons is saturated by only considering observables that are sensitive to 4-body (8 dimensional) phase space. |
1010.3588 | Paul Archer | Paul R. Archer, Stephan J. Huber | Reducing Constraints in a Higher Dimensional Extension of the Randall
and Sundrum Model | 27 pages, 15 figures, v3: Additional comments in sections 1, 2 and 4.
New appendix added. Five additional figures. References added | JHEP 1103:018,2011 | 10.1007/JHEP03(2011)018 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to investigate the phenomenological implications of warped spaces in
more than five dimensions, we consider a $4+1+\delta$ dimensional extension to
the Randall and Sundrum model in which the space is warped with respect to a
single direction by the presence of an anisotropic bulk cosmological constant.
The Einstein equations are solved, giving rise to a range of possible spaces in
which the $\delta$ additional spaces are warped. Here we consider models in
which the gauge fields are free to propagate into such spaces. After carrying
out the Kaluza Klein (KK) decomposition of such fields it is found that the KK
mass spectrum changes significantly depending on how the $\delta$ additional
dimensions are warped. We proceed to compute the lower bound on the KK mass
scale from electroweak observables for models with a bulk $SU(2)\times U(1)$
gauge symmetry and models with a bulk $SU(2)_R\times SU(2)_L\times U(1)$ gauge
symmetry. It is found that in both cases the most favourable bounds are
approximately $M_{KK}\gtrsim 2$ TeV, corresponding to a mass of the first gauge
boson excitation of about 4-6 TeV. Hence additional warped dimensions offer a
new way of reducing the constraints on the KK scale.
| [
{
"created": "Mon, 18 Oct 2010 13:12:39 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Nov 2010 11:53:54 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Feb 2011 15:06:25 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Archer",
"Paul R.",
""
],
[
"Huber",
"Stephan J.",
""
]
] | In order to investigate the phenomenological implications of warped spaces in more than five dimensions, we consider a $4+1+\delta$ dimensional extension to the Randall and Sundrum model in which the space is warped with respect to a single direction by the presence of an anisotropic bulk cosmological constant. The Einstein equations are solved, giving rise to a range of possible spaces in which the $\delta$ additional spaces are warped. Here we consider models in which the gauge fields are free to propagate into such spaces. After carrying out the Kaluza Klein (KK) decomposition of such fields it is found that the KK mass spectrum changes significantly depending on how the $\delta$ additional dimensions are warped. We proceed to compute the lower bound on the KK mass scale from electroweak observables for models with a bulk $SU(2)\times U(1)$ gauge symmetry and models with a bulk $SU(2)_R\times SU(2)_L\times U(1)$ gauge symmetry. It is found that in both cases the most favourable bounds are approximately $M_{KK}\gtrsim 2$ TeV, corresponding to a mass of the first gauge boson excitation of about 4-6 TeV. Hence additional warped dimensions offer a new way of reducing the constraints on the KK scale. |
2012.04599 | Menglin Du Dr. | Meng-Lin Du, Feng-Kun Guo, Christoph Hanhart, Bastian Kubis, and
Ulf-G. Mei{\ss}ner | Where is the lightest charmed scalar meson? | Note: Title slightly changed, version to appear in Phys. Rev. Lett.;
9 pages, 5 figures | Phys. Rev. Lett. 126, 192001 (2021) | 10.1103/PhysRevLett.126.192001 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The lightest charmed scalar meson is known as the $D_0^*(2300)$, which is one
of the earliest new hadron resonances observed at modern $B$ factories. We show
here that the parameters assigned to the lightest scalar $D$-meson are in
conflict with the precise LHCb data of the decay $B^-\to D^+ \pi^- \pi^-$. On
the contrary, these data can be well described by an unitarized chiral
amplitude containing a much lighter charmed scalar meson, the $D_0^*(2100)$. We
also extract the low-energy $S$-wave $D\pi$ phase of the decay $B^-\to D^+
\pi^- \pi^-$ from the data in a model-independent way, and show that its
difference from the $D\pi$ scattering phase shift can be traced back to an
intermediate $\rho^-$ exchange. Our work highlights that an analysis of data
consistent with chiral symmetry, unitarity, and analyticity is mandatory in
order to extract the properties of the ground-state scalar mesons in the singly
heavy sector correctly, in analogy to the light scalar mesons $f_0(500)$ and
$K_0^*(700)$.
| [
{
"created": "Tue, 8 Dec 2020 18:00:10 GMT",
"version": "v1"
},
{
"created": "Tue, 4 May 2021 14:39:32 GMT",
"version": "v2"
}
] | 2021-05-14 | [
[
"Du",
"Meng-Lin",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Hanhart",
"Christoph",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | The lightest charmed scalar meson is known as the $D_0^*(2300)$, which is one of the earliest new hadron resonances observed at modern $B$ factories. We show here that the parameters assigned to the lightest scalar $D$-meson are in conflict with the precise LHCb data of the decay $B^-\to D^+ \pi^- \pi^-$. On the contrary, these data can be well described by an unitarized chiral amplitude containing a much lighter charmed scalar meson, the $D_0^*(2100)$. We also extract the low-energy $S$-wave $D\pi$ phase of the decay $B^-\to D^+ \pi^- \pi^-$ from the data in a model-independent way, and show that its difference from the $D\pi$ scattering phase shift can be traced back to an intermediate $\rho^-$ exchange. Our work highlights that an analysis of data consistent with chiral symmetry, unitarity, and analyticity is mandatory in order to extract the properties of the ground-state scalar mesons in the singly heavy sector correctly, in analogy to the light scalar mesons $f_0(500)$ and $K_0^*(700)$. |
1110.0096 | Marco Frasca | Marco Frasca | Low-energy limit of QCD at finite temperature | 11 pages, 1 figure, contribution to the proceedings of the Eleventh
Workshop on Non-Perturbative Quantum Chromodynamics, Paris, June 6-10, 2011 | SLAC eConf C1106064, 27 (2011) | null | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are able to show, in the low-energy limit of quantum chromodynamics, that
the theory has a critical point. In this limit, QCD becomes a non-local
Nambu-Jona-Lasinio model. The critical temperature is also obtained in
agreement with lattice computations.
| [
{
"created": "Sat, 1 Oct 2011 12:32:31 GMT",
"version": "v1"
}
] | 2012-01-26 | [
[
"Frasca",
"Marco",
""
]
] | We are able to show, in the low-energy limit of quantum chromodynamics, that the theory has a critical point. In this limit, QCD becomes a non-local Nambu-Jona-Lasinio model. The critical temperature is also obtained in agreement with lattice computations. |
2206.14018 | Nishat Fiza | Nishat Fiza, Nafis Rezwan Khan Chowdhury, Mehedi Masud | Investigating Lorentz Violation with the long baseline experiment P2O | Published in JHEP, 9 figures, 29 pages, DUNE-only results added, more
simulation details included, conclusions unchanged | null | 10.1007/JHEP01(2023)076 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | One of the basic propositions of quantum field theory is Lorentz invariance.
The spontaneous breaking of Lorentz symmetry at a high energy scale can be
studied at low energy extensions like the Standard model in a model-independent
way through
effective field theory (EFT). The present and future Long-baseline neutrino
experiments can give a scope to observe such a Planck-suppressed physics of
Lorentz invariance violation (LIV). A proposed long baseline experiment,
Protvino to ORCA (dubbed "P2O") with a baseline of 2595 km, is expected to
provide good sensitivities to unresolved issues, especially neutrino mass
ordering. P2O can offer good statistics even with a moderate beam power and
runtime, owing to the very large ($\sim 6$ Mt) detector volume at KM3NeT/ ORCA.
Here we discuss in detail, how the individual LIV parameters affect neutrino
oscillations at P2O and DUNE baselines at the level of probability and derive
analytical expressions to understand interesting degeneracies and other
features. We estimate $\Delta \chi^{2}$ sensitivities to the LIV parameters,
analyzing their correlations among each other, and also with the standard
oscillation parameters. We calculate these results for P2O alone and also carry
out a combined analysis of P2O with DUNE. We point out crucial features in the
sensitivity contours and explain them qualitatively with the help of the
relevant probability expressions derived here. Finally, we estimate constraints
on the individual LIV parameters at $95\%$ confidence level (C.L.) intervals
stemming from the combined analysis of P2O and DUNE datasets and highlight the
improvement over the existing constraints. We also find out that the additional
degeneracy induced by the LIV parameter $a_{ee}$ around $-22 \times 10^{-23}$
GeV is lifted by the combined analysis at $95\%$ C.L.
| [
{
"created": "Tue, 28 Jun 2022 14:05:59 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2023 18:23:44 GMT",
"version": "v2"
}
] | 2023-02-08 | [
[
"Fiza",
"Nishat",
""
],
[
"Chowdhury",
"Nafis Rezwan Khan",
""
],
[
"Masud",
"Mehedi",
""
]
] | One of the basic propositions of quantum field theory is Lorentz invariance. The spontaneous breaking of Lorentz symmetry at a high energy scale can be studied at low energy extensions like the Standard model in a model-independent way through effective field theory (EFT). The present and future Long-baseline neutrino experiments can give a scope to observe such a Planck-suppressed physics of Lorentz invariance violation (LIV). A proposed long baseline experiment, Protvino to ORCA (dubbed "P2O") with a baseline of 2595 km, is expected to provide good sensitivities to unresolved issues, especially neutrino mass ordering. P2O can offer good statistics even with a moderate beam power and runtime, owing to the very large ($\sim 6$ Mt) detector volume at KM3NeT/ ORCA. Here we discuss in detail, how the individual LIV parameters affect neutrino oscillations at P2O and DUNE baselines at the level of probability and derive analytical expressions to understand interesting degeneracies and other features. We estimate $\Delta \chi^{2}$ sensitivities to the LIV parameters, analyzing their correlations among each other, and also with the standard oscillation parameters. We calculate these results for P2O alone and also carry out a combined analysis of P2O with DUNE. We point out crucial features in the sensitivity contours and explain them qualitatively with the help of the relevant probability expressions derived here. Finally, we estimate constraints on the individual LIV parameters at $95\%$ confidence level (C.L.) intervals stemming from the combined analysis of P2O and DUNE datasets and highlight the improvement over the existing constraints. We also find out that the additional degeneracy induced by the LIV parameter $a_{ee}$ around $-22 \times 10^{-23}$ GeV is lifted by the combined analysis at $95\%$ C.L. |
1701.08614 | Xiao-Gang He | Min He, Xiao-Gang He, Cheng-Kai Huang | Dark Photon Search at A Circular $e^+e^-$ Collider | RevTex, 9 pages with five figures. Minor modifications added | null | 10.1142/S0217751X1750138X | NCTS-PY1706 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the interesting portals linking a dark sector and the standard model
(SM) is the kinetic mixing between the SM $U(1)_Y$ field with a new dark photon
$A'$ from a $U(1)_{A'}$ gauge interaction. Stringent limits have been obtained
for the kinetic mixing parameter $\epsilon$ through various processes. In this
work, we study the possibility of searching for a dark photon interaction at a
circular $e^+e^-$ collider through the process $e^+ e^-\to \gamma A^{\prime *}
\to \gamma \mu^+\mu^-$. We find that the constraint on $\epsilon^2$ for dark
photon mass in the few tens of GeV range, assuming that the $\mu^+\mu^-$
invariant mass can be measured to an accuracy of $0.5\%m_{A'}$, can be better
than $3\times 10^{-6}$ for the proposed CEPC with a ten-year running at
3$\sigma$ (statistic) level, and better than $2\times 10^{-6}$ for FCC-ee with
even just one-year running at $\sqrt{s} = 240$ GeV, better than the LHC and
other facilities can do in a similar dark photon mass range. For FCC-ee,
running at $\sqrt{s}=160$ GeV, the constraint can be even better.
| [
{
"created": "Mon, 30 Jan 2017 14:29:10 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Feb 2017 04:49:04 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Mar 2017 08:08:33 GMT",
"version": "v3"
}
] | 2017-09-13 | [
[
"He",
"Min",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Huang",
"Cheng-Kai",
""
]
] | One of the interesting portals linking a dark sector and the standard model (SM) is the kinetic mixing between the SM $U(1)_Y$ field with a new dark photon $A'$ from a $U(1)_{A'}$ gauge interaction. Stringent limits have been obtained for the kinetic mixing parameter $\epsilon$ through various processes. In this work, we study the possibility of searching for a dark photon interaction at a circular $e^+e^-$ collider through the process $e^+ e^-\to \gamma A^{\prime *} \to \gamma \mu^+\mu^-$. We find that the constraint on $\epsilon^2$ for dark photon mass in the few tens of GeV range, assuming that the $\mu^+\mu^-$ invariant mass can be measured to an accuracy of $0.5\%m_{A'}$, can be better than $3\times 10^{-6}$ for the proposed CEPC with a ten-year running at 3$\sigma$ (statistic) level, and better than $2\times 10^{-6}$ for FCC-ee with even just one-year running at $\sqrt{s} = 240$ GeV, better than the LHC and other facilities can do in a similar dark photon mass range. For FCC-ee, running at $\sqrt{s}=160$ GeV, the constraint can be even better. |
hep-ph/9505367 | null | F.L. Braghin, D. Vautherin and A. Abada | Isovector response function of hot nuclear matter with Skyrme
interactions | 33 pages Email: braghin@ipncls.in2p3.fr | Phys.Rev.C52:2504,1995 | 10.1103/PhysRevC.52.2504 | UNITU-THEP-7/1995 and IPNO/TH 95-11 | hep-ph | null | We investigate the role of the effective nucleon-nucleon interaction in the
description of giant dipole resonances in hot nuclei. For this purpose we
calculate the response function of hot nuclear matter to a small isovector
external perturbation using various effective Skyrme interactions. We find that
for Skyrme forces with an effective mass close to unity an undamped zero sound
mode occurs at zero temperature. This mode gives rise in finite nuclei
(calculated via the Steinwedel-Jenssen model) to a resonance whose energy
agrees with the observed value. We find that zero sound disappears at a
temperature of a few MeV, leaving only a broad peak in the dipole strength. For
Skyrme forces with a small value of the effective mass (0.4- 0.5), there is no
zero sound at zero temperature but only a weak peak located too high in energy.
The strength distribution in this case is nearly independent of temperature and
shows small collective effects. The relevance of these results for the
saturation of photon multiplicities observed in recent experiments is pointed
out.
| [
{
"created": "Tue, 23 May 1995 17:27:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Braghin",
"F. L.",
""
],
[
"Vautherin",
"D.",
""
],
[
"Abada",
"A.",
""
]
] | We investigate the role of the effective nucleon-nucleon interaction in the description of giant dipole resonances in hot nuclei. For this purpose we calculate the response function of hot nuclear matter to a small isovector external perturbation using various effective Skyrme interactions. We find that for Skyrme forces with an effective mass close to unity an undamped zero sound mode occurs at zero temperature. This mode gives rise in finite nuclei (calculated via the Steinwedel-Jenssen model) to a resonance whose energy agrees with the observed value. We find that zero sound disappears at a temperature of a few MeV, leaving only a broad peak in the dipole strength. For Skyrme forces with a small value of the effective mass (0.4- 0.5), there is no zero sound at zero temperature but only a weak peak located too high in energy. The strength distribution in this case is nearly independent of temperature and shows small collective effects. The relevance of these results for the saturation of photon multiplicities observed in recent experiments is pointed out. |
hep-ph/0608035 | Gintaras Duda | Gintaras Duda, Ann Kemper, Paolo Gondolo | Model Independent Form Factors for Spin Independent Neutralino-Nucleon
Scattering from Elastic Electron Scattering Data | 20 pages, 8 figures | JCAP 0704:012,2007 | 10.1088/1475-7516/2007/04/012 | null | hep-ph | null | Theoretical calculations of neutralino-nucleon interaction rates with various
nuclei are of great interest to direct dark matter searches such as CDMS,
EDELWEISS, ZEPLIN, and other experiments since they are used to establish upper
bounds on the WIMP-proton cross section. These interaction rates and cross
sections are generally computed with standard, one or two parameter
model-dependent nuclear form factors, which may not exactly mirror the actual
form factor for the particular nucleus in question. As is well known, elastic
electron scattering can allow for very precise determinations of nuclear form
factors and hence nuclear charge densities for spherical or near-spherical
nuclei. We use charge densities derived from elastic electron scattering data
to calculate model independent, analytic form factors for various target nuclei
important in dark matter searches, such as Si, Ge, S, Ca and others. We have
found that for nuclear recoils in the range of 1-100 keV significant
differences in cross sections and rates exist when the model independent form
factors are used: at 30 keV nuclear recoil the form factors squared differ by a
factor of 1.06 for $^{28}$Si, 1.11 for $^{40}$Ca, 1.27 for $^{70}$Ge, and 1.92
for $^{129}$Xe. We show the effect of different form factors on the upper limit
on the WIMP-proton cross section obtained with a hypothetical $^{70}$Ge
detector during a 100 kg-day effective exposure. Helm form factors with various
parameter choices differ at most by 10--20% from the best (Fourier Bessel) form
factor, and can approach it to better than 1% if the parameters are chosen to
mimic the actual nuclear density.
| [
{
"created": "Thu, 3 Aug 2006 18:34:23 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2007 19:48:07 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Duda",
"Gintaras",
""
],
[
"Kemper",
"Ann",
""
],
[
"Gondolo",
"Paolo",
""
]
] | Theoretical calculations of neutralino-nucleon interaction rates with various nuclei are of great interest to direct dark matter searches such as CDMS, EDELWEISS, ZEPLIN, and other experiments since they are used to establish upper bounds on the WIMP-proton cross section. These interaction rates and cross sections are generally computed with standard, one or two parameter model-dependent nuclear form factors, which may not exactly mirror the actual form factor for the particular nucleus in question. As is well known, elastic electron scattering can allow for very precise determinations of nuclear form factors and hence nuclear charge densities for spherical or near-spherical nuclei. We use charge densities derived from elastic electron scattering data to calculate model independent, analytic form factors for various target nuclei important in dark matter searches, such as Si, Ge, S, Ca and others. We have found that for nuclear recoils in the range of 1-100 keV significant differences in cross sections and rates exist when the model independent form factors are used: at 30 keV nuclear recoil the form factors squared differ by a factor of 1.06 for $^{28}$Si, 1.11 for $^{40}$Ca, 1.27 for $^{70}$Ge, and 1.92 for $^{129}$Xe. We show the effect of different form factors on the upper limit on the WIMP-proton cross section obtained with a hypothetical $^{70}$Ge detector during a 100 kg-day effective exposure. Helm form factors with various parameter choices differ at most by 10--20% from the best (Fourier Bessel) form factor, and can approach it to better than 1% if the parameters are chosen to mimic the actual nuclear density. |
hep-ph/9406262 | Hai-Yang Cheng | Hai-Yang Cheng | Nonfactorizable Contributions to Nonleptonic Weak Decays of Heavy Mesons | 14 pages, IP-ASTP-11-94 | Phys.Lett. B335 (1994) 428-435 | 10.1016/0370-2693(94)90374-3 | null | hep-ph | null | Nonfactorizable contributions to exclusive two-body nonleptonic weak decays
of heavy mesons arising from color octet currents, characterized by the
parameter $r_2$, are extracted from the data. It is found that $r_2$ is equal
to $\sim -0.67\,$, $-(0.9\sim 1.1),~-(1.2\sim 1.3)$, $\sim 0.36$ respectively
for $D\to \bar{K}\pi,~\bar{K}^*\pi,~\bar{K}^*\rho,~\bar{B}\to D\pi$ decays. As
expected, soft-gluon effects become stronger when the decay particles are less
energetic, allowing more time for significant final-state strong interactions.
As a consequence, the parameter $a_2$ is not universal and is channel or class
dependent, contrary to the anticipation of the factorization approach. The
leading $1/N_c$ expansion works most successfully for $D\to\bar{K}\pi$ decays
as the subleading $1/N_c$ factorizable contribution is almost compensated by
the soft-gluon effect. We argue that, in contrast to what happens in $B^-\to
D^{(*)} \pi(\rho)$ decays, the nonfactorizable term and the subleading $1/N_c$
factorizable term in $\bar{B}\to \psi\bar{K}^{(*)}$ decays are opposite in
signs, in accordance with a recent QCD sum rule calculation. Implications are
discussed.
| [
{
"created": "Thu, 9 Jun 1994 15:57:43 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Cheng",
"Hai-Yang",
""
]
] | Nonfactorizable contributions to exclusive two-body nonleptonic weak decays of heavy mesons arising from color octet currents, characterized by the parameter $r_2$, are extracted from the data. It is found that $r_2$ is equal to $\sim -0.67\,$, $-(0.9\sim 1.1),~-(1.2\sim 1.3)$, $\sim 0.36$ respectively for $D\to \bar{K}\pi,~\bar{K}^*\pi,~\bar{K}^*\rho,~\bar{B}\to D\pi$ decays. As expected, soft-gluon effects become stronger when the decay particles are less energetic, allowing more time for significant final-state strong interactions. As a consequence, the parameter $a_2$ is not universal and is channel or class dependent, contrary to the anticipation of the factorization approach. The leading $1/N_c$ expansion works most successfully for $D\to\bar{K}\pi$ decays as the subleading $1/N_c$ factorizable contribution is almost compensated by the soft-gluon effect. We argue that, in contrast to what happens in $B^-\to D^{(*)} \pi(\rho)$ decays, the nonfactorizable term and the subleading $1/N_c$ factorizable term in $\bar{B}\to \psi\bar{K}^{(*)}$ decays are opposite in signs, in accordance with a recent QCD sum rule calculation. Implications are discussed. |
2306.06091 | Yu-Kuo Hsiao | Yu-Kuo Hsiao, Shu-Qi Yang, Wen-Juan Wei, Bai-Cian Ke | Testing the light scalar meson as a non-$q\bar q$ state in semileptonic
$D$ decays | 10 pages, 1 figure, 1 table | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | To distinguish between the normal $q\bar q$ and exotic diquark-antidiqark
($q^2\bar q^2$) contents of the lowest-lying scalar meson ($S_0$), we
investigate the semileptonic $D\to S_0 e^+\nu_e, S_0\to M_1 M_2$ decays, where
$M_{1(2)}$ represents a pseudoscalar meson. With the form factors extracted
from the current data, we calculate ${\cal B}(D_s^+\to \sigma_0
e^+\nu_e,\sigma_0\to\pi^0\pi^0) =(12.9^{+6.3}_{-4.9})\times 10^{-4}$ and
$(0.8^{+1.2}_{-0.7})\times 10^{-4}$ for the $q\bar q$ and $q^2\bar q^2$ quark
structures, respectively, and compare them to the experimental upper limit:
$6.4\times 10^{-4}$. It is clearly seen that $S_0$ prefers to be the $q^2\bar
q^2$ bound state. Particularly, ${\cal B}_{q\bar q}(D_s^+\to \sigma_0
e^+\nu_e,\sigma_0\to\pi^+\pi^-) =(25.8^{+12.5}_{-\;\,9.8})\times 10^{-4}$ and
${\cal B}_{q^2\bar q^2}(D_s^+\to \sigma_0 e^+\nu_e,\sigma_0\to\pi^+\pi^-)
=(1.5^{+2.4}_{-1.3})\times 10^{-4}$ are predicted to deviate far from each
other, useful for a clear experimental investigation.
| [
{
"created": "Fri, 9 Jun 2023 17:52:08 GMT",
"version": "v1"
}
] | 2023-06-12 | [
[
"Hsiao",
"Yu-Kuo",
""
],
[
"Yang",
"Shu-Qi",
""
],
[
"Wei",
"Wen-Juan",
""
],
[
"Ke",
"Bai-Cian",
""
]
] | To distinguish between the normal $q\bar q$ and exotic diquark-antidiqark ($q^2\bar q^2$) contents of the lowest-lying scalar meson ($S_0$), we investigate the semileptonic $D\to S_0 e^+\nu_e, S_0\to M_1 M_2$ decays, where $M_{1(2)}$ represents a pseudoscalar meson. With the form factors extracted from the current data, we calculate ${\cal B}(D_s^+\to \sigma_0 e^+\nu_e,\sigma_0\to\pi^0\pi^0) =(12.9^{+6.3}_{-4.9})\times 10^{-4}$ and $(0.8^{+1.2}_{-0.7})\times 10^{-4}$ for the $q\bar q$ and $q^2\bar q^2$ quark structures, respectively, and compare them to the experimental upper limit: $6.4\times 10^{-4}$. It is clearly seen that $S_0$ prefers to be the $q^2\bar q^2$ bound state. Particularly, ${\cal B}_{q\bar q}(D_s^+\to \sigma_0 e^+\nu_e,\sigma_0\to\pi^+\pi^-) =(25.8^{+12.5}_{-\;\,9.8})\times 10^{-4}$ and ${\cal B}_{q^2\bar q^2}(D_s^+\to \sigma_0 e^+\nu_e,\sigma_0\to\pi^+\pi^-) =(1.5^{+2.4}_{-1.3})\times 10^{-4}$ are predicted to deviate far from each other, useful for a clear experimental investigation. |
1111.3716 | Yi Ling | Yi Ling | A note on superluminal neutrinos and deformed special relativity | 2 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short note we remark that the OPERA measurement could be reconciled
with information from SN1987a in the context of deformed special relativity
without the loss of energy through Cherenkov-like process reported by Cohen and
Glashow.
| [
{
"created": "Wed, 16 Nov 2011 05:58:24 GMT",
"version": "v1"
}
] | 2011-11-17 | [
[
"Ling",
"Yi",
""
]
] | In this short note we remark that the OPERA measurement could be reconciled with information from SN1987a in the context of deformed special relativity without the loss of energy through Cherenkov-like process reported by Cohen and Glashow. |
2302.06879 | Michal Praszalowicz | Michal Praszalowicz | Heavy baryons in the Chiral Quark-Soliton Model | 6 pages, 1 figure. Presented at the Conference Excited QCD,
Giardini-Naxos, Italy, October 24 -- 28, 2022 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We review applications of the Chiral Quark Soliton Model to heavy baryons and
to doubly heavy tetraquarks.
| [
{
"created": "Tue, 14 Feb 2023 08:01:20 GMT",
"version": "v1"
}
] | 2023-02-15 | [
[
"Praszalowicz",
"Michal",
""
]
] | We review applications of the Chiral Quark Soliton Model to heavy baryons and to doubly heavy tetraquarks. |
hep-ph/0410235 | Paul Hoyer | Paul Hoyer and Stephane Peigne | QCD Green functions in a gluon field | 21 pages, 7 figures. Minor modifications in text. Version to be
published in JHEP | JHEP0412:051,2004 | 10.1088/1126-6708/2004/12/051 | HIP-2004-53/TH, LAPTH-1073/04 | hep-ph | null | We formulate a dressed perturbative expansion of QCD, where the standard
diagrams are evaluated in the presence of a constant external gluon field whose
magnitude is gaussian distributed. The approach is Poincar{\'e} and gauge
invariant, and modifies the usual results for hard processes only by power
suppressed contributions. Long distance propagation of quarks and gluons turns
out to be inhibited due to a branch point singularity instead of a pole at
$p^2=0$ in the quark and gluon propagators. The dressing keeps the (massless)
quarks in q qbar fluctuations of the photon at a finite distance from each
other.
| [
{
"created": "Fri, 15 Oct 2004 16:55:40 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Oct 2004 07:31:06 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Dec 2004 12:07:19 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Hoyer",
"Paul",
""
],
[
"Peigne",
"Stephane",
""
]
] | We formulate a dressed perturbative expansion of QCD, where the standard diagrams are evaluated in the presence of a constant external gluon field whose magnitude is gaussian distributed. The approach is Poincar{\'e} and gauge invariant, and modifies the usual results for hard processes only by power suppressed contributions. Long distance propagation of quarks and gluons turns out to be inhibited due to a branch point singularity instead of a pole at $p^2=0$ in the quark and gluon propagators. The dressing keeps the (massless) quarks in q qbar fluctuations of the photon at a finite distance from each other. |
1204.0478 | Natascia Vignaroli | Natascia Vignaroli | $\Delta F=1$ constraints on composite Higgs models with LR parity | 35 pp. Version to appear in PRD | Phys. Rev. D 86, 115011 (2012) | 10.1103/PhysRevD.86.115011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the bounds on the spectrum of composite Higgs models (CHM) that
come from flavor observables, by means of simple two-site effective
Lagrangians, which incorporate a custodial symmetry and a Left-Right parity and
which could also be adopted in further phenomenological studies on CHM. We
derive, in particular, an important constraint on the masses of the $(t_L,
b_L)$ partners, which does not depend on the flavor structure of the sector
beyond the SM. This bound is obtained from the "infrared" contribution to $b
\to s\gamma$ induced by the flavor-conserving effective vertex $Wt_Rb_R$. We
find that the presence of a custodial symmetry can play a role in protecting
this effective coupling and, as a consequence, in attenuating the constraint,
which, however, remains of the order of 1 TeV. In addition to this bound, we
calculate the constraints from the "ultraviolet" contribution to $b \to s
\gamma$, induced by loops of heavy fermions, and to $\epsilon^{'}/\epsilon_K$.
| [
{
"created": "Mon, 2 Apr 2012 17:42:40 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2012 16:48:14 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Nov 2012 20:10:21 GMT",
"version": "v3"
}
] | 2012-12-06 | [
[
"Vignaroli",
"Natascia",
""
]
] | We analyze the bounds on the spectrum of composite Higgs models (CHM) that come from flavor observables, by means of simple two-site effective Lagrangians, which incorporate a custodial symmetry and a Left-Right parity and which could also be adopted in further phenomenological studies on CHM. We derive, in particular, an important constraint on the masses of the $(t_L, b_L)$ partners, which does not depend on the flavor structure of the sector beyond the SM. This bound is obtained from the "infrared" contribution to $b \to s\gamma$ induced by the flavor-conserving effective vertex $Wt_Rb_R$. We find that the presence of a custodial symmetry can play a role in protecting this effective coupling and, as a consequence, in attenuating the constraint, which, however, remains of the order of 1 TeV. In addition to this bound, we calculate the constraints from the "ultraviolet" contribution to $b \to s \gamma$, induced by loops of heavy fermions, and to $\epsilon^{'}/\epsilon_K$. |
hep-ph/0605198 | Bjorn O. Lange | Bjorn O. Lange (MIT, LNS) | Inclusive semileptonic decays of the B meson | Invited talk at "Flavour Physics and CP Violation Conference,"
Vancouver, 2006, 6 pages. To be published Electronic Conference Proceedings
Archive | null | null | MIT-CTP 3741 | hep-ph | null | This talk is a short review on the theoretical issues and uncertainties in
the calculation of partial decay rates in inclusive B decays. The main emphasis
is on charmless semileptonic decays, the B -> X(s) gamma photon spectrum, and
the extraction of Vub using model-independent methods.
| [
{
"created": "Wed, 17 May 2006 18:09:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lange",
"Bjorn O.",
"",
"MIT, LNS"
]
] | This talk is a short review on the theoretical issues and uncertainties in the calculation of partial decay rates in inclusive B decays. The main emphasis is on charmless semileptonic decays, the B -> X(s) gamma photon spectrum, and the extraction of Vub using model-independent methods. |
2110.15927 | Edward Shuryak | Edward Shuryak and Ismail Zahed | Hadronic structure on the light-front I.\ Instanton effects and
quark-antiquark effective potentials | v2 has some text editing and notation clarifications | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | This is the first of a sequence of papers that address the non-perturbative
origin of the central, and spin-dependent forces between quarks. Its main
thrust is a focus on meson spectroscopy in the center of mass frame. We suggest
a "dense instanton ensemble" model for the QCD vacuum, to explain the
interquark forces in mesons, from quarkonia to heavy-light and light-light
ones, to the extent it is possible. The sequels will show how to export these
interactions to the light front, and derive the corresponding Hamiltonians and
mesonic wavefunctions.
| [
{
"created": "Fri, 29 Oct 2021 17:21:38 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2022 17:07:25 GMT",
"version": "v2"
}
] | 2022-08-10 | [
[
"Shuryak",
"Edward",
""
],
[
"Zahed",
"Ismail",
""
]
] | This is the first of a sequence of papers that address the non-perturbative origin of the central, and spin-dependent forces between quarks. Its main thrust is a focus on meson spectroscopy in the center of mass frame. We suggest a "dense instanton ensemble" model for the QCD vacuum, to explain the interquark forces in mesons, from quarkonia to heavy-light and light-light ones, to the extent it is possible. The sequels will show how to export these interactions to the light front, and derive the corresponding Hamiltonians and mesonic wavefunctions. |
2311.08789 | Wei Kou | Wei Kou, Xurong Chen | Unraveling Proton Strangeness: Determination of the Strangeness Sigma
Term with Statistical Significance | 8 pages, 3 figures, 4 tables, accepted by Physical Review D, some
spelling mistakes are fixed | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | This study delves into the contribution of the strange quark within the
proton, which influences several fundamental proton properties. By establishing
a robust relationship between the proton's quantum anomalous energy and the
sigma term, we successfully extract the contribution of the strangeness sigma
term in the proton, obtaining it from parameterized fits of the differential
cross-section using exponential and dipole forms. The extracted sigma term
values are estimated to be $455.62\pm64.60$ MeV (exponential fit) and
$337.74\pm106.79$ MeV (dipole fit). Additionally, we present novel results for
the proton trace anomalous energy, observing values of $0.13\pm0.02$
(exponential fit) and $0.15 \pm 0.03$ (dipole fit). Our analysis integrates the
novel data from the $J/\psi-007$ and GlueX collaborations, to some extent
providing an experimental phenomenological window into the non-zero strange
quark content inside proton, with the statistical significances: $7.1\sigma$
(exponential fit) and $3.2\sigma$ (dipole fit), respectively. Furthermore, we
discussed the possibility of scheme-independence in the extraction results and
examine the uniformity of sigma terms obtained from the datasets provided by
the two collaborations. Our analysis may reveals compatibility between the
extracted results of the respective experiments.
| [
{
"created": "Wed, 15 Nov 2023 09:02:47 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Feb 2024 03:32:37 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Feb 2024 03:09:34 GMT",
"version": "v3"
}
] | 2024-02-14 | [
[
"Kou",
"Wei",
""
],
[
"Chen",
"Xurong",
""
]
] | This study delves into the contribution of the strange quark within the proton, which influences several fundamental proton properties. By establishing a robust relationship between the proton's quantum anomalous energy and the sigma term, we successfully extract the contribution of the strangeness sigma term in the proton, obtaining it from parameterized fits of the differential cross-section using exponential and dipole forms. The extracted sigma term values are estimated to be $455.62\pm64.60$ MeV (exponential fit) and $337.74\pm106.79$ MeV (dipole fit). Additionally, we present novel results for the proton trace anomalous energy, observing values of $0.13\pm0.02$ (exponential fit) and $0.15 \pm 0.03$ (dipole fit). Our analysis integrates the novel data from the $J/\psi-007$ and GlueX collaborations, to some extent providing an experimental phenomenological window into the non-zero strange quark content inside proton, with the statistical significances: $7.1\sigma$ (exponential fit) and $3.2\sigma$ (dipole fit), respectively. Furthermore, we discussed the possibility of scheme-independence in the extraction results and examine the uniformity of sigma terms obtained from the datasets provided by the two collaborations. Our analysis may reveals compatibility between the extracted results of the respective experiments. |
2104.09513 | Matthew Sievert | Andrey V. Sadofyev, Matthew D. Sievert, Ivan Vitev | Ab Initio Coupling of Jets to Collective Flow in the Opacity Expansion
Approach | 94 pages, 12 figures, 1 table | null | 10.1103/PhysRevD.104.094044 | LA-UR-21-21420 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the leading corrections to jet momentum broadening and
medium-induced branching that arise from the velocity of the moving medium at
first order in opacity. These results advance our knowledge of jet quenching
and demonstrate how it couples to collective flow of the quark-gluon plasma in
heavy-ion collisions and to the orbital motion of partons in cold nuclear
matter in deep inelastic scattering at the electron-ion collider. We also
compute the leading corrections to jet momentum broadening due to transverse
gradients of temperature and density. We find that these effects lead to both
anisotropic transverse momentum diffusion proportional to the medium velocity
and anisotropic medium-induced radiation emitted preferentially in the
direction of the flow. We isolate the relevant sub-eikonal corrections by
working with jets composed of scalar particles with arbitrary color factors
interacting with the medium by scalar QCD. Appropriate substitution of the
color factors and light-front wave functions allow us to immediately apply the
results to a range of processes including $q \rightarrow q g$ branching in real
QCD. The resulting general expressions can be directly coupled to hydrodynamic
simulations on an event-by-event basis to study the correlations between jet
quenching and the dynamics of various forms of nuclear matter.
| [
{
"created": "Mon, 19 Apr 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2022 02:58:30 GMT",
"version": "v2"
}
] | 2022-01-24 | [
[
"Sadofyev",
"Andrey V.",
""
],
[
"Sievert",
"Matthew D.",
""
],
[
"Vitev",
"Ivan",
""
]
] | We calculate the leading corrections to jet momentum broadening and medium-induced branching that arise from the velocity of the moving medium at first order in opacity. These results advance our knowledge of jet quenching and demonstrate how it couples to collective flow of the quark-gluon plasma in heavy-ion collisions and to the orbital motion of partons in cold nuclear matter in deep inelastic scattering at the electron-ion collider. We also compute the leading corrections to jet momentum broadening due to transverse gradients of temperature and density. We find that these effects lead to both anisotropic transverse momentum diffusion proportional to the medium velocity and anisotropic medium-induced radiation emitted preferentially in the direction of the flow. We isolate the relevant sub-eikonal corrections by working with jets composed of scalar particles with arbitrary color factors interacting with the medium by scalar QCD. Appropriate substitution of the color factors and light-front wave functions allow us to immediately apply the results to a range of processes including $q \rightarrow q g$ branching in real QCD. The resulting general expressions can be directly coupled to hydrodynamic simulations on an event-by-event basis to study the correlations between jet quenching and the dynamics of various forms of nuclear matter. |
1004.1469 | FengLan Shao | Rui-qin Wang, Feng-lan Shao, Jun Song and Qu-bing Xie | Hadron yield correlation and constituent quark degree of freedom in
heavy ion collisions | 7 pages, 3 figures, | null | null | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | Based on the assumption of the production of deconfined quark matter, we use
a quark combination model to systematically investigate hadron yields in heavy
ion collisions from RHIC $\sqrt{s_{NN}}=200, 130, 62.4$ GeV to SPS
$E_{beam}=158, 80, 40, 30, 20 $ AGeV. We find that as the collision energy is
greater than or equal to 30 AGeV the yields of various hadrons, their
correlations, in particular, the observables $A=\frac{\bar{\Lambda} k^{-}
p}{\Lambda k^{+} \bar{p}}$ and $B=\frac{\Lambda
k^{-}\bar{\Xi}^{+}}{\bar{\Lambda} k^{+}\Xi^{-}}$, are all reproduced; however,
as the collision energy drops to 20 AGeV quark combination fails. This
indicates that the constituent quark degrees of freedom represent a decisive
factor in thermal hadron production above 30 AGeV and seem to be invalid at 20
AGeV. In addition, hadron yields as well as particle ratios at midrapidity in
the most central Pb+Pb collisions at $\sqrt{s_{NN}}=5.5$ TeV are predicted.
| [
{
"created": "Fri, 9 Apr 2010 06:47:07 GMT",
"version": "v1"
}
] | 2010-04-12 | [
[
"Wang",
"Rui-qin",
""
],
[
"Shao",
"Feng-lan",
""
],
[
"Song",
"Jun",
""
],
[
"Xie",
"Qu-bing",
""
]
] | Based on the assumption of the production of deconfined quark matter, we use a quark combination model to systematically investigate hadron yields in heavy ion collisions from RHIC $\sqrt{s_{NN}}=200, 130, 62.4$ GeV to SPS $E_{beam}=158, 80, 40, 30, 20 $ AGeV. We find that as the collision energy is greater than or equal to 30 AGeV the yields of various hadrons, their correlations, in particular, the observables $A=\frac{\bar{\Lambda} k^{-} p}{\Lambda k^{+} \bar{p}}$ and $B=\frac{\Lambda k^{-}\bar{\Xi}^{+}}{\bar{\Lambda} k^{+}\Xi^{-}}$, are all reproduced; however, as the collision energy drops to 20 AGeV quark combination fails. This indicates that the constituent quark degrees of freedom represent a decisive factor in thermal hadron production above 30 AGeV and seem to be invalid at 20 AGeV. In addition, hadron yields as well as particle ratios at midrapidity in the most central Pb+Pb collisions at $\sqrt{s_{NN}}=5.5$ TeV are predicted. |
hep-ph/9710413 | Robert Harlander | R. Harlander and M. Steinhauser | O(\alpha_s^2) Corrections to Top Quark Production at $e^+e^-$ Colliders | LaTeX, 13 pages, 10 figures included as ps-files. 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/ | Eur.Phys.J.C2:151-158,1998 | 10.1007/s100520050129 | MPI/PhT/97-66, TTP97-40 | hep-ph | null | In this article we evaluate mass corrections up to $O((m^2/q^2)^6)$ to the
three-loop polarization function induced by an axial-vector current. Special
emphasis is put on the evaluation of the singlet diagram which is absent in the
vector case. As a physical application $O(\alpha_s^2)$ corrections to the
production of top quarks at future $e^+e^-$ colliders is considered. It is
demonstrated that for center of mass energies $\sqrt{s} >~ 500$ GeV the
inclusion of the first seven terms into the cross section leads to a reliable
description.
| [
{
"created": "Mon, 20 Oct 1997 14:57:23 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Harlander",
"R.",
""
],
[
"Steinhauser",
"M.",
""
]
] | In this article we evaluate mass corrections up to $O((m^2/q^2)^6)$ to the three-loop polarization function induced by an axial-vector current. Special emphasis is put on the evaluation of the singlet diagram which is absent in the vector case. As a physical application $O(\alpha_s^2)$ corrections to the production of top quarks at future $e^+e^-$ colliders is considered. It is demonstrated that for center of mass energies $\sqrt{s} >~ 500$ GeV the inclusion of the first seven terms into the cross section leads to a reliable description. |
hep-ph/9405388 | null | S. Catani and F. Hautmann | High-Energy Factorization and Small-X Deep Inelastic Scattering Beyond
Leading Order | 46 pages (+ 7 figures not included, available from the authors),
Latex, Cavendish-HEP-94/01 | Nucl.Phys. B427 (1994) 475-524 | 10.1016/0550-3213(94)90636-X | null | hep-ph | null | High-energy factorization in QCD is investigated beyond leading order and its
relationship to the factorization theorem of mass singularities is established
to any collinear accuracy. Flavour non-singlet observables are shown to be
regular at small x order by order in perturbation theory. In the singlet
sector, we derive the relevant master equations for the space-like evolution of
gluons and quarks. Their solution enables us to sum next-to-leading corrections
to the small-x behaviour of quark anomalous dimensions and deep inelastic
scattering coefficient functions. We present results in both MSbar and DIS
factorization schemes.
| [
{
"created": "Thu, 26 May 1994 13:16:31 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Catani",
"S.",
""
],
[
"Hautmann",
"F.",
""
]
] | High-energy factorization in QCD is investigated beyond leading order and its relationship to the factorization theorem of mass singularities is established to any collinear accuracy. Flavour non-singlet observables are shown to be regular at small x order by order in perturbation theory. In the singlet sector, we derive the relevant master equations for the space-like evolution of gluons and quarks. Their solution enables us to sum next-to-leading corrections to the small-x behaviour of quark anomalous dimensions and deep inelastic scattering coefficient functions. We present results in both MSbar and DIS factorization schemes. |
hep-ph/9609282 | Alan R. White | Alan R. White | The Hard Gluon Component of the QCD Pomeron | 8 pages, with 7 ps figures in the text | null | null | ANL-HEP-CP-96-74 | hep-ph | null | We argue that deep-inelastic diffractive scaling provides fundamental insight
into the QCD Pomeron. The logarithmic scaling violations seen experimentally
are in conflict with the scale-invariance of the BFKL Pomeron and with
phenomenological two-gluon models. Instead the Pomeron appears as a single
gluon at short-distances, indicating the appearance of a Super-Critical phase
of Reggeon Field Theory. That the color compensation takes place at a longer
distance is consistent with the Pomeron carrying odd color charge parity.
| [
{
"created": "Fri, 6 Sep 1996 21:51:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"White",
"Alan R.",
""
]
] | We argue that deep-inelastic diffractive scaling provides fundamental insight into the QCD Pomeron. The logarithmic scaling violations seen experimentally are in conflict with the scale-invariance of the BFKL Pomeron and with phenomenological two-gluon models. Instead the Pomeron appears as a single gluon at short-distances, indicating the appearance of a Super-Critical phase of Reggeon Field Theory. That the color compensation takes place at a longer distance is consistent with the Pomeron carrying odd color charge parity. |
1902.05480 | Ulrich Haisch | Martin Gorbahn and Ulrich Haisch | Two-loop amplitudes for Higgs plus jet production involving a modified
trilinear Higgs coupling | 13 pages, 1 figure; v2: version accepted by JHEP | null | 10.1007/JHEP04(2019)062 | LTH 1198 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the contributions to the two-loop scattering amplitudes $h \to
gg$, $h \to ggg$ and $h \to q \bar q g$ that arise from a modified trilinear
Higgs coupling $\lambda$. Analytic expressions are obtained by performing an
asymptotic expansion near the limit of infinitely heavy top quark. The
calculated amplitudes are necessary to study the impact of the ${\cal O}
(\lambda)$ corrections to the transverse momentum distributions ($p_{T,h}$) in
single-Higgs production at hadron colliders for low and moderate values of
$p_{T,h}$.
| [
{
"created": "Thu, 14 Feb 2019 16:28:14 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 2019 14:09:44 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Gorbahn",
"Martin",
""
],
[
"Haisch",
"Ulrich",
""
]
] | We calculate the contributions to the two-loop scattering amplitudes $h \to gg$, $h \to ggg$ and $h \to q \bar q g$ that arise from a modified trilinear Higgs coupling $\lambda$. Analytic expressions are obtained by performing an asymptotic expansion near the limit of infinitely heavy top quark. The calculated amplitudes are necessary to study the impact of the ${\cal O} (\lambda)$ corrections to the transverse momentum distributions ($p_{T,h}$) in single-Higgs production at hadron colliders for low and moderate values of $p_{T,h}$. |
1007.5072 | Carina Maria Zanetti | C. M. Zanetti and A. A. Natale | Nonleptonic $B$ meson decays in collinear pQCD at twist-3: Effects of
dynamical masses of gluons and quarks | 9 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the amplitudes for non-leptonic annihilation decays of $B$ mesons
into two particles within the pQCD collinear approach. The end point
divergences are regulated with the help of an infrared finite gluon propagator
characterized by a non-perturbative dynamical gluon mass consistent with recent
lattice simulations. The divergences at twist-3 are regulated by a dynamical
quark mass. Our results fit quite well the existent data of $B^0\to D_s^-K^+$
and $B^0\to D_s^{-*}\bar{K}^+$ for the expected range of dynamical gluon
masses. We also make predictions for the rare decays $\bar{B}^0\to K^-K^+$,
$\bar{B}^0_s\to \pi^-\pi^+,\pi^0\pi^0$, $B^+\to D_s^{(*)+}\bar{K}^0$, $B^0\to
D_s^{\pm(*)} K^\mp$ and $B_s^0\to D^{\pm(*)} \pi^\mp, D^0\pi^0$.
| [
{
"created": "Wed, 28 Jul 2010 20:38:58 GMT",
"version": "v1"
}
] | 2010-07-30 | [
[
"Zanetti",
"C. M.",
""
],
[
"Natale",
"A. A.",
""
]
] | We compute the amplitudes for non-leptonic annihilation decays of $B$ mesons into two particles within the pQCD collinear approach. The end point divergences are regulated with the help of an infrared finite gluon propagator characterized by a non-perturbative dynamical gluon mass consistent with recent lattice simulations. The divergences at twist-3 are regulated by a dynamical quark mass. Our results fit quite well the existent data of $B^0\to D_s^-K^+$ and $B^0\to D_s^{-*}\bar{K}^+$ for the expected range of dynamical gluon masses. We also make predictions for the rare decays $\bar{B}^0\to K^-K^+$, $\bar{B}^0_s\to \pi^-\pi^+,\pi^0\pi^0$, $B^+\to D_s^{(*)+}\bar{K}^0$, $B^0\to D_s^{\pm(*)} K^\mp$ and $B_s^0\to D^{\pm(*)} \pi^\mp, D^0\pi^0$. |
1808.07615 | Stephen P. Martin | Stephen P. Martin and Hiren H. Patel | Two-loop effective potential for generalized gauge fixing | 53 pages | Phys. Rev. D 98, 076008 (2018) | 10.1103/PhysRevD.98.076008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the two-loop effective potential for general renormalizable
theories, using a generalized gauge-fixing scheme that includes as special
cases the background-field $R_\xi$ gauges, the Fermi gauges, and the familiar
Landau gauge, and using dimensional regularization in the bare and \MSbar
renormalization schemes. As examples, the results are then specialized to the
Abelian Higgs model and to the Standard Model. In the case of the Standard
Model, we study how the vacuum expectation value and the minimum vacuum energy
depend numerically on the gauge-fixing parameters. The results at fixed
two-loop order exhibit non-convergent behavior for sufficiently large
gauge-fixing parameters; this can presumably be addressed by a resummation of
higher-order contributions.
| [
{
"created": "Thu, 23 Aug 2018 03:15:08 GMT",
"version": "v1"
}
] | 2018-10-24 | [
[
"Martin",
"Stephen P.",
""
],
[
"Patel",
"Hiren H.",
""
]
] | We obtain the two-loop effective potential for general renormalizable theories, using a generalized gauge-fixing scheme that includes as special cases the background-field $R_\xi$ gauges, the Fermi gauges, and the familiar Landau gauge, and using dimensional regularization in the bare and \MSbar renormalization schemes. As examples, the results are then specialized to the Abelian Higgs model and to the Standard Model. In the case of the Standard Model, we study how the vacuum expectation value and the minimum vacuum energy depend numerically on the gauge-fixing parameters. The results at fixed two-loop order exhibit non-convergent behavior for sufficiently large gauge-fixing parameters; this can presumably be addressed by a resummation of higher-order contributions. |
2006.01545 | Mirzayusuf Musakhanov | M. Musakhanov (1), N. Rakhimov (1), U.T. Yakhshiev (1,2,3) ((1)
National University of Uzbekistan, (2) Inha University, (3) Institute of
Nuclear Physics, AS RUz) | Heavy quark correlators in Instanton Liquid Model with perturbative
corrections | 13 pages, 7 figures, minor corrections | Phys. Rev. D 102, 076022 (2020) | 10.1103/PhysRevD.102.076022 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we consider the influence on the heavy quark correlators
due to the instanton background in the framework of instanton liquid model
(ILM) of QCD vacuum by taking into account also the perturbative gluon effects.
For a single heavy quark this leads to the mass shift due to the
direct-instanton nonperturbative and ILM modified perturbative contributions,
respectively. In the heavy quark-antiquark ($Q\bar{Q}$) sector we obtain the
potential consisting the direct instanton induced part and the one-gluon
exchange (OGE) perturbative part which is screened at large distances due to
the nonperturbative dynamics. At the region of interest corresponding to the
heavy quark physics the screening effect in OGE can be well approximated by a
Yukawa-type potential in terms of the dynamically generated gluon mass.
A possible implication of the present studies to the phenomenology of heavy
quarkonium is also discussed.
| [
{
"created": "Tue, 2 Jun 2020 12:10:25 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2020 09:21:57 GMT",
"version": "v2"
}
] | 2020-11-19 | [
[
"Musakhanov",
"M.",
""
],
[
"Rakhimov",
"N.",
""
],
[
"Yakhshiev",
"U. T.",
""
]
] | In the present work we consider the influence on the heavy quark correlators due to the instanton background in the framework of instanton liquid model (ILM) of QCD vacuum by taking into account also the perturbative gluon effects. For a single heavy quark this leads to the mass shift due to the direct-instanton nonperturbative and ILM modified perturbative contributions, respectively. In the heavy quark-antiquark ($Q\bar{Q}$) sector we obtain the potential consisting the direct instanton induced part and the one-gluon exchange (OGE) perturbative part which is screened at large distances due to the nonperturbative dynamics. At the region of interest corresponding to the heavy quark physics the screening effect in OGE can be well approximated by a Yukawa-type potential in terms of the dynamically generated gluon mass. A possible implication of the present studies to the phenomenology of heavy quarkonium is also discussed. |
0912.0613 | Vladimir Petrov | V. A. Petrov | Explicit Chiral Symmetry Breaking as a Premise of the Cross-Sections'
Rise | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that if QCD yields a theory of interacting hadrons then explicit
chiral symmetry breaking is a necessary condition for infinitely rising
cross-sections. Otherwise cross-sections go to zero at high energies.
| [
{
"created": "Thu, 3 Dec 2009 10:04:24 GMT",
"version": "v1"
}
] | 2009-12-04 | [
[
"Petrov",
"V. A.",
""
]
] | We argue that if QCD yields a theory of interacting hadrons then explicit chiral symmetry breaking is a necessary condition for infinitely rising cross-sections. Otherwise cross-sections go to zero at high energies. |
hep-ph/0603123 | Michele Frigerio | Michele Frigerio (Saclay, SPhT), Thomas Hambye (UAM) and Ernest Ma
(UCR) | Right-Handed Sector Leptogenesis | 14 pages, latex, axodraw; minor clarifications and references added,
extended discussion of the signatures at colliders | JCAP 0609 (2006) 009 | 10.1088/1475-7516/2006/09/009 | SACLAY-T06/024, UCRHEP-T408 | hep-ph | null | Instead of creating the observed baryon asymmetry of the universe by the
decay of right-handed (RH) neutrinos to left-handed leptons, we propose to
generate it dominantly by the decay of the RH neutrinos to RH leptons. This
mechanism turns out to be successful in large regions of parameter space. It
may work, in particular, at a scale as low as $\sim$~TeV, with no need to
invoke quasi-degenerate RH neutrino masses to resonantly enhance the asymmetry.
Such a possibility can be probed experimentally by the observation at colliders
of a singlet charged Higgs particle and of RH neutrinos. Other mechanisms which
may lead to successful leptogenesis from the RH lepton sector interactions are
also briefly presented. The incorporation of these scenarios in left-right
symmetric and unified models is discussed.
| [
{
"created": "Thu, 16 Mar 2006 15:00:16 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2006 19:21:18 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Frigerio",
"Michele",
"",
"Saclay, SPhT"
],
[
"Hambye",
"Thomas",
"",
"UAM"
],
[
"Ma",
"Ernest",
"",
"UCR"
]
] | Instead of creating the observed baryon asymmetry of the universe by the decay of right-handed (RH) neutrinos to left-handed leptons, we propose to generate it dominantly by the decay of the RH neutrinos to RH leptons. This mechanism turns out to be successful in large regions of parameter space. It may work, in particular, at a scale as low as $\sim$~TeV, with no need to invoke quasi-degenerate RH neutrino masses to resonantly enhance the asymmetry. Such a possibility can be probed experimentally by the observation at colliders of a singlet charged Higgs particle and of RH neutrinos. Other mechanisms which may lead to successful leptogenesis from the RH lepton sector interactions are also briefly presented. The incorporation of these scenarios in left-right symmetric and unified models is discussed. |
0705.4383 | Yury Bystritskiy | E. A. Kuraev, V. N. Pervushin, M. K. Volkov | To a question on the \eta \to \pi^0 \gamma \gamma decay width in
meson-baryon chiral model | 4 pages, 1 pic | JETPLett.86:164-166,2007 | 10.1134/S0021364007150039 | null | hep-ph | null | It is shown in the work of one of the authors in 1979 (MKV) that the
contribution to the amplitude of this decay from diagrams with one baryon loop
is equal to zero and contributions from diagrams with meson loops appear very
small. However, pole diagrams with intermediate vector mesons were not
considered there. Here it is shown that contributions of these pole diagrams
dominate. The meson-baryon chiral model used here is compared with known quark
chiral models. The obtained results are in satisfactory agreement with recent
experimental data.
| [
{
"created": "Wed, 30 May 2007 12:53:17 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jun 2007 10:43:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kuraev",
"E. A.",
""
],
[
"Pervushin",
"V. N.",
""
],
[
"Volkov",
"M. K.",
""
]
] | It is shown in the work of one of the authors in 1979 (MKV) that the contribution to the amplitude of this decay from diagrams with one baryon loop is equal to zero and contributions from diagrams with meson loops appear very small. However, pole diagrams with intermediate vector mesons were not considered there. Here it is shown that contributions of these pole diagrams dominate. The meson-baryon chiral model used here is compared with known quark chiral models. The obtained results are in satisfactory agreement with recent experimental data. |
1210.5501 | Itay Yavin | Josef Pradler, Balraj Singh, and Itay Yavin | On an unverified nuclear decay and its role in the DAMA experiment | 8 pages, 3 figures; v2 - published version; results unchanged; an
addendum can be found in http://arxiv.org/abs/arXiv:1210.7548 | Physics Letters B 720 (2013), pp. 399-404 | 10.1016/j.physletb.2013.02.033 | null | hep-ph astro-ph.HE nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rate of the direct decay of 40K to the ground state of 40Ar through
electron capture has not been experimentally reported. Aside from its inherent
importance for the theory of electron capture as the only such decay known of
its type (unique third-forbidden), this decay presents an irreducible
background in the DAMA experiment. We find that the presence of this
background, as well as others, poses a challenge to any interpretation of the
DAMA results in terms of a Dark Matter model with a small modulation fraction.
A 10ppb contamination of natural potassium requires a 20% modulation fraction
or more. A 20ppb contamination, which is reported as an upper limit by DAMA,
disfavors any Dark Matter origin of the signal. This conclusion is based on the
efficiency of detecting 40K decays as inferred from simulation. We propose
measures to help clarify the situation.
| [
{
"created": "Fri, 19 Oct 2012 19:08:38 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2013 14:50:34 GMT",
"version": "v2"
}
] | 2013-03-27 | [
[
"Pradler",
"Josef",
""
],
[
"Singh",
"Balraj",
""
],
[
"Yavin",
"Itay",
""
]
] | The rate of the direct decay of 40K to the ground state of 40Ar through electron capture has not been experimentally reported. Aside from its inherent importance for the theory of electron capture as the only such decay known of its type (unique third-forbidden), this decay presents an irreducible background in the DAMA experiment. We find that the presence of this background, as well as others, poses a challenge to any interpretation of the DAMA results in terms of a Dark Matter model with a small modulation fraction. A 10ppb contamination of natural potassium requires a 20% modulation fraction or more. A 20ppb contamination, which is reported as an upper limit by DAMA, disfavors any Dark Matter origin of the signal. This conclusion is based on the efficiency of detecting 40K decays as inferred from simulation. We propose measures to help clarify the situation. |
0910.1584 | Konstantin Matchev | Konstantin T. Matchev and Myeonghun Park | A general method for determining the masses of semi-invisibly decaying
particles at hadron colliders | thoroughly revised; all new figures; new results on pages 3 and 4;
new illustrative example; includes detector simulation. 4 pages, 6 figures,
uses revtex and axodraw | Phys.Rev.Lett.107:061801,2011 | 10.1103/PhysRevLett.107.061801 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general solution to the long standing problem of determining the
masses of pair-produced, semi-invisibly decaying particles at hadron colliders.
We define two new transverse kinematic variables, $M_{CT_\perp}$ and
$M_{CT_\parallel}$, which are suitable one-dimensional projections of the
contransverse mass $M_{CT}$. We derive analytical formulas for the boundaries
of the kinematically allowed regions in the $(M_{CT_\perp},M_{CT_\parallel})$
and $(M_{CT_\perp},M_{CT})$ parameter planes, and introduce suitable variables
$D_{CT_\parallel}$ and $D_{CT}$ to measure the distance to those boundaries on
an event per event basis. We show that the masses can be reliably extracted
from the endpoint measurements of $M_{CT_\perp}^{max}$ and $D_{CT}^{min}$ (or
$D_{CT_\parallel}^{min}$). We illustrate our method with dilepton $t\bar{t}$
events at the LHC.
| [
{
"created": "Fri, 9 Oct 2009 19:29:29 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Dec 2010 16:36:20 GMT",
"version": "v2"
}
] | 2011-08-22 | [
[
"Matchev",
"Konstantin T.",
""
],
[
"Park",
"Myeonghun",
""
]
] | We present a general solution to the long standing problem of determining the masses of pair-produced, semi-invisibly decaying particles at hadron colliders. We define two new transverse kinematic variables, $M_{CT_\perp}$ and $M_{CT_\parallel}$, which are suitable one-dimensional projections of the contransverse mass $M_{CT}$. We derive analytical formulas for the boundaries of the kinematically allowed regions in the $(M_{CT_\perp},M_{CT_\parallel})$ and $(M_{CT_\perp},M_{CT})$ parameter planes, and introduce suitable variables $D_{CT_\parallel}$ and $D_{CT}$ to measure the distance to those boundaries on an event per event basis. We show that the masses can be reliably extracted from the endpoint measurements of $M_{CT_\perp}^{max}$ and $D_{CT}^{min}$ (or $D_{CT_\parallel}^{min}$). We illustrate our method with dilepton $t\bar{t}$ events at the LHC. |
2102.06830 | Ying Zhang | Ying Zhang | The Minimal Flavor Structure from Decomposition of the Fermion Mass
Matrix | 15 pages, 5 figures, 2 tables, includes appendix | Nuclear Physics B 976 (2022) 115699 | 10.1016/j.nuclphysb.2022.115699 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The minimal flavor structures for both quarks and leptons are proposed to
address fermion mass hierarchy and flavor mixings by bi-unitary decomposition
of the fermion mass matrix. The real matrix ${\bf M}_0^f$ is completely
responsive to family mass hierarchy, which is expressed by a close-to-flat
matrix structure. The left-handed unitary phase ${\bf F}_L^f$ provides the
origin of CP violation in quark and lepton mixings, which can be explained as a
quantum effect between Yukawa interaction states and weak gauge states. The
minimal flavor structure is realized by just 10 parameters without any
redundancy, corresponding to 6 fermion masses, 3 mixing angles and 1 CP
violation in the quark/lepton sector. This approach provides a general flavor
structure independent of the specific quark or lepton flavor data. We verify
the validation of the flavor structure by reproducing quark/lepton masses and
mixings. Some possible scenarios that yield the flavor structure are also
discussed.
| [
{
"created": "Sat, 13 Feb 2021 00:35:44 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Apr 2021 06:31:59 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jun 2021 04:27:52 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Feb 2022 01:19:30 GMT",
"version": "v4"
}
] | 2022-02-16 | [
[
"Zhang",
"Ying",
""
]
] | The minimal flavor structures for both quarks and leptons are proposed to address fermion mass hierarchy and flavor mixings by bi-unitary decomposition of the fermion mass matrix. The real matrix ${\bf M}_0^f$ is completely responsive to family mass hierarchy, which is expressed by a close-to-flat matrix structure. The left-handed unitary phase ${\bf F}_L^f$ provides the origin of CP violation in quark and lepton mixings, which can be explained as a quantum effect between Yukawa interaction states and weak gauge states. The minimal flavor structure is realized by just 10 parameters without any redundancy, corresponding to 6 fermion masses, 3 mixing angles and 1 CP violation in the quark/lepton sector. This approach provides a general flavor structure independent of the specific quark or lepton flavor data. We verify the validation of the flavor structure by reproducing quark/lepton masses and mixings. Some possible scenarios that yield the flavor structure are also discussed. |
1109.2718 | Nikolaos Stefanis | N. G. Stefanis | Pion-photon transition form factor. Living on the QCD frontier | 6 pages, 3 figures; needs style files svglov2.clo, svjour2.cls
(supplied). Presented at LIGHTCONE 2011, 23 - 27 May, 2011, Dallas, USA.
Accepted for publication in Few-Body Systems. In v2 name of second author in
[28] corrected. V3 is final version, published online 23. Sep 2011 | Few-Body Systems Volume 52, Issue 3-4 (2012) 415-420 | 10.1007/s00601-011-0257-2 | RUB-TPII-06/2011 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis of all available data (CELLO, CLEO, \babar) in the range $[1\div
40]$ GeV$^2$ for the pion-photon transition form factor in terms of light-cone
sum rules with next-to-leading-order accuracy is discussed, including
twist-four contributions and next-to-next-to-leading order and twist-six
corrections---the latter two via uncertainties. The antithetic trend between
the \babar data for the $\gamma^*\gamma\pi^0$ and those for the
$\gamma^*\gamma\eta(\eta')$ transition is pointed out, emphasizing the
underlying antagonistic mechanisms: endpoint enhancement for the first and
endpoint-suppression for the second---each associated with pseudoscalar meson
distribution amplitudes with distinct endpoint characteristics.
| [
{
"created": "Tue, 13 Sep 2011 09:33:06 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2011 13:21:11 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Sep 2011 10:35:17 GMT",
"version": "v3"
}
] | 2012-04-24 | [
[
"Stefanis",
"N. G.",
""
]
] | An analysis of all available data (CELLO, CLEO, \babar) in the range $[1\div 40]$ GeV$^2$ for the pion-photon transition form factor in terms of light-cone sum rules with next-to-leading-order accuracy is discussed, including twist-four contributions and next-to-next-to-leading order and twist-six corrections---the latter two via uncertainties. The antithetic trend between the \babar data for the $\gamma^*\gamma\pi^0$ and those for the $\gamma^*\gamma\eta(\eta')$ transition is pointed out, emphasizing the underlying antagonistic mechanisms: endpoint enhancement for the first and endpoint-suppression for the second---each associated with pseudoscalar meson distribution amplitudes with distinct endpoint characteristics. |
2108.04874 | Gl\`oria Monta\~na Faiget | Gloria Montana, Angels Ramos, Laura Tolos, and Juan M. Torres-Rincon | Temperature dependence of the properties of open heavy-flavor mesons | 4 pages, 4 figures, contribution to the proceedings for the 19th
International Conference on Strangeness in Quark Matter (SQM 2021), online
17-22 May 2021 (Submission to EPJ) | null | 10.1051/epjconf/202225912008 | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | We address the modification of open heavy-flavor mesons in a hot medium of
light mesons within an effective theory approach consistent with chiral and
heavy-quark spin-flavor symmetries and the use of the imaginary time formalism
to introduce the non-zero temperature effects to the theory. The unitarized
scattering amplitudes, the ground-state self-energies and the corresponding
spectral functions are calculated self-consistently. We use the thermal
ground-state spectral functions obtained with this methodology to further
calculate 1) open-charm meson Euclidean correlators, and 2) off-shell transport
coefficients in the hadronic phase.
| [
{
"created": "Tue, 10 Aug 2021 18:53:45 GMT",
"version": "v1"
}
] | 2022-02-16 | [
[
"Montana",
"Gloria",
""
],
[
"Ramos",
"Angels",
""
],
[
"Tolos",
"Laura",
""
],
[
"Torres-Rincon",
"Juan M.",
""
]
] | We address the modification of open heavy-flavor mesons in a hot medium of light mesons within an effective theory approach consistent with chiral and heavy-quark spin-flavor symmetries and the use of the imaginary time formalism to introduce the non-zero temperature effects to the theory. The unitarized scattering amplitudes, the ground-state self-energies and the corresponding spectral functions are calculated self-consistently. We use the thermal ground-state spectral functions obtained with this methodology to further calculate 1) open-charm meson Euclidean correlators, and 2) off-shell transport coefficients in the hadronic phase. |
hep-ph/9806219 | Misha Stephanov | M. Stephanov, K. Rajagopal and E. Shuryak | Signatures of the Tricritical Point in QCD | 5 pages (published version) | Phys.Rev.Lett. 81 (1998) 4816-4819 | 10.1103/PhysRevLett.81.4816 | ITP-SB-98-39, MIT-CTP-2748, SUNY-NTG-98-17 | hep-ph nucl-th | null | Several approaches to QCD with two massless quarks at finite temperature T
and baryon chemical potential mu suggest the existence of a tricritical point
on the boundary of the phase with spontaneously broken chiral symmetry. In QCD
with massive quarks there is then a critical point at the end of a first order
transition line. We discuss possible experimental signatures of this point,
which provide information about its location and properties. We propose a
combination of event-by-event observables, including suppressed fluctuations in
T and mu and, simultaneously, enhanced fluctuations in the multiplicity of soft
pions.
| [
{
"created": "Mon, 1 Jun 1998 22:15:40 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 1999 22:15:39 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Stephanov",
"M.",
""
],
[
"Rajagopal",
"K.",
""
],
[
"Shuryak",
"E.",
""
]
] | Several approaches to QCD with two massless quarks at finite temperature T and baryon chemical potential mu suggest the existence of a tricritical point on the boundary of the phase with spontaneously broken chiral symmetry. In QCD with massive quarks there is then a critical point at the end of a first order transition line. We discuss possible experimental signatures of this point, which provide information about its location and properties. We propose a combination of event-by-event observables, including suppressed fluctuations in T and mu and, simultaneously, enhanced fluctuations in the multiplicity of soft pions. |
hep-ph/9312320 | Dr. Ivica Picek | J.O. Eeg and I. Picek | New contribution to anomalous radiative $K^0$-decays | 13 p. | Phys.Lett. B323 (1994) 193-200 | 10.1016/0370-2693(94)90291-7 | Oslo TP 17-93 and Zagreb ZTF - 93/11 | hep-ph | null | We present a new contribution to the $K_L\rightarrow \gamma \gamma$
amplitude, which is ${\cal{O}}(p^4)$ within the counting rules of chiral
perturbation theory. This direct (non-pole) amplitude, obtained from
short-distance $s \rightarrow d \gamma$ quark diagrams of order $e G_F
\alpha_s/\pi$, and similar $s \rightarrow d \gamma \gamma$ diagrams, can
account for about half of the experimental amplitude. Closely following the
description of the $\pi ^0\rightarrow \gamma \gamma$ and $K_L\rightarrow \gamma
\gamma$ processes in the variants of the same low-energy QCD, we find that both
of these processes are anomalous in the same sense. Then, by the
anomaly-matching principle, we arrive from the chiral-quark to the bosonic
counterparts for both of these processes. In this way we add the
$K_L\rightarrow \gamma \gamma$ decay to the existing list of anomalous
radiative prosesses.
| [
{
"created": "Tue, 21 Dec 1993 11:30:39 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Eeg",
"J. O.",
""
],
[
"Picek",
"I.",
""
]
] | We present a new contribution to the $K_L\rightarrow \gamma \gamma$ amplitude, which is ${\cal{O}}(p^4)$ within the counting rules of chiral perturbation theory. This direct (non-pole) amplitude, obtained from short-distance $s \rightarrow d \gamma$ quark diagrams of order $e G_F \alpha_s/\pi$, and similar $s \rightarrow d \gamma \gamma$ diagrams, can account for about half of the experimental amplitude. Closely following the description of the $\pi ^0\rightarrow \gamma \gamma$ and $K_L\rightarrow \gamma \gamma$ processes in the variants of the same low-energy QCD, we find that both of these processes are anomalous in the same sense. Then, by the anomaly-matching principle, we arrive from the chiral-quark to the bosonic counterparts for both of these processes. In this way we add the $K_L\rightarrow \gamma \gamma$ decay to the existing list of anomalous radiative prosesses. |
1904.07175 | Luc\'ia Duarte | Luc\'ia Duarte, Javier Peressutti, Ismael Romero, Oscar A. Sampayo | Majorana neutrinos with effective interactions in B decays | 26 pages, 10 figures | Eur.Phys. J C (2019) 79: 593 | 10.1140/epjc/s10052-019-7104-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possible contribution of Majorana neutrinos to $B$ meson
decays in an effective interaction formalism, in the mass range $0.5$ GeV
$<m_N<5 $ GeV. We study the decay of the $B^-$ meson via $B^- \to \mu^- \mu^-
\pi^+$ at LHCb, which is a signal for leptonic number violation and the
presence of Majorana neutrinos, and put bounds on different new physics
contributions, characterized by their Dirac-Lorentz structure. We also study
the bounds imposed by the radiative $B$ decay ($B^- \rightarrow \mu^- \nu
\gamma$) results from Belle. The obtained bounds are more restrictive than
previous values found for dimension 6 four-fermion contact vectorial and scalar
Majorana neutrino interactions in the context of the Left-Right symmetric model
for higher Majorana masses at the LHC, showing that the direct calculation of
the effective $N$ interactions contribution to different processes can help to
put more stringent bounds to different UV-complete models parameterized by an
effective Lagrangian.
| [
{
"created": "Mon, 15 Apr 2019 16:44:59 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2019 18:01:10 GMT",
"version": "v2"
}
] | 2019-07-23 | [
[
"Duarte",
"Lucía",
""
],
[
"Peressutti",
"Javier",
""
],
[
"Romero",
"Ismael",
""
],
[
"Sampayo",
"Oscar A.",
""
]
] | We investigate the possible contribution of Majorana neutrinos to $B$ meson decays in an effective interaction formalism, in the mass range $0.5$ GeV $<m_N<5 $ GeV. We study the decay of the $B^-$ meson via $B^- \to \mu^- \mu^- \pi^+$ at LHCb, which is a signal for leptonic number violation and the presence of Majorana neutrinos, and put bounds on different new physics contributions, characterized by their Dirac-Lorentz structure. We also study the bounds imposed by the radiative $B$ decay ($B^- \rightarrow \mu^- \nu \gamma$) results from Belle. The obtained bounds are more restrictive than previous values found for dimension 6 four-fermion contact vectorial and scalar Majorana neutrino interactions in the context of the Left-Right symmetric model for higher Majorana masses at the LHC, showing that the direct calculation of the effective $N$ interactions contribution to different processes can help to put more stringent bounds to different UV-complete models parameterized by an effective Lagrangian. |
hep-ph/9805440 | Ulf-G. Meissner | Ulf-G. Mei{\ss}ner | Pion-nucleon scattering and isospin violation | 9 pp, LaTeX, uses psfig and sprocl.sty, 3 figs, invited talk,
workshop on "Future Directions in Quark-Nuclear Physics", Adelaide, March
1998 | null | null | FZJ-IKP(TH)-1998-11 | hep-ph nucl-th | null | I discuss low-energy pion-nucleon scattering in the framework of chiral
perturbation theory. I argue that using this theoretical method one is able to
handle the in some cases tremendous experimental accuracy (for the low partial
waves). I then show how strong and electromagnetic isospin violation can be
treated simultaneously. Some first results for neutral pion scattering and the
$\sigma$-term are given.
| [
{
"created": "Mon, 25 May 1998 07:09:05 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 1998 13:49:46 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Meißner",
"Ulf-G.",
""
]
] | I discuss low-energy pion-nucleon scattering in the framework of chiral perturbation theory. I argue that using this theoretical method one is able to handle the in some cases tremendous experimental accuracy (for the low partial waves). I then show how strong and electromagnetic isospin violation can be treated simultaneously. Some first results for neutral pion scattering and the $\sigma$-term are given. |
hep-ph/0610279 | Saleh Sultansoy | Saleh Sultansoy (Gazi University, Dept. of Physics, Ankara, Turkey and
Academy of Science, Institute of Physics, Baku, Azerbaijan) | Flavor Democracy in Particle Physics | Invited presentation at the Sixth International Conference of the
Balkan Physical Union (BPU-6), August 22-26, 2006, Istanbul, Turkey | AIPConf.Proc.899:49-52,2007 | 10.1063/1.2733040 | null | hep-ph hep-ex | null | The flavor democracy hypothesis was introduced in seventies taking in mind
three Standard Model (SM) families. Later, this idea was disfavored by the
large value of the t-quark mass. In nineties the hypothesis was revisited
assuming that extra SM families exist. According to flavor democracy the fourth
SM family should exist and there are serious arguments disfavoring the fifth SM
family. The fourth SM family quarks lead to essential enhancement of the Higgs
boson production cross-section at hadron colliders and the Tevatron can
discover the Higgs boson before the LHC, if it mass is between 140 and 200 GeV.
Then, one can handle "massless" Dirac neutrinos without see-saw mechanism.
Concerning BSM physics, flavor democracy leads to several consequences:
tan(beta) approx.eq. 40 if there are three MSSM families; super-partner of the
right-handed neutrino can be the LSP; relatively light E(6)-inspired isosinglet
quark etc. Finally, flavor democracy may give opportunity to handle "massless"
composite objects within preonic models.
| [
{
"created": "Sat, 21 Oct 2006 18:31:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sultansoy",
"Saleh",
"",
"Gazi University, Dept. of Physics, Ankara, Turkey and\n Academy of Science, Institute of Physics, Baku, Azerbaijan"
]
] | The flavor democracy hypothesis was introduced in seventies taking in mind three Standard Model (SM) families. Later, this idea was disfavored by the large value of the t-quark mass. In nineties the hypothesis was revisited assuming that extra SM families exist. According to flavor democracy the fourth SM family should exist and there are serious arguments disfavoring the fifth SM family. The fourth SM family quarks lead to essential enhancement of the Higgs boson production cross-section at hadron colliders and the Tevatron can discover the Higgs boson before the LHC, if it mass is between 140 and 200 GeV. Then, one can handle "massless" Dirac neutrinos without see-saw mechanism. Concerning BSM physics, flavor democracy leads to several consequences: tan(beta) approx.eq. 40 if there are three MSSM families; super-partner of the right-handed neutrino can be the LSP; relatively light E(6)-inspired isosinglet quark etc. Finally, flavor democracy may give opportunity to handle "massless" composite objects within preonic models. |
2312.16972 | Shao-Feng Ge | Shao-Feng Ge and Pedro Pasquini and Liang Tan | Neutrino Mass Measurement with Cosmic Gravitational Focusing | 41 pages, 6 figures, published JCAP version | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We thoroughly explore the cosmic gravitational focusing of cosmic neutrino
fluid (C$\nu$F) by dark matter (DM) halo using both general relativity for a
point source of gravitational potential and Boltzmann equations for continuous
overdensities. Derived in the general way for both relativistic and
non-relativistic neutrinos, our results show that the effect has fourth power
dependence on the neutrino mass and temperature. With nonlinear mass dependence
which is different from the cosmic microwave background (CMB) and large scale
structure (LSS) observations, the cosmic gravitational focusing can provide an
independent cosmological way of measuring the neutrino mass and ordering. We
take DESI as an example to illustrate that the projected sensitivity as well as
its synergy with existing terrestrial neutrino oscillation experiments and
other cosmological observations can significantly improve the neutrino mass
measurement.
| [
{
"created": "Thu, 28 Dec 2023 11:35:12 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2024 12:43:05 GMT",
"version": "v2"
}
] | 2024-07-08 | [
[
"Ge",
"Shao-Feng",
""
],
[
"Pasquini",
"Pedro",
""
],
[
"Tan",
"Liang",
""
]
] | We thoroughly explore the cosmic gravitational focusing of cosmic neutrino fluid (C$\nu$F) by dark matter (DM) halo using both general relativity for a point source of gravitational potential and Boltzmann equations for continuous overdensities. Derived in the general way for both relativistic and non-relativistic neutrinos, our results show that the effect has fourth power dependence on the neutrino mass and temperature. With nonlinear mass dependence which is different from the cosmic microwave background (CMB) and large scale structure (LSS) observations, the cosmic gravitational focusing can provide an independent cosmological way of measuring the neutrino mass and ordering. We take DESI as an example to illustrate that the projected sensitivity as well as its synergy with existing terrestrial neutrino oscillation experiments and other cosmological observations can significantly improve the neutrino mass measurement. |
2012.03633 | Hossein Mohseni Sadjadi | H. Mohseni Sadjadi, H. Yazdani Ahmadabadi | Damped Neutrino Oscillations in a Conformal Coupling Model | 24 pages, 11 figures, minor corrections, published in Physical Review
D | Phys. Rev. D 103, 065012 (2021) | 10.1103/PhysRevD.103.065012 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor transitions of Neutrinos with a nonstandard interaction are studied. A
scalar field is conformally coupled to matter and neutrinos. This interaction
alters the neutrino effective mass and its wavefunction leading to a damping
factor, causing deficits in the probability densities and affecting the
oscillation phase. As the matter density determines the scalar field's
behavior, we also have an indirect matter density effect on the flavor
conversion. We explain our results in the context of screening models and study
the deficit in the total flux of electron-neutrinos produced in the Sun through
the decay process and confront our results with observational data.
| [
{
"created": "Mon, 7 Dec 2020 12:26:19 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Mar 2021 10:31:34 GMT",
"version": "v2"
},
{
"created": "Sat, 22 May 2021 10:26:42 GMT",
"version": "v3"
}
] | 2021-05-25 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Ahmadabadi",
"H. Yazdani",
""
]
] | Flavor transitions of Neutrinos with a nonstandard interaction are studied. A scalar field is conformally coupled to matter and neutrinos. This interaction alters the neutrino effective mass and its wavefunction leading to a damping factor, causing deficits in the probability densities and affecting the oscillation phase. As the matter density determines the scalar field's behavior, we also have an indirect matter density effect on the flavor conversion. We explain our results in the context of screening models and study the deficit in the total flux of electron-neutrinos produced in the Sun through the decay process and confront our results with observational data. |
hep-ph/0703280 | Vadim Bednyakov | V.A.Bednyakov (LNP JINR), N.D.Giokaris (University of Athens),
A.V.Bednyakov (BLTP JINR) | On Higgs mass generation mechanism in the Standard Model | 43 pages, 2 figures, talk given at JINR ATLAS physics workshop | Phys.Part.Nucl.39:13-36,2008 | 10.1007/s11496-008-1002-9 | null | hep-ph | null | The mass-generation mechanism is the most urgent problem of the modern
particle physics. The discovery and study of the Higgs boson with the Large
Hadron Collider at CERN are the highest priority steps to solve the problem. In
this paper, the Standard Model Higgs mechanism of the elementary particle mass
generation is reviewed with pedagogical details. The discussion of the Higgs
quadric self-coupling \lambda parameter and the bounds to the Higgs boson mass
are presented. In particular, the unitarity, triviality, and stability
constraints on the Higgs boson mass are discussed. The generation of the finite
value for the \lambda parameter due to quantum corrections via effective
potential is illustrated. Some simple predictions for the top quark and the
Higgs boson masses are given when both the top Yukawa coupling and the Higgs
self-coupling \lambda are equal to 1.
| [
{
"created": "Tue, 27 Mar 2007 10:48:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bednyakov",
"V. A.",
"",
"LNP JINR"
],
[
"Giokaris",
"N. D.",
"",
"University of Athens"
],
[
"Bednyakov",
"A. V.",
"",
"BLTP JINR"
]
] | The mass-generation mechanism is the most urgent problem of the modern particle physics. The discovery and study of the Higgs boson with the Large Hadron Collider at CERN are the highest priority steps to solve the problem. In this paper, the Standard Model Higgs mechanism of the elementary particle mass generation is reviewed with pedagogical details. The discussion of the Higgs quadric self-coupling \lambda parameter and the bounds to the Higgs boson mass are presented. In particular, the unitarity, triviality, and stability constraints on the Higgs boson mass are discussed. The generation of the finite value for the \lambda parameter due to quantum corrections via effective potential is illustrated. Some simple predictions for the top quark and the Higgs boson masses are given when both the top Yukawa coupling and the Higgs self-coupling \lambda are equal to 1. |
1801.05821 | Mikko Laine | S. Biondini and M. Laine | Thermal dark matter co-annihilating with a strongly interacting scalar | 19 pages. v2: clarifications added, published version | JHEP 1804 (2018) 072 | 10.1007/JHEP04(2018)072 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently many investigations have considered Majorana dark matter
co-annihilating with bound states formed by a strongly interacting scalar
field. However only the gluon radiation contribution to bound state formation
and dissociation, which at high temperatures is subleading to soft 2->2
scatterings, has been included. Making use of a non-relativistic effective
theory framework and solving a plasma-modified Schrodinger equation, we address
the effect of soft 2->2 scatterings as well as the thermal dissociation of
bound states. We argue that the mass splitting between the Majorana and scalar
field has in general both a lower and an upper bound, and that the dark matter
mass scale can be pushed at least up to 5...6 TeV.
| [
{
"created": "Wed, 17 Jan 2018 19:01:25 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2018 11:48:24 GMT",
"version": "v2"
}
] | 2018-05-04 | [
[
"Biondini",
"S.",
""
],
[
"Laine",
"M.",
""
]
] | Recently many investigations have considered Majorana dark matter co-annihilating with bound states formed by a strongly interacting scalar field. However only the gluon radiation contribution to bound state formation and dissociation, which at high temperatures is subleading to soft 2->2 scatterings, has been included. Making use of a non-relativistic effective theory framework and solving a plasma-modified Schrodinger equation, we address the effect of soft 2->2 scatterings as well as the thermal dissociation of bound states. We argue that the mass splitting between the Majorana and scalar field has in general both a lower and an upper bound, and that the dark matter mass scale can be pushed at least up to 5...6 TeV. |
hep-ph/0406225 | Graeme Watt | A.D. Martin, M.G. Ryskin, G. Watt | Simultaneous QCD analysis of diffractive and inclusive DIS data | 11 pages, 3 figures. Version published as a Rapid Communication in
Phys. Rev. D | Phys.Rev.D70:091502,2004 | 10.1103/PhysRevD.70.091502 | IPPP-04-31, DCPT-04-62 | hep-ph | null | We perform a NLO QCD analysis of deep-inelastic scattering data, in which we
account for absorptive corrections. These corrections are determined from a
simultaneous analysis of diffractive deep-inelastic data. The absorptive
effects are found to enhance the size of the gluon distribution at small x,
such that a negative input gluon distribution at Q^2 = 1 GeV^2 is no longer
required. We discuss the problem that the gluon distribution is valence-like at
low scales, whereas the sea quark distribution grows with decreasing x. Our
study hints at the possible importance of power corrections for Q^2 \simeq 1--2
GeV^2.
| [
{
"created": "Mon, 21 Jun 2004 19:43:14 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Nov 2004 10:50:19 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Watt",
"G.",
""
]
] | We perform a NLO QCD analysis of deep-inelastic scattering data, in which we account for absorptive corrections. These corrections are determined from a simultaneous analysis of diffractive deep-inelastic data. The absorptive effects are found to enhance the size of the gluon distribution at small x, such that a negative input gluon distribution at Q^2 = 1 GeV^2 is no longer required. We discuss the problem that the gluon distribution is valence-like at low scales, whereas the sea quark distribution grows with decreasing x. Our study hints at the possible importance of power corrections for Q^2 \simeq 1--2 GeV^2. |
2310.00550 | Peihong Gu | Pei-Hong Gu | Ultralight Dirac neutrinos from nearly degenerate Higgs doublets | 5 pages. More clarifications on the related mirror symmetry are
added. Typos are corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two Higgs doublets respect a mirror symmetry with spontaneous violation so
that their vacuum expectation values can realize a small difference. Under this
symmetry, three newly introduced right-handed neutrinos rather than the
standard model fermions perform an odd transformation. Accordingly the neutrino
masses and the charged fermion masses respectively are proportional to the
difference and sum of the vacuum expectation values of two Higgs doublets. From
a phenomenological perspective, such nearly degenerate Higgs doublets with
large cancellation are equivalent to a Dirac seesaw mechanism with high
suppression.
| [
{
"created": "Sun, 1 Oct 2023 02:37:31 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Nov 2023 17:56:44 GMT",
"version": "v2"
}
] | 2023-11-03 | [
[
"Gu",
"Pei-Hong",
""
]
] | Two Higgs doublets respect a mirror symmetry with spontaneous violation so that their vacuum expectation values can realize a small difference. Under this symmetry, three newly introduced right-handed neutrinos rather than the standard model fermions perform an odd transformation. Accordingly the neutrino masses and the charged fermion masses respectively are proportional to the difference and sum of the vacuum expectation values of two Higgs doublets. From a phenomenological perspective, such nearly degenerate Higgs doublets with large cancellation are equivalent to a Dirac seesaw mechanism with high suppression. |
1402.6427 | Matthias Lutz F.M. | M.F.M. Lutz, D. Samart and Y. Yan | Combined large-N_c and heavy-quark operator analysis for the chiral
Lagrangian with charmed baryons | 34 pages - one table - corrections applied | null | 10.1103/PhysRevD.90.056006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The chiral $SU(3)$ Lagrangian with charmed baryons of spin $J^P=1/2^+$ and
$J^P=3/2^+$ is analyzed. We consider all counter terms that are relevant at
next-to-next-to-next-to-leading order (N$^3$LO) in a chiral extrapolation of
the charmed baryon masses. At N$^2$LO we find 16 low-energy parameters. There
are 3 mass parameters for the anti-triplet and the two sextet baryons, 6
parameters describing the meson-baryon vertices and 7 symmetry breaking
parameters. The heavy-quark spin symmetry predicts four sum rules for the
meson-baryon vertices and degenerate masses for the two baryon sextet fields.
Here a large-$N_c$ operator analysis at NLO suggests the relevance of one
further spin-symmetry breaking parameter. Going from N$^2$LO to N$^3$LO adds 17
chiral symmetry breaking parameters and 24 symmetry preserving parameters. For
the leading symmetry conserving two-body counter terms involving two baryon
fields and two Goldstone boson fields we find 36 terms. While the heavy-quark
spin symmetry leads to $36-16=20$ sum rules, an expansion in $1/N_c$ at
next-to-leading order (NLO) generates $36-7= 29$ parameter relations. A
combined expansion leaves 3 unknown parameters only. For the symmetry breaking
counter terms we find 17 terms, for which there are $17-9=8$ sum rules from the
heavy-quark spin symmetry and $17-5=12 $ sum rules from a $1/N_c$ expansion at
NLO.
| [
{
"created": "Wed, 26 Feb 2014 06:07:41 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jun 2014 04:32:27 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Lutz",
"M. F. M.",
""
],
[
"Samart",
"D.",
""
],
[
"Yan",
"Y.",
""
]
] | The chiral $SU(3)$ Lagrangian with charmed baryons of spin $J^P=1/2^+$ and $J^P=3/2^+$ is analyzed. We consider all counter terms that are relevant at next-to-next-to-next-to-leading order (N$^3$LO) in a chiral extrapolation of the charmed baryon masses. At N$^2$LO we find 16 low-energy parameters. There are 3 mass parameters for the anti-triplet and the two sextet baryons, 6 parameters describing the meson-baryon vertices and 7 symmetry breaking parameters. The heavy-quark spin symmetry predicts four sum rules for the meson-baryon vertices and degenerate masses for the two baryon sextet fields. Here a large-$N_c$ operator analysis at NLO suggests the relevance of one further spin-symmetry breaking parameter. Going from N$^2$LO to N$^3$LO adds 17 chiral symmetry breaking parameters and 24 symmetry preserving parameters. For the leading symmetry conserving two-body counter terms involving two baryon fields and two Goldstone boson fields we find 36 terms. While the heavy-quark spin symmetry leads to $36-16=20$ sum rules, an expansion in $1/N_c$ at next-to-leading order (NLO) generates $36-7= 29$ parameter relations. A combined expansion leaves 3 unknown parameters only. For the symmetry breaking counter terms we find 17 terms, for which there are $17-9=8$ sum rules from the heavy-quark spin symmetry and $17-5=12 $ sum rules from a $1/N_c$ expansion at NLO. |
1511.03537 | Federico Colecchia | Federico Colecchia | Data-driven estimation of neutral pileup particle multiplicity in
high-luminosity hadron collider environments | Accepted for publication in the Proceedings of the 21st International
Conference on Computing in High Energy and Nuclear Physics (CHEP2015) -
Okinawa, Japan | J. Phys.: Conf. Ser. 664 (2015) 072013 | 10.1088/1742-6596/664/7/072013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The upcoming operation regimes of the Large Hadron Collider are going to
place stronger requirements on the rejection of particles originating from
pileup, i.e. from interactions between other protons. For this reason, particle
weighting techniques have recently been proposed in order to subtract pileup at
the level of individual particles. We describe a choice of weights that, unlike
others that rely on particle proximity, exploits the particle-level kinematic
signatures of the high-energy scattering and of the pileup interactions. We
illustrate the use of the weights to estimate the number density of neutral
pileup particles inside individual events, and we elaborate on the
complementarity between ours and other methods. We conclude by suggesting the
idea of combining different sets of weights with a view to exploiting different
features of the underlying processes for improved pileup subtraction at higher
luminosity.
| [
{
"created": "Wed, 11 Nov 2015 15:41:47 GMT",
"version": "v1"
}
] | 2016-01-19 | [
[
"Colecchia",
"Federico",
""
]
] | The upcoming operation regimes of the Large Hadron Collider are going to place stronger requirements on the rejection of particles originating from pileup, i.e. from interactions between other protons. For this reason, particle weighting techniques have recently been proposed in order to subtract pileup at the level of individual particles. We describe a choice of weights that, unlike others that rely on particle proximity, exploits the particle-level kinematic signatures of the high-energy scattering and of the pileup interactions. We illustrate the use of the weights to estimate the number density of neutral pileup particles inside individual events, and we elaborate on the complementarity between ours and other methods. We conclude by suggesting the idea of combining different sets of weights with a view to exploiting different features of the underlying processes for improved pileup subtraction at higher luminosity. |
1708.07274 | Harleen Dahiya Dr. | Nisha Dhiman and Harleen Dahiya | Decay constants of pseudoscalar and vector $B$ and $D$ mesons in the
light-cone quark model | 17 pages, 4 figures, 6 tables. Matches with the version to appear in
EPJ Plus | Eur. Phys. J. Plus (2018) 133: 134 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the decay constants of the pseudoscalar and the vector $B$
and $D$ mesons in the framework of the light-cone quark model. We have applied
a variational method to the relativistic Hamiltonian with the Gaussian-type
trial wave function to obtain the values of the scale parameter $\beta$ in
different potential models. Furthermore, using the known values of the
constituent quark masses of $u$, $d$, $s$, $c$ and $b$ quarks, we have obtained
the numerical results for the decay constants. We have also compared our
results with the other theoretical calculations and the existing experimental
results. The present work predictions have many phenomenological applications
in the domain of $CP$ violation and also in the determination of the CKM matrix
elements.
| [
{
"created": "Thu, 24 Aug 2017 04:15:33 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Mar 2018 06:29:59 GMT",
"version": "v2"
}
] | 2018-04-04 | [
[
"Dhiman",
"Nisha",
""
],
[
"Dahiya",
"Harleen",
""
]
] | We have studied the decay constants of the pseudoscalar and the vector $B$ and $D$ mesons in the framework of the light-cone quark model. We have applied a variational method to the relativistic Hamiltonian with the Gaussian-type trial wave function to obtain the values of the scale parameter $\beta$ in different potential models. Furthermore, using the known values of the constituent quark masses of $u$, $d$, $s$, $c$ and $b$ quarks, we have obtained the numerical results for the decay constants. We have also compared our results with the other theoretical calculations and the existing experimental results. The present work predictions have many phenomenological applications in the domain of $CP$ violation and also in the determination of the CKM matrix elements. |
hep-ph/0407141 | Alex Gomes Dias | Alex G. Dias, R. Martinez, V. Pleitez | Concerning the Landau Pole in 3-3-1 Models | 17 pages, 1 figure, extended version | Eur.Phys.J. C39 (2005) 101-107 | 10.1140/epjc/s2004-02083-0 | null | hep-ph | null | Some 3-3-1 models predict the existence of a non-perturbative regime at the
TeV scale. We study in these models, and their supersymmetric extensions, the
energy at which the non-perturbative limit and a Landau-like pole arise. An
order of magnitude for the mass of the extra neutral vector boson, $Z^\prime$,
present in these models is also obtained.
| [
{
"created": "Mon, 12 Jul 2004 20:26:13 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 2004 14:13:02 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dias",
"Alex G.",
""
],
[
"Martinez",
"R.",
""
],
[
"Pleitez",
"V.",
""
]
] | Some 3-3-1 models predict the existence of a non-perturbative regime at the TeV scale. We study in these models, and their supersymmetric extensions, the energy at which the non-perturbative limit and a Landau-like pole arise. An order of magnitude for the mass of the extra neutral vector boson, $Z^\prime$, present in these models is also obtained. |
1210.1264 | Ivan Vitev | Ivan Vitev | Electroweak boson-tagged jet event asymmetries at the Large Hadron
Collider | 4 pages, 4 eps figures, Quark Matter 2012 proceedings | null | 10.1016/j.nuclphysa.2013.02.111 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tagged jet measurements provide a promising experimental channel to quantify
the similarities and differences in the mechanisms of jet production in
proton-proton and nucleus-nucleus collisions. We present the first calculation
of the transverse momentum asymmetry of $Z^0/\gamma^*$-tagged jet events and
the momentum imbalance of $\gamma$-tagged jet events in $\sqrt{s}=2.76$ TeV
reactions at the LHC. Our results combine the ${\cal O}(G_F\alpha_s^2)$, ${\cal
O}(G_F\alpha_s^2)$ perturbative cross sections with the radiative and
collisional processes that modify parton showers in the presence of dense QCD
matter. We find that strong asymmetry momentum and imbalance, respectively, are
generated in central Pb+Pb reactions that have little sensitivity to the
fluctuations of the underlying soft hadronic background. We present theoretical
model predictions for their shape and magnitude.
| [
{
"created": "Wed, 3 Oct 2012 23:56:09 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Vitev",
"Ivan",
""
]
] | Tagged jet measurements provide a promising experimental channel to quantify the similarities and differences in the mechanisms of jet production in proton-proton and nucleus-nucleus collisions. We present the first calculation of the transverse momentum asymmetry of $Z^0/\gamma^*$-tagged jet events and the momentum imbalance of $\gamma$-tagged jet events in $\sqrt{s}=2.76$ TeV reactions at the LHC. Our results combine the ${\cal O}(G_F\alpha_s^2)$, ${\cal O}(G_F\alpha_s^2)$ perturbative cross sections with the radiative and collisional processes that modify parton showers in the presence of dense QCD matter. We find that strong asymmetry momentum and imbalance, respectively, are generated in central Pb+Pb reactions that have little sensitivity to the fluctuations of the underlying soft hadronic background. We present theoretical model predictions for their shape and magnitude. |
1402.2012 | Boris Kopeliovich | B. Z. Kopeliovich, J. Nemchik, I. K. Potashnikova, and Ivan Schmidt | Quenching of high-pT hadrons: a non-energy-loss scenario | 13 pages, 11 figures. Invited talk presented by B.Z.K. at
International Conference on New Frontiers in Physics, Crete, 28 August - 5
September, 2013 | null | 10.1051/epjconf/20147100070 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A parton produced with a high transverse momentum in a hard collision is
regenerating its color field, intensively radiating gluons and losing energy.
This process cannot last long, if it ends up with production of a leading
hadron carrying the main fraction z_h of the initial parton momentum. So energy
conservation imposes severe constraints on the length scale of production of a
single hadron with high pT. As a result, the main reason for hadron quenching
observed in heavy ion collisions, is not energy loss, but attenuation of the
produced colorless dipole in the created dense medium. The latter mechanism,
calculated with the path-integral method, explains well the observed
suppression of light hadrons and the elliptic flow in a wide range of energies,
from the lowest energy of RHIC up to LHC, and in a wide range of transverse
momenta. The values of the transport coefficient extracted from data range
within 1-2 GeV^2/fm, dependent on energy, and agree well with the theoretical
expectations.
| [
{
"created": "Mon, 10 Feb 2014 01:19:02 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Nemchik",
"J.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | A parton produced with a high transverse momentum in a hard collision is regenerating its color field, intensively radiating gluons and losing energy. This process cannot last long, if it ends up with production of a leading hadron carrying the main fraction z_h of the initial parton momentum. So energy conservation imposes severe constraints on the length scale of production of a single hadron with high pT. As a result, the main reason for hadron quenching observed in heavy ion collisions, is not energy loss, but attenuation of the produced colorless dipole in the created dense medium. The latter mechanism, calculated with the path-integral method, explains well the observed suppression of light hadrons and the elliptic flow in a wide range of energies, from the lowest energy of RHIC up to LHC, and in a wide range of transverse momenta. The values of the transport coefficient extracted from data range within 1-2 GeV^2/fm, dependent on energy, and agree well with the theoretical expectations. |
hep-ph/9612297 | Thomas Weigl | L. Mankiewicz, A.Saalfeld, T. Weigl (TU Munich) | On the analytical approximation to the GLAP evolution at small x and
moderate Q^2 | LaTeX, 13 pages including 6 figures, figure 5 replaced, to appear in
Phys. Lett. B | Phys.Lett.B393:175-180,1997 | 10.1016/S0370-2693(96)01615-2 | TUM/T39-96-25 | hep-ph | null | Comparing the numerically evaluated solution to the leading order GLAP
equations with its analytical small-x approximation we have found that in the
domain covered by a large fraction of the HERA data the analytic approximation
has to be augmented by the formally non-leading term which has been usually
neglected. The corrected formula fits the data much better and provides a
natural explanation of some of the deviations from the $\sigma$ scaling
observed in the HERA kinematical range.
| [
{
"created": "Mon, 9 Dec 1996 13:20:43 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 1996 16:11:55 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Mankiewicz",
"L.",
"",
"TU Munich"
],
[
"Saalfeld",
"A.",
"",
"TU Munich"
],
[
"Weigl",
"T.",
"",
"TU Munich"
]
] | Comparing the numerically evaluated solution to the leading order GLAP equations with its analytical small-x approximation we have found that in the domain covered by a large fraction of the HERA data the analytic approximation has to be augmented by the formally non-leading term which has been usually neglected. The corrected formula fits the data much better and provides a natural explanation of some of the deviations from the $\sigma$ scaling observed in the HERA kinematical range. |
hep-ph/0609228 | Martti Raidal | Thomas Hambye, Kristjan Kannike, Ernest Ma, and Martti Raidal | Emanations of Dark Matter: Muon Anomalous Magnetic Moment, Radiative
Neutrino Mass, and Novel Leptogenesis at the TeV Scale | 12 pages, 3 figures | Phys.Rev.D75:095003,2007 | 10.1103/PhysRevD.75.095003 | UCRHEP-T419 | hep-ph | null | The evidence for dark matter signals a new class of particles at the TeV
scale, which may manifest themselves indirectly through loop effects. In a
simple model we show that these loop effects may be responsible for the
enhanced muon anomalous magnetic moment, for the neutrino mass, as well as for
leptogenesis in a novel way. This scenario can be verified at LHC experiments.
| [
{
"created": "Fri, 22 Sep 2006 05:28:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hambye",
"Thomas",
""
],
[
"Kannike",
"Kristjan",
""
],
[
"Ma",
"Ernest",
""
],
[
"Raidal",
"Martti",
""
]
] | The evidence for dark matter signals a new class of particles at the TeV scale, which may manifest themselves indirectly through loop effects. In a simple model we show that these loop effects may be responsible for the enhanced muon anomalous magnetic moment, for the neutrino mass, as well as for leptogenesis in a novel way. This scenario can be verified at LHC experiments. |
1202.2533 | Jorge Casalderrey-Solana | Jorge Casalderrey-Solana and David Mateos | Off-diagonal Flavour Susceptibilities from AdS/CFT | 4 pages | null | 10.1007/JHEP08(2012)165 | ICCUB-12-075 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study flavour susceptibilities in the ${\cal N}=4$ SU(N) super Yang-Mills
plasma coupled to two quark flavours at strong coupling and large $N$ by means
of its gravity dual. The off-diagonal susceptibility is 1/N-suppressed and we
compute it as a one-loop effect on the gravity side. Contrary to naive
extrapolation from perturbative results, it attains a finite value in the
infinite-coupling limit. Moreover, its parametric form is independent of
whether or not meson bound states exist in the plasma. We conclude that caution
must be exercised when drawing conclusions about the QCD plasma from lattice
calculations of quark susceptibilities.
| [
{
"created": "Sun, 12 Feb 2012 15:02:51 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Casalderrey-Solana",
"Jorge",
""
],
[
"Mateos",
"David",
""
]
] | We study flavour susceptibilities in the ${\cal N}=4$ SU(N) super Yang-Mills plasma coupled to two quark flavours at strong coupling and large $N$ by means of its gravity dual. The off-diagonal susceptibility is 1/N-suppressed and we compute it as a one-loop effect on the gravity side. Contrary to naive extrapolation from perturbative results, it attains a finite value in the infinite-coupling limit. Moreover, its parametric form is independent of whether or not meson bound states exist in the plasma. We conclude that caution must be exercised when drawing conclusions about the QCD plasma from lattice calculations of quark susceptibilities. |
2211.15726 | Rome Samanta | Debasish Borah, Suruj Jyoti Das, Rome Samanta and Federico R. Urban | PBH-infused seesaw origin of matter and unique gravitational waves | 16 pages (one column), 5 figures, footnote-3 extended. Matches the
JHEP version | JHEP03(2023)127 | 10.1007/JHEP03(2023)127 | null | hep-ph astro-ph.CO | http://creativecommons.org/publicdomain/zero/1.0/ | The Standard Model, extended with three right-handed (RH) neutrinos, is the
simplest model that can explain light neutrino masses, the baryon asymmetry of
the Universe, and dark matter (DM). Models in which RH neutrinos are light are
generally easier to test in experiments. In this work, we show that, even if
the RH neutrinos are super-heavy ($M_{i=1,2,3}>10^9$ GeV) -- close to the Grand
Unification scale -- the model can be tested thanks to its distinct features on
the stochastic Gravitational Wave (GW) background. We consider an early
Universe filled with ultralight primordial black holes (PBH) that produce a
super-heavy RH neutrino DM via Hawking radiation. The other pair of RH
neutrinos generates the baryon asymmetry via thermal leptogenesis, much before
the PBHs evaporate. GW interferometers can test this novel spectrum of masses
thanks to the GWs induced by the PBH density fluctuations. In a more refined
version, wherein a $U(1)$ gauge symmetry breaking dynamically generates the
seesaw scale, the PBHs also cause observable spectral distortions on the GWs
from the $U(1)$-breaking cosmic strings. Thence, a low-frequency GW feature
related to DM genesis and detectable with a pulsar-timing array must correspond
to a mid- or high-frequency GW signature related to baryogenesis at
interferometer scales.
| [
{
"created": "Mon, 28 Nov 2022 19:25:21 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2023 19:28:14 GMT",
"version": "v2"
}
] | 2023-03-21 | [
[
"Borah",
"Debasish",
""
],
[
"Das",
"Suruj Jyoti",
""
],
[
"Samanta",
"Rome",
""
],
[
"Urban",
"Federico R.",
""
]
] | The Standard Model, extended with three right-handed (RH) neutrinos, is the simplest model that can explain light neutrino masses, the baryon asymmetry of the Universe, and dark matter (DM). Models in which RH neutrinos are light are generally easier to test in experiments. In this work, we show that, even if the RH neutrinos are super-heavy ($M_{i=1,2,3}>10^9$ GeV) -- close to the Grand Unification scale -- the model can be tested thanks to its distinct features on the stochastic Gravitational Wave (GW) background. We consider an early Universe filled with ultralight primordial black holes (PBH) that produce a super-heavy RH neutrino DM via Hawking radiation. The other pair of RH neutrinos generates the baryon asymmetry via thermal leptogenesis, much before the PBHs evaporate. GW interferometers can test this novel spectrum of masses thanks to the GWs induced by the PBH density fluctuations. In a more refined version, wherein a $U(1)$ gauge symmetry breaking dynamically generates the seesaw scale, the PBHs also cause observable spectral distortions on the GWs from the $U(1)$-breaking cosmic strings. Thence, a low-frequency GW feature related to DM genesis and detectable with a pulsar-timing array must correspond to a mid- or high-frequency GW signature related to baryogenesis at interferometer scales. |
1806.10932 | Barbara Pasquini | B. Pasquini (1, 2) and S. Rodini (1, 2) ((1) Pavia U., (2) INFN,
Pavia) | The twist-three distribution $e^q(x,k_\perp)$ in a light-front model | 15 pages; 5 figures; 2 tables | Phys. Lett. B788 (2019) 414-424 | 10.1016/j.physletb.2018.11.033 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the twist-three, unpolarized, chiral-odd, transverse momentum
dependent parton distribution (TMD) $e^q(x,k_\perp)$ within a light-front
model. We review a model-independent decomposition of this TMD, which follows
from the QCD equations of motion and is given in terms of a leading-twist mass
term, a pure interaction-dependent contribution, and singular terms. The
leading-twist and pure twist-three terms are represented in terms of overlap of
light-front wave functions (LFWFs), taking into account the Fock states with
three valence quark ($3q$) and three-quark plus one gluon ($3q+g$). The $3q$
and $3q+g$ LFWFs with total orbital angular momentum zero are modeled using a
parametrization derived from the conformal expansion of the proton distribution
amplitudes, with parameters fitted to reproduce available phenomenological
information on the unpolarized leading-twist quark and gluon collinear parton
distributions. Numerical predictions for both the quark TMD $e^q(x,k_\perp)$
and the collinear parton distribution $e^q(x)$ are presented, discussing the
role of the quark-gluon correlations in the proton.
| [
{
"created": "Thu, 28 Jun 2018 13:02:56 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2018 16:17:40 GMT",
"version": "v2"
}
] | 2018-12-06 | [
[
"Pasquini",
"B.",
""
],
[
"Rodini",
"S.",
""
]
] | We discuss the twist-three, unpolarized, chiral-odd, transverse momentum dependent parton distribution (TMD) $e^q(x,k_\perp)$ within a light-front model. We review a model-independent decomposition of this TMD, which follows from the QCD equations of motion and is given in terms of a leading-twist mass term, a pure interaction-dependent contribution, and singular terms. The leading-twist and pure twist-three terms are represented in terms of overlap of light-front wave functions (LFWFs), taking into account the Fock states with three valence quark ($3q$) and three-quark plus one gluon ($3q+g$). The $3q$ and $3q+g$ LFWFs with total orbital angular momentum zero are modeled using a parametrization derived from the conformal expansion of the proton distribution amplitudes, with parameters fitted to reproduce available phenomenological information on the unpolarized leading-twist quark and gluon collinear parton distributions. Numerical predictions for both the quark TMD $e^q(x,k_\perp)$ and the collinear parton distribution $e^q(x)$ are presented, discussing the role of the quark-gluon correlations in the proton. |
hep-ph/9910275 | Konstantin Matchev | Regina Demina (Kansas State U.), Joseph D. Lykken, Konstantin T.
Matchev (Fermilab) and Andrei Nomerotski (Florida U.) | Stop and Sbottom Searches in Run II of the Fermilab Tevatron | 30 pages, LaTeX, 10 figures | Phys.Rev.D62:035011,2000 | 10.1103/PhysRevD.62.035011 | FERMILAB-PUB-99/259-T | hep-ph hep-ex | null | We estimate the Tevatron Run II potential for top and bottom squark searches.
We find an impressive reach in several of the possible discovery channels. We
also study some new channels which may arise in non-conventional supersymmetry
models. In each case we rely on a detailed Monte Carlo simulation of the
collider events and the CDF detector performance in Run I.
| [
{
"created": "Fri, 8 Oct 1999 20:49:19 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Demina",
"Regina",
"",
"Kansas State U."
],
[
"Lykken",
"Joseph D.",
"",
"Fermilab"
],
[
"Matchev",
"Konstantin T.",
"",
"Fermilab"
],
[
"Nomerotski",
"Andrei",
"",
"Florida U."
]
] | We estimate the Tevatron Run II potential for top and bottom squark searches. We find an impressive reach in several of the possible discovery channels. We also study some new channels which may arise in non-conventional supersymmetry models. In each case we rely on a detailed Monte Carlo simulation of the collider events and the CDF detector performance in Run I. |
2210.01501 | Xiaoyu Lai | Xiaoyu Lai, Chengjun Xia, Renxin Xu | Bulk Strong Matter: the Trinity | 12 pages, 2 figures. Accepted by Advances in Physics: X | ADVANCES IN PHYSICS: X (2023) VOL. 8, NO. 1, 2137433 | 10.1080/23746149.2022.2137433 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our world is wonderful because of the normal but negligibly small baryonic
part (i.e., atoms) although unknown dark matter and dark energy dominate the
Universe. A stable atomic nucleus could be simply termed as ``strong matter''
since its nature is dominated by the fundamental strong interaction. Is there
any other form of strong matter? Although nuclei are composed of 2-flavoured
(i.e., up and down flavours of valence quarks) nucleons, it is conjectured that
bulk strong matter could be 3-flavoured (with additional strange quarks) if the
baryon number exceeds the critical value, $A_{\rm c}$, in which case quarks
could be either free (so-called strange quark matter) or localized (in
strangeons, coined by combining ``strange nucleon''). Bulk strong matter could
be manifested in the form of compact stars, cosmic rays, and even dark matter.
This trinity will be explained in this brief review, that may impact
dramatically on today's physics, particularly in the era of multi-messenger
astronomy after the discovery of gravitational wave.
| [
{
"created": "Tue, 4 Oct 2022 10:12:41 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Nov 2022 12:20:17 GMT",
"version": "v2"
}
] | 2022-11-08 | [
[
"Lai",
"Xiaoyu",
""
],
[
"Xia",
"Chengjun",
""
],
[
"Xu",
"Renxin",
""
]
] | Our world is wonderful because of the normal but negligibly small baryonic part (i.e., atoms) although unknown dark matter and dark energy dominate the Universe. A stable atomic nucleus could be simply termed as ``strong matter'' since its nature is dominated by the fundamental strong interaction. Is there any other form of strong matter? Although nuclei are composed of 2-flavoured (i.e., up and down flavours of valence quarks) nucleons, it is conjectured that bulk strong matter could be 3-flavoured (with additional strange quarks) if the baryon number exceeds the critical value, $A_{\rm c}$, in which case quarks could be either free (so-called strange quark matter) or localized (in strangeons, coined by combining ``strange nucleon''). Bulk strong matter could be manifested in the form of compact stars, cosmic rays, and even dark matter. This trinity will be explained in this brief review, that may impact dramatically on today's physics, particularly in the era of multi-messenger astronomy after the discovery of gravitational wave. |
1105.2139 | Thorsten Feldmann | Thorsten Feldmann (IPPP, Univ. Durham) | Lepton Flavour Violation Theory | 8 pages, contribution to the proceedings of "The 13th International
Conference on B-Physics at Hadron Machines" (April 2011), Amsterdam | null | null | Durham IPPP/11/22, DCPT/11/44 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss theoretical and phenomenological aspects of flavour violation in
charged lepton transitions. This includes minimal extensions of the Standard
Model within effective-theory approaches, as well as an incomplete selection of
concrete new physics models.
| [
{
"created": "Wed, 11 May 2011 09:31:44 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Feldmann",
"Thorsten",
"",
"IPPP, Univ. Durham"
]
] | I discuss theoretical and phenomenological aspects of flavour violation in charged lepton transitions. This includes minimal extensions of the Standard Model within effective-theory approaches, as well as an incomplete selection of concrete new physics models. |
hep-ph/9712443 | Beatriz de Carlos | T. Barreiro, B. de Carlos and E.J. Copeland (Sussex) | On non-perturbative corrections to the Kahler potential | 11 pages, LaTex, uses psfig.sty with 4 figures | Phys.Rev. D57 (1998) 7354-7360 | 10.1103/PhysRevD.57.7354 | SUSX-TH-97-024, IEM-FT-169/97 | hep-ph hep-th | null | We present the results of a detailed investigation into the consequences of
adding specific string motivated non-perturbative corrections to the usual tree
level Kahler potential in dilaton dominated scenarios. The success of the model
is judged through our ability to obtain a realistic VEV for the dilaton < Re S
> ~ 2, corresponding to the true minima of the scalar potential and being
associated with a reasonable value for the SUSY breaking scale via the
gravitino mass. The status of the so-called moduli problem is also reviewed in
each of the ansatze studied. Those include previous proposals made in the
context of both the chiral and the linear multiplet formalisms to describe
gaugino condensation, and a new ansatz which shows explicitly the equivalence
between the two.
| [
{
"created": "Thu, 18 Dec 1997 19:19:36 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Barreiro",
"T.",
"",
"Sussex"
],
[
"de Carlos",
"B.",
"",
"Sussex"
],
[
"Copeland",
"E. J.",
"",
"Sussex"
]
] | We present the results of a detailed investigation into the consequences of adding specific string motivated non-perturbative corrections to the usual tree level Kahler potential in dilaton dominated scenarios. The success of the model is judged through our ability to obtain a realistic VEV for the dilaton < Re S > ~ 2, corresponding to the true minima of the scalar potential and being associated with a reasonable value for the SUSY breaking scale via the gravitino mass. The status of the so-called moduli problem is also reviewed in each of the ansatze studied. Those include previous proposals made in the context of both the chiral and the linear multiplet formalisms to describe gaugino condensation, and a new ansatz which shows explicitly the equivalence between the two. |
1009.4939 | Sheldon Stone | Sheldon Stone | S-waves and the extraction of beta_s | Invited talk presented at Flavor Physics and CP Violation 2010, May
2010, Torino, Italy; to appear in proceedings. 6 pages 4 figures | PoS FPCP2010:011,2010 | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CP Violating asymmetry in Bs mixing (beta_s) is one of the most promising
measurements where physics beyond the Standard Model could be revealed. As
such, analyses need to be subjected to great scrutiny. The mode Bs -> J/psi\phi
has been used, and the mode Bs -> \phi \phi proposed for future measurements.
These modes both have two vector particles in the final state and thus angular
analyses must be used to disentangle the contributions from CP+ and CP-
configurations. The angular distributions, however, could be distorted by the
presence of S-waves masquerading as low mass K+K- pairs, that could result in
erroneous values of beta_s. The S-waves could well be the result of a final
state formed from an s-quark anti-s-quark pair in a 0+ spin-parity state, such
as the f0(980) meson. Data driven and theoretical estimates of the Bs decay
rate into the CP+ final state J/psi f0(980) are given, when f0 -> pi+pi-. The
S-wave contribution in J\psi\phi should be taken into account when determining
beta_s by including a K+K- S-wave amplitude in the fit. This may change the
central value of current results and will also increase the statistical
uncertainty. Importantly, the J/psi f0(980) mode has been suggested as an
alternative channel for measuring beta_s.
| [
{
"created": "Fri, 24 Sep 2010 20:11:26 GMT",
"version": "v1"
}
] | 2011-04-08 | [
[
"Stone",
"Sheldon",
""
]
] | The CP Violating asymmetry in Bs mixing (beta_s) is one of the most promising measurements where physics beyond the Standard Model could be revealed. As such, analyses need to be subjected to great scrutiny. The mode Bs -> J/psi\phi has been used, and the mode Bs -> \phi \phi proposed for future measurements. These modes both have two vector particles in the final state and thus angular analyses must be used to disentangle the contributions from CP+ and CP- configurations. The angular distributions, however, could be distorted by the presence of S-waves masquerading as low mass K+K- pairs, that could result in erroneous values of beta_s. The S-waves could well be the result of a final state formed from an s-quark anti-s-quark pair in a 0+ spin-parity state, such as the f0(980) meson. Data driven and theoretical estimates of the Bs decay rate into the CP+ final state J/psi f0(980) are given, when f0 -> pi+pi-. The S-wave contribution in J\psi\phi should be taken into account when determining beta_s by including a K+K- S-wave amplitude in the fit. This may change the central value of current results and will also increase the statistical uncertainty. Importantly, the J/psi f0(980) mode has been suggested as an alternative channel for measuring beta_s. |
1607.00810 | Santosh Kumar Rai | Kasinath Das, Tianjun Li, S. Nandi, Santosh Kumar Rai | A new proposal for diphoton resonance from $E_6$ motivated extra $U(1)$ | 19 pages, 12 eps figures | null | null | HRI-RECAPP-2016-010, OSU-HEP-16-05 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that the diphoton resonance signal indicated by the recent LHC
data might also arise from the pair productions of vector-like heavy down-type
quarks with mass around $750$ GeV and above. The vector-like quark decays into
an ordinary light quark and a Standard Model singlet scalar. The subsequent
decay of scalar singlet produces the diphoton excess. Both the vector-like
quark and singlet scalars appear naturally in the $E_6$, and their masses can
be in the TeV scale with a suitable choice of symmetry breaking pattern. The
prediction of such a proposal would be to see an accompanying dijet signal at
the same mass with similar cross section in the $2\gamma + 2j$ final state and
two dijet resonances at the same mass for a $4j$ final state with a cross
section, about 100 times larger. Both predictions can be tested easily as the
luminosity accumulates in the upcoming runs of the LHC.
| [
{
"created": "Mon, 4 Jul 2016 10:26:42 GMT",
"version": "v1"
}
] | 2016-07-05 | [
[
"Das",
"Kasinath",
""
],
[
"Li",
"Tianjun",
""
],
[
"Nandi",
"S.",
""
],
[
"Rai",
"Santosh Kumar",
""
]
] | We propose that the diphoton resonance signal indicated by the recent LHC data might also arise from the pair productions of vector-like heavy down-type quarks with mass around $750$ GeV and above. The vector-like quark decays into an ordinary light quark and a Standard Model singlet scalar. The subsequent decay of scalar singlet produces the diphoton excess. Both the vector-like quark and singlet scalars appear naturally in the $E_6$, and their masses can be in the TeV scale with a suitable choice of symmetry breaking pattern. The prediction of such a proposal would be to see an accompanying dijet signal at the same mass with similar cross section in the $2\gamma + 2j$ final state and two dijet resonances at the same mass for a $4j$ final state with a cross section, about 100 times larger. Both predictions can be tested easily as the luminosity accumulates in the upcoming runs of the LHC. |
1910.03272 | Danny Marfatia | Tao Han, Jiajun Liao, Hongkai Liu, Danny Marfatia | Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC | 21 pages, 5 figures, 1 table. Published version | JHEP 1911:028 (2019) | 10.1007/JHEP11(2019)028 | PITT-PACC-1815 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how nonstandard neutrino interactions (NSI) may be probed by a
combination of coherent elastic neutrino-nucleus scattering, neutrino
oscillation and collider data, from COHERENT, DUNE, T2HK and the
high-luminosity (HL) LHC. We focus on NSI induced by a new flavored gauge boson
$Z'$ in a generic anomaly-free ultraviolet-complete model. For $Z'$ masses
above 10 GeV, the HL-LHC has the best sensitivity regardless of the flavor
structure of the model. For masses between 0.01 GeV-10 GeV, current LHCb data
and future COHERENT data have the best sensitivity unless the $Z'$ couplings to
the first and second generation leptons are suppressed, in which case DUNE and
T2HK have the best sensitivity. For $Z'$ masses between about 5 MeV-20 MeV,
DUNE and T2HK have the best sensitivity. We also show how joint analyses of
COHERENT and LHC data may constrain such models.
| [
{
"created": "Tue, 8 Oct 2019 08:42:12 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2019 08:09:49 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Nov 2019 02:32:44 GMT",
"version": "v3"
}
] | 2019-11-13 | [
[
"Han",
"Tao",
""
],
[
"Liao",
"Jiajun",
""
],
[
"Liu",
"Hongkai",
""
],
[
"Marfatia",
"Danny",
""
]
] | We study how nonstandard neutrino interactions (NSI) may be probed by a combination of coherent elastic neutrino-nucleus scattering, neutrino oscillation and collider data, from COHERENT, DUNE, T2HK and the high-luminosity (HL) LHC. We focus on NSI induced by a new flavored gauge boson $Z'$ in a generic anomaly-free ultraviolet-complete model. For $Z'$ masses above 10 GeV, the HL-LHC has the best sensitivity regardless of the flavor structure of the model. For masses between 0.01 GeV-10 GeV, current LHCb data and future COHERENT data have the best sensitivity unless the $Z'$ couplings to the first and second generation leptons are suppressed, in which case DUNE and T2HK have the best sensitivity. For $Z'$ masses between about 5 MeV-20 MeV, DUNE and T2HK have the best sensitivity. We also show how joint analyses of COHERENT and LHC data may constrain such models. |
hep-ph/9406274 | Dirk Graudenz | Dirk Graudenz | One-Particle Inclusive Processes in Deeply Inelastic Lepton-Nucleon
Scattering | 20 pages (LaTex) + 4 pages of figures appended in the end of the file
as a uuencoded postscript file, CERN-TH.7300/94 | Nucl.Phys. B432 (1994) 351-376 | 10.1016/0550-3213(94)90606-8 | null | hep-ph | null | The one-particle inclusive cross section in deeply inelastic lepton--nucleon
scattering, expressed in terms of parton densities and fragmentation functions
being differential in the invariant mass of the observed hadron and of the
incoming nucleon, diverges if this invariant mass vanishes. This divergence can
be traced back to the kinematical configuration where the parent parton of the
observed hadron is emitted collinearly from the incoming parton of the QCD
subprocess. By using the concept of ``fracture functions'', which has recently
been introduced by Trentadue and Veneziano, it is possible to absorb this
divergence in these new distribution functions as long as the observed hadron
is not soft. This procedure allows the determination of a finite one-particle
inclusive cross section in next-to-leading order QCD perturbation theory. We
give details of the calculation and the explicit form of the bare fracture
functions in terms of the renormalized ones.
| [
{
"created": "Fri, 10 Jun 1994 10:03:58 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Graudenz",
"Dirk",
""
]
] | The one-particle inclusive cross section in deeply inelastic lepton--nucleon scattering, expressed in terms of parton densities and fragmentation functions being differential in the invariant mass of the observed hadron and of the incoming nucleon, diverges if this invariant mass vanishes. This divergence can be traced back to the kinematical configuration where the parent parton of the observed hadron is emitted collinearly from the incoming parton of the QCD subprocess. By using the concept of ``fracture functions'', which has recently been introduced by Trentadue and Veneziano, it is possible to absorb this divergence in these new distribution functions as long as the observed hadron is not soft. This procedure allows the determination of a finite one-particle inclusive cross section in next-to-leading order QCD perturbation theory. We give details of the calculation and the explicit form of the bare fracture functions in terms of the renormalized ones. |
1007.3832 | Shingo Kobayashi | Shingo Kobayashi. Michikazu Kobayashi, Yuki Kawaguchi, Muneto Nitta,
and Masahito Ueda | Topological Influence between Monopoles and Vortices: a Possible
Resolution of the Monopole Problem | 4 pages, 3 figures | null | null | null | hep-ph astro-ph.CO cond-mat.other hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Grand unified theories of fundamental forces predict that magnetic monopoles
are inevitable in the Universe because the second homotopy group of the order
parameter manifold is $\mathbb{Z}$. We point out that monopoles can annihilate
in pairs due to an influence of Alice strings. As a consequence, a monopole
charge is charactarized by $\mathbb{Z}_2$ rather than $\mathbb{Z}$ if the
Universe can accommodate Alice strings, which is the case of certain grand
unified theories.
| [
{
"created": "Thu, 22 Jul 2010 09:10:48 GMT",
"version": "v1"
}
] | 2010-07-29 | [
[
"Kobayashi",
"Shingo Kobayashi. Michikazu",
""
],
[
"Kawaguchi",
"Yuki",
""
],
[
"Nitta",
"Muneto",
""
],
[
"Ueda",
"Masahito",
""
]
] | Grand unified theories of fundamental forces predict that magnetic monopoles are inevitable in the Universe because the second homotopy group of the order parameter manifold is $\mathbb{Z}$. We point out that monopoles can annihilate in pairs due to an influence of Alice strings. As a consequence, a monopole charge is charactarized by $\mathbb{Z}_2$ rather than $\mathbb{Z}$ if the Universe can accommodate Alice strings, which is the case of certain grand unified theories. |
hep-ph/0408265 | Raymond F. Sawyer | R. F. Sawyer | "Classical" instabilities and "quantum" speed-up in the evolution of
neutrino clouds | 12 pages, 4 figures | null | null | null | hep-ph | null | We study some examples of collective behavior in neutrino clouds governed by
the neutral-current neutrino-neutrino interaction. The standard equations for
analyzing such systems are rederived in a two-step process: first, a
replacement of the full interaction Hamiltonian with a "forward" Hamiltonian
that contains only the momentum states that were initially occupied by a
neutrino of one flavor or another; second, a factorization assumption that
reduces the time evolution problem to the solution of coupled equations for the
expectations of various bilinear forms in the neutrino fields. We designate the
latter as the "classical" equations. We analyze some solutions of these
equations in cases in which the initial momentum and flavor distributions of
neutrinos are strongly anisotropic in space. In some cases we find an
instability that leads to rapid evolution of the flavor-angle distribution,
even when it is seeded by a very small initial flavor mixing (or alternatively
by a very small neutrino mass$^2$ term). Turning to the more complete case in
which we do not assume the classical factorization, but instead solve for the
evolution under the influence of the full "forward" Hamiltonian, we find the
possibility of rapid evolution, under our definition, even when there is no
seeding from conventional neutrino mixing.
| [
{
"created": "Tue, 24 Aug 2004 21:56:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sawyer",
"R. F.",
""
]
] | We study some examples of collective behavior in neutrino clouds governed by the neutral-current neutrino-neutrino interaction. The standard equations for analyzing such systems are rederived in a two-step process: first, a replacement of the full interaction Hamiltonian with a "forward" Hamiltonian that contains only the momentum states that were initially occupied by a neutrino of one flavor or another; second, a factorization assumption that reduces the time evolution problem to the solution of coupled equations for the expectations of various bilinear forms in the neutrino fields. We designate the latter as the "classical" equations. We analyze some solutions of these equations in cases in which the initial momentum and flavor distributions of neutrinos are strongly anisotropic in space. In some cases we find an instability that leads to rapid evolution of the flavor-angle distribution, even when it is seeded by a very small initial flavor mixing (or alternatively by a very small neutrino mass$^2$ term). Turning to the more complete case in which we do not assume the classical factorization, but instead solve for the evolution under the influence of the full "forward" Hamiltonian, we find the possibility of rapid evolution, under our definition, even when there is no seeding from conventional neutrino mixing. |
hep-ph/0509303 | Lin Li | Gang Hao, Lin Li, Cong-Feng Qiao | $D_s$ Asymmetry in Photoproduction | 4 pages, talk presented by I. Caprini at the International Conference
on QCD and Hadronic Physics, June 16-20 2005, Beijing | Int.J.Mod.Phys.A21:893-896,2006 | 10.1142/S0217751X06032253 | null | hep-ph | null | By adopting two models of strange and antistrange quark distributions inside
nucleon, the light-cone meson-baryon fluctuation model and the effective chiral
quark model, we calculate the $D_s^+ - D_s^-$ asymmetry in photoproduction in
the framework of heavy-quark recombination mechanism. We find that the effect
of asymmetry of strange sea to the $D_s$ asymmetry is considerable and
depending on the different models. Therefore, we expect that with the further
study in electroproduction, e.g. at HERA and CEBAF, the experimental
measurements on the $D_s^+ - D_s^-$ asymmetry may impose a strong restriction
on the strange-antistrange distribution asymmetry models.
| [
{
"created": "Tue, 27 Sep 2005 12:08:47 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Hao",
"Gang",
""
],
[
"Li",
"Lin",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | By adopting two models of strange and antistrange quark distributions inside nucleon, the light-cone meson-baryon fluctuation model and the effective chiral quark model, we calculate the $D_s^+ - D_s^-$ asymmetry in photoproduction in the framework of heavy-quark recombination mechanism. We find that the effect of asymmetry of strange sea to the $D_s$ asymmetry is considerable and depending on the different models. Therefore, we expect that with the further study in electroproduction, e.g. at HERA and CEBAF, the experimental measurements on the $D_s^+ - D_s^-$ asymmetry may impose a strong restriction on the strange-antistrange distribution asymmetry models. |
2407.02399 | John McDonald | John McDonald | Vector-like Quark Stabilised Higgs Inflation: Implications for Particle
Phenomenology, Primordial Gravitational Waves and the Hubble Tension | 15 pages, 10 figures. Additional references and discussion | null | null | null | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The Standard Model Higgs potential is very likely to be metastable, in which
case Higgs Inflation is likely to require an extension in order to stabilise
the potential. Here we consider stabilisation by adding $n_{Q} \leq 3$
Vector-Like Quarks (VLQs) of mass $m_{Q}$: $T$ vector quarks transforming as
$({\bf 3}, {\bf 1}, 2/3)$ and $B$ vector quarks transforming as $({\bf 3}, {\bf
1}, -1/3)$. Requiring stability of the finite-temperature effective potential,
and assuming $m_{t}$ equals its mean value, we find that the upper bounds on
$m_{Q}$ for $T$ quarks are 5.8 TeV (for $n_{Q} = 2$) and 55 TeV (for $n_{Q} =
3$). The corresponding absolute stability upper bounds are 4.4 TeV and 29 TeV.
Small upper bounds are obtained for $B$ quarks. For renormalisation in the
Einstein frame (Prescription I) the predictions are almost indistinguishable
from the classical values: $n_s = 0.966$ and $r = 3.3 \times 10^{-3}$.
Renormalisation in the Jordan frame (Prescription II) predicts larger values of
$n_{s}$ and $r$, with $n_{s}$ generally in the range 0.980 to 0.990 and $r$ of
the order of 0.01. The predicted range of $n_{s}$ is consistent with the CMB
range obtained in Hubble tension solutions which modify the sound horizon at
decoupling, whilst the predicted values of $r$ will be easily observable by
forthcoming CMB experiments. The observational upper bound on $r$ generally
imposes a stronger constraint on $m_{Q}$, with the $T$ quark upper bound equal
to 2.4 TeV for $n_{Q} = 2$ and 13 TeV for $n_{Q} = 3$. We conclude that
VLQ-stabilised Higgs Inflation with Prescription II renormalisation favours
1-10 TeV vector-like quarks that will be accessible to future colliders, and
predicts a tensor-to-scalar ratio that will be observable in forthcoming CMB
experiments and values of $n_{s}$ that favour an early-time solution to the
Hubble tension.
| [
{
"created": "Tue, 2 Jul 2024 16:16:57 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2024 17:15:47 GMT",
"version": "v2"
}
] | 2024-07-09 | [
[
"McDonald",
"John",
""
]
] | The Standard Model Higgs potential is very likely to be metastable, in which case Higgs Inflation is likely to require an extension in order to stabilise the potential. Here we consider stabilisation by adding $n_{Q} \leq 3$ Vector-Like Quarks (VLQs) of mass $m_{Q}$: $T$ vector quarks transforming as $({\bf 3}, {\bf 1}, 2/3)$ and $B$ vector quarks transforming as $({\bf 3}, {\bf 1}, -1/3)$. Requiring stability of the finite-temperature effective potential, and assuming $m_{t}$ equals its mean value, we find that the upper bounds on $m_{Q}$ for $T$ quarks are 5.8 TeV (for $n_{Q} = 2$) and 55 TeV (for $n_{Q} = 3$). The corresponding absolute stability upper bounds are 4.4 TeV and 29 TeV. Small upper bounds are obtained for $B$ quarks. For renormalisation in the Einstein frame (Prescription I) the predictions are almost indistinguishable from the classical values: $n_s = 0.966$ and $r = 3.3 \times 10^{-3}$. Renormalisation in the Jordan frame (Prescription II) predicts larger values of $n_{s}$ and $r$, with $n_{s}$ generally in the range 0.980 to 0.990 and $r$ of the order of 0.01. The predicted range of $n_{s}$ is consistent with the CMB range obtained in Hubble tension solutions which modify the sound horizon at decoupling, whilst the predicted values of $r$ will be easily observable by forthcoming CMB experiments. The observational upper bound on $r$ generally imposes a stronger constraint on $m_{Q}$, with the $T$ quark upper bound equal to 2.4 TeV for $n_{Q} = 2$ and 13 TeV for $n_{Q} = 3$. We conclude that VLQ-stabilised Higgs Inflation with Prescription II renormalisation favours 1-10 TeV vector-like quarks that will be accessible to future colliders, and predicts a tensor-to-scalar ratio that will be observable in forthcoming CMB experiments and values of $n_{s}$ that favour an early-time solution to the Hubble tension. |
hep-ph/0601244 | Steven D. Bass | R.J. Crewther, S.D. Bass, F.M. Steffens and A.W. Thomas | Decoupling heavy particles simultaneously | 6 pages, 4 figures. Talk presented at the "QCD Down Under" Workshop,
Barossa Valley and Adelaide, Australia, 10-19 March 2004, with ref 8 now
linked to hep-ph/0507278 | Nucl.Phys.Proc.Suppl.141:159-164,2005 | 10.1016/j.nuclphysbps.2004.12.024 | null | hep-ph | null | The renormalization group is extended to cases where several heavy particles
are decoupled at the same time. This involves large logarithms which are
scale-invariant and so cannot be eliminated by a change of renormalization
scheme. A set of scale-invariant running couplings, one for each heavy
particle, is constructed without reference to intermediate thresholds. The
entire heavy-quark correction to the axial charge of the weak neutral current
is derived to next-to-leading order, and checked in leading order by evaluating
diagrams explicitly. The mechanism for cancelling contributions from the top
and bottom quarks in the equal-mass limit is surprisingly non-trivial.
| [
{
"created": "Mon, 30 Jan 2006 09:20:18 GMT",
"version": "v1"
}
] | 2010-03-26 | [
[
"Crewther",
"R. J.",
""
],
[
"Bass",
"S. D.",
""
],
[
"Steffens",
"F. M.",
""
],
[
"Thomas",
"A. W.",
""
]
] | The renormalization group is extended to cases where several heavy particles are decoupled at the same time. This involves large logarithms which are scale-invariant and so cannot be eliminated by a change of renormalization scheme. A set of scale-invariant running couplings, one for each heavy particle, is constructed without reference to intermediate thresholds. The entire heavy-quark correction to the axial charge of the weak neutral current is derived to next-to-leading order, and checked in leading order by evaluating diagrams explicitly. The mechanism for cancelling contributions from the top and bottom quarks in the equal-mass limit is surprisingly non-trivial. |
1710.07164 | Li-Sheng Geng | Xiu-Lei Ren, Xi-Zhe Ling, and Li-Sheng Geng | Pion-nucleon sigma term revisited in covariant baryon chiral
perturbation theory | 7 pages, 2 figures, 2 tables | null | 10.1016/j.physletb.2018.05.063 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the latest $N_f=2+1+1$ and $N_f=2$ ETMC lattice QCD simulations of
the nucleon masses and extract the pion-nucleon sigma term utilizing the
Feynman-Hellmann theorem in SU(2) baryon chiral perturbation theory with the
extended-on-mass-shell scheme. We find that the lattice QCD data can be
described quite well already at the next-to-next-to-leading order. The overall
picture remains essentially the same at the next-to-next-to-next-to-leading
order. Our final result is $\sigma_{\pi N}=50.2(1.2)(2.0)$ MeV, or
equivalently, $f_{u/d}^N=0.0535(13)(21)$, where the first uncertainty is
statistical and second is theoretical originated from chiral truncations, which
is in agreement with that determined previously from the $N_f=2+1$ and $N_f=2$
lattice QCD data and that determined by the Cheng-Dashen theorem. In addition,
we show that the inclusion of the virtual $\Delta(1232)$ does not change
qualitatively our results.
| [
{
"created": "Thu, 19 Oct 2017 14:44:39 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2018 14:39:49 GMT",
"version": "v2"
}
] | 2018-07-13 | [
[
"Ren",
"Xiu-Lei",
""
],
[
"Ling",
"Xi-Zhe",
""
],
[
"Geng",
"Li-Sheng",
""
]
] | We study the latest $N_f=2+1+1$ and $N_f=2$ ETMC lattice QCD simulations of the nucleon masses and extract the pion-nucleon sigma term utilizing the Feynman-Hellmann theorem in SU(2) baryon chiral perturbation theory with the extended-on-mass-shell scheme. We find that the lattice QCD data can be described quite well already at the next-to-next-to-leading order. The overall picture remains essentially the same at the next-to-next-to-next-to-leading order. Our final result is $\sigma_{\pi N}=50.2(1.2)(2.0)$ MeV, or equivalently, $f_{u/d}^N=0.0535(13)(21)$, where the first uncertainty is statistical and second is theoretical originated from chiral truncations, which is in agreement with that determined previously from the $N_f=2+1$ and $N_f=2$ lattice QCD data and that determined by the Cheng-Dashen theorem. In addition, we show that the inclusion of the virtual $\Delta(1232)$ does not change qualitatively our results. |
2109.09752 | Melissa van Beekveld | Melissa van Beekveld, Leonardo Vernazza, Chris D. White | Threshold resummation of new partonic channels at next-to-leading power | null | null | 10.1007/JHEP12(2021)087 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Collider observables involving heavy particles are subject to large
logarithmic terms near threshold, which must be summed to all orders in
perturbation theory to obtain sensible results. Relatively recently, this
resummation has been extended to next-to-leading power in the threshold
variable, using a variety of approaches. In this paper, we consider partonic
channels that turn on only at next-to-leading power, and show that it is
possible to resum leading logarithms using well-established diagrammatic
techniques in Quantum Chromodynamics. We first consider deep inelastic
scattering, where we reproduce the results of a recent study using an effective
theory approach. Next, we consider the quark-gluon channel in both Drell-Yan
and Higgs boson production, showing that an explicit all-order form for the
leading logarithmic partonic cross section can be obtained. Our results agree
with previous conjectures based on fixed-order results.
| [
{
"created": "Mon, 20 Sep 2021 18:00:02 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"van Beekveld",
"Melissa",
""
],
[
"Vernazza",
"Leonardo",
""
],
[
"White",
"Chris D.",
""
]
] | Collider observables involving heavy particles are subject to large logarithmic terms near threshold, which must be summed to all orders in perturbation theory to obtain sensible results. Relatively recently, this resummation has been extended to next-to-leading power in the threshold variable, using a variety of approaches. In this paper, we consider partonic channels that turn on only at next-to-leading power, and show that it is possible to resum leading logarithms using well-established diagrammatic techniques in Quantum Chromodynamics. We first consider deep inelastic scattering, where we reproduce the results of a recent study using an effective theory approach. Next, we consider the quark-gluon channel in both Drell-Yan and Higgs boson production, showing that an explicit all-order form for the leading logarithmic partonic cross section can be obtained. Our results agree with previous conjectures based on fixed-order results. |
hep-ph/0103049 | Juergen Berges | G. Aarts and J. Berges (Heidelberg) | Nonequilibrium time evolution of the spectral function in quantum field
theory | 20 pages with 6 eps figures, explanation and references added; to
appear in Phys.Rev.D | Phys.Rev.D64:105010,2001 | 10.1103/PhysRevD.64.105010 | HD-THEP-01-11 | hep-ph hep-th nucl-th | null | Transport or kinetic equations are often derived assuming a quasi-particle
(on-shell) representation of the spectral function. We investigate this
assumption using a three-loop approximation of the 2PI effective action in real
time, without a gradient expansion or on-shell approximation. For a scalar
field in 1+1 dimensions the nonlinear evolution, including the integration over
memory kernels, can be solved numerically. We find that a spectral function
approximately described by a nonzero width emerges dynamically. During the
nonequilibrium time evolution the Wigner transformed spectral function is
slowly varying, even in presence of strong qualitative changes in the effective
particle distribution. These results may be used to make further analytical
progress towards a quantum Boltzmann equation including off-shell effects and a
nonzero width.
| [
{
"created": "Mon, 5 Mar 2001 14:22:36 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Aug 2001 13:32:30 GMT",
"version": "v2"
}
] | 2010-02-04 | [
[
"Aarts",
"G.",
"",
"Heidelberg"
],
[
"Berges",
"J.",
"",
"Heidelberg"
]
] | Transport or kinetic equations are often derived assuming a quasi-particle (on-shell) representation of the spectral function. We investigate this assumption using a three-loop approximation of the 2PI effective action in real time, without a gradient expansion or on-shell approximation. For a scalar field in 1+1 dimensions the nonlinear evolution, including the integration over memory kernels, can be solved numerically. We find that a spectral function approximately described by a nonzero width emerges dynamically. During the nonequilibrium time evolution the Wigner transformed spectral function is slowly varying, even in presence of strong qualitative changes in the effective particle distribution. These results may be used to make further analytical progress towards a quantum Boltzmann equation including off-shell effects and a nonzero width. |
hep-ph/0305295 | Osamu Yasuda | Osamu Yasuda | Parameter degeneracy and reactor experiments | 8 pages, 12 figures, uses ws-procs9x6.cls. To appear in the
proceedings of 4th Workshop on Neutrino Oscillations and their Origin
(NOON2003), Kanazawa, Japan, 10-14 Feb 2003 | null | null | null | hep-ph | null | Degeneracies of the neutrino oscillation parameters are explained using the
$\sin^22\theta_{13}$--$s^2_{23}$ plane. Measurements of $\sin^22\theta_{13}$ by
reactor experiments are free from the parameter degeneracies which occur in
accelerator appearance experiments, and reactor experiments play a role
complementary to accelerator experiments. It is shown that the reactor
measurement may be able to resolve the degeneracy in $\theta_{23}$ if
$\sin^22\theta_{13}$ and $\cos^22\theta_{23}$ are relatively large.
| [
{
"created": "Tue, 27 May 2003 08:35:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yasuda",
"Osamu",
""
]
] | Degeneracies of the neutrino oscillation parameters are explained using the $\sin^22\theta_{13}$--$s^2_{23}$ plane. Measurements of $\sin^22\theta_{13}$ by reactor experiments are free from the parameter degeneracies which occur in accelerator appearance experiments, and reactor experiments play a role complementary to accelerator experiments. It is shown that the reactor measurement may be able to resolve the degeneracy in $\theta_{23}$ if $\sin^22\theta_{13}$ and $\cos^22\theta_{23}$ are relatively large. |
hep-ph/0506191 | Claudio Nassif | Claudio Nassif and P.R. Silva | Quantum Electro and Chromodynamics treated by Thompson's heuristic
approach | RevTex, 25 pages, no figures | Int.J.Mod.Phys. A21 (2006) 3809-3824 | 10.1142/S0217751X06031508 | null | hep-ph | null | In this work we apply Thompson's method (of the dimensions and scales) to
study some features of the Quantum Electro and Chromodynamics. This heuristic
method can be considered as a simple and alternative way to the Renormalisation
Group (R.G.) approach and when applied to QED-lagrangian is able to obtain in a
first approximation both the running coupling constant behavior of alpha(mu)
and the mass m(mu).The calculations are evaluated just at d_c=4, where d_c is
the upper critical dimension of the problem, so that we obtain the logarithmic
behavior both for the coupling alpha and the excess of mass Delta m on the
energy scale mu. Although our results are well-known in the vast literature of
field theories,it seems that one of the advantages of Thompson's method, beyond
its simplicity is that it is able to extract directly from QED-lagrangian the
physical (finite) behavior of alpha(mu) and m(mu), bypassing hard problems of
divergences which normally appear in the conventional renormalisation schemes
applied to field theories like QED. Quantum Chromodynamics (QCD) is also
treated by the present method in order to obtain the quark condensate value.
Besides this, the method is also able to evaluate the vacuum pressure at the
boundary of the nucleon. This is done by assumming a step function behavior for
the running coupling constant of the QCD, which fits nicely to some quantities
related to the strong interaction evaluated through the MIT-bag model.
| [
{
"created": "Mon, 20 Jun 2005 01:46:14 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Nassif",
"Claudio",
""
],
[
"Silva",
"P. R.",
""
]
] | In this work we apply Thompson's method (of the dimensions and scales) to study some features of the Quantum Electro and Chromodynamics. This heuristic method can be considered as a simple and alternative way to the Renormalisation Group (R.G.) approach and when applied to QED-lagrangian is able to obtain in a first approximation both the running coupling constant behavior of alpha(mu) and the mass m(mu).The calculations are evaluated just at d_c=4, where d_c is the upper critical dimension of the problem, so that we obtain the logarithmic behavior both for the coupling alpha and the excess of mass Delta m on the energy scale mu. Although our results are well-known in the vast literature of field theories,it seems that one of the advantages of Thompson's method, beyond its simplicity is that it is able to extract directly from QED-lagrangian the physical (finite) behavior of alpha(mu) and m(mu), bypassing hard problems of divergences which normally appear in the conventional renormalisation schemes applied to field theories like QED. Quantum Chromodynamics (QCD) is also treated by the present method in order to obtain the quark condensate value. Besides this, the method is also able to evaluate the vacuum pressure at the boundary of the nucleon. This is done by assumming a step function behavior for the running coupling constant of the QCD, which fits nicely to some quantities related to the strong interaction evaluated through the MIT-bag model. |
hep-ph/9905485 | Alexei A. Pivovarov | A.A.Pivovarov | Two-loop corrections to the correlator of tensor currents in
gluodynamics | 10 pages, latex, no figures | Phys.Atom.Nucl.63:1646-1649,2000; Yad.Fiz.63N9:1734-1737,2000 | 10.1134/1.1312900 | MZ-TH/99-21 | hep-ph hep-ex | null | Results of evaluating the leading order $\alpha_s$ corrections to the
correlator of tensor currents in pure gluodynamics are presented. These
corrections to the parton result for the correlator are not large numerically
that allows one to use perturbation theory for the analysis of the resonance
spectrum within the sum rules method.
| [
{
"created": "Wed, 26 May 1999 07:01:20 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Pivovarov",
"A. A.",
""
]
] | Results of evaluating the leading order $\alpha_s$ corrections to the correlator of tensor currents in pure gluodynamics are presented. These corrections to the parton result for the correlator are not large numerically that allows one to use perturbation theory for the analysis of the resonance spectrum within the sum rules method. |
1911.03481 | Giovanni Grilli di Cortona | Marcin Badziak, Giovanni Grilli di Cortona and Keisuke Harigaya | Natural Twin Neutralino Dark Matter | 6 pages, 3 figures + supplemental material | Phys. Rev. Lett. 124, 121803 (2020) | 10.1103/PhysRevLett.124.121803 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric Twin Higgs models have a discrete symmetry for which each
Standard Model particle and its supersymmetric partner have a corresponding
state that transforms under a mirror Standard Model gauge group. This framework
is able to accommodate the non-discovery of new particles at the LHC with the
naturalness of the electroweak scale. We point out that supersymmetric Twin
Higgs models also provide a natural dark matter candidate. We investigate the
possibility that a twin bino-like state is the Lightest Supersymmetric Particle
and find that its freeze-out abundance can explain the observed dark matter
abundance without fine-tuning the mass spectrum of the theory. Most of the
viable parameter space can be probed by future dark matter direct detection
experiments and the LHC searches for staus and higgsinos which may involve
displaced vertices.
| [
{
"created": "Fri, 8 Nov 2019 19:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2020 19:39:21 GMT",
"version": "v2"
}
] | 2020-04-24 | [
[
"Badziak",
"Marcin",
""
],
[
"di Cortona",
"Giovanni Grilli",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | Supersymmetric Twin Higgs models have a discrete symmetry for which each Standard Model particle and its supersymmetric partner have a corresponding state that transforms under a mirror Standard Model gauge group. This framework is able to accommodate the non-discovery of new particles at the LHC with the naturalness of the electroweak scale. We point out that supersymmetric Twin Higgs models also provide a natural dark matter candidate. We investigate the possibility that a twin bino-like state is the Lightest Supersymmetric Particle and find that its freeze-out abundance can explain the observed dark matter abundance without fine-tuning the mass spectrum of the theory. Most of the viable parameter space can be probed by future dark matter direct detection experiments and the LHC searches for staus and higgsinos which may involve displaced vertices. |
2306.16477 | Leonardo Badurina | Leonardo Badurina, Ankit Beniwal, Christopher McCabe | Super-Nyquist ultralight dark matter searches with broadband atom
gradiometers | 28 pages plus appendices, 12 figures. v2: matches published version | Phys. Rev. D 108, 083016 (2023) | 10.1103/PhysRevD.108.083016 | KCL-PH-TH/2023-30, AION-REPORT/2023-05 | hep-ph astro-ph.CO physics.atom-ph | http://creativecommons.org/licenses/by/4.0/ | Atom gradiometers have emerged as compelling broadband probes of scalar
ultralight dark matter (ULDM) candidates that oscillate with frequencies
between approximately $10^{-2}$ Hz and $10^3$ Hz. ULDM signals with frequencies
greater than $\sim 1$ Hz exceed the expected Nyquist frequency of atom
gradiometers, and so are affected by aliasing and related phenomena, including
signal folding and spectral distortion. To facilitate the discovery of
super-Nyquist ULDM signals, in this work we investigate the impact of these
effects on parameter reconstruction using a robust likelihood-based framework.
We demonstrate that accurate reconstruction of ULDM parameters can be achieved
as long as the experimental frequency resolution is larger than the ULDM signal
linewidth. Notably, as ULDM candidates whose frequencies differ by integer
multiples of the sampling frequency are identified at the same aliased
frequency, our discovery analysis recovers discrete islands in parameter space.
Our study represents the first comprehensive exploration of aliasing in the
context of dark matter direct detection and paves the way for enhanced ULDM
detection strategies with atom gradiometers.
| [
{
"created": "Wed, 28 Jun 2023 18:06:29 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2023 00:37:58 GMT",
"version": "v2"
}
] | 2023-10-16 | [
[
"Badurina",
"Leonardo",
""
],
[
"Beniwal",
"Ankit",
""
],
[
"McCabe",
"Christopher",
""
]
] | Atom gradiometers have emerged as compelling broadband probes of scalar ultralight dark matter (ULDM) candidates that oscillate with frequencies between approximately $10^{-2}$ Hz and $10^3$ Hz. ULDM signals with frequencies greater than $\sim 1$ Hz exceed the expected Nyquist frequency of atom gradiometers, and so are affected by aliasing and related phenomena, including signal folding and spectral distortion. To facilitate the discovery of super-Nyquist ULDM signals, in this work we investigate the impact of these effects on parameter reconstruction using a robust likelihood-based framework. We demonstrate that accurate reconstruction of ULDM parameters can be achieved as long as the experimental frequency resolution is larger than the ULDM signal linewidth. Notably, as ULDM candidates whose frequencies differ by integer multiples of the sampling frequency are identified at the same aliased frequency, our discovery analysis recovers discrete islands in parameter space. Our study represents the first comprehensive exploration of aliasing in the context of dark matter direct detection and paves the way for enhanced ULDM detection strategies with atom gradiometers. |
hep-ph/9807264 | Chris Quigg | Raj Gandhi, Chris Quigg, Mary Hall Reno, Ina Sarcevic | Neutrino Interactions at Ultrahigh Energies | 32 pages, 11 figures, uses RevTeX and boxedeps | Phys.Rev.D58:093009,1998 | 10.1103/PhysRevD.58.093009 | FERMILAB-PUB-98/087-T | hep-ph astro-ph | null | We report new calculations of the cross sections for deeply inelastic
neutrino-nucleon scattering at neutrino energies between $10^{9}\ev$ and
$10^{21}\ev$. We compare with results in the literature and assess the
reliability of our predictions. For completeness, we briefly review the cross
sections for neutrino interactions with atomic electrons, emphasizing the role
of the $W$-boson resonance in $\bar{\nu}_{e}e$ interactions for neutrino
energies in the neighborhood of $6.3\pev$. Adopting model predictions for
extraterrestrial neutrino fluxes from active galactic nuclei, gamma-ray
bursters, and the collapse of topological defects, we estimate event rates in
large-volume water \v{C}erenkov detectors and large-area ground arrays.
| [
{
"created": "Mon, 6 Jul 1998 22:03:52 GMT",
"version": "v1"
}
] | 2009-05-05 | [
[
"Gandhi",
"Raj",
""
],
[
"Quigg",
"Chris",
""
],
[
"Reno",
"Mary Hall",
""
],
[
"Sarcevic",
"Ina",
""
]
] | We report new calculations of the cross sections for deeply inelastic neutrino-nucleon scattering at neutrino energies between $10^{9}\ev$ and $10^{21}\ev$. We compare with results in the literature and assess the reliability of our predictions. For completeness, we briefly review the cross sections for neutrino interactions with atomic electrons, emphasizing the role of the $W$-boson resonance in $\bar{\nu}_{e}e$ interactions for neutrino energies in the neighborhood of $6.3\pev$. Adopting model predictions for extraterrestrial neutrino fluxes from active galactic nuclei, gamma-ray bursters, and the collapse of topological defects, we estimate event rates in large-volume water \v{C}erenkov detectors and large-area ground arrays. |
hep-ph/0104160 | Yukinori Nagatani | Yukinori Nagatani (Yukawa Inst., Kyoto Univ.) | Electroweak Domain Wall by Hawking Radiation: Baryogenesis and Dark
Matter from Several Hundred kg Black Holes | 28 pages, 7 figures, LaTeX2e with graphicx macro | null | null | YITP-01-28 | hep-ph astro-ph | null | We show that a spherical electroweak domain wall is formed around a small
black hole and this is a general property of the Hawking radiation in the
vacuum of the Standard Model. The wall appears not only for the first order
phase transition in the electroweak theory but also for the second order one
because the black hole heats up its neighborhood locally by the Hawking
radiation in any case. We propose a model for unifying the origin of the baryon
number and the cold dark matter in our universe by using properties of the
primordial black hole with a mass of several hundred kilograms. The interaction
between our wall and the Hawking-radiated-particles can create a baryon number
which is proportional to the mass of the black hole as well as the CP broken
phase in the extension of the Standard Model. Our model can explain both the
baryon-entropy ratio B/S \sim 10^{-10} and the energy density of the dark
matter, provided that the following three conditions are satisfied: (i) the
primordial black holes dominate in the early universe, (ii) the CP broken phase
in the wall is in the order of one and (iii) any black hole leaves a stable
remnant with a Planck mass after its evaporation. Our model also predicts a
cosmological graviton background with a peak-energy 120 \sim 280 eV in the
present universe.
| [
{
"created": "Tue, 17 Apr 2001 14:30:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nagatani",
"Yukinori",
"",
"Yukawa Inst., Kyoto Univ."
]
] | We show that a spherical electroweak domain wall is formed around a small black hole and this is a general property of the Hawking radiation in the vacuum of the Standard Model. The wall appears not only for the first order phase transition in the electroweak theory but also for the second order one because the black hole heats up its neighborhood locally by the Hawking radiation in any case. We propose a model for unifying the origin of the baryon number and the cold dark matter in our universe by using properties of the primordial black hole with a mass of several hundred kilograms. The interaction between our wall and the Hawking-radiated-particles can create a baryon number which is proportional to the mass of the black hole as well as the CP broken phase in the extension of the Standard Model. Our model can explain both the baryon-entropy ratio B/S \sim 10^{-10} and the energy density of the dark matter, provided that the following three conditions are satisfied: (i) the primordial black holes dominate in the early universe, (ii) the CP broken phase in the wall is in the order of one and (iii) any black hole leaves a stable remnant with a Planck mass after its evaporation. Our model also predicts a cosmological graviton background with a peak-energy 120 \sim 280 eV in the present universe. |
hep-ph/0209328 | Grzegorz Wilk | F.O.Duraes, F.S.Navarra and G.Wilk | Leading particles and diffractive spectra in the Interacting Gluon Model | Presented at Diffraction2002, Alushta, Crimea (Ukraina), August 31 -
September 5, 2002. To be published by Kluwer Academic Publishers (2003)
(necessary style files attached). Rewritten according to the Kluwer
specifications | null | null | null | hep-ph nucl-th | null | We discuss the leading particle spectra and diffractive mass spectra from the
novel point of view, namely by treating them as particular examples of the
general energy flow phenomena taking place in the multiparticle production
processes. We argue that they show a high degree of universality what allows
for their simple description in terms of the Interacting Gluon Model developed
by us some time ago.
| [
{
"created": "Fri, 27 Sep 2002 07:30:31 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2002 11:18:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Duraes",
"F. O.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Wilk",
"G.",
""
]
] | We discuss the leading particle spectra and diffractive mass spectra from the novel point of view, namely by treating them as particular examples of the general energy flow phenomena taking place in the multiparticle production processes. We argue that they show a high degree of universality what allows for their simple description in terms of the Interacting Gluon Model developed by us some time ago. |
1201.2699 | Kfir Blum | Kfir Blum, Aielet Efrati, Yuval Grossman, Yosef Nir, Antonio Riotto | Asymmetric Higgsino Dark Matter | 5 pages, 2 figures | null | 10.1103/PhysRevLett.109.051302 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the supersymmetric framework, a higgsino asymmetry exists in the universe
before the electroweak phase transition. We investigate whether the higgsino is
a viable asymmetric dark matter candidate. We find that this is indeed
possible. The gauginos, squarks and sleptons must all be very heavy, such that
the only electroweak-scale superpartners are the higgsinos. The temperature of
the electroweak phase transition must be in the (1-10) GeV range.
| [
{
"created": "Thu, 12 Jan 2012 22:39:00 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Blum",
"Kfir",
""
],
[
"Efrati",
"Aielet",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Nir",
"Yosef",
""
],
[
"Riotto",
"Antonio",
""
]
] | In the supersymmetric framework, a higgsino asymmetry exists in the universe before the electroweak phase transition. We investigate whether the higgsino is a viable asymmetric dark matter candidate. We find that this is indeed possible. The gauginos, squarks and sleptons must all be very heavy, such that the only electroweak-scale superpartners are the higgsinos. The temperature of the electroweak phase transition must be in the (1-10) GeV range. |
hep-ph/0309295 | Werner Vogelsang | Werner Vogelsang | Some News on Spin Physics | 14 pages, LaTeX, 9 figures as eps files. Invited plenary talk
presented at the "XIth International Workshop on Deep Inelastic Scattering
(DIS 2003)", St. Petersburg, Russia, April 23-27, 2003 | null | null | BNL-NT-03/28, RBRC-338 | hep-ph | null | We briefly review some of the recent developments in QCD spin physics.
| [
{
"created": "Thu, 25 Sep 2003 18:03:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vogelsang",
"Werner",
""
]
] | We briefly review some of the recent developments in QCD spin physics. |
1212.4814 | Peter Watson | Peter Watson, Hugo Reinhardt (Tuebingen U.) | Gap and Bethe-Salpeter equations in Coulomb gauge | 8 pages, 5 figures, talk presented at "Quark Confinement and the
Hadron Spectrum X", Munich, October 8-12, 2012 | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | I will discuss the gap and Bethe-Salpeter equations for quantum
chromodynamics in Coulomb gauge under a leading order truncation scheme. Within
this scheme, the role of charge conservation and the cancellation of infrared
divergences becomes particularly clear. The quark gap equation exhibits not
only chiral symmetry breaking, but explicitly reproduces the heavy quark limit.
The corresponding gluon equation has a massive solution with interesting
nonperturbative renormalization properties. I will further discuss various
aspects of the Bethe-Salpeter equation for pseudoscalar and vector mesons with
arbitrary quark masses and present numerical results for the meson masses and
leptonic decay constants.
| [
{
"created": "Wed, 19 Dec 2012 20:18:40 GMT",
"version": "v1"
}
] | 2012-12-20 | [
[
"Watson",
"Peter",
"",
"Tuebingen U."
],
[
"Reinhardt",
"Hugo",
"",
"Tuebingen U."
]
] | I will discuss the gap and Bethe-Salpeter equations for quantum chromodynamics in Coulomb gauge under a leading order truncation scheme. Within this scheme, the role of charge conservation and the cancellation of infrared divergences becomes particularly clear. The quark gap equation exhibits not only chiral symmetry breaking, but explicitly reproduces the heavy quark limit. The corresponding gluon equation has a massive solution with interesting nonperturbative renormalization properties. I will further discuss various aspects of the Bethe-Salpeter equation for pseudoscalar and vector mesons with arbitrary quark masses and present numerical results for the meson masses and leptonic decay constants. |
hep-ph/9302304 | Lluis Ametller | Ll. Ametller, A. Bramon and E. Mass\'o | The $\pi^0\to e^+e^-$ and $\eta\to \mu^+ \mu^-$ Decays Revisited | 10 pages, LATEX (revised version for recent experimental data) | Phys.Rev. D48 (1993) 3388-3391 | 10.1103/PhysRevD.48.3388 | UAB-FT-300/93 | hep-ph | null | The rare $\pi^0 \to e^+e^-$ and $\eta \to \mu^+\mu^-$ decays are calculated
in different schemes, which are seen to be essentially equivalent to and
produce the same results as conventional Vector-Meson Dominance. We obtain the
theoretical predictions $B(\pi^0 \to e^+e^-) = (6.41 \pm 0.19)\times 10^{-8}$
and $B(\eta \to \mu^+\mu^-) = (1.14 +0.06 -0.03) \times 10^{-5}$ in agreement
with recent experimental data.
| [
{
"created": "Wed, 24 Feb 1993 17:10:17 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 1993 09:58:39 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Ametller",
"Ll.",
""
],
[
"Bramon",
"A.",
""
],
[
"Massó",
"E.",
""
]
] | The rare $\pi^0 \to e^+e^-$ and $\eta \to \mu^+\mu^-$ decays are calculated in different schemes, which are seen to be essentially equivalent to and produce the same results as conventional Vector-Meson Dominance. We obtain the theoretical predictions $B(\pi^0 \to e^+e^-) = (6.41 \pm 0.19)\times 10^{-8}$ and $B(\eta \to \mu^+\mu^-) = (1.14 +0.06 -0.03) \times 10^{-5}$ in agreement with recent experimental data. |
1910.09545 | Coskun Aydin | C. Ayd{\i}n | Anapole Moment of Leptons in the Minimal Supersymmetric Standard Model | 2 Figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using Feynman-'t Hooft gauge and dimensional regularization, the static
parity-violating coupling of the neutrinos and charged leptons to an external
electromagnetic field is calculated in the minimal supersymmetry standard model
(MSSM). From the obtained result of calculations, we have seen that the main
contribution come from chargino particles in MSSM.
| [
{
"created": "Mon, 21 Oct 2019 07:08:13 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2020 08:05:46 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jan 2020 09:25:10 GMT",
"version": "v3"
},
{
"created": "Fri, 29 May 2020 20:45:01 GMT",
"version": "v4"
}
] | 2020-06-02 | [
[
"Aydın",
"C.",
""
]
] | Using Feynman-'t Hooft gauge and dimensional regularization, the static parity-violating coupling of the neutrinos and charged leptons to an external electromagnetic field is calculated in the minimal supersymmetry standard model (MSSM). From the obtained result of calculations, we have seen that the main contribution come from chargino particles in MSSM. |
1303.0779 | Ibragim Alikhanov | I. Alikhanov | CP violation in neutrino-photon scattering | 10 pages, 3 figures. Version accepted for publication in J. Phys. G | J. Phys. G: 41 (2014) 025005 | 10.1088/0954-3899/41/2/025005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that effects of CP violation arise in neutrino-photon scattering.
Several CP-violating $\nu\gamma$ reactions are considered within the Standard
Model and predictions for some observables are made. It is emphasized that
neutrino-photon scattering may provide an experimental tool for testing the
scale dependence of CP violation.
| [
{
"created": "Mon, 4 Mar 2013 18:51:27 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2013 19:24:56 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Nov 2013 06:02:47 GMT",
"version": "v3"
}
] | 2014-01-21 | [
[
"Alikhanov",
"I.",
""
]
] | It is shown that effects of CP violation arise in neutrino-photon scattering. Several CP-violating $\nu\gamma$ reactions are considered within the Standard Model and predictions for some observables are made. It is emphasized that neutrino-photon scattering may provide an experimental tool for testing the scale dependence of CP violation. |
2402.10471 | Ning Chen | Ning Chen, Ying-nan Mao, Zhaolong Teng | The Standard Model quark/lepton masses and the Cabibbo-Kobayashi-Maskawa
mixing in an ${\rm SU}(8)$ theory | 37 pages with references, one appendix, 8 tables. Sequel to:
arXiv:2307.07921 | null | null | null | hep-ph hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | The origins of Standard Model (SM) quark/lepton masses and the
Cabibbo-Kobayashi-Maskawa (CKM) mixing pattern are described in an ${\rm
SU}(8)$ theory, where three-generational SM fermions transform differently. A
realistic symmetry breaking pattern with three intermediate scales is
described, along which all vectorlike electrically charged fermions become
massive. A set of $d=5$ operators that explicitly break the emergent global
symmetries are analyzed to generate the observed three-generational SM
quark/lepton mass hierarchies as well as the CKM mixing pattern. All SM flavors
are identified in the spectrum.
| [
{
"created": "Fri, 16 Feb 2024 06:31:08 GMT",
"version": "v1"
}
] | 2024-06-17 | [
[
"Chen",
"Ning",
""
],
[
"Mao",
"Ying-nan",
""
],
[
"Teng",
"Zhaolong",
""
]
] | The origins of Standard Model (SM) quark/lepton masses and the Cabibbo-Kobayashi-Maskawa (CKM) mixing pattern are described in an ${\rm SU}(8)$ theory, where three-generational SM fermions transform differently. A realistic symmetry breaking pattern with three intermediate scales is described, along which all vectorlike electrically charged fermions become massive. A set of $d=5$ operators that explicitly break the emergent global symmetries are analyzed to generate the observed three-generational SM quark/lepton mass hierarchies as well as the CKM mixing pattern. All SM flavors are identified in the spectrum. |
0904.1748 | Peter Petreczky | Alexei Bazavov, Peter Petreczky, Alexander Velytsky | Quarkonium at Finite Temperature | 50 pages, 30 figures, 2 tables; invited review for chapter in
"Quark-Gluon Plasma 4 | null | 10.1142/9789814293297_0002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss properties of heavy quarkonium states at high temperatures based
on lattice QCD and potential models. We review recent progress made in lattice
calculations of spatial static quark anti-quark correlators as well as
quarkonium correlators in Euclidean time. Recent developments in effective
field theory approach and potential models are also discussed.
| [
{
"created": "Mon, 13 Apr 2009 17:16:43 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Bazavov",
"Alexei",
""
],
[
"Petreczky",
"Peter",
""
],
[
"Velytsky",
"Alexander",
""
]
] | We discuss properties of heavy quarkonium states at high temperatures based on lattice QCD and potential models. We review recent progress made in lattice calculations of spatial static quark anti-quark correlators as well as quarkonium correlators in Euclidean time. Recent developments in effective field theory approach and potential models are also discussed. |
hep-ph/9905451 | Polityko S. I. | S.I.Polityko (Irkutsk State University) | The production of light Goldstone particles on photon colliders | LaTex2e, 9 pages, 1 Postscript figure, PSfile | null | null | ISU-IAP.TH 99-02,Irkutsk | hep-ph | null | It is shown that by realizing the project of intensive $\gamma $ beams with
large energy (project PLC) an essential flux of light Goldstone particles
(axions, arions, familons, majorons) will be generated. The light higgs can be
observed via interaction with matter. The probability of light higgs - electron
production by absorption of several laser photons simultaneously is calculated.
| [
{
"created": "Sat, 22 May 1999 15:16:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Polityko",
"S. I.",
"",
"Irkutsk State University"
]
] | It is shown that by realizing the project of intensive $\gamma $ beams with large energy (project PLC) an essential flux of light Goldstone particles (axions, arions, familons, majorons) will be generated. The light higgs can be observed via interaction with matter. The probability of light higgs - electron production by absorption of several laser photons simultaneously is calculated. |
1704.00179 | Rui-Lin Zhu | Wei Wang, Rui-Lin Zhu | Interpretation of the newly observed $\Omega_c^0$ resonances | 6 pages and 2 tables; To be published in Phys.Rev.D | Phys. Rev. D 96, 014024 (2017) | 10.1103/PhysRevD.96.014024 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the charmed and bottomed doubly strange baryons within the
heavy-quark-light-diquark framework. The two strange quarks are assumed to lie
in $S$ wave and thus their total spin is 1. We calculate the mass spectra of
the $S$ and $P$ wave orbitally excited states and find the $\Omega_c^0 (2695)$
and $\Omega_c^0 (2770)$ fit well as the $S$ wave states of charmed doubly
strange baryons. The five newly $\Omega_c^0(X)$ resonances observed by the LHCb
Collaboration, i.e. $\Omega_c^0(3000)$, $\Omega_c^0(3050)$, $\Omega_c^0(3066)$,
$\Omega_c^0(3090)$, and $\Omega_c^0(3119)$, can be interpreted as the $P$ wave
orbitally excited states. In heavy quark effective theory, we analyze their
decays into the $\Xi^+_c K^-$ and $\Xi_c'^+ K^-$, and point out that decays of
the five P-wave $\Omega_c^0$ states into the $\Xi_c^+ K^-$ and $\Xi_c'^+K^-$
are suppressed by either heavy quark symmetry or phase space. The narrowness of
the five newly observed $\Omega_c^0(X)$ states can then be naturally
interpreted with heavy quark symmetry.
| [
{
"created": "Sat, 1 Apr 2017 15:12:20 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jul 2017 06:17:58 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Wang",
"Wei",
""
],
[
"Zhu",
"Rui-Lin",
""
]
] | We study the charmed and bottomed doubly strange baryons within the heavy-quark-light-diquark framework. The two strange quarks are assumed to lie in $S$ wave and thus their total spin is 1. We calculate the mass spectra of the $S$ and $P$ wave orbitally excited states and find the $\Omega_c^0 (2695)$ and $\Omega_c^0 (2770)$ fit well as the $S$ wave states of charmed doubly strange baryons. The five newly $\Omega_c^0(X)$ resonances observed by the LHCb Collaboration, i.e. $\Omega_c^0(3000)$, $\Omega_c^0(3050)$, $\Omega_c^0(3066)$, $\Omega_c^0(3090)$, and $\Omega_c^0(3119)$, can be interpreted as the $P$ wave orbitally excited states. In heavy quark effective theory, we analyze their decays into the $\Xi^+_c K^-$ and $\Xi_c'^+ K^-$, and point out that decays of the five P-wave $\Omega_c^0$ states into the $\Xi_c^+ K^-$ and $\Xi_c'^+K^-$ are suppressed by either heavy quark symmetry or phase space. The narrowness of the five newly observed $\Omega_c^0(X)$ states can then be naturally interpreted with heavy quark symmetry. |
0912.4150 | Rui Santos | Alexander Belyaev, Renato Guedes, Stefano Moretti and Rui Santos | Very Light Higgs Bosons in Extended Models at the LHC | 14 pages, 11 figures | Phys.Rev.D81:095006,2010 | 10.1103/PhysRevD.81.095006 | SHEP-09-12 and DFTT-60-2009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Large Electron-Positron (LEP) collider experiments have constrained the
mass of the Standard Model (SM) Higgs boson to be above 114.4 GeV. This bound
applies to all extensions of the SM where the coupling of a Higgs boson to the
Z boson and also the Higgs decay profile do not differ much from the SM one.
However, in scenarios with extended Higgs sectors, this coupling can be made
very small by a suitable choice of the parameters of the model. In such cases,
the lightest CP-even Higgs boson mass can in turn be made very small. Such a
very light Higgs state, with a mass of the order of the Z boson one or even
smaller, could have escaped detection at LEP. In this work we perform a
detailed parton level study on the feasibility of the detection of such a very
light Higgs particle at the Large Hadron Collider (LHC) in the production
process pp \to h j \to \tau^+ \tau^- j, where j is a resolved jet. We conclude
that there are several models where such a Higgs state could be detected at the
LHC with early data.
| [
{
"created": "Mon, 21 Dec 2009 16:41:20 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2010 23:19:38 GMT",
"version": "v2"
}
] | 2010-05-25 | [
[
"Belyaev",
"Alexander",
""
],
[
"Guedes",
"Renato",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Santos",
"Rui",
""
]
] | The Large Electron-Positron (LEP) collider experiments have constrained the mass of the Standard Model (SM) Higgs boson to be above 114.4 GeV. This bound applies to all extensions of the SM where the coupling of a Higgs boson to the Z boson and also the Higgs decay profile do not differ much from the SM one. However, in scenarios with extended Higgs sectors, this coupling can be made very small by a suitable choice of the parameters of the model. In such cases, the lightest CP-even Higgs boson mass can in turn be made very small. Such a very light Higgs state, with a mass of the order of the Z boson one or even smaller, could have escaped detection at LEP. In this work we perform a detailed parton level study on the feasibility of the detection of such a very light Higgs particle at the Large Hadron Collider (LHC) in the production process pp \to h j \to \tau^+ \tau^- j, where j is a resolved jet. We conclude that there are several models where such a Higgs state could be detected at the LHC with early data. |
2110.15612 | Shu-Sheng Xu | Shu-Sheng Xu | Pion superfluid phase transition at finite isospin chemical potential | Online published in Eur. Phys. J. A (2021) 57:298 | null | 10.1140/epja/s10050-021-00611-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pion superfluidity phase transition at $T-\mu_I$ and $\mu_q-\mu_I$ planes
are studied in the framework of Dyson-Schwinger equations. The rainbow
truncation and Gaussian effective gluon propagator are employed to calculate
pion condensate, $\langle\pi\rangle$, as a function of $\mu_I$ at finite $T$
and $\mu_q$. At $T=(0, 80, 113, 120)$~MeV, the $\langle\pi\rangle$ keeps zero
when $\mu_I$ is less than a critical value $\mu_{Ic}(T)$. The
$\langle\pi\rangle$ at $T=113$~MeV agrees with the lattice QCD result. At the
$T-\mu_I$ plane, the pion superfluid phase appears at low temperature and high
isospin chemical potential region. At finite $\mu_q$, $\langle\pi\rangle$
varying with $\mu_I$ almost coincide for $\mu_q<400$~MeV. At $\mu_q-\mu_I$
plane, the pion superfluid phase appears at $\mu_I\gtrsim m_\pi$ when
$\mu_q<400$~MeV.
| [
{
"created": "Fri, 29 Oct 2021 08:26:51 GMT",
"version": "v1"
}
] | 2021-11-01 | [
[
"Xu",
"Shu-Sheng",
""
]
] | The pion superfluidity phase transition at $T-\mu_I$ and $\mu_q-\mu_I$ planes are studied in the framework of Dyson-Schwinger equations. The rainbow truncation and Gaussian effective gluon propagator are employed to calculate pion condensate, $\langle\pi\rangle$, as a function of $\mu_I$ at finite $T$ and $\mu_q$. At $T=(0, 80, 113, 120)$~MeV, the $\langle\pi\rangle$ keeps zero when $\mu_I$ is less than a critical value $\mu_{Ic}(T)$. The $\langle\pi\rangle$ at $T=113$~MeV agrees with the lattice QCD result. At the $T-\mu_I$ plane, the pion superfluid phase appears at low temperature and high isospin chemical potential region. At finite $\mu_q$, $\langle\pi\rangle$ varying with $\mu_I$ almost coincide for $\mu_q<400$~MeV. At $\mu_q-\mu_I$ plane, the pion superfluid phase appears at $\mu_I\gtrsim m_\pi$ when $\mu_q<400$~MeV. |
0711.1121 | Sven-Olaf Moch | S. Moch and A. Mitov | Massive QCD amplitudes at higher orders | 8 pages, presented at the conferences `Matter to the Deepest', Ustron
(Poland), September '07, and Radcor 2007, Florence (Italy), October '07 | Acta Phys.Polon.B38:3507-3516,2007; PoS RADCOR2007:027,2007 | null | DESY 07-193, SFB/CPP-07-77 | hep-ph | null | We consider the factorization properties of on-shell QCD amplitudes with
massive partons in the limit when all kinematical invariants are large compared
to the parton mass and discuss the structure of their infrared singularities.
The dimensionally regulated soft poles and the large collinear logarithms of
the parton masses exponentiate to all orders. Based on this factorization a
simple relation between massless and massive scattering amplitudes in gauge
theories can be established. We present recent applications of this relation
for the calculation of the two-loop virtual QCD corrections to the
hadro-production of heavy quarks.
| [
{
"created": "Wed, 7 Nov 2007 17:09:52 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Moch",
"S.",
""
],
[
"Mitov",
"A.",
""
]
] | We consider the factorization properties of on-shell QCD amplitudes with massive partons in the limit when all kinematical invariants are large compared to the parton mass and discuss the structure of their infrared singularities. The dimensionally regulated soft poles and the large collinear logarithms of the parton masses exponentiate to all orders. Based on this factorization a simple relation between massless and massive scattering amplitudes in gauge theories can be established. We present recent applications of this relation for the calculation of the two-loop virtual QCD corrections to the hadro-production of heavy quarks. |
2201.10338 | Joao Pacheco B. C. de Melo Dr. | W. R. B. de Ara\'ujo (Secretaria de Educa\c{c}\~ao do Estado de S\~ao
Paulo, Brazil), E. F.Suisso (Instituto Nacional de Propriedade Industrial,
INPI, RJ), J. P. B. C. de Melo (Laborat\'orio de F\'isica Te\'orica e
Computacional - LFTC, Universidade Cruzeiro do Sul / Universidade Cidade de
S\~ao Paulo, S\~ao Paulo, Brazil), T. Frederico (Instituto Tecnol\'ogico de
Aeron\'autica, DCTA, S\~ao Jo\'e dos Campos, SP, Brazil), Kazuo Tsushima
(Laborat\'orio de F\'isica Te\'orica e Computacional - LFTC, Universidade
Cruzeiro do Sul / Universidade Cidade de S\~ao Paulo, S\~ao Paulo, Brazil) | Nucleon Electromagnetic and Axial Form Factors in a Light-front
Constituent Quark Model | Pos. style (Latex), 4 eps figures | null | null | LFTC-22-3/71 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we study the effect of the scalar spin coupling of
constituent quarks on the nucleon electroweak properties by introducing a
valence light-front wave function with two momentum scales. By comparing the
results obtained with the one scale and two scale wave function models, we have
found that the last one has shown a reasonable description of the static
observables and $\mu_pG_{Ep}/G_{Mp}$ ratio in which the position of the zero
appears around 10~[GeV/c]$^2$ or for higher squared momentum transfers. We have
also shown results for the axial-vector coupling $g_{A}$ and the nucleon
axial-vector form factor. The best result for $g_A$ was obtained when the
parameters of the nucleon wave function model were such that the experimental
value of the neutron magnetic moment was described.
| [
{
"created": "Tue, 25 Jan 2022 14:23:47 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"de Araújo",
"W. R. B.",
"",
"Secretaria de Educação do Estado de São\n Paulo, Brazil"
],
[
"Suisso",
"E. F.",
"",
"Instituto Nacional de Propriedade Industrial,\n INPI, RJ"
],
[
"de Melo",
"J. P. B. C.",
"",
"Laboratório de Física Teórica e\n Computacion... | In the present work we study the effect of the scalar spin coupling of constituent quarks on the nucleon electroweak properties by introducing a valence light-front wave function with two momentum scales. By comparing the results obtained with the one scale and two scale wave function models, we have found that the last one has shown a reasonable description of the static observables and $\mu_pG_{Ep}/G_{Mp}$ ratio in which the position of the zero appears around 10~[GeV/c]$^2$ or for higher squared momentum transfers. We have also shown results for the axial-vector coupling $g_{A}$ and the nucleon axial-vector form factor. The best result for $g_A$ was obtained when the parameters of the nucleon wave function model were such that the experimental value of the neutron magnetic moment was described. |
0804.2514 | Xiaojun Bi | Xiao-Jun Bi | Big bang nucleosynthesis constrains the total annihilation cross section
of neutralino dark matter | 10 pages, 3 figures; discussions added | null | null | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | Assuming the lightest neutralino forms dark matter, we study its residual
annihilation after freeze-out at the early universe. If taking place after the
big bang nucleosynthesis (BBN) the annihilation products, especially at the
hadronic modes, may cause nonthermal nuclear reaction and change the prediction
of the primordial abundance of light elements in the standard BBN scenario. We
therefore put constraints on the neutralino annihilation cross section. These
constraints are free of the uncertainties of the dark matter profile today
suffered by direct or indirect detection of dark matter. We find the
constraints by BBN is important, especially when taking large $\tan\beta$. If
the light element abundances can be determined with higher precision in the
future the constraint will become very strong, so that a majority of the
parameter space allowed by the relic density requirement may be excluded.
| [
{
"created": "Wed, 16 Apr 2008 07:43:45 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2008 14:02:11 GMT",
"version": "v2"
}
] | 2008-04-17 | [
[
"Bi",
"Xiao-Jun",
""
]
] | Assuming the lightest neutralino forms dark matter, we study its residual annihilation after freeze-out at the early universe. If taking place after the big bang nucleosynthesis (BBN) the annihilation products, especially at the hadronic modes, may cause nonthermal nuclear reaction and change the prediction of the primordial abundance of light elements in the standard BBN scenario. We therefore put constraints on the neutralino annihilation cross section. These constraints are free of the uncertainties of the dark matter profile today suffered by direct or indirect detection of dark matter. We find the constraints by BBN is important, especially when taking large $\tan\beta$. If the light element abundances can be determined with higher precision in the future the constraint will become very strong, so that a majority of the parameter space allowed by the relic density requirement may be excluded. |
hep-ph/0304076 | Nobuhiro Maekawa | Nobuhiro Maekawa | Grand Unification with Anomalous U(1) Symmetry and Non-abelian
Horizontal Symmetry | 10 pages, Talk given at "Strong Coupling Gauge Theories and Effective
Field Theories"(SCGT02) conference at Nagoya, Japan, December 10-13,2002
Reference added | null | 10.1142/9789812795120_0041 | KUNS-1833 | hep-ph | null | Non-abelian horizontal symmetry has been considered to solve potentially SUSY
flavor problem, but simple models are suffering from various problems. In this
talk, we point out that (anomalous) U(1)_A gauge symmetry solves all the
problems in a natural way, especially, in the E_6 grand unified theories.
Combining the GUT scenario with anomalous U(1)_A gauge symmetry, in which
doublet-triplet splitting and natural gauge coupling unification are realized,
and realistic quark and lepton mass matrices are obtained including bi-large
neutrino mixings, complete E_6* SU(3)_H (or E_6*SU(2)_H) GUTs can be obtained,
in which all the three generation quarks and leptons are unified into a single
multiplet (27,3) (or two multiplets (27,2+1)). This talk is based on Ref.[1].
| [
{
"created": "Tue, 8 Apr 2003 03:10:10 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2003 03:30:19 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Maekawa",
"Nobuhiro",
""
]
] | Non-abelian horizontal symmetry has been considered to solve potentially SUSY flavor problem, but simple models are suffering from various problems. In this talk, we point out that (anomalous) U(1)_A gauge symmetry solves all the problems in a natural way, especially, in the E_6 grand unified theories. Combining the GUT scenario with anomalous U(1)_A gauge symmetry, in which doublet-triplet splitting and natural gauge coupling unification are realized, and realistic quark and lepton mass matrices are obtained including bi-large neutrino mixings, complete E_6* SU(3)_H (or E_6*SU(2)_H) GUTs can be obtained, in which all the three generation quarks and leptons are unified into a single multiplet (27,3) (or two multiplets (27,2+1)). This talk is based on Ref.[1]. |
hep-ph/9403309 | Ngee-Pong Chang | Ngee Pong Chang | Chiral Morphing | 14 pages, LaTeX, CCNY-HEP-94-6 Invited contribution to the Marshak
Memorial volume, edited by E.C.G. Sudarshan, to be published by World
Scientific Publishing Co., Singapore, 1994. **** Earlier version had email
bug due to transmission problem | null | null | null | hep-ph | null | Chiral symmetry undergoes a metamorphosis at $T_c$.
For $T < T_c$, the usual Noether charge, $\Qa$, is dynamically broken by the
vacuum. Above $T_c$, chiral symmetry undergoes a subtle change, and the Noether
charge \underline{{\em morphs}} into $\Qbeta$, with the thermal vacuum now
becoming invariant under $\Qbeta$.
This vacuum is however not invariant under the old $\Qa$ transformations.
As a result, the pion remains strictly massless at high $T$.
The pion propagates in the early universe with a halo.
New order parameters are proposed to probe the structure of the new thermal
vacuum.
| [
{
"created": "Fri, 18 Mar 1994 11:35:16 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 1994 17:07:55 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Chang",
"Ngee Pong",
""
]
] | Chiral symmetry undergoes a metamorphosis at $T_c$. For $T < T_c$, the usual Noether charge, $\Qa$, is dynamically broken by the vacuum. Above $T_c$, chiral symmetry undergoes a subtle change, and the Noether charge \underline{{\em morphs}} into $\Qbeta$, with the thermal vacuum now becoming invariant under $\Qbeta$. This vacuum is however not invariant under the old $\Qa$ transformations. As a result, the pion remains strictly massless at high $T$. The pion propagates in the early universe with a halo. New order parameters are proposed to probe the structure of the new thermal vacuum. |
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