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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1001.2679 | Sevda Rzayeva | O. B. Abdinov, F.T. Khalil-zade, S. S. Rzaeva | Electric charge quantization in SU(3)_c X SU(3)_L X U(1)_X model | 9 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Basing on the general photon eigenstate and anomaly cancellation, it is shown
that the electric charge quantization in SU(3)_c X SU(3)_L X U(1)_X model with
exotic particles can be obtained independently on parameters alpha and betta.
The fixation of hypercharges of fermions fields by the Higgs fields and
dependence of the electric charges quantization conditions from the
hypercharges of Higgs fields leads to the fact that the electric charge in the
considered model can be quantized and fixed only in the presence of Higgs
fields. In addition, we have shown that in the considered model the classical
constraints following from the Yukawa interactions are equivalent to the
conditions following from the parity invariance of electromagnetic interaction.
The most general expressions for the gauge bosons masses, eigenstates of
neutral fields and the interactions of leptons and quarks with gauge bosons
have been derived in the arbitrary case
| [
{
"created": "Fri, 15 Jan 2010 12:46:39 GMT",
"version": "v1"
}
] | 2010-01-18 | [
[
"Abdinov",
"O. B.",
""
],
[
"Khalil-zade",
"F. T.",
""
],
[
"Rzaeva",
"S. S.",
""
]
] | Basing on the general photon eigenstate and anomaly cancellation, it is shown that the electric charge quantization in SU(3)_c X SU(3)_L X U(1)_X model with exotic particles can be obtained independently on parameters alpha and betta. The fixation of hypercharges of fermions fields by the Higgs fields and dependence of the electric charges quantization conditions from the hypercharges of Higgs fields leads to the fact that the electric charge in the considered model can be quantized and fixed only in the presence of Higgs fields. In addition, we have shown that in the considered model the classical constraints following from the Yukawa interactions are equivalent to the conditions following from the parity invariance of electromagnetic interaction. The most general expressions for the gauge bosons masses, eigenstates of neutral fields and the interactions of leptons and quarks with gauge bosons have been derived in the arbitrary case |
hep-ph/0509181 | Roman Nikolaevich Lee | A.V. Bogdan and R.N. Lee | Differential equations and high-energy expansion of two--loop diagrams
in D dimensions | 13 pages,8 figures, uses elsart.cls. Misprints corrected | Nucl.Phys. B732 (2006) 169-182 | 10.1016/j.nuclphysb.2005.10.024 | null | hep-ph | null | New method of calculation of master integrals using differential equations
and asymptotical expansion is presented. This method leads to the results exact
in space-time dimension $D$ having the form of the convergent power series. As
an application of this method, we calculate the two--loop master integral for
"crossed--triangle" topology which was previously known only up to $O(\ep)$
order. The case when a topology contains several master integrals is also
considered. We present an algorithm of the term-by-term calculation of the
asymptotical expansion in this case and analyze in detail the "crossed--box"
topology with three master integrals.
| [
{
"created": "Mon, 19 Sep 2005 04:42:42 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2005 10:58:25 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Oct 2005 10:47:19 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Bogdan",
"A. V.",
""
],
[
"Lee",
"R. N.",
""
]
] | New method of calculation of master integrals using differential equations and asymptotical expansion is presented. This method leads to the results exact in space-time dimension $D$ having the form of the convergent power series. As an application of this method, we calculate the two--loop master integral for "crossed--triangle" topology which was previously known only up to $O(\ep)$ order. The case when a topology contains several master integrals is also considered. We present an algorithm of the term-by-term calculation of the asymptotical expansion in this case and analyze in detail the "crossed--box" topology with three master integrals. |
2108.09622 | Yin Jiang | Yin Jiang | Chiral vortical catalysis | 6 pages, 4 figures | null | 10.1140/epjc/s10052-022-10915-8 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Gluon interaction introduces remarkable corrections to the magnetic
polarization effects on the chiral fermions, which is known as the inverse
magnetic catalysis. It is a natural speculation that the vorticity, which has
many similar properties as magnetic field, would bring non-negligible
contribution to the chiral rotational suppression. Using the intuitive
semi-classical background field method we studied the rotation dependence of
the effective strong interaction coupling. Contrary to the magnetic field case
the rotation increases the effective coupling which leads to slowing down the
condensate melting procedure with temperature. This could be named as the
chiral vortical catalysis or inverse rotation suppression. Imposing such
dependence to the coupling in the NJL model, we numerically checked this
analysis qualitatively. The pseudo critical temperature is shown to rise with
the rotation and approach saturation eventually which may be induced by the
model cutoff.
| [
{
"created": "Sun, 22 Aug 2021 02:57:16 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Jiang",
"Yin",
""
]
] | Gluon interaction introduces remarkable corrections to the magnetic polarization effects on the chiral fermions, which is known as the inverse magnetic catalysis. It is a natural speculation that the vorticity, which has many similar properties as magnetic field, would bring non-negligible contribution to the chiral rotational suppression. Using the intuitive semi-classical background field method we studied the rotation dependence of the effective strong interaction coupling. Contrary to the magnetic field case the rotation increases the effective coupling which leads to slowing down the condensate melting procedure with temperature. This could be named as the chiral vortical catalysis or inverse rotation suppression. Imposing such dependence to the coupling in the NJL model, we numerically checked this analysis qualitatively. The pseudo critical temperature is shown to rise with the rotation and approach saturation eventually which may be induced by the model cutoff. |
2202.11892 | Mohammad Sajjad Athar | M. Sajjad Athar, S. K. Singh and F. Zaidi | Nuclear medium effects in lepton-nucleus DIS in the region of $x \gtrsim
1$ | 14 pages, 7 figures and 1 table | null | 10.1103/PhysRevD.105.093002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nuclear medium effects in the nuclear structure functions and
differential cross sections in the deep inelastic scattering (DIS) of charged
lepton and neutrino from nuclear targets are studied in the region of large $x$
including $x\ge 1$. The nuclear medium effects due to the Fermi motion and the
binding energy of nucleons and the nucleon correlations are included using
nucleon spectral function calculated in a microscopic field theoretical model.
The numerical results for the nuclear structure functions and the cross
sections are obtained using the nucleon structure function evaluated at the
next-to-next-to-leading order (NNLO) with the Martin-Motylinski-Harland
Lang-Thorne (MMHT) parameterization of the nucleonic parton distribution
functions (PDFs) and are compared with the available experimental data on
electron scattering from the Jefferson Lab (JLab) and SLAC Nuclear Physics
Facility (NPAS). In the case of neutrino scattering the results are relevant
for understanding the DIS contributions to the recent inclusive cross sections
measured by the Main Injector Neutrino ExpeRiment to study v-A interactions
(MINERvA) as well as theoretical predictions are made for Deep Underground
Neutrino Experiment (DUNE). The importance of isoscalarity corrections in
heavier nuclear targets as well as the effect of the kinematic cut on the CM
energy $W$ in defining the DIS region have also been discussed.
| [
{
"created": "Thu, 24 Feb 2022 04:11:00 GMT",
"version": "v1"
}
] | 2022-05-18 | [
[
"Athar",
"M. Sajjad",
""
],
[
"Singh",
"S. K.",
""
],
[
"Zaidi",
"F.",
""
]
] | The nuclear medium effects in the nuclear structure functions and differential cross sections in the deep inelastic scattering (DIS) of charged lepton and neutrino from nuclear targets are studied in the region of large $x$ including $x\ge 1$. The nuclear medium effects due to the Fermi motion and the binding energy of nucleons and the nucleon correlations are included using nucleon spectral function calculated in a microscopic field theoretical model. The numerical results for the nuclear structure functions and the cross sections are obtained using the nucleon structure function evaluated at the next-to-next-to-leading order (NNLO) with the Martin-Motylinski-Harland Lang-Thorne (MMHT) parameterization of the nucleonic parton distribution functions (PDFs) and are compared with the available experimental data on electron scattering from the Jefferson Lab (JLab) and SLAC Nuclear Physics Facility (NPAS). In the case of neutrino scattering the results are relevant for understanding the DIS contributions to the recent inclusive cross sections measured by the Main Injector Neutrino ExpeRiment to study v-A interactions (MINERvA) as well as theoretical predictions are made for Deep Underground Neutrino Experiment (DUNE). The importance of isoscalarity corrections in heavier nuclear targets as well as the effect of the kinematic cut on the CM energy $W$ in defining the DIS region have also been discussed. |
1402.2244 | Olga Guadalupe F\'elix Beltr\'an Dr. | E. Barradas-Guevara, O. F\'elix-Beltr\'an and E. Rodr\'iguez
J\'auregui | S(3) flavoured Higgs model trilinear self-couplings | 18 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we analyze the Higgs sector of the minimal $S(3)$-invariant
extension of the Standard Model is performed. Considering three Higgs fields,
which are SU(2) doublets, and CP invariant, we compute the exact and analytical
physical Higgs boson masses in terms of the Higgs potential parameters and the
scalar Higgs matrix rotation angle $\theta_S$ and $w_3$
($\tan\theta_P=\tan\theta_C=\tan^{-1}\omega_3$), related to the pseudoscalar
and charged Higgs matrix rotation angles $\theta_P$ and $\theta_C$
respectively. Furthermore, within this model we can also write down in an
explicit form the trilinear self-couplings $\lambda_{ijk}$ in terms of the
Higgs masses and two free parameters, $\theta_S$ and $w_3$. Moreover, we show
that the Higgs masses and trilinear Higgs bosons self-couplings are closely
linked to the Higgs potential structure given by the discrete symmetry $S(3)$,
which can be helpful to distinguish this model from other extensions. In our
analysis the lightest Higgs boson mass is taken to be fixed to 125 GeV. In
concordance with the results reported in the literature for other Standard
Model extensions, it find that the numerical values $\lambda_{ijk}$ of the
minimal $S(3)$-invariant extension of the Standard Model are significantly
different from the trilinear Higgs self-coupling of the Standard Model.
| [
{
"created": "Mon, 10 Feb 2014 19:26:32 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 2014 00:56:43 GMT",
"version": "v2"
}
] | 2014-02-28 | [
[
"Barradas-Guevara",
"E.",
""
],
[
"Félix-Beltrán",
"O.",
""
],
[
"Jáuregui",
"E. Rodríguez",
""
]
] | In this work, we analyze the Higgs sector of the minimal $S(3)$-invariant extension of the Standard Model is performed. Considering three Higgs fields, which are SU(2) doublets, and CP invariant, we compute the exact and analytical physical Higgs boson masses in terms of the Higgs potential parameters and the scalar Higgs matrix rotation angle $\theta_S$ and $w_3$ ($\tan\theta_P=\tan\theta_C=\tan^{-1}\omega_3$), related to the pseudoscalar and charged Higgs matrix rotation angles $\theta_P$ and $\theta_C$ respectively. Furthermore, within this model we can also write down in an explicit form the trilinear self-couplings $\lambda_{ijk}$ in terms of the Higgs masses and two free parameters, $\theta_S$ and $w_3$. Moreover, we show that the Higgs masses and trilinear Higgs bosons self-couplings are closely linked to the Higgs potential structure given by the discrete symmetry $S(3)$, which can be helpful to distinguish this model from other extensions. In our analysis the lightest Higgs boson mass is taken to be fixed to 125 GeV. In concordance with the results reported in the literature for other Standard Model extensions, it find that the numerical values $\lambda_{ijk}$ of the minimal $S(3)$-invariant extension of the Standard Model are significantly different from the trilinear Higgs self-coupling of the Standard Model. |
hep-ph/0303223 | Abdou M. Abdel-Rehim | D. Black, M. Harada and J. Schechter | Study of Scalar Mesons and Related Radiative Decays | 9 pages, 3 figures, Talk presented at SUNYIT (Utica/NY) conference on
High Energy Physics, June 6, 2002 | null | null | SU- 4252-775 | hep-ph | null | After a brief review of the puzzling light scalar meson sector of QCD, a
brief summary will be given of a paper concerning radiative decays involving
the light scalars. There, a simple vector meson dominance model is constructed
in an initial attempt to relate a large number of the radiative decays
involving a putative scalar nonet to each other. As an application it is
illustrated why $a_0(980)-f_0(980)$ mixing is not expected to greatly alter the
$f_0/a_0$ production ratio for radiative $\phi$ decays.
| [
{
"created": "Wed, 26 Mar 2003 17:06:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Black",
"D.",
""
],
[
"Harada",
"M.",
""
],
[
"Schechter",
"J.",
""
]
] | After a brief review of the puzzling light scalar meson sector of QCD, a brief summary will be given of a paper concerning radiative decays involving the light scalars. There, a simple vector meson dominance model is constructed in an initial attempt to relate a large number of the radiative decays involving a putative scalar nonet to each other. As an application it is illustrated why $a_0(980)-f_0(980)$ mixing is not expected to greatly alter the $f_0/a_0$ production ratio for radiative $\phi$ decays. |
hep-ph/0007271 | Jeff Chizma | J. Chizma and G. Karl | Strange quarks, magnetic moments and SU(3) | 2 pages, ReVTeX | null | null | null | hep-ph | null | We discuss the agreement in sign between the recently measured strange
contribution to the proton magnetic moment and SU(3) based fits to baryon octet
magnetic moments.
| [
{
"created": "Mon, 24 Jul 2000 21:16:46 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2000 22:14:58 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chizma",
"J.",
""
],
[
"Karl",
"G.",
""
]
] | We discuss the agreement in sign between the recently measured strange contribution to the proton magnetic moment and SU(3) based fits to baryon octet magnetic moments. |
2208.14186 | Andrei Egorov | Andrei E. Egorov | Updated constraints on WIMP dark matter by radio observations of M31 --
all annihilation channels | 8 pages, 2 figures, this paper complements arXiv:2205.01033, was
presented at the 27th European Cosmic Ray Symposium (ECRS-2022) | PoS 423, 120 (2023) | 10.22323/1.423.0120 | null | hep-ph astro-ph.CO astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | The present work derived the robust constraints on annihilating WIMP
parameters utilizing new radio observations of M31, as well as new studies of
its DM distribution and other properties. The characteristics of emission due
to DM annihilation were computed in the frame of 2D galactic model employing
GALPROP code adapted specifically for M31. This enabled us to refine various
inaccuracies of previous studies on the subject. DM constraints were obtained
for all possible annihilation channels except $\chi\chi \rightarrow
\gamma\gamma,\nu\bar{\nu}$. A wide variety of radio data was utilized in the
frequency range $\approx$(0.1--10) GHz. As the result the thermal WIMP lighter
than fiducially $\approx$(40--70) GeV was excluded in the case of light primary
annihilation products $\chi\chi \rightarrow
\tau^+\tau^-,\mu^+\mu^-,gg,c\overline{c},u\overline{u},d\overline{d},s\overline{s},e^+e^-,b\overline{b}$
(and an arbitrary combination of them). Heavier WIMP, which can annihilate to
$W^+W^-,Z^0Z^0,t\overline{t},hh$; can not be probed at the level of thermal
cross section, unless one assumes the optimistic cases of DM density and
magnetic field distributions in M31. In summary, $m_x \gtrsim 40$ GeV
represents the fiducial channel-independent mass limit for the thermal WIMP
with the full uncertainty range estimated to be $\approx$(20--90) GeV. The
obtained exclusions are competitive to those from Fermi-LAT observations of
dwarfs and AMS-02 measurements of antiprotons. Our constraints significantly
restrict the opportunity to explain the gamma-ray outer halo of M31 by
annihilating DM. And, finally, we questioned the possibility claimed in other
studies to robustly constrain heavy thermal WIMP with $m_x > 100$ GeV by radio
data on M31.
| [
{
"created": "Tue, 30 Aug 2022 12:06:12 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 12:54:33 GMT",
"version": "v2"
}
] | 2023-02-21 | [
[
"Egorov",
"Andrei E.",
""
]
] | The present work derived the robust constraints on annihilating WIMP parameters utilizing new radio observations of M31, as well as new studies of its DM distribution and other properties. The characteristics of emission due to DM annihilation were computed in the frame of 2D galactic model employing GALPROP code adapted specifically for M31. This enabled us to refine various inaccuracies of previous studies on the subject. DM constraints were obtained for all possible annihilation channels except $\chi\chi \rightarrow \gamma\gamma,\nu\bar{\nu}$. A wide variety of radio data was utilized in the frequency range $\approx$(0.1--10) GHz. As the result the thermal WIMP lighter than fiducially $\approx$(40--70) GeV was excluded in the case of light primary annihilation products $\chi\chi \rightarrow \tau^+\tau^-,\mu^+\mu^-,gg,c\overline{c},u\overline{u},d\overline{d},s\overline{s},e^+e^-,b\overline{b}$ (and an arbitrary combination of them). Heavier WIMP, which can annihilate to $W^+W^-,Z^0Z^0,t\overline{t},hh$; can not be probed at the level of thermal cross section, unless one assumes the optimistic cases of DM density and magnetic field distributions in M31. In summary, $m_x \gtrsim 40$ GeV represents the fiducial channel-independent mass limit for the thermal WIMP with the full uncertainty range estimated to be $\approx$(20--90) GeV. The obtained exclusions are competitive to those from Fermi-LAT observations of dwarfs and AMS-02 measurements of antiprotons. Our constraints significantly restrict the opportunity to explain the gamma-ray outer halo of M31 by annihilating DM. And, finally, we questioned the possibility claimed in other studies to robustly constrain heavy thermal WIMP with $m_x > 100$ GeV by radio data on M31. |
2110.15575 | Christopher Flett | Chris A. Flett, Stephen P. Jones, Alan D. Martin, Misha G. Ryskin,
Thomas Teubner | Predictions of exclusive $\Upsilon$ photoproduction at the LHC and
future colliders | 9 pages, 2 figures, 1 table | null | 10.1103/PhysRevD.105.034008 | HIP-2021-33/TH, IPPP/21/45, LTH 1273 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The cross section for exclusive $\Upsilon$ ultraperipheral photoproduction at
present and future colliders is determined using the low $x$ gluon PDF
extracted from an analysis of exclusive $J/\psi$ measurements performed at HERA
and the LHC. Predictions are given at next-to-leading order in collinear
factorisation over a wide $\gamma p$ centre-of-mass energy range, calculated
assuming the non-relativistic approximation for the $\Upsilon$ wave function,
and with skewing corrections incorporated.
| [
{
"created": "Fri, 29 Oct 2021 06:41:32 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Flett",
"Chris A.",
""
],
[
"Jones",
"Stephen P.",
""
],
[
"Martin",
"Alan D.",
""
],
[
"Ryskin",
"Misha G.",
""
],
[
"Teubner",
"Thomas",
""
]
] | The cross section for exclusive $\Upsilon$ ultraperipheral photoproduction at present and future colliders is determined using the low $x$ gluon PDF extracted from an analysis of exclusive $J/\psi$ measurements performed at HERA and the LHC. Predictions are given at next-to-leading order in collinear factorisation over a wide $\gamma p$ centre-of-mass energy range, calculated assuming the non-relativistic approximation for the $\Upsilon$ wave function, and with skewing corrections incorporated. |
2110.03925 | Yusuke Mikura | Yusuke Mikura, Yuichiro Tada | On UV-completion of Palatini-Higgs inflation | 22 pages; v2 matches the published version in JCAP | JCAP05(2022)035 | 10.1088/1475-7516/2022/05/035 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the UV-completion of the Higgs inflation in the metric and the
Palatini formalisms. It is known that the cutoff scales for the perturbative
unitarity of these inflation models become much smaller than the Planck scale
to be consistent with observations. Expecting that the low cutoff scale
originates in the curvature of a field-space spanned by the Higgs fields, we
consider embedding the curved field-space into a higher dimensional flat space
and apply this procedure to the metric-Higgs and the Palatini-Higgs scenarios.
The new field introduced in this way successfully flattens the field-space and
UV-completes the Higgs inflation in the metric formalism. However, in the
Palatini formalism, the new field cannot uplift the cutoff up to the Planck
scale. We also discuss the unavoidable low cutoff in the Palatini formalism in
the context of the local conformal symmetry.
| [
{
"created": "Fri, 8 Oct 2021 06:53:57 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2022 08:46:17 GMT",
"version": "v2"
}
] | 2022-05-27 | [
[
"Mikura",
"Yusuke",
""
],
[
"Tada",
"Yuichiro",
""
]
] | We investigate the UV-completion of the Higgs inflation in the metric and the Palatini formalisms. It is known that the cutoff scales for the perturbative unitarity of these inflation models become much smaller than the Planck scale to be consistent with observations. Expecting that the low cutoff scale originates in the curvature of a field-space spanned by the Higgs fields, we consider embedding the curved field-space into a higher dimensional flat space and apply this procedure to the metric-Higgs and the Palatini-Higgs scenarios. The new field introduced in this way successfully flattens the field-space and UV-completes the Higgs inflation in the metric formalism. However, in the Palatini formalism, the new field cannot uplift the cutoff up to the Planck scale. We also discuss the unavoidable low cutoff in the Palatini formalism in the context of the local conformal symmetry. |
1311.4017 | Hongshi Zong | Liu-jun Luo, Jing Cao, Yan Yan, Wei-Min Sun and Hong-Shi Zong | A thermodynamically consistent quasi-particle model without
density-dependent infinity of the vacuum zero point energy | null | Eur. Phys. J. C (2013) 73:2626 | 10.1140/epjc/s10052-013-2626-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we generalize the improved quasi-particle model proposed in J.
Cao et al., [ Phys. Lett. B {\bf711}, 65 (2012)] from finite temperature and
zero chemical potential to the case of finite chemical potential and zero
temperature, and calculate the equation of state (EOS) for (2+1) flavor Quantum
Chromodynamics (QCD) at zero temperature and high density. We first calculate
the partition function at finite temperature and chemical potential, then go to
the limit $T=0$ and obtain the equation of state (EOS) for cold and dense QCD,
which is important for the study of neutron stars. Furthermore, we use this EOS
to calculate the quark-number density, the energy density, the quark-number
susceptibility and the speed of sound at zero temperature and finite chemical
potential and compare our results with the corresponding ones in the existing
literature.
| [
{
"created": "Sat, 16 Nov 2013 04:33:42 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2013 02:04:57 GMT",
"version": "v2"
}
] | 2013-11-20 | [
[
"Luo",
"Liu-jun",
""
],
[
"Cao",
"Jing",
""
],
[
"Yan",
"Yan",
""
],
[
"Sun",
"Wei-Min",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | In this paper, we generalize the improved quasi-particle model proposed in J. Cao et al., [ Phys. Lett. B {\bf711}, 65 (2012)] from finite temperature and zero chemical potential to the case of finite chemical potential and zero temperature, and calculate the equation of state (EOS) for (2+1) flavor Quantum Chromodynamics (QCD) at zero temperature and high density. We first calculate the partition function at finite temperature and chemical potential, then go to the limit $T=0$ and obtain the equation of state (EOS) for cold and dense QCD, which is important for the study of neutron stars. Furthermore, we use this EOS to calculate the quark-number density, the energy density, the quark-number susceptibility and the speed of sound at zero temperature and finite chemical potential and compare our results with the corresponding ones in the existing literature. |
1905.06918 | Aditya Mishra | Aditya Nath Mishra and Guy Pai\'c | Parton energy loss in pp collisions at very high multiplicity | 13 pages, 7 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results for the evolution of transverse momentum spectra for
the jetty and underlying parts of events as a function of multiplicity in pp
collisions at 13 TeV measured at midrapidity ($\left|\eta\right|<0.8$) using
PYTHIA8 event generator. The main characteristic of the approach is that it
reaches to extreme multiplicities not yet explored by the experiments. We
demonstrate that the behavior of both the underlying and hard components are
affected by the multiplicity of the events i.e. the energy density. The
behavior of the spectra at very high multiplicities suggests that the partons
suffer energy loss compensated by an increase in the multiplicity of events.
| [
{
"created": "Thu, 16 May 2019 17:30:55 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2019 21:41:49 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Feb 2020 21:10:17 GMT",
"version": "v3"
}
] | 2020-02-26 | [
[
"Mishra",
"Aditya Nath",
""
],
[
"Paić",
"Guy",
""
]
] | We present the results for the evolution of transverse momentum spectra for the jetty and underlying parts of events as a function of multiplicity in pp collisions at 13 TeV measured at midrapidity ($\left|\eta\right|<0.8$) using PYTHIA8 event generator. The main characteristic of the approach is that it reaches to extreme multiplicities not yet explored by the experiments. We demonstrate that the behavior of both the underlying and hard components are affected by the multiplicity of the events i.e. the energy density. The behavior of the spectra at very high multiplicities suggests that the partons suffer energy loss compensated by an increase in the multiplicity of events. |
1302.1487 | Christopher T. Hill | Christopher T. Hill | "Super"-Dilatation Symmetry of the Top-Higgs System | Invited Plenary Talk at SCGT12, "KMI-GCOE Workshop on Strong Coupling
Gauge Theories in the LHC Perspective", 4-7 Dec. 2012, Nagoya University | null | 10.1103/PhysRevD.87.065002 | FERMILAB-CONF-13-039-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The top-Higgs system, consisting of top quark (LH doublet, RH singlet) and
Higgs boson kinetic terms, with gauge fields set to zero, has an exact (modulo
total divergences) symmetry where both fermion and Higgs fields are shifted and
mixed in a supersymmetric fashion. The full Higgs-Yukawa interaction and
Higgs-potential, including additional \sim 1/\Lambda^2 NJL-like interactions,
also has this symmetry to O(1/\Lambda^4), up to null-operators. Thus the
interaction lagrangian can be viewed as a power series in 1/\Lambda^2. The
symmetry involves interplay of the Higgs quartic interaction with the
Higgs-Yukawa interaction and implies the relationship, \lambda = \half g^2
between the top--Yukawa coupling, g, and Higgs quartic coupling, \lambda, at a
high energy scale \Lambda >= few TeV. We interpret this to be a new physics
scale. The top quark is massless in the symmetric phase, satisfying the
Nambu-Goldstone theorem. The fermionic shift part of the current is \propto
(1-H^\dagger H/v^2), owing to the interplay of \lambda and g, and vanishes in
the broken phase. Hence the Nambu-Goldstone theorem is trivially evaded in the
broken phase and the top quark becomes heavy (it is not a Goldstino). We have
m_t=m_h, subject to radiative corrections that can in principle pull the Higgs
into concordance with experiment.
| [
{
"created": "Wed, 6 Feb 2013 19:36:28 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2013 19:43:23 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Hill",
"Christopher T.",
""
]
] | The top-Higgs system, consisting of top quark (LH doublet, RH singlet) and Higgs boson kinetic terms, with gauge fields set to zero, has an exact (modulo total divergences) symmetry where both fermion and Higgs fields are shifted and mixed in a supersymmetric fashion. The full Higgs-Yukawa interaction and Higgs-potential, including additional \sim 1/\Lambda^2 NJL-like interactions, also has this symmetry to O(1/\Lambda^4), up to null-operators. Thus the interaction lagrangian can be viewed as a power series in 1/\Lambda^2. The symmetry involves interplay of the Higgs quartic interaction with the Higgs-Yukawa interaction and implies the relationship, \lambda = \half g^2 between the top--Yukawa coupling, g, and Higgs quartic coupling, \lambda, at a high energy scale \Lambda >= few TeV. We interpret this to be a new physics scale. The top quark is massless in the symmetric phase, satisfying the Nambu-Goldstone theorem. The fermionic shift part of the current is \propto (1-H^\dagger H/v^2), owing to the interplay of \lambda and g, and vanishes in the broken phase. Hence the Nambu-Goldstone theorem is trivially evaded in the broken phase and the top quark becomes heavy (it is not a Goldstino). We have m_t=m_h, subject to radiative corrections that can in principle pull the Higgs into concordance with experiment. |
2301.06942 | Anirudhan A. Madathil | Mathew Thomas Arun, Anirudhan A. Madathil | Tri-bimaximal-Cabibbo Mixing: Flavour violations in the charged lepton
sector | 13 pages, 10 figures | Eur. Phys. J. C (2023) 83:484 | 10.1140/epjc/s10052-023-11636-2 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The well understood structure of $U_{pmns}$ matrix mandates a Cabibbo mixing
matrix in the first two generations of the charged lepton sector if we assume
Tri-bimaximal mixing in the neutrino sector. This ansatz, called
Tri-bimaximal-Cabibbo mixing, is ruled out immediately by the experiments
searching for charged lepton flavour violating currents. In this article, we
aim to show that the resurrection of the theoretically well motivated
Tri-bimaximal mixing scenario comes naturally within Minimal Flavour Violation
hypothesis in the lepton sector. We analyse the flavour violating currents
$\mu\rightarrow e e e$, $\mu Ti \to e Ti$, $\mu \rightarrow e \gamma$,
$\pi^0\rightarrow e^+ \mu^{-}$ and $K_L \rightarrow \mu^+ e^-$ in this scenario
and show that the New Physics that generates mixing among the charged lepton
could lie within the reach of hadron colliders. In the minimal field content
scenario, though the most stringent constrain on New Physics is $\gtrsim
\mathcal{O}(10$ TeV) for maximal coupling, considering more natural couplings
relaxes it to $\gtrsim \mathcal{O}(4$ TeV). On the other hand, New Physics with
the extended field content is even more strongly constrained to $\gtrsim
\mathcal{O}(75$ TeV) for maximal coupling, while it gets relaxed to $\gtrsim
\mathcal{O}(31$ TeV) for natural scenario.
| [
{
"created": "Tue, 17 Jan 2023 15:05:53 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jun 2023 09:25:44 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Arun",
"Mathew Thomas",
""
],
[
"Madathil",
"Anirudhan A.",
""
]
] | The well understood structure of $U_{pmns}$ matrix mandates a Cabibbo mixing matrix in the first two generations of the charged lepton sector if we assume Tri-bimaximal mixing in the neutrino sector. This ansatz, called Tri-bimaximal-Cabibbo mixing, is ruled out immediately by the experiments searching for charged lepton flavour violating currents. In this article, we aim to show that the resurrection of the theoretically well motivated Tri-bimaximal mixing scenario comes naturally within Minimal Flavour Violation hypothesis in the lepton sector. We analyse the flavour violating currents $\mu\rightarrow e e e$, $\mu Ti \to e Ti$, $\mu \rightarrow e \gamma$, $\pi^0\rightarrow e^+ \mu^{-}$ and $K_L \rightarrow \mu^+ e^-$ in this scenario and show that the New Physics that generates mixing among the charged lepton could lie within the reach of hadron colliders. In the minimal field content scenario, though the most stringent constrain on New Physics is $\gtrsim \mathcal{O}(10$ TeV) for maximal coupling, considering more natural couplings relaxes it to $\gtrsim \mathcal{O}(4$ TeV). On the other hand, New Physics with the extended field content is even more strongly constrained to $\gtrsim \mathcal{O}(75$ TeV) for maximal coupling, while it gets relaxed to $\gtrsim \mathcal{O}(31$ TeV) for natural scenario. |
1409.6607 | Marco Radici | Marco Radici, A. Courtoy, Alessandro Bacchetta | Dihadron Fragmentation Functions and Transversity | 5 pages, 4 figures; extracted from the proceedings of the 4th
International Workshop on Transverse Polarization Phenomena in Hard Processes
(Transversity 2014), 9-13 June 2014, Chia (Cagliari - Italy); EPJ Web of
Conferences LaTeX style | null | 10.1051/epjconf/20158502025 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present preliminary results for an updated extraction of the transversity
parton distribution based on the analysis of pion-pair production in
deep-inelastic scattering off transversely polarized targets in collinear
factorization. Data for proton and deuteron targets by HERMES and COMPASS allow
for a flavor separation of the valence components of transversity, while
di-hadron fragmentation functions are taken from the semi-inclusive production
of two pion pairs in back-to-back jets in $e^+ e^-$ annihilation. The latter
data from Belle have been reanalyzed using the replica method and a more
realistic estimate of the uncertainties on the chiral-odd interference
fragmentation function has been obtained. After encoding this piece of
information into the deep-inelastic scattering cross section, the transversity
has been re-extracted by using the most recent and more precise COMPASS data
for proton target. This picture represents the current most realistic estimate
of the uncertainties on our knowledge of transversity. The preliminary results
indicate that the valence up component seems smaller and with a narrower error
band than in previous extraction.
| [
{
"created": "Tue, 23 Sep 2014 15:28:03 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Radici",
"Marco",
""
],
[
"Courtoy",
"A.",
""
],
[
"Bacchetta",
"Alessandro",
""
]
] | We present preliminary results for an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data for proton and deuteron targets by HERMES and COMPASS allow for a flavor separation of the valence components of transversity, while di-hadron fragmentation functions are taken from the semi-inclusive production of two pion pairs in back-to-back jets in $e^+ e^-$ annihilation. The latter data from Belle have been reanalyzed using the replica method and a more realistic estimate of the uncertainties on the chiral-odd interference fragmentation function has been obtained. After encoding this piece of information into the deep-inelastic scattering cross section, the transversity has been re-extracted by using the most recent and more precise COMPASS data for proton target. This picture represents the current most realistic estimate of the uncertainties on our knowledge of transversity. The preliminary results indicate that the valence up component seems smaller and with a narrower error band than in previous extraction. |
hep-ph/0201241 | Savely G. Karshenboim | Savely G. Karshenboim (D. I. Mendeleev Institute for Metrology, St.
Petersburg and Max-Planck-Institut fuer Quantenoptik, Garching) | Precision study of positronium and precision tests of the bound state
QED | A talk presented at 9th International Workshop on Slow Positron Beam
Techniques for Solids and Surfaces (SLOPOS), Dresden, 2001 | Appl.Surf.Sci. 194 (2002) 307-311 | 10.1016/S0169-4332(02)00140-X | null | hep-ph | null | Despite its very short lifetime positronium provides us with a number of
accurate tests of the bound state QED. In this note a brief overview of QED
theory and precision experiments on the spectrum and annihilation decay of the
positronium atom is presented. Special attention is paid to the accuracy of
theoretical predictions.
| [
{
"created": "Fri, 25 Jan 2002 11:41:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Karshenboim",
"Savely G.",
"",
"D. I. Mendeleev Institute for Metrology, St.\n Petersburg and Max-Planck-Institut fuer Quantenoptik, Garching"
]
] | Despite its very short lifetime positronium provides us with a number of accurate tests of the bound state QED. In this note a brief overview of QED theory and precision experiments on the spectrum and annihilation decay of the positronium atom is presented. Special attention is paid to the accuracy of theoretical predictions. |
2108.08511 | Yi Chung | Yi Chung | A Flavorful Composite Higgs Model : Connecting the B anomalies with the
hierarchy problem | 10 pages, 3 figure, 1 tables; v2: matches version accepted for
publication in PRD | Phys. Rev. D 104, 115027 (2021) | 10.1103/PhysRevD.104.115027 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a model which connects the neutral current B anomalies with
composite Higgs models. The model is based on the minimal fundamental composite
Higgs model with $SU(4)/Sp(4)$ coset. The strong dynamics spontaneously break
the symmetry and introduce five Nambu-Goldstone bosons. Four of them become the
Standard Model Higgs doublet and the last one, corresponding to the broken
local $U(1)'$ symmetry, is eaten by the gauge boson. This leads to an
additional TeV-scale $Z'$ boson, which can explain the recent B anomalies. The
experimental constraints and allowed parameter space are discussed in detail.
| [
{
"created": "Thu, 19 Aug 2021 06:00:45 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jan 2022 22:03:12 GMT",
"version": "v2"
}
] | 2022-01-04 | [
[
"Chung",
"Yi",
""
]
] | We present a model which connects the neutral current B anomalies with composite Higgs models. The model is based on the minimal fundamental composite Higgs model with $SU(4)/Sp(4)$ coset. The strong dynamics spontaneously break the symmetry and introduce five Nambu-Goldstone bosons. Four of them become the Standard Model Higgs doublet and the last one, corresponding to the broken local $U(1)'$ symmetry, is eaten by the gauge boson. This leads to an additional TeV-scale $Z'$ boson, which can explain the recent B anomalies. The experimental constraints and allowed parameter space are discussed in detail. |
1309.4777 | Matthew Low | David Krohn, Matthew Low, Matthew D. Schwartz, Lian-Tao Wang | Jet Cleansing: Pileup Removal at High Luminosity | v2: 7 pages, 6 figures, 2 tables, added references, added details on
trimming and on the simulation | Phys. Rev. D 90, 065020 (2014) | 10.1103/PhysRevD.90.065020 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the greatest impediments to extracting useful information from high
luminosity hadron-collider data is radiation from secondary collisions (i.e.
pileup) which can overlap with that of the primary interaction. In this paper
we introduce a simple jet-substructure technique termed cleansing which can
consistently correct for large amounts of pileup in an observable independent
way. Cleansing works at the subjet level, combining tracker and
calorimeter-based data to reconstruct the pileup-free primary interaction. The
technique can be used on its own, with various degrees of sophistication, or in
concert with jet grooming. We apply cleansing to both kinematic and jet shape
reconstruction, finding in all cases a marked improvement over previous methods
both in the correlation of the cleansed data with uncontaminated results and in
measures like S/rt(B). Cleansing should improve the sensitivity of new-physics
searches at high luminosity and could also aid in the comparison of precision
QCD calculations to collider data.
| [
{
"created": "Wed, 18 Sep 2013 20:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Sep 2014 20:00:08 GMT",
"version": "v2"
}
] | 2014-10-03 | [
[
"Krohn",
"David",
""
],
[
"Low",
"Matthew",
""
],
[
"Schwartz",
"Matthew D.",
""
],
[
"Wang",
"Lian-Tao",
""
]
] | One of the greatest impediments to extracting useful information from high luminosity hadron-collider data is radiation from secondary collisions (i.e. pileup) which can overlap with that of the primary interaction. In this paper we introduce a simple jet-substructure technique termed cleansing which can consistently correct for large amounts of pileup in an observable independent way. Cleansing works at the subjet level, combining tracker and calorimeter-based data to reconstruct the pileup-free primary interaction. The technique can be used on its own, with various degrees of sophistication, or in concert with jet grooming. We apply cleansing to both kinematic and jet shape reconstruction, finding in all cases a marked improvement over previous methods both in the correlation of the cleansed data with uncontaminated results and in measures like S/rt(B). Cleansing should improve the sensitivity of new-physics searches at high luminosity and could also aid in the comparison of precision QCD calculations to collider data. |
1904.07509 | Zhiguang Xiao | Zhi-Yong Zhou, Meng-Ting Yu and Zhiguang Xiao | Decays of $X(3872)$ to $\chi_{cJ}\pi^0$ and $J/\psi\pi^+\pi^-$ | 7 pages, 3 figures; v2, some corrections and minor modification of
the discussion. Final published version | Phys. Rev. D 100, 094025 (2019) | 10.1103/PhysRevD.100.094025 | USTC-ICTS-19-08 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By describing the $X(3872)$ using the extended Friedrichs scheme, in which
$D\bar D^*$ is the dominant component, we calculate the decay rates of the
$X(3872)$ to $\pi^0$ and a $P$-wave charmonium $\chi_{cJ}$ state with $J=0,1$,
or $2$, and its decays to $J/\psi\pi^+\pi^-$ where $\pi^+\pi^-$ are assumed to
be produced via an intermediate $\rho$ state. The decay widths of
$X(3872)\to\chi_{cJ}\pi^0$ for $J=0,1,2$ are of the same order. However, this
model calculation exhibits that the decay rate of $X(3872)$ to $\chi_{c1}\pi^0$
is one order of magnitude smaller than its decay rate to $J/\psi\pi^+\pi^-$.
| [
{
"created": "Tue, 16 Apr 2019 07:45:25 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jan 2020 07:51:56 GMT",
"version": "v2"
}
] | 2020-01-07 | [
[
"Zhou",
"Zhi-Yong",
""
],
[
"Yu",
"Meng-Ting",
""
],
[
"Xiao",
"Zhiguang",
""
]
] | By describing the $X(3872)$ using the extended Friedrichs scheme, in which $D\bar D^*$ is the dominant component, we calculate the decay rates of the $X(3872)$ to $\pi^0$ and a $P$-wave charmonium $\chi_{cJ}$ state with $J=0,1$, or $2$, and its decays to $J/\psi\pi^+\pi^-$ where $\pi^+\pi^-$ are assumed to be produced via an intermediate $\rho$ state. The decay widths of $X(3872)\to\chi_{cJ}\pi^0$ for $J=0,1,2$ are of the same order. However, this model calculation exhibits that the decay rate of $X(3872)$ to $\chi_{c1}\pi^0$ is one order of magnitude smaller than its decay rate to $J/\psi\pi^+\pi^-$. |
hep-ph/9501214 | A. D. Martin | V.S. Fadin (Budker Institute for Nuclear Physics and Novosibirsk State
University), V.A. Khoze and A.D. Martin (Dept. of Physics, Univ. of Durham,
U.K.), A. Chapovsky (Novosibirsk State University) | COULOMB EFFECTS IN W+ W- PRODUCTION | 22 pages in LATEX | Phys.Rev. D52 (1995) 1377-1385 | 10.1103/PhysRevD.52.1377 | DTP/94/116 | hep-ph | null | We calculate the Coulomb effects on the cross section for e+ e- --> W+ W-
taking into account the instability of the W bosons. We carefully explain the
consequences of instability throughout the energy range which will be
accessible at LEP2. We present a formula which allows these effects to be
easily implemented.
| [
{
"created": "Thu, 5 Jan 1995 10:01:39 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Fadin",
"V. S.",
"",
"Budker Institute for Nuclear Physics and Novosibirsk State\n University"
],
[
"Khoze",
"V. A.",
"",
"Dept. of Physics, Univ. of Durham,\n U.K."
],
[
"Martin",
"A. D.",
"",
"Dept. of Physics, Univ. of Durham,\n U.K."
],
[
"Chapovsky",
"A.",
"",
"Novosibirsk State University"
]
] | We calculate the Coulomb effects on the cross section for e+ e- --> W+ W- taking into account the instability of the W bosons. We carefully explain the consequences of instability throughout the energy range which will be accessible at LEP2. We present a formula which allows these effects to be easily implemented. |
1206.5641 | Jeonghyeon Song | Tao Han, Ian-Woo Kim, and Jeonghyeon Song | Kinematic Cusps with Two Missing Particles II: Cascade Decay Topology | references added, 31 pages with 21 figures and 3 tables | null | 10.1103/PhysRevD.87.035004 | PITT-PACC 1204 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Three-step cascade decays into two invisible particles and two visible
particles via two intermediate on-shell particles develop cusped peak
structures in several kinematic distributions. We study the basic properties of
the cusps and endpoints in various distributions and demonstrate that the
masses of the missing particles and the intermediate particles can be
determined by the cusp and endpoint positions. Effects from realistic
considerations such as finite decay widths, longitudinal boost of the parent
particle, and spin correlations are shown to be under control for the processes
illustrated.
| [
{
"created": "Mon, 25 Jun 2012 10:54:44 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2012 06:02:09 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Han",
"Tao",
""
],
[
"Kim",
"Ian-Woo",
""
],
[
"Song",
"Jeonghyeon",
""
]
] | Three-step cascade decays into two invisible particles and two visible particles via two intermediate on-shell particles develop cusped peak structures in several kinematic distributions. We study the basic properties of the cusps and endpoints in various distributions and demonstrate that the masses of the missing particles and the intermediate particles can be determined by the cusp and endpoint positions. Effects from realistic considerations such as finite decay widths, longitudinal boost of the parent particle, and spin correlations are shown to be under control for the processes illustrated. |
0902.2752 | John LoSecco | John M. Losecco | Muon Oscillations | The actual oscillation distance is the distance between the neutrino
flavor eigenstate and the muon. This was not made clear in the article | null | null | UNDPDK-090208 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Muons produced via the $\pi \to \mu \nu_{\mu}$ decay are in a coherent
superposition of energy states because the $\nu_{\mu}$ is not a mass
eigenstate. This presents an opportunity to access neutrino mixing parameters
via muon decay. The oscillation period is long compared to the muon lifetime
which presents some experimental challenges.
| [
{
"created": "Mon, 16 Feb 2009 18:33:04 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 2009 15:11:48 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Feb 2019 16:03:16 GMT",
"version": "v3"
}
] | 2019-02-06 | [
[
"Losecco",
"John M.",
""
]
] | Muons produced via the $\pi \to \mu \nu_{\mu}$ decay are in a coherent superposition of energy states because the $\nu_{\mu}$ is not a mass eigenstate. This presents an opportunity to access neutrino mixing parameters via muon decay. The oscillation period is long compared to the muon lifetime which presents some experimental challenges. |
hep-ph/9812489 | Alex Pomarol | A. Delgado, A. Pomarol, M. Quiros | Supersymmetry and Electroweak breaking from extra dimensions at the
TeV-scale | 27 pages, Latex, 7 figures. Minor changes | Phys.Rev. D60 (1999) 095008 | 10.1103/PhysRevD.60.095008 | null | hep-ph hep-th | null | We analyze some features of the role that extra dimensions, of radius $R$ in
the TeV$^{-1}$ range, can play in the soft breaking of supersymmetry and the
spontaneous breaking of electroweak symmetry. We use a minimal model where the
gauge and Higgs sector of the MSSM are living in the bulk of five dimensions
and the chiral multiplets in a four-dimensional boundary. Supersymmetry is
broken in the bulk by the Scherk-Schwarz mechanism and transmitted to the
boundary by radiative corrections. The particle spectrum is completely
predicted as a function of a unique $R$-charge. The massless sector corresponds
to the pure Standard Model and electroweak symmetry is radiatively broken with
a light Higgs weighing $\simlt$ 110 GeV. The $\mu$-problem is solved and
Higgsinos, gauginos and heavy Higgses acquire masses $\sim 1/R$. Chiral
sfermions acquire radiative squared-masses $\sim \alpha_i/R^2$. The effective
potential is explicitly computed in the bulk of extra dimensions and some
cosmological consequences can be immediately drawn from it. Gauge coupling
running and unification is studied in the presence of Scherk-Schwarz
supersymmetry breaking. The unification is similar to that in the
supersymmetric theory.
| [
{
"created": "Wed, 23 Dec 1998 18:24:08 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 1999 16:03:02 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Delgado",
"A.",
""
],
[
"Pomarol",
"A.",
""
],
[
"Quiros",
"M.",
""
]
] | We analyze some features of the role that extra dimensions, of radius $R$ in the TeV$^{-1}$ range, can play in the soft breaking of supersymmetry and the spontaneous breaking of electroweak symmetry. We use a minimal model where the gauge and Higgs sector of the MSSM are living in the bulk of five dimensions and the chiral multiplets in a four-dimensional boundary. Supersymmetry is broken in the bulk by the Scherk-Schwarz mechanism and transmitted to the boundary by radiative corrections. The particle spectrum is completely predicted as a function of a unique $R$-charge. The massless sector corresponds to the pure Standard Model and electroweak symmetry is radiatively broken with a light Higgs weighing $\simlt$ 110 GeV. The $\mu$-problem is solved and Higgsinos, gauginos and heavy Higgses acquire masses $\sim 1/R$. Chiral sfermions acquire radiative squared-masses $\sim \alpha_i/R^2$. The effective potential is explicitly computed in the bulk of extra dimensions and some cosmological consequences can be immediately drawn from it. Gauge coupling running and unification is studied in the presence of Scherk-Schwarz supersymmetry breaking. The unification is similar to that in the supersymmetric theory. |
2310.18179 | Joseph Karpie | J. Karpie, R. M. Whitehill, W. Melnitchouk, C. Monahan, K. Orginos,
J.-W. Qiu, D. G. Richards, N. Sato, S. Zafeiropoulos | Gluon helicity from global analysis of experimental data and lattice QCD
Ioffe time distributions | 24 pages, 7 figures | null | null | JLAB-THY-23-3950 | hep-ph hep-lat | http://creativecommons.org/licenses/by/4.0/ | We perform a new global analysis of spin-dependent parton distribution
functions with the inclusion of Ioffe time pseudo-distributions computed in
lattice QCD (LQCD), which are directly sensitive to the gluon helicity
distribution, $\Delta g$. These lattice data have an analogous relationship to
parton distributions as do experimental cross sections, and can be readily
included in global analyses. We focus in particular on the constraining
capability of current LQCD data on the sign of $\Delta g$ at intermediate
parton momentum fractions $x$, which was recently brought into question by
analysis of data in the absence of parton positivity constraints. We find that
present LQCD data cannot discriminate between positive and negative $\Delta g$
solutions, although significant changes in the solutions for both the gluon and
quark sectors are observed.
| [
{
"created": "Fri, 27 Oct 2023 14:46:46 GMT",
"version": "v1"
}
] | 2023-10-31 | [
[
"Karpie",
"J.",
""
],
[
"Whitehill",
"R. M.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Monahan",
"C.",
""
],
[
"Orginos",
"K.",
""
],
[
"Qiu",
"J. -W.",
""
],
[
"Richards",
"D. G.",
""
],
[
"Sato",
"N.",
""
],
[
"Zafeiropoulos",
"S.",
""
]
] | We perform a new global analysis of spin-dependent parton distribution functions with the inclusion of Ioffe time pseudo-distributions computed in lattice QCD (LQCD), which are directly sensitive to the gluon helicity distribution, $\Delta g$. These lattice data have an analogous relationship to parton distributions as do experimental cross sections, and can be readily included in global analyses. We focus in particular on the constraining capability of current LQCD data on the sign of $\Delta g$ at intermediate parton momentum fractions $x$, which was recently brought into question by analysis of data in the absence of parton positivity constraints. We find that present LQCD data cannot discriminate between positive and negative $\Delta g$ solutions, although significant changes in the solutions for both the gluon and quark sectors are observed. |
hep-ph/9812365 | Gogberashvili Merab Jakob | Merab Gogberashvili (Tbilisi Institute of Physics) | Our World as an Expanding Shell | RevTeX, 4 pages, no figures | Europhys.Lett.49:396-399,2000 | 10.1209/epl/i2000-00162-1 | null | hep-ph gr-qc hep-th | null | In the model where the Universe is considered as a thin shell expanding in
5-dimensional hyper-space there is a possibility to have just one scale for a
particle theory corresponding to the Universe thickness. From a realistic model
the relation of this parameter to the Universe size was found.
| [
{
"created": "Tue, 15 Dec 1998 10:30:26 GMT",
"version": "v1"
}
] | 2010-12-17 | [
[
"Gogberashvili",
"Merab",
"",
"Tbilisi Institute of Physics"
]
] | In the model where the Universe is considered as a thin shell expanding in 5-dimensional hyper-space there is a possibility to have just one scale for a particle theory corresponding to the Universe thickness. From a realistic model the relation of this parameter to the Universe size was found. |
1705.05106 | Fayyazuddin Fayyazuddin | Fayyazuddin and M. Jamil Aslam | Hadronic Weak Decay $\mathcal{B}_{b}(\frac{1}{2}^+) \to
\mathcal{B}(\frac{1}{2}^{+},\; \frac{3}{2}^{+}) +V$ | 10 pages, no figure, A version accepted for publication in Phys. Rev.
D | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that for the effective Lagrangian with factorization ansatz
considered here, the two body hadronic decay $\mathcal{B}_{b}(\frac{1}{2}^+)
\to \mathcal{B}(\frac{1}{2}^{+},\; \frac{3}{2}^{+}) + V$, for
$\mathcal{B}_{b}(\frac{1}{2}^{+})$ belonging to the representation $\bar{3}$,
only allowed decay channel is $\mathcal{B}_{b}(\frac{1}{2}^+) \to
\mathcal{B}(\frac{1}{2}^{+})+ V$, where $\mathcal{B}(\frac{1}{2}^{+})$ belongs
to the representation $8$ of $SU(3)$. However, for
$\mathcal{B}_{b}(\frac{1}{2}^{+})$ belonging to the sextet representation $6$,
the allowed decay channels are $\mathcal{B}_{b}(\frac{1}{2}^+) \to
\mathcal{B}(\frac{1}{2}^{+},\; \frac{3}{2}^{+}) + V$, where
$\mathcal{B}(\frac{1}{2}^{+})$ and $\mathcal{B}(\frac{3}{2}^{+})$ belongs to
the octet representation $8^{\prime}$ and the decuplet $10$ of $SU(3)$,
respectively. The decay channel $\mathcal{B}_{b}(\frac{1}{2}^+) \to
\mathcal{B}(\frac{1}{2}^{+}) + V$ is analyzed in detail. The decay rate
($\Gamma$) and the asymmetry parameters $\alpha\;, \alpha^{\prime}\;, \beta\;,
\gamma$ and $\gamma^{\prime}$ are expressed in terms of four amplitudes. In
particular for the decay $\Lambda_b \to \Lambda + J/\psi$ it is shown that
within the factorization framework, using heavy quark spin symmetry, the decay
rate and the asymmetry parameters can be expressed in terms of two form factors
$F_1$ and $F_{2}/F_{1}$, which are to be evaluated in some model. For other
heavy quarks belonging to the triplet and sextet representation, the results
can be easily obtained by using $SU(3)$ symmetry and phase space factor.
Finally, the decay $\Omega_{b}^{-} \to \Omega^{-} + J/\psi$ is analyzed within
the factorization framework. It is shown that the asymmetry parameter $\alpha$
in this particular decay is zero. The branching ratio obtained in the first
approximation is compared with the experimental value.
| [
{
"created": "Mon, 15 May 2017 08:06:32 GMT",
"version": "v1"
}
] | 2017-05-16 | [
[
"Fayyazuddin",
"",
""
],
[
"Aslam",
"M. Jamil",
""
]
] | It is shown that for the effective Lagrangian with factorization ansatz considered here, the two body hadronic decay $\mathcal{B}_{b}(\frac{1}{2}^+) \to \mathcal{B}(\frac{1}{2}^{+},\; \frac{3}{2}^{+}) + V$, for $\mathcal{B}_{b}(\frac{1}{2}^{+})$ belonging to the representation $\bar{3}$, only allowed decay channel is $\mathcal{B}_{b}(\frac{1}{2}^+) \to \mathcal{B}(\frac{1}{2}^{+})+ V$, where $\mathcal{B}(\frac{1}{2}^{+})$ belongs to the representation $8$ of $SU(3)$. However, for $\mathcal{B}_{b}(\frac{1}{2}^{+})$ belonging to the sextet representation $6$, the allowed decay channels are $\mathcal{B}_{b}(\frac{1}{2}^+) \to \mathcal{B}(\frac{1}{2}^{+},\; \frac{3}{2}^{+}) + V$, where $\mathcal{B}(\frac{1}{2}^{+})$ and $\mathcal{B}(\frac{3}{2}^{+})$ belongs to the octet representation $8^{\prime}$ and the decuplet $10$ of $SU(3)$, respectively. The decay channel $\mathcal{B}_{b}(\frac{1}{2}^+) \to \mathcal{B}(\frac{1}{2}^{+}) + V$ is analyzed in detail. The decay rate ($\Gamma$) and the asymmetry parameters $\alpha\;, \alpha^{\prime}\;, \beta\;, \gamma$ and $\gamma^{\prime}$ are expressed in terms of four amplitudes. In particular for the decay $\Lambda_b \to \Lambda + J/\psi$ it is shown that within the factorization framework, using heavy quark spin symmetry, the decay rate and the asymmetry parameters can be expressed in terms of two form factors $F_1$ and $F_{2}/F_{1}$, which are to be evaluated in some model. For other heavy quarks belonging to the triplet and sextet representation, the results can be easily obtained by using $SU(3)$ symmetry and phase space factor. Finally, the decay $\Omega_{b}^{-} \to \Omega^{-} + J/\psi$ is analyzed within the factorization framework. It is shown that the asymmetry parameter $\alpha$ in this particular decay is zero. The branching ratio obtained in the first approximation is compared with the experimental value. |
2203.09030 | Michael Wagman | L. Alvarez Ruso, A. M. Ankowski, S. Bacca, A. B. Balantekin, J.
Carlson, S. Gardiner, R. Gonzalez-Jimenez, R. Gupta, T. J. Hobbs, M.
Hoferichter, J. Isaacson, N. Jachowicz, W. I. Jay, T. Katori, F. Kling, A. S.
Kronfeld, S. W. Li, H.-W. Lin, K.-F. Liu, A. Lovato, K. Mahn, J. Menendez, A.
S. Meyer, J. Morfin, S. Pastore, N. Rocco, M. Sajjad Athar, T. Sato, A.
Schwenk, P. E. Shanahan, L. E. Strigari, M. Wagman, X. Zhang, Y. Zhao, B.
Acharya, L. Andreoli, C. Andreopoulos, J. L. Barrow, T. Bhattacharya, V.
Brdar, Z. Davoudi, C. Giusti, Y. Hayato, A. N. Khan, D. Kim, Y. F. Li, M.
Lin, P. Machado, M. Martini, K. Niewczas, P. Pandey, A. Papadopoulou, R.
Plestid, M. Roda, I. Ruiz Simo, J. N. Simone, R. S. Sufian, J. Tena-Vidal, O.
Tomalak, Y.-D. Tsai, and J. M. Udias | Theoretical tools for neutrino scattering: interplay between lattice
QCD, EFTs, nuclear physics, phenomenology, and neutrino event generators | 81 pages, contribution to Snowmass 2021 | null | null | DESY-22-05, FERMILAB-FN-1161-T, MITP-22-027 | hep-ph hep-ex hep-lat nucl-th physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Maximizing the discovery potential of increasingly precise neutrino
experiments will require an improved theoretical understanding of
neutrino-nucleus cross sections over a wide range of energies. Low-energy
interactions are needed to reconstruct the energies of astrophysical neutrinos
from supernovae bursts and search for new physics using increasingly precise
measurement of coherent elastic neutrino scattering. Higher-energy interactions
involve a variety of reaction mechanisms including quasi-elastic scattering,
resonance production, and deep inelastic scattering that must all be included
to reliably predict cross sections for energies relevant to DUNE and other
accelerator neutrino experiments. This white paper discusses the theoretical
status, challenges, required resources, and path forward for achieving precise
predictions of neutrino-nucleus scattering and emphasizes the need for a
coordinated theoretical effort involved lattice QCD, nuclear effective
theories, phenomenological models of the transition region, and event
generators.
| [
{
"created": "Thu, 17 Mar 2022 02:08:42 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2022 23:02:40 GMT",
"version": "v2"
}
] | 2022-04-22 | [
[
"Ruso",
"L. Alvarez",
""
],
[
"Ankowski",
"A. M.",
""
],
[
"Bacca",
"S.",
""
],
[
"Balantekin",
"A. B.",
""
],
[
"Carlson",
"J.",
""
],
[
"Gardiner",
"S.",
""
],
[
"Gonzalez-Jimenez",
"R.",
""
],
[
"Gupta",
"R.",
""
],
[
"Hobbs",
"T. J.",
""
],
[
"Hoferichter",
"M.",
""
],
[
"Isaacson",
"J.",
""
],
[
"Jachowicz",
"N.",
""
],
[
"Jay",
"W. I.",
""
],
[
"Katori",
"T.",
""
],
[
"Kling",
"F.",
""
],
[
"Kronfeld",
"A. S.",
""
],
[
"Li",
"S. W.",
""
],
[
"Lin",
"H. -W.",
""
],
[
"Liu",
"K. -F.",
""
],
[
"Lovato",
"A.",
""
],
[
"Mahn",
"K.",
""
],
[
"Menendez",
"J.",
""
],
[
"Meyer",
"A. S.",
""
],
[
"Morfin",
"J.",
""
],
[
"Pastore",
"S.",
""
],
[
"Rocco",
"N.",
""
],
[
"Athar",
"M. Sajjad",
""
],
[
"Sato",
"T.",
""
],
[
"Schwenk",
"A.",
""
],
[
"Shanahan",
"P. E.",
""
],
[
"Strigari",
"L. E.",
""
],
[
"Wagman",
"M.",
""
],
[
"Zhang",
"X.",
""
],
[
"Zhao",
"Y.",
""
],
[
"Acharya",
"B.",
""
],
[
"Andreoli",
"L.",
""
],
[
"Andreopoulos",
"C.",
""
],
[
"Barrow",
"J. L.",
""
],
[
"Bhattacharya",
"T.",
""
],
[
"Brdar",
"V.",
""
],
[
"Davoudi",
"Z.",
""
],
[
"Giusti",
"C.",
""
],
[
"Hayato",
"Y.",
""
],
[
"Khan",
"A. N.",
""
],
[
"Kim",
"D.",
""
],
[
"Li",
"Y. F.",
""
],
[
"Lin",
"M.",
""
],
[
"Machado",
"P.",
""
],
[
"Martini",
"M.",
""
],
[
"Niewczas",
"K.",
""
],
[
"Pandey",
"P.",
""
],
[
"Papadopoulou",
"A.",
""
],
[
"Plestid",
"R.",
""
],
[
"Roda",
"M.",
""
],
[
"Simo",
"I. Ruiz",
""
],
[
"Simone",
"J. N.",
""
],
[
"Sufian",
"R. S.",
""
],
[
"Tena-Vidal",
"J.",
""
],
[
"Tomalak",
"O.",
""
],
[
"Tsai",
"Y. -D.",
""
],
[
"Udias",
"J. M.",
""
]
] | Maximizing the discovery potential of increasingly precise neutrino experiments will require an improved theoretical understanding of neutrino-nucleus cross sections over a wide range of energies. Low-energy interactions are needed to reconstruct the energies of astrophysical neutrinos from supernovae bursts and search for new physics using increasingly precise measurement of coherent elastic neutrino scattering. Higher-energy interactions involve a variety of reaction mechanisms including quasi-elastic scattering, resonance production, and deep inelastic scattering that must all be included to reliably predict cross sections for energies relevant to DUNE and other accelerator neutrino experiments. This white paper discusses the theoretical status, challenges, required resources, and path forward for achieving precise predictions of neutrino-nucleus scattering and emphasizes the need for a coordinated theoretical effort involved lattice QCD, nuclear effective theories, phenomenological models of the transition region, and event generators. |
1005.3196 | James Ferrando | K.Lohwasser, J.Ferrando, C. Issever | On direct measurement of the W production charge asymmetry at the LHC | 18 pages, 10 figures, v2: references and keywords updated v3:
Additional paragraph discussing inclusion of W asymmetry in global fits added | JHEP 1009:079,2010 | 10.1007/JHEP09(2010)079 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The prospects for making a direct measurement of the W production charge
asymmetry at the LHC are discussed. A modification to the method used at the
Tevatron is proposed for measurements at the LHC. The expected sensitivity for
such a measurement to parton distribution functions is compared to that for a
measurement of the lepton charge asymmetry. The direct measurement approach is
found to be less useful for placing constraints on parton distribution
functions at the LHC than a measurement of the lepton charge asymmetry.
| [
{
"created": "Tue, 18 May 2010 13:24:02 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2010 14:33:53 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Aug 2010 19:24:14 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Lohwasser",
"K.",
""
],
[
"Ferrando",
"J.",
""
],
[
"Issever",
"C.",
""
]
] | The prospects for making a direct measurement of the W production charge asymmetry at the LHC are discussed. A modification to the method used at the Tevatron is proposed for measurements at the LHC. The expected sensitivity for such a measurement to parton distribution functions is compared to that for a measurement of the lepton charge asymmetry. The direct measurement approach is found to be less useful for placing constraints on parton distribution functions at the LHC than a measurement of the lepton charge asymmetry. |
2010.13368 | Di-Lun Yang | Koichi Hattori, Yoshimasa Hidaka, Naoki Yamamoto, Di-Lun Yang | Wigner functions and quantum kinetic theory of polarized photons | 25 pages, no figures, minor revisions, journal version in JHEP | null | 10.1007/JHEP02(2021)001 | YITP-20-129, KEK-TH-2262, J-PARC-TH-0228, RIKEN-iTHEMS-Report-20 | hep-ph astro-ph.HE cond-mat.other hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the Wigner functions of polarized photons in the Coulomb gauge with
the $\hbar$ expansion applied to quantum field theory, and identify side-jump
effects for massless photons. We also discuss the photonic chiral vortical
effect for the Chern-Simons current and zilch vortical effect for the zilch
current in local thermal equilibrium as a consistency check for our formalism.
The results are found to be in agreement with those obtained from different
approaches. Moreover, using the real-time formalism, we construct the quantum
kinetic theory (QKT) for polarized photons. By further adopting a specific
power counting scheme for the distribution functions, we provide a more
succinct form of an effective QKT. This photonic QKT involves quantum
corrections associated with self-energy gradients in the collision term, which
are analogous to the side-jump corrections pertinent to spin-orbit interactions
in the chiral kinetic theory for massless fermions. The same theoretical
framework can also be directly applied to weakly coupled gluons in the absence
of background color fields.
| [
{
"created": "Mon, 26 Oct 2020 06:48:24 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2021 08:28:11 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Hattori",
"Koichi",
""
],
[
"Hidaka",
"Yoshimasa",
""
],
[
"Yamamoto",
"Naoki",
""
],
[
"Yang",
"Di-Lun",
""
]
] | We derive the Wigner functions of polarized photons in the Coulomb gauge with the $\hbar$ expansion applied to quantum field theory, and identify side-jump effects for massless photons. We also discuss the photonic chiral vortical effect for the Chern-Simons current and zilch vortical effect for the zilch current in local thermal equilibrium as a consistency check for our formalism. The results are found to be in agreement with those obtained from different approaches. Moreover, using the real-time formalism, we construct the quantum kinetic theory (QKT) for polarized photons. By further adopting a specific power counting scheme for the distribution functions, we provide a more succinct form of an effective QKT. This photonic QKT involves quantum corrections associated with self-energy gradients in the collision term, which are analogous to the side-jump corrections pertinent to spin-orbit interactions in the chiral kinetic theory for massless fermions. The same theoretical framework can also be directly applied to weakly coupled gluons in the absence of background color fields. |
hep-ph/0606226 | Simon Albino | S. Albino, F. Deppisch, R. R\"uckl | Supersymmetric Lepton Flavor Violation and Leptogenesis | 6 pages, 8 figures, presented at the XLIst Rencontres de Moriond,
Electroweak Interactions and Unified Theories, La Thuile, Italy, March 11-18,
2006 | null | null | null | hep-ph | null | We present and discuss constraints on supersymmetric type I seesaw models
imposed by neutrino data, charged lepton flavor violation and thermal
leptogenesis.
| [
{
"created": "Wed, 21 Jun 2006 13:15:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Albino",
"S.",
""
],
[
"Deppisch",
"F.",
""
],
[
"Rückl",
"R.",
""
]
] | We present and discuss constraints on supersymmetric type I seesaw models imposed by neutrino data, charged lepton flavor violation and thermal leptogenesis. |
2307.06704 | Armando Bermudez Martinez | Armando Bermudez Martinez | Transformation of transverse momentum distributions from Parton
Branching to Collins-Soper-Sterman framework | 6 pages, 6 figures | Physics Letters B 845 (2023) 138182 | 10.1016/j.physletb.2023.138182 | CERN-OPEN-2023-016 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Two main frameworks for defining transverse momentum dependent (TMD) parton
densities are the Collins-Soper-Sterman (CSS) formalism, and the Parton
Branching (PB) approach. While PB-TMDs have an explicit dependence on a single
scale which is used to evolve PB-TMDs in momentum space, TMDs defined in CSS
formalism present a double-scale evolution in renormalization and rapidity
scales, via a pair of coupled evolution equations. In this letter I leverage
the Collins-Soper kernel determined from simulated Drell Yan transverse
momentum spectra using PB-TMDs, and provide, for the first time, the
transformation of TMD parton distributions from the PB framework to the CSS
formalism. The evolved PB-TMDs in $b$-space are compared to the recently
released, unpolarized TMD distribution ART23.
| [
{
"created": "Thu, 13 Jul 2023 12:05:11 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2023 15:19:14 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Aug 2023 11:37:35 GMT",
"version": "v3"
}
] | 2023-09-21 | [
[
"Martinez",
"Armando Bermudez",
""
]
] | Two main frameworks for defining transverse momentum dependent (TMD) parton densities are the Collins-Soper-Sterman (CSS) formalism, and the Parton Branching (PB) approach. While PB-TMDs have an explicit dependence on a single scale which is used to evolve PB-TMDs in momentum space, TMDs defined in CSS formalism present a double-scale evolution in renormalization and rapidity scales, via a pair of coupled evolution equations. In this letter I leverage the Collins-Soper kernel determined from simulated Drell Yan transverse momentum spectra using PB-TMDs, and provide, for the first time, the transformation of TMD parton distributions from the PB framework to the CSS formalism. The evolved PB-TMDs in $b$-space are compared to the recently released, unpolarized TMD distribution ART23. |
hep-ph/9805474 | Manuel Drees | Seong-Youl Choi (Yonsei Univ., Seoul) and Manuel Drees (APCTP, Seoul) | CP-Violation through Scalar Tau Oscillation | 11 pages, LaTeX with equation.sty, 3 ps figures (included). Added a
reference and a footnote, and slightly expanded the discussion; version to
appear in Phys. Lett. B | Phys.Lett. B435 (1998) 356-363 | 10.1016/S0370-2693(98)00800-4 | null | hep-ph | null | We point out that oscillation between the two scalar tau (stau) mass
eigenstates can give rise to CP-violation if some parameters appearing in the
stau or chargino/neutralino mass matrices are complex. If stau^+ and stau^-
decay into different charginos or neutralinos, rate asymmetries as large as 20%
are possible. If both staus decay directly into tau + LSP, CP-violation can in
principle still be observed through an energy asymmetry of the tau decay
products, but this asymmetry never exceeds the percent level. Even the rate
asymmetries become small if the mass splitting between the two stau mass
eigenstates is larger than 1%.
| [
{
"created": "Wed, 27 May 1998 06:18:11 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 1998 02:17:13 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Choi",
"Seong-Youl",
"",
"Yonsei Univ., Seoul"
],
[
"Drees",
"Manuel",
"",
"APCTP, Seoul"
]
] | We point out that oscillation between the two scalar tau (stau) mass eigenstates can give rise to CP-violation if some parameters appearing in the stau or chargino/neutralino mass matrices are complex. If stau^+ and stau^- decay into different charginos or neutralinos, rate asymmetries as large as 20% are possible. If both staus decay directly into tau + LSP, CP-violation can in principle still be observed through an energy asymmetry of the tau decay products, but this asymmetry never exceeds the percent level. Even the rate asymmetries become small if the mass splitting between the two stau mass eigenstates is larger than 1%. |
2002.05440 | Johannes Braathen | Johannes Braathen and Shinya Kanemura | Two-loop corrections to the Higgs trilinear coupling in models with
extended scalar sectors | Talk presented at the International Workshop on Future Linear
Colliders (LCWS2019), Sendai, Japan, 28 October-1 November, 2019. C19-10-28.
10 pages, 2 figures | null | null | OU-HET-1041 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs trilinear coupling $\lambda_{hhh}$ is of great importance to
understand the structure of the Higgs sector and allows searching for indirect
signs of Beyond-the-Standard-Model (BSM) physics, even if new states are
somehow hidden. In particular, in models with extended Higgs sectors, it is
known that non-decouplings effects in BSM-scalar contributions at one loop can
cause $\lambda_{hhh}$ to deviate significantly from its SM prediction, raising
the question of what happens at two loops. We review here our calculation of
the leading two-loop corrections to $\lambda_{hhh}$ in an aligned scenario of a
Two-Higgs-Doublet Model. We find their typical size to be 10-20% of the
one-loop corrections, meaning that they do not modify significantly the
one-loop non-decoupling effects, but are not entirely negligible either.
| [
{
"created": "Thu, 13 Feb 2020 10:57:34 GMT",
"version": "v1"
}
] | 2020-02-14 | [
[
"Braathen",
"Johannes",
""
],
[
"Kanemura",
"Shinya",
""
]
] | The Higgs trilinear coupling $\lambda_{hhh}$ is of great importance to understand the structure of the Higgs sector and allows searching for indirect signs of Beyond-the-Standard-Model (BSM) physics, even if new states are somehow hidden. In particular, in models with extended Higgs sectors, it is known that non-decouplings effects in BSM-scalar contributions at one loop can cause $\lambda_{hhh}$ to deviate significantly from its SM prediction, raising the question of what happens at two loops. We review here our calculation of the leading two-loop corrections to $\lambda_{hhh}$ in an aligned scenario of a Two-Higgs-Doublet Model. We find their typical size to be 10-20% of the one-loop corrections, meaning that they do not modify significantly the one-loop non-decoupling effects, but are not entirely negligible either. |
1012.4840 | Andreas Crivellin | Andreas Crivellin | Effective Higgs Vertices in the generic MSSM | 17 pages, 5 figures, references added, figure added, version accepted
for publication in PRD, typos corrected | Phys.Rev.D83:056001,2011 | 10.1103/PhysRevD.83.056001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we consider chirally enhanced corrections to Higgs vertices
in the most general MSSM. We include the contributions stemming from
bilinear-terms, from the trilinear A-terms and their non-holomorphic analogues,
the A'-terms, which couple squarks to the "wrong" Higgs field. We perform a
consistent renormalization of the Higgs vertices beyond the decoupling limit
M_SUSY->infinity, using a purely diagrammatic approach. The cancellation of the
different contributions in and beyond the decoupling limit is discussed and the
possible size of decoupling effects which occur if the SUSY particles are not
much heavier than the electroweak-scale are examined. In the decoupling limit
we recover the results obtained in the effective-field-theory approach. For the
non-holomorphic A'-terms we find the well known $\tan\beta$ enhancement in the
down-sector similar to the one for terms proportional to mu. Due to the a
priori generic flavor structure of these trilinear terms large flavour-changing
neutral Higgs couplings can be induced. We also discover new tan(beta) enhanced
contributions involving the usual holomorphic A-terms, which were not discussed
before in the literature. These corrections occur only if also flavor-diagonal
non-holomorphic corrections to the Higgs couplings are present. This reflects
the fact that the A-terms, and also the chirality-changing self-energies, are
physical quantities and cannot be absorbed into renormalization constants.
| [
{
"created": "Tue, 21 Dec 2010 23:04:20 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2011 17:16:27 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Mar 2011 23:26:15 GMT",
"version": "v3"
},
{
"created": "Tue, 12 Jun 2012 20:13:49 GMT",
"version": "v4"
}
] | 2015-03-17 | [
[
"Crivellin",
"Andreas",
""
]
] | In this article we consider chirally enhanced corrections to Higgs vertices in the most general MSSM. We include the contributions stemming from bilinear-terms, from the trilinear A-terms and their non-holomorphic analogues, the A'-terms, which couple squarks to the "wrong" Higgs field. We perform a consistent renormalization of the Higgs vertices beyond the decoupling limit M_SUSY->infinity, using a purely diagrammatic approach. The cancellation of the different contributions in and beyond the decoupling limit is discussed and the possible size of decoupling effects which occur if the SUSY particles are not much heavier than the electroweak-scale are examined. In the decoupling limit we recover the results obtained in the effective-field-theory approach. For the non-holomorphic A'-terms we find the well known $\tan\beta$ enhancement in the down-sector similar to the one for terms proportional to mu. Due to the a priori generic flavor structure of these trilinear terms large flavour-changing neutral Higgs couplings can be induced. We also discover new tan(beta) enhanced contributions involving the usual holomorphic A-terms, which were not discussed before in the literature. These corrections occur only if also flavor-diagonal non-holomorphic corrections to the Higgs couplings are present. This reflects the fact that the A-terms, and also the chirality-changing self-energies, are physical quantities and cannot be absorbed into renormalization constants. |
2007.04085 | John Collins | John Collins | A new and complete proof of the Landau condition for pinch singularities
of Feynman graphs and other integrals | 39 pages, 10 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Landau equations give a physically useful criterion for how singularities
arise in Feynman amplitudes. Furthermore, they are fundamental to the uses of
perturbative QCD, by determining the important regions of momentum space in
asymptotic problems. Generalizations are also useful. We will show that in
existing treatments there are significant gaps in derivations, and in some
cases implicit assumptions that will be shown here to be false in important
cases like the massless Feynman graphs ubiquitous in QCD applications. In this
paper is given a new proof that the Landau condition is both necessary and
sufficient for physical-region pinches in the kinds of integral typified by
Feynman graphs. The proof's range is broad enough to include the modified
Feynman graphs that are used in QCD applications. Unlike many existing
derivations, there is no need to use the Feynman parameter method. Some
possible further applications of the new proof and its subsidiary results are
proposed.
| [
{
"created": "Wed, 8 Jul 2020 17:48:51 GMT",
"version": "v1"
}
] | 2020-07-09 | [
[
"Collins",
"John",
""
]
] | The Landau equations give a physically useful criterion for how singularities arise in Feynman amplitudes. Furthermore, they are fundamental to the uses of perturbative QCD, by determining the important regions of momentum space in asymptotic problems. Generalizations are also useful. We will show that in existing treatments there are significant gaps in derivations, and in some cases implicit assumptions that will be shown here to be false in important cases like the massless Feynman graphs ubiquitous in QCD applications. In this paper is given a new proof that the Landau condition is both necessary and sufficient for physical-region pinches in the kinds of integral typified by Feynman graphs. The proof's range is broad enough to include the modified Feynman graphs that are used in QCD applications. Unlike many existing derivations, there is no need to use the Feynman parameter method. Some possible further applications of the new proof and its subsidiary results are proposed. |
0709.2086 | Dave Dunbar dr | N. E. J. Bjerrum-Bohr, David C. Dunbar and Warren B. Perkins | Analytic Structure of Three-Mass Triangle Coefficients | 22 pages; v3: NMHV n=point expression added. 7 point expression
removed | JHEP0804:038,2008 | 10.1088/1126-6708/2008/04/038 | null | hep-ph | null | ``Three-mass triangles'' are a class of integral functions appearing in
one-loop gauge theory amplitudes. We discuss how the complex analytic
properties and singularity structures of these amplitudes can be combined with
generalised unitarity techniques to produce compact expressions for three-mass
triangle coefficients. We present formulae for the N=1 contributions to the
n-point NMHV amplitude.
| [
{
"created": "Thu, 13 Sep 2007 14:43:16 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Nov 2007 09:19:36 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Mar 2008 09:10:21 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bjerrum-Bohr",
"N. E. J.",
""
],
[
"Dunbar",
"David C.",
""
],
[
"Perkins",
"Warren B.",
""
]
] | ``Three-mass triangles'' are a class of integral functions appearing in one-loop gauge theory amplitudes. We discuss how the complex analytic properties and singularity structures of these amplitudes can be combined with generalised unitarity techniques to produce compact expressions for three-mass triangle coefficients. We present formulae for the N=1 contributions to the n-point NMHV amplitude. |
2402.06416 | Diego Aristizabal | D. Aristizabal Sierra, Valentina De Romeri, Christoph A. Ternes | Reactor neutrino background in third-generation dark matter detectors | 6 pages, 2 tables, 2 figures | null | null | null | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | Third-generation dark matter detectors will be fully sensitive to the boron-8
solar neutrino flux. Because of this, the characterization of such a background
has been the subject of extensive analyses over the last few years. In
contrast, little is known about the impact of reactor neutrinos. In this letter
we report on the implications of such a flux for dark matter direct detection
searches. We consider five potential detector deployment sites envisioned by
the recently established XLZD consortium: SURF, SNOLAB, Kamioka, LNGS and
Boulby. By using public reactor data we construct five reactor clusters --
involving about 100 currently operating commercial nuclear reactors each -- and
determine the net neutrino flux at each detector site. Assuming a xenon-based
detector and a 50 tonne-year exposure, we show that in all cases the neutrino
event rate may be sizable, depending on energy recoil thresholds. Of all
possible detector sites, SURF and LNGS are those with the smallest reactor
neutrino background. On the contrary, SNOLAB and Boulby are subject to the
strongest reactor neutrino fluxes, with Kamioka being subject to a more
moderate background. Our findings demonstrate that reactor neutrino fluxes
should be taken into account in the next round of dark matter searches. We
argue that this background may be particularly relevant for directional
detectors, provided they meet the requirements we have employed in this
analysis.
| [
{
"created": "Fri, 9 Feb 2024 14:03:13 GMT",
"version": "v1"
}
] | 2024-02-12 | [
[
"Sierra",
"D. Aristizabal",
""
],
[
"De Romeri",
"Valentina",
""
],
[
"Ternes",
"Christoph A.",
""
]
] | Third-generation dark matter detectors will be fully sensitive to the boron-8 solar neutrino flux. Because of this, the characterization of such a background has been the subject of extensive analyses over the last few years. In contrast, little is known about the impact of reactor neutrinos. In this letter we report on the implications of such a flux for dark matter direct detection searches. We consider five potential detector deployment sites envisioned by the recently established XLZD consortium: SURF, SNOLAB, Kamioka, LNGS and Boulby. By using public reactor data we construct five reactor clusters -- involving about 100 currently operating commercial nuclear reactors each -- and determine the net neutrino flux at each detector site. Assuming a xenon-based detector and a 50 tonne-year exposure, we show that in all cases the neutrino event rate may be sizable, depending on energy recoil thresholds. Of all possible detector sites, SURF and LNGS are those with the smallest reactor neutrino background. On the contrary, SNOLAB and Boulby are subject to the strongest reactor neutrino fluxes, with Kamioka being subject to a more moderate background. Our findings demonstrate that reactor neutrino fluxes should be taken into account in the next round of dark matter searches. We argue that this background may be particularly relevant for directional detectors, provided they meet the requirements we have employed in this analysis. |
hep-ph/9909284 | Marc Knecht | M. Knecht (CPT, Marseille), H. Neufeld (Univ. Vienna), H.
Rupertsberger (Univ. Vienna) and P. Talavera (Univ. Lund) | Chiral Perturbation Theory with Virtual Photons and Leptons | 22 pages, no figures | Eur.Phys.J.C12:469-478,2000 | 10.1007/s100529900265 | CPT-99/P.3884, UWThPh-1999-51, LU TP 99/17 | hep-ph | null | We construct a low-energy effective field theory which allows the full
treatment of isospin-breaking effects in semileptonic weak interactions. To
this end, we enlarge the particle spectrum of chiral perturbation theory with
virtual photons by including also the light leptons as dynamical degrees of
freedom. Using super-heat-kernel techniques, we determine the additional
one-loop divergences generated by the presence of virtual leptons and give the
full list of associated local counterterms. We illustrate the use of our
effective theory by applying it to the decays pi -> l nu_{l} and K -> l nu_{l}.
| [
{
"created": "Wed, 8 Sep 1999 14:45:41 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Knecht",
"M.",
"",
"CPT, Marseille"
],
[
"Neufeld",
"H.",
"",
"Univ. Vienna"
],
[
"Rupertsberger",
"H.",
"",
"Univ. Vienna"
],
[
"Talavera",
"P.",
"",
"Univ. Lund"
]
] | We construct a low-energy effective field theory which allows the full treatment of isospin-breaking effects in semileptonic weak interactions. To this end, we enlarge the particle spectrum of chiral perturbation theory with virtual photons by including also the light leptons as dynamical degrees of freedom. Using super-heat-kernel techniques, we determine the additional one-loop divergences generated by the presence of virtual leptons and give the full list of associated local counterterms. We illustrate the use of our effective theory by applying it to the decays pi -> l nu_{l} and K -> l nu_{l}. |
2206.06687 | Jose Bordes | Jose Bordes (1), HM Chan (2) and ST Tsou (3) ((1) Departament Fisica
Teorica and IFIC, Centro Mixto CSIC-Universitat de Valencia, Calle Dr.
Moliner 50, E-46100 Burjassot (Valencia), Spain, (2) Rutherford Appleton
Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom, (3) Mathematical
Institute, University of Oxford, Radcliffe Observatory Quarter, Woodstock
Road, Oxford, OX2 6GG, United Kingdom) | Resolving an ambiguity of Higgs couplings in the FSM, greatly improving
thereby the model's predictive range and prospects | Rectified a historical fact: What was said in version 1 to be a wrong
deduction from FSM in an old paper (reference [10] of this version) was in
fact not that, but a result from a older and looser framework R2M2 plus a
further assumption. Title changed | null | 10.1142/S0217751X22501676 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We show that, after resolving what was thought to be an ambiguity in the
Higgs coupling, the FSM gives, apart from two extra terms (i) and (ii) to be
specified below, an effective action in the standard sector which has the same
form as the SM action, the two differing only in the values of the mass and
mixing parameters of quarks and leptons which the SM takes as inputs from
experiment while the FSM obtains as a result of a fit with a few parameters.
Hence, to the accuracy that these two sets of parameters agree in value, and
they do to a good extent as shown in earlier work, the FSM should give the same
result as the SM in all the circumstances wherethe latter has been successfully
applied, except for the noted modifications due to (i) and (ii). If so, it
would be a big step forward for the FSM. The correction terms are: (i) a mixing
between the SM's $\gamma - Z$ with a new vector boson in the hidden sector,
(ii) a mixing between the standard Higgs with a new scalar boson also in the
hidden sector. And these have been shown a few years back to lead to (i$'$) an
enhancement of the $W$ mass over the SM value \cite{zmixed}, and (ii$'$)
effects consistent with the $g - 2$ and some other anomalies, precisely the two
deviations from the SM reported by experiments \cite{Wmassnew,g-2new} recently
much in the news.
| [
{
"created": "Tue, 14 Jun 2022 08:41:25 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2022 10:49:45 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Aug 2022 10:14:59 GMT",
"version": "v3"
}
] | 2022-12-21 | [
[
"Bordes",
"Jose",
""
],
[
"Chan",
"HM",
""
],
[
"Tsou",
"ST",
""
]
] | We show that, after resolving what was thought to be an ambiguity in the Higgs coupling, the FSM gives, apart from two extra terms (i) and (ii) to be specified below, an effective action in the standard sector which has the same form as the SM action, the two differing only in the values of the mass and mixing parameters of quarks and leptons which the SM takes as inputs from experiment while the FSM obtains as a result of a fit with a few parameters. Hence, to the accuracy that these two sets of parameters agree in value, and they do to a good extent as shown in earlier work, the FSM should give the same result as the SM in all the circumstances wherethe latter has been successfully applied, except for the noted modifications due to (i) and (ii). If so, it would be a big step forward for the FSM. The correction terms are: (i) a mixing between the SM's $\gamma - Z$ with a new vector boson in the hidden sector, (ii) a mixing between the standard Higgs with a new scalar boson also in the hidden sector. And these have been shown a few years back to lead to (i$'$) an enhancement of the $W$ mass over the SM value \cite{zmixed}, and (ii$'$) effects consistent with the $g - 2$ and some other anomalies, precisely the two deviations from the SM reported by experiments \cite{Wmassnew,g-2new} recently much in the news. |
1001.0998 | Genaro Toledo | D. Garcia Gudino and G. Toledo Sanchez | Finite width induced modification to the electromagnetic form factors of
spin-1 particles | 11 pages, 1 figure. Extended discussion, main equations rewritten to
exhibit limiting behavior. Results for K* meson added. Accepted for
publication in PRD | Phys.Rev.D81:073006,2010 | 10.1103/PhysRevD.81.073006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusion of the unstable features of a spin-1 particle, without breaking
the electromagnetic gauge invariance, can be properly accomplished by including
higher order contributions as done in the so-called fermion loop scheme (for
the W gauge boson), and the boson loop scheme (for vector mesons). This induces
a non trivial modification to the electromagnetic vertex of the particle, which
must be considered in addition to any other contribution computed as stable
particles. Considering the modified electromagnetic vertex, we obtain general
expressions for the corresponding corrections to the multipoles as a function
of the mass of the particles in the loop. For the W gauge boson no substantial
deviations from the stable case is observed. For the rho and K* mesons the mass
of the particles in the loop makes a significant effect, and can be comparable
with corrections of different nature .
| [
{
"created": "Wed, 6 Jan 2010 22:05:53 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2010 17:34:31 GMT",
"version": "v2"
}
] | 2010-04-22 | [
[
"Gudino",
"D. Garcia",
""
],
[
"Sanchez",
"G. Toledo",
""
]
] | The inclusion of the unstable features of a spin-1 particle, without breaking the electromagnetic gauge invariance, can be properly accomplished by including higher order contributions as done in the so-called fermion loop scheme (for the W gauge boson), and the boson loop scheme (for vector mesons). This induces a non trivial modification to the electromagnetic vertex of the particle, which must be considered in addition to any other contribution computed as stable particles. Considering the modified electromagnetic vertex, we obtain general expressions for the corresponding corrections to the multipoles as a function of the mass of the particles in the loop. For the W gauge boson no substantial deviations from the stable case is observed. For the rho and K* mesons the mass of the particles in the loop makes a significant effect, and can be comparable with corrections of different nature . |
1303.3227 | Umberto D'Alesio | M. Anselmino (1), M. Boglione (1), U. D'Alesio (2,3), E. Leader (4),
S. Melis (5), F. Murgia (3), A. Prokudin (6) ((1) University of Torino and
INFN, Torino, Italy, (2) University of Cagliari, Italy, (3) INFN, Cagliari,
Italy, (4) Imperial College, London, UK, (5) ECT, Trento, Italy, (6) JLab,
Newport News, USA) | On the potential role of the Collins effect in A_N in pp --> pion X | 4 pages, 4 figures, uses cimento.cls. Talk delivered by U. D'Alesio
at the "3rd Workshop on the QCD Structure of the Nucleon" (QCD-N'12), Oct.
22-26, 2012, Bilbao, Spain. Submitted to "Il Nuovo Cimento C" | null | 10.1393/ncc/i2013-11578-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse single spin asymmetries in pp --> pion X processes, while on a
quite firm ground experimentally, are still a much debated phenomenological
issue. We consider them in a transverse momentum dependent factorization
scheme. After revisiting a previous result, we give new estimates of the
Collins contribution by adopting the latest information on the Collins and
transversity functions, as extracted from SIDIS and e+e- data.
| [
{
"created": "Wed, 13 Mar 2013 17:46:53 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Leader",
"E.",
""
],
[
"Melis",
"S.",
""
],
[
"Murgia",
"F.",
""
],
[
"Prokudin",
"A.",
""
]
] | Transverse single spin asymmetries in pp --> pion X processes, while on a quite firm ground experimentally, are still a much debated phenomenological issue. We consider them in a transverse momentum dependent factorization scheme. After revisiting a previous result, we give new estimates of the Collins contribution by adopting the latest information on the Collins and transversity functions, as extracted from SIDIS and e+e- data. |
1108.5694 | Luis Anchordoqui | Luis Alfredo Anchordoqui | U(3)_C \times Sp(1)_L \times U(1)_L \times U(1)_R | Based on talks given at String Phenomenology 2011 (Madison, WI)
http://conferencing.uwex.edu/conferences/stringpheno2011/index.cfm and at
SUSY11 (Fermilab, Batavia, IL)
https://indico.fnal.gov/conferenceDisplay.py?confId=3563 (v2/v3: references
added) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We outline the basic setting of the U(3)_C \times Sp(1)_L \times U(1)_L
\times U(1)_R gauge theory and review the associated phenomenological aspects
related to experimental searches for new physics at hadron colliders.
| [
{
"created": "Mon, 29 Aug 2011 18:30:23 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2011 18:05:10 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Oct 2011 19:52:32 GMT",
"version": "v3"
}
] | 2011-10-21 | [
[
"Anchordoqui",
"Luis Alfredo",
""
]
] | We outline the basic setting of the U(3)_C \times Sp(1)_L \times U(1)_L \times U(1)_R gauge theory and review the associated phenomenological aspects related to experimental searches for new physics at hadron colliders. |
hep-ph/0512303 | Alexei Smirnov Yu | Alexei Yu. Smirnov | Neutrino masses and mixing | 11 pages, latex, iopams.sty, 3 figures. Invited talk given at
TAUP2005, September 10 - 14, 2005, Zaragoza, Spain | J.Phys.Conf.Ser. 39 (2006) 232-242 | 10.1088/1742-6596/39/1/059 | null | hep-ph | null | Status of determination of the neutrino masses and mixing is formulated and
possible uncertainties, especially due to presence of the sterile neutrinos,
are discussed. The data hint an existence of special ``neutrino'' symmetries.
If not accidental these symmetries have profound implications and can
substantially change the unification program. The key issue on the way to
underlying physics is relations between quarks and leptons. The approximate
quark-lepton symmetry or universality can be reconciled with strongly different
patterns of masses and mixings due to nearly singular character of the mass
matrices or screening of the Dirac structures in the double see-saw mechanism.
| [
{
"created": "Thu, 22 Dec 2005 18:28:09 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Smirnov",
"Alexei Yu.",
""
]
] | Status of determination of the neutrino masses and mixing is formulated and possible uncertainties, especially due to presence of the sterile neutrinos, are discussed. The data hint an existence of special ``neutrino'' symmetries. If not accidental these symmetries have profound implications and can substantially change the unification program. The key issue on the way to underlying physics is relations between quarks and leptons. The approximate quark-lepton symmetry or universality can be reconciled with strongly different patterns of masses and mixings due to nearly singular character of the mass matrices or screening of the Dirac structures in the double see-saw mechanism. |
1712.04057 | Niklas Mueller | Niklas Mueller, Raju Venugopalan | World-line formulation of chiral kinetic theory in topological
background gauge fields | talk by Raju Venugopalan at CPOD2017 (Critical Point and Onset of
Deconfinement; 7-11 August, 2017; The Wang Center, Stony Brook University,
Stony Brook, NY) | null | null | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In heavy-ion collisions, an interesting question of phenomenological
relevance is how the chiral imbalance generated at early times persists through
a fluctuating background of sphalerons in addition to other "non-anomalous"
interactions with the QGP. To address this question, we construct a
relativistic chiral kinetic theory using the world-line formulation of quantum
field theory. We outline how Berry's phase arises in this framework, and how
its effects can be clearly distinguished from those arising from the chiral
anomaly. We further outline how this framework can be matched to classical
statistical simulations at early times and to anomalous chiral hydrodynamics at
late times.
| [
{
"created": "Mon, 11 Dec 2017 22:38:36 GMT",
"version": "v1"
}
] | 2017-12-13 | [
[
"Mueller",
"Niklas",
""
],
[
"Venugopalan",
"Raju",
""
]
] | In heavy-ion collisions, an interesting question of phenomenological relevance is how the chiral imbalance generated at early times persists through a fluctuating background of sphalerons in addition to other "non-anomalous" interactions with the QGP. To address this question, we construct a relativistic chiral kinetic theory using the world-line formulation of quantum field theory. We outline how Berry's phase arises in this framework, and how its effects can be clearly distinguished from those arising from the chiral anomaly. We further outline how this framework can be matched to classical statistical simulations at early times and to anomalous chiral hydrodynamics at late times. |
1303.4687 | Carolina Lujan-Peschard | D. Delepine, C. Lujan-Peschard and M. Napsuciale | A Fourth Neutrino and its Consequences on CP Asymmetries | 12 pages, 9 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general analysis of the consequences of including a fourth neutrino in the
standard model matter content, on CP violating observables at neutrino
oscillation experiments, is presented. Neutrino oscillations in vacuum and with
matter effects are studied. For the former we update and generalize previous
studies on CP asymmetries with an additional active neutrino using an updated
fit of the PMNS mixing matrix. We study the values of the new CP violating
phases which maximize the different CP asymmetries in T2K and MINOS-like setups
aiming to elucidate if the new phases yield measurable effects in the most
favorable case. We show that due to a combined effect of kinematics and
unitarity it is possible to obtain an observable asymmetry in the survival
channels without violating CPT. For the MINOS-like setup, we find maximum
asymmetries in vacuum of the order of 2% and 4% for the $\nu_\mu \to \nu_e$ and
$\nu_e \to \nu_\tau$ channels respectively. For the T2K-like setup we obtain
maximum asymmetries of the order of 6% in the survival $\nu_\mu \to \nu_\mu$
channel. Tree level matter effects enhance the former reaching asymmetries of
the order of 10% for the $\nu_\mu \to \nu_e$ and $\nu_e \to \nu_\tau$ channels,
while the $\nu_\mu \to \nu_\mu$ survival channel changes slightly depending on
the mass hierarchy. Box diagrams with the fourth mass eigenstate as a virtual
particle were also considered, the corrections to the scattering amplitude
being negligible.
| [
{
"created": "Tue, 19 Mar 2013 18:18:41 GMT",
"version": "v1"
}
] | 2013-03-20 | [
[
"Delepine",
"D.",
""
],
[
"Lujan-Peschard",
"C.",
""
],
[
"Napsuciale",
"M.",
""
]
] | A general analysis of the consequences of including a fourth neutrino in the standard model matter content, on CP violating observables at neutrino oscillation experiments, is presented. Neutrino oscillations in vacuum and with matter effects are studied. For the former we update and generalize previous studies on CP asymmetries with an additional active neutrino using an updated fit of the PMNS mixing matrix. We study the values of the new CP violating phases which maximize the different CP asymmetries in T2K and MINOS-like setups aiming to elucidate if the new phases yield measurable effects in the most favorable case. We show that due to a combined effect of kinematics and unitarity it is possible to obtain an observable asymmetry in the survival channels without violating CPT. For the MINOS-like setup, we find maximum asymmetries in vacuum of the order of 2% and 4% for the $\nu_\mu \to \nu_e$ and $\nu_e \to \nu_\tau$ channels respectively. For the T2K-like setup we obtain maximum asymmetries of the order of 6% in the survival $\nu_\mu \to \nu_\mu$ channel. Tree level matter effects enhance the former reaching asymmetries of the order of 10% for the $\nu_\mu \to \nu_e$ and $\nu_e \to \nu_\tau$ channels, while the $\nu_\mu \to \nu_\mu$ survival channel changes slightly depending on the mass hierarchy. Box diagrams with the fourth mass eigenstate as a virtual particle were also considered, the corrections to the scattering amplitude being negligible. |
1510.08768 | Akane Oikawa | Tatsuo Kobayashi, Akane Oikawa and Hajime Otsuka | New potentials for string axion inflation | 20 pages, 2 figures, typos corrected | Phys. Rev. D 93, 083508 (2016) | 10.1103/PhysRevD.93.083508 | EPHOU-15-015, WU-HEP-15-21 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new type of axion inflation with complex structure moduli in the
framework of type IIB superstring theory compactified on Calabi-Yau manifold.
The inflaton is identified as the axion for the complex structure moduli whose
potential is originating from instantonic corrections appearing through the
period vector of mirror Calabi-Yau manifold. The axionic shift symmetry is
broken down to the discrete one by the inclusion of instantonic correction and
certain three-from fluxes. Our proposed inflation scenario is compatible with
K\"ahler moduli stabilization. We also study a typical reheating temperature in
the case of complex structure moduli inflation.
| [
{
"created": "Thu, 29 Oct 2015 16:33:31 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2017 14:18:39 GMT",
"version": "v2"
}
] | 2017-05-11 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Oikawa",
"Akane",
""
],
[
"Otsuka",
"Hajime",
""
]
] | We propose a new type of axion inflation with complex structure moduli in the framework of type IIB superstring theory compactified on Calabi-Yau manifold. The inflaton is identified as the axion for the complex structure moduli whose potential is originating from instantonic corrections appearing through the period vector of mirror Calabi-Yau manifold. The axionic shift symmetry is broken down to the discrete one by the inclusion of instantonic correction and certain three-from fluxes. Our proposed inflation scenario is compatible with K\"ahler moduli stabilization. We also study a typical reheating temperature in the case of complex structure moduli inflation. |
hep-ph/9907475 | Marco Radici | A. Bianconi, S. Boffi, R. Jakob, and M. Radici | Two-hadron interference fragmentation functions. Part I: general
framework | RevTeX, 7 figures, first part of a work split in two, second part
forthcoming in few days | Phys.Rev. D62 (2000) 034008 | 10.1103/PhysRevD.62.034008 | null | hep-ph | null | We investigate the properties of interference fragmentation functions
measurable from the distribution of two hadrons produced in the same jet in the
current fragmentation region of a hard process. We discuss the azimuthal
angular dependences in the leading order cross section of two-hadron inclusive
lepton-nucleon scattering as an example how these interference fragmentation
functions can be addressed separately.
| [
{
"created": "Fri, 23 Jul 1999 14:36:17 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bianconi",
"A.",
""
],
[
"Boffi",
"S.",
""
],
[
"Jakob",
"R.",
""
],
[
"Radici",
"M.",
""
]
] | We investigate the properties of interference fragmentation functions measurable from the distribution of two hadrons produced in the same jet in the current fragmentation region of a hard process. We discuss the azimuthal angular dependences in the leading order cross section of two-hadron inclusive lepton-nucleon scattering as an example how these interference fragmentation functions can be addressed separately. |
hep-ph/9807354 | Andre Likhoded | V.V. Kiselev, A.K. Likhoded, A.I. Onishchenko | Lifetimes of doubly charmed baryons: $\Xi_{cc}^{+}$ and $\Xi_{cc}^{++}$ | 15 pages, Latex file, 3eps figes | Phys.Rev. D60 (1999) 014007 | 10.1103/PhysRevD.60.014007 | DESY-98-079 | hep-ph | null | We have performed a detailed investigation of total lifetimes for the
$\Xi_{cc}^{++}$ and $\Xi_{cc}^{+}$ baryons in the framework of operator product
expansion over the inverse mass of charmed quark, whereas, to estimate matrix
elements of operators obtained in OPE, some approximations of nonrelativistic
QCD are used. This approach allows one to take into account the corrections to
the spectator decays of $c$-quarks, which reflect the fact, that these quarks
are bound, as well as the contributions, connected to the effects of both the
Pauli interference for the $\Xi_{cc}^{++}$-baryon and the weak scattering for
the $\Xi_{cc}^{+}$-baryon. The realization of such program leads to the
following estimates for the total lifetimes of doubly charmed baryons:
$\tau_{\Xi_{cc}^{++}}=0.43\pm 0.1~ps$ and $\tau_{\Xi_{cc}^{+}}=0.11\pm
0.01~ps$.
| [
{
"created": "Mon, 13 Jul 1998 17:00:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kiselev",
"V. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Onishchenko",
"A. I.",
""
]
] | We have performed a detailed investigation of total lifetimes for the $\Xi_{cc}^{++}$ and $\Xi_{cc}^{+}$ baryons in the framework of operator product expansion over the inverse mass of charmed quark, whereas, to estimate matrix elements of operators obtained in OPE, some approximations of nonrelativistic QCD are used. This approach allows one to take into account the corrections to the spectator decays of $c$-quarks, which reflect the fact, that these quarks are bound, as well as the contributions, connected to the effects of both the Pauli interference for the $\Xi_{cc}^{++}$-baryon and the weak scattering for the $\Xi_{cc}^{+}$-baryon. The realization of such program leads to the following estimates for the total lifetimes of doubly charmed baryons: $\tau_{\Xi_{cc}^{++}}=0.43\pm 0.1~ps$ and $\tau_{\Xi_{cc}^{+}}=0.11\pm 0.01~ps$. |
hep-ph/9508246 | null | M. Miyama and S. Kumano (Saga Univ. and BNL(until 8/21)) | Numerical solution of $Q^2$ evolution equations in a brute-force method | 48 pages, LATEX, figs. 1-6. Complete postscript file including the
figure is available at
ftp://ftp.cc.saga-u.ac.jp/pub/paper/riko/quantum1/saga-he-81.ps.gz or at
http://www.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.html (We
had a problem in taking a file in WWW, but the problem was fixed recently.)
Email: 94sm10 or kumanos@cc.saga-u.ac.jp | Comput.Phys.Commun.94:185-215,1996 | 10.1016/0010-4655(96)00013-6 | SAGA-HE-81-95 | hep-ph hep-ex nucl-th | null | We investigate numerical solution of $Q^2$ evolution equations for structure
functions in the nucleon and in nuclei.
(Dokshitzer-Gribov-Lipatov-)Altarelli-Parisi and Mueller-Qiu evolution
equations are solved in a brute-force method. Spin-independent
flavor-nonsinglet and singlet equations with next-to-leading-order $\alpha_s$
corrections are studied. Dividing the variables $x$ and $Q^2$ into small steps,
we simply solve the integrodifferential equations. Numerical results indicate
that accuracy is better than 2\% in the region $10^{-4}<x<0.8$ if more than
two-hundred $Q^2$ steps and more than one-thousand $x$ steps are taken. The
numerical solution is discussed in detail, and evolution results are compared
with $Q^2$ dependent data in CDHSW, SLAC, BCDMS, EMC, NMC, Fermilab-E665, ZEUS,
and H1 experiments. We provide a FORTRAN program for Q$^2$ evolution (and
``devolution'') of nonsinglet-quark, singlet-quark, $q_i+\bar q_i$, and gluon
distributions (and corresponding structure functions) in the nucleon and in
nuclei. This is a very useful program for studying spin-independent structure
functions.
| [
{
"created": "Sun, 6 Aug 1995 03:17:56 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Miyama",
"M.",
"",
"Saga Univ. and BNL"
],
[
"Kumano",
"S.",
"",
"Saga Univ. and BNL"
]
] | We investigate numerical solution of $Q^2$ evolution equations for structure functions in the nucleon and in nuclei. (Dokshitzer-Gribov-Lipatov-)Altarelli-Parisi and Mueller-Qiu evolution equations are solved in a brute-force method. Spin-independent flavor-nonsinglet and singlet equations with next-to-leading-order $\alpha_s$ corrections are studied. Dividing the variables $x$ and $Q^2$ into small steps, we simply solve the integrodifferential equations. Numerical results indicate that accuracy is better than 2\% in the region $10^{-4}<x<0.8$ if more than two-hundred $Q^2$ steps and more than one-thousand $x$ steps are taken. The numerical solution is discussed in detail, and evolution results are compared with $Q^2$ dependent data in CDHSW, SLAC, BCDMS, EMC, NMC, Fermilab-E665, ZEUS, and H1 experiments. We provide a FORTRAN program for Q$^2$ evolution (and ``devolution'') of nonsinglet-quark, singlet-quark, $q_i+\bar q_i$, and gluon distributions (and corresponding structure functions) in the nucleon and in nuclei. This is a very useful program for studying spin-independent structure functions. |
hep-ph/9807434 | Ian Balitsky | Ian Balitsky | Factorization for high-energy scattering | 4 pages, Latex, 1 postscript figure, to appear in PRL | Phys.Rev.Lett.81:2024-2027,1998 | 10.1103/PhysRevLett.81.2024 | JLAB-THY-98-19 | hep-ph | null | I demonstrate that the amplitude of the high-energy scattering can be
factorized in a product of two independent functional integrals over "fast" and
"slow" fields which interact by means of Wilson-line operators -- gauge factors
ordered along the straight lines.
| [
{
"created": "Tue, 21 Jul 1998 00:49:48 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Balitsky",
"Ian",
""
]
] | I demonstrate that the amplitude of the high-energy scattering can be factorized in a product of two independent functional integrals over "fast" and "slow" fields which interact by means of Wilson-line operators -- gauge factors ordered along the straight lines. |
hep-ph/9912474 | Johannes Manus | Bastian Bergerhoff, Johannes Manus and Juergen Reingruber | The Thermal Renormalization Group for Fermions, Universality, and the
Chiral Phase-Transition | References added, minor typos corrected | Phys.Rev. D61 (2000) 125005 | 10.1103/PhysRevD.61.125005 | TUM-HEP-364/99 | hep-ph cond-mat nucl-th | null | We formulate the thermal renormalization group, an implementation of the
Wilsonian RG in the real-time (CTP) formulation of finite temperature field
theory, for fermionic fields. Using a model with scalar and fermionic degrees
of freedom which should describe the two-flavor chiral phase-transition, we
discuss the mechanism behind fermion decoupling and universality at second
order transitions. It turns out that an effective mass-like term in the fermion
propagator which is due to thermal fluctuations and does not break chiral
symmetry is necessary for fermion decoupling to work. This situation is in
contrast to the high-temperature limit, where the dominance of scalar over
fermionic degrees of freedom is due to the different behavior of the
distribution functions. The mass-like contribution is the leading thermal
effect in the fermionic sector and is missed if a derivative expansion of the
fermionic propagator is performed. We also discuss results on the
phase-transition of the model considered where we find good agreement with
results from other methods.
| [
{
"created": "Wed, 22 Dec 1999 17:12:45 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jan 2000 15:29:54 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bergerhoff",
"Bastian",
""
],
[
"Manus",
"Johannes",
""
],
[
"Reingruber",
"Juergen",
""
]
] | We formulate the thermal renormalization group, an implementation of the Wilsonian RG in the real-time (CTP) formulation of finite temperature field theory, for fermionic fields. Using a model with scalar and fermionic degrees of freedom which should describe the two-flavor chiral phase-transition, we discuss the mechanism behind fermion decoupling and universality at second order transitions. It turns out that an effective mass-like term in the fermion propagator which is due to thermal fluctuations and does not break chiral symmetry is necessary for fermion decoupling to work. This situation is in contrast to the high-temperature limit, where the dominance of scalar over fermionic degrees of freedom is due to the different behavior of the distribution functions. The mass-like contribution is the leading thermal effect in the fermionic sector and is missed if a derivative expansion of the fermionic propagator is performed. We also discuss results on the phase-transition of the model considered where we find good agreement with results from other methods. |
hep-ph/0601014 | Tomohiro Matsuda | Tomohiro Matsuda | PBH and DM from cosmic necklaces | 4 pages, 2 figures, Talk given at the conference JGRG held at Tokyo
Institute of Technology, Tokyo, Japan, during 28Nov- 02Dec 2005 | null | null | null | hep-ph astro-ph hep-th | null | Cosmic strings in the brane Universe have recently gained a great interest. I
think the most interesting story is that future cosmological observations
distinguish them from the conventional cosmic strings. If the strings are the
higher-dimensional objects that can (at least initially) move along the
compactified space, and finally settle down to (quasi-)degenerated vacua in the
compactified space, then kinks should appear on the strings, which interpolate
between the degenerated vacua. These kinks look like ``beads'' on the strings,
which means that the strings turn into necklaces. Moreover, in the case that
the compact manifold is not simply connected, the string loop that winds around
a non-trivial circle is stable due to the topological reason. Since the
existence of degenerated vacua and a non-trivial circle is the common feature
of the brane models, it is important to study cosmological constraints on the
cosmic necklaces and their stable winding states in the brane Universe.
| [
{
"created": "Tue, 3 Jan 2006 06:40:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Matsuda",
"Tomohiro",
""
]
] | Cosmic strings in the brane Universe have recently gained a great interest. I think the most interesting story is that future cosmological observations distinguish them from the conventional cosmic strings. If the strings are the higher-dimensional objects that can (at least initially) move along the compactified space, and finally settle down to (quasi-)degenerated vacua in the compactified space, then kinks should appear on the strings, which interpolate between the degenerated vacua. These kinks look like ``beads'' on the strings, which means that the strings turn into necklaces. Moreover, in the case that the compact manifold is not simply connected, the string loop that winds around a non-trivial circle is stable due to the topological reason. Since the existence of degenerated vacua and a non-trivial circle is the common feature of the brane models, it is important to study cosmological constraints on the cosmic necklaces and their stable winding states in the brane Universe. |
1110.4761 | Javier L. Albacete | Javier L Albacete | Initial State: Theory Status | 8 pages, 6 figures. Contribution to the proceedings of the XXII
International Conference on Ultrarelativistic Nucleus-Nucleus Collisions,
QM2011. Annecy, France, 22-28 May 2011 | null | 10.1088/0954-3899/38/12/124006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a brief discussion of the different approaches to the study initial
state effects in heavy ion collisions in view of the recent results from Pb+Pb
and p+p collisions at the LHC.
| [
{
"created": "Fri, 21 Oct 2011 11:36:32 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Albacete",
"Javier L",
""
]
] | I present a brief discussion of the different approaches to the study initial state effects in heavy ion collisions in view of the recent results from Pb+Pb and p+p collisions at the LHC. |
1908.02000 | Xun Chen Mr | Xun Chen, Danning Li, Defu Hou and Mei Huang | Quarkyonic phase from quenched dynamical holographic QCD model | 22 pages, 9 figures | null | 10.1007/JHEP03(2020)073 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral and deconfinement phase transitions at finite temperature $T$ and
quark number chemical potential $\mu$ are simultaneously studied in the
quenched dynamical holographic QCD model within the Einstein-Dilaton-Maxwell
framework. By calculating the corresponding order parameters, i.e., the chiral
condensate and Polyakov loop, it is shown that the transition lines of these
two phase transitions are separated in the $T-\mu $ plane. The deconfinement
phase transition is shown to be always of crossover type and the transition
line depends weakly on the baryon number density. Differently, the chiral
transition is of crossover at small baryon number density and it turns to be of
first order at sufficient large baryon number density. A critical endpoint
(CEP), at which the transition becomes second order type, appears in the chiral
transition line. This is the first time to realize the CEP of chiral phase
transition in the $(T, \mu)$ plane using the holographic
EMD(Einstein-Maxwell-Dilaton) model for two flavour case. It is observed that
between these two phase transition lines, there is a region with chiral
symmetry restored and color degrees still confined, which could be considered
as the quarkyonic phase. Qualitatively, this behavior is in consistent with the
result in the Polyakov-loop improved Nambu-Jona-Lasinio (PNJL) model.
| [
{
"created": "Tue, 6 Aug 2019 07:55:37 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 2020 04:59:36 GMT",
"version": "v2"
}
] | 2020-04-22 | [
[
"Chen",
"Xun",
""
],
[
"Li",
"Danning",
""
],
[
"Hou",
"Defu",
""
],
[
"Huang",
"Mei",
""
]
] | Chiral and deconfinement phase transitions at finite temperature $T$ and quark number chemical potential $\mu$ are simultaneously studied in the quenched dynamical holographic QCD model within the Einstein-Dilaton-Maxwell framework. By calculating the corresponding order parameters, i.e., the chiral condensate and Polyakov loop, it is shown that the transition lines of these two phase transitions are separated in the $T-\mu $ plane. The deconfinement phase transition is shown to be always of crossover type and the transition line depends weakly on the baryon number density. Differently, the chiral transition is of crossover at small baryon number density and it turns to be of first order at sufficient large baryon number density. A critical endpoint (CEP), at which the transition becomes second order type, appears in the chiral transition line. This is the first time to realize the CEP of chiral phase transition in the $(T, \mu)$ plane using the holographic EMD(Einstein-Maxwell-Dilaton) model for two flavour case. It is observed that between these two phase transition lines, there is a region with chiral symmetry restored and color degrees still confined, which could be considered as the quarkyonic phase. Qualitatively, this behavior is in consistent with the result in the Polyakov-loop improved Nambu-Jona-Lasinio (PNJL) model. |
1912.04295 | Abhishek Banerjee | Abhishek Banerjee, Dmitry Budker, Joshua Eby, Victor V. Flambaum,
Hyungjin Kim, Oleksii Matsedonskyi, and Gilad Perez | Searching for Earth/Solar Axion Halos | 26 pages, 9 figures. v3: A typo in Figure 3, left panel is fixed | JHEP 09(2020) 004 | 10.1007/JHEP09(2020)004 | null | hep-ph astro-ph.CO physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the sensitivity of the present and near-future axion dark matter
experiments to a halo of axions or axion-like particles gravitationally bound
to the Earth or the Sun. The existence of such halos, assuming they are formed,
renders a significant gain in the sensitivity of axion searches while
satisfying all the present experimental bounds. The structure and coherence
properties of these halos also imply novel signals, which can depend on the
latitude or orientation of the detector. We demonstrate this by analysing the
sensitivity of several distinct types of axion dark matter experiments.
| [
{
"created": "Mon, 9 Dec 2019 19:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2020 14:23:00 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jan 2021 12:26:59 GMT",
"version": "v3"
}
] | 2021-01-28 | [
[
"Banerjee",
"Abhishek",
""
],
[
"Budker",
"Dmitry",
""
],
[
"Eby",
"Joshua",
""
],
[
"Flambaum",
"Victor V.",
""
],
[
"Kim",
"Hyungjin",
""
],
[
"Matsedonskyi",
"Oleksii",
""
],
[
"Perez",
"Gilad",
""
]
] | We discuss the sensitivity of the present and near-future axion dark matter experiments to a halo of axions or axion-like particles gravitationally bound to the Earth or the Sun. The existence of such halos, assuming they are formed, renders a significant gain in the sensitivity of axion searches while satisfying all the present experimental bounds. The structure and coherence properties of these halos also imply novel signals, which can depend on the latitude or orientation of the detector. We demonstrate this by analysing the sensitivity of several distinct types of axion dark matter experiments. |
2102.11883 | Giancarlo Panizzo | M. Fabbrichesi, R. Floreanini and G. Panizzo | Testing Bell inequalities at the LHC with top-quark pairs | 4 pages, 1 figure | Phys.Rev.Lett. 127 (2021) 16, 161801 | 10.1103/PhysRevLett.127.161801 | null | hep-ph hep-ex quant-ph | http://creativecommons.org/licenses/by/4.0/ | Entanglement between the spins of top-quark pairs produced at a collider can
be used to test a (generalized) Bell inequality at energies never explored so
far. We show how the measurement of a single observable can provide a test of
the violation of the Bell inequality at the 98% CL with the data already
collected at the Large Hadron Collider and at the 99.99% CL with the higher
luminosity of the next run.
| [
{
"created": "Tue, 23 Feb 2021 19:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2021 10:45:41 GMT",
"version": "v2"
}
] | 2021-10-28 | [
[
"Fabbrichesi",
"M.",
""
],
[
"Floreanini",
"R.",
""
],
[
"Panizzo",
"G.",
""
]
] | Entanglement between the spins of top-quark pairs produced at a collider can be used to test a (generalized) Bell inequality at energies never explored so far. We show how the measurement of a single observable can provide a test of the violation of the Bell inequality at the 98% CL with the data already collected at the Large Hadron Collider and at the 99.99% CL with the higher luminosity of the next run. |
2211.11388 | Souad Semlali | S. Moretti, S. Semlali and C. H. Shepherd-Themistocleous | Hunting light Higgses at the LHC in the context of the 2HDM Type-I | Talk presented at the 41st International Conference on High Energy
physics | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We show the reinterpretation of existing searches for exotic decays of the
Standard Model (SM)-like Higgs, $H \to aa (hh)$, in various final states, in
the framework of the 2-Higgs Doublet Model (2HDM) Type-I. We then explore a new
search for such light Higgses, $a$ and $h$, at the Large Hadron Collider (LHC)
Run 3 for an integrated luminosity of 300 $\text{fb}^{-1}$. After performing a
scan over the model parameters, we found that the inverted scenario of Type-I
offers a new promising signal in the form of the following cascade decays: $H
\to Z^{*}a \to Z^{*}Z^{*}h \to b\overline{b} \mu^- \mu^+ jj$. We investigate
then its significance through a full Monte Carlo (MC) simulation down to the
detector level.
| [
{
"created": "Mon, 21 Nov 2022 11:59:07 GMT",
"version": "v1"
}
] | 2022-11-22 | [
[
"Moretti",
"S.",
""
],
[
"Semlali",
"S.",
""
],
[
"Shepherd-Themistocleous",
"C. H.",
""
]
] | We show the reinterpretation of existing searches for exotic decays of the Standard Model (SM)-like Higgs, $H \to aa (hh)$, in various final states, in the framework of the 2-Higgs Doublet Model (2HDM) Type-I. We then explore a new search for such light Higgses, $a$ and $h$, at the Large Hadron Collider (LHC) Run 3 for an integrated luminosity of 300 $\text{fb}^{-1}$. After performing a scan over the model parameters, we found that the inverted scenario of Type-I offers a new promising signal in the form of the following cascade decays: $H \to Z^{*}a \to Z^{*}Z^{*}h \to b\overline{b} \mu^- \mu^+ jj$. We investigate then its significance through a full Monte Carlo (MC) simulation down to the detector level. |
0910.0412 | Fulvia De Fazio | Fulvia De Fazio | New Charm Spectroscopy: Insights from Theory | LaTeX, 9 pages, 3 figures. Invited talk at "CHARM 2009", May 20-22,
2009, Leimen, Germany | null | null | BARI-TH/615-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss several new observations of mesons with open charm. In particular,
we consider $D_{sJ}(2317)$ and $D_{sJ}(2460)$ and compare their isospin
violating decays into $D^{(*)}_s \pi$ to the radiative decays analysed using
light-cone QCD sum rules. The results support the interpretation of these two
mesons as ordinary $c{\bar s}$ states.
In the case of $D_{sJ}(2860)$ and $D_{sJ}(2710)$ we compute the strong decays
in the heavy quark limit. Comparison of the results with recent measurements of
the BaBar Collaboration leads to identify $D_{sJ}(2710)$ with the first radial
excitation of $D_s^*$, while the identification is still uncertain in the case
of $D_{sJ}(2860)$.
| [
{
"created": "Fri, 2 Oct 2009 14:50:54 GMT",
"version": "v1"
}
] | 2009-10-05 | [
[
"De Fazio",
"Fulvia",
""
]
] | We discuss several new observations of mesons with open charm. In particular, we consider $D_{sJ}(2317)$ and $D_{sJ}(2460)$ and compare their isospin violating decays into $D^{(*)}_s \pi$ to the radiative decays analysed using light-cone QCD sum rules. The results support the interpretation of these two mesons as ordinary $c{\bar s}$ states. In the case of $D_{sJ}(2860)$ and $D_{sJ}(2710)$ we compute the strong decays in the heavy quark limit. Comparison of the results with recent measurements of the BaBar Collaboration leads to identify $D_{sJ}(2710)$ with the first radial excitation of $D_s^*$, while the identification is still uncertain in the case of $D_{sJ}(2860)$. |
1405.6567 | Aurore Courtoy | A. Courtoy | Phenomenology of hadron structure --- why low energy physics matters | 18 pages, 12 figures. Contribution to the Proceedings of the XIV
Mexican Workshop on Particles and Fields held in Oaxaca, 25-29, November,
2013. To be published by the Institute of Physics (IOP) in the Journal of
Conference Series | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The description of the internal structure of hadrons is one of the main goal
of QCD. At moderate energy scales, the hadronic representation succeeds to the
partonic description, rendering challenging the description of the dynamics of
scattering processes and hadronic structure. The information on the hadron
structure is embodied in the long distance contributions which are defined as
Parton Distribution Functions (PDFs). PDFs are a key framework for connecting
the low and high-energy regimes, in that the knowledge on non- perturbative QCD
carries important consequences at the high-energy level. We here review recent
progress in the description of the proton, from complementary approaches such
as fits of PDFs, phenomenological analyses and experimental predictions in view
of the JeffersonLab upgrade and applications for high-energy colliders.
| [
{
"created": "Mon, 26 May 2014 13:23:42 GMT",
"version": "v1"
}
] | 2014-05-27 | [
[
"Courtoy",
"A.",
""
]
] | The description of the internal structure of hadrons is one of the main goal of QCD. At moderate energy scales, the hadronic representation succeeds to the partonic description, rendering challenging the description of the dynamics of scattering processes and hadronic structure. The information on the hadron structure is embodied in the long distance contributions which are defined as Parton Distribution Functions (PDFs). PDFs are a key framework for connecting the low and high-energy regimes, in that the knowledge on non- perturbative QCD carries important consequences at the high-energy level. We here review recent progress in the description of the proton, from complementary approaches such as fits of PDFs, phenomenological analyses and experimental predictions in view of the JeffersonLab upgrade and applications for high-energy colliders. |
1408.4456 | Raoul Malm | Raoul Malm, Matthias Neubert and Christoph Schmell | Higgs Couplings and Phenomenology in a Warped Extra Dimension | 28 pages plus appendix, 9 figures; equation (52) corrected,
references updated | null | 10.1007/JHEP02(2015)008 | MITP/14-049 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comprehensive description of the Higgs-boson couplings to
Standard Model fermions and bosons in Randall-Sundrum (RS) models with a Higgs
sector localized on or near the infra-red brane. The analytic results for all
relevant Higgs couplings including the loop-induced couplings to gluons and
photons are summarized for both the minimal and the custodial RS model. The RS
predictions for all relevant Higgs decays are compared with current LHC data,
which already exclude significant portions of the parameter space. We show that
the latest measurements are sensitive to KK gluon masses up to $20\, \rm{TeV}
\times (y_*/3)$ at $95\%$ confidence level for anarchic 5D Yukawa couplings
bounded from above by $|(Y_f)_{ij}| < y_*$. We also derive the sensitivity
levels attainable in the high-luminosity run of the LHC and at a future linear
collider.
| [
{
"created": "Tue, 19 Aug 2014 20:00:20 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2014 13:31:37 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Malm",
"Raoul",
""
],
[
"Neubert",
"Matthias",
""
],
[
"Schmell",
"Christoph",
""
]
] | We present a comprehensive description of the Higgs-boson couplings to Standard Model fermions and bosons in Randall-Sundrum (RS) models with a Higgs sector localized on or near the infra-red brane. The analytic results for all relevant Higgs couplings including the loop-induced couplings to gluons and photons are summarized for both the minimal and the custodial RS model. The RS predictions for all relevant Higgs decays are compared with current LHC data, which already exclude significant portions of the parameter space. We show that the latest measurements are sensitive to KK gluon masses up to $20\, \rm{TeV} \times (y_*/3)$ at $95\%$ confidence level for anarchic 5D Yukawa couplings bounded from above by $|(Y_f)_{ij}| < y_*$. We also derive the sensitivity levels attainable in the high-luminosity run of the LHC and at a future linear collider. |
2010.07448 | Qingwu Wang | Wen-Hua Cai and Qing-Wu Wang | Exploring the parameter space of quasi-particle model with the strange
quark stars | 12 pages,9 figures and 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of strange quark stars are studied within the quasi-particle
model. Taking into account the chemical equilibrium and charge neutrality, the
EOS of $ (2+1) $-flavor quark matter is obtained. We illustrate the parameter
spaces with constraints from two aspects: the one is based on the astronomical
results of PSR J$ 0740+6620 $ and GW$ 170817 $, and another is based on the
constraints proposed from the theoretical study of compact star that the EOS
must ensure the tidal deformability $ \varLambda_{1.4}=190^{+390}_{-120} $ and
support a maximum mass above $ 1.97~M_{\odot} $. It is found that the both
types of constraints can not restrict the parameter space of quasi-particle
model in a reliable region and thus we conclude that the small compact star
cannot be strange quark star.
| [
{
"created": "Thu, 15 Oct 2020 00:33:03 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2020 05:33:50 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Nov 2020 06:55:03 GMT",
"version": "v3"
}
] | 2020-11-10 | [
[
"Cai",
"Wen-Hua",
""
],
[
"Wang",
"Qing-Wu",
""
]
] | The properties of strange quark stars are studied within the quasi-particle model. Taking into account the chemical equilibrium and charge neutrality, the EOS of $ (2+1) $-flavor quark matter is obtained. We illustrate the parameter spaces with constraints from two aspects: the one is based on the astronomical results of PSR J$ 0740+6620 $ and GW$ 170817 $, and another is based on the constraints proposed from the theoretical study of compact star that the EOS must ensure the tidal deformability $ \varLambda_{1.4}=190^{+390}_{-120} $ and support a maximum mass above $ 1.97~M_{\odot} $. It is found that the both types of constraints can not restrict the parameter space of quasi-particle model in a reliable region and thus we conclude that the small compact star cannot be strange quark star. |
1511.02865 | Gregory Barello | G. Barello, Spencer Chang and Christopher A. Newby | Correlated Signals at the Energy and Intensity Frontiers from Nonabelian
Kinetic Mixing | 5 pages, 2 figures | Phys. Rev. D 94, 055018 (2016) | 10.1103/PhysRevD.94.055018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that when a dark abelian gauge sector and SU$(2)_{L}$ kinetically mix
it necessarily generates a relation between the kinetic mixing strength and the
mass of the mediating particle. Remarkably, this correspondence maps the weak
scale directly to the kinetic mixing strengths being probed by modern
fixed-target experiments and next generation flavor factories. This illuminates
the exciting possibility of correlated discoveries of a new particle at the LHC
and a dark photon at intensity frontier experiments. To motivate the scenario,
we construct a simple model and explore its phenomenology and constraints.
| [
{
"created": "Mon, 9 Nov 2015 21:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Nov 2015 00:04:35 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Aug 2016 17:04:18 GMT",
"version": "v3"
}
] | 2016-09-21 | [
[
"Barello",
"G.",
""
],
[
"Chang",
"Spencer",
""
],
[
"Newby",
"Christopher A.",
""
]
] | We show that when a dark abelian gauge sector and SU$(2)_{L}$ kinetically mix it necessarily generates a relation between the kinetic mixing strength and the mass of the mediating particle. Remarkably, this correspondence maps the weak scale directly to the kinetic mixing strengths being probed by modern fixed-target experiments and next generation flavor factories. This illuminates the exciting possibility of correlated discoveries of a new particle at the LHC and a dark photon at intensity frontier experiments. To motivate the scenario, we construct a simple model and explore its phenomenology and constraints. |
1802.10109 | Antonio Morais | Ant\'onio P. Morais, Roman Pasechnik, Thibault Vieu | Multi-peaked signatures of primordial gravitational waves from
multi-step electroweak phase transition | 7 pages, 3 captioned figures, 1 table; numerical analysis extended,
conclusions unchanged; contributed talk by R. Pasechnik at the EPS-HEP2019,
10-17 July, 2019, Ghent, Belgium | null | null | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first-order electroweak phase transition in the early universe could
occur in multiple steps leading to specific multi-peaked signatures in the
primordial gravitational wave (GW) spectrum. We argue that these signatures are
generic phenomena in multi-scalar extensions of the Standard Model. In a simple
example of such an extension, we have studied the emergence of reoccurring and
nested vacuum bubble configurations and their role in the formation of multiple
peaks in the GW spectrum. The conditions for potential detectability of these
features by the forthcoming generation of interferometers have been studied.
| [
{
"created": "Tue, 27 Feb 2018 19:00:10 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Oct 2019 16:24:22 GMT",
"version": "v2"
}
] | 2019-10-25 | [
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Vieu",
"Thibault",
""
]
] | The first-order electroweak phase transition in the early universe could occur in multiple steps leading to specific multi-peaked signatures in the primordial gravitational wave (GW) spectrum. We argue that these signatures are generic phenomena in multi-scalar extensions of the Standard Model. In a simple example of such an extension, we have studied the emergence of reoccurring and nested vacuum bubble configurations and their role in the formation of multiple peaks in the GW spectrum. The conditions for potential detectability of these features by the forthcoming generation of interferometers have been studied. |
hep-ph/0506199 | Johan Alwall | Johan Alwall | Quark Asymmetries in Nucleons | 4 pages, 5 figures. Talk given at DIS 2005, Madison, USA, April
27-May 1, 2005 | null | 10.1063/1.2122050 | null | hep-ph | null | We have developed a physical model for the non-perturbative x-shape of parton
density functions in the proton, based on Gaussian fluctuations in momenta, and
quantum fluctuations of the proton into meson-baryon pairs. The model describes
the proton structure function and gives a natural explanation of observed quark
asymmetries, such as the difference between the anti-up and anti-down sea quark
distributions and between the up and down valence distributions. We also find
an asymmetry in the momentum distribution of strange and anti-strange quarks in
the nucleon, large enough to reduce the NuTeV anomaly to a level which does not
give a significant indication of physics beyond the standard model.
| [
{
"created": "Tue, 21 Jun 2005 09:12:36 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Alwall",
"Johan",
""
]
] | We have developed a physical model for the non-perturbative x-shape of parton density functions in the proton, based on Gaussian fluctuations in momenta, and quantum fluctuations of the proton into meson-baryon pairs. The model describes the proton structure function and gives a natural explanation of observed quark asymmetries, such as the difference between the anti-up and anti-down sea quark distributions and between the up and down valence distributions. We also find an asymmetry in the momentum distribution of strange and anti-strange quarks in the nucleon, large enough to reduce the NuTeV anomaly to a level which does not give a significant indication of physics beyond the standard model. |
1909.00784 | Darius Jurciukonis | D. Jur\v{c}iukonis, L. Lavoura | Higgs masses and couplings in the general 2HDM with unitarity bounds | Proceedings of the 39th International Conference on High Energy
Physics (ICHEP2018) | PoS ICHEP2018 (2019) 334 | 10.22323/1.340.0334 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the general two Higgs doublet model imposing both the
unitarity conditions and the bounded-from-below conditions. Both types of
conditions restrict the ranges of the parameters of the scalar potential. We
study the model in the Higgs basis, i.e. in the basis for the scalar doublets
where only one doublet has vacuum expectation value. We use the experimental
bounds on the oblique parameter T, to produce scalar particles with masses and
cubic and quartic couplings of the Higgs in agreement with the phenomenology.
The numerical calculations show that the cubic coupling may be up to 1.6 times
larger than in the Standard Model, but it may also be zero or even negative.
The quartic coupling is always positive and may be up to four times larger than
in the Standard Model.
| [
{
"created": "Mon, 2 Sep 2019 16:15:13 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Jurčiukonis",
"D.",
""
],
[
"Lavoura",
"L.",
""
]
] | We investigate the general two Higgs doublet model imposing both the unitarity conditions and the bounded-from-below conditions. Both types of conditions restrict the ranges of the parameters of the scalar potential. We study the model in the Higgs basis, i.e. in the basis for the scalar doublets where only one doublet has vacuum expectation value. We use the experimental bounds on the oblique parameter T, to produce scalar particles with masses and cubic and quartic couplings of the Higgs in agreement with the phenomenology. The numerical calculations show that the cubic coupling may be up to 1.6 times larger than in the Standard Model, but it may also be zero or even negative. The quartic coupling is always positive and may be up to four times larger than in the Standard Model. |
2201.06928 | Rodrigo Picanco Negreiros | Joas Zapata, Rodrigo Negreiros, Thiago Sales, and Prashanth Jaikumar | Thermal Relaxation and Cooling of Quark Stars with a Strangelet Crust | 7 pages, 8 figures | A&A 663, A19 (2022) | 10.1051/0004-6361/202243148 | null | hep-ph astro-ph.HE nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we explore the cooling of isolated quark stars. These
objects are structured of a homogeneous quark matter core and crusted by
matter. To do this, we adopt two kinds of crust: (i) a crust made of purely
nuclear matter following the Baym-Pethick-Sutherland (BPS) equation of state
(EoS) and (ii) a crust made of nuggets of strange quark matter (strangelets).
Both models have the same quark matter core described by the MIT bag model EoS.
Our main purpose is to quantify the effects of a strangelet crust on the
cooling and relaxation times of these strange stars. We also perform a thorough
study of the thermal relaxation of quark stars, in which we have found that
objects with a strangelet crust have a significantly different thermal
relaxation time. Our study also includes the possible effects of color
superconductivity in the quark core.
| [
{
"created": "Wed, 29 Dec 2021 19:59:40 GMT",
"version": "v1"
}
] | 2022-07-06 | [
[
"Zapata",
"Joas",
""
],
[
"Negreiros",
"Rodrigo",
""
],
[
"Sales",
"Thiago",
""
],
[
"Jaikumar",
"Prashanth",
""
]
] | In this article, we explore the cooling of isolated quark stars. These objects are structured of a homogeneous quark matter core and crusted by matter. To do this, we adopt two kinds of crust: (i) a crust made of purely nuclear matter following the Baym-Pethick-Sutherland (BPS) equation of state (EoS) and (ii) a crust made of nuggets of strange quark matter (strangelets). Both models have the same quark matter core described by the MIT bag model EoS. Our main purpose is to quantify the effects of a strangelet crust on the cooling and relaxation times of these strange stars. We also perform a thorough study of the thermal relaxation of quark stars, in which we have found that objects with a strangelet crust have a significantly different thermal relaxation time. Our study also includes the possible effects of color superconductivity in the quark core. |
hep-ph/0612231 | Tobias Hurth | Tobias Hurth (CERN, SLAC) | Rare Decays as a Probe for New Physics | 8 pages, 6 figures, based on an invited review talk given at Beauty
2006, the 11th International Conference on B physics at Hadron Colliders,
September 2006, Oxford (England) | Nucl.Phys.Proc.Suppl.170:185-192,2007 | 10.1016/j.nuclphysbps.2007.05.036 | CERN-PH-TH/2006-267, SLAC-PUB-12267 | hep-ph | null | We discuss the indirect search for new degrees of freedom beyond the standard
model, within flavour physics. In particular, we analyse the minimal flavour
violation hypothesis and its phenomenological implications, especially the
large-tan beta scenario in supersymmetric models, and also compare it with the
constrained minimal flavour violation scenario. Moreover, we briefly discuss
some recent progress in inclusive b to s transitions and present a status
report of the so-called K-pi puzzle.
| [
{
"created": "Tue, 19 Dec 2006 16:18:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hurth",
"Tobias",
"",
"CERN, SLAC"
]
] | We discuss the indirect search for new degrees of freedom beyond the standard model, within flavour physics. In particular, we analyse the minimal flavour violation hypothesis and its phenomenological implications, especially the large-tan beta scenario in supersymmetric models, and also compare it with the constrained minimal flavour violation scenario. Moreover, we briefly discuss some recent progress in inclusive b to s transitions and present a status report of the so-called K-pi puzzle. |
hep-ph/9908359 | Dipanwita Dutta | D. Dutta, A. K. Mohanty, K. Kumar and R. K. Choudhury (Nuclear Physics
Division, Bhabha Atomic Research Centre, India) | Dissipative phenomena in chemically non-equilibrated quark gluon plasma | Latex, 20 pages, 4 postscript figures. Submitted in Phys. Rev. C | Phys.Rev.C61:034902,2000 | 10.1103/PhysRevC.61.034902 | null | hep-ph | null | The dissipative corrections to the hydrodynamic equations describing the
evolution of energy-momentum tensor and parton densities are derived in a
simple way using the scaling approximation for the expanding quark gluon plasma
at finite baryon density. This procedure has been extended to study the process
of chemical equilibration using a set of rate equations appropriate for a
viscous quark gluon plasma. It is found that in the presence of dissipation,
the temperature of the plasma evolves slower, whereas the quark and gluon
fugacities evolve faster than their counterparts in the ideal case without
viscosity.
| [
{
"created": "Sat, 14 Aug 1999 06:08:31 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Dutta",
"D.",
"",
"Nuclear Physics\n Division, Bhabha Atomic Research Centre, India"
],
[
"Mohanty",
"A. K.",
"",
"Nuclear Physics\n Division, Bhabha Atomic Research Centre, India"
],
[
"Kumar",
"K.",
"",
"Nuclear Physics\n Division, Bhabha Atomic Research Centre, India"
],
[
"Choudhury",
"R. K.",
"",
"Nuclear Physics\n Division, Bhabha Atomic Research Centre, India"
]
] | The dissipative corrections to the hydrodynamic equations describing the evolution of energy-momentum tensor and parton densities are derived in a simple way using the scaling approximation for the expanding quark gluon plasma at finite baryon density. This procedure has been extended to study the process of chemical equilibration using a set of rate equations appropriate for a viscous quark gluon plasma. It is found that in the presence of dissipation, the temperature of the plasma evolves slower, whereas the quark and gluon fugacities evolve faster than their counterparts in the ideal case without viscosity. |
2105.00081 | Kazem Azizi | S. S. Agaev, K. Azizi, H. Sundu | Doubly charged vector tetraquark
$Z_{\mathrm{V}}^{++}=[cu][\overline{s}\overline{d}]$ | 11 Pages, 2 Figures and 1 Table | null | null | null | hep-ph hep-ex hep-lat | http://creativecommons.org/licenses/by/4.0/ | We explore properties of the doubly charged vector tetraquark $Z_{\mathrm{V}
}^{++}=[cu][\overline{s}\overline{d}]$ built of four quarks of different
flavors using the QCD sum rule methods. The mass and current coupling of $Z_{
\mathrm{V}}^{++}$ are computed in the framework of the QCD two-point sum rule
approach by taking into account quark, gluon and mixed vacuum condensates up to
dimension $10$. The full width of this tetraquark is saturated by $S$-wave
$Z_{\mathrm{V}}^{++} \to \pi ^{+}D_{s1}(2460)^{+},\ \rho^{+}D_{s0}^{\ast
}(2317)^{+}$, and $P$-wave $Z_{\mathrm{V}}^{++} \to \pi ^{+}D_{s}^{+},\
K^{+}D^{+}$ decays. Strong couplings required to find partial widths of
aforementioned decays are calculated in the context of the QCD light-cone sum
rule method and a soft-meson approximation. Our predictions for the mass
$m=(3515 \pm 125)~\mathrm{MeV}$ and full width $ \Gamma
_{\mathrm{full}}=156_{-30}^{+56}~\mathrm{MeV}$ of $Z_{\mathrm{V} }^{++} $ are
useful to search for this exotic meson in various processes. Recently, the LHCb
collaboration discovered neutral states $X_{0(1)}(2900)$ as resonance-like
peaks in $D^{-}K^{+}$ invariant mass distribution in the decay $B^{+} \to
D^{+}D^{-}K^{+}$. We argue that mass distribution of $ D^{+}K^{+}$ mesons in
the same $B$ decay can be used to observe the doubly charged scalar
$Z_{\mathrm{S}}^{++}$ and vector $Z_{\mathrm{V}}^{++}$ tetraquarks.
| [
{
"created": "Fri, 30 Apr 2021 20:41:53 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2021 06:04:05 GMT",
"version": "v2"
}
] | 2021-07-20 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] | We explore properties of the doubly charged vector tetraquark $Z_{\mathrm{V} }^{++}=[cu][\overline{s}\overline{d}]$ built of four quarks of different flavors using the QCD sum rule methods. The mass and current coupling of $Z_{ \mathrm{V}}^{++}$ are computed in the framework of the QCD two-point sum rule approach by taking into account quark, gluon and mixed vacuum condensates up to dimension $10$. The full width of this tetraquark is saturated by $S$-wave $Z_{\mathrm{V}}^{++} \to \pi ^{+}D_{s1}(2460)^{+},\ \rho^{+}D_{s0}^{\ast }(2317)^{+}$, and $P$-wave $Z_{\mathrm{V}}^{++} \to \pi ^{+}D_{s}^{+},\ K^{+}D^{+}$ decays. Strong couplings required to find partial widths of aforementioned decays are calculated in the context of the QCD light-cone sum rule method and a soft-meson approximation. Our predictions for the mass $m=(3515 \pm 125)~\mathrm{MeV}$ and full width $ \Gamma _{\mathrm{full}}=156_{-30}^{+56}~\mathrm{MeV}$ of $Z_{\mathrm{V} }^{++} $ are useful to search for this exotic meson in various processes. Recently, the LHCb collaboration discovered neutral states $X_{0(1)}(2900)$ as resonance-like peaks in $D^{-}K^{+}$ invariant mass distribution in the decay $B^{+} \to D^{+}D^{-}K^{+}$. We argue that mass distribution of $ D^{+}K^{+}$ mesons in the same $B$ decay can be used to observe the doubly charged scalar $Z_{\mathrm{S}}^{++}$ and vector $Z_{\mathrm{V}}^{++}$ tetraquarks. |
hep-ph/9606446 | Haim Goldberg | Haim Goldberg, Mario Gomez (Northeastern University) | How Georgi-Jarlskog and SUSY-SO(10) imply a measurable rate for mu->e
gamma | 4 pages, LaTex, uses espcrc2.sty and axodraw.sty (both attached),
epsfig.sty. Talk given (by HG) at SUSY-96 Conference on Supersymmetry,
University of Maryland, to be published in Proceedings of the conference | Nucl.Phys.Proc.Suppl. 52A (1997) 163-166 | 10.1016/S0920-5632(96)00554-3 | NUB-3133/96-Th | hep-ph | null | Slepton mass matrices have been analyzed in an SO(10) SUSY-GUT, with
soft-breaking terms generated at Planck scale. Higher dimensional operators
consistent with 4-d string constructions are used in order to generate a
Georgi-Jarlskog (G-J) Yukawa texture at \mgut. Radiative corrections between
\mpl\ and \mgut\ generate a substantial non-universality in the
$\tilde\mu-\tilde e$ sector. This non-universality originates in the flavor
dependence of the Higgs assignments required for the G-J texture, and is
unrelated to the large top Yukawa. The resulting branching ratio for mu->e
could make this process observable for large sectors of the MSSM parameter
space, with a factor of 10 improvement in statistics.
| [
{
"created": "Wed, 26 Jun 1996 18:11:08 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Goldberg",
"Haim",
"",
"Northeastern University"
],
[
"Gomez",
"Mario",
"",
"Northeastern University"
]
] | Slepton mass matrices have been analyzed in an SO(10) SUSY-GUT, with soft-breaking terms generated at Planck scale. Higher dimensional operators consistent with 4-d string constructions are used in order to generate a Georgi-Jarlskog (G-J) Yukawa texture at \mgut. Radiative corrections between \mpl\ and \mgut\ generate a substantial non-universality in the $\tilde\mu-\tilde e$ sector. This non-universality originates in the flavor dependence of the Higgs assignments required for the G-J texture, and is unrelated to the large top Yukawa. The resulting branching ratio for mu->e could make this process observable for large sectors of the MSSM parameter space, with a factor of 10 improvement in statistics. |
hep-ph/0111047 | Jose Santiago | F. del Aguila and J. Santiago | Signals from extra dimensions decoupled from the compactification scale | 18 pages, 7 figs; v2 reference and comments added to match the
published version. A discussion of the limits from precision electroweak data
is included. Conclusions are unchanged | JHEP0203:010,2002 | 10.1088/1126-6708/2002/03/010 | UG-FT-133/01 and CAFPE-3/01 | hep-ph hep-ex hep-th | null | Multilocalization provides a simple way of decoupling the mass scale of new
physics from the compactification scale of extra dimensions. It naturally
appears, for example, when localization of fermion zero modes is used to
explain the observed fermion spectrum, leaving low energy remnants of the
geometrical origin of the fermion mass hierarchy. We study the phenomenology of
the simplest five dimensional model with order one Yukawa couplings reproducing
the standard fermion masses and mixing angles and with a light Kaluza-Klein
quark Q_{2/3} saturating experimental limits on V_{tb} and m_Q, and then with
observable new effects at Tevatron.
| [
{
"created": "Tue, 6 Nov 2001 14:42:57 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2002 17:23:06 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"del Aguila",
"F.",
""
],
[
"Santiago",
"J.",
""
]
] | Multilocalization provides a simple way of decoupling the mass scale of new physics from the compactification scale of extra dimensions. It naturally appears, for example, when localization of fermion zero modes is used to explain the observed fermion spectrum, leaving low energy remnants of the geometrical origin of the fermion mass hierarchy. We study the phenomenology of the simplest five dimensional model with order one Yukawa couplings reproducing the standard fermion masses and mixing angles and with a light Kaluza-Klein quark Q_{2/3} saturating experimental limits on V_{tb} and m_Q, and then with observable new effects at Tevatron. |
hep-ph/9507212 | Goswami Srubabati | Srubabati Goswami | Accelerator, reactor, solar and atmospheric neutrino oscillation: beyond
three generations | Latex, 26 pages, 6 figures, 1 included in the Latex File, remaining 5
available on request | Phys.Rev.D55:2931-2949,1997 | 10.1103/PhysRevD.55.2931 | CUPP-95/4 | hep-ph | null | We perform a phenomenological analysis of neutrino oscillation in a four
generation framework introducing an additional sterile neutrino. In such a
scenario, more than one pattern is possible that can accommodate three
hieararchically different mass squared differences as required by the present
experiments. We considered two different spectrums. Choosing the
${\Delta{m}}^2$s in the ranges suitable for the LSND, atmospheric and solar
neutrino oscillation, limits on the mixing angles are derived, consistent with
the most restrictive accelerator and reactor data as well as the atmospheric
and solar neutrino results. The allowed mixing angles are found to be
constrained very severely in both cases. For one mass pattern in the combined
allowed zone the atmospheric anomaly can be explained by $\nu_e - \nu_{\mu}$
oscillation whereas for the other the $\nu_{\mu} - \nu_{\tau}$ channel is
preferred. The accelerator experiments CHORUS and NOMAD have different
sensitivities in these regions and they can distinguish between the two
choices.
| [
{
"created": "Mon, 3 Jul 1995 19:39:34 GMT",
"version": "v1"
}
] | 2009-08-07 | [
[
"Goswami",
"Srubabati",
""
]
] | We perform a phenomenological analysis of neutrino oscillation in a four generation framework introducing an additional sterile neutrino. In such a scenario, more than one pattern is possible that can accommodate three hieararchically different mass squared differences as required by the present experiments. We considered two different spectrums. Choosing the ${\Delta{m}}^2$s in the ranges suitable for the LSND, atmospheric and solar neutrino oscillation, limits on the mixing angles are derived, consistent with the most restrictive accelerator and reactor data as well as the atmospheric and solar neutrino results. The allowed mixing angles are found to be constrained very severely in both cases. For one mass pattern in the combined allowed zone the atmospheric anomaly can be explained by $\nu_e - \nu_{\mu}$ oscillation whereas for the other the $\nu_{\mu} - \nu_{\tau}$ channel is preferred. The accelerator experiments CHORUS and NOMAD have different sensitivities in these regions and they can distinguish between the two choices. |
1407.2546 | Fabian Bach | Fabian Bach (DESY Hamburg), Thorsten Ohl (W\"urzburg University) | Anomalous top charged-current contact interactions in single top
production at the LHC | 33 pages, 10 figures. Published version | Phys. Rev. D 90, 074022 (2014) | 10.1103/PhysRevD.90.074022 | DESY 14-185 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an effective theory approach, the full minimal set of leading
contributions to anomalous charged-current top couplings comprises various new
trilinear tbW as well as quartic tbff' interaction vertices, some of which are
related to one another by equations of motion. While much effort in earlier
work has gone into the extraction of the trilinear couplings from single top
measurements, we argue in this article that these structures can be assessed
independently by other observables, while single top production forms a unique
window to the four-fermion sector. An effective theory approach is employed to
infer and classify the minimal set of such couplings from dimension six
operators in the minimal flavor violation scheme. In the phenomenological
analysis, we present a Monte Carlo study at detector level to quantify the
expected performance of the next LHC run to bound as well as distinguish the
various contact couplings. Special attention is directed toward differential
final state distributions including detector effects as a means to optimize the
signal sensitivity as well as the discriminative power with respect to the
possible coupling structures.
| [
{
"created": "Wed, 9 Jul 2014 16:06:44 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Oct 2014 10:14:45 GMT",
"version": "v2"
}
] | 2014-10-22 | [
[
"Bach",
"Fabian",
"",
"DESY Hamburg"
],
[
"Ohl",
"Thorsten",
"",
"Würzburg University"
]
] | In an effective theory approach, the full minimal set of leading contributions to anomalous charged-current top couplings comprises various new trilinear tbW as well as quartic tbff' interaction vertices, some of which are related to one another by equations of motion. While much effort in earlier work has gone into the extraction of the trilinear couplings from single top measurements, we argue in this article that these structures can be assessed independently by other observables, while single top production forms a unique window to the four-fermion sector. An effective theory approach is employed to infer and classify the minimal set of such couplings from dimension six operators in the minimal flavor violation scheme. In the phenomenological analysis, we present a Monte Carlo study at detector level to quantify the expected performance of the next LHC run to bound as well as distinguish the various contact couplings. Special attention is directed toward differential final state distributions including detector effects as a means to optimize the signal sensitivity as well as the discriminative power with respect to the possible coupling structures. |
hep-ph/9707390 | null | G. Camici and M. Ciafaloni (Dipartimento di Fisica, Universita` di
Firenze and INFN, Sezione di Firenze) | Irreducible part of the next-to-leading BFKL kernel | 16 pages, LaTex2e, including 3 eps figures | Phys.Lett. B412 (1997) 396-406; Erratum-ibid. B417 (1998) 390 | 10.1016/S0370-2693(97)01073-3 | null | hep-ph | null | On the basis of previous work by Fadin, Lipatov, and collaborators, and of
our group, we extract the "irreducible" part of the next-to-leading (NL) BFKL
kernel, we compute its (IR finite) eigenvalue function, and we discuss its
implications for small-x structure functions. We find consistent running
coupling effects and sizable NL corrections to the Pomeron intercept and to the
gluon anomalous dimension. The qualitative effect of such corrections is to
smooth out the small-x rise of structure functions at low values of Q2. A more
quantitative analysis will be possible after the extraction of some additional,
energy-scale dependent contributions to the kernel, which are not treated here.
| [
{
"created": "Fri, 18 Jul 1997 09:01:25 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Camici",
"G.",
"",
"Dipartimento di Fisica, Universita` di\n Firenze and INFN, Sezione di Firenze"
],
[
"Ciafaloni",
"M.",
"",
"Dipartimento di Fisica, Universita` di\n Firenze and INFN, Sezione di Firenze"
]
] | On the basis of previous work by Fadin, Lipatov, and collaborators, and of our group, we extract the "irreducible" part of the next-to-leading (NL) BFKL kernel, we compute its (IR finite) eigenvalue function, and we discuss its implications for small-x structure functions. We find consistent running coupling effects and sizable NL corrections to the Pomeron intercept and to the gluon anomalous dimension. The qualitative effect of such corrections is to smooth out the small-x rise of structure functions at low values of Q2. A more quantitative analysis will be possible after the extraction of some additional, energy-scale dependent contributions to the kernel, which are not treated here. |
hep-ph/9307236 | Neil Turok | Paul Graham, Neil Turok, Philip Lubin and Jeff Schuster | A Simple Test for Non-Gaussianity in CMBR Measurements | 18 pages TeX, Figures available by anonymous ftp, PUP-TH-1408 | null | null | null | hep-ph astro-ph | null | We propose a set of statistics $S_q$ for detecting non-gaussianity in CMBR
anisotropy data sets. These statistics are both simple and, according to
calculations over a space of linear combinations of three-point functions,
nearly optimal at detecting certain types of non-gaussian features. We apply
$S_3$ to the UCSB SP91 experiment and find that the mean of the four frequency
channels is by this criterion strongly non-gaussian. Such an observation would
be highly unlikely in a gaussian theory with a small coherence angle, such as
standard ($n=1$, $\Omega_b = .05$, $h = .5$) inflation. We cannot conclude that
the non-gaussianity is cosmological in origin, but if we assume it due instead
to foreground contamination or instrumental effects, and remove the points
which are clearly responsible for the non-gaussian behavior, the rms of the
remaining fluctuations is too small for consistency with standard inflation.
Further data are needed before definitive conclusions may be drawn. Finally, we
generalize the ideas behind this statistic to other types of non-gaussian
behavior that might be detected in other experimental schemes.
| [
{
"created": "Thu, 8 Jul 1993 20:17:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Graham",
"Paul",
""
],
[
"Turok",
"Neil",
""
],
[
"Lubin",
"Philip",
""
],
[
"Schuster",
"Jeff",
""
]
] | We propose a set of statistics $S_q$ for detecting non-gaussianity in CMBR anisotropy data sets. These statistics are both simple and, according to calculations over a space of linear combinations of three-point functions, nearly optimal at detecting certain types of non-gaussian features. We apply $S_3$ to the UCSB SP91 experiment and find that the mean of the four frequency channels is by this criterion strongly non-gaussian. Such an observation would be highly unlikely in a gaussian theory with a small coherence angle, such as standard ($n=1$, $\Omega_b = .05$, $h = .5$) inflation. We cannot conclude that the non-gaussianity is cosmological in origin, but if we assume it due instead to foreground contamination or instrumental effects, and remove the points which are clearly responsible for the non-gaussian behavior, the rms of the remaining fluctuations is too small for consistency with standard inflation. Further data are needed before definitive conclusions may be drawn. Finally, we generalize the ideas behind this statistic to other types of non-gaussian behavior that might be detected in other experimental schemes. |
2204.09916 | Moslem Ahmadvand | M. Ahmadvand | The Higgs boson as a self-similar system: Towards a new solution to the
hierarchy problem | 5 pages, 1 figure; v3: new discussions added | null | null | null | hep-ph hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a new solution to the hierarchy (naturalness) problem, concerning
quantum corrections of the Higgs mass. Assuming the Higgs boson as a system
with a self-similar internal structure, we calculate its two-point function and
find that the quadratic divergence is replaced by a logarithmic one in the mass
corrections. It is shown that the partonic-like distribution follows the
Tsallis statistics and also high energy physics experimental data for the Higgs
transverse momentum distribution can be described by a self-similar statistical
model.
| [
{
"created": "Thu, 21 Apr 2022 07:13:01 GMT",
"version": "v1"
},
{
"created": "Mon, 30 May 2022 18:33:20 GMT",
"version": "v2"
},
{
"created": "Thu, 2 May 2024 07:05:05 GMT",
"version": "v3"
}
] | 2024-05-03 | [
[
"Ahmadvand",
"M.",
""
]
] | We propose a new solution to the hierarchy (naturalness) problem, concerning quantum corrections of the Higgs mass. Assuming the Higgs boson as a system with a self-similar internal structure, we calculate its two-point function and find that the quadratic divergence is replaced by a logarithmic one in the mass corrections. It is shown that the partonic-like distribution follows the Tsallis statistics and also high energy physics experimental data for the Higgs transverse momentum distribution can be described by a self-similar statistical model. |
2201.13449 | Stephan Narison | R. Albuquerque (FAT-UERJ, Rio de Janeiro, Br), S. Narison
(LUPM-CNRS/IN2P3 Montpellier, FR and iHEPMAD, Antananarivo, MG), D.
Rabetiarivony (iHEPMAD, Antananarivo, MG) | Improved XTZ masses and mass ratios from Laplace Sum Rules at NLO | 46 pages, 27 Figures, 10 Tables. Reference corrected | Nuclear Physics, Volume 1023, July 2022, 122451 | 10.1016/j.nuclphysa.2022.122451 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present improved estimates of the couplings, masses and mass ratios of the
Z_Q,X_Q and T_{QQqq} states using QCD Laplace sum rules (LSR), their ratios R
and double ratios DRSR within stability criteria, where the NLO factorized PT
QCD corrections are included which is important for giving a meaning on the
running MS heavy quark mass used in the analysis. We show that combined R and
DRSR can provide more precise results. First, we conclude that the observed
X_c(3872) and Z_c(3900) are tetramoles states (superposition of
quasi-degenerated molecule and a tetraquark states having (almost) the same
coupling to the currents) with the predicted masses: M_{T_{X_c}}=3876(44) MeV
and M_{ T_{Z_c}}=3900(42) MeV. In the 2nd part, we focus on the analysis of the
four-quark nature of different T_{QQqq'} 1^+ and 0^+ states within the 3_c3_c
interpolating currents. The final results are summarized in Table 7. Combined R
and DRSR calibrated to the observed X_c(3872) lead to a precise prediction of
e.g. M_{T_{cc}^{1^+}}=3886(6) MeV. In a similar way, the DRSR for
M_{T_{cc}^{0^+}}/M_{T_{cc}^{1^+}} calibrated to M_{T_{cc}^{1^+}} gives
M_{T_{cc}^{0^+}}= 3883(3) MeV. The SU3 breaking ratios M_{T_{ccss}^{0^+}}/
M_{T_{cc}^{0^+}} lead to the improved mass predictions:
M_{T_{ccss}^{0^+}}=3988(12) MeV. In the 3rd part, the analysis is extended to
the beauty mesons, where we find the tetramole masses : M_{ T_{Z_b}}=10579(99)
MeV and M_{X_b}=10545(131) MeV. We also observe that the T^{1^+,0^+}_{bbqq'}
states are (almost) stable (within the errors) against strong interactions. In
the 4th part, we (critically) review and correct some recent LSR estimates of
the T^{1^+,0^+}_{QQqq'} masses. Our results from LSR+DRSR are confronted with
the ones from some other approaches (lattices and quark models) in Fig. 25.
| [
{
"created": "Mon, 31 Jan 2022 18:58:18 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Apr 2022 10:10:26 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Aug 2023 17:26:30 GMT",
"version": "v3"
}
] | 2023-08-08 | [
[
"Albuquerque",
"R.",
"",
"FAT-UERJ, Rio de Janeiro, Br"
],
[
"Narison",
"S.",
"",
"LUPM-CNRS/IN2P3 Montpellier, FR and iHEPMAD, Antananarivo, MG"
],
[
"Rabetiarivony",
"D.",
"",
"iHEPMAD, Antananarivo, MG"
]
] | We present improved estimates of the couplings, masses and mass ratios of the Z_Q,X_Q and T_{QQqq} states using QCD Laplace sum rules (LSR), their ratios R and double ratios DRSR within stability criteria, where the NLO factorized PT QCD corrections are included which is important for giving a meaning on the running MS heavy quark mass used in the analysis. We show that combined R and DRSR can provide more precise results. First, we conclude that the observed X_c(3872) and Z_c(3900) are tetramoles states (superposition of quasi-degenerated molecule and a tetraquark states having (almost) the same coupling to the currents) with the predicted masses: M_{T_{X_c}}=3876(44) MeV and M_{ T_{Z_c}}=3900(42) MeV. In the 2nd part, we focus on the analysis of the four-quark nature of different T_{QQqq'} 1^+ and 0^+ states within the 3_c3_c interpolating currents. The final results are summarized in Table 7. Combined R and DRSR calibrated to the observed X_c(3872) lead to a precise prediction of e.g. M_{T_{cc}^{1^+}}=3886(6) MeV. In a similar way, the DRSR for M_{T_{cc}^{0^+}}/M_{T_{cc}^{1^+}} calibrated to M_{T_{cc}^{1^+}} gives M_{T_{cc}^{0^+}}= 3883(3) MeV. The SU3 breaking ratios M_{T_{ccss}^{0^+}}/ M_{T_{cc}^{0^+}} lead to the improved mass predictions: M_{T_{ccss}^{0^+}}=3988(12) MeV. In the 3rd part, the analysis is extended to the beauty mesons, where we find the tetramole masses : M_{ T_{Z_b}}=10579(99) MeV and M_{X_b}=10545(131) MeV. We also observe that the T^{1^+,0^+}_{bbqq'} states are (almost) stable (within the errors) against strong interactions. In the 4th part, we (critically) review and correct some recent LSR estimates of the T^{1^+,0^+}_{QQqq'} masses. Our results from LSR+DRSR are confronted with the ones from some other approaches (lattices and quark models) in Fig. 25. |
hep-ph/0205275 | Tetsuya Sugiura | Tetsuya Sugiura | Properties of Three-Body Decay Functions Derived with Time-Like Jet
Calculus beyond Leading Order | 33 pages, PTPTeX.sty, 16 Postscript eps figures; To be published in
Progress of Theoretical Physics | Prog.Theor.Phys. 107 (2002) 1163 | 10.1143/PTP.107.1163 | null | hep-ph | null | Three-body decay functions in time-like parton branching are calculated using
the jet calculus to the next-to-leading logarithmic (NLL) order in perturbative
quantum chromodynamics (QCD). The phase space contributions from each of the
ladder diagrams and interference diagrams are presented. We correct part of the
results for the three-body decay functions calculated previously by two groups.
Employing our new results, the properties of the three-body decay functions in
the regions of soft partons are examined numerically. Furthermore, we examine
the contribution of the three-body decay functions modified by the restriction
resulting from the kinematical boundary of the phase space for two-body decay
in the parton shower model. This restriction leads to some problems for the
parton shower model. For this reason, we propose a new restriction introduced
by the kinematical boundary of the phase space for two-body decay.
| [
{
"created": "Fri, 24 May 2002 10:54:07 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sugiura",
"Tetsuya",
""
]
] | Three-body decay functions in time-like parton branching are calculated using the jet calculus to the next-to-leading logarithmic (NLL) order in perturbative quantum chromodynamics (QCD). The phase space contributions from each of the ladder diagrams and interference diagrams are presented. We correct part of the results for the three-body decay functions calculated previously by two groups. Employing our new results, the properties of the three-body decay functions in the regions of soft partons are examined numerically. Furthermore, we examine the contribution of the three-body decay functions modified by the restriction resulting from the kinematical boundary of the phase space for two-body decay in the parton shower model. This restriction leads to some problems for the parton shower model. For this reason, we propose a new restriction introduced by the kinematical boundary of the phase space for two-body decay. |
0709.2439 | Gino Isidori | Gino Isidori | Soft-photon corrections in multi-body meson decays | 8 pages, 2 figures (v2: minor modifications - published version) | Eur.Phys.J.C53:567-571,2008 | 10.1140/epjc/s10052-007-0487-0 | null | hep-ph | null | The effects due to soft-photon emission (and the related virtual corrections)
in multi-body decays of B, D, and K mesons are analysed. We present analytic
expressions for the universal O(alpha) correction factors which can be applied
to all multi-body decay modes where a tight soft-photon energy cut in the
decaying-particle rest-frame is applied. All-order resummations valid in the
limit of small and large velocities of the final-state particles are also
discussed. The phenomenological implications of these correction factors in the
distortion of Dalitz-plot distributions of K -> 3 pi decays are briefly
analysed.
| [
{
"created": "Sat, 15 Sep 2007 18:08:48 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2007 14:35:07 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Isidori",
"Gino",
""
]
] | The effects due to soft-photon emission (and the related virtual corrections) in multi-body decays of B, D, and K mesons are analysed. We present analytic expressions for the universal O(alpha) correction factors which can be applied to all multi-body decay modes where a tight soft-photon energy cut in the decaying-particle rest-frame is applied. All-order resummations valid in the limit of small and large velocities of the final-state particles are also discussed. The phenomenological implications of these correction factors in the distortion of Dalitz-plot distributions of K -> 3 pi decays are briefly analysed. |
hep-ph/9305281 | Michal Praszalowicz | M. Prasza{\L}OWICZ, A. Blotz and K. Goeke (Ruhr-University Bochum,
Germany) | Hyperons as Solitons in Chiral Quark Model | 8 pages, talk presented at XXVIII Rencontres de Moriond, LaTeX, needs
psifig.tex. Two figures included at the end as uudecoded poscript file | null | null | null | hep-ph | null | The paper describes the quantization of the SU(3) smibosonized
Nambu-Jona-Lasinio model and results for mass splittings, including isospin
splittings, and axial couplings. The agreement with the data is surprisingly
good.
| [
{
"created": "Tue, 18 May 1993 12:13:34 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"PraszaŁOWICZ",
"M.",
"",
"Ruhr-University Bochum,\n Germany"
],
[
"Blotz",
"A.",
"",
"Ruhr-University Bochum,\n Germany"
],
[
"Goeke",
"K.",
"",
"Ruhr-University Bochum,\n Germany"
]
] | The paper describes the quantization of the SU(3) smibosonized Nambu-Jona-Lasinio model and results for mass splittings, including isospin splittings, and axial couplings. The agreement with the data is surprisingly good. |
1704.08330 | Jens Erler | Jens Erler | Precision Electroweak Measurements at Run 2 and Beyond | 10 pages, 6 figures, invited talk presented at the 52nd Rencontres de
Moriond session devoted to Electroweak Interactions and Unified Theories, La
Thuile, Italy, March 18--25, 2017 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After reviewing the key features of the global electroweak fit, I will
provide updated results and offer experimental and theoretical contexts. I will
also make the case for greater precision and highlight future directions.
| [
{
"created": "Wed, 26 Apr 2017 19:57:51 GMT",
"version": "v1"
}
] | 2017-04-28 | [
[
"Erler",
"Jens",
""
]
] | After reviewing the key features of the global electroweak fit, I will provide updated results and offer experimental and theoretical contexts. I will also make the case for greater precision and highlight future directions. |
2202.05191 | Fabian Zierler | Suchita Kulkarni, Axel Maas, Se\'an Mee, Marco Nikolic, Josef Pradler,
Fabian Zierler | Low-energy effective description of dark $Sp(4)$ theories | 60 pages, 12 figures; v2: added section 5.4 on eta' meson in the
non-degenerate case, minor changes, added references | SciPost Phys. 14, 044 (2023) | 10.21468/SciPostPhys.14.3.044 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Strongly interacting massive particles are viable dark matter candidates. We
consider a dark $Sp(4)$ gauge theory with $N_f=2$ fermions in the pseudo-real
fundamental representation and construct the chiral low-energy effective
theory. We determine the flavor multiplet structure and the chiral Lagrangian,
including the Wess-Zumino-Witten term for mass-degenerate and non-degenerate
flavors. We then study the possible charge assignments under a $U(1)'$ gauge
symmetry, emphasizing on dark state stability, and provide the full Lagrangian
description for Goldstone bosons and vector resonances, including the
Wess-Zumino-Witten term. Finally, we use dedicated lattice simulations to
determine the chiral low-energy effective theory's validity and low-energy
constants. This work represents a self-consistent study of this non-Abelian
theory. It thereby provides a framework for future phenomenological exploration
in connection to the dark matter problem.
| [
{
"created": "Thu, 10 Feb 2022 17:49:56 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Sep 2022 12:55:16 GMT",
"version": "v2"
}
] | 2023-03-22 | [
[
"Kulkarni",
"Suchita",
""
],
[
"Maas",
"Axel",
""
],
[
"Mee",
"Seán",
""
],
[
"Nikolic",
"Marco",
""
],
[
"Pradler",
"Josef",
""
],
[
"Zierler",
"Fabian",
""
]
] | Strongly interacting massive particles are viable dark matter candidates. We consider a dark $Sp(4)$ gauge theory with $N_f=2$ fermions in the pseudo-real fundamental representation and construct the chiral low-energy effective theory. We determine the flavor multiplet structure and the chiral Lagrangian, including the Wess-Zumino-Witten term for mass-degenerate and non-degenerate flavors. We then study the possible charge assignments under a $U(1)'$ gauge symmetry, emphasizing on dark state stability, and provide the full Lagrangian description for Goldstone bosons and vector resonances, including the Wess-Zumino-Witten term. Finally, we use dedicated lattice simulations to determine the chiral low-energy effective theory's validity and low-energy constants. This work represents a self-consistent study of this non-Abelian theory. It thereby provides a framework for future phenomenological exploration in connection to the dark matter problem. |
0707.4337 | Vali Bashiry | F. Zolfagharpour, V. Bashiry | Double Lepton Polarization in $\Lambda_b -->\Lambda l^+ l^-$ Decay in
the Standard Model with Fourth Generations Scenario | 36 pages, 33 figures | Nucl.Phys.B796:294-319,2008 | 10.1016/j.nuclphysb.2007.12.022 | null | hep-ph | null | This study investigates the influence of the fourth generation quarks on the
double lepton polarizations in \Lambda_b --> \Lambda \ell^+ \ell^- decay by
taking |V^\ast_{t's}V_{t'b}|= 0.005,0.01,0.02,0.03 with phase
\{60^\circ,90^\circ,120^\circ\}. We will try to obtain a constrain on the mass
of the 4th generation top like quark t', which is consistent with the $b-->
s\ell^+\ell^- rate . With the above mentioned parameters, we will try to show
that the double lepton(muon, tau) polarizations are quite sensitive to the
existence of fourth generation. It can serve as a good tool to search for new
physics effects, precisely, to search for the fourth generation quarks(t', b')
via its indirect manifestations in loop diagrams.
| [
{
"created": "Mon, 30 Jul 2007 05:19:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zolfagharpour",
"F.",
""
],
[
"Bashiry",
"V.",
""
]
] | This study investigates the influence of the fourth generation quarks on the double lepton polarizations in \Lambda_b --> \Lambda \ell^+ \ell^- decay by taking |V^\ast_{t's}V_{t'b}|= 0.005,0.01,0.02,0.03 with phase \{60^\circ,90^\circ,120^\circ\}. We will try to obtain a constrain on the mass of the 4th generation top like quark t', which is consistent with the $b--> s\ell^+\ell^- rate . With the above mentioned parameters, we will try to show that the double lepton(muon, tau) polarizations are quite sensitive to the existence of fourth generation. It can serve as a good tool to search for new physics effects, precisely, to search for the fourth generation quarks(t', b') via its indirect manifestations in loop diagrams. |
2110.11716 | G.R. Boroun | G.R.Boroun | Analytic derivation of the non-linear gluon distribution function | arXiv admin note: text overlap with arXiv:2109.08878 | Eur.Phys.J.Plus 137 (2022) 2, 259 | 10.1140/epjp/s13360-022-02486-0 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the present article, two analytical solutions based on the Laplace
transforms method for the linear and non-linear gluon distribution functions
have been presented at low values of $x$. These linear and non-linear methods
are presented based on the solutions of the Dokshitzer-Gribov-
Lipatov-Altarelli-Parisi (DGLAP) evolution equation and the Gribov-Levin-Ryskin
Mueller-Qiu (GLR-MQ) equation at the leading-order accuracy in perturbative QCD
respectively. The gluon distributions are obtained directly in terms of the
parametrization of structure function $F_{2}(x,Q^{2})$ and its derivative and
compared with the results from the parametrization models. The $n_{f}$ changes
at the threshold are considered in the numerical results. The effects of the
non-linear corrections are visible as $Q^{2}$ decreases and vanish as $Q^{2}$
increases. The nonlinear corrections tame the behavior of the gluon
distribution function at low
$x$ and $Q^{2}$ in comparison with the parametrization models.
| [
{
"created": "Fri, 22 Oct 2021 11:31:11 GMT",
"version": "v1"
}
] | 2022-04-19 | [
[
"Boroun",
"G. R.",
""
]
] | In the present article, two analytical solutions based on the Laplace transforms method for the linear and non-linear gluon distribution functions have been presented at low values of $x$. These linear and non-linear methods are presented based on the solutions of the Dokshitzer-Gribov- Lipatov-Altarelli-Parisi (DGLAP) evolution equation and the Gribov-Levin-Ryskin Mueller-Qiu (GLR-MQ) equation at the leading-order accuracy in perturbative QCD respectively. The gluon distributions are obtained directly in terms of the parametrization of structure function $F_{2}(x,Q^{2})$ and its derivative and compared with the results from the parametrization models. The $n_{f}$ changes at the threshold are considered in the numerical results. The effects of the non-linear corrections are visible as $Q^{2}$ decreases and vanish as $Q^{2}$ increases. The nonlinear corrections tame the behavior of the gluon distribution function at low $x$ and $Q^{2}$ in comparison with the parametrization models. |
1001.0428 | Myriam Mondragon | Sven Heinemeyer, Myriam Mondragon and George Zoupanos | Finite Unification: Theory and Predictions | Presented at 8th International Conference on Symmetry in Nonlinear
Mathematical Physics, Kyiv, Ukraine, June 21-27, 2009; v2: published version | SIGMA 6:049,2010 | 10.3842/SIGMA.2010.049 | CERN-PH-TH/2009-256 | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | All-loop Finite Unified Theories (FUTs) are very interesting N=1
supersymmetric Grand Unified Theories (GUTs) which not only realise an old
field theoretic dream but also have a remarkable predictive power due to the
required reduction of couplings. The reduction of the dimensionless couplings
in N=1 GUTs is achieved by searching for renormalization group invariant (RGI)
relations among them holding beyond the unification scale. Finiteness results
from the fact that there exist RGI relations among dimensionless couplings that
guarantee the vanishing of all beta-functions in certain N=1 GUTs even to all
orders. Furthermore developments in the soft supersymmetry breaking sector of
N=1 GUTs and FUTs lead to exact RGI relations, i.e. reduction of couplings, in
this dimensionful sector of the theory too. Based on the above theoretical
framework phenomenologically consistent FUTS have been constructed. Here we
present FUT models based on the SU(5) and SU(3)^3 gauge groups and their
predictions. Of particular interest is the Higgs mass prediction of one of the
models which is expected to be tested at the LHC.
| [
{
"created": "Mon, 4 Jan 2010 02:49:00 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2010 04:06:26 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Heinemeyer",
"Sven",
""
],
[
"Mondragon",
"Myriam",
""
],
[
"Zoupanos",
"George",
""
]
] | All-loop Finite Unified Theories (FUTs) are very interesting N=1 supersymmetric Grand Unified Theories (GUTs) which not only realise an old field theoretic dream but also have a remarkable predictive power due to the required reduction of couplings. The reduction of the dimensionless couplings in N=1 GUTs is achieved by searching for renormalization group invariant (RGI) relations among them holding beyond the unification scale. Finiteness results from the fact that there exist RGI relations among dimensionless couplings that guarantee the vanishing of all beta-functions in certain N=1 GUTs even to all orders. Furthermore developments in the soft supersymmetry breaking sector of N=1 GUTs and FUTs lead to exact RGI relations, i.e. reduction of couplings, in this dimensionful sector of the theory too. Based on the above theoretical framework phenomenologically consistent FUTS have been constructed. Here we present FUT models based on the SU(5) and SU(3)^3 gauge groups and their predictions. Of particular interest is the Higgs mass prediction of one of the models which is expected to be tested at the LHC. |
hep-ph/9708274 | Maria Krawczyk | Maria Krawczyk, A. Zembrzuski (Institute of Theoretical Physics,
University of Warsaw, Poland) | Probing the Structure of Virtual Photon in the Deep Inelastic Compton
Process at HERA | Latex, 6 pages, 2 ps-figures, Contribution to PHOTON 97 Conference,
Egmond aan Zee, The Netherlands | Phys.Rev.D57:10-12,1998 | 10.1103/PhysRevD.57.10 | IFT 97/7 | hep-ph | null | The sensitivity of the Deep Inelastic Compton (DIC) scattering at HERA to the
structure of the virtual photon is discussed. It is demonstrated that the
gluonic content of the virtual photon can be pinned down by measuring the
photons with $p_T \sim 5 $ GeV in the proton direction.
| [
{
"created": "Thu, 7 Aug 1997 12:06:56 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Krawczyk",
"Maria",
"",
"Institute of Theoretical Physics,\n University of Warsaw, Poland"
],
[
"Zembrzuski",
"A.",
"",
"Institute of Theoretical Physics,\n University of Warsaw, Poland"
]
] | The sensitivity of the Deep Inelastic Compton (DIC) scattering at HERA to the structure of the virtual photon is discussed. It is demonstrated that the gluonic content of the virtual photon can be pinned down by measuring the photons with $p_T \sim 5 $ GeV in the proton direction. |
1103.1973 | Alberto Tonero | U. De Sanctis, M. Fabbrichesi and A. Tonero | Telling the spin of the "Higgs boson" at the LHC | 17 pages, 3 figures | Phys.Rev.D84:015013,2011 | 10.1103/PhysRevD.84.015013 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assume that the Higgs boson or a possible resonance---playing its role in
strongly interacting models of electroweak symmetry breaking---has been
discovered at the LHC and propose a search strategy to determine its spin based
on two simple asymmetries in the ZZ, W+W- and t t-bar decays channels. We
consider some benchmark values for its mass (in the interval from 182 GeV/c^2
to 1 TeV/c^2) and discuss the relative advantages of the different decay
processes. A full analysis, including the background, is given. For a
center-of-mass energy of 14 TeV, we find that the lowest integrated luminosity
required to discriminate between the different spins is, depending on the
process and the resonance mass, between 40 fb^{-1} and 250 fb^{-1}.
| [
{
"created": "Thu, 10 Mar 2011 09:41:11 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"De Sanctis",
"U.",
""
],
[
"Fabbrichesi",
"M.",
""
],
[
"Tonero",
"A.",
""
]
] | We assume that the Higgs boson or a possible resonance---playing its role in strongly interacting models of electroweak symmetry breaking---has been discovered at the LHC and propose a search strategy to determine its spin based on two simple asymmetries in the ZZ, W+W- and t t-bar decays channels. We consider some benchmark values for its mass (in the interval from 182 GeV/c^2 to 1 TeV/c^2) and discuss the relative advantages of the different decay processes. A full analysis, including the background, is given. For a center-of-mass energy of 14 TeV, we find that the lowest integrated luminosity required to discriminate between the different spins is, depending on the process and the resonance mass, between 40 fb^{-1} and 250 fb^{-1}. |
hep-ph/0509253 | Lukasz Bibrzycki | L. Bibrzycki, L. Lesniak, A. P. Szczepaniak | S-P wave interference in the K+K- photoproduction on hydrogen | 9 pages, 8 eps figures, needs appolb.cls, talk given by L. Bibrzycki
at Cracow School of Theoretical Physics, XLV Course, Zakopane, June 7, 2005;
to be published in Acta Physica Polonica B | Acta Phys.Polon. B36 (2005) 3889-3896 | null | null | hep-ph | null | We have studied the partial wave interference effects to obtain a new
information about the contribution of the S-wave to the cross section of the
K+K- photoproduction on hydrogen. The K+K- photoproduction channel for the
effective masses around 1 GeV is dominated by the phi(1020) resonance with only
a small fraction of events coming from decays of scalar resonances f0(980) and
a0(980). However, a careful analysis of angular distributions of the outgoing
kaons shows that the S-wave adds an asymmetry to the angular distribution of
kaons. A fairly precise estimation of the K+K- photoproduction cross section in
the S-wave has been obtained.
| [
{
"created": "Fri, 23 Sep 2005 10:36:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bibrzycki",
"L.",
""
],
[
"Lesniak",
"L.",
""
],
[
"Szczepaniak",
"A. P.",
""
]
] | We have studied the partial wave interference effects to obtain a new information about the contribution of the S-wave to the cross section of the K+K- photoproduction on hydrogen. The K+K- photoproduction channel for the effective masses around 1 GeV is dominated by the phi(1020) resonance with only a small fraction of events coming from decays of scalar resonances f0(980) and a0(980). However, a careful analysis of angular distributions of the outgoing kaons shows that the S-wave adds an asymmetry to the angular distribution of kaons. A fairly precise estimation of the K+K- photoproduction cross section in the S-wave has been obtained. |
0809.3698 | Nikolai Zotov | S.P. Baranov, N.P. Zotov | Upsilonium Polarization as a Touchstone in Understanding the Parton
Dynamics in QCD | 6 pages, 2 figures, to be published in Proceedings of HSQCD Workshop,
Gatchina, 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the $k_T$-factorization approach, the production of
Upsilon mesons at the Fermilab Tevatron is considered, and the comparisions of
calculated $p_T$-distributions and spin alignment parameter $\alpha$ with the
D0 experimental data are shown. We argue that measuring the double cross
section and the polarization of upsilonium states can serve as a crucial test
discriminating two competing theoretical approaches to parton dynamics in QCD.
| [
{
"created": "Mon, 22 Sep 2008 12:57:44 GMT",
"version": "v1"
}
] | 2008-09-23 | [
[
"Baranov",
"S. P.",
""
],
[
"Zotov",
"N. P.",
""
]
] | In the framework of the $k_T$-factorization approach, the production of Upsilon mesons at the Fermilab Tevatron is considered, and the comparisions of calculated $p_T$-distributions and spin alignment parameter $\alpha$ with the D0 experimental data are shown. We argue that measuring the double cross section and the polarization of upsilonium states can serve as a crucial test discriminating two competing theoretical approaches to parton dynamics in QCD. |
2008.11626 | Michael Spira | J. Baglio, F.Campanario, S. Glaus, M. M\"uhlleitner, J. Ronca and M.
Spira | $gg\to HH$: Combined Uncertainties | 8 pages, 2 figures, minor extensions of text, matches published
version | Phys. Rev. D 103, 056002 (2021) | 10.1103/PhysRevD.103.056002 | CERN-TH-2020-139, IFIC/20-42, FTUV-20-0823, KA-TP-11-2020,
PSI-PR-20-13 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we discuss the combination of the usual renormalization and
factorization scale uncertainties of Higgs-pair production via gluon fusion
with the novel uncertainties originating from the scheme and scale choice of
the virtual top mass. Moreover, we address the uncertainties related to the
top-mass definition for different values of the trilinear Higgs coupling and
their combination with the other uncertainties.
| [
{
"created": "Wed, 26 Aug 2020 15:35:38 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2020 12:25:10 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Mar 2021 11:35:34 GMT",
"version": "v3"
}
] | 2021-03-10 | [
[
"Baglio",
"J.",
""
],
[
"Campanario",
"F.",
""
],
[
"Glaus",
"S.",
""
],
[
"Mühlleitner",
"M.",
""
],
[
"Ronca",
"J.",
""
],
[
"Spira",
"M.",
""
]
] | In this note we discuss the combination of the usual renormalization and factorization scale uncertainties of Higgs-pair production via gluon fusion with the novel uncertainties originating from the scheme and scale choice of the virtual top mass. Moreover, we address the uncertainties related to the top-mass definition for different values of the trilinear Higgs coupling and their combination with the other uncertainties. |
0803.0820 | J. Guilherme Milhano | Nestor Armesto, Sergey Bondarenko, Jose Guilherme Milhano and Paloma
Quiroga | Reaction-diffusion processes in zero transverse dimensions as toy models
for high-energy QCD | 17 pages, 7 figures | JHEP 0805:103,2008 | 10.1088/1126-6708/2008/05/103 | null | hep-ph cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine numerically different zero-dimensional reaction-diffusion
processes as candidate toy models for high-energy QCD evolution. Of the models
examined -- Reggeon Field Theory, Directed Percolation and Reversible Processes
-- only the latter shows the behaviour commonly expected, namely an increase of
the scattering amplitude with increasing rapidity. Further, we find that
increasing recombination terms, quantum loops and the heuristic inclusion of a
running of the couplings, generically slow down the evolution.
| [
{
"created": "Thu, 6 Mar 2008 09:30:53 GMT",
"version": "v1"
}
] | 2009-11-18 | [
[
"Armesto",
"Nestor",
""
],
[
"Bondarenko",
"Sergey",
""
],
[
"Milhano",
"Jose Guilherme",
""
],
[
"Quiroga",
"Paloma",
""
]
] | We examine numerically different zero-dimensional reaction-diffusion processes as candidate toy models for high-energy QCD evolution. Of the models examined -- Reggeon Field Theory, Directed Percolation and Reversible Processes -- only the latter shows the behaviour commonly expected, namely an increase of the scattering amplitude with increasing rapidity. Further, we find that increasing recombination terms, quantum loops and the heuristic inclusion of a running of the couplings, generically slow down the evolution. |
0810.5265 | Santosh Kumar Rai | Durmus A. Demir, Mariana Frank, Katri Huitu, Santosh Kumar Rai, Ismail
Turan | Signatures for doubly-charged Higgsinos at colliders | 3 pages, 4 figures, Latex. Submitted for SUSY 2008 proceedings | AIP Conf.Proc.1078:312-314,2009 | 10.1063/1.3051945 | HIP-2008-35/TH, CUMQ/HEP 151 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several supersymmetric models with extended gauge structures predict light
doubly-charged Higgsinos. Their distinctive signature at the large hadron
collider is highlighted by studying their production and decay characteristics.
| [
{
"created": "Wed, 29 Oct 2008 13:12:41 GMT",
"version": "v1"
}
] | 2009-02-02 | [
[
"Demir",
"Durmus A.",
""
],
[
"Frank",
"Mariana",
""
],
[
"Huitu",
"Katri",
""
],
[
"Rai",
"Santosh Kumar",
""
],
[
"Turan",
"Ismail",
""
]
] | Several supersymmetric models with extended gauge structures predict light doubly-charged Higgsinos. Their distinctive signature at the large hadron collider is highlighted by studying their production and decay characteristics. |
1007.0141 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Comment on "Applications of Two-Body Dirac Equations to the Meson
Spectrum with Three versus Two Covariant Interactions, SU(3) Mixing, and
Comparison to a Quasipotential Approach'' by H. W. Crater and J. Schiermeyer | 3 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some considerations in connection with the paper arXiv:1004.2980
[hep-ph] and give a response to the criticism of the quasipotential approach in
our relativistic quark model.
| [
{
"created": "Thu, 1 Jul 2010 11:58:44 GMT",
"version": "v1"
}
] | 2010-07-02 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] | We present some considerations in connection with the paper arXiv:1004.2980 [hep-ph] and give a response to the criticism of the quasipotential approach in our relativistic quark model. |
hep-ph/9704313 | Roland Windmolders | Alessandro Bravar(1), Krzysztof Kurek(2) and Roland Windmolders(3)
((1)Univ.Mainz,(2)Soltan Inst. and Univ.Warsaw,(3)Univ.Mons-Hainaut) | A Monte Carlo for POLarized (semi-inclusive) Deep Inelastic Scattering | 18 pages, LaTeX, 6 eps figures included, to be published in Computer
Physics Communications | Comput.Phys.Commun. 105 (1997) 42-61 | 10.1016/S0010-4655(97)00063-5 | null | hep-ph | null | POLDIS is a Monte Carlo program for polarized (semi-inclusive) deep inelastic
scattering (DIS). Unpolarized DIS events are generated with the existing
lepto-production event generators LEPTO for DIS and AROMA for Heavy Flavor
production. The relevant spin asymmetries are computed at partonic level to
first order in alpha_s for each generated event, and are then convoluted with
the corresponding ratio between the polarized and unpolarized parton
distribution functions (i.e. parton polarization). This procedure provides a
polarization weight for each event. The average of these polarization weights
gives the polarized cross section spin-asymmetry for the generated sample. The
code consists of a set of subroutines to be linked with LEPTO and/or AROMA.
| [
{
"created": "Mon, 14 Apr 1997 09:05:20 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bravar",
"Alessandro",
"",
"Univ.Mainz"
],
[
"Kurek",
"Krzysztof",
"",
"Soltan Inst. and Univ.Warsaw"
],
[
"Windmolders",
"Roland",
"",
"Univ.Mons-Hainaut"
]
] | POLDIS is a Monte Carlo program for polarized (semi-inclusive) deep inelastic scattering (DIS). Unpolarized DIS events are generated with the existing lepto-production event generators LEPTO for DIS and AROMA for Heavy Flavor production. The relevant spin asymmetries are computed at partonic level to first order in alpha_s for each generated event, and are then convoluted with the corresponding ratio between the polarized and unpolarized parton distribution functions (i.e. parton polarization). This procedure provides a polarization weight for each event. The average of these polarization weights gives the polarized cross section spin-asymmetry for the generated sample. The code consists of a set of subroutines to be linked with LEPTO and/or AROMA. |
0711.0914 | Dmitri Kharzeev | F. Karsch, D. Kharzeev and K. Tuchin | Universal properties of bulk viscosity near the QCD phase transition | 14 pages, 2 figures | Phys.Lett.B663:217-221,2008 | 10.1016/j.physletb.2008.01.080 | BNL-NT-07/47, RBRC-703 | hep-ph hep-lat nucl-th | null | We extract the bulk viscosity of hot quark-gluon matter in the presence of
light quarks from the recent lattice data on the QCD equation of state. For
that purpose we extend the sum rule analysis by including the contribution of
light quarks. We also discuss the universal properties of bulk viscosity in the
vicinity of a second order phase transition, as it might occur in the chiral
limit of QCD at fixed strange quark mass and most likely does occur in
two-flavor QCD. We point out that a chiral transition in the O(4) universality
class at zero baryon density as well as the transition at the chiral critical
point which belongs to the Z(2) universality class both lead to the critical
behavior of bulk viscosity. In particular, the latter universality class
implies the divergence of the bulk viscosity, which may be used as a signature
of the critical point. We discuss the physical picture behind the dramatic
increase of bulk viscosity seen in our analysis, and devise possible
experimental tests of related phenomena.
| [
{
"created": "Tue, 6 Nov 2007 16:06:54 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Karsch",
"F.",
""
],
[
"Kharzeev",
"D.",
""
],
[
"Tuchin",
"K.",
""
]
] | We extract the bulk viscosity of hot quark-gluon matter in the presence of light quarks from the recent lattice data on the QCD equation of state. For that purpose we extend the sum rule analysis by including the contribution of light quarks. We also discuss the universal properties of bulk viscosity in the vicinity of a second order phase transition, as it might occur in the chiral limit of QCD at fixed strange quark mass and most likely does occur in two-flavor QCD. We point out that a chiral transition in the O(4) universality class at zero baryon density as well as the transition at the chiral critical point which belongs to the Z(2) universality class both lead to the critical behavior of bulk viscosity. In particular, the latter universality class implies the divergence of the bulk viscosity, which may be used as a signature of the critical point. We discuss the physical picture behind the dramatic increase of bulk viscosity seen in our analysis, and devise possible experimental tests of related phenomena. |
hep-ph/0204286 | Sandhya Choubey | Abhijit Bandyopadhyay, Sandhya Choubey, Srubabati Goswami, D.P. Roy | Implications of the first neutral current data from SNO for Solar
Neutrino Oscillation | Latest data included, minor clarifications and a reference added;
final version to appear in PLB | Phys.Lett.B540:14-19,2002 | 10.1016/S0370-2693(02)02138-X | null | hep-ph astro-ph hep-ex nucl-ex | null | We perform model independent and model dependent analyses of solar neutrino
data including the neutral current event rate from SNO. The inclusion of the
first SNO NC data in the model independent analysis determines the allowed
ranges of $^{8}{B}$ flux normalisation and the $\nu_e$ survival probability
more precisely than what was possible from the SK and SNO CC combination. We
perform global $\nu_e-\nu_{active}$ oscillation analyses of solar neutrino data
using the NC rate instead of the SSM prediction for the $^{8}{B}$ flux, in view
of the large uncertainty in the latter. The LMA gives the best solution, while
the LOW solution is allowed only at the $3\sigma$ level.
| [
{
"created": "Wed, 24 Apr 2002 18:45:08 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2002 19:33:06 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Apr 2002 20:17:32 GMT",
"version": "v3"
},
{
"created": "Sat, 15 Jun 2002 15:09:49 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"Bandyopadhyay",
"Abhijit",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Roy",
"D. P.",
""
]
] | We perform model independent and model dependent analyses of solar neutrino data including the neutral current event rate from SNO. The inclusion of the first SNO NC data in the model independent analysis determines the allowed ranges of $^{8}{B}$ flux normalisation and the $\nu_e$ survival probability more precisely than what was possible from the SK and SNO CC combination. We perform global $\nu_e-\nu_{active}$ oscillation analyses of solar neutrino data using the NC rate instead of the SSM prediction for the $^{8}{B}$ flux, in view of the large uncertainty in the latter. The LMA gives the best solution, while the LOW solution is allowed only at the $3\sigma$ level. |
hep-ph/9810465 | Basarab Nicolescu | Basarab Nicolescu | The Odderon in Theory and Experiment - A mini-Review | 8 pages, ps, Vancouver Conference | Proceedings of the 29th International Conference on High Energy
Physics, Vancouver, Canada, July 23-29, 1998, World Scientific, 1999, pp.
921-923, edited by Alan Astbury, David Axen and Jacob Robinson. | null | LPTPE/UP6/98-13 | hep-ph | null | We review recent theoretical and phenomenological results on both the
perturbative and non-perturbative Odderon. The HERA type of experiments
constitutes a direct probe of the Odderon.
| [
{
"created": "Fri, 23 Oct 1998 17:31:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nicolescu",
"Basarab",
""
]
] | We review recent theoretical and phenomenological results on both the perturbative and non-perturbative Odderon. The HERA type of experiments constitutes a direct probe of the Odderon. |
1103.1307 | Dmitri Kharzeev | Yannis Burnier, Dmitri E. Kharzeev, Jinfeng Liao, Ho-Ung Yee | Chiral magnetic wave at finite baryon density and the electric
quadrupole moment of quark-gluon plasma in heavy ion collisions | 4 pages, 3 figures | Phys.Rev.Lett.107:052303,2011 | 10.1103/PhysRevLett.107.052303 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral Magnetic Wave (CMW) is a gapless collective excitation of quark-gluon
plasma in the presence of external magnetic field that stems from the interplay
of Chiral Magnetic (CME) and Chiral Separation Effects (CSE); it is composed by
the waves of the electric and chiral charge densities coupled by the axial
anomaly. We consider CMW at finite baryon density and find that it induces the
electric quadrupole moment of the quark-gluon plasma produced in heavy ion
collisions: the "poles" of the produced fireball (pointing outside of the
reaction plane) acquire additional positive electric charge, and the "equator"
acquires additional negative charge. We point out that this electric quadrupole
deformation lifts the degeneracy between the elliptic flows of positive and
negative pions leading to $v_2(\pi^+) < v_2(\pi^-)$, and estimate the magnitude
of the effect.
| [
{
"created": "Mon, 7 Mar 2011 15:46:45 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Burnier",
"Yannis",
""
],
[
"Kharzeev",
"Dmitri E.",
""
],
[
"Liao",
"Jinfeng",
""
],
[
"Yee",
"Ho-Ung",
""
]
] | Chiral Magnetic Wave (CMW) is a gapless collective excitation of quark-gluon plasma in the presence of external magnetic field that stems from the interplay of Chiral Magnetic (CME) and Chiral Separation Effects (CSE); it is composed by the waves of the electric and chiral charge densities coupled by the axial anomaly. We consider CMW at finite baryon density and find that it induces the electric quadrupole moment of the quark-gluon plasma produced in heavy ion collisions: the "poles" of the produced fireball (pointing outside of the reaction plane) acquire additional positive electric charge, and the "equator" acquires additional negative charge. We point out that this electric quadrupole deformation lifts the degeneracy between the elliptic flows of positive and negative pions leading to $v_2(\pi^+) < v_2(\pi^-)$, and estimate the magnitude of the effect. |
hep-ph/9802444 | Bodenmueller | Harald Fritzsch | Quark Mass Hierarchy and Flavor Mixing | 14 latex pages | null | null | LMU 01/98 | hep-ph | null | In view of the observed strong hierarchy of the quark and lepton masses and
of the flavor mixing angles it is argued that the description of flavor mixing
must take this into account. One particular interesting way to describe the
flavor mixing, which, however, is not the one used today, emerges, which is
best suited for models of quark mass matrices based on flavor symmetries. We
conclude that the unitarity triangle important for $B$ physics should be close
to or identical to a rectangular triangle. CP violation is maximal in this
sense.
| [
{
"created": "Fri, 27 Feb 1998 10:13:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fritzsch",
"Harald",
""
]
] | In view of the observed strong hierarchy of the quark and lepton masses and of the flavor mixing angles it is argued that the description of flavor mixing must take this into account. One particular interesting way to describe the flavor mixing, which, however, is not the one used today, emerges, which is best suited for models of quark mass matrices based on flavor symmetries. We conclude that the unitarity triangle important for $B$ physics should be close to or identical to a rectangular triangle. CP violation is maximal in this sense. |
hep-ph/0101264 | Gino Isidori | Gilberto Colangelo and Gino Isidori | An introduction to CHPT | 45 pages, Latex. Lectures given at at the 2000 LNF Spring School,
Frascati, Italy, 15-20 May 2000 | null | null | ZU-TH 04/01, CERN-TH/2001-019 | hep-ph | null | These lectures provide an elementary introduction to Chiral Perturbation
Theory, focused on the sector of pseudoscalar meson interactions. Basic
concepts and technical methods of this approach are discussed on general
grounds and with the help of a few specific examples.
| [
{
"created": "Tue, 23 Jan 2001 18:38:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Colangelo",
"Gilberto",
""
],
[
"Isidori",
"Gino",
""
]
] | These lectures provide an elementary introduction to Chiral Perturbation Theory, focused on the sector of pseudoscalar meson interactions. Basic concepts and technical methods of this approach are discussed on general grounds and with the help of a few specific examples. |
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