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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1904.02560 | Leandro Da Rold | Leandro Da Rold (1 and 2) and Alejo N. Rossia (2 and 3) ((1) CONICET,
(2) Instituto Balseiro, (3) DESY) | The Minimal Simple Composite Higgs Model | 39 pages, 9 figures, v2, published version, we have added discussions
concerning the lightest state and a new representation for fermions,
references added | null | 10.1007/JHEP12(2019)023 | DESY 19-005 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most of the analysis of composite Higgs have focussed on the Minimal
Composite Higgs Model, based on the coset
SO(5)$\times$U(1)$_X$/SO(4)$\times$U(1)$_X$. We consider a model based on the
coset of simple groups SO(7)/SO(6), with SO(4)$\times$U(1)$_X$ embedded into
SO(6). This extension of the minimal model leads to a new complex pNGB that has
hypercharge and is a singlet of SU(2)$_L$, with properties mostly determined by
the pattern of symmetry breaking and a mass of order TeV. Composite electroweak
unification also leads to new bosonic and fermion resonances with exotic
charges, not present in the minimal model. The lightest of these resonances is
stable, and in some cases could provide candidates for dark matter. A new rich
phenomenology is expected at LHC.
| [
{
"created": "Thu, 4 Apr 2019 14:04:42 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2019 19:32:45 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Da Rold",
"Leandro",
"",
"1 and 2"
],
[
"Rossia",
"Alejo N.",
"",
"2 and 3"
]
] | Most of the analysis of composite Higgs have focussed on the Minimal Composite Higgs Model, based on the coset SO(5)$\times$U(1)$_X$/SO(4)$\times$U(1)$_X$. We consider a model based on the coset of simple groups SO(7)/SO(6), with SO(4)$\times$U(1)$_X$ embedded into SO(6). This extension of the minimal model leads to a new complex pNGB that has hypercharge and is a singlet of SU(2)$_L$, with properties mostly determined by the pattern of symmetry breaking and a mass of order TeV. Composite electroweak unification also leads to new bosonic and fermion resonances with exotic charges, not present in the minimal model. The lightest of these resonances is stable, and in some cases could provide candidates for dark matter. A new rich phenomenology is expected at LHC. |
hep-ph/0606016 | George W. S. Hou | Wei-Shu Hou | Searching for the Bottom Counterparts of X(3872) and Y(4260) via
$\pi^+\pi^-\Upsilon$ | 4 pages, no figures, version to appear in PRD; expanded, including
comments on LHCb | Phys.Rev.D74:017504,2006 | 10.1103/PhysRevD.74.017504 | null | hep-ph | null | The X(3872) and Y(4260), among a host of charmonium-like mesons, have rather
unusual properties: the former has very small total width, the latter has large
rate into $\pi^+\pi^-J/\psi$ channel. It would not be easy to settle between
the many suggested explanations for their composition. We point out that
discovering the bottom counterparts should shed much light on the issue. The
narrow state can be searched for at the Tevatron via $p\bar p \to
\pi^+\pi^-\Upsilon + X$, but the LHC should be much more promising. The state
with large overlap with $\Upsilon$ can be searched for at B factories via
radiative return $e^+e^- \to \gamma_{\rm ISR} + \pi^+\pi^-\Upsilon$ on
$\Upsilon(5S)$, or by $e^+e^- \to \pi^+\pi^-\Upsilon$ direct scan.
| [
{
"created": "Thu, 1 Jun 2006 16:29:48 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jul 2006 08:02:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hou",
"Wei-Shu",
""
]
] | The X(3872) and Y(4260), among a host of charmonium-like mesons, have rather unusual properties: the former has very small total width, the latter has large rate into $\pi^+\pi^-J/\psi$ channel. It would not be easy to settle between the many suggested explanations for their composition. We point out that discovering the bottom counterparts should shed much light on the issue. The narrow state can be searched for at the Tevatron via $p\bar p \to \pi^+\pi^-\Upsilon + X$, but the LHC should be much more promising. The state with large overlap with $\Upsilon$ can be searched for at B factories via radiative return $e^+e^- \to \gamma_{\rm ISR} + \pi^+\pi^-\Upsilon$ on $\Upsilon(5S)$, or by $e^+e^- \to \pi^+\pi^-\Upsilon$ direct scan. |
1608.00454 | Reza Khosravi | S. Momeni and R. Khosravi | FCNC transition of $B$ to $a_1$ with LCSR | 20 pages, 6 figures | Phys. Rev. D 95, 016009 (2017) | 10.1103/PhysRevD.95.016009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $B\to a_1 \ell^+ \ell^-$ decays occur by the electroweak penguin and box
diagrams which can be performed through the flavor changing neutral current
(FCNC). We calculate the form factors of the FCNC $B \to a_1$ transitions in
the light--cone sum rules approach, up to twist--4 distribution amplitudes of
the axial vector meson $a_1$. Forward--backward asymmetry, as well as branching
ratios of $B\to a_1\ell^{+}\ell^{-}$, and $B\to a_1 \gamma$ decays are
considered. A comparison is also made between our results and the predictions
of other methods.
| [
{
"created": "Mon, 1 Aug 2016 14:47:16 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2016 08:05:18 GMT",
"version": "v2"
}
] | 2017-02-08 | [
[
"Momeni",
"S.",
""
],
[
"Khosravi",
"R.",
""
]
] | The $B\to a_1 \ell^+ \ell^-$ decays occur by the electroweak penguin and box diagrams which can be performed through the flavor changing neutral current (FCNC). We calculate the form factors of the FCNC $B \to a_1$ transitions in the light--cone sum rules approach, up to twist--4 distribution amplitudes of the axial vector meson $a_1$. Forward--backward asymmetry, as well as branching ratios of $B\to a_1\ell^{+}\ell^{-}$, and $B\to a_1 \gamma$ decays are considered. A comparison is also made between our results and the predictions of other methods. |
0705.1920 | Peihong Gu | Pei-Hong Gu, Utpal Sarkar | Leptogenesis, Dark Matter and Higgs Phenomenology at TeV | 7 pages, 3 figures. References added. Accepted by NPB | Nucl.Phys.B789:245-257,2008 | 10.1016/j.nuclphysb.2007.08.004 | null | hep-ph | null | We propose an interesting model of neutrino masses to realize leptogenesis
and dark matter at the TeV scale. A real scalar is introduced to naturally
realize the Majorana masses of the right-handed neutrinos. We also include a
new Higgs doublet that contributes to the dark matter of the universe. The
neutrino masses come from the vacuum expectation value of the triplet Higgs
scalar. The right-handed neutrinos are not constrained by the neutrino masses
and hence they could generate leptogenesis at the TeV scale without subscribing
to resonant leptogenesis. In our model, all new particles could be observable
at the forthcoming Large Hardon Collider or the proposed future International
Linear Collider.
| [
{
"created": "Mon, 14 May 2007 12:03:44 GMT",
"version": "v1"
},
{
"created": "Mon, 21 May 2007 09:18:49 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Aug 2007 08:13:45 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gu",
"Pei-Hong",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We propose an interesting model of neutrino masses to realize leptogenesis and dark matter at the TeV scale. A real scalar is introduced to naturally realize the Majorana masses of the right-handed neutrinos. We also include a new Higgs doublet that contributes to the dark matter of the universe. The neutrino masses come from the vacuum expectation value of the triplet Higgs scalar. The right-handed neutrinos are not constrained by the neutrino masses and hence they could generate leptogenesis at the TeV scale without subscribing to resonant leptogenesis. In our model, all new particles could be observable at the forthcoming Large Hardon Collider or the proposed future International Linear Collider. |
hep-ph/0101238 | Oleg Selugin | S.B. Nurushev, O.V. Selyugin, M.N.Strikhanov | Coulomb-hadron phase factor and spin phenomena in a wide region of
transfer momenta | 9 pages, LaTeX, 4 figures | Czech.J.Phys. 50S1 (2000) 193-200 | 10.1007/s10582-000-0025-x | null | hep-ph | null | The Coulomb-hadron interference effects are examined at small and large $t$.
The methods for the definition of spin-dependent parts of hadron scattering
amplitude are presented. The additional contributions to analyzing power $A_N$
and the double spin correlation parameter $A_{NN}$ owing to the
electromagnetic-hadron interference are determined in the diffraction dip
domain of high-energy elastic hadron scattering.
| [
{
"created": "Mon, 22 Jan 2001 09:45:56 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Nurushev",
"S. B.",
""
],
[
"Selyugin",
"O. V.",
""
],
[
"Strikhanov",
"M. N.",
""
]
] | The Coulomb-hadron interference effects are examined at small and large $t$. The methods for the definition of spin-dependent parts of hadron scattering amplitude are presented. The additional contributions to analyzing power $A_N$ and the double spin correlation parameter $A_{NN}$ owing to the electromagnetic-hadron interference are determined in the diffraction dip domain of high-energy elastic hadron scattering. |
hep-ph/0112206 | Joydip Kundu | Joydip Kundu (MIT), Krishna Rajagopal (MIT) | Mass-Induced Crystalline Color Superconductivity | 12 pages, 4 figures. v2: very small change only | Phys.Rev. D65 (2002) 094022 | 10.1103/PhysRevD.65.094022 | MIT-CTP-3224 | hep-ph nucl-th | null | We demonstrate that crystalline color superconductivity may arise as a result
of pairing between massless quarks and quarks with nonzero mass m_s. Previous
analyses of this phase of cold dense quark matter have all utilized a chemical
potential difference \delta\mu to favor crystalline color superconductivity
over ordinary BCS pairing. In any context in which crystalline color
superconductivity occurs in nature, however, it will be m_s-induced. The effect
of m_s is qualitatively different from that of \delta\mu in one crucial
respect: m_s depresses the value of the BCS gap \Delta_0 whereas \delta\mu
leaves \Delta_0 unchanged. This effect in the BCS phase must be taken into
account before m_s-induced and \delta\mu-induced crystalline color
superconductivity can sensibly be compared.
| [
{
"created": "Fri, 14 Dec 2001 20:10:35 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2002 20:16:24 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kundu",
"Joydip",
"",
"MIT"
],
[
"Rajagopal",
"Krishna",
"",
"MIT"
]
] | We demonstrate that crystalline color superconductivity may arise as a result of pairing between massless quarks and quarks with nonzero mass m_s. Previous analyses of this phase of cold dense quark matter have all utilized a chemical potential difference \delta\mu to favor crystalline color superconductivity over ordinary BCS pairing. In any context in which crystalline color superconductivity occurs in nature, however, it will be m_s-induced. The effect of m_s is qualitatively different from that of \delta\mu in one crucial respect: m_s depresses the value of the BCS gap \Delta_0 whereas \delta\mu leaves \Delta_0 unchanged. This effect in the BCS phase must be taken into account before m_s-induced and \delta\mu-induced crystalline color superconductivity can sensibly be compared. |
1003.1223 | Mikhail Braun | M.A.Braun | BKP states in the inclusive gluon production | 30 pages, 17 figures. Appendix with a new observation added.
Conclusions changed. | Eur.Phys.J.C70:73-90,2010 | 10.1140/epjc/s10052-010-1469-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inclusive cross-section for gluon production is calculated by the dispersion
technique in the NLO in the perturbative QCD with a large number of colours.
The found cross-section coincides with the one derived in the dipole picture.
No trace of the BKP states is found.
| [
{
"created": "Fri, 5 Mar 2010 10:08:43 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Mar 2010 07:33:15 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Mar 2010 04:34:21 GMT",
"version": "v3"
}
] | 2011-02-09 | [
[
"Braun",
"M. A.",
""
]
] | Inclusive cross-section for gluon production is calculated by the dispersion technique in the NLO in the perturbative QCD with a large number of colours. The found cross-section coincides with the one derived in the dipole picture. No trace of the BKP states is found. |
hep-ph/9704342 | Robert Peschanski | R.Peschanski | Dual Shapiro-Virasoro amplitudes in the QCD dipole picture | 4 (1.tex, 3.ps) files: text (tex), tables, 2 figures | Phys.Lett.B409:491-498,1997 | 10.1016/S0370-2693(97)00926-X | T 97/034 (SPhT, Saclay) | hep-ph hep-th | null | Using the QCD dipole picture of BFKL dynamics and the conformal invariance
properties of the BFKL kernel in transverse coordinate space, we show that the
1--to--p dipole densities can be expressed in terms of dual Shapiro- Virasoro
amplitudes B{2p+2} and their generalization including non-zero conformal spins.
We discuss the possibility of an effective closed string theory of interacting
QCD dipoles.
| [
{
"created": "Thu, 17 Apr 1997 08:20:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Peschanski",
"R.",
""
]
] | Using the QCD dipole picture of BFKL dynamics and the conformal invariance properties of the BFKL kernel in transverse coordinate space, we show that the 1--to--p dipole densities can be expressed in terms of dual Shapiro- Virasoro amplitudes B{2p+2} and their generalization including non-zero conformal spins. We discuss the possibility of an effective closed string theory of interacting QCD dipoles. |
hep-ph/9602425 | G. B. Pivovarov | Grigirii Pivovarov (Inst. for Nucl. Res., Moscow) | Gauge Dependence of Four-Fermion QED Green Function and a Breakdown of
Gauge Invariance in Atom-Like Bound State Calculations | 11 pages, LaTex, no figures, to appear in Nucl. Phys. B | Nucl.Phys. B466 (1996) 159-172 | 10.1016/0550-3213(96)00093-4 | INR--917/96 | hep-ph | null | We derive a relation between four-fermion QED Green functions of different
covariant gauges which defines the gauge dependence completely. We use the
derived gauge dependence to check the gauge invariance of atom-like bound state
calculations. We find that the existing QED procedure does not provide gauge
invariant binding energies. A way to a corrected gauge invariant procedure is
pointed out.
| [
{
"created": "Thu, 29 Feb 1996 07:46:45 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Pivovarov",
"Grigirii",
"",
"Inst. for Nucl. Res., Moscow"
]
] | We derive a relation between four-fermion QED Green functions of different covariant gauges which defines the gauge dependence completely. We use the derived gauge dependence to check the gauge invariance of atom-like bound state calculations. We find that the existing QED procedure does not provide gauge invariant binding energies. A way to a corrected gauge invariant procedure is pointed out. |
1110.4335 | Sergio Pastor | Gianpiero Mangano, Gennaro Miele, Sergio Pastor, Ofelia Pisanti,
Srdjan Sarikas | Updated BBN bounds on the cosmological lepton asymmetry for non-zero
theta13 | 16 pages, 5 figures | Phys. Lett. B 708 (2012) 1-5 | 10.1016/j.physletb.2012.01.015 | IFIC/11-58, DSF-13-2011 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the bounds on the cosmological lepton number from Big Bang
Nucleosynthesis (BBN), in light of recent evidences for a large value of the
neutrino mixing angle theta13. The largest asymmetries for electron and muon or
tau neutrinos compatible with 4He and 2H primordial yields are computed versus
the neutrino mass hierarchy and mixing angles. The flavour oscillation dynamics
is traced till the beginning of BBN and neutrino distributions after decoupling
are numerically computed. The latter contains in general, non thermal
distortion due to the onset of flavour oscillations driven by solar squared
mass difference in the temperature range where neutrino scatterings become
inefficient to enforce thermodynamical equilibrium. Depending on the value of
theta13, this translates into a larger value for the effective number of
neutrinos, N_eff. Upper bounds on this parameter are discussed for both
neutrino mass hierarchies. Values for N_eff which are large enough to be
detectable by the Planck experiment are found only for the (presently
disfavoured) range sin^2(theta13)<0.01.
| [
{
"created": "Wed, 19 Oct 2011 16:53:20 GMT",
"version": "v1"
}
] | 2012-02-01 | [
[
"Mangano",
"Gianpiero",
""
],
[
"Miele",
"Gennaro",
""
],
[
"Pastor",
"Sergio",
""
],
[
"Pisanti",
"Ofelia",
""
],
[
"Sarikas",
"Srdjan",
""
]
] | We discuss the bounds on the cosmological lepton number from Big Bang Nucleosynthesis (BBN), in light of recent evidences for a large value of the neutrino mixing angle theta13. The largest asymmetries for electron and muon or tau neutrinos compatible with 4He and 2H primordial yields are computed versus the neutrino mass hierarchy and mixing angles. The flavour oscillation dynamics is traced till the beginning of BBN and neutrino distributions after decoupling are numerically computed. The latter contains in general, non thermal distortion due to the onset of flavour oscillations driven by solar squared mass difference in the temperature range where neutrino scatterings become inefficient to enforce thermodynamical equilibrium. Depending on the value of theta13, this translates into a larger value for the effective number of neutrinos, N_eff. Upper bounds on this parameter are discussed for both neutrino mass hierarchies. Values for N_eff which are large enough to be detectable by the Planck experiment are found only for the (presently disfavoured) range sin^2(theta13)<0.01. |
hep-ph/9710502 | Chris Michael | Chris Michael | Hadron Spectroscopy from the Lattice | to appear in Proceedings of HADRON97, BNL, August 1997, edited S.-U.
Chung, AIP press; 12 pages, Latex, uses aipproc.sty, 5 postscript figures | AIPConf.Proc.432:657-668,1998 | 10.1063/1.55976 | LTH 415 | hep-ph hep-lat | null | Lattice QCD determinations appropriate to hadron spectroscopy are reviewed
with emphasis on the glueball and hybrid meson states in the quenched
approximation. Hybrids are discussed for heavy and for light quarks. The
effects of sea quarks (unquenching) are explored. Heavy-light systems are
presented - particularly excited B mesons.
| [
{
"created": "Tue, 28 Oct 1997 12:03:01 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Michael",
"Chris",
""
]
] | Lattice QCD determinations appropriate to hadron spectroscopy are reviewed with emphasis on the glueball and hybrid meson states in the quenched approximation. Hybrids are discussed for heavy and for light quarks. The effects of sea quarks (unquenching) are explored. Heavy-light systems are presented - particularly excited B mesons. |
1709.10233 | Zhuoran Huang | Zhuo-Ran Huang, Hong-Ying Jin, T.G. Steele and Zhu-Feng Zhang | The Mass and Decay Properties of the $1^{-+}$ Light Hybrid Meson | 5 pages, 2 tables, 1 figure. Proceedings article for the 20th
High-Energy Physics International Conference in Quantum Chromodynamics
(QCD17) in Montpellier, France July 3-7 2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the complete form of the dimension-8 condensate contributions in
the two-point correlator of the ($1^{-+}$,$0^{++}$) light hybrid current
considering the operator mixing under renormalization. We find the inclusion
these higher power corrections as well as the update of $\langle g^3G^3\rangle$
increase the QCD sum rule mass prediction for the $1^{-+}$ light hybrid. The
obtained conservative mass range 1.72--2.60 GeV does not favor the
$\pi_1(1400)$ and the $\pi_1(1600)$ to be pure hybrid states and suggests the
$\pi_1(2015)$ observed by E852 is more likely to have much of a hybrid
constituent. We also study the $b_1\pi$ and $\rho\pi$ decay patterns of the
$1^{-+}$ light hybrid with light-cone QCD sum rules. We obtain a relatively
large partial decay width of the $b_1\pi$ mode, which is consistent with the
predictions from the flux tube models and lattice QCD. More interestingly,
using the tensor interpolating current we find the partial decay width of the
$\rho\pi$ mode is small due to the absence of the leading twist contribution in
the light-cone expansion of the correlation function.
| [
{
"created": "Fri, 29 Sep 2017 04:23:42 GMT",
"version": "v1"
}
] | 2017-10-02 | [
[
"Huang",
"Zhuo-Ran",
""
],
[
"Jin",
"Hong-Ying",
""
],
[
"Steele",
"T. G.",
""
],
[
"Zhang",
"Zhu-Feng",
""
]
] | We calculate the complete form of the dimension-8 condensate contributions in the two-point correlator of the ($1^{-+}$,$0^{++}$) light hybrid current considering the operator mixing under renormalization. We find the inclusion these higher power corrections as well as the update of $\langle g^3G^3\rangle$ increase the QCD sum rule mass prediction for the $1^{-+}$ light hybrid. The obtained conservative mass range 1.72--2.60 GeV does not favor the $\pi_1(1400)$ and the $\pi_1(1600)$ to be pure hybrid states and suggests the $\pi_1(2015)$ observed by E852 is more likely to have much of a hybrid constituent. We also study the $b_1\pi$ and $\rho\pi$ decay patterns of the $1^{-+}$ light hybrid with light-cone QCD sum rules. We obtain a relatively large partial decay width of the $b_1\pi$ mode, which is consistent with the predictions from the flux tube models and lattice QCD. More interestingly, using the tensor interpolating current we find the partial decay width of the $\rho\pi$ mode is small due to the absence of the leading twist contribution in the light-cone expansion of the correlation function. |
0912.4785 | Murugeswaran Duraisamy | Alakabha Datta, Murugeswaran Duraisamy | Model Independent Predictions for Rare Top Decays with Weak Coupling | 14 pages, 4 figures. Accepted in PRD | Phys.Rev.D81:074008,2010 | 10.1103/PhysRevD.81.074008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measurements at B factories have provided important constraints on new
physics in several rare processes involving the B meson. New Physics, if
present in the b quark sector may also affect the top sector. In an effective
Lagrangian approach, we write down operators where effects in the bottom and
the top sector are related. Assuming the couplings of the operators to be of
the same size as the weak coupling g of the Standard Model and taking into
account constraints on new physics from the bottom sector as well as top
branching ratios, we make predictions for the rare top decays t -> cV where V =
\gamma, Z. We find branching fractions for these decays within possible reach
of the LHC. Predictions are also made for t -> sW.
| [
{
"created": "Thu, 24 Dec 2009 04:32:20 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 2010 04:27:41 GMT",
"version": "v2"
}
] | 2010-04-23 | [
[
"Datta",
"Alakabha",
""
],
[
"Duraisamy",
"Murugeswaran",
""
]
] | Measurements at B factories have provided important constraints on new physics in several rare processes involving the B meson. New Physics, if present in the b quark sector may also affect the top sector. In an effective Lagrangian approach, we write down operators where effects in the bottom and the top sector are related. Assuming the couplings of the operators to be of the same size as the weak coupling g of the Standard Model and taking into account constraints on new physics from the bottom sector as well as top branching ratios, we make predictions for the rare top decays t -> cV where V = \gamma, Z. We find branching fractions for these decays within possible reach of the LHC. Predictions are also made for t -> sW. |
1606.00951 | Xiao-Gang He | Alper Hayreter, Xiao-Gang He, German Valencia | Yukawa sector for LFV in $h\to \mu\tau$ and CP violation in $h\to
\tau\tau$ | RevTex, 19 pages with two figures | Phys. Rev. D 94, 075002 (2016) | 10.1103/PhysRevD.94.075002 | CoEPP-MN-16-14 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs boson discovered at the LHC opened a new chapter for particle
physics. Its properties need to be studied in detail to distinguish a purely
standard model (SM) Higgs boson from one of many scalars in an enlarged Higgs
sector. The CMS collaboration has reported a possible lepton flavor violating
(LFV) signal $h\to\mu\tau$, which if confirmed, implies that the Higgs sector
is larger than in the SM. New physics responsible for this type of decay may,
in general, also introduce other observable effects such as charge-parity (CP)
violation in $h\to \tau\tau$. We study two types of models that single out the
third generation and can induce large $h \to \mu\tau$ rates with different
consequences for CP violation in $h \to \tau \tau$. Predictions for the size of
the CP violating couplings require knowledge of the lepton Yukawa matrices and
we discuss this in the context of two different textures considering all
existing constraints.
| [
{
"created": "Fri, 3 Jun 2016 02:32:51 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Hayreter",
"Alper",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Valencia",
"German",
""
]
] | The Higgs boson discovered at the LHC opened a new chapter for particle physics. Its properties need to be studied in detail to distinguish a purely standard model (SM) Higgs boson from one of many scalars in an enlarged Higgs sector. The CMS collaboration has reported a possible lepton flavor violating (LFV) signal $h\to\mu\tau$, which if confirmed, implies that the Higgs sector is larger than in the SM. New physics responsible for this type of decay may, in general, also introduce other observable effects such as charge-parity (CP) violation in $h\to \tau\tau$. We study two types of models that single out the third generation and can induce large $h \to \mu\tau$ rates with different consequences for CP violation in $h \to \tau \tau$. Predictions for the size of the CP violating couplings require knowledge of the lepton Yukawa matrices and we discuss this in the context of two different textures considering all existing constraints. |
hep-ph/9907484 | Lianshou Liu | Wang Qin, Li Zhiming and Liu Lianshou | Model Investigation of Non-Thermal Phase Transition in High Energy
Collisions | 8 pages 3 PS figures | Sci. China Ser. A43 (2000) 780-784 | null | HZPP-9904 | hep-ph | null | The Non-thermal phase transition in high energy collisions is studied in some
detail in the framework of random cascade model. The relation between the
characteristic parameter $\lambda_q$ of phase transition and the rank $q$ of
moment is obtained using Monte Carlo simulation, and the existence of two
phases in self-similarly cascading multiparticle systems is shown. The relation
between the critical point $q_c$ of phase transition on the fluctuation
parameter $\alpha$ is obtained and compared with the experimental results from
NA22. The same study is carried out also by analytical calculation under
central limit approximation. The range of validity of the central limit
approximation is discussed.
| [
{
"created": "Mon, 26 Jul 1999 01:59:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Qin",
"Wang",
""
],
[
"Zhiming",
"Li",
""
],
[
"Lianshou",
"Liu",
""
]
] | The Non-thermal phase transition in high energy collisions is studied in some detail in the framework of random cascade model. The relation between the characteristic parameter $\lambda_q$ of phase transition and the rank $q$ of moment is obtained using Monte Carlo simulation, and the existence of two phases in self-similarly cascading multiparticle systems is shown. The relation between the critical point $q_c$ of phase transition on the fluctuation parameter $\alpha$ is obtained and compared with the experimental results from NA22. The same study is carried out also by analytical calculation under central limit approximation. The range of validity of the central limit approximation is discussed. |
1707.03837 | Diptimoy Ghosh | Pritibhajan Byakti, Diptimoy Ghosh, Tarun Sharma | Note on gauge and gravitational anomalies of discrete $Z_N$ symmetries | Version to appear in JHEP | null | 10.1007/JHEP01(2018)015 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we discuss the consistency conditions which a discrete $Z_N$
symmetry should satisfy in order that it is not violated by gauge and
gravitational instantons. As examples, we enlist all the $Z_N$ ${\cal
R}$-symmetries as well as non-${\cal R}$ $Z_N$ symmetries (N=2,3,4) in the
minimally supersymmetric standard model (MSSM) that are free from gauge and
gravitational anomalies. We show that there exists non-anomalous discrete
symmetries that forbid Baryon number violation up to dimension 6 level (in
superspace). We also observe that there exists no non-anomalous $Z_3$ ${\cal
R}$-symmetry in the MSSM. Furthermore, we point out that in a theory with one
Majorana spin 3/2 gravitino, a large class of $Z_4$ ${\cal R}$-symmetries are
violated in the presence of Eguchi-Hanson (EH) gravitational instanton. This is
also in general true for higher $Z_N$ ${\cal R}$-symmetries. We also notice
that in 4 dimensional ${\cal N}=1$ supergravity, the global $U(1)$ ${\cal
R}$-symmetry is always violated by the EH instanton irrespective of the matter
content of the theory.
| [
{
"created": "Wed, 12 Jul 2017 18:00:05 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Aug 2017 15:02:45 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Dec 2017 15:05:22 GMT",
"version": "v3"
}
] | 2018-02-14 | [
[
"Byakti",
"Pritibhajan",
""
],
[
"Ghosh",
"Diptimoy",
""
],
[
"Sharma",
"Tarun",
""
]
] | In this note, we discuss the consistency conditions which a discrete $Z_N$ symmetry should satisfy in order that it is not violated by gauge and gravitational instantons. As examples, we enlist all the $Z_N$ ${\cal R}$-symmetries as well as non-${\cal R}$ $Z_N$ symmetries (N=2,3,4) in the minimally supersymmetric standard model (MSSM) that are free from gauge and gravitational anomalies. We show that there exists non-anomalous discrete symmetries that forbid Baryon number violation up to dimension 6 level (in superspace). We also observe that there exists no non-anomalous $Z_3$ ${\cal R}$-symmetry in the MSSM. Furthermore, we point out that in a theory with one Majorana spin 3/2 gravitino, a large class of $Z_4$ ${\cal R}$-symmetries are violated in the presence of Eguchi-Hanson (EH) gravitational instanton. This is also in general true for higher $Z_N$ ${\cal R}$-symmetries. We also notice that in 4 dimensional ${\cal N}=1$ supergravity, the global $U(1)$ ${\cal R}$-symmetry is always violated by the EH instanton irrespective of the matter content of the theory. |
hep-ph/0512362 | Michael Maziashvili | Michael Maziashvili | Particle escape into extra space | 3 pages | Phys.Lett.B635:36-38,2006 | 10.1016/j.physletb.2006.02.032 | null | hep-ph | null | We focus on escape of a spin integer particle the challenge for which is of
course that the corresponding field equation contains the second order time
derivative and, in general, may be problematic for interpreting the
extra-dimensional part of the field as a wave function for the KK modes as it
is usually regarded.
| [
{
"created": "Thu, 29 Dec 2005 13:23:08 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2006 09:16:29 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Maziashvili",
"Michael",
""
]
] | We focus on escape of a spin integer particle the challenge for which is of course that the corresponding field equation contains the second order time derivative and, in general, may be problematic for interpreting the extra-dimensional part of the field as a wave function for the KK modes as it is usually regarded. |
0911.2806 | James Maxin | James A. Maxin, Van E. Mayes, and D.V. Nanopoulos | A Note on Modulus-dominated SUSY-breaking | 14 pages, 2 figures | Phys.Lett.B690:501-507,2010 | 10.1016/j.physletb.2010.05.077 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In models where supersymmetry-breaking is dominated by the Kahler moduli
and/or the universal dilaton, the B-parameter at the unification scale should
be consistent with the value of tan(beta) at the electroweak scale determined
by minimization of the Higgs potential triggering REWSB. We study such models
employing a self-consistent determination of the B-parameter. In particular, we
study the viability of a generic model, as well as M-theory and Type IIB flux
compactifications with modulus-dominated supersymmetric soft-terms from the GUT
scale, M_{GUT}=2x10^{16}GeV.
| [
{
"created": "Sat, 14 Nov 2009 20:51:38 GMT",
"version": "v1"
}
] | 2010-09-16 | [
[
"Maxin",
"James A.",
""
],
[
"Mayes",
"Van E.",
""
],
[
"Nanopoulos",
"D. V.",
""
]
] | In models where supersymmetry-breaking is dominated by the Kahler moduli and/or the universal dilaton, the B-parameter at the unification scale should be consistent with the value of tan(beta) at the electroweak scale determined by minimization of the Higgs potential triggering REWSB. We study such models employing a self-consistent determination of the B-parameter. In particular, we study the viability of a generic model, as well as M-theory and Type IIB flux compactifications with modulus-dominated supersymmetric soft-terms from the GUT scale, M_{GUT}=2x10^{16}GeV. |
0802.1286 | Tadafumi Ohsaku | Tadafumi Ohsaku | Dynamical Mass Generations and Collective Excitations in the
(Supersymmetric-)Nambu$-$Jona-Lasinio Model and a Gauge Theory with
Left-Right-Asymmetric Majorana Mass Terms | 98 pages, mathematical aspects enlarged | null | null | null | hep-ph hep-th math-ph math.MP math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The structure of effective potential surface of the Nambu$-$Jona-Lasinio
(NJL) model with right-left asymmetric Majorana mass terms (corresponds to the
single-flavor type-II seesaw situation of neutrino) is investigated. After the
dynamical generation of Dirac mass, two collective modes appear similar to the
case of ordinary NJL model, and the phase mode (phason), which corresponds to
majoron or pion at vanishing Majorana mass parameter(s), has an excitation
mass. The mechanism of generation of phason as a pseudo Nambu-Goldstone boson
is examined by a mathematical manner, summarized into a theorem
(claims as the generalized Nambu-Goldstone theorem). The mass of phason is
also evaluated in a supersymmetric version of the NJL-type model, and phason
mass takes the order of that of axion commonly accepted today. An
$SU(2_{c})$-gauge model is constructed for the context of neutrino seesaw
mechanism, and the Schwinger-Dyson equation of dynamical mass functions is
examined. Several physical implications such as decay modes of phason, a
non-linear sigma model for phason are given. It is proposed that the
method/result of this paper can be applied to an understanding on the origin of
the Kobayashi-Maskawa matrix.
| [
{
"created": "Sat, 9 Feb 2008 20:03:25 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2010 15:01:24 GMT",
"version": "v10"
},
{
"created": "Fri, 4 Apr 2008 21:15:26 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Oct 2008 16:30:54 GMT",
"version": "v3"
},
{
"cre... | 2010-12-21 | [
[
"Ohsaku",
"Tadafumi",
""
]
] | The structure of effective potential surface of the Nambu$-$Jona-Lasinio (NJL) model with right-left asymmetric Majorana mass terms (corresponds to the single-flavor type-II seesaw situation of neutrino) is investigated. After the dynamical generation of Dirac mass, two collective modes appear similar to the case of ordinary NJL model, and the phase mode (phason), which corresponds to majoron or pion at vanishing Majorana mass parameter(s), has an excitation mass. The mechanism of generation of phason as a pseudo Nambu-Goldstone boson is examined by a mathematical manner, summarized into a theorem (claims as the generalized Nambu-Goldstone theorem). The mass of phason is also evaluated in a supersymmetric version of the NJL-type model, and phason mass takes the order of that of axion commonly accepted today. An $SU(2_{c})$-gauge model is constructed for the context of neutrino seesaw mechanism, and the Schwinger-Dyson equation of dynamical mass functions is examined. Several physical implications such as decay modes of phason, a non-linear sigma model for phason are given. It is proposed that the method/result of this paper can be applied to an understanding on the origin of the Kobayashi-Maskawa matrix. |
hep-ph/0302198 | Ansgar Denner | A. Denner, S. Dittmaier, M. Roth, M. M. Weber | Electroweak radiative corrections to e+ e- -> nu nubar H | 35 pages, Latex, 17 postscript files | Nucl.Phys.B660:289-321,2003 | 10.1016/S0550-3213(03)00269-4 | KA-TP-03-2003, MPI-PhT/2003-08, PSI-PR-03-05 | hep-ph | null | The complete electroweak O(alpha) radiative corrections to the Higgs-boson
production processes e+ e- -> nu_l anti-nu_l H (l=e,mu,tau) are calculated in
the electroweak Standard Model. For e+ e- -> nu_e anti-nu_e H, where ZH
production and W-boson fusion contribute, both production channels are added
coherently. The calculation of the corrections is described in some detail
including, in particular, the treatment of the Z-boson resonance in the
ZH-production channel. The discussion of numerical results focusses on the
total cross section as well as on angular and energy distributions of the Higgs
boson. In the Gmu-scheme, the bulk of the corrections is due to initial-state
radiation. The corrections turn out to reduce the total cross section by \sim
10% for high energies, where the W-boson fusion dominates. In this region, the
corrections depend only weakly on the energy and the production angle of the
Higgs boson. Based on an analysis of the leading universal corrections, a
simple improved Born approximation is introduced. This approximation describes
the corrected cross section within about 3%.
| [
{
"created": "Fri, 21 Feb 2003 16:50:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Roth",
"M.",
""
],
[
"Weber",
"M. M.",
""
]
] | The complete electroweak O(alpha) radiative corrections to the Higgs-boson production processes e+ e- -> nu_l anti-nu_l H (l=e,mu,tau) are calculated in the electroweak Standard Model. For e+ e- -> nu_e anti-nu_e H, where ZH production and W-boson fusion contribute, both production channels are added coherently. The calculation of the corrections is described in some detail including, in particular, the treatment of the Z-boson resonance in the ZH-production channel. The discussion of numerical results focusses on the total cross section as well as on angular and energy distributions of the Higgs boson. In the Gmu-scheme, the bulk of the corrections is due to initial-state radiation. The corrections turn out to reduce the total cross section by \sim 10% for high energies, where the W-boson fusion dominates. In this region, the corrections depend only weakly on the energy and the production angle of the Higgs boson. Based on an analysis of the leading universal corrections, a simple improved Born approximation is introduced. This approximation describes the corrected cross section within about 3%. |
2407.06803 | Mohammad Sajjad Athar | A. Fatima, M. Sajjad Athar, and S. K. Singh | Charged current weak production of $\Delta(1232)$ induced by electrons
and positrons | 21 pages, 9 figures, and 1 table | null | null | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | The charged current weak production of $\Delta (1232)$ from the free proton
target induced by the electron/positron in the intermediate energy range
corresponding to the beam energy available at JLab and Mainz, has been studied.
The results for the differential scattering cross section
$\frac{d\sigma}{dQ^2}$, the angular distribution
$\frac{d\sigma}{d\Omega_{\Delta}}$, and the total scattering cross section
$\sigma(E_e)$ for both the electron and positron induced processes are
presented, for the various energies in the range of 0.5--4~GeV. The cross
section $\sigma(E_e)$ is found to be of the order of $10^{-39}$~cm$^{2}$ for
the electron/positron energies in the few GeV range. The availability of
electron/positron beams having well defined energy and direction with very high
luminosity of the order of $10^{38}-10^{39}$~cm$^{-2}$~sec$^{-1}$, makes it
possible to observe the weak charged current production of $\Delta(1232)$ and
determine the axial vector form factors $C_{i}^{A} (Q^2);~(i=3-5)$. The
sensitivity of the differential cross section $\frac{d\sigma}{dQ^2}$ to the
subdominant form factors $C_{3}^{A}(Q^2)$ and $C_{4}^{A} (Q^2)$ is found to be
strong enough, especially in the low $Q^2$ region, which can be used to
determine them phenomenologically and to test the various theoretical models
proposed to calculate them.
| [
{
"created": "Tue, 9 Jul 2024 12:17:11 GMT",
"version": "v1"
}
] | 2024-07-10 | [
[
"Fatima",
"A.",
""
],
[
"Athar",
"M. Sajjad",
""
],
[
"Singh",
"S. K.",
""
]
] | The charged current weak production of $\Delta (1232)$ from the free proton target induced by the electron/positron in the intermediate energy range corresponding to the beam energy available at JLab and Mainz, has been studied. The results for the differential scattering cross section $\frac{d\sigma}{dQ^2}$, the angular distribution $\frac{d\sigma}{d\Omega_{\Delta}}$, and the total scattering cross section $\sigma(E_e)$ for both the electron and positron induced processes are presented, for the various energies in the range of 0.5--4~GeV. The cross section $\sigma(E_e)$ is found to be of the order of $10^{-39}$~cm$^{2}$ for the electron/positron energies in the few GeV range. The availability of electron/positron beams having well defined energy and direction with very high luminosity of the order of $10^{38}-10^{39}$~cm$^{-2}$~sec$^{-1}$, makes it possible to observe the weak charged current production of $\Delta(1232)$ and determine the axial vector form factors $C_{i}^{A} (Q^2);~(i=3-5)$. The sensitivity of the differential cross section $\frac{d\sigma}{dQ^2}$ to the subdominant form factors $C_{3}^{A}(Q^2)$ and $C_{4}^{A} (Q^2)$ is found to be strong enough, especially in the low $Q^2$ region, which can be used to determine them phenomenologically and to test the various theoretical models proposed to calculate them. |
hep-ph/9904324 | Muneyuki Ishida | Rukmani Mohanta, Anjan K. Giri, Mohinder P. Khanna (Panjab
University), Muneyuki Ishida(TIT), Shin Ishida (Nihon University) and Masuho
Oda(Kokushikan University) | Hadronic Weak Decays of Lambda b Baryon in the Covariant Oscillator
Quark Model | 10 pages, uses ptptex.sty | Prog.Theor.Phys.101:959-969,1999 | 10.1143/PTP.101.959 | NUP-A-99-5 | hep-ph | null | Cabibbo allowed two-body hadronic weak decays of Lambda b baryons are
analyzed in the factorization approximation. We use the covariant oscillator
quark model to evaluate the heavy to heavy and heavy to light form factors.
When applied in the heavy quark limit, our form factors satisfy all the
constraints imposed by heavy quark symmetry. The decay rates and up-down
asymmetries for Lambda b baryon decaying into Lambda c +P(V) are calculated. It
is found that the up-down asymmetry is negative in all these decay modes.
Furthermore, the prediction Br(Lambda b to Lambda+J/psi)=2.49 times 10^-4 is
consistent with the recent experimental data. Finally it is pointed out that
the CKM-Wolfenstein parameter rho^2+eta^2, where eta is the CP phase, can be
determined from the ratio of the widths Lambda b to Lambda bar D^0 and Lambda b
to Lambda J/psi, independent of the QCD parameter. The value of (rho^2
+eta^2)^1/2 calculated in our model agrees very well with the value recently
predicted by Rosner.
| [
{
"created": "Wed, 14 Apr 1999 03:43:46 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Mohanta",
"Rukmani",
"",
"Panjab\n University"
],
[
"Giri",
"Anjan K.",
"",
"Panjab\n University"
],
[
"Khanna",
"Mohinder P.",
"",
"Panjab\n University"
],
[
"Ishida",
"Muneyuki",
"",
"TIT"
],
[
"Ishida",
"Shin",
"",
... | Cabibbo allowed two-body hadronic weak decays of Lambda b baryons are analyzed in the factorization approximation. We use the covariant oscillator quark model to evaluate the heavy to heavy and heavy to light form factors. When applied in the heavy quark limit, our form factors satisfy all the constraints imposed by heavy quark symmetry. The decay rates and up-down asymmetries for Lambda b baryon decaying into Lambda c +P(V) are calculated. It is found that the up-down asymmetry is negative in all these decay modes. Furthermore, the prediction Br(Lambda b to Lambda+J/psi)=2.49 times 10^-4 is consistent with the recent experimental data. Finally it is pointed out that the CKM-Wolfenstein parameter rho^2+eta^2, where eta is the CP phase, can be determined from the ratio of the widths Lambda b to Lambda bar D^0 and Lambda b to Lambda J/psi, independent of the QCD parameter. The value of (rho^2 +eta^2)^1/2 calculated in our model agrees very well with the value recently predicted by Rosner. |
1901.01635 | Igor Altsybeev | Igor Altsybeev | Recent developments in particle yield fluctuation measurements | Proceedings of XXIV Baldin ISHEPP (Dubna, Russia, 2018) | EPJ Web of Conferences 204, 2019 | 10.1051/epjconf/201920403003 | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In relativistic heavy-ion collisions, properties of the initial state and
effects arising during evolution of the medium, such as a transition between
the hadronic and partonic phases, should reflect themselves in event-by-event
fluctuations of the number of produced particles. In this paper, recent
measurements of several event-by-event observables, namely, dynamical
fluctuations of relative particle yields and forward-backward correlations of
different types, are discussed. Also, new observables for forward-backward
correlation studies are proposed: correlations between ratios of identified
particle yields in two separated acceptance intervals and the correlation
between the ratio in one interval and average transverse momentum in another.
| [
{
"created": "Mon, 7 Jan 2019 01:11:26 GMT",
"version": "v1"
}
] | 2019-04-05 | [
[
"Altsybeev",
"Igor",
""
]
] | In relativistic heavy-ion collisions, properties of the initial state and effects arising during evolution of the medium, such as a transition between the hadronic and partonic phases, should reflect themselves in event-by-event fluctuations of the number of produced particles. In this paper, recent measurements of several event-by-event observables, namely, dynamical fluctuations of relative particle yields and forward-backward correlations of different types, are discussed. Also, new observables for forward-backward correlation studies are proposed: correlations between ratios of identified particle yields in two separated acceptance intervals and the correlation between the ratio in one interval and average transverse momentum in another. |
hep-ph/0612366 | Michael Kuchiev | Victor Flambaum and Michael Kuchiev | Charge density of a positively charged vector boson may be negative | 4 pages, revtex | Phys.Rev.Lett.98:181805,2007 | 10.1103/PhysRevLett.98.181805 | null | hep-ph | null | The charge density of vector particles, for example W, may change sign. The
effect manifests itself even for a free propagation; when the energy of the
W-boson is higher than sqrt{2}m and the standing-wave is considered the charge
density oscillates in space. The charge density of W also changes sign in close
vicinity of a Coulomb center. The dependence of this effect on the g-factor for
an arbitrary vector boson, for example rho-meson, is discussed. An origin of
this surprising effect is traced to the electric quadrupole moment and
spin-orbit interaction of vector particles. Their contributions to the current
have a polarization nature. The charge density of this current, rho = -\nabla
\cdot P, where P is an effective polarization vector that depends on the
quadrupole moment and spin-orbit interaction, oscillates in space, producing
zero contribution to the total charge.
| [
{
"created": "Fri, 29 Dec 2006 04:05:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Flambaum",
"Victor",
""
],
[
"Kuchiev",
"Michael",
""
]
] | The charge density of vector particles, for example W, may change sign. The effect manifests itself even for a free propagation; when the energy of the W-boson is higher than sqrt{2}m and the standing-wave is considered the charge density oscillates in space. The charge density of W also changes sign in close vicinity of a Coulomb center. The dependence of this effect on the g-factor for an arbitrary vector boson, for example rho-meson, is discussed. An origin of this surprising effect is traced to the electric quadrupole moment and spin-orbit interaction of vector particles. Their contributions to the current have a polarization nature. The charge density of this current, rho = -\nabla \cdot P, where P is an effective polarization vector that depends on the quadrupole moment and spin-orbit interaction, oscillates in space, producing zero contribution to the total charge. |
2112.02477 | Bin Yan | Yandong Liu and Bin Yan | Searching for the axion-like particle at the EIC | 5 pages, 5 figures, published version | null | 10.1088/1674-1137/acbbc0 | LA-UR-21-31766 | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The axion-like particle (ALP) is a well motivated new particle candidate of
beyond the Standard Model. In this work, we propose to probe the ALP through
the photon fusion scattering at the upcoming Electron-Ion Collider (EIC) with
electron and proton energy $E_e=20~{\rm GeV}$ and $E_p=250~{\rm GeV}$. It shows
that we could constrain the effective coupling strength between ALP and photons
to be $0.2~{\rm TeV}^{-1}$ at $2\sigma$ confidence level with the integrated
luminosity of $300~{\rm fb}^{-1}$ for the mass range $m_a\in [5,40]~{\rm GeV}$.
Such bound could be much improved if we consider the nucleus beam at the EIC.
We also demonstrate that the limits from the EIC could be stronger than the off
$Z$-pole measurement at the LEP and the Light-by-Light scattering with pp
collision at the LHC.
| [
{
"created": "Sun, 5 Dec 2021 04:52:05 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2023 01:41:04 GMT",
"version": "v2"
}
] | 2023-03-29 | [
[
"Liu",
"Yandong",
""
],
[
"Yan",
"Bin",
""
]
] | The axion-like particle (ALP) is a well motivated new particle candidate of beyond the Standard Model. In this work, we propose to probe the ALP through the photon fusion scattering at the upcoming Electron-Ion Collider (EIC) with electron and proton energy $E_e=20~{\rm GeV}$ and $E_p=250~{\rm GeV}$. It shows that we could constrain the effective coupling strength between ALP and photons to be $0.2~{\rm TeV}^{-1}$ at $2\sigma$ confidence level with the integrated luminosity of $300~{\rm fb}^{-1}$ for the mass range $m_a\in [5,40]~{\rm GeV}$. Such bound could be much improved if we consider the nucleus beam at the EIC. We also demonstrate that the limits from the EIC could be stronger than the off $Z$-pole measurement at the LEP and the Light-by-Light scattering with pp collision at the LHC. |
2308.07566 | Supriya Pan | Supriya Pan (1 and 2), Kaustav Chakraborty (1), Srubabati Goswami (1)
((1) Physical Research Laboratory, Ahmedabad, (2) Indian Institute of
Technology, Gandhinagar) | Sensitivity to CP Discovery in the Presence of Lorentz Invariance
Violating Potential at T2HK/T2HKK | 10 pages, 11 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Investigation of conservation/violation of CP symmetry in the leptonic sector
is very essential in understanding the evolution of the universe. Lorentz
invariance and CPT are fundamental symmetries of nature. The violation of
Lorentz invariance can also lead to CPT violations. The standard three flavour
neutrino oscillation framework presents a scenario to observe the signature of
Lorentz invariance and CP violations. This work focuses on the effect of
Lorentz invariance violating (LIV) parameters on the sensitivity to CP
violation. We investigate the sensitivity in two proposed configurations of the
upcoming T2HK experiment: (i) one detector each placed at 295 km and 1100 km,
and (ii) two identical detectors at 295 km. This study probes the effect of CPT
violating parameters $a_{e\mu},a_{e\tau},a_{\mu\tau}$.
| [
{
"created": "Tue, 15 Aug 2023 04:23:31 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2023 09:35:29 GMT",
"version": "v2"
}
] | 2023-09-25 | [
[
"Pan",
"Supriya",
"",
"1 and 2"
],
[
"Chakraborty",
"Kaustav",
""
],
[
"Goswami",
"Srubabati",
""
]
] | Investigation of conservation/violation of CP symmetry in the leptonic sector is very essential in understanding the evolution of the universe. Lorentz invariance and CPT are fundamental symmetries of nature. The violation of Lorentz invariance can also lead to CPT violations. The standard three flavour neutrino oscillation framework presents a scenario to observe the signature of Lorentz invariance and CP violations. This work focuses on the effect of Lorentz invariance violating (LIV) parameters on the sensitivity to CP violation. We investigate the sensitivity in two proposed configurations of the upcoming T2HK experiment: (i) one detector each placed at 295 km and 1100 km, and (ii) two identical detectors at 295 km. This study probes the effect of CPT violating parameters $a_{e\mu},a_{e\tau},a_{\mu\tau}$. |
0907.4374 | Lorenzo Ubaldi | Stefano Profumo (UCSC), Kris Sigurdson (UBC) and Lorenzo Ubaldi (UCSC) | Can we discover dual-component thermal WIMP dark matter? | 44 pages, 16 figures, revised version published in JCAP | JCAP 0912:016,2009 | 10.1088/1475-7516/2009/12/016 | null | hep-ph astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the question of whether the upcoming generation of dark matter
search experiments and colliders will be able to discover if the dark matter in
the Universe has two components of weakly interacting massive particles
(WIMPs). We outline a model-independent approach, and we study the specific
cases of (1) direct detection with low-background 1 ton noble-gas detectors and
(2) a 0.5 TeV center of mass energy electron-positron linear collider. We also
analyze the case of indirect detection via two gamma-ray lines, which would
provide a verification of such a discovery, although multiple gamma-ray lines
can in principle originate from the annihilation of a single dark matter
particle. For each search "channel", we outline a few assumptions to relate the
very small set of parameters we consider (defining the masses of the two WIMPs
and their relative abundance in the overall dark matter density) with the
relevant detection rates. We then draw general conclusions on which corners of
a generic dual-component dark matter scenario can be explored with current and
next generation experiments. We find that in all channels the ideal setup is
one where the relative mass splitting between the two WIMP species is of order
1, and where the two dark matter components contribute in a ratio close to 1:1
to the overall dark matter content of the Universe. Interestingly, in the case
of direct detection, future experiments might detect multiple states even if
only ~ 10% of the energy-density of dark matter in the Universe is in the
subdominant species.
| [
{
"created": "Sat, 25 Jul 2009 06:36:37 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Oct 2009 18:49:02 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Dec 2009 13:48:17 GMT",
"version": "v3"
}
] | 2009-12-23 | [
[
"Profumo",
"Stefano",
"",
"UCSC"
],
[
"Sigurdson",
"Kris",
"",
"UBC"
],
[
"Ubaldi",
"Lorenzo",
"",
"UCSC"
]
] | We address the question of whether the upcoming generation of dark matter search experiments and colliders will be able to discover if the dark matter in the Universe has two components of weakly interacting massive particles (WIMPs). We outline a model-independent approach, and we study the specific cases of (1) direct detection with low-background 1 ton noble-gas detectors and (2) a 0.5 TeV center of mass energy electron-positron linear collider. We also analyze the case of indirect detection via two gamma-ray lines, which would provide a verification of such a discovery, although multiple gamma-ray lines can in principle originate from the annihilation of a single dark matter particle. For each search "channel", we outline a few assumptions to relate the very small set of parameters we consider (defining the masses of the two WIMPs and their relative abundance in the overall dark matter density) with the relevant detection rates. We then draw general conclusions on which corners of a generic dual-component dark matter scenario can be explored with current and next generation experiments. We find that in all channels the ideal setup is one where the relative mass splitting between the two WIMP species is of order 1, and where the two dark matter components contribute in a ratio close to 1:1 to the overall dark matter content of the Universe. Interestingly, in the case of direct detection, future experiments might detect multiple states even if only ~ 10% of the energy-density of dark matter in the Universe is in the subdominant species. |
1502.05703 | Sascha Caron | Abraham Achterberg, Simone Amoroso, Sascha Caron, Luc Hendriks,
Roberto Ruiz de Austri, Christoph Weniger | A description of the Galactic Center excess in the Minimal
Supersymmetric Standard Model | Large extension of previous paper: 2 more solutions found in the MSSM
(Bino-Higgsino, Bino-Wino-Higgsino into WW and Bino into ttbar), added
description on extra fit uncertainties, added description on flavor
observables, added discussion on dwarf limits | null | 10.1088/1475-7516/2015/08/006 | null | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations with the Fermi Large Area Telescope (LAT) indicate an excess in
gamma rays originating from the center of our Galaxy. A possible explanation
for this excess is the annihilation of Dark Matter particles. We have
investigated the annihilation of neutralinos as Dark Matter candidates within
the phenomenological Minimal Supersymmetric Standard Model (pMSSM). An
iterative particle filter approach was used to search for solutions within the
pMSSM. We found solutions that are consistent with astroparticle physics and
collider experiments, and provide a fit to the energy spectrum of the excess.
The neutralino is a Bino/Higgsino or Bino/Wino/Higgsino mixture with a mass in
the range $84-92$~GeV or $87-97$~GeV annihilating into W bosons. A third
solutions is found for a neutralino of mass $174-187$~GeV annihilating into top
quarks. The best solutions yield a Dark Matter relic density $0.06 < \Omega h^2
<0.13$. These pMSSM solutions make clear forecasts for LHC, direct and indirect
DM detection experiments. If the MSSM explanation of the excess seen by
Fermi-LAT is correct, a DM signal might be discovered soon.
| [
{
"created": "Thu, 19 Feb 2015 20:55:49 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2015 16:10:18 GMT",
"version": "v2"
}
] | 2015-08-19 | [
[
"Achterberg",
"Abraham",
""
],
[
"Amoroso",
"Simone",
""
],
[
"Caron",
"Sascha",
""
],
[
"Hendriks",
"Luc",
""
],
[
"de Austri",
"Roberto Ruiz",
""
],
[
"Weniger",
"Christoph",
""
]
] | Observations with the Fermi Large Area Telescope (LAT) indicate an excess in gamma rays originating from the center of our Galaxy. A possible explanation for this excess is the annihilation of Dark Matter particles. We have investigated the annihilation of neutralinos as Dark Matter candidates within the phenomenological Minimal Supersymmetric Standard Model (pMSSM). An iterative particle filter approach was used to search for solutions within the pMSSM. We found solutions that are consistent with astroparticle physics and collider experiments, and provide a fit to the energy spectrum of the excess. The neutralino is a Bino/Higgsino or Bino/Wino/Higgsino mixture with a mass in the range $84-92$~GeV or $87-97$~GeV annihilating into W bosons. A third solutions is found for a neutralino of mass $174-187$~GeV annihilating into top quarks. The best solutions yield a Dark Matter relic density $0.06 < \Omega h^2 <0.13$. These pMSSM solutions make clear forecasts for LHC, direct and indirect DM detection experiments. If the MSSM explanation of the excess seen by Fermi-LAT is correct, a DM signal might be discovered soon. |
1902.04582 | Alexander Ridgway K | Alexander K. Ridgway and Mark B. Wise | An Estimate of the Inclusive Branching Ratio to ${\bar B}_c$ in
$\Xi_{bbq}$ Decay | 6 pages, 2 figures | null | 10.1016/j.physletb.2019.04.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate the branching ratio for the inclusive decays $\Xi_{bbq}
\rightarrow {\bar B}_c^{(*)}+X_{c,s,q}$ to be approximately 1%. Our estimate is
performed using non-relativistic potential quark model methods that are
appropriate if the bottom and charm quarks are heavy compared to the strong
interaction scale. Here the superscript $(*)$ denotes that we are summing over
spin zero ${\bar B}_c$ and spin one ${\bar B}_c^*$ mesons and the subscript $q$
denotes a light quark. Our approach treats the two bottom quarks in the baryon
$\Xi_{bbq}$ as a small color anti-triplet. This estimate for the inclusive
branching ratio to ${\bar B}_c$ and ${\bar B}^*_c$ mesons also holds for decays
of the lowest lying $T_{bb{\bar q}{\bar q}}$ tetraquark states, provided they
are stable against strong and electromagnetic decay.
| [
{
"created": "Tue, 12 Feb 2019 19:00:00 GMT",
"version": "v1"
}
] | 2019-04-17 | [
[
"Ridgway",
"Alexander K.",
""
],
[
"Wise",
"Mark B.",
""
]
] | We estimate the branching ratio for the inclusive decays $\Xi_{bbq} \rightarrow {\bar B}_c^{(*)}+X_{c,s,q}$ to be approximately 1%. Our estimate is performed using non-relativistic potential quark model methods that are appropriate if the bottom and charm quarks are heavy compared to the strong interaction scale. Here the superscript $(*)$ denotes that we are summing over spin zero ${\bar B}_c$ and spin one ${\bar B}_c^*$ mesons and the subscript $q$ denotes a light quark. Our approach treats the two bottom quarks in the baryon $\Xi_{bbq}$ as a small color anti-triplet. This estimate for the inclusive branching ratio to ${\bar B}_c$ and ${\bar B}^*_c$ mesons also holds for decays of the lowest lying $T_{bb{\bar q}{\bar q}}$ tetraquark states, provided they are stable against strong and electromagnetic decay. |
1810.01079 | C. Q. Geng | C.Q. Geng, Y.K. Hsiao, Chia-Wei Liu and Tien-Hsueh Tsai | Three-body charmed baryon Decays with SU(3) flavor symmetry | 14 pages, no figure, revised version accepted by PRD | Phys. Rev. D 99, 073003 (2019) | 10.1103/PhysRevD.99.073003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the three-body anti-triplet ${\bf B_c}\to {\bf B_n}MM'$ decays with
the $SU(3)$ flavor ($SU(3)_f$) symmetry, where ${\bf B_c}$ denotes the charmed
baryon anti-triplet of $(\Xi_c^0,-\Xi_c^+,\Lambda_c^+)$, and ${\bf B_n}$ and
$M(M')$ represent baryon and meson octets, respectively. By considering only
the S-wave $MM'$-pair contributions without resonance effects, the decays of
${\bf B_c}\to {\bf B_n}MM'$ can be decomposed into irreducible forms with 11
parameters under $SU(3)_f$, which are fitted by the 14 existing data, resulting
in a reasonable value of $\chi^2/d.o.f=2.8$ for the fit. Consequently, we find
that the triangle sum rule of ${\cal A}(\Lambda_c^+\to n\bar K^0 \pi^+)-{\cal
A}(\Lambda_c^+\to pK^- \pi^+)-\sqrt 2 {\cal A}(\Lambda_c^+\to p\bar K^0
\pi^0)=0$ given by the isospin symmetry holds under $SU(3)_f$, where ${\cal A}$
stands for the decay amplitude. In addition, we predict that ${\cal
B}(\Lambda_c^+\to n \pi^{+} \bar{K}^{0})=(0.9\pm 0.8)\times 10^{-2}$, which is
$3-4$ times smaller than the BESIII observation, indicating the existence of
the resonant states. For the to-be-observed ${\bf B_c}\to {\bf B_n}MM'$ decays,
we compute the branching fractions with the $SU(3)_f$ amplitudes to be compared
to the BESIII and LHCb measurements in the future.
| [
{
"created": "Tue, 2 Oct 2018 05:44:50 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2019 07:09:14 GMT",
"version": "v2"
}
] | 2019-04-17 | [
[
"Geng",
"C. Q.",
""
],
[
"Hsiao",
"Y. K.",
""
],
[
"Liu",
"Chia-Wei",
""
],
[
"Tsai",
"Tien-Hsueh",
""
]
] | We study the three-body anti-triplet ${\bf B_c}\to {\bf B_n}MM'$ decays with the $SU(3)$ flavor ($SU(3)_f$) symmetry, where ${\bf B_c}$ denotes the charmed baryon anti-triplet of $(\Xi_c^0,-\Xi_c^+,\Lambda_c^+)$, and ${\bf B_n}$ and $M(M')$ represent baryon and meson octets, respectively. By considering only the S-wave $MM'$-pair contributions without resonance effects, the decays of ${\bf B_c}\to {\bf B_n}MM'$ can be decomposed into irreducible forms with 11 parameters under $SU(3)_f$, which are fitted by the 14 existing data, resulting in a reasonable value of $\chi^2/d.o.f=2.8$ for the fit. Consequently, we find that the triangle sum rule of ${\cal A}(\Lambda_c^+\to n\bar K^0 \pi^+)-{\cal A}(\Lambda_c^+\to pK^- \pi^+)-\sqrt 2 {\cal A}(\Lambda_c^+\to p\bar K^0 \pi^0)=0$ given by the isospin symmetry holds under $SU(3)_f$, where ${\cal A}$ stands for the decay amplitude. In addition, we predict that ${\cal B}(\Lambda_c^+\to n \pi^{+} \bar{K}^{0})=(0.9\pm 0.8)\times 10^{-2}$, which is $3-4$ times smaller than the BESIII observation, indicating the existence of the resonant states. For the to-be-observed ${\bf B_c}\to {\bf B_n}MM'$ decays, we compute the branching fractions with the $SU(3)_f$ amplitudes to be compared to the BESIII and LHCb measurements in the future. |
1607.00838 | Bruno Machet | Bruno Machet | 1-loop mass generation by a constant external magnetic field for an
electron propagating in a thin medium | 26 pages, 10 figures. Version to appear in Int. J. Mod. Phys. B
(2018) | null | 10.1142/S021797921850114X | null | hep-ph cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 1-loop self-energy of a Dirac electron of mass m propagating in a thin
medium simulating graphene in an external magnetic field B is investigated in
Quantum Field Theory. Equivalence is shown with the so-called reduced QED_{3+1}
on a 2-brane. Schwinger-like methods are used to calculate the self-mass \delta
m_{LLL} of the electron when it lies in the lowest Landau level. Unlike in
standard QED_{3+1}, it does not vanish at the limit m -> 0 :\delta m_{LLL} ->
(\alpha/2)\sqrt{pi/2}sqrt{\hbar|e|B/c^2}; all Landau levels of the virtual
electron are taken into account and on mass-shell renormalization conditions
are implemented. Restricting to the sole lowest Landau level of the virtual
electron is explicitly shown to be inadequate. Resummations at higher orders
lie beyond the scope of this work.
| [
{
"created": "Mon, 4 Jul 2016 12:04:37 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2018 13:38:03 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Machet",
"Bruno",
""
]
] | The 1-loop self-energy of a Dirac electron of mass m propagating in a thin medium simulating graphene in an external magnetic field B is investigated in Quantum Field Theory. Equivalence is shown with the so-called reduced QED_{3+1} on a 2-brane. Schwinger-like methods are used to calculate the self-mass \delta m_{LLL} of the electron when it lies in the lowest Landau level. Unlike in standard QED_{3+1}, it does not vanish at the limit m -> 0 :\delta m_{LLL} -> (\alpha/2)\sqrt{pi/2}sqrt{\hbar|e|B/c^2}; all Landau levels of the virtual electron are taken into account and on mass-shell renormalization conditions are implemented. Restricting to the sole lowest Landau level of the virtual electron is explicitly shown to be inadequate. Resummations at higher orders lie beyond the scope of this work. |
hep-ph/9708327 | Adam Falk | Adam F. Falk and Michael Luke | Hadronic Spectral Moments in Semileptonic B Decays With a Lepton Energy
Cut | 13 pages, 5 figures, REVTeX | Phys.Rev.D57:424-430,1998 | 10.1103/PhysRevD.57.424 | JHU-TIPAC-97010, UTPT-97-09 | hep-ph | null | We compute the first two moments of the final hadronic invariant mass in
inclusive semileptonic B decay, in the presence of a cut on the charged lepton
energy. These moments may be measured directly by experiments at the
Upsilon(4S) using the neutrino reconstruction technique, which requires such a
cut. Measurement of these moments will place constraints on the nonperturbative
parameters \bar\Lambda and \lambda_1, which are relevant for extracting the
quark masses m_b and m_c, as well as the CKM angle V_cb. We include terms of
order \alpha_s^2\beta_0 and 1/m_b^3 in the operator product expansion, and use
the latter to estimate the theoretical uncertainty in the extraction of
\bar\Lambda and \lambda_1.
| [
{
"created": "Tue, 12 Aug 1997 18:01:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Falk",
"Adam F.",
""
],
[
"Luke",
"Michael",
""
]
] | We compute the first two moments of the final hadronic invariant mass in inclusive semileptonic B decay, in the presence of a cut on the charged lepton energy. These moments may be measured directly by experiments at the Upsilon(4S) using the neutrino reconstruction technique, which requires such a cut. Measurement of these moments will place constraints on the nonperturbative parameters \bar\Lambda and \lambda_1, which are relevant for extracting the quark masses m_b and m_c, as well as the CKM angle V_cb. We include terms of order \alpha_s^2\beta_0 and 1/m_b^3 in the operator product expansion, and use the latter to estimate the theoretical uncertainty in the extraction of \bar\Lambda and \lambda_1. |
hep-ph/9312352 | null | R. D. Peccei, Ucla | Standard Model Expectations for CP Violation | 55 pages, UCLA/93/TEP/50. Figures available upon request to
reyes@physics.ucla.edu | null | null | null | hep-ph | null | I review the predictions and expectations of the CKM model for CP violation
in both the $K^0-\bar K^0$ and $B^0-\bar B^0$ systems. A brief discussion of CP
violation in charged $K$- and $B$-decays is also included, as well as some
remarks on the electric dipole moments of the neutron and the electron.
| [
{
"created": "Thu, 30 Dec 1993 01:21:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Peccei",
"R. D.",
""
],
[
"Ucla",
"",
""
]
] | I review the predictions and expectations of the CKM model for CP violation in both the $K^0-\bar K^0$ and $B^0-\bar B^0$ systems. A brief discussion of CP violation in charged $K$- and $B$-decays is also included, as well as some remarks on the electric dipole moments of the neutron and the electron. |
hep-ph/0305213 | Kunihiko Terasaki | K. Terasaki | BABAR resonance as a new window of hadron physics | 3 pages, 0 figure | Phys.Rev.D68:011501,2003 | 10.1103/PhysRevD.68.011501 | YITP-03-28 | hep-ph | null | Possible decays of four-quark mesons are studied by assigning the newly
observed BABAR resonance to a four-quark meson with C=S=I=1. It is expected
that some of them can be observed as narrow resonances. Implication of
existence of four-quark mesons in hadronic weak interactions is also discussed.
| [
{
"created": "Tue, 20 May 2003 07:42:08 GMT",
"version": "v1"
},
{
"created": "Wed, 21 May 2003 05:20:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Terasaki",
"K.",
""
]
] | Possible decays of four-quark mesons are studied by assigning the newly observed BABAR resonance to a four-quark meson with C=S=I=1. It is expected that some of them can be observed as narrow resonances. Implication of existence of four-quark mesons in hadronic weak interactions is also discussed. |
1112.2675 | David Eby | David A. Eby and Paul H. Frampton | Nonzero theta_13 signals nonmaximal atmospheric neutrino mixing | 4 pages, 1 figure. Published version Phys. Rev. D | Phys. Rev. D86 (2012) 117304 | 10.1103/PhysRevD.86.117304 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From recent groundbreaking experiments, it is now known that the
Pontecorvo-Maki-Nakagawa-Sakata mixing differs significantly from the
tribimaximal model in which theta_13=0 and theta_23=pi/4. Flavor symmetry can
require that the departures from these two equations are linearly related. T'
and A_4, which successfully accommodated the pre-T2K
Pontecorvo-Maki-Nakagawa-Sakata matrix, predict that 38.07 deg.< theta_23
<39.52 deg. at 95% C.L.. The best fit values, combining the model predictions
with T2K, MINOS, Double Chooz, Daya Bay, and RENO data, are theta_23=38.7 deg.
and theta_13=8.9 deg..
| [
{
"created": "Mon, 12 Dec 2011 20:08:59 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Mar 2012 18:59:13 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Nov 2012 18:19:45 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Nov 2012 17:34:09 GMT",
"version": "v4"
},
{
"c... | 2013-01-17 | [
[
"Eby",
"David A.",
""
],
[
"Frampton",
"Paul H.",
""
]
] | From recent groundbreaking experiments, it is now known that the Pontecorvo-Maki-Nakagawa-Sakata mixing differs significantly from the tribimaximal model in which theta_13=0 and theta_23=pi/4. Flavor symmetry can require that the departures from these two equations are linearly related. T' and A_4, which successfully accommodated the pre-T2K Pontecorvo-Maki-Nakagawa-Sakata matrix, predict that 38.07 deg.< theta_23 <39.52 deg. at 95% C.L.. The best fit values, combining the model predictions with T2K, MINOS, Double Chooz, Daya Bay, and RENO data, are theta_23=38.7 deg. and theta_13=8.9 deg.. |
hep-ph/9509367 | Dr. M. Pluemer | U. Ornik, M. Plumer, A. Timmermann, R.W. Weiner | Pre-Equilibrium Stage and Phase Transition of Quark Matter Probed by
Photon Interferometry | 10 pages, 3 Figures in uuencoded Postscript | null | null | null | hep-ph | null | We study single- and double-inclusive spectra of thermal photons, produced in
heavy-ion collisions at $\sqrt{s}=200$ AGeV within a realistic space-time
framework which combines the Parton-Cascade-Model and 3-dimensional
hydrodynamics (HYLANDER). This allows also for the first time to take into
account pre-equilibrium effects for photon production. A rapid decrease in the
width of the correlation function as the photon transverse momentum drops below
$\sim 1.5$ GeV is a signature of the deconfinement phase transition.
| [
{
"created": "Fri, 22 Sep 1995 14:00:44 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 1995 11:39:42 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Ornik",
"U.",
""
],
[
"Plumer",
"M.",
""
],
[
"Timmermann",
"A.",
""
],
[
"Weiner",
"R. W.",
""
]
] | We study single- and double-inclusive spectra of thermal photons, produced in heavy-ion collisions at $\sqrt{s}=200$ AGeV within a realistic space-time framework which combines the Parton-Cascade-Model and 3-dimensional hydrodynamics (HYLANDER). This allows also for the first time to take into account pre-equilibrium effects for photon production. A rapid decrease in the width of the correlation function as the photon transverse momentum drops below $\sim 1.5$ GeV is a signature of the deconfinement phase transition. |
1408.4734 | Marcus Bluhm | Marcus Bluhm (NCSU, Raleigh), Paolo Alba, Wanda Alberico (INFN, Turin
& Turin U.), Rene Bellwied (Houston U.), Valentina Mantovani Sarti (INFN,
Turin & Turin U.), Marlene Nahrgang (Duke U.), Claudia Ratti (INFN, Turin &
Turin U.) | Determination of freeze-out conditions from fluctuation observables
measured at RHIC | Proceedings of the 24th Quark Matter conference, 19-24 May 2014,
Darmstadt, Germany. 4 pp | null | 10.1016/j.nuclphysa.2014.08.016 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extract chemical freeze-out conditions via a thermal model approach from
fluctuation observables measured at RHIC and compare with results from lattice
QCD and statistical hadronization model fits. The possible influence of
additional critical and non-critical fluctuation sources not accounted for in
our analysis is discussed.
| [
{
"created": "Wed, 20 Aug 2014 17:22:15 GMT",
"version": "v1"
}
] | 2014-08-21 | [
[
"Bluhm",
"Marcus",
"",
"NCSU, Raleigh"
],
[
"Alba",
"Paolo",
"",
"INFN, Turin\n & Turin U."
],
[
"Alberico",
"Wanda",
"",
"INFN, Turin\n & Turin U."
],
[
"Bellwied",
"Rene",
"",
"Houston U."
],
[
"Sarti",
"Valentina Mantovan... | We extract chemical freeze-out conditions via a thermal model approach from fluctuation observables measured at RHIC and compare with results from lattice QCD and statistical hadronization model fits. The possible influence of additional critical and non-critical fluctuation sources not accounted for in our analysis is discussed. |
1406.6978 | Valentina De Romeri | A. Abada, V. De Romeri and A.M. Teixeira | Effect of steriles states on lepton magnetic moments and neutrinoless
double beta decay | 25 pages, 19 figures | null | 10.1007/JHEP09(2014)074 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the impact of sterile fermion states on the anomalous magnetic
moment of charged leptons, as well as their contribution to neutrinoless double
beta decays. We illustrate our results in a minimal, effective extension of the
Standard Model by one sterile fermion state, and in a well-motivated framework
of neutrino mass generation, embedding the Inverse Seesaw into the Standard
Model. The simple "3+1" effective case succeeds in alleviating the tension
related to the muon anomalous magnetic moment, albeit only at the 3$\sigma$
level, and for light sterile states (corresponding to a }cosmologically
disfavoured regime). Interestingly, our analysis shows that a future $0 \nu 2
\beta$ observation does not necessarily imply an inverted hierarchy for the
active neutrinos in this simple extension. Although the Inverse Seesaw
realisation here addressed could indeed ease the tension in $(g-2)_\mu$, bounds
from lepton universality in kaon decays mostly preclude this from happening.
However, these scenarios can also have a strong impact on the interpretation of
a future $0 \nu 2 \beta$ signal regarding the hierarchy of the active neutrino
mass spectrum.
| [
{
"created": "Thu, 26 Jun 2014 18:50:07 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Abada",
"A.",
""
],
[
"De Romeri",
"V.",
""
],
[
"Teixeira",
"A. M.",
""
]
] | We address the impact of sterile fermion states on the anomalous magnetic moment of charged leptons, as well as their contribution to neutrinoless double beta decays. We illustrate our results in a minimal, effective extension of the Standard Model by one sterile fermion state, and in a well-motivated framework of neutrino mass generation, embedding the Inverse Seesaw into the Standard Model. The simple "3+1" effective case succeeds in alleviating the tension related to the muon anomalous magnetic moment, albeit only at the 3$\sigma$ level, and for light sterile states (corresponding to a }cosmologically disfavoured regime). Interestingly, our analysis shows that a future $0 \nu 2 \beta$ observation does not necessarily imply an inverted hierarchy for the active neutrinos in this simple extension. Although the Inverse Seesaw realisation here addressed could indeed ease the tension in $(g-2)_\mu$, bounds from lepton universality in kaon decays mostly preclude this from happening. However, these scenarios can also have a strong impact on the interpretation of a future $0 \nu 2 \beta$ signal regarding the hierarchy of the active neutrino mass spectrum. |
2007.06851 | Urs Wiedemann A | Aleksi Kurkela, Seyed Farid Taghavi, Urs Achim Wiedemann and Bin Wu | Hydrodynamization in systems with detailed transverse profiles | null | null | 10.1016/j.physletb.2020.135901 | CERN-TH-2020-118 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of fluid-like behavior in nucleus-nucleus, proton-nucleus and
high-multiplicity proton-proton collisions motivates systematic studies of how
different measurements approach their fluid-dynamic limit. We have developed
numerical methods to solve the ultra-relativistic Boltzmann equation for
systems of arbitrary size and transverse geometry. Here, we apply these
techniques for the first time to the study of azimuthal flow coefficients $v_n$
including non-linear mode-mode coupling and to an initial condition with
realistic event-by-event fluctuations. We show how both linear and non-linear
response coefficients extracted from $v_n$ develop as a function of opacity
from free streaming to perfect fluidity. We note in particular that away from
the fluid-dynamic limit, the signal strength of linear and non-linear response
coefficients does not reduce uniformly, but that their hierarchy and relative
size shows characteristic differences.
| [
{
"created": "Tue, 14 Jul 2020 07:01:14 GMT",
"version": "v1"
}
] | 2020-11-11 | [
[
"Kurkela",
"Aleksi",
""
],
[
"Taghavi",
"Seyed Farid",
""
],
[
"Wiedemann",
"Urs Achim",
""
],
[
"Wu",
"Bin",
""
]
] | The observation of fluid-like behavior in nucleus-nucleus, proton-nucleus and high-multiplicity proton-proton collisions motivates systematic studies of how different measurements approach their fluid-dynamic limit. We have developed numerical methods to solve the ultra-relativistic Boltzmann equation for systems of arbitrary size and transverse geometry. Here, we apply these techniques for the first time to the study of azimuthal flow coefficients $v_n$ including non-linear mode-mode coupling and to an initial condition with realistic event-by-event fluctuations. We show how both linear and non-linear response coefficients extracted from $v_n$ develop as a function of opacity from free streaming to perfect fluidity. We note in particular that away from the fluid-dynamic limit, the signal strength of linear and non-linear response coefficients does not reduce uniformly, but that their hierarchy and relative size shows characteristic differences. |
1606.05326 | Ezequiel Alvarez | Ezequiel Alvarez (ICAS, Argentina), Leandro Da Rold (CAB, Argentina),
Javier Mazzitelli (ICAS, Argentina) and Alejandro Szynkman (UNLP, Argentina) | A 750 GeV graviton and the Higgs as a pNGB | 24 pages, 12 figures | null | null | ICAS 014/16 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the diphoton excess at 750 GeV reported by ATLAS and CMS, by
assuming that it corresponds to a new spin-two resonant state. We model this
state as a massive graviton in a two-site model. We show that the very
stringent bounds from $VV$ final states can be evaded naturally by considering
that the Higgs is a pseudo Nambu-Goldstone boson. In this case the couplings of
the graviton to the longitudinal electroweak gauge bosons can be parametrically
suppressed. On the other hand, partial compositeness allows to suppress the
leptonic channels. We compute loop-induced contributions to the graviton
couplings by the presence of the SM third generation of quarks and composite
partners of the SM fermions and obtain that they are not important. We find
that the diphoton signal and the experimental constraints from other decay
channels can be reproduced in a large and natural region of the parameter space
of the theory.
| [
{
"created": "Thu, 16 Jun 2016 19:38:27 GMT",
"version": "v1"
}
] | 2016-06-17 | [
[
"Alvarez",
"Ezequiel",
"",
"ICAS, Argentina"
],
[
"Da Rold",
"Leandro",
"",
"CAB, Argentina"
],
[
"Mazzitelli",
"Javier",
"",
"ICAS, Argentina"
],
[
"Szynkman",
"Alejandro",
"",
"UNLP, Argentina"
]
] | We study the diphoton excess at 750 GeV reported by ATLAS and CMS, by assuming that it corresponds to a new spin-two resonant state. We model this state as a massive graviton in a two-site model. We show that the very stringent bounds from $VV$ final states can be evaded naturally by considering that the Higgs is a pseudo Nambu-Goldstone boson. In this case the couplings of the graviton to the longitudinal electroweak gauge bosons can be parametrically suppressed. On the other hand, partial compositeness allows to suppress the leptonic channels. We compute loop-induced contributions to the graviton couplings by the presence of the SM third generation of quarks and composite partners of the SM fermions and obtain that they are not important. We find that the diphoton signal and the experimental constraints from other decay channels can be reproduced in a large and natural region of the parameter space of the theory. |
1612.01969 | Roman Pasechnik | Eduardo Basso, Claude Bourrely, Roman Pasechnik and Jacques Soffer | The landscape of $W^{\pm}$ and $Z$ bosons produced in $pp$ collisions up
to LHC energies | 16 pages, 8 figures; discussion extended, typos fixed; published
version | null | 10.1016/j.nuclphysa.2017.06.035 | LU TP 16-63 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a selection of recent experimental results on electroweak
$W^{\pm},\,Z$ gauge boson production in $pp$ collisions at BNL RHIC and CERN
LHC energies in comparison to prediction of perturbative QCD calculations based
on different sets of NLO parton distribution functions including the
statistical PDF model known from fits to the DIS data. We show that the current
statistical PDF parameterisation (fitted to the DIS data only) underestimates
the LHC data on $W^{\pm},\,Z$ gauge boson production cross sections at the NLO
by about 20\%. This suggests that there is a need to refit the parameters of
the statistical PDF including the latest LHC data.
| [
{
"created": "Tue, 6 Dec 2016 19:58:35 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Dec 2016 22:08:17 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Jun 2017 01:21:05 GMT",
"version": "v3"
}
] | 2017-06-22 | [
[
"Basso",
"Eduardo",
""
],
[
"Bourrely",
"Claude",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Soffer",
"Jacques",
""
]
] | We consider a selection of recent experimental results on electroweak $W^{\pm},\,Z$ gauge boson production in $pp$ collisions at BNL RHIC and CERN LHC energies in comparison to prediction of perturbative QCD calculations based on different sets of NLO parton distribution functions including the statistical PDF model known from fits to the DIS data. We show that the current statistical PDF parameterisation (fitted to the DIS data only) underestimates the LHC data on $W^{\pm},\,Z$ gauge boson production cross sections at the NLO by about 20\%. This suggests that there is a need to refit the parameters of the statistical PDF including the latest LHC data. |
1911.00479 | Herschel A. Chawdhry | Herschel A. Chawdhry, Micha{\l} Czakon, Alexander Mitov and Rene
Poncelet | NNLO QCD corrections to three-photon production at the LHC | 20 pages, 6 figures. v2: published version | JHEP 2002 (2020) 057 | 10.1007/JHEP02(2020)057 | Cavendish-HEP-19/17, TTK-19-45, P3H-19-041 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the NNLO QCD corrections to three-photon production at the LHC.
This is the first NNLO QCD calculation for a $2\to 3$ process. Our calculation
is exact, except for the scale-independent part of the two-loop finite
remainder which is included in the leading color approximation. We estimate the
size of the missing two-loop corrections and find them to be phenomenologically
negligible. We compare our predictions with available 8 TeV measurement from
the ATLAS collaboration. We find that the inclusion of the NNLO corrections
eliminates the existing significant discrepancy with respect to NLO QCD
predictions, paving the way for precision phenomenology in this process.
| [
{
"created": "Fri, 1 Nov 2019 17:43:35 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 2020 15:56:14 GMT",
"version": "v2"
}
] | 2020-02-27 | [
[
"Chawdhry",
"Herschel A.",
""
],
[
"Czakon",
"Michał",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Poncelet",
"Rene",
""
]
] | We compute the NNLO QCD corrections to three-photon production at the LHC. This is the first NNLO QCD calculation for a $2\to 3$ process. Our calculation is exact, except for the scale-independent part of the two-loop finite remainder which is included in the leading color approximation. We estimate the size of the missing two-loop corrections and find them to be phenomenologically negligible. We compare our predictions with available 8 TeV measurement from the ATLAS collaboration. We find that the inclusion of the NNLO corrections eliminates the existing significant discrepancy with respect to NLO QCD predictions, paving the way for precision phenomenology in this process. |
1611.05354 | Jorge de Blas Mateo | Jorge de Blas, Marco Ciuchini, Enrico Franco, Satoshi Mishima,
Maurizio Pierini, Laura Reina, Luca Silvestrini | Electroweak precision constraints at present and future colliders | 6 + 1 pages, 4 figures, 6 tables. Minor corrections. Contribution to
the Proceedings of the 38th International Conference on High Energy Physics,
3-10 August 2016, Chicago, U.S.A | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the global fit to electroweak precision observables in the
Standard Model and present model-independent bounds on several general new
physics scenarios. We present a projection of the fit based on the expected
experimental improvements at future $e^+ e^-$ colliders, and compare the
constraining power of some of the different experiments that have been
proposed. All results have been obtained with the HEPfit code.
| [
{
"created": "Wed, 16 Nov 2016 16:45:46 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Feb 2017 11:56:48 GMT",
"version": "v2"
}
] | 2017-02-28 | [
[
"de Blas",
"Jorge",
""
],
[
"Ciuchini",
"Marco",
""
],
[
"Franco",
"Enrico",
""
],
[
"Mishima",
"Satoshi",
""
],
[
"Pierini",
"Maurizio",
""
],
[
"Reina",
"Laura",
""
],
[
"Silvestrini",
"Luca",
""
]
] | We revisit the global fit to electroweak precision observables in the Standard Model and present model-independent bounds on several general new physics scenarios. We present a projection of the fit based on the expected experimental improvements at future $e^+ e^-$ colliders, and compare the constraining power of some of the different experiments that have been proposed. All results have been obtained with the HEPfit code. |
hep-ph/9907243 | David London | Ahmed Ali and David London | Precision Flavour Physics and Supersymmetry | 35 pages, 12 figures | Phys.Rept.320:79-106,1999 | 10.1016/S0370-1573(99)00075-7 | DESY 99-083, UdeM-GPP-TH-99-60 | hep-ph | null | We review the salient features of a comparative study of the profile of the
CKM unitarity triangle, and the resulting CP-violating phases $\alpha$, $\beta$
and $\gamma$ in B decays, in the standard model and in several variants of the
minimal supersymmetric standard model (MSSM), reported recently by us. These
theories are characterized by a single phase in the quark flavour mixing matrix
and give rise to well-defined contributions in the
flavour-changing-neutral-current transitions in K and B decays. We analyse the
supersymmetric contributions to the mass differences in the Bd-Bd(bar) and
Bs-Bs(bar) systems, $\Delta M_d$ and $\Delta M_s$, respectively, and to the
CP-violating quantity $|epsilon|$ in K decays. Our analysis shows that the
predicted ranges of $\beta$ in the standard model and in MSSM models are very
similar. However, precise measurements at B-factories and hadron machines may
be able to distinguish these theories in terms of the other two CP-violating
phases $\alpha$ and $\gamma$.
(Contribution to the Festschrift for L.B. Okun, to appear in a special issue
of Physics Reports, eds. V.L. Telegdi and K. Winter)
| [
{
"created": "Mon, 5 Jul 1999 19:34:21 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Ali",
"Ahmed",
""
],
[
"London",
"David",
""
]
] | We review the salient features of a comparative study of the profile of the CKM unitarity triangle, and the resulting CP-violating phases $\alpha$, $\beta$ and $\gamma$ in B decays, in the standard model and in several variants of the minimal supersymmetric standard model (MSSM), reported recently by us. These theories are characterized by a single phase in the quark flavour mixing matrix and give rise to well-defined contributions in the flavour-changing-neutral-current transitions in K and B decays. We analyse the supersymmetric contributions to the mass differences in the Bd-Bd(bar) and Bs-Bs(bar) systems, $\Delta M_d$ and $\Delta M_s$, respectively, and to the CP-violating quantity $|epsilon|$ in K decays. Our analysis shows that the predicted ranges of $\beta$ in the standard model and in MSSM models are very similar. However, precise measurements at B-factories and hadron machines may be able to distinguish these theories in terms of the other two CP-violating phases $\alpha$ and $\gamma$. (Contribution to the Festschrift for L.B. Okun, to appear in a special issue of Physics Reports, eds. V.L. Telegdi and K. Winter) |
2009.09228 | Rui Santos | Da Huang, Ant\'onio P. Morais, Rui Santos | CP Violating $hW^+W^-$ Coupling in the Standard Model and Beyond | 19 pages, 4 figures | null | 10.1007/JHEP01(2021)168 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the recent development in determining the property of the
observed Higgs boson, we explore the $CP$-violating (CPV) $- c_{\rm CPV} h
W^{+\, \mu\nu}\tilde{W}^{-}_{\mu\nu}/v$ coupling in the Standard Model (SM) and
beyond, where $W^{\pm \, \mu \nu}$ and $\tilde{W}^{\pm\,\mu\nu}$ denote the
$W$-boson field strength and its dual. To begin with, we show that the
leading-order SM contribution to this CPV vertex appears at two-loop level. By
summing over the quark flavor indices in the two loop integrals analytically,
we can estimate the order of the corresponding Wilson coefficient to be $c^{\rm
SM}_{\rm CPV} \sim {\cal O}(10^{-23})$, which is obviously too small to be
probed at the LHC and planned future colliders. Then we investigate this CPV
$hW^+ W^-$ interaction in two Beyond the Standard Model benchmark models: the
left-right model and the complex 2-Higgs doublet model (C2HDM). Unlike what
happens for the SM, the dominant contributions in both models arise at the
one-loop level, and the corresponding Wilson coefficient can be as large as of
${\cal O}(10^{-9})$ in the former model and of ${\cal O}(10^{-3})$ for the
latter. In light of such a large CPV effect in the $hW^+W^-$ coupling, we also
give the formulae for the leading one-loop contribution to the related CPV
$hZZ$ effective operator in the C2HDM. The order of magnitude of the Wilson
coefficients in the C2HDM may be within reach of the high-luminosity LHC or
planned future colliders.
| [
{
"created": "Sat, 19 Sep 2020 13:32:51 GMT",
"version": "v1"
}
] | 2021-02-24 | [
[
"Huang",
"Da",
""
],
[
"Morais",
"António P.",
""
],
[
"Santos",
"Rui",
""
]
] | Inspired by the recent development in determining the property of the observed Higgs boson, we explore the $CP$-violating (CPV) $- c_{\rm CPV} h W^{+\, \mu\nu}\tilde{W}^{-}_{\mu\nu}/v$ coupling in the Standard Model (SM) and beyond, where $W^{\pm \, \mu \nu}$ and $\tilde{W}^{\pm\,\mu\nu}$ denote the $W$-boson field strength and its dual. To begin with, we show that the leading-order SM contribution to this CPV vertex appears at two-loop level. By summing over the quark flavor indices in the two loop integrals analytically, we can estimate the order of the corresponding Wilson coefficient to be $c^{\rm SM}_{\rm CPV} \sim {\cal O}(10^{-23})$, which is obviously too small to be probed at the LHC and planned future colliders. Then we investigate this CPV $hW^+ W^-$ interaction in two Beyond the Standard Model benchmark models: the left-right model and the complex 2-Higgs doublet model (C2HDM). Unlike what happens for the SM, the dominant contributions in both models arise at the one-loop level, and the corresponding Wilson coefficient can be as large as of ${\cal O}(10^{-9})$ in the former model and of ${\cal O}(10^{-3})$ for the latter. In light of such a large CPV effect in the $hW^+W^-$ coupling, we also give the formulae for the leading one-loop contribution to the related CPV $hZZ$ effective operator in the C2HDM. The order of magnitude of the Wilson coefficients in the C2HDM may be within reach of the high-luminosity LHC or planned future colliders. |
0705.4468 | Guang-You Qin | G.Y. Qin, J. Ruppert, S. Turbide, C. Gale and S. Jeon | Nuclear Suppression of Jets and R_AA at the LHC | 2 pages, 1 figure, contributed to Workshop on Heavy Ion Collisions at
the LHC: Last Call for Predictions, Geneva, Switzerland, 14 May - 8 Jun 2007 | null | null | null | hep-ph nucl-th | null | The nuclear modification factor R_AA for charged hadron production at the LHC
is predicted from jet energy loss induced by gluon bremsstrahlung. The Arnold,
Moore, and Yaffe formalism is used, together with an ideal hydrodynamical
model.
| [
{
"created": "Wed, 30 May 2007 21:11:27 GMT",
"version": "v1"
}
] | 2007-06-13 | [
[
"Qin",
"G. Y.",
""
],
[
"Ruppert",
"J.",
""
],
[
"Turbide",
"S.",
""
],
[
"Gale",
"C.",
""
],
[
"Jeon",
"S.",
""
]
] | The nuclear modification factor R_AA for charged hadron production at the LHC is predicted from jet energy loss induced by gluon bremsstrahlung. The Arnold, Moore, and Yaffe formalism is used, together with an ideal hydrodynamical model. |
1001.4801 | Kyoungchul Kong | Kyoungchul Kong, Konstantin Matchev, Geraldine Servant | Extra Dimensions at the LHC | 33 pages, 17 figures | From `Particle Dark Matter: Observations, Models and Searches'
edited by Gianfranco Bertone. Chapter 15, pp. 306-324, Hardback ISBN
9780521763684 | null | CERN-PH-TH/2010-014 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the motivation and the phenomenology of models with either flat or
warped extra dimensions. We describe the typical mass spectrum and discovery
signatures of such models at the LHC. We also review several proposed methods
for discriminating the usual low-energy supersymmetry from a model with flat
(universal) extra dimensions. (For the official website of the book, see
http://cambridge.org/us/catalogue/catalogue.asp?isbn=9780521763684 .)
| [
{
"created": "Tue, 26 Jan 2010 21:28:58 GMT",
"version": "v1"
}
] | 2010-01-28 | [
[
"Kong",
"Kyoungchul",
""
],
[
"Matchev",
"Konstantin",
""
],
[
"Servant",
"Geraldine",
""
]
] | We discuss the motivation and the phenomenology of models with either flat or warped extra dimensions. We describe the typical mass spectrum and discovery signatures of such models at the LHC. We also review several proposed methods for discriminating the usual low-energy supersymmetry from a model with flat (universal) extra dimensions. (For the official website of the book, see http://cambridge.org/us/catalogue/catalogue.asp?isbn=9780521763684 .) |
hep-ph/0310250 | Alexander Parkhomenko | A. Ali (CERN), A.Ya. Parkhomenko (Univ. Bern) | The $\eta^\prime g^* g^{(*)}$ Vertex Function in Perturbative QCD and
$\eta^\prime$-Meson Mass Effects | 4 pages, 2 figures, use svjour.cls and svepj.clo; talk given at the
International Europhysics Conference on High-Energy Physics (HEP 2003), 17-23
July 2003, Aachen, Germany. Title changed | null | null | CERN-TH/2003-253 | hep-ph | null | The $\eta^\prime g^* g^{(*)}$ effective vertex function (EVF) is calculated
in the QCD hard-scattering approach, taking into account the
$\eta^\prime$-meson mass. We work in the approximation in which only one
non-leading Gegenbauer moment in both the quark-antiquark and gluonic
light-cone distribution amplitude for the $\eta^\prime$-meson is kept. The EVF
with one off-shell gluon is shown to have the form $F_{\eta^\prime g^* g}
(q_1^2, 0, m_{\eta^\prime}^2) = m_{\eta^\prime}^2 H(q_1^2)/(q_1^2 -
m_{\eta^\prime}^2)$, valid for $|q_1^2| > m_{\eta^\prime}^2$. An interpolating
formulae for the EVF in the space-like region of the virtuality $q_1^2$, which
satisfies the QCD-anomaly normalization for on-shell gluons and the
perturbative-QCD result for the gluon virtuality $|q_1^2| \gtrsim 2 GeV^2$, is
also presented.
| [
{
"created": "Tue, 21 Oct 2003 16:52:41 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2003 17:07:40 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ali",
"A.",
"",
"CERN"
],
[
"Parkhomenko",
"A. Ya.",
"",
"Univ. Bern"
]
] | The $\eta^\prime g^* g^{(*)}$ effective vertex function (EVF) is calculated in the QCD hard-scattering approach, taking into account the $\eta^\prime$-meson mass. We work in the approximation in which only one non-leading Gegenbauer moment in both the quark-antiquark and gluonic light-cone distribution amplitude for the $\eta^\prime$-meson is kept. The EVF with one off-shell gluon is shown to have the form $F_{\eta^\prime g^* g} (q_1^2, 0, m_{\eta^\prime}^2) = m_{\eta^\prime}^2 H(q_1^2)/(q_1^2 - m_{\eta^\prime}^2)$, valid for $|q_1^2| > m_{\eta^\prime}^2$. An interpolating formulae for the EVF in the space-like region of the virtuality $q_1^2$, which satisfies the QCD-anomaly normalization for on-shell gluons and the perturbative-QCD result for the gluon virtuality $|q_1^2| \gtrsim 2 GeV^2$, is also presented. |
1507.01395 | Arghya Choudhury | Manimala Chakraborti, Utpal Chattopadhyay, Arghya Choudhury, Amitava
Datta, Sujoy Poddar | Reduced LHC constraints for higgsino-like heavier electroweakinos | 55 pages, 13 figures, 10 tables. Version published in JHEP | JHEP 11 (2015) 050 | 10.1007/JHEP11(2015)050 | HRI-RECAPP-2015-014 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a sequel to our earlier work on wino-dominated $\tilde \chi_1^{\pm}$ and
$\tilde \chi_2^{0}$ (wino models), we focus on the pMSSM models where $\tilde
\chi_1^{\pm}$ and $\tilde \chi_{2,3}^{0}$ are either higgsino dominated
(higgsino models) or admixtures of significant amount of higgsino and wino
components (mixed models), with or without light sleptons. The LHC constraints
in the trilepton channel are significantly weaker even in the presence of light
sleptons, especially in the higgsino models, compared to those mostly studied
by the LHC collaborations with wino-dominated $\tilde \chi_1^{\pm}$ and $\tilde
\chi_2^{0}$. The modes $\tilde \chi_{2,3}^{0}\rightarrow h~\tilde\chi_1^{0}$
with large branching ratios (BRs) are more common in the higgsino models and
may produce spectacular signal in the LHC Run-II. In a variety of higgsino and
mixed models we have delineated the allowed parameter space due to the LHC
constraints, the observed Dark Matter (DM) relic density of the universe, which
gets contributions from many novel DM producing mechanisms i.e., the
annihilation/coannihilation processes that lead to the correct range of relic
density, and the precise measurement of the anomalous magnetic moment of the
muon. In the higgsino models many new DM producing mechanisms, which are not
allowed in the wino models, open up. We have also explored the prospects of
direct and indirect detection of DM in the context of the LUX and IceCube
experiments respectively. In an extended model having only light gluinos in
addition to the electroweak sparticles, the gluinos decay into final states
with multiple taggable b-jets with very large BRs. As a consequence, the
existing ATLAS data in the $0l$ + jets (3b) + $E\!\!\!\!/_T$ channel provide
the best limit on $m_{\tilde g}$ ($\approx$ 1.3 TeV). Several novel signatures
of higgsino models for LHC Run-II and ILC have been identified.
| [
{
"created": "Mon, 6 Jul 2015 11:24:03 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2015 15:04:26 GMT",
"version": "v2"
}
] | 2015-11-19 | [
[
"Chakraborti",
"Manimala",
""
],
[
"Chattopadhyay",
"Utpal",
""
],
[
"Choudhury",
"Arghya",
""
],
[
"Datta",
"Amitava",
""
],
[
"Poddar",
"Sujoy",
""
]
] | As a sequel to our earlier work on wino-dominated $\tilde \chi_1^{\pm}$ and $\tilde \chi_2^{0}$ (wino models), we focus on the pMSSM models where $\tilde \chi_1^{\pm}$ and $\tilde \chi_{2,3}^{0}$ are either higgsino dominated (higgsino models) or admixtures of significant amount of higgsino and wino components (mixed models), with or without light sleptons. The LHC constraints in the trilepton channel are significantly weaker even in the presence of light sleptons, especially in the higgsino models, compared to those mostly studied by the LHC collaborations with wino-dominated $\tilde \chi_1^{\pm}$ and $\tilde \chi_2^{0}$. The modes $\tilde \chi_{2,3}^{0}\rightarrow h~\tilde\chi_1^{0}$ with large branching ratios (BRs) are more common in the higgsino models and may produce spectacular signal in the LHC Run-II. In a variety of higgsino and mixed models we have delineated the allowed parameter space due to the LHC constraints, the observed Dark Matter (DM) relic density of the universe, which gets contributions from many novel DM producing mechanisms i.e., the annihilation/coannihilation processes that lead to the correct range of relic density, and the precise measurement of the anomalous magnetic moment of the muon. In the higgsino models many new DM producing mechanisms, which are not allowed in the wino models, open up. We have also explored the prospects of direct and indirect detection of DM in the context of the LUX and IceCube experiments respectively. In an extended model having only light gluinos in addition to the electroweak sparticles, the gluinos decay into final states with multiple taggable b-jets with very large BRs. As a consequence, the existing ATLAS data in the $0l$ + jets (3b) + $E\!\!\!\!/_T$ channel provide the best limit on $m_{\tilde g}$ ($\approx$ 1.3 TeV). Several novel signatures of higgsino models for LHC Run-II and ILC have been identified. |
hep-ph/9306299 | Keh-Fei Liu | Keh-Fei Liu and Shao-Jing Dong | Origin of Difference between $\overline{d}$ and $\overline{u}$ Partons
in the Nucleon | 8 Pages, 5 ps figures included in part 2, UK/93-02 | Phys.Rev.Lett.72:1790-1793,1994 | 10.1103/PhysRevLett.72.1790 | null | hep-ph hep-lat | null | Using the Euclidean path-integral formulation for the hadronic tensor, we
show that the violation of the Gottfried sum rule does not come from the
disconnected quark-loop insertion. Rather, it comes from the connected (quark
line) insertion involving quarks propagating in the backward time direction. We
demonstrate this by studying sum rules in terms of the scalar and axial- vector
matrix elements in lattice gauge calculations. The effects of eliminating
backward time propagation are presented.
| [
{
"created": "Mon, 21 Jun 1993 19:05:27 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Liu",
"Keh-Fei",
""
],
[
"Dong",
"Shao-Jing",
""
]
] | Using the Euclidean path-integral formulation for the hadronic tensor, we show that the violation of the Gottfried sum rule does not come from the disconnected quark-loop insertion. Rather, it comes from the connected (quark line) insertion involving quarks propagating in the backward time direction. We demonstrate this by studying sum rules in terms of the scalar and axial- vector matrix elements in lattice gauge calculations. The effects of eliminating backward time propagation are presented. |
hep-ph/9508228 | Jerry Franklin | Jerrold Franklin | The spin of the nucleon in its rest system | 3 pages, Latex file with 5 uuencoded tar compressed PostScript
figures | null | null | TUHE9581 | hep-ph | null | The spin dependent structure functions, g$_{1p}$ of the proton and g$_{1n}$
of the neutron, calculated in the nucleon rest frame using a relativistic quark
model wave function, are compared with recent experiments.
| [
{
"created": "Fri, 4 Aug 1995 02:09:15 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Franklin",
"Jerrold",
""
]
] | The spin dependent structure functions, g$_{1p}$ of the proton and g$_{1n}$ of the neutron, calculated in the nucleon rest frame using a relativistic quark model wave function, are compared with recent experiments. |
1110.1857 | Alon Faraggi | Alon E. Faraggi | OPERA data and The Equivalence Postulate of Quantum Mechanics | 8 pages. Standard LaTex. References added | null | 10.1140/epjc/s10052-012-1944-y | LTH-924 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An interpretation of the recent results reported by the OPERA collaboration
is that neutrinos propagation in vacuum exceeds the speed of light. It has been
further been suggested that this interpretation can be attributed to the
variation of the particle speed arising from the Relativistic Quantum Hamilton
Jacobi Equation. I show that this is in general not the case. I derive an
expression for the quantum correction to the instantaneous relativistic
velocity in the framework of the relativistic quantum Hamilton-Jacobi equation,
which is derived from the equivalence postulate of quantum mechanics. While the
quantum correction does indicate deviations from the classical energy--momentum
relation, it does not necessarily lead to superluminal speeds. The quantum
correction found herein has a non-trivial dependence on the energy and mass of
the particle, as well as on distance travelled. I speculate on other possible
observational consequences of the equivalence postulate approach.
| [
{
"created": "Sun, 9 Oct 2011 16:58:57 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2011 08:16:21 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Faraggi",
"Alon E.",
""
]
] | An interpretation of the recent results reported by the OPERA collaboration is that neutrinos propagation in vacuum exceeds the speed of light. It has been further been suggested that this interpretation can be attributed to the variation of the particle speed arising from the Relativistic Quantum Hamilton Jacobi Equation. I show that this is in general not the case. I derive an expression for the quantum correction to the instantaneous relativistic velocity in the framework of the relativistic quantum Hamilton-Jacobi equation, which is derived from the equivalence postulate of quantum mechanics. While the quantum correction does indicate deviations from the classical energy--momentum relation, it does not necessarily lead to superluminal speeds. The quantum correction found herein has a non-trivial dependence on the energy and mass of the particle, as well as on distance travelled. I speculate on other possible observational consequences of the equivalence postulate approach. |
0704.2205 | Maurizio Piai | Maurizio Piai | Vector mesons from AdS/TC to the LHC | 24 pages, 5 figures | null | null | null | hep-ph | null | With the use of the AdS/CFT dictionary, a five-dimensional effective
description of dynamical electro-weak symmetry breaking with walking behavior
is constructed. The minimal model contains only two new parameters, the
confinement scale and the effective coupling of the new strong sector. This
parameter space is restricted by the precision electro-weak constraints and by
the requirement that the five-dimensional coupling be perturbative
(corresponding to the large-N regime in four-dimensional language). The
lightest observable new states are a set of four nearly degenerate spin-1
states with the same quantum numbers as the standard-model electro-weak gauge
bosons, and masses in the few TeV range. Their decay rate is dominated by
two-fermion final states. The number of pp -> mu mu and pp -> mu nu events is
studied as a function of the LHC integrated luminosity and of the two free
parameters. Discovery at the LHC is possible over a significant part of the
allowed parameter space up to masses of 4 TeV already with 10/fm of integrated
luminosity.
| [
{
"created": "Tue, 17 Apr 2007 17:50:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Piai",
"Maurizio",
""
]
] | With the use of the AdS/CFT dictionary, a five-dimensional effective description of dynamical electro-weak symmetry breaking with walking behavior is constructed. The minimal model contains only two new parameters, the confinement scale and the effective coupling of the new strong sector. This parameter space is restricted by the precision electro-weak constraints and by the requirement that the five-dimensional coupling be perturbative (corresponding to the large-N regime in four-dimensional language). The lightest observable new states are a set of four nearly degenerate spin-1 states with the same quantum numbers as the standard-model electro-weak gauge bosons, and masses in the few TeV range. Their decay rate is dominated by two-fermion final states. The number of pp -> mu mu and pp -> mu nu events is studied as a function of the LHC integrated luminosity and of the two free parameters. Discovery at the LHC is possible over a significant part of the allowed parameter space up to masses of 4 TeV already with 10/fm of integrated luminosity. |
hep-ph/0201016 | John McDonald | John McDonald (Liverpool) | F-Term Hybrid Inflation, the \eta-problem and Extra Dimensions | 11 pages LaTeX. Correction to review discussion. Results unchanged | JHEP 0212 (2002) 029 | 10.1088/1126-6708/2002/12/029 | null | hep-ph astro-ph | null | F-term hybrid inflation models in the context of supergravity generically
have corrections to the inflaton mass squared of the order of H^{2} (the
\eta-problem). In addition they have a problem with large deviations of the
spectrum of density perturbations from scale-invariance due to
non-renormalizable corrections to the superpotential. Here we show that an
increase of the expansion rate at large energy densities relative to that in
conventional d=4 cosmology, as suggested by the single brane Randall-Sundrum
scenario with an uncompactified extra dimension, can naturally solve the \eta
problem. This requires that the d=5 Planck mass satisfies M_{5} < 10^{16} GeV.
In addition, the scale-invariance of the density perturbation spectrum can be
generally protected from Planck-suppressed superpotential corrections if M_{5}
< 10^{10} \GeV
| [
{
"created": "Fri, 4 Jan 2002 15:25:37 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Jan 2002 14:19:06 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Jan 2002 16:34:59 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Jun 2002 22:51:23 GMT",
"version": "v4"
},
{
"cre... | 2009-11-07 | [
[
"McDonald",
"John",
"",
"Liverpool"
]
] | F-term hybrid inflation models in the context of supergravity generically have corrections to the inflaton mass squared of the order of H^{2} (the \eta-problem). In addition they have a problem with large deviations of the spectrum of density perturbations from scale-invariance due to non-renormalizable corrections to the superpotential. Here we show that an increase of the expansion rate at large energy densities relative to that in conventional d=4 cosmology, as suggested by the single brane Randall-Sundrum scenario with an uncompactified extra dimension, can naturally solve the \eta problem. This requires that the d=5 Planck mass satisfies M_{5} < 10^{16} GeV. In addition, the scale-invariance of the density perturbation spectrum can be generally protected from Planck-suppressed superpotential corrections if M_{5} < 10^{10} \GeV |
hep-ph/9912519 | Shuqian Ying | S. Ying (Fudan Univ.) | Color superconductivity and its electromagnetic manifestation | 27 pages, 7 figures in eps references added and wordings changed | null | null | FDU-23-12-99 | hep-ph hep-th nucl-th | null | A collection of the physical observables, related to the electromagnetic
properties of a nucleon, to investigate the non--perturbative quantum
fluctuations in the strong interaction vacuum state under the influence of at
least one close by (in energy density) color superconducting phase found in
several QCD motivated model calculations, are studied. It is shown that the
spontaneous breaking of the electromagnetic gauge symmetry in the color
superconducting phase of strong interaction can result in relatively clean
signals in high energy processes, especially in the semi-leptonic deep
inelastic scattering ones, due to a kind of electromagnetic induced strong
interaction. A new type of mechanism, which is a generalization of the Higgs
one, through which the local electromagnetic gauge symmetry is spontaneously
broken by a spontaneous breaking of the global baryon (nucleon) number
conservation, is revealed. A model independent assessment of the question of
how far is the color superconducting phase of the strong interaction from its
vacuum phase is made by studying currently available experimental data on the
electromagnetic responses of a nucleon at high energies. It is shown that based
on our current knowledge about a nucleon, it is quite likely that there is at
least one color superconducting phase for the strong interaction that is close
enough to the vacuum state so that its effects can even be seen in high energy
processes besides heavy ion collisions.
| [
{
"created": "Tue, 28 Dec 1999 03:41:55 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2000 12:42:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ying",
"S.",
"",
"Fudan Univ."
]
] | A collection of the physical observables, related to the electromagnetic properties of a nucleon, to investigate the non--perturbative quantum fluctuations in the strong interaction vacuum state under the influence of at least one close by (in energy density) color superconducting phase found in several QCD motivated model calculations, are studied. It is shown that the spontaneous breaking of the electromagnetic gauge symmetry in the color superconducting phase of strong interaction can result in relatively clean signals in high energy processes, especially in the semi-leptonic deep inelastic scattering ones, due to a kind of electromagnetic induced strong interaction. A new type of mechanism, which is a generalization of the Higgs one, through which the local electromagnetic gauge symmetry is spontaneously broken by a spontaneous breaking of the global baryon (nucleon) number conservation, is revealed. A model independent assessment of the question of how far is the color superconducting phase of the strong interaction from its vacuum phase is made by studying currently available experimental data on the electromagnetic responses of a nucleon at high energies. It is shown that based on our current knowledge about a nucleon, it is quite likely that there is at least one color superconducting phase for the strong interaction that is close enough to the vacuum state so that its effects can even be seen in high energy processes besides heavy ion collisions. |
hep-ph/9805386 | Teshima Tadayuki | T. Teshima and T. Sakai | Atmospheric neutrino oscillations in three-flavor neutrinos | 21 pages, LaTeX | Prog.Theor.Phys. 101 (1999) 147 | 10.1143/PTP.101.147 | CU-TP/98-05 | hep-ph | null | We analyzed the atmospheric neutrino experiments of SuperKamiokande including
zenith angle dependence's using the three-flavor neutrino framework with the
hierarchy m^2_1 \approx m^2_2<<m^2_3. Taking into account the terrestrial,
solar neutrino experimental data and the atmospheric neutrino experiments
including the sub-GeV and multi-GeV data in SuperKamiokande, large angle
solution in the solar neutrino experiments is favored and the range of the mass
parameter Deltam^2_{23} is restricted between 0.08eV^2 - 2eV^2. Allowed regions
of mixing parameters are (theta_{13}<4degree, 27degree<theta_{23}< 32degree)
for Delta m_{23}^2=1eV^2 and (theta_{13}<3degree, 28degree<theta_{23}
<33degree) for Deltam_{23}^2=0.1 eV^2.
| [
{
"created": "Wed, 20 May 1998 08:24:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Teshima",
"T.",
""
],
[
"Sakai",
"T.",
""
]
] | We analyzed the atmospheric neutrino experiments of SuperKamiokande including zenith angle dependence's using the three-flavor neutrino framework with the hierarchy m^2_1 \approx m^2_2<<m^2_3. Taking into account the terrestrial, solar neutrino experimental data and the atmospheric neutrino experiments including the sub-GeV and multi-GeV data in SuperKamiokande, large angle solution in the solar neutrino experiments is favored and the range of the mass parameter Deltam^2_{23} is restricted between 0.08eV^2 - 2eV^2. Allowed regions of mixing parameters are (theta_{13}<4degree, 27degree<theta_{23}< 32degree) for Delta m_{23}^2=1eV^2 and (theta_{13}<3degree, 28degree<theta_{23} <33degree) for Deltam_{23}^2=0.1 eV^2. |
1901.07177 | Arkadii Kozhevnikov | A.A. Kozhevnikov | Dynamical analysis of the $X$ resonance contributions to the decay
$J/\psi\to\gamma X\to\gamma\phi\phi$ | 11 pages, 8 figures | Phys. Rev. D99, 014019 (2019) | 10.1103/PhysRevD.99.014019 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of the $J^{PC}=0^{-+}$, $0^{++}$, and $2^{++}$ resonance
contributions to the decay $J/\psi\to\gamma X(J^{PC})\to\gamma\phi\phi$ is
analysed using the data obtained by BESIII collaboration. The effective
coupling constants parameterising invariant amplitudes of the transitions
$J/\psi\to\gamma X(J^{PC})$ and $X(J^{PC})\to\phi\phi$ and masses of
$X(J^{PC})$ resonances are found from the fits. They are used for evaluation of
the branching fractions $B_{X(J^{PC})\to\phi\phi}$, relative branching
fractions $B_{J/\psi\to\gamma X(J^{PC})\to\gamma\phi\phi}$, and for obtaining
the photon angular distributions.
| [
{
"created": "Tue, 22 Jan 2019 05:34:54 GMT",
"version": "v1"
}
] | 2019-01-23 | [
[
"Kozhevnikov",
"A. A.",
""
]
] | The dynamics of the $J^{PC}=0^{-+}$, $0^{++}$, and $2^{++}$ resonance contributions to the decay $J/\psi\to\gamma X(J^{PC})\to\gamma\phi\phi$ is analysed using the data obtained by BESIII collaboration. The effective coupling constants parameterising invariant amplitudes of the transitions $J/\psi\to\gamma X(J^{PC})$ and $X(J^{PC})\to\phi\phi$ and masses of $X(J^{PC})$ resonances are found from the fits. They are used for evaluation of the branching fractions $B_{X(J^{PC})\to\phi\phi}$, relative branching fractions $B_{J/\psi\to\gamma X(J^{PC})\to\gamma\phi\phi}$, and for obtaining the photon angular distributions. |
hep-ph/0701142 | G\"oran F\"aldt | G\"oran F\"aldt | Pion polarisabilities and bremsstrahlung | 21 pages | Phys.Rev.C76:014608,2007 | 10.1103/PhysRevC.76.014608 | null | hep-ph | null | A model for high-energy, small-angle pion-nucleus bremsstrahlung, $ \pi^-
+A\to\pi^- +\gamma +A$,is developed within the Glauber diffraction theory.
Special attention is focussed on the possibility of measuring the pion
polarisability in such reactions. That is the case under the Coulomb peak
provided the bremsstrahlung photon carries practically all the energy of the
incident pion. Only radiation from external legs is considered.
| [
{
"created": "Thu, 18 Jan 2007 12:44:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fäldt",
"Göran",
""
]
] | A model for high-energy, small-angle pion-nucleus bremsstrahlung, $ \pi^- +A\to\pi^- +\gamma +A$,is developed within the Glauber diffraction theory. Special attention is focussed on the possibility of measuring the pion polarisability in such reactions. That is the case under the Coulomb peak provided the bremsstrahlung photon carries practically all the energy of the incident pion. Only radiation from external legs is considered. |
1806.04376 | Yun Guo | Yun Guo, Lihua Dong, Jisi Pan and Manoel R. Moldes | Modeling the nonperturbative contributions to the complex heavy-quark
potential | final version in PRD | Phys. Rev. D 100, 036011 (2019) | 10.1103/PhysRevD.100.036011 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we construct a simple model for the complex heavy quark
potential which is defined through the Fourier transform of the static gluon
propagator. Besides the hard thermal loop resummed contribution, the gluon
propagator also includes a non-perturbative term induced by the dimension two
gluon condensate. Within the framework of thermal field theory, the real and
imaginary parts of the heavy quark potential are determined in a consistent way
without resorting to any extra assumption as long as the exact form of the
retarded/advanced gluon propagator is specified. The resulting potential model
has the desired asymptotic behaviors and reproduces the data from lattice
simulation reasonably well. By presenting a direct comparison with other
complex potential models on the market, we find the one proposed in this work
shows a significant improvement on the description of the lattice results,
especially for the imaginary part of the potential, in a temperature region
relevant to quarkonium studies.
| [
{
"created": "Tue, 12 Jun 2018 07:58:36 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2019 10:24:06 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Sep 2019 01:45:36 GMT",
"version": "v3"
}
] | 2019-09-04 | [
[
"Guo",
"Yun",
""
],
[
"Dong",
"Lihua",
""
],
[
"Pan",
"Jisi",
""
],
[
"Moldes",
"Manoel R.",
""
]
] | In this paper, we construct a simple model for the complex heavy quark potential which is defined through the Fourier transform of the static gluon propagator. Besides the hard thermal loop resummed contribution, the gluon propagator also includes a non-perturbative term induced by the dimension two gluon condensate. Within the framework of thermal field theory, the real and imaginary parts of the heavy quark potential are determined in a consistent way without resorting to any extra assumption as long as the exact form of the retarded/advanced gluon propagator is specified. The resulting potential model has the desired asymptotic behaviors and reproduces the data from lattice simulation reasonably well. By presenting a direct comparison with other complex potential models on the market, we find the one proposed in this work shows a significant improvement on the description of the lattice results, especially for the imaginary part of the potential, in a temperature region relevant to quarkonium studies. |
2107.05632 | Matthew Kelsey | Matthew Kelsey, Reynier Cruz-Torres, Xin Dong, Yuanjing Ji, Sooraj
Radhakrishnan, Ernst Sichtermann | Constraints on Gluon Distribution Functions in the Nucleon and Nucleus
from Open Charm Hadron Production at the Electron-Ion Collider | null | Phys. Rev. D 104, 054002 (2021) | 10.1103/PhysRevD.104.054002 | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | The Electron-Ion Collider (EIC) at Brookhaven National Laboratory will be a
precision Quantum Chromodynamics machine that will enable a vast physics
program with electron+proton/ion collisions across a broad center-of-mass
range. Measurements of hard probes such as heavy flavor in deep inelastic
scatterings will be an essential component to the EIC physics program and are
one of the detector R\&D driving aspects. In this paper we study the projected
statistical precision of open charm hadron production through exclusive
hadronic channel reconstruction with a silicon detector concept currently being
developed using a PYTHIA-based simulation. We further study the impact of
possible intrinsic charm in the proton on projected data, and estimate the
constraint on the nuclear gluon parton distribution function (PDF) from the
charm structure functions $F_{2}^{c\overline{c}}$ in $e$+Au collisions using a
Bayesian PDF re-weighting technique. Our studies show the EIC will be capable
delivering an unprecedented measurement of charm hadron production across a
broad kinematic region and will provide strong constraints to both intrinsic
charm and nuclear gluon PDFs.
| [
{
"created": "Sun, 11 Jul 2021 16:40:37 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Aug 2021 17:42:23 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Oct 2021 17:46:41 GMT",
"version": "v3"
}
] | 2021-10-13 | [
[
"Kelsey",
"Matthew",
""
],
[
"Cruz-Torres",
"Reynier",
""
],
[
"Dong",
"Xin",
""
],
[
"Ji",
"Yuanjing",
""
],
[
"Radhakrishnan",
"Sooraj",
""
],
[
"Sichtermann",
"Ernst",
""
]
] | The Electron-Ion Collider (EIC) at Brookhaven National Laboratory will be a precision Quantum Chromodynamics machine that will enable a vast physics program with electron+proton/ion collisions across a broad center-of-mass range. Measurements of hard probes such as heavy flavor in deep inelastic scatterings will be an essential component to the EIC physics program and are one of the detector R\&D driving aspects. In this paper we study the projected statistical precision of open charm hadron production through exclusive hadronic channel reconstruction with a silicon detector concept currently being developed using a PYTHIA-based simulation. We further study the impact of possible intrinsic charm in the proton on projected data, and estimate the constraint on the nuclear gluon parton distribution function (PDF) from the charm structure functions $F_{2}^{c\overline{c}}$ in $e$+Au collisions using a Bayesian PDF re-weighting technique. Our studies show the EIC will be capable delivering an unprecedented measurement of charm hadron production across a broad kinematic region and will provide strong constraints to both intrinsic charm and nuclear gluon PDFs. |
hep-ph/9703332 | Manuel Drees | Manuel Drees (APCTP, Seoul, Korea) | Are the H1 and ZEUS "High Q^2 Anomalies" Compatible with Each Other? | 5 pages, 1 figure; LaTeX with equation.sty and epsf.sty. Replaced to
fix typo in eq.(8c) | Phys.Lett. B403 (1997) 353-356 | 10.1016/S0370-2693(97)00525-X | APCTP 97-03 | hep-ph | null | Both ZEUS and H1 have recently reported an excess of events at high $Q^2$ and
high Bjorken--$x$. However, the $x$ distributions differ considerably;
moreover, H1 sees more events with lower luminosity. Taken separately, the $x$
distributions and the number of observed events are consistent between the two
experiments at the few percent level. However, when combined it becomes clear
that the results of H1 and ZEUS are as (in)compatible with each other as each
is with the Standard Model.
| [
{
"created": "Sat, 15 Mar 1997 05:49:30 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Mar 1997 02:33:25 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Drees",
"Manuel",
"",
"APCTP, Seoul, Korea"
]
] | Both ZEUS and H1 have recently reported an excess of events at high $Q^2$ and high Bjorken--$x$. However, the $x$ distributions differ considerably; moreover, H1 sees more events with lower luminosity. Taken separately, the $x$ distributions and the number of observed events are consistent between the two experiments at the few percent level. However, when combined it becomes clear that the results of H1 and ZEUS are as (in)compatible with each other as each is with the Standard Model. |
1405.3701 | Andreas Crivellin | Andreas Crivellin | Overview of flavour physics with focus on the MSSM and 2HDMs | 4 pages, 2 figures, contributions to the proceedings of "XLIXth
Rencontres de Moriond, QCD and High Energy Interactions" ". arXiv admin note:
substantial text overlap with arXiv:1405.2838 | null | null | CERN-PH-TH-2014-090 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these proceedings we give a concise review of some selected
flavour-violation processes and their implications for two-Higgs-doublet models
(2HDMs) and the MSSM. The processes under investigation are $\Delta F=2$
processes, $B_s\to\mu^+\mu^-$, $b\to s\gamma$, and tauonic $B$ decays. For each
process we show the impact on the models.
| [
{
"created": "Wed, 14 May 2014 21:53:19 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2014 11:24:58 GMT",
"version": "v2"
}
] | 2014-06-05 | [
[
"Crivellin",
"Andreas",
""
]
] | In these proceedings we give a concise review of some selected flavour-violation processes and their implications for two-Higgs-doublet models (2HDMs) and the MSSM. The processes under investigation are $\Delta F=2$ processes, $B_s\to\mu^+\mu^-$, $b\to s\gamma$, and tauonic $B$ decays. For each process we show the impact on the models. |
0707.0253 | Nikolai Zotov | S.P. Baranov (Lebedev Institute of Physics), N.P. Zotov (SINP, Moscow
State University) | Upsilonium polarization as a touchstone in understanding the proton
dynamics in QCD | 8 pages, 2 figures | JETP Lett.86:435-438,2007 | 10.1134/S0021364007190010 | null | hep-ph | null | In the framework of the k_t-factorization approach, the production of
$\Upsilon mesons at the Fermilab Tevatron and CERN LHC is considered, and the
predictions on the spin alignment parameter $\alpha$ are presented. We argue
that measuring the polarization of quarkonium states can serve as a crucial
test discriminating two competing theoretical approaches to parton dynamics in
QCD.
| [
{
"created": "Mon, 2 Jul 2007 15:22:15 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2007 13:02:39 GMT",
"version": "v2"
}
] | 2009-02-18 | [
[
"Baranov",
"S. P.",
"",
"Lebedev Institute of Physics"
],
[
"Zotov",
"N. P.",
"",
"SINP, Moscow\n State University"
]
] | In the framework of the k_t-factorization approach, the production of $\Upsilon mesons at the Fermilab Tevatron and CERN LHC is considered, and the predictions on the spin alignment parameter $\alpha$ are presented. We argue that measuring the polarization of quarkonium states can serve as a crucial test discriminating two competing theoretical approaches to parton dynamics in QCD. |
1601.01658 | P. S. Bhupal Dev | P. S. Bhupal Dev, Alejandro Ibarra | Heavy Neutrinos at Future Colliders | 8 pages, 1 figure; prepared for the proceedings of the LFC15
Workshop, Trento, Italy (September 7-11, 2015) | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the current status and future prospects of heavy neutrino searches
at the energy frontier, which might play an important role in vindicating the
simplest seesaw paradigm as the new physics responsible for neutrino mass
generation. After summarizing the current search limits and potential
improvements at hadron colliders, we highlight the unparalleled sensitivities
achievable in the clean environment of future lepton colliders.
| [
{
"created": "Thu, 7 Jan 2016 20:24:23 GMT",
"version": "v1"
}
] | 2016-01-08 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Ibarra",
"Alejandro",
""
]
] | We discuss the current status and future prospects of heavy neutrino searches at the energy frontier, which might play an important role in vindicating the simplest seesaw paradigm as the new physics responsible for neutrino mass generation. After summarizing the current search limits and potential improvements at hadron colliders, we highlight the unparalleled sensitivities achievable in the clean environment of future lepton colliders. |
1801.06927 | Chien-Thang Tran | Chien-Thang Tran, Mikhail A. Ivanov, J\"urgen G. K\"orner, Pietro
Santorelli | Implications of new physics in the decays $B_c \to
(J/\psi,\eta_c)\tau\nu$ | 23 pages, 10 figures, 3 tables, References updated, a version to
appear in Phys. Rev. D | Phys. Rev. D 97, 054014 (2018) | 10.1103/PhysRevD.97.054014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the semileptonic decays of the $B_c$ meson into final charmonium
states within the standard model and beyond. The relevant hadronic transition
form factors are calculated in the framework of the covariant confined quark
model developed by us. We focus on the tau mode of these decays, which may
provide some hints of new physics effects. We extend the standard model by
assuming a general effective Hamiltonian describing the $b\to c\tau\nu$
transition, which consists of the full set of the four-fermion operators. We
then obtain experimental constraints on the Wilson coefficients corresponding
to each operator and provide predictions for the branching fractions and other
polarization observables in different new physics scenarios.
| [
{
"created": "Mon, 22 Jan 2018 01:16:04 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2018 13:55:46 GMT",
"version": "v2"
}
] | 2018-03-21 | [
[
"Tran",
"Chien-Thang",
""
],
[
"Ivanov",
"Mikhail A.",
""
],
[
"Körner",
"Jürgen G.",
""
],
[
"Santorelli",
"Pietro",
""
]
] | We study the semileptonic decays of the $B_c$ meson into final charmonium states within the standard model and beyond. The relevant hadronic transition form factors are calculated in the framework of the covariant confined quark model developed by us. We focus on the tau mode of these decays, which may provide some hints of new physics effects. We extend the standard model by assuming a general effective Hamiltonian describing the $b\to c\tau\nu$ transition, which consists of the full set of the four-fermion operators. We then obtain experimental constraints on the Wilson coefficients corresponding to each operator and provide predictions for the branching fractions and other polarization observables in different new physics scenarios. |
1607.03829 | Michael E. Peskin | Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow,
Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim
Perelstein, Roman Poeschl, Juergen Reuter, Frank Simon, Tomohiko Tanabe,
Jaehoon Yu, James D. Wells, Adam Falkowski, Shigeki Matsumoto, Takeo Moroi,
Francois Richard, Junping Tian, Marcel Vos, Hiroshi Yokoya, Hitoshi Murayama,
Hitoshi Yamamoto (LCC Physics Working Group) | Implications of the 750 GeV gamma-gamma Resonance as a Case Study for
the International Linear Collider | 39 pages, 5 figures, 5 tables; v2: some references added | null | null | ILC-NOTE-2016-067; DESY 16--145, IPMU16-0108, KEK Preprint 2016--9,
LAL 16--185, MPP--2016--174, SLAC--PUB--16751 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the gamma-gamma resonance at 750 GeV suggested by 2015 LHC data turns out
to be a real effect, what are the implications for the physics case and upgrade
path of the International Linear Collider? Whether or not the resonance is
confirmed, this question provides an interesting case study testing the
robustness of the ILC physics case. In this note, we address this question with
two points: (1) Almost all models proposed for the new 750 GeV particle require
additional new particles with electroweak couplings. The key elements of the
500 GeV ILC physics program---precision measurements of the Higgs boson, the
top quark, and 4-fermion interactions---will powerfully discriminate among
these models. This information will be important in conjunction with new LHC
data, or alone, if the new particles accompanying the 750 GeV resonance are
beyond the mass reach of the LHC. (2) Over a longer term, the energy upgrade of
the ILC to 1 TeV already discussed in the ILC TDR will enable experiments in
gamma-gamma and e+e- collisions to directly produce and study the 750 GeV
particle from these unique initial states.
| [
{
"created": "Wed, 13 Jul 2016 17:17:36 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Jul 2016 23:49:17 GMT",
"version": "v2"
}
] | 2016-08-02 | [
[
"Fujii",
"Keisuke",
"",
"LCC Physics Working Group"
],
[
"Grojean",
"Christophe",
"",
"LCC Physics Working Group"
],
[
"Peskin",
"Michael E.",
"",
"LCC Physics Working Group"
],
[
"Barklow",
"Tim",
"",
"LCC Physics Working Group"
],
[... | If the gamma-gamma resonance at 750 GeV suggested by 2015 LHC data turns out to be a real effect, what are the implications for the physics case and upgrade path of the International Linear Collider? Whether or not the resonance is confirmed, this question provides an interesting case study testing the robustness of the ILC physics case. In this note, we address this question with two points: (1) Almost all models proposed for the new 750 GeV particle require additional new particles with electroweak couplings. The key elements of the 500 GeV ILC physics program---precision measurements of the Higgs boson, the top quark, and 4-fermion interactions---will powerfully discriminate among these models. This information will be important in conjunction with new LHC data, or alone, if the new particles accompanying the 750 GeV resonance are beyond the mass reach of the LHC. (2) Over a longer term, the energy upgrade of the ILC to 1 TeV already discussed in the ILC TDR will enable experiments in gamma-gamma and e+e- collisions to directly produce and study the 750 GeV particle from these unique initial states. |
1409.1588 | Jeremy Bernon | Jeremy Bernon, Beranger Dumont, Sabine Kraml | Status of Higgs couplings after Run-1 of the LHC using Lilith 1.0 | 12 pages, 4 figures | Phys. Rev. D 90, 071301 (2014) | 10.1103/PhysRevD.90.071301 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide an update of the global fits of the couplings of the 125.5 GeV
Higgs boson using all publicly available experimental results from Run-1 of the
LHC as per Summer 2014. The fits are done by means of the new public code
Lilith 1.0. We present a selection of results given in terms of signal
strengths, reduced couplings, and for the Two-Higgs-Doublet Models of Type I
and II.
| [
{
"created": "Thu, 4 Sep 2014 20:02:38 GMT",
"version": "v1"
}
] | 2014-10-22 | [
[
"Bernon",
"Jeremy",
""
],
[
"Dumont",
"Beranger",
""
],
[
"Kraml",
"Sabine",
""
]
] | We provide an update of the global fits of the couplings of the 125.5 GeV Higgs boson using all publicly available experimental results from Run-1 of the LHC as per Summer 2014. The fits are done by means of the new public code Lilith 1.0. We present a selection of results given in terms of signal strengths, reduced couplings, and for the Two-Higgs-Doublet Models of Type I and II. |
hep-ph/9412242 | Chi-Keung Chow | Chi-Keung Chow | From Tetraquark to Hexaquark: A Systematic Study of Heavy Exotics in the
Large $N_c$ Limit | 14 pages in REVTeX, no Figures | Phys.Rev.D51:6327-6331,1995 | 10.1103/PhysRevD.51.6327 | CALT-68-1964 | hep-ph | null | A systematic study of multiquark exotics with one or $N_c-1$ heavy quarks in
the large $N_c$ limit is presented. By binding a chiral soliton to a heavy
meson, either a normal $N_c$-quark baryon or an exotic $(N_c+2)$-quark baryon
is obtained. By replacing the heavy quark with $N_c-1$ heavy antiquarks, exotic
$(2N_c-2)$-quark and $2N_c$-quark mesons are obtained. When $N_c = 3$, they are
just the normal triquark baryon $Qqq$, the exotic pentaquark baryon $Q\bar
q\bar q\bar q\bar q$, tetraquark di-meson $\bar Q \bar Q qq$ and the hexaquark
di-baryon $\bar Q \bar Q \bar q \bar q\ bar q \bar q$ respectively. Their
stabilities and decays are also discussed. In particular, it is shown that the
``heavy to heavy'' semileptonic decays are described by the Isgur--Wise form
factors of the normal baryons.
| [
{
"created": "Mon, 5 Dec 1994 23:17:13 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Chow",
"Chi-Keung",
""
]
] | A systematic study of multiquark exotics with one or $N_c-1$ heavy quarks in the large $N_c$ limit is presented. By binding a chiral soliton to a heavy meson, either a normal $N_c$-quark baryon or an exotic $(N_c+2)$-quark baryon is obtained. By replacing the heavy quark with $N_c-1$ heavy antiquarks, exotic $(2N_c-2)$-quark and $2N_c$-quark mesons are obtained. When $N_c = 3$, they are just the normal triquark baryon $Qqq$, the exotic pentaquark baryon $Q\bar q\bar q\bar q\bar q$, tetraquark di-meson $\bar Q \bar Q qq$ and the hexaquark di-baryon $\bar Q \bar Q \bar q \bar q\ bar q \bar q$ respectively. Their stabilities and decays are also discussed. In particular, it is shown that the ``heavy to heavy'' semileptonic decays are described by the Isgur--Wise form factors of the normal baryons. |
2203.15710 | Emanuele Angelo Bagnaschi | E. Bagnaschi, M. Chakraborti, S. Heinemeyer, I. Saha, G. Weiglein | Interdependence of the new "MUON G-2" Result and the $W$-Boson Mass | 26 pages, 7 figures; v2: slight modification to text and note added
in relation to the recent CDF MW measurement | null | 10.1140/epjc/s10052-022-10402-0 | CERN-TH-2022-034, DESY-22-041, IFT-UAM/CSIC-22-029 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electroweak (EW) sector of the Minimal Supersymmetric extension of the
Standard Model (MSSM), assuming the lightest neutralino as Dark Matter (DM)
candidate, can account for a variety of experimental results. In particular it
can account for the discrepancy between the experimental result for the
anomalous magnetic moment of the muon, $(g-2)_{\mu}$, and its Standard Model
(SM) prediction. The new "MUON G-2" result, combined with the older BNL result
on $(g-2)_{\mu}$, yields a deviation from the SM prediction of $\Delta a_{\mu}
= (25.1 \pm 5.9) \times 10^{-10}$, corresponding to $4.2~\sigma$. Using this
updated bound, together with the other constraints, we calculate the MSSM
prediction for the mass of the $W$ boson, $M_W$. We assume contributions only
from the EW sector, with the colored sector of the MSSM taken to be heavy. We
investigate five scenarios, distinguished by the mechanisms which yield a relic
DM density in agreement with the latest Planck bounds. We find that with the
new $(g-2)_{\mu}$ result taken into account and depending on the scenario,
values up to $M_W^{\mathrm{MSSM}} \lesssim 80.376~\mathrm{GeV}$ are reached.
The largest values are obtained for wino DM and in the case of slepton
co-annihilation, where points well within the $1\,\sigma$ range of the
experimental world average of $M_W^{\mathrm{exp}} = 80.379
\pm~0.012~\mathrm{GeV}$ are reached, whereas the SM predicts a too small value
of $M_W^{\mathrm{SM}} = 80.353~\mathrm{GeV}$. We analyze the dependence of
$M_W^{\mathrm{MSSM}}$ on the relevant masses of the EW superpartners and
demonstrate that future $M_W$ measurements, e.g. at the ILC, could distinguish
between various MSSM realizations. Sizable contributions to
$M_W^{\mathrm{MSSM}}$ are associated with a relatively light
$\tilde{\chi}^0_1$, accompanied by either a light chargino or a light smuon,
setting interesting targets for future collider searches.
| [
{
"created": "Tue, 29 Mar 2022 16:13:28 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 16:11:36 GMT",
"version": "v2"
}
] | 2022-06-08 | [
[
"Bagnaschi",
"E.",
""
],
[
"Chakraborti",
"M.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Saha",
"I.",
""
],
[
"Weiglein",
"G.",
""
]
] | The electroweak (EW) sector of the Minimal Supersymmetric extension of the Standard Model (MSSM), assuming the lightest neutralino as Dark Matter (DM) candidate, can account for a variety of experimental results. In particular it can account for the discrepancy between the experimental result for the anomalous magnetic moment of the muon, $(g-2)_{\mu}$, and its Standard Model (SM) prediction. The new "MUON G-2" result, combined with the older BNL result on $(g-2)_{\mu}$, yields a deviation from the SM prediction of $\Delta a_{\mu} = (25.1 \pm 5.9) \times 10^{-10}$, corresponding to $4.2~\sigma$. Using this updated bound, together with the other constraints, we calculate the MSSM prediction for the mass of the $W$ boson, $M_W$. We assume contributions only from the EW sector, with the colored sector of the MSSM taken to be heavy. We investigate five scenarios, distinguished by the mechanisms which yield a relic DM density in agreement with the latest Planck bounds. We find that with the new $(g-2)_{\mu}$ result taken into account and depending on the scenario, values up to $M_W^{\mathrm{MSSM}} \lesssim 80.376~\mathrm{GeV}$ are reached. The largest values are obtained for wino DM and in the case of slepton co-annihilation, where points well within the $1\,\sigma$ range of the experimental world average of $M_W^{\mathrm{exp}} = 80.379 \pm~0.012~\mathrm{GeV}$ are reached, whereas the SM predicts a too small value of $M_W^{\mathrm{SM}} = 80.353~\mathrm{GeV}$. We analyze the dependence of $M_W^{\mathrm{MSSM}}$ on the relevant masses of the EW superpartners and demonstrate that future $M_W$ measurements, e.g. at the ILC, could distinguish between various MSSM realizations. Sizable contributions to $M_W^{\mathrm{MSSM}}$ are associated with a relatively light $\tilde{\chi}^0_1$, accompanied by either a light chargino or a light smuon, setting interesting targets for future collider searches. |
1002.1971 | John F. Gunion | Radovan Dermisek (U. Indiana) and John F. Gunion (U.C. Davis and CERN) | New constraints on a light CP-odd Higgs boson and related NMSSM Ideal
Higgs Scenarios | 24 pages, 25 figures, paper updated to incorporate final ALEPH limits
in Z+4\tau channel. | Phys.Rev.D81:075003,2010 | 10.1103/PhysRevD.81.075003 | CERN-PH-TH/2010-031 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent BaBar limits on $\br(\Upsilon(3S)\to \gam a\to \gam \tau^+\tau^-)$ and
$\br(\Upsilon(3S)\to \gam a\to \gam \mu^+\mu^-)$ provide increased constraints
on the $a b\anti b$ coupling of a CP-odd Higgs boson, $a$, with
$m_a<M_{\Upsilon(3S)}$. We extract these limits from the BaBar data and compare
to the limits previously obtained using other data sets, especially the
CLEO-III $\br(\Upsilon(1S)\to \gam\to\tau^+\tau^-)$ limits. Comparisons are
made to predictions in the context of "ideal"-Higgs NMSSM scenarios, in which
the lightest CP-even Higgs boson, $h_1$, can have mass below $105\gev$ (as
preferred by precision electroweak data) and yet can escape old LEP limits by
virtue of decays to a pair of the lightest CP-odd Higgs bosons, $h_1\to
a_1a_1$, with $m_{a_1}<2m_B$. Most such scenarios with $m_{a_1}<2m_\tau$ are
eliminated, but the bulk of the $m_{a_1}>7.5\gev$ scenarios, which are
theoretically the most favored, survive. We also outline the impact of the new
ALEPH LEP results in the $\epem\to Z+4\tau$ channel. For $\tan\beta\geq 3$,
only NMSSM ideal Higgs scenarios with $m_{h_1}\gsim 98\gev$ and $m_{a_1}$ close
to $2m_B $ satisfy the ALEPH limits. For $\tan\beta\lsim 2$, the ALEPH limits
are easily satisfied for the most theoretically preferred NMSSM scenarios,
which are those with $m_{a_1}$ close to $2m_B$ and $m_{h_1}\sim
90\gev-100\gev$.
| [
{
"created": "Tue, 9 Feb 2010 21:06:34 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 2010 23:10:33 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Dermisek",
"Radovan",
"",
"U. Indiana"
],
[
"Gunion",
"John F.",
"",
"U.C. Davis and CERN"
]
] | Recent BaBar limits on $\br(\Upsilon(3S)\to \gam a\to \gam \tau^+\tau^-)$ and $\br(\Upsilon(3S)\to \gam a\to \gam \mu^+\mu^-)$ provide increased constraints on the $a b\anti b$ coupling of a CP-odd Higgs boson, $a$, with $m_a<M_{\Upsilon(3S)}$. We extract these limits from the BaBar data and compare to the limits previously obtained using other data sets, especially the CLEO-III $\br(\Upsilon(1S)\to \gam\to\tau^+\tau^-)$ limits. Comparisons are made to predictions in the context of "ideal"-Higgs NMSSM scenarios, in which the lightest CP-even Higgs boson, $h_1$, can have mass below $105\gev$ (as preferred by precision electroweak data) and yet can escape old LEP limits by virtue of decays to a pair of the lightest CP-odd Higgs bosons, $h_1\to a_1a_1$, with $m_{a_1}<2m_B$. Most such scenarios with $m_{a_1}<2m_\tau$ are eliminated, but the bulk of the $m_{a_1}>7.5\gev$ scenarios, which are theoretically the most favored, survive. We also outline the impact of the new ALEPH LEP results in the $\epem\to Z+4\tau$ channel. For $\tan\beta\geq 3$, only NMSSM ideal Higgs scenarios with $m_{h_1}\gsim 98\gev$ and $m_{a_1}$ close to $2m_B $ satisfy the ALEPH limits. For $\tan\beta\lsim 2$, the ALEPH limits are easily satisfied for the most theoretically preferred NMSSM scenarios, which are those with $m_{a_1}$ close to $2m_B$ and $m_{h_1}\sim 90\gev-100\gev$. |
0804.3601 | Danny Marfatia | Vernon Barger, Danny Marfatia, Azar Mustafayev | Neutrino sector impacts SUSY dark matter | 18 pages, 7 figures, 1 table. Version to appear in PLB | Phys.Lett.B665:242-251,2008 | 10.1016/j.physletb.2008.06.010 | NSF-KITP-08-30 | hep-ph astro-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the fact that neutrinos are massive, we study the effect of
neutrino Yukawa couplings on neutralino dark matter observables within the
framework of a supersymmetric seesaw. We find that neutrino couplings
significantly affect the neutralino relic density in regions of parameter space
where soft SUSY-breaking slepton masses and/or trilinear couplings are large.
Depending on the size of the couplings, the neutralino relic density spans over
an order of magnitude in the A-funnel, focus point and stop-coannihilation
regions of mSUGRA. We also show that dark matter detection rates can be
modified by up to several orders of magnitude.
| [
{
"created": "Wed, 23 Apr 2008 17:02:17 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jun 2008 19:42:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barger",
"Vernon",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Mustafayev",
"Azar",
""
]
] | Motivated by the fact that neutrinos are massive, we study the effect of neutrino Yukawa couplings on neutralino dark matter observables within the framework of a supersymmetric seesaw. We find that neutrino couplings significantly affect the neutralino relic density in regions of parameter space where soft SUSY-breaking slepton masses and/or trilinear couplings are large. Depending on the size of the couplings, the neutralino relic density spans over an order of magnitude in the A-funnel, focus point and stop-coannihilation regions of mSUGRA. We also show that dark matter detection rates can be modified by up to several orders of magnitude. |
1510.03731 | Antoni Szczurek | Antoni Szczurek | Higgs production within $k_t$-factorization with unintegrated gluon
distributions | 6 pages, 5 figures, talk given by A. Szczurek at the European
Physical Society Conference on High Energy Physics (EPS-HEP 2015), 22--29
July 2015, Vienna, Austria | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present differential cross sections for Higgs boson and/or two-photon
production from intermediate (virtual) Higgs boson within the formalism of
$k_t$-factorization. Resulting distributions for two photons from the Higgs
boson are compared with recent ATLAS collaboration data. In contrast to a
recent calculation the leading order $g g \to H$ contribution is rather small
compared to the ATLAS experimental data ($\gamma \gamma$ transverse momentum
and rapidity distributions). We include also higher-order contribution $g g \to
H (\to \gamma \gamma) g$, $g g \to g H g$ and the contribution of the $W^+ W^-$
and $Z^0 Z^0$ exchanges. The $gg\to Hg$ mechanism gives a similar contribution
as the $gg\to H$ mechanism. We argue that there is almost no double counting
when adding $gg\to H$ and $gg\to Hg$ contributions due to different topology of
corresponding Feynman diagrams. The final sum is comparable with the ATLAS
two-photon data.
| [
{
"created": "Tue, 13 Oct 2015 15:10:34 GMT",
"version": "v1"
}
] | 2015-10-14 | [
[
"Szczurek",
"Antoni",
""
]
] | We present differential cross sections for Higgs boson and/or two-photon production from intermediate (virtual) Higgs boson within the formalism of $k_t$-factorization. Resulting distributions for two photons from the Higgs boson are compared with recent ATLAS collaboration data. In contrast to a recent calculation the leading order $g g \to H$ contribution is rather small compared to the ATLAS experimental data ($\gamma \gamma$ transverse momentum and rapidity distributions). We include also higher-order contribution $g g \to H (\to \gamma \gamma) g$, $g g \to g H g$ and the contribution of the $W^+ W^-$ and $Z^0 Z^0$ exchanges. The $gg\to Hg$ mechanism gives a similar contribution as the $gg\to H$ mechanism. We argue that there is almost no double counting when adding $gg\to H$ and $gg\to Hg$ contributions due to different topology of corresponding Feynman diagrams. The final sum is comparable with the ATLAS two-photon data. |
hep-ph/9702364 | null | U. Baur (SUNY-Buffalo), T. Han (UC-Davis), N. Kauer (UW-Madison), R.
Sobey (UC-Davis), and D. Zeppenfeld (UW-Madison) | $W\gamma\gamma$ Production at the Fermilab Tevatron Collider: Gauge
Invariance and Radiation Amplitude Zero | 37 pages,12 figures, postscript file also available via anonymous ftp
at ftp://ucdhep.ucdavis.edu/han/vvv/Wgmgm.ps | Phys.Rev. D56 (1997) 140-150 | 10.1103/PhysRevD.56.140 | UB-HET-97-01, UCD-97-02, MADPH-97-986 | hep-ph | null | The electroweak process $p\bar p \to \ell^\pm\nu\gamma\gamma$ is calculated
at tree level, including finite W width effects. In order to obtain a gauge
invariant amplitude, the imaginary parts of $WW\gamma$ triangle graphs and
$WW\gamma\gamma$ box diagrams have to be included, in addition to resumming the
imaginary contributions to the W polarization. We demonstrate the existence of
a radiation amplitude zero in $p\bar p \to W^\pm \gamma\gamma \to
\ell^\pm\nu\gamma\gamma$, and discuss how it may be observed in correlations of
the $\gamma\gamma$ and lepton rapidities at the Fermilab Tevatron.
| [
{
"created": "Tue, 18 Feb 1997 21:14:28 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Baur",
"U.",
"",
"SUNY-Buffalo"
],
[
"Han",
"T.",
"",
"UC-Davis"
],
[
"Kauer",
"N.",
"",
"UW-Madison"
],
[
"Sobey",
"R.",
"",
"UC-Davis"
],
[
"Zeppenfeld",
"D.",
"",
"UW-Madison"
]
] | The electroweak process $p\bar p \to \ell^\pm\nu\gamma\gamma$ is calculated at tree level, including finite W width effects. In order to obtain a gauge invariant amplitude, the imaginary parts of $WW\gamma$ triangle graphs and $WW\gamma\gamma$ box diagrams have to be included, in addition to resumming the imaginary contributions to the W polarization. We demonstrate the existence of a radiation amplitude zero in $p\bar p \to W^\pm \gamma\gamma \to \ell^\pm\nu\gamma\gamma$, and discuss how it may be observed in correlations of the $\gamma\gamma$ and lepton rapidities at the Fermilab Tevatron. |
1611.08166 | Alexander M\"uck | Martin Beneke, Laura Jenniches, Alexander M\"uck, Maria Ubiali | Radiative distortion of kinematic edges in cascade decays | 15 pages, 5 figures | null | 10.1016/j.physletb.2017.04.018 | TUM-HEP-1071/16, TTK-16-50, Cavendish-HEP-16/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kinematic edges of cascade decays of new particles produced in high-energy
collisions may provide important constraints on the involved particles' masses.
For the exemplary case of gluino decay $\tilde{g}\to q\bar q \tilde{\chi}$ into
a pair of quarks and a neutralino through a squark resonance, we study the
hadronic invariant mass distribution in the vicinity of the kinematic edge. We
perform a next-to-leading order calculation in the strong coupling $\alpha_s$
and the ratio of squark width and squark mass $\Gamma_\tilde{q}/m_\tilde{q}$,
based on a systematic expansion in $\Gamma_\tilde{q}/m_\tilde{q}$. The
separation into hard, collinear and soft contributions elucidates the process
dependent and universal features of distributions in the edge region,
represented by on-shell decay matrix elements, universal jet functions and a
soft function that depends on the resonance propagator and soft Wilson lines.
| [
{
"created": "Thu, 24 Nov 2016 12:40:14 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Beneke",
"Martin",
""
],
[
"Jenniches",
"Laura",
""
],
[
"Mück",
"Alexander",
""
],
[
"Ubiali",
"Maria",
""
]
] | Kinematic edges of cascade decays of new particles produced in high-energy collisions may provide important constraints on the involved particles' masses. For the exemplary case of gluino decay $\tilde{g}\to q\bar q \tilde{\chi}$ into a pair of quarks and a neutralino through a squark resonance, we study the hadronic invariant mass distribution in the vicinity of the kinematic edge. We perform a next-to-leading order calculation in the strong coupling $\alpha_s$ and the ratio of squark width and squark mass $\Gamma_\tilde{q}/m_\tilde{q}$, based on a systematic expansion in $\Gamma_\tilde{q}/m_\tilde{q}$. The separation into hard, collinear and soft contributions elucidates the process dependent and universal features of distributions in the edge region, represented by on-shell decay matrix elements, universal jet functions and a soft function that depends on the resonance propagator and soft Wilson lines. |
hep-ph/0411290 | Jerrold Franklin | Jerrold Franklin | How High is High x? | Presented at HIX 2004, Marseille July 23-26, 2004 | null | 10.1063/1.1871646 | null | hep-ph nucl-th | null | A general three quark bound state satisfying the Pauli principle, and
conserving angular momentum and isospin, is used to investigate the spin
structure of nucleons at high $x$. It is shown that, if a spin up quark
dominates as $x$$\to$1 for a spin up proton, it must be a u quark. Then both
$A_{1p}$ and $A_{1n}$, as well as the quark spin distribution $\Delta u/u$,
will approach 1 as $x$$\to$1. The spin distribution $\Delta d/d$ does not
approach 1, but is bound by the limits $-{1/3}\le\Delta d/d\le 0$ for any $x$.
The ratio {$F_{1n}/F_{1p}$ will approach 1/4} (not3/7).
| [
{
"created": "Mon, 22 Nov 2004 12:42:36 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Franklin",
"Jerrold",
""
]
] | A general three quark bound state satisfying the Pauli principle, and conserving angular momentum and isospin, is used to investigate the spin structure of nucleons at high $x$. It is shown that, if a spin up quark dominates as $x$$\to$1 for a spin up proton, it must be a u quark. Then both $A_{1p}$ and $A_{1n}$, as well as the quark spin distribution $\Delta u/u$, will approach 1 as $x$$\to$1. The spin distribution $\Delta d/d$ does not approach 1, but is bound by the limits $-{1/3}\le\Delta d/d\le 0$ for any $x$. The ratio {$F_{1n}/F_{1p}$ will approach 1/4} (not3/7). |
1912.08882 | Sebastian Jaskiewicz | Sebastian Jaskiewicz | Next-to-leading power threshold factorization for Drell-Yan production | 12 pages, contribution to the proceedings of the 14th International
Symposium on Radiative Corrections (RADCOR2019), 9-13 September 2019,
Avignon, France. Based on arXiv: 1912.01585 | null | null | TUM-HEP-1246/19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the next-to-leading power (NLP) factorization formula for the
$q\bar{q}\to \gamma^*+X$ channel of the Drell-Yan production near the kinematic
threshold limit. The formalism used for the computation of next-to-leading
power corrections within soft-collinear effective field theory is introduced,
we discuss the emergence of new objects, the NLP collinear functions, and
define them through an operator matching equation. We review the leading power
factorization before extending it to subleading powers. We also present the
one-loop result for the newly introduced collinear function, and demonstrate
explicitly conceptual issues in performing next-to-leading logarithmic
resummation at next-to-leading power.
| [
{
"created": "Wed, 18 Dec 2019 20:47:39 GMT",
"version": "v1"
}
] | 2019-12-20 | [
[
"Jaskiewicz",
"Sebastian",
""
]
] | We present the next-to-leading power (NLP) factorization formula for the $q\bar{q}\to \gamma^*+X$ channel of the Drell-Yan production near the kinematic threshold limit. The formalism used for the computation of next-to-leading power corrections within soft-collinear effective field theory is introduced, we discuss the emergence of new objects, the NLP collinear functions, and define them through an operator matching equation. We review the leading power factorization before extending it to subleading powers. We also present the one-loop result for the newly introduced collinear function, and demonstrate explicitly conceptual issues in performing next-to-leading logarithmic resummation at next-to-leading power. |
1012.4094 | Vasiliki Mitsou | Nick E. Mavromatos, Vasiliki A. Mitsou, Sarben Sarkar and Ariadne
Vergou | Implications of a Stochastic Microscopic Finsler Cosmology | 44 pages, 5 figures. Amended version including detailed discussion on
effects of D-particle foam on Universe expansion, and on production of
D-particles at colliders (LHC). No change in conclusions. Version to appear
in EPJC | Eur. Phys. J. C72 (2012) 1956 | 10.1140/epjc/s10052-012-1956-7 | CERN-PH-TH/2010-284; KCL-PH-TH/2010-27; IFIC/10-48 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the context of supersymmetric space-time (D-particle) foam in
string/brane-theory, we discuss a Finsler-induced Cosmology and its
implications for (thermal) Dark Matter abundances. This constitutes a truly
microscopic model of dynamical space-time, where Finsler geometries arise
naturally. The D-particle foam model involves point-like brane defects
(D-particles), which provide the topologically non-trivial foamy structures of
space-time. The D-particles can capture and emit stringy matter and this leads
to a recoil of D-particles. It is indicated how one effect of such a recoil of
D-particles is a back-reaction on the space-time metric of Finsler type which
is stochastic. We show that such a type of stochastic space-time foam can lead
to acceptable cosmologies at late epochs of the Universe, due to the
non-trivial properties of the supersymmetric (BPS like) D-particle defects,
which are such so as not to affect significantly the Hubble expansion. The
restrictions placed on the free parameters of the Finsler type metric are
obtained from solving the Boltzmann equation in this background for relic
abundances of a Lightest Supersymmetric Particle (LSP) dark matter candidate.
It is demonstrated that the D-foam acts as a source for particle production in
the Boltzmann equation, thereby leading to enhanced thermal LSP relic
abundances relative to those in the Standard LambdaCDM Cosmology. For
D-particle masses of order TeV, such effects may be relevant for dark matter
searches at colliders. The latter constraints complement those coming from high
energy gamma-ray astronomy on the induced vacuum refractive index that D-foam
models entail. We also comment briefly on the production mechanisms of such
TeV-mass stringy defects at colliders, which, in view of the current LHC
experimental searches, will impose further constraints on their couplings.
| [
{
"created": "Sat, 18 Dec 2010 14:53:06 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Mar 2012 09:20:18 GMT",
"version": "v2"
}
] | 2012-04-03 | [
[
"Mavromatos",
"Nick E.",
""
],
[
"Mitsou",
"Vasiliki A.",
""
],
[
"Sarkar",
"Sarben",
""
],
[
"Vergou",
"Ariadne",
""
]
] | Within the context of supersymmetric space-time (D-particle) foam in string/brane-theory, we discuss a Finsler-induced Cosmology and its implications for (thermal) Dark Matter abundances. This constitutes a truly microscopic model of dynamical space-time, where Finsler geometries arise naturally. The D-particle foam model involves point-like brane defects (D-particles), which provide the topologically non-trivial foamy structures of space-time. The D-particles can capture and emit stringy matter and this leads to a recoil of D-particles. It is indicated how one effect of such a recoil of D-particles is a back-reaction on the space-time metric of Finsler type which is stochastic. We show that such a type of stochastic space-time foam can lead to acceptable cosmologies at late epochs of the Universe, due to the non-trivial properties of the supersymmetric (BPS like) D-particle defects, which are such so as not to affect significantly the Hubble expansion. The restrictions placed on the free parameters of the Finsler type metric are obtained from solving the Boltzmann equation in this background for relic abundances of a Lightest Supersymmetric Particle (LSP) dark matter candidate. It is demonstrated that the D-foam acts as a source for particle production in the Boltzmann equation, thereby leading to enhanced thermal LSP relic abundances relative to those in the Standard LambdaCDM Cosmology. For D-particle masses of order TeV, such effects may be relevant for dark matter searches at colliders. The latter constraints complement those coming from high energy gamma-ray astronomy on the induced vacuum refractive index that D-foam models entail. We also comment briefly on the production mechanisms of such TeV-mass stringy defects at colliders, which, in view of the current LHC experimental searches, will impose further constraints on their couplings. |
hep-ph/9409216 | Antonio Pineda | A. Pineda and J. Soto | Heavy Quark Hadronic Lagrangian for S-wave Quarkonium | 38 pages, TeX, general rewritten version with minor changes in
physical outcomes, to appear in Phys. Rev. D | Phys.Rev. D53 (1996) 3983-3997 | 10.1103/PhysRevD.53.3983 | UB-ECM-PF-94/19 | hep-ph | null | We use Heavy Quark Effective Theory (HQET) techniques to parametrize certain
non-perturbative effects related to quantum fluctuations that put both heavy
quark and antiquark in quarkonium almost on shell.
The large off-shell momentum contributions are calculated using Coulomb type
states. The almost on-shell momentum contributions are evaluated using an
effective 'chiral' lagrangian which incorporates the relevant symmetries of the
HQET for quarks and antiquarks. The cut-off dependence of both contributions
matches perfectly. The decay constants and the matrix elements of bilinear
currents at zero recoil are calculated. The new non-perturbative contributions
from the on-shell region are parametrized by a single constant. They turn out
to be $O(\alpha^2/\Lambda_{QCD} a_{n})$, $a_{n}$ being the Bohr radius and
$\alpha$ the strong coupling constant, times the non-perturbative contribution
coming from the multipole expansion (gluon condensate). We discuss the physical
applications to $\Upsilon$, $J/\Psi$ and $B_{c}$ systems.
| [
{
"created": "Fri, 2 Sep 1994 20:39:45 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 1996 19:11:47 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Pineda",
"A.",
""
],
[
"Soto",
"J.",
""
]
] | We use Heavy Quark Effective Theory (HQET) techniques to parametrize certain non-perturbative effects related to quantum fluctuations that put both heavy quark and antiquark in quarkonium almost on shell. The large off-shell momentum contributions are calculated using Coulomb type states. The almost on-shell momentum contributions are evaluated using an effective 'chiral' lagrangian which incorporates the relevant symmetries of the HQET for quarks and antiquarks. The cut-off dependence of both contributions matches perfectly. The decay constants and the matrix elements of bilinear currents at zero recoil are calculated. The new non-perturbative contributions from the on-shell region are parametrized by a single constant. They turn out to be $O(\alpha^2/\Lambda_{QCD} a_{n})$, $a_{n}$ being the Bohr radius and $\alpha$ the strong coupling constant, times the non-perturbative contribution coming from the multipole expansion (gluon condensate). We discuss the physical applications to $\Upsilon$, $J/\Psi$ and $B_{c}$ systems. |
0709.2611 | Marco Ruggieri | Marco Ruggieri | Instabilities in two flavor quark matter | 6 pages. Talk given at QCD@Work07, Martina Franca (Italy). Some typos
corrected, one reference added | AIPConf.Proc.964:250-255,2007 | 10.1063/1.2823859 | null | hep-ph | null | I discuss briefly the instabilities of two flavor quark matter, paying
attention to the gradient instability which develops in the g2SC phase in the
Goldstone $U(1)_A$ sector.
| [
{
"created": "Mon, 17 Sep 2007 13:02:38 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Oct 2007 10:58:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ruggieri",
"Marco",
""
]
] | I discuss briefly the instabilities of two flavor quark matter, paying attention to the gradient instability which develops in the g2SC phase in the Goldstone $U(1)_A$ sector. |
hep-ph/9804246 | Gao Yanming | Wang Xin and Li Jiarong | Effective Two-loop Thermodynamic Potential with Fermions in the
real-time formalism of thermal field theory | 11 pages,4 figures | Commun.Theor.Phys. 33 (2000) 253-262 | null | HZPP-9806 | hep-ph | null | Within the real-time formalism (RTF) of thermal field theory,we apply the
hard thermal loop (HTL) resummation technique to calculating effective two-loop
thermodynamic potential in quark-gluon plasma (QGP) and its renormalization.
The result with collective effects is obtained, which is valid for an arbitrary
number of quark flavors with masses.
| [
{
"created": "Tue, 7 Apr 1998 06:48:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Xin",
"Wang",
""
],
[
"Jiarong",
"Li",
""
]
] | Within the real-time formalism (RTF) of thermal field theory,we apply the hard thermal loop (HTL) resummation technique to calculating effective two-loop thermodynamic potential in quark-gluon plasma (QGP) and its renormalization. The result with collective effects is obtained, which is valid for an arbitrary number of quark flavors with masses. |
hep-ph/0504084 | Chun-Khiang Chua | Chun-Khiang Chua, Wei-Shu Hou | Implications of Bbar to D0 h0 Decays on Bbar to D Kbar, Dbar Kbar Decays | 24 pages, 4 figures | Phys.Rev. D72 (2005) 036002 | 10.1103/PhysRevD.72.036002 | null | hep-ph | null | The recently observed color suppressed B0bar to D0 pi0, D0 eta, D0 eta', Ds+
K-and D0 K0bar decay modes all have rates larger than expected, hinting at the
presence of final state interactions. We study rescattering effects in Bbar to
D P, D Kbar and Dbar Kbar modes in the quasi-elastic approach, which is
extended to accommodate D0 eta' without using U(3) symmetry. The D0bar Kbar
modes are of interest in the determination of the unitarity angle phi3/gamma.
The updated DP data are used to extract the effective Wilson coefficients
a_1^{eff} ~ 0.92, a_2^{eff} ~ 0.22, three strong phases delta ~ 62 deg., theta
~ 24 deg., sigma ~ 127 deg., and the mixing angle tau~2 deg. The values of
delta and theta are close to our previous results. The smallness of tau implies
small mixing of D0 eta1 with other modes. Predictions for D0 K-, D+ K- and D0
K0bar agree with data. The framework applies to Bbar to Dbar Kbar decays, and
rates for D0bar K-, D- K0, Ds- pi0, Ds- eta and Ds- eta' modes are predicted.
From B- to D0bar K- and D0 K- rates, we find r_B=0.09\pm 0.02.
| [
{
"created": "Tue, 12 Apr 2005 08:46:30 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Chua",
"Chun-Khiang",
""
],
[
"Hou",
"Wei-Shu",
""
]
] | The recently observed color suppressed B0bar to D0 pi0, D0 eta, D0 eta', Ds+ K-and D0 K0bar decay modes all have rates larger than expected, hinting at the presence of final state interactions. We study rescattering effects in Bbar to D P, D Kbar and Dbar Kbar modes in the quasi-elastic approach, which is extended to accommodate D0 eta' without using U(3) symmetry. The D0bar Kbar modes are of interest in the determination of the unitarity angle phi3/gamma. The updated DP data are used to extract the effective Wilson coefficients a_1^{eff} ~ 0.92, a_2^{eff} ~ 0.22, three strong phases delta ~ 62 deg., theta ~ 24 deg., sigma ~ 127 deg., and the mixing angle tau~2 deg. The values of delta and theta are close to our previous results. The smallness of tau implies small mixing of D0 eta1 with other modes. Predictions for D0 K-, D+ K- and D0 K0bar agree with data. The framework applies to Bbar to Dbar Kbar decays, and rates for D0bar K-, D- K0, Ds- pi0, Ds- eta and Ds- eta' modes are predicted. From B- to D0bar K- and D0 K- rates, we find r_B=0.09\pm 0.02. |
hep-ph/9802297 | Wu Ning | Ning Wu | Some discussions on strong interaction | 5 pages, no figure, LaTex file | null | null | null | hep-ph | null | Using the gauge field model with massive gauge bosons, we could construct a
new model to describe the strong interaction. In this new quantum
chromodynamics(QCD) model, we will introduce two sets of gluon fields, one set
is massive and another set is massless. Correspondingly, there may exists three
sets of glueballs which have the same spin-parity but have different masses. A
possible new kind of long-range force field is also discussed in this paper.
| [
{
"created": "Wed, 11 Feb 1998 03:13:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"Ning",
""
]
] | Using the gauge field model with massive gauge bosons, we could construct a new model to describe the strong interaction. In this new quantum chromodynamics(QCD) model, we will introduce two sets of gluon fields, one set is massive and another set is massless. Correspondingly, there may exists three sets of glueballs which have the same spin-parity but have different masses. A possible new kind of long-range force field is also discussed in this paper. |
1509.03993 | Hannu Paukkunen | Fran\c{c}ois Arleo, \'Emilien Chapon, Hannu Paukkunen | Scaling properties of inclusive W$^\pm$ production at hadron colliders | The version to appear in EPJC, references updated in v3 | null | 10.1140/epjc/s10052-016-4049-1 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the hadroproduction of W gauge bosons in their leptonic decay
mode. Starting from the leading-order expressions, we show that by defining a
suitable scaling variable the centre-of-mass dependence of the cross sections
at the LHC energies can be essentially described by a simple power law. The
scaling exponent is directly linked to the small-$x$ behaviour of parton
distribution functions (PDF) which, at the high virtualities involved in W
production, is largely dictated by QCD evolution equations. This entails a
particularly simple scaling law for the lepton charge asymmetry and also
predicts that measurements in different collision systems (p-p, p-$\bar{\rm
p}$, p-Pb Pb-Pb) are straightforwardly related. The expectations are compared
with the existing data and a very good overall agreement is observed. It is
shown that the PDF uncertainty in certain cross-section ratios between nearby
centre-of-mass energies can be significantly reduced by taking the ratios at
fixed value of scaling variable instead of fixed rapidity.
| [
{
"created": "Mon, 14 Sep 2015 08:38:46 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2016 11:53:09 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Apr 2016 05:36:32 GMT",
"version": "v3"
}
] | 2016-05-04 | [
[
"Arleo",
"François",
""
],
[
"Chapon",
"Émilien",
""
],
[
"Paukkunen",
"Hannu",
""
]
] | We consider the hadroproduction of W gauge bosons in their leptonic decay mode. Starting from the leading-order expressions, we show that by defining a suitable scaling variable the centre-of-mass dependence of the cross sections at the LHC energies can be essentially described by a simple power law. The scaling exponent is directly linked to the small-$x$ behaviour of parton distribution functions (PDF) which, at the high virtualities involved in W production, is largely dictated by QCD evolution equations. This entails a particularly simple scaling law for the lepton charge asymmetry and also predicts that measurements in different collision systems (p-p, p-$\bar{\rm p}$, p-Pb Pb-Pb) are straightforwardly related. The expectations are compared with the existing data and a very good overall agreement is observed. It is shown that the PDF uncertainty in certain cross-section ratios between nearby centre-of-mass energies can be significantly reduced by taking the ratios at fixed value of scaling variable instead of fixed rapidity. |
hep-ph/0304129 | Antoni Szczurek | Antoni Szczurek | From unintegrated gluon distributions to particle production in
nucleon-nucleon collisions at RHIC energies | 27 pages, 14 figures To appear in the special issue of Acta Physica
Polonica to celebrate the 65th Birthday of Prof. Jan Kwiecinski | Acta Phys.Polon. B34 (2003) 3191-3214 | null | null | hep-ph | null | The inclusive distributions of gluons and pions are calculated with absolute
normalization for high-energy nucleon-nucleon collisions. The results for
several unintegrated gluon distributions from the literature are compared. The
gluon distribution proposed recently by Kharzeev and Levin based on the idea of
gluon saturation is tested against DIS data from HERA. We find huge differences
in both rapidity and transverse momentum distributions of gluons and pions in
nucleon-nucleon collisions for different models of unintegrated gluon
distributions. The approximations used recently in the literature are
discussed. The Karzeev-Levin gluon distribution gives extremely good
description of momentum distribution of charged hadrons at midrapidities.
Contrary to a recent claim in the literature, we find that the gluonic
mechanism discussed does not describe the inclusive spectra of charged
particles in the fragmentation region, i.e. in the region of large $|y|$ for
any unintegrated gluon distribution from the literature.
| [
{
"created": "Mon, 14 Apr 2003 15:05:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Szczurek",
"Antoni",
""
]
] | The inclusive distributions of gluons and pions are calculated with absolute normalization for high-energy nucleon-nucleon collisions. The results for several unintegrated gluon distributions from the literature are compared. The gluon distribution proposed recently by Kharzeev and Levin based on the idea of gluon saturation is tested against DIS data from HERA. We find huge differences in both rapidity and transverse momentum distributions of gluons and pions in nucleon-nucleon collisions for different models of unintegrated gluon distributions. The approximations used recently in the literature are discussed. The Karzeev-Levin gluon distribution gives extremely good description of momentum distribution of charged hadrons at midrapidities. Contrary to a recent claim in the literature, we find that the gluonic mechanism discussed does not describe the inclusive spectra of charged particles in the fragmentation region, i.e. in the region of large $|y|$ for any unintegrated gluon distribution from the literature. |
1906.06486 | Sibo Zheng | Shuai Xu and Sibo Zheng | R-Symmetric NMSSM | v4: 15 pages, 3 figures | null | 10.1088/1674-1137/aca95c | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | It is well known that the observed Higgs mass is more naturally explained in
the NMSSM than in the MSSM. Without any violation of this success, there are
variants on the NMSSM which can lead to new phenomenologies. In this study we
propose a new variant of NMSSM by imposing an unbroken $R$ symmetry. We firstly
identify the minimal structure of such scenario from the perspective of both
simplicity and viability, then compare model predictions to current
experimental limits, and finally highlight main features that differ from the
well-known scenarios.
| [
{
"created": "Sat, 15 Jun 2019 07:22:47 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2019 00:42:46 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Dec 2019 14:30:18 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Feb 2021 10:39:54 GMT",
"version": "v4"
},
{
"cre... | 2023-07-25 | [
[
"Xu",
"Shuai",
""
],
[
"Zheng",
"Sibo",
""
]
] | It is well known that the observed Higgs mass is more naturally explained in the NMSSM than in the MSSM. Without any violation of this success, there are variants on the NMSSM which can lead to new phenomenologies. In this study we propose a new variant of NMSSM by imposing an unbroken $R$ symmetry. We firstly identify the minimal structure of such scenario from the perspective of both simplicity and viability, then compare model predictions to current experimental limits, and finally highlight main features that differ from the well-known scenarios. |
0705.4421 | Robert Fleischer | Robert Fleischer (CERN) | Exploring CP Violation and Penguin Effects through $B^0_d \to D^+ D^-$
and $B^0_s \to D^+_s D^-_s$ | 18 pages, 6 figures | Eur.Phys.J.C51:849-858,2007 | 10.1140/epjc/s10052-007-0341-4 | CERN-PH-TH/2007-092 | hep-ph | null | The decay $B^0_d \to D^+ D^-$ offers an interesting probe of CP violation,
but requires control of penguin effects, which can be done through $B^0_s \to
D^+_s D^-_s$ by means of the $U$-spin flavour symmetry of strong interactions.
Recently, the Belle collaboration reported indications of large CP violation in
the $B^0_d$ decay, which were, however, not confirmed by BaBar, and first
signals of the $B^0_s$ channel were observed at the Tevatron. In view of these
developments and the quickly approaching start of the LHC, we explore the
allowed region in observable space for CP violation in $B^0_d \to D^+ D^-$,
perform theoretical estimates of the relevant hadronic penguin parameters and
observables, and address questions both about the most promising strategies for
the extraction of CP-violating phases and about the interplay with other
measurements of CP violation and the search for new physics. As far as the
latter aspect is concerned, we point out that the $B^0_{q} \to D_{q}^+ D^-_{q}$
system provides a setting for the determination of the $B^0_q$-$\bar B^0_q$
mixing phases ($q\in\{d,s\}$) that is complementary to the conventional
$B^0_d\to J/\psi K_S$ and $B^0_s\to J/\psi \phi$ modes with respect to possible
new-physics effects in the electroweak penguin sector.
| [
{
"created": "Wed, 30 May 2007 16:12:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] | The decay $B^0_d \to D^+ D^-$ offers an interesting probe of CP violation, but requires control of penguin effects, which can be done through $B^0_s \to D^+_s D^-_s$ by means of the $U$-spin flavour symmetry of strong interactions. Recently, the Belle collaboration reported indications of large CP violation in the $B^0_d$ decay, which were, however, not confirmed by BaBar, and first signals of the $B^0_s$ channel were observed at the Tevatron. In view of these developments and the quickly approaching start of the LHC, we explore the allowed region in observable space for CP violation in $B^0_d \to D^+ D^-$, perform theoretical estimates of the relevant hadronic penguin parameters and observables, and address questions both about the most promising strategies for the extraction of CP-violating phases and about the interplay with other measurements of CP violation and the search for new physics. As far as the latter aspect is concerned, we point out that the $B^0_{q} \to D_{q}^+ D^-_{q}$ system provides a setting for the determination of the $B^0_q$-$\bar B^0_q$ mixing phases ($q\in\{d,s\}$) that is complementary to the conventional $B^0_d\to J/\psi K_S$ and $B^0_s\to J/\psi \phi$ modes with respect to possible new-physics effects in the electroweak penguin sector. |
hep-ph/0003164 | Sidney Bludman | Sidney A. Bludman | Vacuum Energy: "If Not Now, Then When?" | revision, extension of astro-ph/0002204, with one extra figure | null | 10.1016/S0375-9474(99)00733-2 | DESY 00/042 | hep-ph | null | For a flat universe presently dominated by static or dynamic vacuum energy,
cosmological constant (LCDM) or quintessence (QCDM), we calculate the
asymptotic collapsed mass fraction as function of the present ratio of smooth
energy to matter energy $\rat=(1-\omm)/\omm$. Identifying these collapsed
fractions as anthropic probabilities, we find the observed present ratio $\rat
\sim 2$ to be likely in LCDM, but most likely in QCDM.
| [
{
"created": "Thu, 16 Mar 2000 13:57:28 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bludman",
"Sidney A.",
""
]
] | For a flat universe presently dominated by static or dynamic vacuum energy, cosmological constant (LCDM) or quintessence (QCDM), we calculate the asymptotic collapsed mass fraction as function of the present ratio of smooth energy to matter energy $\rat=(1-\omm)/\omm$. Identifying these collapsed fractions as anthropic probabilities, we find the observed present ratio $\rat \sim 2$ to be likely in LCDM, but most likely in QCDM. |
1309.3135 | Swatantra Tiwari Kumar | S. K. Tiwari, and C. P. Singh | Production of Strange, Non-strange particles and Hypernuclei in an
Excluded-Volume Model | 4 pages, 5 figures, Invited talk in Strangeness in Quark Matter
(SQM)-2013, Birmingham, U.K | null | 10.1088/1742-6596/509/1/012097 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic study of production of strange and non-strange hadron
yields and their ratios obtained in various experiments using our
thermodynamically consistent excluded-volume model. We also analyze the
production of light nuclei, hypernuclei and their antinuclei in terms of our
excluded-volume model over a broad energy range starting from Alternating
Gradient Synchrotron (AGS) to Large Hadron Collider (LHC) energies. Further, we
extend our model for studying rapidity spectra of hadrons produced in heavy-ion
collisions.
| [
{
"created": "Thu, 12 Sep 2013 12:26:52 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Tiwari",
"S. K.",
""
],
[
"Singh",
"C. P.",
""
]
] | We present a systematic study of production of strange and non-strange hadron yields and their ratios obtained in various experiments using our thermodynamically consistent excluded-volume model. We also analyze the production of light nuclei, hypernuclei and their antinuclei in terms of our excluded-volume model over a broad energy range starting from Alternating Gradient Synchrotron (AGS) to Large Hadron Collider (LHC) energies. Further, we extend our model for studying rapidity spectra of hadrons produced in heavy-ion collisions. |
1804.02681 | Hanlin Li | Hanlin Li, Zi-Wei Lin, Fuqiang Wang | Charm quarks are more hydrodynamic than light quarks in final-state
elliptic flow | 10 pages, 4 figures | Phys. Rev. C 99, 044911 (2019) | 10.1103/PhysRevC.99.044911 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the charm quark elliptic flow ($v_{2}$) in heavy ion as well as
small system collisions by tracking the evolution history of quarks of
different flavors within a multi-phase transport model. The charm quark $v_{2}$
is studied as a function of the number of collisions the charm quark suffers
with other quarks and then compared to the $v_{2}$ of lighter quarks. We find
that the common escape mechanism is at work for both the charm and light quark
$v_{2}$. However, contrary to the naive expectation, the hydrodynamics-type
flow is found to contribute more to the final state charm $v_{2}$ than light
quark $v_{2}$. This could be explained by the smaller average deflection angle
the heavier charm quark undergoes in each collision, so that heavy quarks need
more scatterings to accumulate a significant $v_{2}$, while lighter quarks can
more easily change directions with scatterings with their $v_{2}$ coming more
from the escape mechanism. Our finding thus suggests that the charm $v_{2}$ is
a better probe for studying the hydrodynamic properties of the quark-gluon
plasma.
| [
{
"created": "Sun, 8 Apr 2018 12:28:00 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2018 16:10:26 GMT",
"version": "v2"
}
] | 2019-04-24 | [
[
"Li",
"Hanlin",
""
],
[
"Lin",
"Zi-Wei",
""
],
[
"Wang",
"Fuqiang",
""
]
] | We study the charm quark elliptic flow ($v_{2}$) in heavy ion as well as small system collisions by tracking the evolution history of quarks of different flavors within a multi-phase transport model. The charm quark $v_{2}$ is studied as a function of the number of collisions the charm quark suffers with other quarks and then compared to the $v_{2}$ of lighter quarks. We find that the common escape mechanism is at work for both the charm and light quark $v_{2}$. However, contrary to the naive expectation, the hydrodynamics-type flow is found to contribute more to the final state charm $v_{2}$ than light quark $v_{2}$. This could be explained by the smaller average deflection angle the heavier charm quark undergoes in each collision, so that heavy quarks need more scatterings to accumulate a significant $v_{2}$, while lighter quarks can more easily change directions with scatterings with their $v_{2}$ coming more from the escape mechanism. Our finding thus suggests that the charm $v_{2}$ is a better probe for studying the hydrodynamic properties of the quark-gluon plasma. |
0705.0803 | Wei Qi | K. Hagiwara, W. Qi, C.F. Qiao, J.X. Wang | Re-visiting Direct $J/\psi$ Production at the Fermilab Tevatron | Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages,
LaTeX, 4 eps figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-analyze the direct $\jp$ production processes at the Fermilab Tevatron
in view of the recent observation at the B-factories, where both $\jp$
inclusive and exclusive production rates are found to be about an order of
magnitude larger than the leading order estimates of non-relativistic QCD. The
charm quark fragmentation to $\jp$, which is the dominant color-singlet process
at high $p_T$, is normalized by the B-factory measurements. The process
receives further enhancement due to the charm sea contribution which has so far
been ignored in most analyses. After summing up all sub-process contributions,
we find that the color-singlet mechanism alone can account for 20% to 90% of
the observed direct $\jp$ high $p_T$ production. The polarization rate of the
directly produced $\jp$ is sensitive to the fraction of the color-octet
contribution, which is employed to fill the gap between the color-singlet
prediction and experimental data. With a bigger $K$-factor for the charm quark
fragmentation probability, we envisage a smaller matrix element for the
color-octet $^3S_1^{(8)}$ state, and this can be examined at the LHC in near
future.
| [
{
"created": "Sun, 6 May 2007 13:35:42 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2007 00:49:03 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Oct 2008 15:33:49 GMT",
"version": "v3"
}
] | 2008-10-20 | [
[
"Hagiwara",
"K.",
""
],
[
"Qi",
"W.",
""
],
[
"Qiao",
"C. F.",
""
],
[
"Wang",
"J. X.",
""
]
] | We re-analyze the direct $\jp$ production processes at the Fermilab Tevatron in view of the recent observation at the B-factories, where both $\jp$ inclusive and exclusive production rates are found to be about an order of magnitude larger than the leading order estimates of non-relativistic QCD. The charm quark fragmentation to $\jp$, which is the dominant color-singlet process at high $p_T$, is normalized by the B-factory measurements. The process receives further enhancement due to the charm sea contribution which has so far been ignored in most analyses. After summing up all sub-process contributions, we find that the color-singlet mechanism alone can account for 20% to 90% of the observed direct $\jp$ high $p_T$ production. The polarization rate of the directly produced $\jp$ is sensitive to the fraction of the color-octet contribution, which is employed to fill the gap between the color-singlet prediction and experimental data. With a bigger $K$-factor for the charm quark fragmentation probability, we envisage a smaller matrix element for the color-octet $^3S_1^{(8)}$ state, and this can be examined at the LHC in near future. |
hep-ph/9809552 | Sreerup Raychaudhuri | Debajyoti Choudhury, Anindya Datta and Sreerup Raychaudhuri | Higgs Boson Signals in Three b-jet Final States at the Fermilab Tevatron | 4 pages, 4 postscript figures, RevTeX (style files included) | null | null | CERN-TH/98-316 | hep-ph | null | At the Fermilab Tevatron, final states with three tagged b-jets could play an
important role in searches for a Higgs boson with mass in the range 100-300
GeV. These signals arise from gb fusion and we demonstrate their observability
in the limit of a large b-quark Yukawa coupling. Rather promising discovery
limits on such a coupling are obtained and consequent effects on the parameter
space of the Higgs-boson sector in the MSSM are discussed.
| [
{
"created": "Sat, 26 Sep 1998 20:37:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Datta",
"Anindya",
""
],
[
"Raychaudhuri",
"Sreerup",
""
]
] | At the Fermilab Tevatron, final states with three tagged b-jets could play an important role in searches for a Higgs boson with mass in the range 100-300 GeV. These signals arise from gb fusion and we demonstrate their observability in the limit of a large b-quark Yukawa coupling. Rather promising discovery limits on such a coupling are obtained and consequent effects on the parameter space of the Higgs-boson sector in the MSSM are discussed. |
hep-ph/9908474 | Marco Fabbrichesi | Stefano Bertolini and Marco Fabbrichesi | Lattice matrix elements confronting the experimental value of eps'/eps | JHEP.cls, 1 figure | JHEP 9910:011,1999 | 10.1088/1126-6708/1999/10/011 | SISSA 102/99/EP | hep-ph | null | A new lattice estimate of K -> 2 pi transitions claims, contrary to all other
computations, that the hadronic matrix element for the gluon penguin operator
Q_6 has opposite sign and, in addition, is much larger than the vacuum
saturation approximation. We comment under what conditions (if any) it is
possible to reconcile this lattice result with the experimental value of
eps'/eps. The dramatic impact of new physics in the kaon system that seems to
be required is not easily accommodated within our present theoretical
understanding.
| [
{
"created": "Thu, 26 Aug 1999 13:34:08 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 1999 14:31:24 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Sep 1999 13:12:26 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Bertolini",
"Stefano",
""
],
[
"Fabbrichesi",
"Marco",
""
]
] | A new lattice estimate of K -> 2 pi transitions claims, contrary to all other computations, that the hadronic matrix element for the gluon penguin operator Q_6 has opposite sign and, in addition, is much larger than the vacuum saturation approximation. We comment under what conditions (if any) it is possible to reconcile this lattice result with the experimental value of eps'/eps. The dramatic impact of new physics in the kaon system that seems to be required is not easily accommodated within our present theoretical understanding. |
1410.5440 | Christoph Englert | Christoph Englert, Yotam Soreq, Michael Spannowsky | Off-Shell Higgs Coupling Measurements in BSM scenarios | 11 pages, 9 figures, version published in JHEP | null | null | IPPP/14/91, DCPT/14/182 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proposals of measuring the off-shell Higgs contributions and first
measurements at the LHC have electrified the Higgs phenomenology community for
two reasons: Firstly, probing interactions at high invariant masses and
momentum transfers is intrinsically sensitive to new physics beyond the
Standard Model, irrespective of a resonant or non-resonant character of a
particular BSM scenario. Secondly, under specific assumptions a class of models
exists for which the off-shell coupling measurement together with a measurement
of the on-shell signal strength can be re-interpreted in terms of a bound on
the total Higgs boson width. In this paper, we provide a first step towards a
classification of the models for which a total width measurement is viable and
we discuss examples of BSM models for which the off-shell coupling measurement
can be important in either constraining or even discovering new physics in the
upcoming LHC runs. Specifically, we discuss the quantitative impact of the
presence of dimension six operators on the (de)correlation of Higgs on- and
off-shell regions keeping track of all interference effects. We furthermore
investigate off-shell measurements in a wider context of new (non-)resonant
physics in Higgs portal scenarios and the MSSM.
| [
{
"created": "Mon, 20 Oct 2014 20:00:48 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2015 10:57:54 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Englert",
"Christoph",
""
],
[
"Soreq",
"Yotam",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Proposals of measuring the off-shell Higgs contributions and first measurements at the LHC have electrified the Higgs phenomenology community for two reasons: Firstly, probing interactions at high invariant masses and momentum transfers is intrinsically sensitive to new physics beyond the Standard Model, irrespective of a resonant or non-resonant character of a particular BSM scenario. Secondly, under specific assumptions a class of models exists for which the off-shell coupling measurement together with a measurement of the on-shell signal strength can be re-interpreted in terms of a bound on the total Higgs boson width. In this paper, we provide a first step towards a classification of the models for which a total width measurement is viable and we discuss examples of BSM models for which the off-shell coupling measurement can be important in either constraining or even discovering new physics in the upcoming LHC runs. Specifically, we discuss the quantitative impact of the presence of dimension six operators on the (de)correlation of Higgs on- and off-shell regions keeping track of all interference effects. We furthermore investigate off-shell measurements in a wider context of new (non-)resonant physics in Higgs portal scenarios and the MSSM. |
1311.1578 | Timothy Hobbs | T. J. Hobbs, J. T. Londergan, and W. Melnitchouk | Phenomenology of nonperturbative charm in the nucleon | 50 pages, 12 figures, 3 tables, and 3 appendices | Phys. Rev. D 89, 074008 (2014) | 10.1103/PhysRevD.89.074008 | JLAB-THY-13-1813 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a comprehensive analysis of the role of nonperturbative (or
intrinsic) charm in the nucleon, generated through Fock state expansions of the
nucleon wave function involving five-quark virtual states represented by
charmed mesons and baryons. We consider contributions from a variety of charmed
meson-baryon states and find surprisingly dominant effects from the (Dbar^{*0}
Lambda_c+) configuration. Particular attention is paid to the existence and
persistence of high-x structure for intrinsic charm, and the x dependence of
the c-cbar asymmetry predicted in meson-baryon models. We discuss how studies
of charmed baryons and mesons in hadronic reactions can be used to constrain
models, and outline future measurements that could further illuminate the
intrinsic charm component of the nucleon.
| [
{
"created": "Thu, 7 Nov 2013 05:21:16 GMT",
"version": "v1"
}
] | 2014-04-23 | [
[
"Hobbs",
"T. J.",
""
],
[
"Londergan",
"J. T.",
""
],
[
"Melnitchouk",
"W.",
""
]
] | We perform a comprehensive analysis of the role of nonperturbative (or intrinsic) charm in the nucleon, generated through Fock state expansions of the nucleon wave function involving five-quark virtual states represented by charmed mesons and baryons. We consider contributions from a variety of charmed meson-baryon states and find surprisingly dominant effects from the (Dbar^{*0} Lambda_c+) configuration. Particular attention is paid to the existence and persistence of high-x structure for intrinsic charm, and the x dependence of the c-cbar asymmetry predicted in meson-baryon models. We discuss how studies of charmed baryons and mesons in hadronic reactions can be used to constrain models, and outline future measurements that could further illuminate the intrinsic charm component of the nucleon. |
1510.09200 | David Clark | D.B. Clark | Drell-Yan Production of W/Z at the LHC with Protons and Heavy Nuclei | 7 pages, 3 figures, DPF 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Drell-Yan W/Z electroweak boson production at the LHC is an essential
standard candle which is used for calibration of beam luminosity and detector
properties. In addition to proton-proton collisions, the LHC has measured heavy
nuclei lead-lead and proton-lead W/Z production. Inclusion of these data sets
in future fits can provide discriminating information of the nuclear
modifications present in the Parton Distribution Functions (PDFs). We present
an ongoing analysis of W/Z production in lead-lead and proton-lead collisions
at the LHC using the \texttt{nCTEQ15} nuclear Parton Distribution Functions
(nPDFs) including uncertainties. The cross sections are calculated at NLO with
the \texttt{FEWZ\ 2.1} program at 2.76 and 5.02 TeV. We identify promising
observables for the observation of the nuclear modifications.
| [
{
"created": "Fri, 30 Oct 2015 18:57:05 GMT",
"version": "v1"
}
] | 2015-11-02 | [
[
"Clark",
"D. B.",
""
]
] | Drell-Yan W/Z electroweak boson production at the LHC is an essential standard candle which is used for calibration of beam luminosity and detector properties. In addition to proton-proton collisions, the LHC has measured heavy nuclei lead-lead and proton-lead W/Z production. Inclusion of these data sets in future fits can provide discriminating information of the nuclear modifications present in the Parton Distribution Functions (PDFs). We present an ongoing analysis of W/Z production in lead-lead and proton-lead collisions at the LHC using the \texttt{nCTEQ15} nuclear Parton Distribution Functions (nPDFs) including uncertainties. The cross sections are calculated at NLO with the \texttt{FEWZ\ 2.1} program at 2.76 and 5.02 TeV. We identify promising observables for the observation of the nuclear modifications. |
2004.13753 | Long Chen | Taushif Ahmed, Werner Bernreuther, Long Chen and Michal Czakon | Polarized $q \bar{q} \rightarrow Z +$Higgs amplitudes at two loops in
QCD: the interplay between vector and axial vector form factors and a pitfall
in applying a non-anticommuting $\gamma_5$ | A few typos fixed along with minor typographic edits, references in
the manuscript and the ReadMe.txt updated, matched with the version accepted
by JHEP | null | 10.1007/JHEP07(2020)159 | MPP-2020-37, TTK-20-10, P3H-20-016 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider QCD corrections to two loops for the polarized amplitudes of
$q{\bar q}\to Z +$ Higgs boson. First we show how the polarized amplitudes of
$b \bar{b} \rightarrow Z h$ associated with a non-vanishing $b$-quark Yukawa
coupling and a scalar or pseudoscalar Higgs boson $h$ can be built up solely
from vector form factors (FF) of properly grouped classes of diagrams,
bypassing completely the need of explicitly manipulating $\gamma_5$ in
dimensional regularization (up to a few "anomalous", i.e., triangle diagrams).
We determine the contributions of the triangle diagrams in the heavy top limit.
We present the analytic results of the vector FF and the triangle-diagram
contributions to the axial vector FF, which are sufficient for deriving the
two-loop QCD amplitudes for $b \bar{b} \rightarrow Z h$ with a CP-even and
CP-odd Higgs boson $h$. We derive the respective Ward identity for these
amplitudes, which are subsequently verified to two-loop order in QCD using
these FF. In addition, the FF of a class of corrections to $q \bar{q}
\rightarrow ZH$ proportional to the top-Yukawa coupling are obtained
analytically to two-loop order in QCD in the heavy-top limit using the
Higgs-gluon effective Lagrangian where the top quark is integrated out. We
address a pitfall that occurs when applying the non-anticommutating $\gamma_5$
prescription to this class of contributions that has been overlooked so far in
the literature. We attribute this issue to the fact that the absence of certain
heavy-mass expanded diagrams in the infinite-mass limit of a scattering
amplitude with an axial vector current depends on the particular $\gamma_5$
prescription in use.
| [
{
"created": "Tue, 28 Apr 2020 18:01:39 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 2020 11:16:06 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Ahmed",
"Taushif",
""
],
[
"Bernreuther",
"Werner",
""
],
[
"Chen",
"Long",
""
],
[
"Czakon",
"Michal",
""
]
] | We consider QCD corrections to two loops for the polarized amplitudes of $q{\bar q}\to Z +$ Higgs boson. First we show how the polarized amplitudes of $b \bar{b} \rightarrow Z h$ associated with a non-vanishing $b$-quark Yukawa coupling and a scalar or pseudoscalar Higgs boson $h$ can be built up solely from vector form factors (FF) of properly grouped classes of diagrams, bypassing completely the need of explicitly manipulating $\gamma_5$ in dimensional regularization (up to a few "anomalous", i.e., triangle diagrams). We determine the contributions of the triangle diagrams in the heavy top limit. We present the analytic results of the vector FF and the triangle-diagram contributions to the axial vector FF, which are sufficient for deriving the two-loop QCD amplitudes for $b \bar{b} \rightarrow Z h$ with a CP-even and CP-odd Higgs boson $h$. We derive the respective Ward identity for these amplitudes, which are subsequently verified to two-loop order in QCD using these FF. In addition, the FF of a class of corrections to $q \bar{q} \rightarrow ZH$ proportional to the top-Yukawa coupling are obtained analytically to two-loop order in QCD in the heavy-top limit using the Higgs-gluon effective Lagrangian where the top quark is integrated out. We address a pitfall that occurs when applying the non-anticommutating $\gamma_5$ prescription to this class of contributions that has been overlooked so far in the literature. We attribute this issue to the fact that the absence of certain heavy-mass expanded diagrams in the infinite-mass limit of a scattering amplitude with an axial vector current depends on the particular $\gamma_5$ prescription in use. |
2009.13237 | Vladimir Galkin | R.N. Faustov, V.O. Galkin, E.M. Savchenko | Masses of the $QQ\bar Q\bar Q$ tetraquarks in the relativistic
diquark--antidiquark picture | 12 pages, references added, published version | Phys. Rev. D 102, 114030 (2020) | 10.1103/PhysRevD.102.114030 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Masses of the ground-state teraquarks composed from heavy $c$ and $b$ quarks
and antiquarks are calculated in the diquark-antidiquark picture in the
framework of the relativistic quark model based on the quasipotential approach.
The quasipotentials of the quark-quark and diquark-antidiquark interactions are
constructed similarly to the previous consideration of mesons and baryons. It
is assumed that the diquark and antidiquark interact in the tetraquark as a
whole and the internal structure of the diquarks is taken into account. All
such tetraquarks are found above the thresholds of decays to two heavy
quarkonia. This is a result of the consideration of the diquark not to be a
point-like object. Therefore such tetraquarks can be observed as broad
structures decaying dominantly to quarkonia. The broad structure next to the
di-$J/\psi$ mass threshold, recently observed by the LHCb Collaboration, can
correspond to the ground $2^{++}$-state tetraquark consisting of four charm
quarks.
| [
{
"created": "Mon, 28 Sep 2020 12:05:02 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2021 14:07:07 GMT",
"version": "v2"
}
] | 2021-01-12 | [
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
],
[
"Savchenko",
"E. M.",
""
]
] | Masses of the ground-state teraquarks composed from heavy $c$ and $b$ quarks and antiquarks are calculated in the diquark-antidiquark picture in the framework of the relativistic quark model based on the quasipotential approach. The quasipotentials of the quark-quark and diquark-antidiquark interactions are constructed similarly to the previous consideration of mesons and baryons. It is assumed that the diquark and antidiquark interact in the tetraquark as a whole and the internal structure of the diquarks is taken into account. All such tetraquarks are found above the thresholds of decays to two heavy quarkonia. This is a result of the consideration of the diquark not to be a point-like object. Therefore such tetraquarks can be observed as broad structures decaying dominantly to quarkonia. The broad structure next to the di-$J/\psi$ mass threshold, recently observed by the LHCb Collaboration, can correspond to the ground $2^{++}$-state tetraquark consisting of four charm quarks. |
1109.6631 | Marco Matone | Marco Matone | Superluminality and a Curious Phenomenon in the Relativistic Quantum
Hamilton-Jacobi Equation | 5 pages | Phys.Scripta 86 (2012) 055007 | 10.1088/0031-8949/86/05/055007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A basic problem in the relativistic quantum Hamilton-Jacobi theory is to
understand whether it may admit superluminal solutions. Here we consider the
averaging of the speed on a period of the oscillating term which is similar to
Dirac's averaging of the oscillating part of the free electron's speed. Such an
averaging solves the problem of getting the $\hbar\to 0$ limit of the speed of
the free particle, and leads to solutions that, depending on the integration
constants, may be superluminal.
| [
{
"created": "Thu, 29 Sep 2011 19:20:37 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2011 18:58:37 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Dec 2012 11:14:05 GMT",
"version": "v3"
}
] | 2018-06-20 | [
[
"Matone",
"Marco",
""
]
] | A basic problem in the relativistic quantum Hamilton-Jacobi theory is to understand whether it may admit superluminal solutions. Here we consider the averaging of the speed on a period of the oscillating term which is similar to Dirac's averaging of the oscillating part of the free electron's speed. Such an averaging solves the problem of getting the $\hbar\to 0$ limit of the speed of the free particle, and leads to solutions that, depending on the integration constants, may be superluminal. |
2207.06060 | Zhi-Gang Wang | Xiu-Wu Wang, Zhi-Gang Wang | Analysis of the $P_{cs}(4338)$ and related pentaquark molecular states
via the QCD sum rules | 20 pages, 5 figures | Chin. Phys. C47 (2023) 013109 | 10.1088/1674-1137/ac9aab | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we tentatively identify the $P_{cs}(4338)$ as the
$\bar{D}\Xi_c$ molecular state, and distinguish the isospins of the current
operators to explore the $\bar{D}\Xi_c$, $\bar{D}\Lambda_c$, $\bar{D}_s\Xi_c$,
$\bar{D}_s\Lambda_c$, $\bar{D}^*\Xi_c$, $\bar{D}^*\Lambda_c$,
$\bar{D}^*_s\Xi_c$ and $\bar{D}^*_s\Lambda_c$ molecular states without strange,
with strange and with double strange in the framework of the QCD sum rules in
details. The present explorations favor identifying the $P_{cs}(4338)$
($P_{cs}(4459)$) as the $\bar{D}\Xi_c$ ($\bar{D}^*\Xi_c$) molecular state with
the spin-parity $J^P={\frac{1}{2}}^-$ (${\frac{3}{2}}^-$) and isospin
$(I,I_3)=(0,0)$, the observation of their cousins with the isospin
$(I,I_3)=(1,0)$ in the $J/\psi\Sigma^0/\eta_c\Sigma^0$ invariant mass
distributions would decipher their inner structures.
| [
{
"created": "Wed, 13 Jul 2022 09:07:31 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2022 14:18:24 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Aug 2022 14:27:30 GMT",
"version": "v3"
},
{
"created": "Sun, 4 Sep 2022 03:33:27 GMT",
"version": "v4"
},
{
"crea... | 2022-11-28 | [
[
"Wang",
"Xiu-Wu",
""
],
[
"Wang",
"Zhi-Gang",
""
]
] | In this work, we tentatively identify the $P_{cs}(4338)$ as the $\bar{D}\Xi_c$ molecular state, and distinguish the isospins of the current operators to explore the $\bar{D}\Xi_c$, $\bar{D}\Lambda_c$, $\bar{D}_s\Xi_c$, $\bar{D}_s\Lambda_c$, $\bar{D}^*\Xi_c$, $\bar{D}^*\Lambda_c$, $\bar{D}^*_s\Xi_c$ and $\bar{D}^*_s\Lambda_c$ molecular states without strange, with strange and with double strange in the framework of the QCD sum rules in details. The present explorations favor identifying the $P_{cs}(4338)$ ($P_{cs}(4459)$) as the $\bar{D}\Xi_c$ ($\bar{D}^*\Xi_c$) molecular state with the spin-parity $J^P={\frac{1}{2}}^-$ (${\frac{3}{2}}^-$) and isospin $(I,I_3)=(0,0)$, the observation of their cousins with the isospin $(I,I_3)=(1,0)$ in the $J/\psi\Sigma^0/\eta_c\Sigma^0$ invariant mass distributions would decipher their inner structures. |
1105.4594 | Ciaran Williams | John M. Campbell, Adam Martin, Ciaran Williams | NLO predictions for a lepton, missing transverse momentum and dijets at
the Tevatron | 4 pages, 5 figures | Phys.Rev.D84:036005,2011 | 10.1103/PhysRevD.84.036005 | FERMILAB-PUB-11-218-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | n this letter we investigate the various processes that can contribute to a
final state consisting of a lepton, missing transverse momentum and two jets at
Next to Leading Order (NLO) at the Tevatron. In particular we consider the
production of W/Z + 2 jets, diboson pairs, single top and the tt process with
both fully leptonic and semi-leptonic decays. We present distributions for the
invariant mass of the dijet system and normalisations of the various processes,
accurate to NLO.
| [
{
"created": "Mon, 23 May 2011 19:39:46 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Campbell",
"John M.",
""
],
[
"Martin",
"Adam",
""
],
[
"Williams",
"Ciaran",
""
]
] | n this letter we investigate the various processes that can contribute to a final state consisting of a lepton, missing transverse momentum and two jets at Next to Leading Order (NLO) at the Tevatron. In particular we consider the production of W/Z + 2 jets, diboson pairs, single top and the tt process with both fully leptonic and semi-leptonic decays. We present distributions for the invariant mass of the dijet system and normalisations of the various processes, accurate to NLO. |
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