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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9803211 | null | Levan R. Surguladze | O(\alpha^n\alpha_s^m) Corrections in e^+e^- Annihilation and \tau Decay | 8 pages, Latex, no figures | null | null | UAHEP969 | hep-ph | null | The results of evaluation of mixed QED X QCD corrections to R(s) in e^+e^-
annihilation and R_{\tau} in hadronic decay of the \tau lepton to
O(\alpha^n\alpha_s^m), m+n \leq 3, are presented. The net effect on
\alpha_s(M_Z) from the Z decay is only about 0.1% and in the \tau decay case
the net effect is negligible, as expected.
| [
{
"created": "Mon, 2 Mar 1998 03:29:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Surguladze",
"Levan R.",
""
]
] | The results of evaluation of mixed QED X QCD corrections to R(s) in e^+e^- annihilation and R_{\tau} in hadronic decay of the \tau lepton to O(\alpha^n\alpha_s^m), m+n \leq 3, are presented. The net effect on \alpha_s(M_Z) from the Z decay is only about 0.1% and in the \tau decay case the net effect is negligible, as expected. |
1209.5586 | Yutaka Tobita | Kenzo Ishikawa and Yutaka Tobita | Long-range correlations of neutrinos in hadron reactions and neutrino
diffraction II: neutrino | 73 pages, 14 figures. The previous manuscript arXiv:1206.2593v1 was
divided to 2 parts, I and this II. Based on I [arXiv:1206.2593], the
finite-size correction to a probability to detect a neutrino in pion decay
are presented | null | null | EPHOU-12-008 | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this II, a probability to detect the neutrino produced in a high-energy
pion decay is shown to receive the large finite-size correction. The neutrino
interacts extremely weakly with matters and is described with a many-body wave
function together with the pion and charged lepton. This wave function slowly
approaches to an asymptotic form, which is probed by the neutrino. The whole
process is described by an S-matrix of a finite-time interval, which couples
with states of non-conserving kinetic energy, and the final states of a broad
spectrum specific to a relativistic invariant system contribute to the positive
semi-definite correction similar to diffraction of waves through a hole. This
diffraction component for the neutrino becomes long range and stable under
changes of the pion's energy.
Moreover, it has a universal form that depends on the absolute neutrino mass.
Thus a new method of measuring the absolute neutrino mass is suggested.
| [
{
"created": "Tue, 25 Sep 2012 11:35:46 GMT",
"version": "v1"
}
] | 2012-09-26 | [
[
"Ishikawa",
"Kenzo",
""
],
[
"Tobita",
"Yutaka",
""
]
] | In this II, a probability to detect the neutrino produced in a high-energy pion decay is shown to receive the large finite-size correction. The neutrino interacts extremely weakly with matters and is described with a many-body wave function together with the pion and charged lepton. This wave function slowly approaches to an asymptotic form, which is probed by the neutrino. The whole process is described by an S-matrix of a finite-time interval, which couples with states of non-conserving kinetic energy, and the final states of a broad spectrum specific to a relativistic invariant system contribute to the positive semi-definite correction similar to diffraction of waves through a hole. This diffraction component for the neutrino becomes long range and stable under changes of the pion's energy. Moreover, it has a universal form that depends on the absolute neutrino mass. Thus a new method of measuring the absolute neutrino mass is suggested. |
hep-ph/0204085 | Pere Talavera | D. Espriu, J. Manzano and P. Talavera (U. Barcelona, ECM & CER) | Flavour Mixing, Gauge Invariance and Wave-function Renormalisation | 19 pages, plain latex, one ps figure | Phys.Rev. D66 (2002) 076002 | 10.1103/PhysRevD.66.076002 | UB-ECM-PF 02/06 | hep-ph | null | We clarify some aspects of the LSZ formalism and wave function
renormalisation for unstable particles in the presence of electroweak
interactions when mixing and CP violation are considered. We also analyse the
renormalisation of the CKM mixing matrix which is closely related to wave
function renormalisation. We critically review earlier attempts to define a set
of "on-shell" wave function renormalisation constants. With the aid of an
extensive use of the Nielsen identities complemented by explicit calculations
we corroborate that the counter term for the CKM mixing matrix must be
explicitly gauge independent and demonstrate that the commonly used
prescription for the wave function renormalisation constants leads to gauge
parameter dependent amplitudes, even if the CKM counter term is gauge invariant
as required. We show that a proper LSZ-compliant prescription leads to gauge
independent amplitudes. The resulting wave function renormalisation constants
necessarily possess absorptive parts, but we verify that they comply with the
expected requirements concerning CP and CPT. The results obtained using this
prescription are different (even at the level of the modulus squared of the
amplitude) from the ones neglecting the absorptive parts in the case of top
decay. The difference is numerically relevant.
| [
{
"created": "Mon, 8 Apr 2002 08:00:08 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Espriu",
"D.",
"",
"U. Barcelona, ECM & CER"
],
[
"Manzano",
"J.",
"",
"U. Barcelona, ECM & CER"
],
[
"Talavera",
"P.",
"",
"U. Barcelona, ECM & CER"
]
] | We clarify some aspects of the LSZ formalism and wave function renormalisation for unstable particles in the presence of electroweak interactions when mixing and CP violation are considered. We also analyse the renormalisation of the CKM mixing matrix which is closely related to wave function renormalisation. We critically review earlier attempts to define a set of "on-shell" wave function renormalisation constants. With the aid of an extensive use of the Nielsen identities complemented by explicit calculations we corroborate that the counter term for the CKM mixing matrix must be explicitly gauge independent and demonstrate that the commonly used prescription for the wave function renormalisation constants leads to gauge parameter dependent amplitudes, even if the CKM counter term is gauge invariant as required. We show that a proper LSZ-compliant prescription leads to gauge independent amplitudes. The resulting wave function renormalisation constants necessarily possess absorptive parts, but we verify that they comply with the expected requirements concerning CP and CPT. The results obtained using this prescription are different (even at the level of the modulus squared of the amplitude) from the ones neglecting the absorptive parts in the case of top decay. The difference is numerically relevant. |
hep-ph/9211262 | Ivan | Kingman Cheung | Associated production of Intermediate Higgs or Z-boson with $t \bar t$
pair in $\gamma \gamma$ collision | Latex(RevTex), 13 pages, 5 topdrawer figures (available on request) | Phys.Rev. D47 (1993) 3750-3756 | 10.1103/PhysRevD.47.3750 | NUHEP-TH-92-21 | hep-ph | null | Photon-photon linear colliders can be realized by laser back-scattering
technique on the next generation linear $e^+e^-$ colliders. Here the associated
productions of an intermediate mass Higgs (IMH) or Z-boson with $t \bar t$ pair
in $\gamma\gamma$ collisions are studied. Since IMH is very unlikely to decay
into $t\bar t$ pair, $t\bar tH$ production is the only direct channel to probe
the Higgs-top Yukawa coupling in case of an IMH. $t\bar tZ$ production can be a
potential background to $t\bar tH$ if the Higgs mass is close to $m_Z$. As an
alternative to its parent $e^+e^-$ collider, $\gamma\gamma \to t\bar tH(Z)$
productions are compared with the corresponding productions in the $e^+e^-$
collisions.
| [
{
"created": "Tue, 17 Nov 1992 20:23:50 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Cheung",
"Kingman",
""
]
] | Photon-photon linear colliders can be realized by laser back-scattering technique on the next generation linear $e^+e^-$ colliders. Here the associated productions of an intermediate mass Higgs (IMH) or Z-boson with $t \bar t$ pair in $\gamma\gamma$ collisions are studied. Since IMH is very unlikely to decay into $t\bar t$ pair, $t\bar tH$ production is the only direct channel to probe the Higgs-top Yukawa coupling in case of an IMH. $t\bar tZ$ production can be a potential background to $t\bar tH$ if the Higgs mass is close to $m_Z$. As an alternative to its parent $e^+e^-$ collider, $\gamma\gamma \to t\bar tH(Z)$ productions are compared with the corresponding productions in the $e^+e^-$ collisions. |
0807.0828 | Richard J. Gonsalves | Richard J. Gonsalves | Perturbative QCD at High Energy Colliders | 18 pages, 12 figures, contribution to the Symposium: 50+ Years of
High Energy Physics at UB, University at Buffalo, October 20-21, 2006. Added
references in section 4 | Int.J.Mod.Phys.E17:870-890,2008 | 10.1142/S0218301308010210 | UB-HET-08-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Selected applications of perturbative Quantumchromodynamics (QCD) to
predictions of the Standard Model for processes at high energy colliders are
reviewed with emphasis on past successes and future problems. This is a
personal retrospective is not intended to be a comprehensive review of the
field.
| [
{
"created": "Fri, 4 Jul 2008 22:05:39 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jul 2008 21:18:04 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Jul 2008 20:15:12 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gonsalves",
"Richard J.",
""
]
] | Selected applications of perturbative Quantumchromodynamics (QCD) to predictions of the Standard Model for processes at high energy colliders are reviewed with emphasis on past successes and future problems. This is a personal retrospective is not intended to be a comprehensive review of the field. |
1407.6914 | Frederic Br\"unner | Frederic Br\"unner, Denis Parganlija and Anton Rebhan | Holographic Glueball Decay | Proceedings based on a talk by F. Br\"unner at Excited QCD 2014; v2:
Erratum included, containing corrected results for the decay rate into two
pions; v3: minor corrections | Acta Phys.Polon.Supp. 7 (2014) 3, 533 | 10.5506/APhysPolBSupp.7.533 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We announce new results on glueball decay rates in the Sakai-Sugimoto model,
a realization of holographic QCD from first principles that has only one
coupling constant and an overall mass scale as free parameters. We extend a
previous investigation by Hashimoto, Tan, and Terashima who have considered the
lowest scalar glueball which arises from a somewhat exotic polarization of
supergravity modes and whose mass is uncomfortably small in comparison with
lattice results. On the other hand, the scalar glueball dual to the dilaton
turns out to have a mass of about twice the mass of the rho meson (1487 MeV),
very close to the scalar meson $f_0(1500)$ that is frequently interpreted as
predominantly glue. Calculating the decay rate into two pions we find a
surprisingly good agreement with experimental data for the $f_0(1500)$. We have
also obtained decay widths for tensor and excited scalar glueballs, indicating
universal narrowness.
| [
{
"created": "Fri, 25 Jul 2014 14:25:20 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Sep 2014 14:59:26 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Sep 2014 15:34:29 GMT",
"version": "v3"
}
] | 2014-09-18 | [
[
"Brünner",
"Frederic",
""
],
[
"Parganlija",
"Denis",
""
],
[
"Rebhan",
"Anton",
""
]
] | We announce new results on glueball decay rates in the Sakai-Sugimoto model, a realization of holographic QCD from first principles that has only one coupling constant and an overall mass scale as free parameters. We extend a previous investigation by Hashimoto, Tan, and Terashima who have considered the lowest scalar glueball which arises from a somewhat exotic polarization of supergravity modes and whose mass is uncomfortably small in comparison with lattice results. On the other hand, the scalar glueball dual to the dilaton turns out to have a mass of about twice the mass of the rho meson (1487 MeV), very close to the scalar meson $f_0(1500)$ that is frequently interpreted as predominantly glue. Calculating the decay rate into two pions we find a surprisingly good agreement with experimental data for the $f_0(1500)$. We have also obtained decay widths for tensor and excited scalar glueballs, indicating universal narrowness. |
1806.11182 | Andrew Buckley | Andy Buckley, Holger Schulz | Tuning of MC generator MPI models | Contributed chapter to "Multiple Parton Interactions at the LHC",
World Scientific 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | MC models of multiple partonic scattering inevitably introduce many free
parameters, either fundamental to the models or from their integration with MC
treatments of primary-scattering evolution. This non-perturbative and
non-factorisable physics in particular cannot currently be constrained from
theoretical principles, and hence parameter optimisation against experimental
data is required. This process is commonly referred to as MC tuning. We
summarise the principles, problems and history of MC tuning, and the
still-evolving modern approach to both model optimisation and estimation of
modelling uncertainties.
| [
{
"created": "Thu, 28 Jun 2018 20:51:40 GMT",
"version": "v1"
}
] | 2018-07-02 | [
[
"Buckley",
"Andy",
""
],
[
"Schulz",
"Holger",
""
]
] | MC models of multiple partonic scattering inevitably introduce many free parameters, either fundamental to the models or from their integration with MC treatments of primary-scattering evolution. This non-perturbative and non-factorisable physics in particular cannot currently be constrained from theoretical principles, and hence parameter optimisation against experimental data is required. This process is commonly referred to as MC tuning. We summarise the principles, problems and history of MC tuning, and the still-evolving modern approach to both model optimisation and estimation of modelling uncertainties. |
1011.5225 | Piero Nicolini | Martin Sprenger, Piero Nicolini, Marcus Bleicher | Neutrino oscillations as a novel probe for a minimal length | 11 pages, 3 figures; v2 title changed, minor modifications,
references added; v3 new conclusions, updated plots, enlarged reference list,
version in press on Classical and Quantum Gravity | Class.Quant.Grav.28:235019,2011 | 10.1088/0264-9381/28/23/235019 | null | hep-ph gr-qc hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that the presence of a quantum gravity induced minimal length can
be explored using neutrino oscillation probabilities. Neutrinos seem ideally
suited for this investigation because they can propagate freely over large
distances and can therefore pile up minimal length effects beyond detectable
thresholds. We determine the modified survival probability in a scenario with a
minimal length and find deviations from the classical behaviour for high
energies. We find that for the currently available experimental statistics the
deviations from the standard oscillations do only allow for a bound of
$\ell^{-1}\gtrsim 10 \mathrm{GeV}$ from MINOS data. On the other hand,
oscillations of high-energy neutrinos emitted by galactic and extragalactic
sources are strongly suppressed, leading to a possible observation of quantum
gravity effects at neutrino telescopes such as IceCube and ANTARES.
| [
{
"created": "Tue, 23 Nov 2010 21:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jan 2011 14:04:21 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Nov 2011 08:43:24 GMT",
"version": "v3"
}
] | 2011-11-21 | [
[
"Sprenger",
"Martin",
""
],
[
"Nicolini",
"Piero",
""
],
[
"Bleicher",
"Marcus",
""
]
] | We suggest that the presence of a quantum gravity induced minimal length can be explored using neutrino oscillation probabilities. Neutrinos seem ideally suited for this investigation because they can propagate freely over large distances and can therefore pile up minimal length effects beyond detectable thresholds. We determine the modified survival probability in a scenario with a minimal length and find deviations from the classical behaviour for high energies. We find that for the currently available experimental statistics the deviations from the standard oscillations do only allow for a bound of $\ell^{-1}\gtrsim 10 \mathrm{GeV}$ from MINOS data. On the other hand, oscillations of high-energy neutrinos emitted by galactic and extragalactic sources are strongly suppressed, leading to a possible observation of quantum gravity effects at neutrino telescopes such as IceCube and ANTARES. |
0807.5128 | Matthew Moulson | V. Cirigliano, C. Gatti, M. Moulson, M. Palutan (for the FlaviaNet
Kaon Working Group) | pi pi Phase shifts from K to 2 pi | 6 pages | null | null | LA-UR-07-8412 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update the numerical results for the s-wave pi pi scattering phase-shift
difference delta_0^0 - delta_0^2 at s = m_K^2 from a previous study of isospin
breaking in K to 2 pi amplitudes in chiral perturbation theory. We include
recent data for the K_S to pi pi and K^+ to pi^+ pi^0 decay widths and include
experimental correlations.
| [
{
"created": "Thu, 31 Jul 2008 18:59:48 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Cirigliano",
"V.",
"",
"for the FlaviaNet\n Kaon Working Group"
],
[
"Gatti",
"C.",
"",
"for the FlaviaNet\n Kaon Working Group"
],
[
"Moulson",
"M.",
"",
"for the FlaviaNet\n Kaon Working Group"
],
[
"Palutan",
"M.",
"",
"for the Fla... | We update the numerical results for the s-wave pi pi scattering phase-shift difference delta_0^0 - delta_0^2 at s = m_K^2 from a previous study of isospin breaking in K to 2 pi amplitudes in chiral perturbation theory. We include recent data for the K_S to pi pi and K^+ to pi^+ pi^0 decay widths and include experimental correlations. |
1703.08450 | Tevong You | John Ellis, Nick E. Mavromatos and Tevong You | Light-by-Light Scattering Constraint on Born-Infeld Theory | 11 pages, 4 figures, version accepted for publication in PRL | Phys. Rev. Lett. 118, 261802 (2017) | 10.1103/PhysRevLett.118.261802 | CAVENDISH-HEP-17-04, DAMTP-2017-12, KCL-PH-TH/2017-11,
CERN-TH/2017-062 | hep-ph hep-ex hep-th nucl-ex physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent measurement by ATLAS of light-by-light scattering in LHC Pb-Pb
collisions is the first direct evidence for this basic process. We find that it
requires the mass scale of a nonlinear Born-Infeld extension of QED to be
$\gtrsim 100$~GeV, a much stronger constraint than those derived previously. In
the case of a Born-Infeld extension of the Standard Model in which the
U(1)$_{\rm Y}$ hypercharge gauge symmetry is realized nonlinearly, the limit on
the corresponding mass scale is $\gtrsim 90$~GeV, which in turn imposes a lower
limit of $\gtrsim 11$~TeV on the magnetic monopole mass in such a U(1)$_{\rm
Y}$ Born-Infeld theory.
| [
{
"created": "Fri, 24 Mar 2017 15:06:40 GMT",
"version": "v1"
},
{
"created": "Wed, 24 May 2017 21:05:05 GMT",
"version": "v2"
}
] | 2017-07-05 | [
[
"Ellis",
"John",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"You",
"Tevong",
""
]
] | The recent measurement by ATLAS of light-by-light scattering in LHC Pb-Pb collisions is the first direct evidence for this basic process. We find that it requires the mass scale of a nonlinear Born-Infeld extension of QED to be $\gtrsim 100$~GeV, a much stronger constraint than those derived previously. In the case of a Born-Infeld extension of the Standard Model in which the U(1)$_{\rm Y}$ hypercharge gauge symmetry is realized nonlinearly, the limit on the corresponding mass scale is $\gtrsim 90$~GeV, which in turn imposes a lower limit of $\gtrsim 11$~TeV on the magnetic monopole mass in such a U(1)$_{\rm Y}$ Born-Infeld theory. |
1406.0102 | Florian Goertz | Florian Goertz | An Indirect Handle on the Down-Quark Yukawa Coupling | 7 pages, 5 figures | Phys. Rev. Lett. 113, 261803 (2014) | 10.1103/PhysRevLett.113.261803 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To measure the Yukawa couplings of the up and down quarks, Y_{u,d}, seems to
be far beyond the capabilities of current and (near) future experiments in
particle physics. By performing a general analysis of the potential
misalignment between quark masses and Yukawa couplings, we derive predictions
for the magnitude of induced flavor-changing neutral currents (FCNCs),
depending on the shift in the physical Yukawa coupling of first-generation
quarks. We find that a shift of -100% in the down-quark Yukawa Y_d would
generically result in ds transitions in conflict with Kaon physics. This could
already be seen as evidence for a non-vanishing direct coupling of the down
quark to the newly discovered Higgs boson. The non-observation of certain,
already well-constrained, processes is thus turned into a powerful indirect
measure of physical parameters of the effective Standard-Model, which are so
far basically unconstrained from experiment and extremely challenging to access
with other methods. In particular, we can already deduce that Y_d should vary
at most by ~50% from its Standard Model value, barring an alignment of new
physics effects with the SM Yukawa couplings. Such an (orthogonal) alignment
scenario is however in general much easier to test at the LHC. Similarly,
improvements in limits on FCNCs in the up-type quark sector can lead to
valuable information on the physical Yukawa coupling of the up-quark.
| [
{
"created": "Sat, 31 May 2014 19:22:25 GMT",
"version": "v1"
}
] | 2014-12-31 | [
[
"Goertz",
"Florian",
""
]
] | To measure the Yukawa couplings of the up and down quarks, Y_{u,d}, seems to be far beyond the capabilities of current and (near) future experiments in particle physics. By performing a general analysis of the potential misalignment between quark masses and Yukawa couplings, we derive predictions for the magnitude of induced flavor-changing neutral currents (FCNCs), depending on the shift in the physical Yukawa coupling of first-generation quarks. We find that a shift of -100% in the down-quark Yukawa Y_d would generically result in ds transitions in conflict with Kaon physics. This could already be seen as evidence for a non-vanishing direct coupling of the down quark to the newly discovered Higgs boson. The non-observation of certain, already well-constrained, processes is thus turned into a powerful indirect measure of physical parameters of the effective Standard-Model, which are so far basically unconstrained from experiment and extremely challenging to access with other methods. In particular, we can already deduce that Y_d should vary at most by ~50% from its Standard Model value, barring an alignment of new physics effects with the SM Yukawa couplings. Such an (orthogonal) alignment scenario is however in general much easier to test at the LHC. Similarly, improvements in limits on FCNCs in the up-type quark sector can lead to valuable information on the physical Yukawa coupling of the up-quark. |
2204.03608 | Jing-Hui Huang | Jing-Hui Huang and Xiang-Yun Hu and Qi Wang and Xue-Ying Duan and
Guang-Jun Wang and Huan Chen | Influence of light quark loops on the Wigner phase with Dyson-Schwinger
equations approach | 12 pages, 8 figures | null | 10.1140/epja/s10050-022-00774-y | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the influence of light quark loops on the Wigner phase by solving
coupled Dyson-Schwinger equations for quark propagator and gluon propagator. We
take the gluon propagator in the Nambu phase from $N_f$ = 2 unquenched lattice
QCD and choose various phenomenological models for the quark-gluon vertex. The
gluon propagator in Winger phase is assumed to be different from that in the
Nambu phase only due to the vacuum polarization of the quark loop. We obtain
the Wigner solution of the coupled equations, compared with that from solving
only the equation of the quark propagator. We discussed the corrections by the
light quark loops and the dependence on various models of the quark-gluon
vertex.
| [
{
"created": "Thu, 7 Apr 2022 17:33:03 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Huang",
"Jing-Hui",
""
],
[
"Hu",
"Xiang-Yun",
""
],
[
"Wang",
"Qi",
""
],
[
"Duan",
"Xue-Ying",
""
],
[
"Wang",
"Guang-Jun",
""
],
[
"Chen",
"Huan",
""
]
] | We study the influence of light quark loops on the Wigner phase by solving coupled Dyson-Schwinger equations for quark propagator and gluon propagator. We take the gluon propagator in the Nambu phase from $N_f$ = 2 unquenched lattice QCD and choose various phenomenological models for the quark-gluon vertex. The gluon propagator in Winger phase is assumed to be different from that in the Nambu phase only due to the vacuum polarization of the quark loop. We obtain the Wigner solution of the coupled equations, compared with that from solving only the equation of the quark propagator. We discussed the corrections by the light quark loops and the dependence on various models of the quark-gluon vertex. |
2212.13008 | Xuan Luo | Jialiang Lu, Xuan Luo, Mao Song and Gang Li | Triangle mechanism in the decay process $B_0 \to J/\psi K^0
f_0(980)(a_0(980))$ | 8 pages, 6 figures | null | 10.1088/1674-1137/accf6d | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of the triangle mechanism in the decay process $B_0\to J/\psi K^0f_0
\to J/\psi K^0\pi^+\pi^-$ and $B_0\to J\psi K^0a_0\to J/\psi K^0 \pi^0\eta$ is
probed. In these process, the triangle singularity appears from the decay of
$B^0$ into $J/\psi\phi K^0$ then $\phi$ decays into $K^0\bar{K^0}$ and
$K^0\bar{K^0}$ merged into $f_0$ or $a_0$ which finally decay into $\pi^+\pi^-$
and $\pi^0\eta$ respectively. We find that this mechanism leads to a triangle
singularity around $M_{\rm inv}(K^0f_0(a_0))\approx1520\ {\rm MeV}$, and gives
sizable branching fractions ${\rm{Br}}(B_0\to J/\psi K^0f_0\to J/\psi
K^0\pi^+\pi^-)=1.38\times10^{-6}$ and $ {\rm{Br}}(B_0\to J/\psi K^0a_0\to
J/\psi K^0\pi^0\eta)=2.56\times10^{-7}$. This potential investigation can help
us obtain the information of the scalar meson $f_0(980)$ or $a_0(980)$.
| [
{
"created": "Mon, 26 Dec 2022 04:16:53 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Lu",
"Jialiang",
""
],
[
"Luo",
"Xuan",
""
],
[
"Song",
"Mao",
""
],
[
"Li",
"Gang",
""
]
] | The role of the triangle mechanism in the decay process $B_0\to J/\psi K^0f_0 \to J/\psi K^0\pi^+\pi^-$ and $B_0\to J\psi K^0a_0\to J/\psi K^0 \pi^0\eta$ is probed. In these process, the triangle singularity appears from the decay of $B^0$ into $J/\psi\phi K^0$ then $\phi$ decays into $K^0\bar{K^0}$ and $K^0\bar{K^0}$ merged into $f_0$ or $a_0$ which finally decay into $\pi^+\pi^-$ and $\pi^0\eta$ respectively. We find that this mechanism leads to a triangle singularity around $M_{\rm inv}(K^0f_0(a_0))\approx1520\ {\rm MeV}$, and gives sizable branching fractions ${\rm{Br}}(B_0\to J/\psi K^0f_0\to J/\psi K^0\pi^+\pi^-)=1.38\times10^{-6}$ and $ {\rm{Br}}(B_0\to J/\psi K^0a_0\to J/\psi K^0\pi^0\eta)=2.56\times10^{-7}$. This potential investigation can help us obtain the information of the scalar meson $f_0(980)$ or $a_0(980)$. |
hep-ph/0105110 | Boris Kopeliovich | B.Z. Kopeliovich, A.V. Tarasov and O.O. Voskresenskaya | Long-Range Coulomb Forces in DIS: Missed Radiative Corrections? | 24 pages including 4 figures. Fig.4 is modified and stylistic
corrections are made. The final version to appear in Eur.Phys.J.A | Eur.Phys.J. A11 (2001) 345-356 | 10.1007/s100500170074 | null | hep-ph nucl-th | null | The Born approximation, one photon exchange, used for DIS is subject to
virtual radiative corrections which are related to the long-range Coulomb
forces. They may be sizeable for heavy nuclei since Z\alpha is not a small
parameter. So far these corrections are known only for two processes, elastic
scattering and bremsstrahlung on the Coulomb field of a point-like target.
While the former amplitude acquires only a phase, in the latter case the cross
section is modified also. Although the problem of Coulomb corrections for DIS
on nuclei is extremely difficult, it should be challenged rather than 'swept
under the carpet'. The importance of these radiative corrections is questioned
in present paper. We show that in the simplest case of a constant hadronic
current the Coulomb corrections provide a phase to the Born amplitude,
therefore the cross section remains the same. Inclusion of more realistic
hadronic dynamics changes this conclusion. The example of coherent production
of vector mesons off nuclei reveals large effects. So far a little progress has
been made deriving exact lepton wave functions in the Coulomb field of an
extended target. Employing available results based on the first-order
approximation in Z\alpha, we conclude that the Coulomb corrections are still
important for heavy nuclei. We also consider an alternative approach for
extended nuclear targets, the eikonal approximation, which we demonstrate to
reproduce the known exact results for Coulomb corrections. Calculating
electroproduction of vector mesons we again arrive at a large deviation from
the Born approximation. We conclude that one should accept with caution the
experimental results for nuclear effects in DIS based on analyses done in the
Born approximation.
| [
{
"created": "Sun, 13 May 2001 23:01:19 GMT",
"version": "v1"
},
{
"created": "Fri, 18 May 2001 18:44:36 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jul 2001 11:48:57 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Tarasov",
"A. V.",
""
],
[
"Voskresenskaya",
"O. O.",
""
]
] | The Born approximation, one photon exchange, used for DIS is subject to virtual radiative corrections which are related to the long-range Coulomb forces. They may be sizeable for heavy nuclei since Z\alpha is not a small parameter. So far these corrections are known only for two processes, elastic scattering and bremsstrahlung on the Coulomb field of a point-like target. While the former amplitude acquires only a phase, in the latter case the cross section is modified also. Although the problem of Coulomb corrections for DIS on nuclei is extremely difficult, it should be challenged rather than 'swept under the carpet'. The importance of these radiative corrections is questioned in present paper. We show that in the simplest case of a constant hadronic current the Coulomb corrections provide a phase to the Born amplitude, therefore the cross section remains the same. Inclusion of more realistic hadronic dynamics changes this conclusion. The example of coherent production of vector mesons off nuclei reveals large effects. So far a little progress has been made deriving exact lepton wave functions in the Coulomb field of an extended target. Employing available results based on the first-order approximation in Z\alpha, we conclude that the Coulomb corrections are still important for heavy nuclei. We also consider an alternative approach for extended nuclear targets, the eikonal approximation, which we demonstrate to reproduce the known exact results for Coulomb corrections. Calculating electroproduction of vector mesons we again arrive at a large deviation from the Born approximation. We conclude that one should accept with caution the experimental results for nuclear effects in DIS based on analyses done in the Born approximation. |
0909.2900 | Patrick J. Fox | Yang Bai and Patrick J. Fox | Resonant Dark Matter | 19 pages, 6 figures, 1 table; References added, minor typos
corrected, final version in JHEP | JHEP 0911:052,2009 | 10.1088/1126-6708/2009/11/052 | FERMILAB-PUB-09-415-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is usually assumed that dark matter direct detection is sensitive to a
large fraction of the dark matter (DM) velocity distribution. We propose an
alternative form of dark matter-nucleus scattering which only probes a narrow
range of DM velocities due to the existence of a resonance, a DM-nucleus bound
state, in the scattering - resonant dark matter (rDM). The scattering cross
section becomes highly element dependent, has increased modulation and as a
result can explain the DAMA/LIBRA results whilst not being in conflict with
other direct detection experiments. We describe a simple model that realizes
the dynamics of rDM, where the DM is the neutral component of a fermionic weak
triplet whose charged partners differ in mass by approximately 10 MeV.
| [
{
"created": "Wed, 16 Sep 2009 00:40:56 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 2009 21:54:40 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Bai",
"Yang",
""
],
[
"Fox",
"Patrick J.",
""
]
] | It is usually assumed that dark matter direct detection is sensitive to a large fraction of the dark matter (DM) velocity distribution. We propose an alternative form of dark matter-nucleus scattering which only probes a narrow range of DM velocities due to the existence of a resonance, a DM-nucleus bound state, in the scattering - resonant dark matter (rDM). The scattering cross section becomes highly element dependent, has increased modulation and as a result can explain the DAMA/LIBRA results whilst not being in conflict with other direct detection experiments. We describe a simple model that realizes the dynamics of rDM, where the DM is the neutral component of a fermionic weak triplet whose charged partners differ in mass by approximately 10 MeV. |
hep-ph/0001062 | Martin Beneke | M. Beneke (CERN), G.A. Schuler (CERN), S. Wolf (Karlsruhe) | Quarkonium momentum distributions in photoproduction and B decay | latex, 45 pages; (v2) some typos corrected, version to appear in PRD | Phys.Rev.D62:034004,2000 | 10.1103/PhysRevD.62.034004 | CERN-TH/99-356, TTP99-55 | hep-ph | null | According to our present understanding many $J/\psi$ production processes
proceed through a coloured $c\bar{c}$ state followed by the emission of soft
particles in the quarkonium rest frame. The kinematic effect of soft particle
emission is usually a higher-order effect in the non-relativistic expansion,
but becomes important near the kinematic endpoint of quarkonium energy
(momentum) distributions. In an intermediate region a systematic resummation of
the non-relativistic expansion leads to the introduction of so-called `shape
functions'. In this paper we provide an implementation of the kinematic effect
of soft gluon emission which is consistent with the non-relativistic shape
function formalism in the region where it is applicable and which models the
extreme endpoint region. We then apply the model to photoproduction of $J/\psi$
and $J/\psi$ production in $B$ meson decay. A satisfactory description of $B$
decay data is obtained. For inelastic charmonium photoproduction we conclude
that a sensible comparison of theory with data requires a transverse momentum
cut larger than the currently used 1 GeV.
| [
{
"created": "Mon, 10 Jan 2000 08:23:35 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2000 13:12:47 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Beneke",
"M.",
"",
"CERN"
],
[
"Schuler",
"G. A.",
"",
"CERN"
],
[
"Wolf",
"S.",
"",
"Karlsruhe"
]
] | According to our present understanding many $J/\psi$ production processes proceed through a coloured $c\bar{c}$ state followed by the emission of soft particles in the quarkonium rest frame. The kinematic effect of soft particle emission is usually a higher-order effect in the non-relativistic expansion, but becomes important near the kinematic endpoint of quarkonium energy (momentum) distributions. In an intermediate region a systematic resummation of the non-relativistic expansion leads to the introduction of so-called `shape functions'. In this paper we provide an implementation of the kinematic effect of soft gluon emission which is consistent with the non-relativistic shape function formalism in the region where it is applicable and which models the extreme endpoint region. We then apply the model to photoproduction of $J/\psi$ and $J/\psi$ production in $B$ meson decay. A satisfactory description of $B$ decay data is obtained. For inelastic charmonium photoproduction we conclude that a sensible comparison of theory with data requires a transverse momentum cut larger than the currently used 1 GeV. |
2007.04194 | Raghunath Sahoo | Suman Deb, Sushanta Tripathy, Golam Sarwar, Raghunath Sahoo, and Jan-e
Alam | Deciphering QCD dynamics in small collision systems using event shape
and final state multiplicity at the Large Hadron Collider | Same as the published version | Eur. Phys. J. A 56, 252 (2020) | 10.1140/epja/s10050-020-00258-x | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The high-multiplicity pp collisions at the Large Hadron Collider energies
with various heavy-ion-like signatures have warranted a deeper understanding of
the underlying physics and particle production mechanisms. It is a common
practice to use experimental data on the hadronic transverse momentum ($p_T$)
spectra to extract thermodynamical properties of the system formed in heavy ion
and high multiplicity pp collisions. The non-availability of event topology
dependent experimental data for pp collisions at $\sqrt{s}$ = 13 TeV on the
spectra of non-strange and strange hadrons constrains us to use the PYTHIA8
simulated numbers to extract temperature-like parameters to study the event
shape and multiplicity dependence of specific heat capacity, conformal symmetry
breaking measure (CSBM) and speed of sound. The observables show a clear
dependence on event multiplicity and event topology. Thermodynamics of the
system is largely governed by the light particles because of their relatively
larger abundances. In this regards, a threshold in the particle production,
$\rm N_{ch} \simeq$ (10-20) in the final state multiplicity emerges out from
the present study, confirming some of the earlier findings in this direction.
As for heavier hadrons with relatively small abundances, a similar threshold is
observed for $\langle \rm N_{ch} \rangle \simeq$ 40 hinting towards formation
of a thermal bath where all the heavier hadrons are in equilibrium.
| [
{
"created": "Wed, 8 Jul 2020 15:32:33 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2020 07:41:11 GMT",
"version": "v2"
}
] | 2020-10-08 | [
[
"Deb",
"Suman",
""
],
[
"Tripathy",
"Sushanta",
""
],
[
"Sarwar",
"Golam",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Alam",
"Jan-e",
""
]
] | The high-multiplicity pp collisions at the Large Hadron Collider energies with various heavy-ion-like signatures have warranted a deeper understanding of the underlying physics and particle production mechanisms. It is a common practice to use experimental data on the hadronic transverse momentum ($p_T$) spectra to extract thermodynamical properties of the system formed in heavy ion and high multiplicity pp collisions. The non-availability of event topology dependent experimental data for pp collisions at $\sqrt{s}$ = 13 TeV on the spectra of non-strange and strange hadrons constrains us to use the PYTHIA8 simulated numbers to extract temperature-like parameters to study the event shape and multiplicity dependence of specific heat capacity, conformal symmetry breaking measure (CSBM) and speed of sound. The observables show a clear dependence on event multiplicity and event topology. Thermodynamics of the system is largely governed by the light particles because of their relatively larger abundances. In this regards, a threshold in the particle production, $\rm N_{ch} \simeq$ (10-20) in the final state multiplicity emerges out from the present study, confirming some of the earlier findings in this direction. As for heavier hadrons with relatively small abundances, a similar threshold is observed for $\langle \rm N_{ch} \rangle \simeq$ 40 hinting towards formation of a thermal bath where all the heavier hadrons are in equilibrium. |
1401.0070 | Patipan Uttayarat | Benjam\'in Grinstein, Christopher W. Murphy, David Pirtskhalava and
Patipan Uttayarat | Theoretical Constraints on Additional Higgs Bosons in Light of the 126
GeV Higgs | 53 pages, 17 figures. Version 3: expanded references, matched JHEP
version | null | 10.1007/JHEP05(2014)083 | UCSD/PTH 13-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a sum rule for Higgs fields in general representations under
$SU(2)_L \times U(1)_Y$ that follows from the connection between the Higgs
couplings and the mechanism that gives the electroweak bosons their masses, and
at the same time restricts these couplings. Sum rules that follow from
perturbative unitarity will require us to include singly and doubly charged
Higgses in our analysis. We examine the consequences of these sum rules for
Higgs phenomenology in both model independent and model specific ways. The
relation between our sum rules and other works, based on dispersion relations,
is also clarified.
| [
{
"created": "Tue, 31 Dec 2013 01:59:33 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2014 19:02:22 GMT",
"version": "v2"
},
{
"created": "Tue, 20 May 2014 14:41:51 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Grinstein",
"Benjamín",
""
],
[
"Murphy",
"Christopher W.",
""
],
[
"Pirtskhalava",
"David",
""
],
[
"Uttayarat",
"Patipan",
""
]
] | We present a sum rule for Higgs fields in general representations under $SU(2)_L \times U(1)_Y$ that follows from the connection between the Higgs couplings and the mechanism that gives the electroweak bosons their masses, and at the same time restricts these couplings. Sum rules that follow from perturbative unitarity will require us to include singly and doubly charged Higgses in our analysis. We examine the consequences of these sum rules for Higgs phenomenology in both model independent and model specific ways. The relation between our sum rules and other works, based on dispersion relations, is also clarified. |
0907.5307 | Bryan Webber | Bryan Webber | Mass determination in sequential particle decay chains | 11 pages, 3 figures. Mention of application to shorter decay chains
and references added | JHEP 0909:124,2009 | 10.1088/1126-6708/2009/09/124 | Cavendish-HEP-09/13 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple method is proposed for determining the masses of new particles in
collider events containing a pair of decay chains (not necessarily identical)
of the form Z -> Y+1, Y -> X+2, X -> N+3, where 1,2 and 3 are visible but N is
not. Initial study of a possible supersymmetric case suggests that the method
can determine the four unknown masses in effectively identical chains with good
accuracy from samples of a few tens of events.
| [
{
"created": "Thu, 30 Jul 2009 10:42:52 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Sep 2009 02:20:42 GMT",
"version": "v2"
}
] | 2009-10-16 | [
[
"Webber",
"Bryan",
""
]
] | A simple method is proposed for determining the masses of new particles in collider events containing a pair of decay chains (not necessarily identical) of the form Z -> Y+1, Y -> X+2, X -> N+3, where 1,2 and 3 are visible but N is not. Initial study of a possible supersymmetric case suggests that the method can determine the four unknown masses in effectively identical chains with good accuracy from samples of a few tens of events. |
hep-ph/9701270 | Lori Paniak | L. D. Paniak, G. W. Semenoff and A. R. Zhitnitsky (University of
British Columbia) | Vacuum Structure of Two-Dimensional Gauge Theories for Arbitrary Lie
Groups | 16 pages, LaTeX, one table, uses epsf | Nucl.Phys. B506 (1997) 521-536 | 10.1016/S0550-3213(97)00536-1 | null | hep-ph | null | Using the well established machinery of Wilson loop calculations we
investigate the multiple vacua of two dimensional Yang-Mills theories with
infinitely massive adjoint matter. In particular, via group theoretical
techniques we calculate string tensions between charges and find the number of
vacua for each compact Lie symmetry group. The counting of vacua is in
agreement with the standard classification based on the topology of the
effective gauge group $\pi_1(G/Z)$ when one considers arbitrary numbers of
adjoint charges in the system. For systems with limited numbers of charges we
find additional "meta-stable" vacuum states. Finally we discuss t'Hooft's
disorder operators in this setting as number operators for the multiple vacua.
| [
{
"created": "Sun, 12 Jan 1997 02:27:20 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Paniak",
"L. D.",
"",
"University of\n British Columbia"
],
[
"Semenoff",
"G. W.",
"",
"University of\n British Columbia"
],
[
"Zhitnitsky",
"A. R.",
"",
"University of\n British Columbia"
]
] | Using the well established machinery of Wilson loop calculations we investigate the multiple vacua of two dimensional Yang-Mills theories with infinitely massive adjoint matter. In particular, via group theoretical techniques we calculate string tensions between charges and find the number of vacua for each compact Lie symmetry group. The counting of vacua is in agreement with the standard classification based on the topology of the effective gauge group $\pi_1(G/Z)$ when one considers arbitrary numbers of adjoint charges in the system. For systems with limited numbers of charges we find additional "meta-stable" vacuum states. Finally we discuss t'Hooft's disorder operators in this setting as number operators for the multiple vacua. |
hep-ph/0305008 | Anne-Christine Davis | A.C. Davis | Cosmic Defects and Particle Physics Constraints | Invited Lectures at the NATO/ESF Summer School on Patterns of
Symmetry Breaking, Krakow, September 2002. To be published in the Proceedings | null | null | null | hep-ph | null | In these lectures we review the constraints on particle physics models
arising from cosmic defects. This includes constraints on theories where stable
cosmic string loops, or vortons result. These can arise in supersymmetric
theories. We discuss the possibility of embedded defects being stabilised by
the surrounding plasma, and the constraints imposed on such theories by the
microwave background data. Finally, dilaton constraints are considered.
| [
{
"created": "Thu, 1 May 2003 13:43:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Davis",
"A. C.",
""
]
] | In these lectures we review the constraints on particle physics models arising from cosmic defects. This includes constraints on theories where stable cosmic string loops, or vortons result. These can arise in supersymmetric theories. We discuss the possibility of embedded defects being stabilised by the surrounding plasma, and the constraints imposed on such theories by the microwave background data. Finally, dilaton constraints are considered. |
0806.1971 | Michael Trott | Benjamin Grinstein, Michael Trott | Electroweak Baryogenesis with a Pseudo-Goldstone Higgs | 28 pages, 12 Figures V3: ref added | Phys.Rev.D78:075022,2008 | 10.1103/PhysRevD.78.075022 | UCSD/PTH 08-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the nature of electroweak Baryogenesis when the Higgs boson's
properties are modified by the effects of new physics. We utilize the effective
potential to one loop (ring improving the finite temperature perturbative
expansion) while retaining parametrically enhanced dimension six operators of
O(v^2/f^2) in the Higgs sector. These parametrically enhanced operators would
be present if the Higgs is a pseudo-goldstone boson of a new physics sector
with a characteristic mass scale Lambda ~ TeV, a coupling constant (4 pi) > g >
1 and a strong decay constant scale f = Lambda/g. We find that generically the
effect of new physics of this form allows a sufficiently first order
electro-weak phase transition so that the produced Baryon number can avoid
washing out, and has enhanced effects due to new sources CP violation. We also
improve the description of the electroweak phase transition in perturbation
theory by determining the thermal mass eigenstate basis of the standard model
gauge boson fields. This improves the calculation of the finite temperature
effects through incorporating mixing in the determination of the vector boson
thermal masses of the standard model. These effects are essential to
determining the nature of the phase transition in the standard model and are of
interest in our Pseudo-Goldstone Baryogenesis scenario.
| [
{
"created": "Thu, 12 Jun 2008 17:39:19 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 2008 22:32:56 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Feb 2009 21:41:52 GMT",
"version": "v3"
}
] | 2009-02-25 | [
[
"Grinstein",
"Benjamin",
""
],
[
"Trott",
"Michael",
""
]
] | We examine the nature of electroweak Baryogenesis when the Higgs boson's properties are modified by the effects of new physics. We utilize the effective potential to one loop (ring improving the finite temperature perturbative expansion) while retaining parametrically enhanced dimension six operators of O(v^2/f^2) in the Higgs sector. These parametrically enhanced operators would be present if the Higgs is a pseudo-goldstone boson of a new physics sector with a characteristic mass scale Lambda ~ TeV, a coupling constant (4 pi) > g > 1 and a strong decay constant scale f = Lambda/g. We find that generically the effect of new physics of this form allows a sufficiently first order electro-weak phase transition so that the produced Baryon number can avoid washing out, and has enhanced effects due to new sources CP violation. We also improve the description of the electroweak phase transition in perturbation theory by determining the thermal mass eigenstate basis of the standard model gauge boson fields. This improves the calculation of the finite temperature effects through incorporating mixing in the determination of the vector boson thermal masses of the standard model. These effects are essential to determining the nature of the phase transition in the standard model and are of interest in our Pseudo-Goldstone Baryogenesis scenario. |
1907.03229 | Xiao-Ming Xu | Wan-Xia Li, Xiao-Ming Xu, H. J. Weber | Cross sections for 2-to-3 meson-meson scattering | 43 pages, 11 figures, 4 tables, LaTeX; more discussions added | Phys. Rev. D 101, 014025 (2020) | 10.1103/PhysRevD.101.014025 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study 2-to-3 meson-meson scattering based on the process that a gluon is
created from a constituent quark or antiquark and subsequently the gluon
creates a quark-antiquark pair. The transition potential for the process is
derived in QCD. Eight Feynman diagrams at tree level are involved in the 2-to-3
meson-meson scattering. Starting from the $S$-matrix element, we derive the
unpolarized cross section from the eight transition amplitudes corresponding to
the eight Feynman diagrams. The transition amplitudes contain color, spin, and
flavor matrix elements. The 2-to-3 meson-meson scattering includes $\pi \pi \to
\pi K\bar{K}$, $\pi K \to \pi \pi K$, $\pi K \to KK\bar{K}$, $KK \to \pi KK$,
and $K\bar{K} \to \pi K\bar{K}$. Cross sections for the reactions are
calculated. The cross sections depend on temperature obviously, and the cross
section for $\pi K \to \pi\pi K$ for total isospin $I=3/2$ at zero temperature
is compared to experimental data. By comparison with inelastic 2-to-2
meson-meson scattering, we find that 2-to-3 meson-meson scattering may be as
important as inelastic 2-to-2 meson-meson scattering.
| [
{
"created": "Sun, 7 Jul 2019 06:15:54 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Feb 2020 06:05:54 GMT",
"version": "v2"
}
] | 2020-02-11 | [
[
"Li",
"Wan-Xia",
""
],
[
"Xu",
"Xiao-Ming",
""
],
[
"Weber",
"H. J.",
""
]
] | We study 2-to-3 meson-meson scattering based on the process that a gluon is created from a constituent quark or antiquark and subsequently the gluon creates a quark-antiquark pair. The transition potential for the process is derived in QCD. Eight Feynman diagrams at tree level are involved in the 2-to-3 meson-meson scattering. Starting from the $S$-matrix element, we derive the unpolarized cross section from the eight transition amplitudes corresponding to the eight Feynman diagrams. The transition amplitudes contain color, spin, and flavor matrix elements. The 2-to-3 meson-meson scattering includes $\pi \pi \to \pi K\bar{K}$, $\pi K \to \pi \pi K$, $\pi K \to KK\bar{K}$, $KK \to \pi KK$, and $K\bar{K} \to \pi K\bar{K}$. Cross sections for the reactions are calculated. The cross sections depend on temperature obviously, and the cross section for $\pi K \to \pi\pi K$ for total isospin $I=3/2$ at zero temperature is compared to experimental data. By comparison with inelastic 2-to-2 meson-meson scattering, we find that 2-to-3 meson-meson scattering may be as important as inelastic 2-to-2 meson-meson scattering. |
hep-ph/9802377 | Raul Horvat | R. Horvat | Medium effects in string-dilaton-induced neutrino oscillations | 7 pages, a discussion on atmospheric neutrinos has been added, to
appear in Phys. Rev. D | Phys. Rev. D 58, 125020 (1998) | 10.1103/PhysRevD.58.125020 | IRB-ZEF-98/19 | hep-ph | null | We consider the unconventional way to interpret the current data on solar
neutrino oscillations as derived recently by Halprin and Leung from a string
model based on the existence of the string dilaton field which remains massless
in the low-energy world. The equivalence principle violation entailed by the
existence of a massless dilaton may then produce neutrino oscillations even for
neutrinos that are degenerate in mass. Here we calculate the medium-induced
mass squared difference for solar neutrinos, which is due to their coherent
interactions with the cosmic neutrino background and with solar plasma
constituents. We show that this difference can naturally be large enough to
satisfy the known experimental limits on the Just So solution as well as on the
MSW solution of the solar neutrino problem.
| [
{
"created": "Fri, 20 Feb 1998 16:10:39 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 1998 09:21:28 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Horvat",
"R.",
""
]
] | We consider the unconventional way to interpret the current data on solar neutrino oscillations as derived recently by Halprin and Leung from a string model based on the existence of the string dilaton field which remains massless in the low-energy world. The equivalence principle violation entailed by the existence of a massless dilaton may then produce neutrino oscillations even for neutrinos that are degenerate in mass. Here we calculate the medium-induced mass squared difference for solar neutrinos, which is due to their coherent interactions with the cosmic neutrino background and with solar plasma constituents. We show that this difference can naturally be large enough to satisfy the known experimental limits on the Just So solution as well as on the MSW solution of the solar neutrino problem. |
1607.07179 | Maxim Goryachev | M. Goryachev, A. Lo, Ph. Haslinger, E. Mizrachi, L. Anderegg, H.
M\"uller, M. Hohensee, M.E. Tobar | Acoustic tests of Lorentz symmetry using Bulk Acoustic Wave quartz
oscillators | Presented at the Seventh Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 20-24, 2016 | null | null | null | hep-ph physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new method of probing Lorentz invariance in the neutron sector is
described. The method is baed on stable quartz bulk acoustic wave oscillators
compared on a rotating table. Due to Lorentz-invariance violation, the
resonance frequencies of acoustic wave resonators depend on the direction in
space via a corresponding dependence of masses of the constituent elements of
solids. This dependence is measured via observation of oscillator phase noise
built around such devices. The first such experiment now shows sensitivity to
violation down to the limit $\tilde{c}^n_Q=(-1.8\pm2.2)\times 10^{-14}$ GeV.
Methods to improve the sensitivity are described together with some other
applications of the technology in tests of fundamental physics.
| [
{
"created": "Mon, 25 Jul 2016 08:23:43 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Aug 2016 20:09:29 GMT",
"version": "v2"
}
] | 2016-08-09 | [
[
"Goryachev",
"M.",
""
],
[
"Lo",
"A.",
""
],
[
"Haslinger",
"Ph.",
""
],
[
"Mizrachi",
"E.",
""
],
[
"Anderegg",
"L.",
""
],
[
"Müller",
"H.",
""
],
[
"Hohensee",
"M.",
""
],
[
"Tobar",
"M. E.",... | A new method of probing Lorentz invariance in the neutron sector is described. The method is baed on stable quartz bulk acoustic wave oscillators compared on a rotating table. Due to Lorentz-invariance violation, the resonance frequencies of acoustic wave resonators depend on the direction in space via a corresponding dependence of masses of the constituent elements of solids. This dependence is measured via observation of oscillator phase noise built around such devices. The first such experiment now shows sensitivity to violation down to the limit $\tilde{c}^n_Q=(-1.8\pm2.2)\times 10^{-14}$ GeV. Methods to improve the sensitivity are described together with some other applications of the technology in tests of fundamental physics. |
1709.01262 | George W. S. Hou | George W.-S. Hou | ElectroWeak BaryoGenesis via Top Transport | 5 pages, 3 figures, to appear in proceedings of EPS-HEP2017 held July
2017 in Venice | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study electroweak baryogenesis driven by the top quark in two Higgs
doublet model that allows flavor-changing neutral Higgs couplings. Taking Higgs
sector couplings and the additional top Yukawa coupling $\rho_{tt}$ to be
$\mathcal{O}$(1), one naturally has first order electroweak phase transition
and sufficient $CP$ violation to fuel the cosmic baryon asymmetry. Even if
$\rho_{tt}$ vanishes, the favor-changing coupling $\rho_{tc}$ can still achieve
baryogenesis. Phenomenological consequences such as $t\to ch$, $\tau \to
\mu\gamma$, electron electric dipole moment, $h\to\gamma\gamma$, and $hhh$
coupling are discussed. The extra scalars $H^0$, $A^0$ and $H^\pm$ are sub-TeV
in mass, and can be searched for at the LHC.
| [
{
"created": "Tue, 5 Sep 2017 07:11:41 GMT",
"version": "v1"
}
] | 2017-09-06 | [
[
"Hou",
"George W. -S.",
""
]
] | We study electroweak baryogenesis driven by the top quark in two Higgs doublet model that allows flavor-changing neutral Higgs couplings. Taking Higgs sector couplings and the additional top Yukawa coupling $\rho_{tt}$ to be $\mathcal{O}$(1), one naturally has first order electroweak phase transition and sufficient $CP$ violation to fuel the cosmic baryon asymmetry. Even if $\rho_{tt}$ vanishes, the favor-changing coupling $\rho_{tc}$ can still achieve baryogenesis. Phenomenological consequences such as $t\to ch$, $\tau \to \mu\gamma$, electron electric dipole moment, $h\to\gamma\gamma$, and $hhh$ coupling are discussed. The extra scalars $H^0$, $A^0$ and $H^\pm$ are sub-TeV in mass, and can be searched for at the LHC. |
1112.4491 | Jong-Chul Park | Genevieve Belanger and Jong-Chul Park | Assisted freeze-out | 16 pages, 13 figures, minor corrections, the final version published
in JCAP | JCAP 1203(2012)038 | 10.1088/1475-7516/2012/03/038 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a class of dark matter models with two dark matter candidates,
only one interacts with the standard model sector. One of the dark matter is
thermalized with the assistance of the other stable particle. While both stable
particles contribute to the total relic density only one can elastically
scatter with nuclei, thus effectively reducing the direct detection rate.
| [
{
"created": "Mon, 19 Dec 2011 21:02:23 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2012 13:24:51 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Belanger",
"Genevieve",
""
],
[
"Park",
"Jong-Chul",
""
]
] | We explore a class of dark matter models with two dark matter candidates, only one interacts with the standard model sector. One of the dark matter is thermalized with the assistance of the other stable particle. While both stable particles contribute to the total relic density only one can elastically scatter with nuclei, thus effectively reducing the direct detection rate. |
1911.01639 | Noboru Sasao | M. Tashiro, B. P. Das, J. Ekman, P. Jonsson, N. Sasao and M. Yoshimura | Macro-coherent radiative emission of neutrino pair between parity-even
atomic states | 6 pages, 3 figures | null | 10.1140/epjc/s10052-019-7430-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new scheme to determine the neutrino mass matrix is proposed using atomic
de-excitation between two states of a few eV energy spacing. The determination
of the smallest neutrino mass of the order of 1 meV and neutrino mass type,
Majorana or Dirac, becomes possible, if one can coherently excite more than 1
gram of atoms using two lasers.
| [
{
"created": "Tue, 5 Nov 2019 06:27:00 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Tashiro",
"M.",
""
],
[
"Das",
"B. P.",
""
],
[
"Ekman",
"J.",
""
],
[
"Jonsson",
"P.",
""
],
[
"Sasao",
"N.",
""
],
[
"Yoshimura",
"M.",
""
]
] | A new scheme to determine the neutrino mass matrix is proposed using atomic de-excitation between two states of a few eV energy spacing. The determination of the smallest neutrino mass of the order of 1 meV and neutrino mass type, Majorana or Dirac, becomes possible, if one can coherently excite more than 1 gram of atoms using two lasers. |
hep-ph/9504276 | null | Andr\'e Martin, Jean-Marc Richard | $\Omega_c$ and other charmed baryons revisited | 6 pages, latex | Phys.Lett. B355 (1995) 345-348 | 10.1016/0370-2693(95)00704-O | CERN-TH/95-86 | hep-ph | null | The mass of the $\Omega^0_c$ baryon with quark content (ssc) is computed in a
potential model whose parameters have been determined in 1981 by fitting the
spectrum of heavy mesons. It is found in perfect agreement with a recent
measurement at the CERN hyperon-beam experiment. The spectroscopy of other
charmed baryons in potential models is briefly reviewed.
| [
{
"created": "Mon, 10 Apr 1995 09:27:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Martin",
"André",
""
],
[
"Richard",
"Jean-Marc",
""
]
] | The mass of the $\Omega^0_c$ baryon with quark content (ssc) is computed in a potential model whose parameters have been determined in 1981 by fitting the spectrum of heavy mesons. It is found in perfect agreement with a recent measurement at the CERN hyperon-beam experiment. The spectroscopy of other charmed baryons in potential models is briefly reviewed. |
1103.5445 | Zvi Bern | Z. Bern, G. Diana, L.J. Dixon, F. Febres Cordero, D. Forde, T.
Gleisberg, S. Hoeche, H. Ita, D. A. Kosower, D. Maitre and K. Ozeren | Left-Handed W Bosons at the LHC | 32 pages, revtex, 17 figures, 3 tables, v2 minor corrections to ME+PS
results, no changes to conclusions, added references | Phys.Rev.D84:034008,2011 | 10.1103/PhysRevD.84.034008 | SLAC-PUB-14409, CERN-PH-TH/2011-062,,UCLA/11/TEP/10, SB/F/386-11,
NIKHEF-2011-006, Saclay-IPhT-T11/040, IPPP/11/15 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of W bosons in association with jets is an important
background to new physics at the LHC. Events in which the W carries large
transverse momentum and decays leptonically lead to large missing energy and
are of particular importance. We show that the left-handed nature of the W
coupling, combined with valence quark domination at a pp machine, leads to a
large left-handed polarization for both W^+ and W^- bosons at large transverse
momenta. The polarization fractions are very stable with respect to QCD
corrections. The leptonic decay of the W bosons translates the common
left-handed polarization into a strong asymmetry in transverse momentum
distributions between positrons and electrons, and between neutrinos and
anti-neutrinos (missing transverse energy). Such asymmetries may provide an
effective experimental handle on separating W + jets from top quark production,
which exhibits very little asymmetry due to C invariance, and from various
types of new physics.
| [
{
"created": "Mon, 28 Mar 2011 19:06:28 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Apr 2011 01:32:51 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Bern",
"Z.",
""
],
[
"Diana",
"G.",
""
],
[
"Dixon",
"L. J.",
""
],
[
"Cordero",
"F. Febres",
""
],
[
"Forde",
"D.",
""
],
[
"Gleisberg",
"T.",
""
],
[
"Hoeche",
"S.",
""
],
[
"Ita",
"H.",
... | The production of W bosons in association with jets is an important background to new physics at the LHC. Events in which the W carries large transverse momentum and decays leptonically lead to large missing energy and are of particular importance. We show that the left-handed nature of the W coupling, combined with valence quark domination at a pp machine, leads to a large left-handed polarization for both W^+ and W^- bosons at large transverse momenta. The polarization fractions are very stable with respect to QCD corrections. The leptonic decay of the W bosons translates the common left-handed polarization into a strong asymmetry in transverse momentum distributions between positrons and electrons, and between neutrinos and anti-neutrinos (missing transverse energy). Such asymmetries may provide an effective experimental handle on separating W + jets from top quark production, which exhibits very little asymmetry due to C invariance, and from various types of new physics. |
hep-ph/9905305 | Gerhard Schuler | F.E. Close and G.A. Schuler | Evidence that the Pomeron transforms as a non-conserved vector current | 12 pages, latex, 4 figures | Phys.Lett. B464 (1999) 279-285 | 10.1016/S0370-2693(99)00875-8 | CERN-TH/99-131 | hep-ph | null | The detailed dependences of central meson production on the azimuthal angle
phi, t and the meson J^P are shown to be consistent with the hypothesis that
the soft Pomeron transforms as a non-conserved vector current. Further tests
are proposed. This opens the way for a quantitative description of q-qbar and
glueball production in p p -> p M p.
| [
{
"created": "Tue, 11 May 1999 15:50:41 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Close",
"F. E.",
""
],
[
"Schuler",
"G. A.",
""
]
] | The detailed dependences of central meson production on the azimuthal angle phi, t and the meson J^P are shown to be consistent with the hypothesis that the soft Pomeron transforms as a non-conserved vector current. Further tests are proposed. This opens the way for a quantitative description of q-qbar and glueball production in p p -> p M p. |
1811.10793 | Ursula Laa | Bernat Capdevila, Ursula Laa, German Valencia | Anatomy of a six-parameter fit to the $b\to s \ell^+\ell^-$ anomalies | 39 pages, 14 figures, journal version, animations referenced in the
text are available at https://uschilaa.github.io/animations/ | null | 10.1140/epjc/s10052-019-6944-8 | null | hep-ph hep-ex physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discrepancies between measurements of decay modes with an underlying quark
level transition $b\to s \ell^+\ell^-$ and standard model (SM) predictions have
persisted for several years, particularly for the muon channels. The inadequacy
of the SM becomes more compelling in a global fit. For example, Ref. [1]
described 175 observables by six parameters encoding new physics and quantified
the disagreement with the SM at about the $5\sigma$ level. While certain one
and two parameter fits have previously been considered in detail, we establish
a framework for the detailed discussion of the full 6d fit. We visualize and
quantify the 6d $1\sigma$ region around the best fit point and define fit
uncertainties for both current and future observables. We then define metrics
quantifying the deviations between measurements and both SM and best fit
predictions. These metrics relate observables to directions in parameter space,
revealing their precise role in the fit, thus providing guidance for future
theoretical and experimental work. Some metrics further quantify the role of
correlated uncertainties, which turns out to be significant. For example the
relevance of angular observables such as $P_5^\prime$ is reduced in this
context. Finally, studying the space of observables allows us to discuss the
internal tensions in the fit.
| [
{
"created": "Tue, 27 Nov 2018 03:55:02 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 22:51:11 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Capdevila",
"Bernat",
""
],
[
"Laa",
"Ursula",
""
],
[
"Valencia",
"German",
""
]
] | Discrepancies between measurements of decay modes with an underlying quark level transition $b\to s \ell^+\ell^-$ and standard model (SM) predictions have persisted for several years, particularly for the muon channels. The inadequacy of the SM becomes more compelling in a global fit. For example, Ref. [1] described 175 observables by six parameters encoding new physics and quantified the disagreement with the SM at about the $5\sigma$ level. While certain one and two parameter fits have previously been considered in detail, we establish a framework for the detailed discussion of the full 6d fit. We visualize and quantify the 6d $1\sigma$ region around the best fit point and define fit uncertainties for both current and future observables. We then define metrics quantifying the deviations between measurements and both SM and best fit predictions. These metrics relate observables to directions in parameter space, revealing their precise role in the fit, thus providing guidance for future theoretical and experimental work. Some metrics further quantify the role of correlated uncertainties, which turns out to be significant. For example the relevance of angular observables such as $P_5^\prime$ is reduced in this context. Finally, studying the space of observables allows us to discuss the internal tensions in the fit. |
hep-ph/0505071 | Susan Gardner | Susan Gardner | Towards a Precision Determination of alpha in B \to pi pi Decays | 17 pages, REVTeX, 1 eps figure; some results altered, conclusions
unchanged | Phys.Rev. D72 (2005) 034015 | 10.1103/PhysRevD.72.034015 | null | hep-ph hep-ex nucl-th | null | An assumption of isospin symmetry permits the determination of sin(2 alpha)
from the experimental study of B\to pi pi decays. Isospin, however, is merely
an approximate symmetry; its breaking predicates a theoretical systematical
error sigma_\alpha^{\rm IB} in the extraction of alpha. We focus on the impact
of \pi^0-\eta,\eta^\prime mixing, as well as the manner in which it is amenable
to empirical constraint, and determine that \sigma_\alpha^{\rm IB} can
potentially be controlled to {\cal O}(1^\circ).
| [
{
"created": "Tue, 10 May 2005 15:34:03 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2005 23:06:12 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Gardner",
"Susan",
""
]
] | An assumption of isospin symmetry permits the determination of sin(2 alpha) from the experimental study of B\to pi pi decays. Isospin, however, is merely an approximate symmetry; its breaking predicates a theoretical systematical error sigma_\alpha^{\rm IB} in the extraction of alpha. We focus on the impact of \pi^0-\eta,\eta^\prime mixing, as well as the manner in which it is amenable to empirical constraint, and determine that \sigma_\alpha^{\rm IB} can potentially be controlled to {\cal O}(1^\circ). |
hep-ph/9307204 | null | Edi Halyo | Technidilaton Phenomenology and Prospects for Production | WIS-93/21/JUN-PH, 30 pages in phyzzx.tex, 2 tables in tables.tex and
5 figures | Int.J.Mod.Phys. A9 (1994) 1849-1872 | 10.1142/S0217751X94000790 | null | hep-ph | null | An effective Lagrangian for the technidilaton and its interactions with
matter is constructed. Properties of the technidilaton are compared with those
of the Higgs boson. Technidilaton decays and production channels are
investigated. Main technidilaton decays are suppressed compared to the Higgs
boson and the most important production mechanism is due to gluon fusion.
Prospects for technidilaton production and detection at $e^+e^-$ colliders and
the SSC are examined. LEP 1, LEP 2 and SSC can find or rule out a technidilaton
with a mass up to $10~GeV$, $40~GeV$ and $230~GeV$ respectively.
| [
{
"created": "Thu, 1 Jul 1993 17:02:07 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 1993 14:37:29 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Halyo",
"Edi",
""
]
] | An effective Lagrangian for the technidilaton and its interactions with matter is constructed. Properties of the technidilaton are compared with those of the Higgs boson. Technidilaton decays and production channels are investigated. Main technidilaton decays are suppressed compared to the Higgs boson and the most important production mechanism is due to gluon fusion. Prospects for technidilaton production and detection at $e^+e^-$ colliders and the SSC are examined. LEP 1, LEP 2 and SSC can find or rule out a technidilaton with a mass up to $10~GeV$, $40~GeV$ and $230~GeV$ respectively. |
1009.1665 | Joshua T. Ruderman | Joshua T. Ruderman and David Shih | Slepton co-NLSPs at the Tevatron | 31 pages + appendices, published version, references added | JHEP 1011:046,2010 | 10.1007/JHEP11(2010)046 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Tevatron signatures of promptly-decaying slepton co-NLSPs in the
context of General Gauge Mediation (GGM). The signatures consist of trileptons
plus MET and same-sign dileptons plus MET. Focusing first on electroweak
production, where the Tevatron has an advantage over the early LHC, we
establish four simple benchmark scenarios within the parameter space of GGM
which qualitatively capture all the relevant phenomenology. We derive limits on
these benchmarks from existing searches, estimate the discovery potential with
10 fb^-1, and discuss ways in which these searches can be optimized for slepton
co-NLSPs. We also analyze the Tevatron constraints on a scenario with light
gluinos that could be discovered at the early LHC. Overall, we find that the
Tevatron still has excellent reach for the discovery of SUSY in multilepton
final states. Finally, we comment on the possible interpretation of a mild
"excess" in the CDF same-sign dilepton search in terms of slepton co-NLSPs.
| [
{
"created": "Thu, 9 Sep 2010 01:29:59 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Dec 2010 05:48:45 GMT",
"version": "v2"
}
] | 2010-12-21 | [
[
"Ruderman",
"Joshua T.",
""
],
[
"Shih",
"David",
""
]
] | We study the Tevatron signatures of promptly-decaying slepton co-NLSPs in the context of General Gauge Mediation (GGM). The signatures consist of trileptons plus MET and same-sign dileptons plus MET. Focusing first on electroweak production, where the Tevatron has an advantage over the early LHC, we establish four simple benchmark scenarios within the parameter space of GGM which qualitatively capture all the relevant phenomenology. We derive limits on these benchmarks from existing searches, estimate the discovery potential with 10 fb^-1, and discuss ways in which these searches can be optimized for slepton co-NLSPs. We also analyze the Tevatron constraints on a scenario with light gluinos that could be discovered at the early LHC. Overall, we find that the Tevatron still has excellent reach for the discovery of SUSY in multilepton final states. Finally, we comment on the possible interpretation of a mild "excess" in the CDF same-sign dilepton search in terms of slepton co-NLSPs. |
2003.08828 | Madhurima Pandey | Madhurima Pandey, Avik Paul | Gravitational Wave Emissions from First Order Phase Transitions with Two
Component FIMP Dark Matter | 23 LaTeX pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the emissions of the Gravitational Waves (GWs) from a strong
first-order ekectroweak phase transition. To this end, a dark matter model has
been investigated in Feebly Interacting Massive Particle (FIMP) scenario, where
the dark matter particles are produced through "freeze-in" mechanism in the
early Universe and due to their very small couplings they could not attain
thermal and chemical equilibrium with the Universe's thermal plasma. In this
context, we extend scalar sector of Standard Model of particle physics by two
additional scalar singlets whose stability is protected by an unbroken discrete
$Z_2 \times Z'_2$ symmetry and they are assumed to develop no VEV after
spontaneous symmetry breaking. We study the first-order phase transition within
the framework of this present model. We have done both analytical and numerical
computations to calculate the consequent production of GWs and then the
detectabilities of such GWs have been investigated at the future space based
detectors such as LISA, BBO, ALIA, DECIGO, aLIGO and aLIGO+ etc. We also find
that dark matter self coupling has a considerable influence on the GW
production in the present scenario.
| [
{
"created": "Thu, 19 Mar 2020 14:42:25 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 2020 15:45:22 GMT",
"version": "v2"
}
] | 2020-03-24 | [
[
"Pandey",
"Madhurima",
""
],
[
"Paul",
"Avik",
""
]
] | We explore the emissions of the Gravitational Waves (GWs) from a strong first-order ekectroweak phase transition. To this end, a dark matter model has been investigated in Feebly Interacting Massive Particle (FIMP) scenario, where the dark matter particles are produced through "freeze-in" mechanism in the early Universe and due to their very small couplings they could not attain thermal and chemical equilibrium with the Universe's thermal plasma. In this context, we extend scalar sector of Standard Model of particle physics by two additional scalar singlets whose stability is protected by an unbroken discrete $Z_2 \times Z'_2$ symmetry and they are assumed to develop no VEV after spontaneous symmetry breaking. We study the first-order phase transition within the framework of this present model. We have done both analytical and numerical computations to calculate the consequent production of GWs and then the detectabilities of such GWs have been investigated at the future space based detectors such as LISA, BBO, ALIA, DECIGO, aLIGO and aLIGO+ etc. We also find that dark matter self coupling has a considerable influence on the GW production in the present scenario. |
1102.2772 | Bernd-Jochen Schaefer | Bernd-Jochen Schaefer | Fluctuations and the QCD phase diagram | 7 pages, 3 figures, to appear in Physics of Atomic Nuclei | null | 10.1134/S1063778812060270 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution the role of quantum fluctuations for the QCD phase
diagram is discussed. This concerns in particular the importance of the matter
back-reaction to the gluonic sector. The impact of these fluctuations on the
location of the confinement/deconfinement and the chiral transition lines as
well as their interrelation are investigated. Consequences of our findings for
the size of a possible quarkyonic phase and location of a critical endpoint in
the phase diagram are drawn.
| [
{
"created": "Mon, 14 Feb 2011 13:54:44 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Schaefer",
"Bernd-Jochen",
""
]
] | In this contribution the role of quantum fluctuations for the QCD phase diagram is discussed. This concerns in particular the importance of the matter back-reaction to the gluonic sector. The impact of these fluctuations on the location of the confinement/deconfinement and the chiral transition lines as well as their interrelation are investigated. Consequences of our findings for the size of a possible quarkyonic phase and location of a critical endpoint in the phase diagram are drawn. |
1308.1742 | Ian Lewis | Ian M. Lewis | Closing the Wedge with 300 fb^-1 and 3000 fb^-1 at the LHC: A Snowmass
White Paper | 5 pages, 2 figures, white paper for Snowmass 2013 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a Higgs boson at the LHC begins the era of directly
measuring the mechanism of electroweak symmetry breaking (EWSB). Searching for
extensions of the Standard Model (SM) EWSB sector at the LHC is of vital
importance. An important extension of the SM with an extended EWSB sector is
the Minimal Supersymmetric Standard Model (MSSM). In this white paper, we
extend current ATLAS and CMS bounds on direct searches for the heavy MSSM
neutral Higgs bosons to 300 fb^-1 and 3000 fb^-1 of data at the LHC. In
particular we focus on the \tau^+\tau^- channel and the pseudoscalar decay to
light Higgs boson and Z, with additional discussion on how to further close the
wedge.
| [
{
"created": "Thu, 8 Aug 2013 03:27:24 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Lewis",
"Ian M.",
""
]
] | The discovery of a Higgs boson at the LHC begins the era of directly measuring the mechanism of electroweak symmetry breaking (EWSB). Searching for extensions of the Standard Model (SM) EWSB sector at the LHC is of vital importance. An important extension of the SM with an extended EWSB sector is the Minimal Supersymmetric Standard Model (MSSM). In this white paper, we extend current ATLAS and CMS bounds on direct searches for the heavy MSSM neutral Higgs bosons to 300 fb^-1 and 3000 fb^-1 of data at the LHC. In particular we focus on the \tau^+\tau^- channel and the pseudoscalar decay to light Higgs boson and Z, with additional discussion on how to further close the wedge. |
0905.2889 | Zhang He | Michal Malinsky, Tommy Ohlsson, Zhi-zhong Xing, and He Zhang | Non-unitary neutrino mixing and CP violation in the minimal inverse
seesaw model | 19 pages, 4 figures, version to appear in PLB | Phys.Lett.B679:242-248,2009 | 10.1016/j.physletb.2009.07.038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simplified version of the inverse seesaw model, in which only
two pairs of the gauge-singlet neutrinos are introduced, to interpret the
observed neutrino mass hierarchy and lepton flavor mixing at or below the TeV
scale. This minimal inverse seesaw scenario (MISS) is technically natural and
experimentally testable. In particular, we show that the effective parameters
describing the non-unitary neutrino mixing matrix are strongly correlated in
the MISS, and thus, their upper bounds can be constrained by current
experimental data in a more restrictive way. The Jarlskog invariants of
non-unitary CP violation are calculated, and the discovery potential of such
new CP-violating effects in the near detector of a neutrino factory is
discussed.
| [
{
"created": "Mon, 18 May 2009 14:10:07 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2009 11:50:35 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Malinsky",
"Michal",
""
],
[
"Ohlsson",
"Tommy",
""
],
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhang",
"He",
""
]
] | We propose a simplified version of the inverse seesaw model, in which only two pairs of the gauge-singlet neutrinos are introduced, to interpret the observed neutrino mass hierarchy and lepton flavor mixing at or below the TeV scale. This minimal inverse seesaw scenario (MISS) is technically natural and experimentally testable. In particular, we show that the effective parameters describing the non-unitary neutrino mixing matrix are strongly correlated in the MISS, and thus, their upper bounds can be constrained by current experimental data in a more restrictive way. The Jarlskog invariants of non-unitary CP violation are calculated, and the discovery potential of such new CP-violating effects in the near detector of a neutrino factory is discussed. |
hep-ph/0604081 | Nikolaos Mavromatos | Nick E. Mavromatos (King's Coll. London) and Sarben Sarkar (king's
Coll. London) | A Possible Quantum-Gravitational Origin of the Neutrino Mass Difference
? | 17 pages latex, uses special macros, two eps figures incorporated.
Invited talk (N.E.M.) at the III International Workshop on Neutrino
Oscillations in Venice (NO-VE) 2006, 50 years from the Neutrino Experimental
Discovery, Venice (Italy), February 7-10 2006 | null | null | null | hep-ph | null | We discuss the theoretical possibility that the neutrino mass differences
have part of their origin in the quantum-decoherence-inducing medium of
space-time foam, which characterises some models of quantum gravity, in much
the same way as the celebrated MSW effect, responsible for the contribution to
mass differences when neutrinos pass through ordinary material media. We
briefly describe consequences of such decoherent media in inducing CPT
violation at a fundamental level, which would affect the neutrino oscillation
probability; we speculate on the connection of such phenomena with the role of
neutrinos for providing one possible source of a cosmological constant in the
Universe, of the phenomenologically right order of magnitude. Finally we
discuss possible experimental constraints on the amount of neutrino mass
differences induced by quantum gravity, which are based on fits of a simple
decoherence model with all the currently available neutrino data.
| [
{
"created": "Sun, 9 Apr 2006 12:32:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mavromatos",
"Nick E.",
"",
"King's Coll. London"
],
[
"Sarkar",
"Sarben",
"",
"king's\n Coll. London"
]
] | We discuss the theoretical possibility that the neutrino mass differences have part of their origin in the quantum-decoherence-inducing medium of space-time foam, which characterises some models of quantum gravity, in much the same way as the celebrated MSW effect, responsible for the contribution to mass differences when neutrinos pass through ordinary material media. We briefly describe consequences of such decoherent media in inducing CPT violation at a fundamental level, which would affect the neutrino oscillation probability; we speculate on the connection of such phenomena with the role of neutrinos for providing one possible source of a cosmological constant in the Universe, of the phenomenologically right order of magnitude. Finally we discuss possible experimental constraints on the amount of neutrino mass differences induced by quantum gravity, which are based on fits of a simple decoherence model with all the currently available neutrino data. |
hep-ph/9610496 | Bruce Ritzi | Bruce Ritzi, Graciela Gelmini | Strange Baryonic Matter from Chiral Effective Lagrangians | 25 pages, 3 eps figures, uses epsf style file, Latex, CHANGES: format
change and spelling | Nucl.Phys. B506 (1997) 348-370 | 10.1016/S0550-3213(97)00485-9 | UCLA/96/TEP/25 | hep-ph nucl-th | null | We investigate the existence of bound states of baryons in a kaon condensate
using chiral mean field theory.
The interactions are described by an effective SU(3)_L X SU(3)_R chiral
lagrangian where terms of higher order in density, baryon momentum, and kaon
mass are suppressed by powers of the symmetry breaking scale, Lambda. We take
up to next to leading order terms (n = 2,3,4). We search for infinite baryon
number solutions, namely ``strange baryonic matter'', using a Thomas-Fermi
approximation for a slowly varying condensate and a lowest order Hartree
approximation to describe the many body interactions. For simplicity we study a
pure K^0 condensate and only neutrons, the lightest baryons in that condensate.
We find solutions with neutron number densities, rho_n > 3.5 rho_0, where rho_0
is the infinite nuclear matter density. This is consistent with the estimate of
the onset of a K-condensate at rho_n = 2-4 rho_0. We show that the binding
energies, E_b, grow with rho_n and for rho_n < 7 rho_0 (at rho_n > 7 rho_0
perturbative expansion is lost) we find E_b < 150 MeV (E_b < 70 MeV for rho_n <
5 rho_0) even in the most favorable cases. These binding energies may be too
low for this type of matter to appear and persist in the early universe.
| [
{
"created": "Sat, 26 Oct 1996 02:12:05 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 1996 02:57:42 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Nov 1996 00:21:16 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Ritzi",
"Bruce",
""
],
[
"Gelmini",
"Graciela",
""
]
] | We investigate the existence of bound states of baryons in a kaon condensate using chiral mean field theory. The interactions are described by an effective SU(3)_L X SU(3)_R chiral lagrangian where terms of higher order in density, baryon momentum, and kaon mass are suppressed by powers of the symmetry breaking scale, Lambda. We take up to next to leading order terms (n = 2,3,4). We search for infinite baryon number solutions, namely ``strange baryonic matter'', using a Thomas-Fermi approximation for a slowly varying condensate and a lowest order Hartree approximation to describe the many body interactions. For simplicity we study a pure K^0 condensate and only neutrons, the lightest baryons in that condensate. We find solutions with neutron number densities, rho_n > 3.5 rho_0, where rho_0 is the infinite nuclear matter density. This is consistent with the estimate of the onset of a K-condensate at rho_n = 2-4 rho_0. We show that the binding energies, E_b, grow with rho_n and for rho_n < 7 rho_0 (at rho_n > 7 rho_0 perturbative expansion is lost) we find E_b < 150 MeV (E_b < 70 MeV for rho_n < 5 rho_0) even in the most favorable cases. These binding energies may be too low for this type of matter to appear and persist in the early universe. |
2311.13649 | Mohammadreza Zakeri | Susan Gardner and Mohammadreza Zakeri | Probing Dark Sectors with Neutron Stars | This article is an invited review for the "Neutron Lifetime" special
issue of the journal Universe. This is the published version; minor changes
were made and references added | Universe 2024, 10(2), 67 | 10.3390/universe10020067 | null | hep-ph astro-ph.HE nucl-th | http://creativecommons.org/licenses/by/4.0/ | Tensions in the measurements of neutron and kaon weak decays, such as of the
neutron lifetime, may speak to the existence of new particles and dynamics not
present in the Standard Model (SM). In scenarios with dark sectors, particles
that couple feebly to those of the SM appear. We offer a focused overview of
such possibilities and describe how the observations of neutron stars, which
probe either their structure or dynamics, limit them. In realizing these
constraints, we highlight how the assessment of particle processes within dense
baryonic matter impacts the emerging picture -- and we emphasize both the
flavor structure of the constraints and their broader connections to cogenesis
models of dark matter and baryogenesis.
| [
{
"created": "Wed, 22 Nov 2023 19:04:55 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2024 22:29:22 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Gardner",
"Susan",
""
],
[
"Zakeri",
"Mohammadreza",
""
]
] | Tensions in the measurements of neutron and kaon weak decays, such as of the neutron lifetime, may speak to the existence of new particles and dynamics not present in the Standard Model (SM). In scenarios with dark sectors, particles that couple feebly to those of the SM appear. We offer a focused overview of such possibilities and describe how the observations of neutron stars, which probe either their structure or dynamics, limit them. In realizing these constraints, we highlight how the assessment of particle processes within dense baryonic matter impacts the emerging picture -- and we emphasize both the flavor structure of the constraints and their broader connections to cogenesis models of dark matter and baryogenesis. |
1401.1298 | Zhi-Tian Zou | Zhi-Tian Zou and Cai-Dian Lu | The study of the nonleptonic two body B decays involving a light tensor
meson in final states | 19 pages, Invited review for Chinese Science Bulletin | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonleptonic two body $B_{u,d,s,c}$ decays involving a light tensor meson
in final states are studied in the perturbative QCD approach based on $k_T$
factorization. The decay modes with a tensor meson emitted, are prohibited in
naive factorization, since the emission diagram with a tensor meson produced
from vacuum is vanished. While contributions from the so-called hard scattering
emission diagrams and annihilation type diagrams are important and calculable
in the perturbative QCD approach.
The branching rations of most decays are in the range of $10^{-4}$ to
$10^{-8}$, which are bigger by 1 or 2 orders of magnitude than the predictions
given by naive factorization, but consistent with the predictions from QCD
factorization and the recent experimental measurements. We also give the
predictions for the direct $CP$ asymmetries, some of which are large enough for
the future experiments to measure. We also find that, even with a small mixing
angle, the mixing between $f_2$ and $f_2^{\prime}$ can bring remarkable changes
to both branching ratios and the direct $CP$ asymmetries for some decays
involving $f_2^{(\prime)}$ mesons.
For decays with a vector meson and a tensor meson in final states, we predict
a large percentage of transverse polarization contributions due to the
contributions of the orbital angular momentum of the tensor mesons.
| [
{
"created": "Tue, 7 Jan 2014 07:52:17 GMT",
"version": "v1"
}
] | 2014-01-08 | [
[
"Zou",
"Zhi-Tian",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | The nonleptonic two body $B_{u,d,s,c}$ decays involving a light tensor meson in final states are studied in the perturbative QCD approach based on $k_T$ factorization. The decay modes with a tensor meson emitted, are prohibited in naive factorization, since the emission diagram with a tensor meson produced from vacuum is vanished. While contributions from the so-called hard scattering emission diagrams and annihilation type diagrams are important and calculable in the perturbative QCD approach. The branching rations of most decays are in the range of $10^{-4}$ to $10^{-8}$, which are bigger by 1 or 2 orders of magnitude than the predictions given by naive factorization, but consistent with the predictions from QCD factorization and the recent experimental measurements. We also give the predictions for the direct $CP$ asymmetries, some of which are large enough for the future experiments to measure. We also find that, even with a small mixing angle, the mixing between $f_2$ and $f_2^{\prime}$ can bring remarkable changes to both branching ratios and the direct $CP$ asymmetries for some decays involving $f_2^{(\prime)}$ mesons. For decays with a vector meson and a tensor meson in final states, we predict a large percentage of transverse polarization contributions due to the contributions of the orbital angular momentum of the tensor mesons. |
2210.10844 | Sayak Chatterjee | S. Chatterjee, P. P. Bhaduri, S. Chattopadhyay | J/$\psi$ yields in low energy nuclear collisions at SPS and FAIR: A
baseline estimation | This version is accepted for publication in Nuclear Physics A | null | 10.1016/j.nuclphysa.2022.122554 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The yield of $J/\psi$ mesons, produced in proton-nucleus ($p+A$) and
nucleus-nucleus ($A+A$) collisions are estimated within a Glauber model ansatz
for the upcoming low energy heavy-ion collision experiments at SPS and FAIR. A
data driven parametrization is employed to incorporate the effects of Cold
Nuclear Matter (CNM) on the $J/\psi$ production cross-section.
| [
{
"created": "Wed, 19 Oct 2022 19:17:27 GMT",
"version": "v1"
}
] | 2022-10-21 | [
[
"Chatterjee",
"S.",
""
],
[
"Bhaduri",
"P. P.",
""
],
[
"Chattopadhyay",
"S.",
""
]
] | The yield of $J/\psi$ mesons, produced in proton-nucleus ($p+A$) and nucleus-nucleus ($A+A$) collisions are estimated within a Glauber model ansatz for the upcoming low energy heavy-ion collision experiments at SPS and FAIR. A data driven parametrization is employed to incorporate the effects of Cold Nuclear Matter (CNM) on the $J/\psi$ production cross-section. |
0902.2145 | Vyacheslav Rychkov | Riccardo Barbieri, Lawrence J. Hall, Vyacheslav S. Rychkov, Alessandro
Strumia | Multi-muon events at the Tevatron: a hidden sector from hadronic
collisions | 19 pp, v2: small changes, agrees with the published version | J.Phys.G36:115008,2009 | 10.1088/0954-3899/36/11/115008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Intrigued by some features of a small but significant fraction of the
multi-muon events recently published by the CDF collaboration, we show an
explicit attempt to describe them in terms of a light scalar singlet $\phi$
which communicates with the standard quarks either through a heavy scalar or a
heavy fermion exchange. As suggested in arXiv:0810.7530, the singlet $\phi$ has
a chain decay into a final state made of four $\tau\bar{\tau}$ pairs. We can
simulate most of the muon properties of the selected sample of events. Some of
these properties adhere rather well to the already published data; others
should allow a decisive test of the proposed interpretation. Assuming that the
test is positively passed, we show how the PAMELA excess can be fitted by the
annihilation of a TeV Dark Matter particle that communicates with the Standard
Model via the new light singlet(s).
| [
{
"created": "Thu, 12 Feb 2009 17:19:47 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Oct 2009 20:23:33 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Hall",
"Lawrence J.",
""
],
[
"Rychkov",
"Vyacheslav S.",
""
],
[
"Strumia",
"Alessandro",
""
]
] | Intrigued by some features of a small but significant fraction of the multi-muon events recently published by the CDF collaboration, we show an explicit attempt to describe them in terms of a light scalar singlet $\phi$ which communicates with the standard quarks either through a heavy scalar or a heavy fermion exchange. As suggested in arXiv:0810.7530, the singlet $\phi$ has a chain decay into a final state made of four $\tau\bar{\tau}$ pairs. We can simulate most of the muon properties of the selected sample of events. Some of these properties adhere rather well to the already published data; others should allow a decisive test of the proposed interpretation. Assuming that the test is positively passed, we show how the PAMELA excess can be fitted by the annihilation of a TeV Dark Matter particle that communicates with the Standard Model via the new light singlet(s). |
1608.00200 | Yoshiyuki Tatsuta | Yusuke Shimizu and Yoshiyuki Tatsuta | Edge of a cliff | 11 pages, 16 figures, final version | null | 10.1007/JHEP10(2016)040 | HUPD1606, WU-HEP-16-14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the neutrino flavor structures in the Occam's razor approach for
the Dirac neutrino mass matrices. We assume that the charged lepton mass matrix
takes a diagonal base, while the right-handed Majorana neutrino mass matrix is
also diagonal and we consider nine patterns of the four zero textures for the
Dirac neutrinos mass matrices. We numerically analyze the left-handed Majorana
neutrino mass matrices for nine patterns of the Dirac neutrino mass matrices
and we found two interesting patterns where both normal and inverted neutrino
mass hierarchies can be realized. We also found if the neutrino mass is normal
hierarchy, this scenario will be likely to be excluded by the measurements of
the Dirac CP violating phase in the T2K and NO$\nu $A neutrino experiments, for
instance. On the other hand, if the neutrino mass is inverted hierarchy, this
scenario will be also likely to be excluded by the measurements of neutrinoless
double beta decay experiments, e.g., KamLAND-Zen experiment.
| [
{
"created": "Sun, 31 Jul 2016 08:55:55 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2016 03:32:41 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Oct 2016 10:02:10 GMT",
"version": "v3"
}
] | 2016-11-03 | [
[
"Shimizu",
"Yusuke",
""
],
[
"Tatsuta",
"Yoshiyuki",
""
]
] | We discuss the neutrino flavor structures in the Occam's razor approach for the Dirac neutrino mass matrices. We assume that the charged lepton mass matrix takes a diagonal base, while the right-handed Majorana neutrino mass matrix is also diagonal and we consider nine patterns of the four zero textures for the Dirac neutrinos mass matrices. We numerically analyze the left-handed Majorana neutrino mass matrices for nine patterns of the Dirac neutrino mass matrices and we found two interesting patterns where both normal and inverted neutrino mass hierarchies can be realized. We also found if the neutrino mass is normal hierarchy, this scenario will be likely to be excluded by the measurements of the Dirac CP violating phase in the T2K and NO$\nu $A neutrino experiments, for instance. On the other hand, if the neutrino mass is inverted hierarchy, this scenario will be also likely to be excluded by the measurements of neutrinoless double beta decay experiments, e.g., KamLAND-Zen experiment. |
hep-ph/9602307 | J. W. F. Valle | H. Nunokawa, A. Rossi, V. B. Semikoz, and J. W. F. Valle | The effect of random matter density perturbations on the MSW solution to
the solar neutrino problem | latex file, 19 pages, plus 14 figures (uuencoded) | Nucl.Phys.B472:495-517,1996 | 10.1016/0550-3213(96)00236-2 | FTUV/95-47; IFIC/95-49 | hep-ph astro-ph | null | We consider the implications of solar matter density random noise upon
resonant neutrino conversion. The evolution equation describing MSW-like
conversion is derived in the framework of the Schr\"odinger approach. We study
quantitatively their effect upon both large and small mixing angle MSW
solutions to the solar neutrino problem. This is carried out both for the
active-active $\nu_e \ra \nu_{\mu,\tau}$ as well as active-sterile $\nu_e \ra
\nu_s$ conversion channels. We find that the small mixing MSW solution is much
more stable (especially in $\Delta m^2$) than the large mixing solution. The
possible existence of solar matter density noise at the few percent level could
be tested at future solar neutrino experiments, especially Borexino.
| [
{
"created": "Wed, 14 Feb 1996 12:15:11 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Nunokawa",
"H.",
""
],
[
"Rossi",
"A.",
""
],
[
"Semikoz",
"V. B.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We consider the implications of solar matter density random noise upon resonant neutrino conversion. The evolution equation describing MSW-like conversion is derived in the framework of the Schr\"odinger approach. We study quantitatively their effect upon both large and small mixing angle MSW solutions to the solar neutrino problem. This is carried out both for the active-active $\nu_e \ra \nu_{\mu,\tau}$ as well as active-sterile $\nu_e \ra \nu_s$ conversion channels. We find that the small mixing MSW solution is much more stable (especially in $\Delta m^2$) than the large mixing solution. The possible existence of solar matter density noise at the few percent level could be tested at future solar neutrino experiments, especially Borexino. |
hep-ph/0604188 | Markus Ahlers | Markus Ahlers, Joern Kersten, Andreas Ringwald | Long-Lived Staus at Neutrino Telescopes | 12 pages, 6 figures, uses iopart.cls; v2: minor clarifications and
references added | JCAP 0607 (2006) 005 | 10.1088/1475-7516/2006/07/005 | DESY 06-046 | hep-ph astro-ph | null | We perform an exhaustive study of the role neutrino telescopes could play in
the discovery and exploration of supersymmetric extensions of the Standard
Model with a long-lived stau next-to-lightest superparticle. These staus are
produced in pairs by cosmic neutrino interactions in the Earth matter. We show
that the background of stau events to the standard muon signal is negligible
and plays no role in the determination of the cosmic neutrino flux. On the
other hand, one can expect up to 50 pair events per year in a cubic kilometer
detector such as IceCube, if the superpartner mass spectrum and the high-energy
cosmic neutrino flux are close to experimental bounds.
| [
{
"created": "Fri, 21 Apr 2006 15:32:03 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2006 14:10:23 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Ahlers",
"Markus",
""
],
[
"Kersten",
"Joern",
""
],
[
"Ringwald",
"Andreas",
""
]
] | We perform an exhaustive study of the role neutrino telescopes could play in the discovery and exploration of supersymmetric extensions of the Standard Model with a long-lived stau next-to-lightest superparticle. These staus are produced in pairs by cosmic neutrino interactions in the Earth matter. We show that the background of stau events to the standard muon signal is negligible and plays no role in the determination of the cosmic neutrino flux. On the other hand, one can expect up to 50 pair events per year in a cubic kilometer detector such as IceCube, if the superpartner mass spectrum and the high-energy cosmic neutrino flux are close to experimental bounds. |
2405.02400 | Peter Denton | Peter B. Denton and Stephen J. Parke | Fast and Accurate Algorithm for Calculating Long-Baseline Neutrino
Oscillation Probabilities with Matter Effects: NuFast | 10 pages, 3 figures, code available
https://github.com/PeterDenton/NuFast | null | null | Fermilab-Pub-24-0207-T | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Neutrino oscillation experiments will be entering the precision era in the
next decade with the advent of high statistics experiments like DUNE, HK, and
JUNO. Correctly estimating the confidence intervals from data for the
oscillation parameters requires very large Monte Carlo data sets involving
calculating the oscillation probabilities in matter many, many times. In this
paper, we leverage past work to present a new, fast, precise technique for
calculating neutrino oscillation probabilities in matter optimized for
long-baseline neutrino oscillations in the Earth's crust including both
accelerator and reactor experiments. For ease of use by theorists and
experimentalists, we provide fast c++ and fortran codes.
| [
{
"created": "Fri, 3 May 2024 18:00:02 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Denton",
"Peter B.",
""
],
[
"Parke",
"Stephen J.",
""
]
] | Neutrino oscillation experiments will be entering the precision era in the next decade with the advent of high statistics experiments like DUNE, HK, and JUNO. Correctly estimating the confidence intervals from data for the oscillation parameters requires very large Monte Carlo data sets involving calculating the oscillation probabilities in matter many, many times. In this paper, we leverage past work to present a new, fast, precise technique for calculating neutrino oscillation probabilities in matter optimized for long-baseline neutrino oscillations in the Earth's crust including both accelerator and reactor experiments. For ease of use by theorists and experimentalists, we provide fast c++ and fortran codes. |
1806.10102 | Stefan Prestel | Joshua Isaacson and Stefan Prestel | On stochastically sampling color configurations | 13 pages, 7 color figures, updated to version submitted to journal,
disentangled some otherwise confusing referencing | Phys. Rev. D 99, 014021 (2019) | 10.1103/PhysRevD.99.014021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Parton shower algorithms are key components of theoretical predictions for
high-energy collider physics. Work towards more accurate parton shower
algorithms is thus pursued along many different avenues. The systematic
treatment of subleading color corrections in parton shower algorithms is
however technically challenging and remains elusive. In this article, we
present an efficient and numerically stable algorithm to sample color
configurations at fixed $N_C=3$, using the correct color factor including
subleading corrections with a parton shower. The algorithm is implemented as
stand-alone program that can be interfaced to the PYTHIA event generator.
Preliminary comparisons to to LEP data are presented.
| [
{
"created": "Tue, 26 Jun 2018 16:42:29 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2018 17:05:23 GMT",
"version": "v2"
}
] | 2019-01-23 | [
[
"Isaacson",
"Joshua",
""
],
[
"Prestel",
"Stefan",
""
]
] | Parton shower algorithms are key components of theoretical predictions for high-energy collider physics. Work towards more accurate parton shower algorithms is thus pursued along many different avenues. The systematic treatment of subleading color corrections in parton shower algorithms is however technically challenging and remains elusive. In this article, we present an efficient and numerically stable algorithm to sample color configurations at fixed $N_C=3$, using the correct color factor including subleading corrections with a parton shower. The algorithm is implemented as stand-alone program that can be interfaced to the PYTHIA event generator. Preliminary comparisons to to LEP data are presented. |
2310.06901 | Jun'ya Kume | Ryusuke Jinno, Jun'ya Kume and Masaki Yamada | Super-slow phase transition catalyzed by BHs and the birth of baby BHs | 10 pages, 3 figures; v2: version published in PLB | Phys.Lett.B 849 (2024) 138465 | 10.1016/j.physletb.2024.138465 | TU-1209, RESCEU-18/23 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the unique phenomenology of first-order phase transitions
catalyzed by primordial black holes (BHs). If the number of BHs within one
Hubble volume is smaller than unity at the time of bubble nucleation, each
bubble catalyzed around them can expand to the Hubble size, and the universe is
eventually filled with true vacuum much after nucleation. This super-slow
transition predicts enhanced gravitational wave signals from bubble collisions
and can be tested in future observations. Moreover, the remaining rare false
vacuum patches give birth to baby BHs, which can account for the abundance of
dark matter in our universe.
| [
{
"created": "Tue, 10 Oct 2023 18:00:50 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2024 13:38:30 GMT",
"version": "v2"
}
] | 2024-02-26 | [
[
"Jinno",
"Ryusuke",
""
],
[
"Kume",
"Jun'ya",
""
],
[
"Yamada",
"Masaki",
""
]
] | We discuss the unique phenomenology of first-order phase transitions catalyzed by primordial black holes (BHs). If the number of BHs within one Hubble volume is smaller than unity at the time of bubble nucleation, each bubble catalyzed around them can expand to the Hubble size, and the universe is eventually filled with true vacuum much after nucleation. This super-slow transition predicts enhanced gravitational wave signals from bubble collisions and can be tested in future observations. Moreover, the remaining rare false vacuum patches give birth to baby BHs, which can account for the abundance of dark matter in our universe. |
1101.1324 | Wojciech Krolikowski | Wojciech Krolikowski | Hidden-sector correction to Coulomb potential through the photonic
portal | 7 pages | Acta Phys.Polon.B42:1261-1266,2011 | 10.5506/APhysPolB.42.1261 | IFT-11/1 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in the model of hidden sector of the Universe, interacting with
the Standard-Model sector through the photonic portal, the Standard-Model
Coulomb potential gets a tiny hidden-sector additive correction that might turn
out to be either exciting or fatal for the verification of this model.
| [
{
"created": "Mon, 3 Jan 2011 10:35:48 GMT",
"version": "v1"
}
] | 2011-06-30 | [
[
"Krolikowski",
"Wojciech",
""
]
] | We show that in the model of hidden sector of the Universe, interacting with the Standard-Model sector through the photonic portal, the Standard-Model Coulomb potential gets a tiny hidden-sector additive correction that might turn out to be either exciting or fatal for the verification of this model. |
hep-ph/9508224 | null | A. Edin, G. Ingelman, J. Rathsman | Rapidity Gaps in DIS through Soft Colour Interactions | 4 pages Latex, 4 encapsulated Postscript figures, uses qcdparis.sty,
tar-compressed and uuencoded with uufiles, Presented by GI at workshop `DIS
and QCD', Paris, April 1995, minor Postscript problem fixed | null | null | DESY 95-145 | hep-ph | null | We present a new mechanism for the creation of large rapidity gaps in DIS
events at HERA. Soft colour interactions between perturbatively produced
partons and colour-charges in the proton remnant, modifies the colour structure
for hadronization giving colour singlet systems that are well separated in
rapidity. An explicit model is presented that, although the detailed results
depend on the initial state parton emission, can describe both the observed
rapidity gaps and, in addition, the forward energy flow in an inclusive event
sample.
| [
{
"created": "Thu, 3 Aug 1995 11:40:00 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 1995 12:57:00 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Edin",
"A.",
""
],
[
"Ingelman",
"G.",
""
],
[
"Rathsman",
"J.",
""
]
] | We present a new mechanism for the creation of large rapidity gaps in DIS events at HERA. Soft colour interactions between perturbatively produced partons and colour-charges in the proton remnant, modifies the colour structure for hadronization giving colour singlet systems that are well separated in rapidity. An explicit model is presented that, although the detailed results depend on the initial state parton emission, can describe both the observed rapidity gaps and, in addition, the forward energy flow in an inclusive event sample. |
1801.09405 | Hyun-Chul Kim | June-Young Kim, Hyun-Chul Kim, Ghil-Seok Yang | Mass spectra of singly heavy baryons in a self-consistent chiral
quark-soliton model | 15 pages. 1 figure | Phys. Rev. D 98, 054004 (2018) | 10.1103/PhysRevD.98.054004 | INHA-NTG-01/2018 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the mass spectra of the lowest-lying singly heavy baryons,
based on the self-consistent chiral quark-soliton model. We take into account
the rotational $1/N_c$ and strange current quark mass ($m_{\mathrm{s}}$)
corrections. Regarding $m_{\mathrm{s}}$ as a small perturbation, we expand the
effective chiral action to the second order with respect to $m_{s}$. The mass
spectra of heavy baryons are computed and compared with the experimental data.
Fitting the classical masses of the heavy baryon to the center mass of each
representation, we determine the masses of all the lowest-lying singly heavy
baryons. We predict the mass of the $\Omega_b^*$ baryon to be 6081.9 MeV, when
the second-order $m_{\mathrm{s}}$ corrections are included.
| [
{
"created": "Mon, 29 Jan 2018 09:07:31 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2018 14:45:42 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Jul 2018 14:28:19 GMT",
"version": "v3"
}
] | 2018-09-12 | [
[
"Kim",
"June-Young",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Yang",
"Ghil-Seok",
""
]
] | We investigate the mass spectra of the lowest-lying singly heavy baryons, based on the self-consistent chiral quark-soliton model. We take into account the rotational $1/N_c$ and strange current quark mass ($m_{\mathrm{s}}$) corrections. Regarding $m_{\mathrm{s}}$ as a small perturbation, we expand the effective chiral action to the second order with respect to $m_{s}$. The mass spectra of heavy baryons are computed and compared with the experimental data. Fitting the classical masses of the heavy baryon to the center mass of each representation, we determine the masses of all the lowest-lying singly heavy baryons. We predict the mass of the $\Omega_b^*$ baryon to be 6081.9 MeV, when the second-order $m_{\mathrm{s}}$ corrections are included. |
0811.3631 | Christian Weiss | M. Strikman, C. Weiss | Pion cloud and sea quark flavor asymmetry in the impact parameter
representation | 7 pages, 3 figures. To appear in proceedings of LIGHT CONE 2008
Relativistic Nuclear and Particle Physics, Mulhouse, France, July 7-11, 2008 | PoS LC2008:043,2008 | null | JLAB-THY-08-915 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study large-distance contributions to the nucleon parton densities in the
transverse coordinate (impact parameter) representation based on generalized
parton distributions (GPDs). Chiral dynamics generates a distinct component of
the partonic structure, located at momentum fractions x ~< M_pi/M_N and
transverse distances b ~ 1/M_pi. We analyze the phenomenological "pion cloud"
model of the flavor asymmetry dbar(x) - ubar(x) and quantify what fraction of
the calculated asymmetry results from the universal large-distance region. Our
findings indicate that a two-component picture of the nucleon's partonic
structure, with a "core" antiquark distribution at b < b_core ~= 0.55 fm which
vanishes at x -> 0 and the universal large-distance pion cloud, could naturally
account for the x-dependence of the measured asymmetry.
| [
{
"created": "Fri, 21 Nov 2008 20:44:14 GMT",
"version": "v1"
}
] | 2009-04-14 | [
[
"Strikman",
"M.",
""
],
[
"Weiss",
"C.",
""
]
] | We study large-distance contributions to the nucleon parton densities in the transverse coordinate (impact parameter) representation based on generalized parton distributions (GPDs). Chiral dynamics generates a distinct component of the partonic structure, located at momentum fractions x ~< M_pi/M_N and transverse distances b ~ 1/M_pi. We analyze the phenomenological "pion cloud" model of the flavor asymmetry dbar(x) - ubar(x) and quantify what fraction of the calculated asymmetry results from the universal large-distance region. Our findings indicate that a two-component picture of the nucleon's partonic structure, with a "core" antiquark distribution at b < b_core ~= 0.55 fm which vanishes at x -> 0 and the universal large-distance pion cloud, could naturally account for the x-dependence of the measured asymmetry. |
1411.3680 | Leonard S. Kisslinger | Leonard S. Kisslinger, Debasish Das | Review of QCD, Quark-Gluon Plasma, Heavy Quark Hybrids, and Heavy Quark
State production in p-p and A-A collisions | 53 pages, 46 figures | Int.J.Mod.Phys.A Vol31(2016) 1630010 | 10.1142/S0217751X16300106 | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a review of the Quantum Chromodynamics Cosmological Phase
Transitions, the Quark-Gluon Plasma, the production of heavy quark states via
p-p collisions and RHIC (Relativistic Heavy Ion Collisions) using the mixed
hybrid theory for the $\Psi(2S)$ and $\Upsilon(3S)$ states; and the possible
detection of the Quark-Gluon Plasma via heavy quark production using RHIC.
Recent research on fragmentation for the production of D mesons is reviewed, as
is future theoretical and experimental research on the Collins and Sivers
fragmentation functions for pions produced in polarized p-p collisions.
| [
{
"created": "Tue, 28 Oct 2014 18:04:36 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2014 20:07:41 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Apr 2015 19:14:23 GMT",
"version": "v3"
},
{
"created": "Tue, 12 May 2015 18:56:37 GMT",
"version": "v4"
},
{
"c... | 2016-02-09 | [
[
"Kisslinger",
"Leonard S.",
""
],
[
"Das",
"Debasish",
""
]
] | This is a review of the Quantum Chromodynamics Cosmological Phase Transitions, the Quark-Gluon Plasma, the production of heavy quark states via p-p collisions and RHIC (Relativistic Heavy Ion Collisions) using the mixed hybrid theory for the $\Psi(2S)$ and $\Upsilon(3S)$ states; and the possible detection of the Quark-Gluon Plasma via heavy quark production using RHIC. Recent research on fragmentation for the production of D mesons is reviewed, as is future theoretical and experimental research on the Collins and Sivers fragmentation functions for pions produced in polarized p-p collisions. |
1710.02507 | Frans Klinkhamer | F.R. Klinkhamer, M. Niechciol, M. Risse | Improved bound on isotropic Lorentz violation in the photon sector from
extensive air showers | 18 pages, v4: published version, with a typo corrected in the
sentence below Eq. (15) | Phys. Rev. D 96, 116011 (2017) | 10.1103/PhysRevD.96.116011 | KA-TP-31-2017 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic rays have extremely high particle energies (up to $10^{20} \;
\text{eV}$) and can be used to search for violations of Lorentz invariance. We
consider isotropic nonbirefringent Lorentz violation in the photon sector for
the case of a photon velocity larger than the maximum attainable velocity of
the standard fermions. Up to now, Earth-based bounds on this type of Lorentz
violation have been determined from observations of TeV gamma rays. Here, we
elaborate on a novel approach to test Lorentz invariance with greatly improved
sensitivity. This approach is based on investigating extensive air showers
which are induced by cosmic-ray particles in the Earth's atmosphere. We study
the impact of two Lorentz-violating decay processes on the longitudinal
development of air showers, notably the atmospheric depth of the shower maximum
$X_\text{max}$. Specifically, the two Lorentz-violating decay processes
considered are photon decay into an electron-positron pair and modified
neutral-pion decay into two photons. We use Monte Carlo simulations performed
with the CONEX code which was extended to include these two Lorentz-violating
decay processes at a magnitude allowed by the best previous Earth-based bound.
Compared to standard physics, these Lorentz-violating decay processes reduce
the average $X_\text{max}$ for showers with primary energies above
$10^{18}\;\text{eV}$ by an amount that is significantly larger than the average
resolution of current air shower experiments. Comparing the simulations of the
average $X_\text{max}$ to observations, new Earth-based bounds on this type of
Lorentz violation are obtained, which are better than the previous bounds by
more than three orders of magnitude. Prospects of further studies are also
discussed.
| [
{
"created": "Fri, 6 Oct 2017 17:26:24 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2017 17:27:32 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Nov 2017 18:23:58 GMT",
"version": "v3"
},
{
"created": "Thu, 14 Dec 2017 12:59:32 GMT",
"version": "v4"
}
] | 2017-12-20 | [
[
"Klinkhamer",
"F. R.",
""
],
[
"Niechciol",
"M.",
""
],
[
"Risse",
"M.",
""
]
] | Cosmic rays have extremely high particle energies (up to $10^{20} \; \text{eV}$) and can be used to search for violations of Lorentz invariance. We consider isotropic nonbirefringent Lorentz violation in the photon sector for the case of a photon velocity larger than the maximum attainable velocity of the standard fermions. Up to now, Earth-based bounds on this type of Lorentz violation have been determined from observations of TeV gamma rays. Here, we elaborate on a novel approach to test Lorentz invariance with greatly improved sensitivity. This approach is based on investigating extensive air showers which are induced by cosmic-ray particles in the Earth's atmosphere. We study the impact of two Lorentz-violating decay processes on the longitudinal development of air showers, notably the atmospheric depth of the shower maximum $X_\text{max}$. Specifically, the two Lorentz-violating decay processes considered are photon decay into an electron-positron pair and modified neutral-pion decay into two photons. We use Monte Carlo simulations performed with the CONEX code which was extended to include these two Lorentz-violating decay processes at a magnitude allowed by the best previous Earth-based bound. Compared to standard physics, these Lorentz-violating decay processes reduce the average $X_\text{max}$ for showers with primary energies above $10^{18}\;\text{eV}$ by an amount that is significantly larger than the average resolution of current air shower experiments. Comparing the simulations of the average $X_\text{max}$ to observations, new Earth-based bounds on this type of Lorentz violation are obtained, which are better than the previous bounds by more than three orders of magnitude. Prospects of further studies are also discussed. |
hep-ph/9602217 | Nathan Francis Lepora | Nathan F. Lepora and Adrian Martin | Topological Inflation, without the Topology | 42 pages. LaTeX. 3 figures included. Minor changes to introduction | null | null | DAMTP-95-48 | hep-ph | null | We extend the `topological inflation' of Linde and Vilenkin to {\em unstable}
monopoles. This allows the monopole to decay; not inflating eternally, as
topological inflation demands. Such a situation happens naturally in some Grand
Unified Theories --- such as supersymmetric flipped-$SU(5)$. We analyse
analytically the dynamics of inflating monopoles to determine the equations
governing the expansion, additionally recovering the bound on the scale of
symmetry breaking found numerically by Sakai {\em et. al.} The latter half of
this paper is devoted to the Cosmology of inflating unstable monopoles ---
which is an example of an inhomogeneous cosmology. We describe how such a
monopole may be formed and how long it inflates for --- finding it to be a
random process. We then derive how cosmological parameters, such as density and
temperature, are distributed at the end of inflation, and how the Universe
reheats as the monopole decays. The general conclusion of this work is that
such inflation creates a local region of relatively flat, homogenous and
isotropic Universe surrounded by pre-GUT matter.
| [
{
"created": "Fri, 2 Feb 1996 18:36:20 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 1996 17:45:42 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Lepora",
"Nathan F.",
""
],
[
"Martin",
"Adrian",
""
]
] | We extend the `topological inflation' of Linde and Vilenkin to {\em unstable} monopoles. This allows the monopole to decay; not inflating eternally, as topological inflation demands. Such a situation happens naturally in some Grand Unified Theories --- such as supersymmetric flipped-$SU(5)$. We analyse analytically the dynamics of inflating monopoles to determine the equations governing the expansion, additionally recovering the bound on the scale of symmetry breaking found numerically by Sakai {\em et. al.} The latter half of this paper is devoted to the Cosmology of inflating unstable monopoles --- which is an example of an inhomogeneous cosmology. We describe how such a monopole may be formed and how long it inflates for --- finding it to be a random process. We then derive how cosmological parameters, such as density and temperature, are distributed at the end of inflation, and how the Universe reheats as the monopole decays. The general conclusion of this work is that such inflation creates a local region of relatively flat, homogenous and isotropic Universe surrounded by pre-GUT matter. |
hep-ph/0610046 | Miguel Sanchis | Miguel-Angel Sanchis-Lozano | Proposal for testing lepton universality in Upsilon decays at a
B-factory running at $\Upsilon(3S)$ | 10 pages, 2 figures, Contributed paper to BNM2006 Workshop, September
13-14, 2006, KEK | J.Phys.Soc.Jap.76:044101-044200,2007 | 10.1143/JPSJ.76.044101 | IFIC/06-30, FTUV-06-1004 | hep-ph | null | We present a proposal for detecting new physics at a B-factory running at the
$\Upsilon(3S)$ resonance by testing lepton universality to the few percent
level in the leptonic decays of the $\Upsilon(1S)$ and $\Upsilon(2S)$
resonances tagged by the dipion in the chain decay: $\Upsilon(3S) \to
pi^+\pi^-\Upsilon(1S,2S)$; $\Upsilon(1S,2S) \to \ell^+\ell^-$,
$\ell=e,\mu,\tau$.
| [
{
"created": "Wed, 4 Oct 2006 15:40:44 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Feb 2007 15:29:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sanchis-Lozano",
"Miguel-Angel",
""
]
] | We present a proposal for detecting new physics at a B-factory running at the $\Upsilon(3S)$ resonance by testing lepton universality to the few percent level in the leptonic decays of the $\Upsilon(1S)$ and $\Upsilon(2S)$ resonances tagged by the dipion in the chain decay: $\Upsilon(3S) \to pi^+\pi^-\Upsilon(1S,2S)$; $\Upsilon(1S,2S) \to \ell^+\ell^-$, $\ell=e,\mu,\tau$. |
hep-ph/0302030 | Marco Peloso | Csaba Csaki, Nemanja Kaloper, Marco Peloso and John Terning | Super-GZK Photons from Photon-Axion Mixing | 17 pages, 5 figures. Published version | JCAP 0305:005,2003 | 10.1088/1475-7516/2003/05/005 | null | hep-ph astro-ph gr-qc hep-th | null | We show that photons with energies above the GZK cutoff can reach us from
very distant sources if they mix with light axions in extragalactic magnetic
fields. The effect which enables this is the conversion of photons into axions,
which are sufficiently weakly coupled to travel large distances unimpeded.
These axions then convert back into high energy photons close to the Earth. We
show that photon-axion mixing facilitates the survival of super-GZK photons
most efficiently with a photon-axion coupling scale of order 10^11 GeV, which
is in the same range as the scale for the photon-axion mixing explanation for
the dimming of supernovae without cosmic acceleration. We discuss possible
observational consequences of this effect.
| [
{
"created": "Wed, 5 Feb 2003 20:49:52 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2003 18:09:49 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Csaki",
"Csaba",
""
],
[
"Kaloper",
"Nemanja",
""
],
[
"Peloso",
"Marco",
""
],
[
"Terning",
"John",
""
]
] | We show that photons with energies above the GZK cutoff can reach us from very distant sources if they mix with light axions in extragalactic magnetic fields. The effect which enables this is the conversion of photons into axions, which are sufficiently weakly coupled to travel large distances unimpeded. These axions then convert back into high energy photons close to the Earth. We show that photon-axion mixing facilitates the survival of super-GZK photons most efficiently with a photon-axion coupling scale of order 10^11 GeV, which is in the same range as the scale for the photon-axion mixing explanation for the dimming of supernovae without cosmic acceleration. We discuss possible observational consequences of this effect. |
hep-ph/0510081 | Jing Shu | Sean M. Carroll, Jing Shu | Models of Baryogenesis via Spontaneous Lorentz Violation | 26 pages, 1 figure. references added. submited to PRD | Phys.Rev.D73:103515,2006 | 10.1103/PhysRevD.73.103515 | EFI-2005-17 | hep-ph astro-ph | null | In the presence of background fields that spontaneously violate Lorentz
invariance, a matter-antimatter asymmetry can be generated even in thermal
equilibrium. In this paper we systematically investigate models of this type,
showing that either high-energy or electroweak versions of baryogenesis are
possible, depending on the dynamics of the Lorentz-violating fields. In
addition to the previously-studied models of spontaneous baryogenesis and
quintessential baryogenesis, we identify two scenarios of interest:
baryogenesis from a pseudo-Nambu-Goldstone boson with weak-scale mass and
intermediate-scale baryon-number violation, and sphaleron-induced baryogenesis
driven by a constant-magnitude vector with a late-time phase transition.
| [
{
"created": "Fri, 7 Oct 2005 18:51:14 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Nov 2005 20:39:56 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Nov 2005 01:37:35 GMT",
"version": "v3"
}
] | 2011-05-12 | [
[
"Carroll",
"Sean M.",
""
],
[
"Shu",
"Jing",
""
]
] | In the presence of background fields that spontaneously violate Lorentz invariance, a matter-antimatter asymmetry can be generated even in thermal equilibrium. In this paper we systematically investigate models of this type, showing that either high-energy or electroweak versions of baryogenesis are possible, depending on the dynamics of the Lorentz-violating fields. In addition to the previously-studied models of spontaneous baryogenesis and quintessential baryogenesis, we identify two scenarios of interest: baryogenesis from a pseudo-Nambu-Goldstone boson with weak-scale mass and intermediate-scale baryon-number violation, and sphaleron-induced baryogenesis driven by a constant-magnitude vector with a late-time phase transition. |
hep-ph/9805348 | null | A .N. Ivanov, M. Nagy and N. I. Troitskaya (Vienna Techn.Univ.) | Effective quark model with chiral U(3)XU(3) symmetry for baryon octet
and decuplet | 16 pages, Latex, no figures | Phys.Rev.C59:451-459,1999 | 10.1103/PhysRevC.59.451 | null | hep-ph | null | We suggest an effective quark model for low-lying baryon octet and decuplet
motivated by QCD with a linearly rising confinement potential incorporating the
extended Nambu-Jona-Lasinio (ENJL) model with linear realization of chiral
U(3)XU(3) symmetry. Baryons are considered as external heavy states coupled to
local three-quark currents with fixed spinorial structure and to low-lying
mesons through quark-meson interactions defined in the ENJL--model. In the
constituent quark loop representation we have calculated the coupling constants
of the (pi NN), (pi N Delta) and (gamma N Delta) interactions and the
(sigma_{\pi N})-term. The obtained results are in reasonable agreement with
experimental data and other effective field theory approaches.
| [
{
"created": "Sun, 17 May 1998 13:25:04 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 1998 21:17:20 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Aug 1998 16:34:28 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Ivanov",
"A . N.",
"",
"Vienna Techn.Univ."
],
[
"Nagy",
"M.",
"",
"Vienna Techn.Univ."
],
[
"Troitskaya",
"N. I.",
"",
"Vienna Techn.Univ."
]
] | We suggest an effective quark model for low-lying baryon octet and decuplet motivated by QCD with a linearly rising confinement potential incorporating the extended Nambu-Jona-Lasinio (ENJL) model with linear realization of chiral U(3)XU(3) symmetry. Baryons are considered as external heavy states coupled to local three-quark currents with fixed spinorial structure and to low-lying mesons through quark-meson interactions defined in the ENJL--model. In the constituent quark loop representation we have calculated the coupling constants of the (pi NN), (pi N Delta) and (gamma N Delta) interactions and the (sigma_{\pi N})-term. The obtained results are in reasonable agreement with experimental data and other effective field theory approaches. |
1507.06676 | R. Sekhar Chivukula | R. Sekhar Chivukula, Pawin Ittisamai, Kirtimaan Mohan, and Elizabeth
H. Simmons | The Color Discriminant Variable and Scalar Diquarks at the LHC | 22 pages, 11 pdf figures. One reference added, one updated. arXiv
admin note: text overlap with arXiv:1406.2003 | Phys. Rev. D 92, 075020 (2015) | 10.1103/PhysRevD.92.075020 | MSUHEP-150723 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC is actively searching for narrow dijet resonances corresponding to
physics beyond the Standard Model. Among the many resonances that have been
postulated (e.g., colored vectors, scalars, and fermions) one that would have a
particularly large production rate at the LHC would be a scalar diquark
produced in the s-channel via fusion of two valence quarks. In previous work,
we introduced a color discriminant variable that distinguishes among various
dijet resonances, drawing on measurements of the dijet resonance mass, total
decay width and production cross-section. Here, we show that this
model-independent method applies well to color-triplet and color-sextet scalar
diquarks, distinguishing them clearly from other candidate resonances. We also
introduce a more transparent theoretical formulation of the color discriminant
variable that highlights its relationship to the branching ratios of the
resonance into incoming and outgoing partons and to the properties of those
partons. While the original description of the color discriminant variable
remains convenient for phenomenological use upon discovery of a new resonance,
the new formulation makes it easier to predict the value of the variable for a
given class of resonance.
| [
{
"created": "Thu, 23 Jul 2015 20:40:35 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Aug 2015 15:57:52 GMT",
"version": "v2"
}
] | 2015-10-21 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Ittisamai",
"Pawin",
""
],
[
"Mohan",
"Kirtimaan",
""
],
[
"Simmons",
"Elizabeth H.",
""
]
] | The LHC is actively searching for narrow dijet resonances corresponding to physics beyond the Standard Model. Among the many resonances that have been postulated (e.g., colored vectors, scalars, and fermions) one that would have a particularly large production rate at the LHC would be a scalar diquark produced in the s-channel via fusion of two valence quarks. In previous work, we introduced a color discriminant variable that distinguishes among various dijet resonances, drawing on measurements of the dijet resonance mass, total decay width and production cross-section. Here, we show that this model-independent method applies well to color-triplet and color-sextet scalar diquarks, distinguishing them clearly from other candidate resonances. We also introduce a more transparent theoretical formulation of the color discriminant variable that highlights its relationship to the branching ratios of the resonance into incoming and outgoing partons and to the properties of those partons. While the original description of the color discriminant variable remains convenient for phenomenological use upon discovery of a new resonance, the new formulation makes it easier to predict the value of the variable for a given class of resonance. |
1311.4413 | Chitta Ranjan Das | C.D. Froggatt, C.R. Das, L.V. Laperashvili, H.B. Nielsen and A.
Tureanu | Gravi-Weak Unification and Multiple Point Principle | 55 pages, 2 figures, International Conference of RAS, Protvino,
Russian Federation, November 5-8, 2013 | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a model unifying gravity with weak $SU(2)$ gauge and "Higgs"
scalar fields. We assume the existence of a visible and an invisible (hidden)
sector of the Universe. We used the extension of Plebanski's 4-dimensional
gravitational theory, in which the fundamental fields are two-forms containing
tetrads, spin connections and additional auxiliary fields. Considering a
$Spin(4,4)$ invariant extended Plebanski action, we recover the actions in both
(visible and invisible) sectors of the Universe. After symmetry breaking of the
graviweak (GW) unification, its physical constants (Newton's constants,
cosmological constants, YM-couplings, etc.), are determined by a parameter
$g_{uni}$ of the GW unification. It is discussed that if this "Higgs" field
coming in the GW unification could be the Higgs of the Standard Model, then the
idea that its vacuum value could be, according to the Multiple Point Principle,
a second minimum of the Higgs field effective potential, turns out not to be
viable. Then other scalar "Higgs" field, giving the inflation and axion fields,
has a Planck scale expectation value, and could have a better chance of being
the scalar field unified with gravity.
| [
{
"created": "Mon, 18 Nov 2013 14:53:05 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 2013 11:28:24 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Dec 2013 09:47:56 GMT",
"version": "v3"
}
] | 2013-12-24 | [
[
"Froggatt",
"C. D.",
""
],
[
"Das",
"C. R.",
""
],
[
"Laperashvili",
"L. V.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Tureanu",
"A.",
""
]
] | We construct a model unifying gravity with weak $SU(2)$ gauge and "Higgs" scalar fields. We assume the existence of a visible and an invisible (hidden) sector of the Universe. We used the extension of Plebanski's 4-dimensional gravitational theory, in which the fundamental fields are two-forms containing tetrads, spin connections and additional auxiliary fields. Considering a $Spin(4,4)$ invariant extended Plebanski action, we recover the actions in both (visible and invisible) sectors of the Universe. After symmetry breaking of the graviweak (GW) unification, its physical constants (Newton's constants, cosmological constants, YM-couplings, etc.), are determined by a parameter $g_{uni}$ of the GW unification. It is discussed that if this "Higgs" field coming in the GW unification could be the Higgs of the Standard Model, then the idea that its vacuum value could be, according to the Multiple Point Principle, a second minimum of the Higgs field effective potential, turns out not to be viable. Then other scalar "Higgs" field, giving the inflation and axion fields, has a Planck scale expectation value, and could have a better chance of being the scalar field unified with gravity. |
hep-ph/0607253 | Gui-Jun Ding ding | Gui-Jun Ding, Mu-Lin Yan | X(1576) as Diquark-Antidiquark Bound State | 15 pages, 1 figure | Phys.Lett.B643:33-40,2006 | 10.1016/j.physletb.2006.10.022 | USTC-ICTS-06-06 | hep-ph | null | We propose that the broad $1^{--}$ resonance structure recently discovered by
BES in $J/\psi\to K^{+}K^{-}\pi^{0}$ is the P-wave excitation of a
diquark-antidiquark bound state. This interpretation implies that there exists
a negative parity, vector nonet. A rough estimate of the mass spectrum of the
nonet is presented, and the prediction for the mass of X(1576) is consistent
with the experimental data. The OZI allowed strong decays are studied, it can
decay into two pseudoscalars or one pseudoscalar plus one vector meson. A
crucial prediction is that X(1576) should dominantly decay into $K^{+}K^{-}$,
$K_{L}K_{S}$, $\phi\pi^{0}$. Since the isospin of X(1576) is $\mathbf{1}$, the
observation of $I_3=1$ or $I_3=-1$ states which predominantly decays into
strange mesons could provide another important test to our proposal. To search
the charged $I_3=1$ isospin partner associated with X(1576) in $J/\psi\to
\eta\pi^{+}\pi^{-}$, $J/\psi\to K^{+}K_{L}\pi^{-}$, $J/\psi\to
K^{+}K_{S}\pi^{-}$, $J/\psi\to \phi\pi^{+}\pi^{-}$ is suggested.
| [
{
"created": "Sun, 23 Jul 2006 14:44:21 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2006 16:27:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ding",
"Gui-Jun",
""
],
[
"Yan",
"Mu-Lin",
""
]
] | We propose that the broad $1^{--}$ resonance structure recently discovered by BES in $J/\psi\to K^{+}K^{-}\pi^{0}$ is the P-wave excitation of a diquark-antidiquark bound state. This interpretation implies that there exists a negative parity, vector nonet. A rough estimate of the mass spectrum of the nonet is presented, and the prediction for the mass of X(1576) is consistent with the experimental data. The OZI allowed strong decays are studied, it can decay into two pseudoscalars or one pseudoscalar plus one vector meson. A crucial prediction is that X(1576) should dominantly decay into $K^{+}K^{-}$, $K_{L}K_{S}$, $\phi\pi^{0}$. Since the isospin of X(1576) is $\mathbf{1}$, the observation of $I_3=1$ or $I_3=-1$ states which predominantly decays into strange mesons could provide another important test to our proposal. To search the charged $I_3=1$ isospin partner associated with X(1576) in $J/\psi\to \eta\pi^{+}\pi^{-}$, $J/\psi\to K^{+}K_{L}\pi^{-}$, $J/\psi\to K^{+}K_{S}\pi^{-}$, $J/\psi\to \phi\pi^{+}\pi^{-}$ is suggested. |
1707.09036 | Ursula Laa | Federico Ambrogi, Sabine Kraml, Suchita Kulkarni, Ursula Laa, Andre
Lessa, Wolfgang Waltenberger | On the coverage of the pMSSM by simplified model results | 29 pages, 13 figures, 5 tables, journal version | Eur. Phys. J. C (2018) 78: 215 | 10.1140/epjc/s10052-018-5660-0 | HEPHY-PUB 990/17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate to which extent the SUSY search results published by ATLAS and
CMS in the context of simplified models actually cover the more realistic
scenarios of a full model. Concretely, we work within the phenomenological MSSM
(pMSSM) with 19 free parameters and compare the constraints obtained from
SModelSv1.1.1 with those from the ATLAS pMSSM study in arXiv:1508.06608. We
find that about 40-45% of the points excluded by ATLAS escape the currently
available simplified model constraints. For these points we identify the most
relevant topologies which are not tested by the current simplified model
results. In particular, we find that topologies with asymmetric branches,
including 3-jet signatures from gluino-squark associated production, could be
important for improving the current constraining power of simplified models
results. Furthermore, for a better coverage of light stops and sbottoms,
constraints for decays via heavier neutralinos and charginos, which
subsequently decay visibly to the lightest neutralino are also needed.
| [
{
"created": "Thu, 27 Jul 2017 20:25:00 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Feb 2018 03:15:01 GMT",
"version": "v2"
}
] | 2018-03-21 | [
[
"Ambrogi",
"Federico",
""
],
[
"Kraml",
"Sabine",
""
],
[
"Kulkarni",
"Suchita",
""
],
[
"Laa",
"Ursula",
""
],
[
"Lessa",
"Andre",
""
],
[
"Waltenberger",
"Wolfgang",
""
]
] | We investigate to which extent the SUSY search results published by ATLAS and CMS in the context of simplified models actually cover the more realistic scenarios of a full model. Concretely, we work within the phenomenological MSSM (pMSSM) with 19 free parameters and compare the constraints obtained from SModelSv1.1.1 with those from the ATLAS pMSSM study in arXiv:1508.06608. We find that about 40-45% of the points excluded by ATLAS escape the currently available simplified model constraints. For these points we identify the most relevant topologies which are not tested by the current simplified model results. In particular, we find that topologies with asymmetric branches, including 3-jet signatures from gluino-squark associated production, could be important for improving the current constraining power of simplified models results. Furthermore, for a better coverage of light stops and sbottoms, constraints for decays via heavier neutralinos and charginos, which subsequently decay visibly to the lightest neutralino are also needed. |
1609.05922 | Davide Greco | Davide Greco and Kin Mimouni | The RG-improved Twin Higgs effective potential at NNLL | 28 pages, 6 figures | JHEP11(2016)108 | 10.1007/JHEP11(2016)108 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the Renormalization Group improvement of the Twin Higgs effective
potential at cubic order in logarithmic accuracy. We first introduce a
model-independent low-energy effective Lagrangian that captures both the
pseudo-Nambu-Goldstone boson nature of the Higgs field and the twin light
degrees of freedom charged under a copy of the Standard Model. We then apply
the background field method to systematically re-sum all the one loop diagrams
contributing to the potential. We show how this technique can be efficient to
implicitly renormalize the higher-dimensional operators in the twin sector
without classifying all of them. A prediction for the Higgs mass in the Twin
Higgs model is derived and found to be of the order of $M_H \sim 120
~\text{GeV}$ with an ultraviolet cut-off $m_*\sim 10-20 ~\text{TeV}$.
Irrespective of any possible ultraviolet completion of the low-energy
Lagrangian, the infrared degrees of freedom alone are therefore enough to
account for the observed value of the Higgs mass through running effects.
| [
{
"created": "Mon, 19 Sep 2016 20:09:55 GMT",
"version": "v1"
}
] | 2016-11-22 | [
[
"Greco",
"Davide",
""
],
[
"Mimouni",
"Kin",
""
]
] | We present the Renormalization Group improvement of the Twin Higgs effective potential at cubic order in logarithmic accuracy. We first introduce a model-independent low-energy effective Lagrangian that captures both the pseudo-Nambu-Goldstone boson nature of the Higgs field and the twin light degrees of freedom charged under a copy of the Standard Model. We then apply the background field method to systematically re-sum all the one loop diagrams contributing to the potential. We show how this technique can be efficient to implicitly renormalize the higher-dimensional operators in the twin sector without classifying all of them. A prediction for the Higgs mass in the Twin Higgs model is derived and found to be of the order of $M_H \sim 120 ~\text{GeV}$ with an ultraviolet cut-off $m_*\sim 10-20 ~\text{TeV}$. Irrespective of any possible ultraviolet completion of the low-energy Lagrangian, the infrared degrees of freedom alone are therefore enough to account for the observed value of the Higgs mass through running effects. |
0908.0159 | Brigitte Hiller | Brigitte Hiller, Wojciech Broniowski, Alexander A. Osipov, Alex H.
Blin | Quadrupole polarizabilities of the pion in the Nambu--Jona-Lasinio model | 9 pages, 1 fig | Phys.Lett.B681:147-150,2009 | 10.1016/j.physletb.2009.10.018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electromagnetic dipole and quadrupole polarizabilities of the neutral and
charged pions are calculated in the Nambu--Jona-Lasinio model. Our results
agree with the recent experimental analysis of these quantities based on
Dispersion Sum Rules. Comparison is made with the results from the Chiral
Perturbation Theory.
| [
{
"created": "Sun, 2 Aug 2009 21:07:35 GMT",
"version": "v1"
}
] | 2009-10-16 | [
[
"Hiller",
"Brigitte",
""
],
[
"Broniowski",
"Wojciech",
""
],
[
"Osipov",
"Alexander A.",
""
],
[
"Blin",
"Alex H.",
""
]
] | The electromagnetic dipole and quadrupole polarizabilities of the neutral and charged pions are calculated in the Nambu--Jona-Lasinio model. Our results agree with the recent experimental analysis of these quantities based on Dispersion Sum Rules. Comparison is made with the results from the Chiral Perturbation Theory. |
hep-ph/0212315 | Maria E. Tejeda-Yeomans | Maria Elena Tejeda-Yeomans (YITP, SUNY Stony Brook) | Two-loop QCD corrections for 2 to 2 parton scattering processes | Needs aipxfm.sty (included). Based on talk given at the X Mexican
School of Particles and Fields, Playa del Carmen, Mexico 2002 | AIP Conf.Proc. 670 (2003) 65-72 | 10.1063/1.1594320 | YITP-SB-02-78 | hep-ph | null | A summary is presented of the most recent matrix elements for massless 2 to 2
scattering processes calculated at two loops in QCD perturbation theory
together with a brief review on the calculational methods and techniques used.
| [
{
"created": "Fri, 20 Dec 2002 16:14:18 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Tejeda-Yeomans",
"Maria Elena",
"",
"YITP, SUNY Stony Brook"
]
] | A summary is presented of the most recent matrix elements for massless 2 to 2 scattering processes calculated at two loops in QCD perturbation theory together with a brief review on the calculational methods and techniques used. |
hep-ph/9305220 | David A. Kosower | W. T. Giele, E. W. N. Glover, and David A. Kosower | Single Lepton Production at Large Transverse Momentum | 5 pages (LaTeX) & 3 figures, Fermilab-Pub-93/086-T, CERN-TH.6868/93,
DTP/93/24 | Phys.Lett.B309:205-209,1993 | 10.1016/0370-2693(93)91528-U | null | hep-ph | null | We study the production of single isolated leptons at large transverse
momentum, $p_T^\ell > M_W/2$. The dominant source of such leptons is production
of an on-shell $W$ boson recoiling against a hard jet. Vetoing this jet forces
the $W$ boson to be produced off resonance and significantly reduces the
standard model cross section, thereby enhancing the discovery prospects for non
standard model physics. A significant number of events have the topologically
interesting signature of a large $p_T$ lepton balancing a jet with little
measured missing transverse energy.
| [
{
"created": "Thu, 6 May 1993 23:59:13 GMT",
"version": "v1"
},
{
"created": "Fri, 7 May 1993 15:32:28 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Giele",
"W. T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Kosower",
"David A.",
""
]
] | We study the production of single isolated leptons at large transverse momentum, $p_T^\ell > M_W/2$. The dominant source of such leptons is production of an on-shell $W$ boson recoiling against a hard jet. Vetoing this jet forces the $W$ boson to be produced off resonance and significantly reduces the standard model cross section, thereby enhancing the discovery prospects for non standard model physics. A significant number of events have the topologically interesting signature of a large $p_T$ lepton balancing a jet with little measured missing transverse energy. |
hep-ph/9810335 | Daniel Enstrom | Daniel Enstrom | Gamma-Ray Bursts and Dark Matter - a joint origin? | 9 pages, 2 figures, talk given at the 36th International School of
Subnuclear Physics, Erice, 29 Aug - 7 Sep 1998. To appear in the proceedings
Minor revision, correcting typographical errors | null | null | null | hep-ph | null | A scenario is presented where large quark-gluon plasma (QGP) objects escaping
the quark-hadron transition in the early Universe account for the baryonic dark
matter as well as act as the sources for gamma-ray bursts. Two basic
assumptions are made. Firstly, we assume that a QGP consisting of u,d and s
quarks is the absolute ground state of QCD and secondly, that the quark-hadron
transition in the early Universe was of first order. Both particle physics and
astrophysics constraints are discussed, mainly from an observational point of
view.
| [
{
"created": "Tue, 13 Oct 1998 08:18:24 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 1998 08:14:23 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Enstrom",
"Daniel",
""
]
] | A scenario is presented where large quark-gluon plasma (QGP) objects escaping the quark-hadron transition in the early Universe account for the baryonic dark matter as well as act as the sources for gamma-ray bursts. Two basic assumptions are made. Firstly, we assume that a QGP consisting of u,d and s quarks is the absolute ground state of QCD and secondly, that the quark-hadron transition in the early Universe was of first order. Both particle physics and astrophysics constraints are discussed, mainly from an observational point of view. |
2205.04486 | Paolo Panci | Salvatore Bottaro, Dario Buttazzo, Marco Costa, Roberto Franceschini,
Paolo Panci, Diego Redigolo, Ludovico Vittorio | The last Complex WIMPs standing | 15 pages + appendices, 6 + 6 figures, 1 + 3 tables | null | 10.1140/epjc/s10052-022-10918-5 | CERN-TH-2022-080 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue the study of weakly interacting massive particles (WIMP) started
in [arXiv:2107.09688], focusing on a single complex electroweak $n$-plet with
non-zero hypercharge added to the Standard Model. The minimal splitting between
the Dark Matter and its electroweak neutral partner required to circumvent
direct detection constraints allows only multiplets with hypercharge smaller or
equal to 1. We compute for the first time all the calculable WIMP masses up to
the largest multiplet allowed by perturbative unitarity. For the minimal
allowed splitting, most of these multiplets can be fully probed at future
large-exposure direct detection experiments, with the notable exception of the
doublet with hypercharge 1/2. We show how a future muon collider can fully
explore the parameter space of the complex doublet combining missing mass,
displaced track and long-lived track searches. In the same spirit, we study how
a future muon collider can probe the parameter space of complex WIMPs in
regions where the direct detection cross section drops below the neutrino
floor. Finally, we comment on how precision observables can provide additional
constraints on complex WIMPs.
| [
{
"created": "Mon, 9 May 2022 18:00:12 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Bottaro",
"Salvatore",
""
],
[
"Buttazzo",
"Dario",
""
],
[
"Costa",
"Marco",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Panci",
"Paolo",
""
],
[
"Redigolo",
"Diego",
""
],
[
"Vittorio",
"Ludovico",
""
... | We continue the study of weakly interacting massive particles (WIMP) started in [arXiv:2107.09688], focusing on a single complex electroweak $n$-plet with non-zero hypercharge added to the Standard Model. The minimal splitting between the Dark Matter and its electroweak neutral partner required to circumvent direct detection constraints allows only multiplets with hypercharge smaller or equal to 1. We compute for the first time all the calculable WIMP masses up to the largest multiplet allowed by perturbative unitarity. For the minimal allowed splitting, most of these multiplets can be fully probed at future large-exposure direct detection experiments, with the notable exception of the doublet with hypercharge 1/2. We show how a future muon collider can fully explore the parameter space of the complex doublet combining missing mass, displaced track and long-lived track searches. In the same spirit, we study how a future muon collider can probe the parameter space of complex WIMPs in regions where the direct detection cross section drops below the neutrino floor. Finally, we comment on how precision observables can provide additional constraints on complex WIMPs. |
hep-ph/9903253 | Orlando Panella | O. Panella (1), C. Carimalo (2) and Y.N. Srivastava (1,3) ((1) INFN,
Sezione di Perugia (2) LPNHE -IN2P3 CNRS-, Univeristes de Paris VI/VII) | Production of Like Sign Di-Leptons in p-p Collisions Through Composite
Majorana Neutrinos | Revtex style, 31 pages, 8 postscript figures. Few typos corrected | Phys.Rev. D62 (2000) 015013 | 10.1103/PhysRevD.62.015013 | null | hep-ph | null | The production of Like-Sign-Di-leptons (LSD), in the high energy lepton
number violating ($\Delta L = +2$) reaction, p p --> 2jets + l+l+
(l=e,\mu,\tau) of interest for the experiments to be performed at the
forthcoming Large Hadron Collider (LHC), is investigated in detail, taking up a
composite model scenario in which the exchanged virtual composite neutrino is
assumed to be a Majorana particle that couples to the light leptons via the
$SU(2)\times U(1)$ gauge bosons through a magnetic type coupling
($\sigma_{\mu\nu}$). An helicity projection method is used to evaluate exactly
the tree-level amplitudes of the contributing parton subprocesses ($2\to 4$),
which allows to take into account all exchange diagrams and occurring
interferences. Numerical estimates of the corresponding signal cross-section
that implement kinematical cuts needed to suppress the Standard Model
background, are presented which show that in some regions of the parameter
space the total number of LSD events is well above the background. Assuming
non-observation of the LSD signal it is found that LHC would exclude a
composite Majorana neutrino up to 850 GeV (if one requires 10 events for
discovery). The sensitivity of LHC experiments to the parameter space is then
compared to that of the next generation of neutrinoless double beta decay
($\beta\beta_{0\nu}$) experiment, GENIUS, and it is shown that they will
provide constraints of the same order of magnitude and will play a
complementary role.
| [
{
"created": "Wed, 3 Mar 1999 21:13:50 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 1999 15:15:15 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Panella",
"O.",
""
],
[
"Carimalo",
"C.",
""
],
[
"Srivastava",
"Y. N.",
""
]
] | The production of Like-Sign-Di-leptons (LSD), in the high energy lepton number violating ($\Delta L = +2$) reaction, p p --> 2jets + l+l+ (l=e,\mu,\tau) of interest for the experiments to be performed at the forthcoming Large Hadron Collider (LHC), is investigated in detail, taking up a composite model scenario in which the exchanged virtual composite neutrino is assumed to be a Majorana particle that couples to the light leptons via the $SU(2)\times U(1)$ gauge bosons through a magnetic type coupling ($\sigma_{\mu\nu}$). An helicity projection method is used to evaluate exactly the tree-level amplitudes of the contributing parton subprocesses ($2\to 4$), which allows to take into account all exchange diagrams and occurring interferences. Numerical estimates of the corresponding signal cross-section that implement kinematical cuts needed to suppress the Standard Model background, are presented which show that in some regions of the parameter space the total number of LSD events is well above the background. Assuming non-observation of the LSD signal it is found that LHC would exclude a composite Majorana neutrino up to 850 GeV (if one requires 10 events for discovery). The sensitivity of LHC experiments to the parameter space is then compared to that of the next generation of neutrinoless double beta decay ($\beta\beta_{0\nu}$) experiment, GENIUS, and it is shown that they will provide constraints of the same order of magnitude and will play a complementary role. |
1511.02764 | Igor Ivanov | G. C. Branco, I. P. Ivanov | Group-theoretic restrictions on generation of CP-violation in
multi-Higgs-doublet models | 16 pages | null | 10.1007/JHEP01(2016)116 | CFTP/15-012 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been known since decades that imposing a symmetry group G on the
scalar sector of multi-Higgs-doublet models has consequences for CP-violation.
In all examples of two- and three-Higgs-doublet models equipped with
symmetries, one observes the following intriguing property: if G prevents
explicit CP-violation (CPV), at least in the neutral Higgs sector, then it also
prevents spontaneous CPV, and if G allows explicit CPV, then it allows for
spontaneous CPV. One is led to conjecture that this is a general phenomenon. In
this paper, we prove this conjecture for any rephasing symmetry group G and any
number of doublets.
| [
{
"created": "Mon, 9 Nov 2015 17:18:04 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Branco",
"G. C.",
""
],
[
"Ivanov",
"I. P.",
""
]
] | It has been known since decades that imposing a symmetry group G on the scalar sector of multi-Higgs-doublet models has consequences for CP-violation. In all examples of two- and three-Higgs-doublet models equipped with symmetries, one observes the following intriguing property: if G prevents explicit CP-violation (CPV), at least in the neutral Higgs sector, then it also prevents spontaneous CPV, and if G allows explicit CPV, then it allows for spontaneous CPV. One is led to conjecture that this is a general phenomenon. In this paper, we prove this conjecture for any rephasing symmetry group G and any number of doublets. |
hep-ph/0612109 | Igor Lokhtin P. | I.P. Lokhtin and A.M. Snigirev | Simulation of jet quenching at RHIC and LHC | Talk given at 19th International Conference on Ultra-Relativistic
Nucleus-Nucleus Collisions "Quark Matter 2006" (Shanghai, China, November
14-20, 2006); 4 pages including 2 figures as EPS-files; prepared using LaTeX
package for Journal of Physics J | J.Phys.G34:S999-1004,2007 | 10.1088/0954-3899/34/8/S143 | null | hep-ph | null | The model to simulate jet quenching effect in ultrarelativistic heavy ion
collisions is presented. The model is the fast Monte-Carlo tool implemented to
modify a standard PYTHIA jet event. The model has been generalized to the case
of the "full" heavy ion event (the superposition of soft, hydro-type state and
hard multi-jets) using a simple and fast simulation procedure for soft particle
production. The model is capable of reproducing main features of the jet
quenching pattern at RHIC and is applyed to analyze novel jet quenching
features at LHC.
| [
{
"created": "Sun, 10 Dec 2006 13:16:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lokhtin",
"I. P.",
""
],
[
"Snigirev",
"A. M.",
""
]
] | The model to simulate jet quenching effect in ultrarelativistic heavy ion collisions is presented. The model is the fast Monte-Carlo tool implemented to modify a standard PYTHIA jet event. The model has been generalized to the case of the "full" heavy ion event (the superposition of soft, hydro-type state and hard multi-jets) using a simple and fast simulation procedure for soft particle production. The model is capable of reproducing main features of the jet quenching pattern at RHIC and is applyed to analyze novel jet quenching features at LHC. |
hep-ph/0312212 | Hubert Spiesberger | S. Ciulli, C. Sebu, K. Schilcher, H. Spiesberger | QCD condensates from tau-decay data: A functional approach | LaTeX, 9 pages, Acknowledgment added | Phys.Lett. B595 (2004) 359-367 | 10.1016/j.physletb.2004.06.046 | MZ-TH/03-21 | hep-ph | null | We study a functional method to extract the V-A condensate of dimension 6
from a comparison of tau-decay data with the asymptotic space-like QCD
prediction. Our result is in agreement within errors with that from
conventional analyses based on finite energy sum rules.
| [
{
"created": "Tue, 16 Dec 2003 12:56:23 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jan 2004 17:28:37 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ciulli",
"S.",
""
],
[
"Sebu",
"C.",
""
],
[
"Schilcher",
"K.",
""
],
[
"Spiesberger",
"H.",
""
]
] | We study a functional method to extract the V-A condensate of dimension 6 from a comparison of tau-decay data with the asymptotic space-like QCD prediction. Our result is in agreement within errors with that from conventional analyses based on finite energy sum rules. |
hep-ph/9811463 | Q. Shafi | Qaisar Shafi and Zurab Tavartkiladze | Atmospheric and Solar Neutrino Oscillations in \nuMSSM and Beyond | 14 pp, LATEX. Typos are corrected, possibilities of the neutrino HDM
in various scenarios are emphasized | Phys.Lett.B448:46-56,1999 | 10.1016/S0370-2693(99)00037-4 | BA-98-53 | hep-ph | null | We show how a unified description of the various two-flavor neutrino
oscillation solutions, allowed by the atmospheric and solar neutrino
experiments, are naturally realized within the framework of $\nu$MSSM (MSSM
augmented with the seesaw mechanism) and beyond, especially grand unified
theories. A general mechanism for achieving maximal mixing to resolve the
atmospheric anomaly is discussed, and applied to the flipped SU(5) model.
Except in the case of MSSM and SU(5), a light sterile neutrino is an inevitable
consequence of our considerations. The bi-maximal neutrino mixing scenario is
one of the options considered. Neutrino hot dark matter can arise in models
with maximal $\nu_{\mu}-\nu_s$ oscillations. A ${\cal U}(1)$ flavor symmetry,
motivated by the charged fermion mass hierarchies and the magnitudes of the CKM
matrix elements, plays a central role.
| [
{
"created": "Wed, 25 Nov 1998 17:01:02 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 1999 19:43:28 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Feb 1999 19:48:18 GMT",
"version": "v3"
}
] | 2011-05-12 | [
[
"Shafi",
"Qaisar",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] | We show how a unified description of the various two-flavor neutrino oscillation solutions, allowed by the atmospheric and solar neutrino experiments, are naturally realized within the framework of $\nu$MSSM (MSSM augmented with the seesaw mechanism) and beyond, especially grand unified theories. A general mechanism for achieving maximal mixing to resolve the atmospheric anomaly is discussed, and applied to the flipped SU(5) model. Except in the case of MSSM and SU(5), a light sterile neutrino is an inevitable consequence of our considerations. The bi-maximal neutrino mixing scenario is one of the options considered. Neutrino hot dark matter can arise in models with maximal $\nu_{\mu}-\nu_s$ oscillations. A ${\cal U}(1)$ flavor symmetry, motivated by the charged fermion mass hierarchies and the magnitudes of the CKM matrix elements, plays a central role. |
hep-ph/9503322 | A. A. Penin | A.A.Penin and A.A.Pivovarov | Extended analysis of the "penguin" part of $K\to\pi\pi$ amplitude | LaTeX file. | Int.J.Mod.Phys. A10 (1995) 4065-4086 | 10.1142/S0217751X95001881 | Preprint KEK-TH-398, Jun 1994 | hep-ph | null | We make an attempt to clarify the role of the annihilation or "penguin" mode
in the description of the $K\rightarrow\pi\pi$ decay within the Standard Model.
The attention is concentrated on new operators in the effective $\Delta S=1$
Hamiltonian and the violation of factorization for mesonic matrix elements of
the local four-quark operators. We propose a regular method to evaluate the
mesonic matrix elements of $K\rightarrow\pi\pi$ transitions based on studying
three-point correlators via {\it QCD} sum rules using the chiral effective
theory as an underlying low-energy model for strong interaction. Matrix
elements of the {\it QCD} penguin operator are calculated within this approach.
The total "penguin" contribution is found to be relatively large that improves
the theoretical description of the $\Delta I=1/2$ rule in non-leptonic kaon
decays.
| [
{
"created": "Tue, 14 Mar 1995 09:29:58 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Penin",
"A. A.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] | We make an attempt to clarify the role of the annihilation or "penguin" mode in the description of the $K\rightarrow\pi\pi$ decay within the Standard Model. The attention is concentrated on new operators in the effective $\Delta S=1$ Hamiltonian and the violation of factorization for mesonic matrix elements of the local four-quark operators. We propose a regular method to evaluate the mesonic matrix elements of $K\rightarrow\pi\pi$ transitions based on studying three-point correlators via {\it QCD} sum rules using the chiral effective theory as an underlying low-energy model for strong interaction. Matrix elements of the {\it QCD} penguin operator are calculated within this approach. The total "penguin" contribution is found to be relatively large that improves the theoretical description of the $\Delta I=1/2$ rule in non-leptonic kaon decays. |
1609.05072 | Emanuele Angelo Bagnaschi | Emanuele Bagnaschi | Matching uncertainties in the prediction of the Higgs boson transverse
momentum in the SM and beyond | 10 pages, 7 figures. Contribution to the proceedings of LHCP2016 | PoS(LHCP2016)077 | null | DESY 16-173 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present the results of our recent study (arXiv:1510.08850) of the
theoretical uncertainties that affect the predictions for the Higgs-boson
transverse-momentum in gluon fusion when fixed- and all-order results are
matched. Our investigation consists of a twofold analysis: first we present a
detailed comparison of two recently introduced prescriptions for the
determination of the matching scale (arXiv:1409.0531, arXiv:1505.00735), then
we apply the results of these methods to three widely used matching frameworks,
namely the aMC@NLO and POWHEG Monte Carlo approaches and analytic resummation.
The results of our study are applied to the production of the SM Higgs boson
and of the neutral Higgs bosons of the Two-Higgs-Doublet Model in a variety of
scenarios.
| [
{
"created": "Fri, 16 Sep 2016 14:19:45 GMT",
"version": "v1"
}
] | 2016-09-19 | [
[
"Bagnaschi",
"Emanuele",
""
]
] | We present the results of our recent study (arXiv:1510.08850) of the theoretical uncertainties that affect the predictions for the Higgs-boson transverse-momentum in gluon fusion when fixed- and all-order results are matched. Our investigation consists of a twofold analysis: first we present a detailed comparison of two recently introduced prescriptions for the determination of the matching scale (arXiv:1409.0531, arXiv:1505.00735), then we apply the results of these methods to three widely used matching frameworks, namely the aMC@NLO and POWHEG Monte Carlo approaches and analytic resummation. The results of our study are applied to the production of the SM Higgs boson and of the neutral Higgs bosons of the Two-Higgs-Doublet Model in a variety of scenarios. |
1207.4842 | Lei Guo | Zhang Shi-Ming, Zhang Ren-You, Ma Wen-Gan and Guo Lei | Associated $Z^0H^0$ production with leptonic decays at LHC in
next-to-leading order QCD | 26 pages, 11 figures | Phys. Rev. D 86, 034018 (2012) | 10.1103/PhysRevD.86.034018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the effects of the littlest Higgs model (LHM) up
to the QCD next-to-leading order (NLO) on the $Z^0H^0$ associated production at
the CERN Large Hadron Collider (LHC). We study the dependences of the leading
order and NLO QCD corrected integrated cross sections for this process on the
factorization/renormalization scale and the LHM parameters. We also provide the
distributions of the transverse momenta of final decay products $\mu^-$ and
$\tau^-$. Our results show that the heavy neutral gauge bosons $Z_H$ and $A_H$
could induce significant discrepancies from the standard model predictions. It
is found that when the LHM parameters are taken as $c=0.5$, $c^{\prime}=0.22$,
$f=4 TeV$ and $\mu=(M_H+M_Z)/2$, the effects at the $\sqrt{s}=14 TeV$ LHC from
the heavy neutral gauge boson are about 12.83% and 10.37% to the leading order
and NLO QCD corrected integrated cross sections, respectively. We also conclude
that the NLO QCD corrections at the $\sqrt{s}=14 TeV$ LHC can obviously reduce
the scale uncertainty of the integrated cross section, and significantly
enhance the differential cross sections of $p_T^{\mu^-}$ and $p_T^{\tau^-}$. It
demonstrates that the precision measurement of the $Z^0H^0$ associated
production process at the LHC could provide the clue of the LHM physics.
| [
{
"created": "Fri, 20 Jul 2012 02:27:41 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2012 03:03:14 GMT",
"version": "v2"
}
] | 2012-08-22 | [
[
"Shi-Ming",
"Zhang",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Lei",
"Guo",
""
]
] | In this work we investigate the effects of the littlest Higgs model (LHM) up to the QCD next-to-leading order (NLO) on the $Z^0H^0$ associated production at the CERN Large Hadron Collider (LHC). We study the dependences of the leading order and NLO QCD corrected integrated cross sections for this process on the factorization/renormalization scale and the LHM parameters. We also provide the distributions of the transverse momenta of final decay products $\mu^-$ and $\tau^-$. Our results show that the heavy neutral gauge bosons $Z_H$ and $A_H$ could induce significant discrepancies from the standard model predictions. It is found that when the LHM parameters are taken as $c=0.5$, $c^{\prime}=0.22$, $f=4 TeV$ and $\mu=(M_H+M_Z)/2$, the effects at the $\sqrt{s}=14 TeV$ LHC from the heavy neutral gauge boson are about 12.83% and 10.37% to the leading order and NLO QCD corrected integrated cross sections, respectively. We also conclude that the NLO QCD corrections at the $\sqrt{s}=14 TeV$ LHC can obviously reduce the scale uncertainty of the integrated cross section, and significantly enhance the differential cross sections of $p_T^{\mu^-}$ and $p_T^{\tau^-}$. It demonstrates that the precision measurement of the $Z^0H^0$ associated production process at the LHC could provide the clue of the LHM physics. |
hep-ph/9909229 | Ralf Rapp | R. Rapp and J. Wambach | Chiral Symmetry Restoration and Dileptons in Relativistic Heavy-Ion
Collisions | 164 pages LaTeX including 88 eps-/ps-figures, Review Article to
appear in Adv. Nucl. Phys | Adv.Nucl.Phys. 25 (2000) 1 | null | SUNY-NTG-99-29 | hep-ph nucl-th | null | The current theoretical status in the analysis and interpretation of low-mass
dilepton measurements in (ultra-) relativistic heavy-ion experiments is
reviewed. Special emphasis is put on potential signals of (partial) restoration
of dynamically broken chiral symmetry in a hot and dense hadronic medium. It
follows from chiral symmetry alone that parity partners of hadronic correlation
functions must become identical when the symmetry is restored. The assessment
of medium effects in the vector channel, which governs the dilepton production,
thus necessitates a simultaneous treatment of the vector and axialvector
degrees of freedom. While significant progress in this respect has been made
some open questions remain in establishing a rigorous link in the mass region
below 1 GeV. From the present calculations a suggestive 'quark-hadron duality'
emerges near the phase boundary. It implies substantial medium effects in the
dilepton signal from the hadronic phase which smoothly matches a perturbative
description within the plasma phase.
| [
{
"created": "Thu, 2 Sep 1999 15:41:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rapp",
"R.",
""
],
[
"Wambach",
"J.",
""
]
] | The current theoretical status in the analysis and interpretation of low-mass dilepton measurements in (ultra-) relativistic heavy-ion experiments is reviewed. Special emphasis is put on potential signals of (partial) restoration of dynamically broken chiral symmetry in a hot and dense hadronic medium. It follows from chiral symmetry alone that parity partners of hadronic correlation functions must become identical when the symmetry is restored. The assessment of medium effects in the vector channel, which governs the dilepton production, thus necessitates a simultaneous treatment of the vector and axialvector degrees of freedom. While significant progress in this respect has been made some open questions remain in establishing a rigorous link in the mass region below 1 GeV. From the present calculations a suggestive 'quark-hadron duality' emerges near the phase boundary. It implies substantial medium effects in the dilepton signal from the hadronic phase which smoothly matches a perturbative description within the plasma phase. |
0711.3118 | Javier Vijande Asenjo | J. Vijande, E. Weissman, A. Valcarce, N. Barnea | On the existence of exotic and non-exotic multiquark meson states | 3 pages. Contribution to the 20th European Conference on Few-Body
Problems in Physics, Pisa, Italy. To be published in Few-Body systems | Few Body Syst.44:99-101,2008 | 10.1007/s00601-008-0266-y | null | hep-ph hep-ex | null | To obtain an exact solution of a four-body system containing two quarks and
two antiquarks interacting through two-body terms is a cumbersome task that has
been tackled with more or less success during the last decades. We present an
exact method for the study of four-quark systems based on the hyperspherical
harmonics formalism that allows us to solve it without resorting to further
approximations, like for instance the existence of diquark components. We apply
it to systems containing two heavy and two light quarks using different
quark-quark potentials. While $QQ\bar n \bar n$ states may be stable in nature,
the stability of $Q\bar Qn \bar n$ states would imply the existence of quark
correlations not taken into account by simple quark dynamical models.
| [
{
"created": "Tue, 20 Nov 2007 12:07:34 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Vijande",
"J.",
""
],
[
"Weissman",
"E.",
""
],
[
"Valcarce",
"A.",
""
],
[
"Barnea",
"N.",
""
]
] | To obtain an exact solution of a four-body system containing two quarks and two antiquarks interacting through two-body terms is a cumbersome task that has been tackled with more or less success during the last decades. We present an exact method for the study of four-quark systems based on the hyperspherical harmonics formalism that allows us to solve it without resorting to further approximations, like for instance the existence of diquark components. We apply it to systems containing two heavy and two light quarks using different quark-quark potentials. While $QQ\bar n \bar n$ states may be stable in nature, the stability of $Q\bar Qn \bar n$ states would imply the existence of quark correlations not taken into account by simple quark dynamical models. |
2401.12829 | Andres Lopez Moreno Mr | Andres Lopez Moreno | A non-unitary solar constraint for long-baseline neutrino experiments | 8 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Long-baseline neutrino oscillation experiments require external constraints
on $\sin^2\theta_{12}$ and $\Delta m_{21}^2$ to make precision measurements of
the leptonic mixing matrix. These constraints come from measurements of the
Mikheyev-Smirnov-Wolfenstein (MSW) mixing in solar neutrinos. Here we develop
an MSW large mixing angle approximation in the presence of heavy neutral
leptons which adds a single new parameter ($\alpha_{11}$) representing the
magnitude of the mixing between the $\nu_e$ state and the heavy sector. We use
data from the Borexino, SNO and KamLAND collaborations to find a solar
constraint appropriate for heavy neutral lepton searches in long-baseline
oscillation experiments. Solar data limits the magnitude of the non-unitary
parameter to $(1-\alpha_{11}) < 0.046$ at the $99\%$ credible interval and
yields a strongly correlated constraint on the solar mass splitting and the
magnitude of $\nu_e$ non-unitary mixing.
| [
{
"created": "Tue, 23 Jan 2024 15:06:55 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2024 18:46:09 GMT",
"version": "v2"
}
] | 2024-02-05 | [
[
"Moreno",
"Andres Lopez",
""
]
] | Long-baseline neutrino oscillation experiments require external constraints on $\sin^2\theta_{12}$ and $\Delta m_{21}^2$ to make precision measurements of the leptonic mixing matrix. These constraints come from measurements of the Mikheyev-Smirnov-Wolfenstein (MSW) mixing in solar neutrinos. Here we develop an MSW large mixing angle approximation in the presence of heavy neutral leptons which adds a single new parameter ($\alpha_{11}$) representing the magnitude of the mixing between the $\nu_e$ state and the heavy sector. We use data from the Borexino, SNO and KamLAND collaborations to find a solar constraint appropriate for heavy neutral lepton searches in long-baseline oscillation experiments. Solar data limits the magnitude of the non-unitary parameter to $(1-\alpha_{11}) < 0.046$ at the $99\%$ credible interval and yields a strongly correlated constraint on the solar mass splitting and the magnitude of $\nu_e$ non-unitary mixing. |
1611.08379 | Yun Guo | Qianqian Du, Adrian Dumitru, Yun Guo, and Michael Strickland | Bulk viscous corrections to screening and damping in QCD at high
temperatures | 19 pages. no figure, added corrections of quadratic order in the bulk
pressure to the symmetric gluon self energy, to appear in JHEP | null | 10.1007/JHEP01(2017)123 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-equilibrium corrections to the distribution functions of quarks and
gluons in a hot and dense QCD medium modify the "hard thermal loops" (HTL). The
HTLs determine the retarded, advanced, and symmetric (time-ordered) propagators
for gluons with soft momenta as well as the Debye screening and Landau damping
mass scales. We compute such corrections to a thermal as well as to a
non-thermal fixed point.The screening and damping mass scales are sensitive to
the bulk pressure and hence to (pseudo-) critical dynamical scaling of the bulk
viscosity in the vicinity of a second-order critical point. This could be
reflected in the properties of quarkonium bound states in the deconfined phase
and in the dynamics of soft gluon fields.
| [
{
"created": "Fri, 25 Nov 2016 08:23:13 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2017 09:48:48 GMT",
"version": "v2"
}
] | 2017-03-08 | [
[
"Du",
"Qianqian",
""
],
[
"Dumitru",
"Adrian",
""
],
[
"Guo",
"Yun",
""
],
[
"Strickland",
"Michael",
""
]
] | Non-equilibrium corrections to the distribution functions of quarks and gluons in a hot and dense QCD medium modify the "hard thermal loops" (HTL). The HTLs determine the retarded, advanced, and symmetric (time-ordered) propagators for gluons with soft momenta as well as the Debye screening and Landau damping mass scales. We compute such corrections to a thermal as well as to a non-thermal fixed point.The screening and damping mass scales are sensitive to the bulk pressure and hence to (pseudo-) critical dynamical scaling of the bulk viscosity in the vicinity of a second-order critical point. This could be reflected in the properties of quarkonium bound states in the deconfined phase and in the dynamics of soft gluon fields. |
1503.04900 | Hiroyuki Nishiura | Yoshio Koide and Hiroyuki Nishiura | Origin of Hierarchical Structures of Quark and Lepton Mass Matrices | 24 pages, 2 figures | Phys.Rev. D 91, 116002 (2015) | 10.1103/PhysRevD.91.116002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the so-called "Yukawaon" model can give a unified
description of masses, mixing and $CP$ violation parameters of quarks and
leptons without using any hierarchical (family number-dependent) parameters
besides the charged lepton masses. Here, we have introduced a phase matrix
$P={\rm daig}(e^{i \phi_1}, e^{i \phi_2}, e^{i \phi_3})$ with the phase
parameters $(\phi_1, \phi_2, \phi_3)$ which are described in terms of family
number-independent parameters, together with using only the charged lepton mass
parameters as the family number-dependent parameters. In this paper, the $CP$
violating phase parameters $\delta_{CP}^q$ and $\delta_{CP}^\ell$ in the
standard expression of $V_{CKM}$ and $U_{PMNS}$ are predicted as $\delta_{CP}^q
\simeq 72^\circ$ and $\delta_{CP}^\ell \simeq -76^\circ$, respectively, i.e.
$\delta_{CP}^\ell \sim - \delta_{CP}^q$.
| [
{
"created": "Tue, 17 Mar 2015 03:15:32 GMT",
"version": "v1"
}
] | 2015-10-22 | [
[
"Koide",
"Yoshio",
""
],
[
"Nishiura",
"Hiroyuki",
""
]
] | It is shown that the so-called "Yukawaon" model can give a unified description of masses, mixing and $CP$ violation parameters of quarks and leptons without using any hierarchical (family number-dependent) parameters besides the charged lepton masses. Here, we have introduced a phase matrix $P={\rm daig}(e^{i \phi_1}, e^{i \phi_2}, e^{i \phi_3})$ with the phase parameters $(\phi_1, \phi_2, \phi_3)$ which are described in terms of family number-independent parameters, together with using only the charged lepton mass parameters as the family number-dependent parameters. In this paper, the $CP$ violating phase parameters $\delta_{CP}^q$ and $\delta_{CP}^\ell$ in the standard expression of $V_{CKM}$ and $U_{PMNS}$ are predicted as $\delta_{CP}^q \simeq 72^\circ$ and $\delta_{CP}^\ell \simeq -76^\circ$, respectively, i.e. $\delta_{CP}^\ell \sim - \delta_{CP}^q$. |
2101.08202 | Dr. Rukmani Mohanta | Rudra Majhi, Dinesh Kumar Singha, K. N. Deepthi, Rukmani Mohanta | Constraining CPT violation with Hyper-Kamiokande and ESSnuSB | 15 pages, 5 figures, version to appear in Phys. Rev. D | Phys. Rev. D 104, 055002 (2021) | 10.1103/PhysRevD.104.055002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CPT invariance is one of the most fundamental symmetries in nature and it
plays a major role in the formulation of Quantum Field Theory. Although no
definitive signal of CPT violation has been observed so far, there are many
reasons to carefully investigate various low-energy phenomena that can provide
better probes to test CPT symmetry. In this context, neutrino experiments are
expected to provide more stringent bounds on CPT invariance violation when
compared to the existing bounds from the Kaon system. In this work, we
investigate the sensitivity of the upcoming long-baseline experiments: Hyper
Kamiokande (T2HK, T2HKK), ESSnuSB and DUNE to constrain the CPT violating
parameters $\Delta(\delta_{CP})$, $\Delta(m^2_{31})$ and $\Delta(\sin^2
\theta_{23})$, which characterize the difference between neutrino and
antineutrino oscillation parameters. Further, we analyse neutrino and
antineutrino data independently and constrain the oscillation parameters
governing them by considering the combination of these experiments (DUNE+T2HKK
and DUNE+ESSnuSB). In addition, assuming CPT symmetry is violated in nature, we
study the individual ability of the aforementioned experiments to establish CPT
violation. We found that the experiments Hyper-K (T2HK, T2HKK) and ESSnuSB,
along with DUNE, will be able to establish CPT violation in their proposed
run-times.
| [
{
"created": "Wed, 20 Jan 2021 16:23:50 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jul 2021 03:50:15 GMT",
"version": "v2"
}
] | 2021-09-15 | [
[
"Majhi",
"Rudra",
""
],
[
"Singha",
"Dinesh Kumar",
""
],
[
"Deepthi",
"K. N.",
""
],
[
"Mohanta",
"Rukmani",
""
]
] | CPT invariance is one of the most fundamental symmetries in nature and it plays a major role in the formulation of Quantum Field Theory. Although no definitive signal of CPT violation has been observed so far, there are many reasons to carefully investigate various low-energy phenomena that can provide better probes to test CPT symmetry. In this context, neutrino experiments are expected to provide more stringent bounds on CPT invariance violation when compared to the existing bounds from the Kaon system. In this work, we investigate the sensitivity of the upcoming long-baseline experiments: Hyper Kamiokande (T2HK, T2HKK), ESSnuSB and DUNE to constrain the CPT violating parameters $\Delta(\delta_{CP})$, $\Delta(m^2_{31})$ and $\Delta(\sin^2 \theta_{23})$, which characterize the difference between neutrino and antineutrino oscillation parameters. Further, we analyse neutrino and antineutrino data independently and constrain the oscillation parameters governing them by considering the combination of these experiments (DUNE+T2HKK and DUNE+ESSnuSB). In addition, assuming CPT symmetry is violated in nature, we study the individual ability of the aforementioned experiments to establish CPT violation. We found that the experiments Hyper-K (T2HK, T2HKK) and ESSnuSB, along with DUNE, will be able to establish CPT violation in their proposed run-times. |
1604.05985 | Gines Perez Teruel | Gin\'es R. P\'erez Teruel | Generalization of the Majorana equation for real spinors | null | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Dirac equation for real spinors can be naturally decomposed
into a system of two first-order relativistic wave equations. The decomposition
separates in a transparent way the real and imaginary parts of the Dirac
equation by means of two algebraic differential operators, allowing to describe
real spinors in any representation of the Dirac matrices maintaining the
reality condition $\tilde{\Psi}=\tilde{\Psi}^{*}$ unaltered. In addition, it is
shown that the Majorana wave equation is a particular case of the relativistic
system of equations deduced in this paper. We also briefly discuss how the
formalism can be extended to deal with complex (charged) spinors.
| [
{
"created": "Wed, 20 Apr 2016 14:52:18 GMT",
"version": "v1"
}
] | 2016-04-21 | [
[
"Teruel",
"Ginés R. Pérez",
""
]
] | We show that the Dirac equation for real spinors can be naturally decomposed into a system of two first-order relativistic wave equations. The decomposition separates in a transparent way the real and imaginary parts of the Dirac equation by means of two algebraic differential operators, allowing to describe real spinors in any representation of the Dirac matrices maintaining the reality condition $\tilde{\Psi}=\tilde{\Psi}^{*}$ unaltered. In addition, it is shown that the Majorana wave equation is a particular case of the relativistic system of equations deduced in this paper. We also briefly discuss how the formalism can be extended to deal with complex (charged) spinors. |
1005.4839 | Korinna Zapp | V.A. Khoze, F. Krauss, A.D. Martin, M.G. Ryskin, K.C. Zapp | Diffraction and correlations at the LHC: definitions and observables | 19 pages, 8 figures; v2: minor changes, version accepted by EPJC | Eur.Phys.J.C69:85-93,2010 | 10.1140/epjc/s10052-010-1392-5 | IPPP/10/38, DCPT/10/76, MCnet/10/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We note that the definition of diffractive events is a matter of convention.
We discuss two possible `definitions': one based on unitarity and the other on
Large Rapidity Gaps (LRG) or Pomeron exchange. LRG can also arise from
fluctuations and we quantify this effect and some of the related uncertainties.
We find care must be taken in extracting the Pomeron contribution from LRG
events. We show that long-range correlations in multiplicities can arise from
the same multi-Pomeron diagrams that are responsible for LRG events, and
explain how early LHC data can illuminate our understanding of `soft'
interactions.
| [
{
"created": "Wed, 26 May 2010 15:08:26 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Aug 2010 09:55:19 GMT",
"version": "v2"
}
] | 2011-03-04 | [
[
"Khoze",
"V. A.",
""
],
[
"Krauss",
"F.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Zapp",
"K. C.",
""
]
] | We note that the definition of diffractive events is a matter of convention. We discuss two possible `definitions': one based on unitarity and the other on Large Rapidity Gaps (LRG) or Pomeron exchange. LRG can also arise from fluctuations and we quantify this effect and some of the related uncertainties. We find care must be taken in extracting the Pomeron contribution from LRG events. We show that long-range correlations in multiplicities can arise from the same multi-Pomeron diagrams that are responsible for LRG events, and explain how early LHC data can illuminate our understanding of `soft' interactions. |
1503.03099 | Hugues Beauchesne HB | Hugues Beauchesne, Kevin Earl, Thomas Gregoire | LHC constraints on Mini-Split anomaly and gauge mediation and prospects
for LHC 14 and a future 100 TeV pp collider | 25 pages, 10 figures, references added, LHC 14 results added, matched
to journal version | null | 10.1007/JHEP08(2015)117 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stringent experimental constraints have raised the lower limit on the masses
of squarks to TeV levels, while compatibility with the mass of the Higgs boson
provides an upper limit. This two-sided bound has lead to the emergence of
Mini-Split theories where gauginos are not far removed from the electroweak
scale while scalars are somewhat heavier. This small hierarchy modifies the
spectrum of standard anomaly and gauge mediation, leading to Mini-Split
deflected anomaly and gauge mediation models. In this paper, we study LHC
constraints on these models and their prospects at LHC 14 and a 100 TeV
collider. Current constraints on their parameter space come from ATLAS and CMS
supersymmetry searches, the known mass of the Higgs boson, and the absence of a
color-breaking vacuum. Prospects at LHC 14 and a 100 TeV collider are obtained
from these same theoretical constraints in conjunction with background
estimates. As would be expected from renormalization group effects, a slightly
lighter third generation of squarks is assumed. Higgsinos have masses similar
to those of the scalars and are at the origin of the deflection.
| [
{
"created": "Tue, 10 Mar 2015 21:04:16 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2015 21:51:52 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Aug 2015 21:10:29 GMT",
"version": "v3"
}
] | 2015-09-30 | [
[
"Beauchesne",
"Hugues",
""
],
[
"Earl",
"Kevin",
""
],
[
"Gregoire",
"Thomas",
""
]
] | Stringent experimental constraints have raised the lower limit on the masses of squarks to TeV levels, while compatibility with the mass of the Higgs boson provides an upper limit. This two-sided bound has lead to the emergence of Mini-Split theories where gauginos are not far removed from the electroweak scale while scalars are somewhat heavier. This small hierarchy modifies the spectrum of standard anomaly and gauge mediation, leading to Mini-Split deflected anomaly and gauge mediation models. In this paper, we study LHC constraints on these models and their prospects at LHC 14 and a 100 TeV collider. Current constraints on their parameter space come from ATLAS and CMS supersymmetry searches, the known mass of the Higgs boson, and the absence of a color-breaking vacuum. Prospects at LHC 14 and a 100 TeV collider are obtained from these same theoretical constraints in conjunction with background estimates. As would be expected from renormalization group effects, a slightly lighter third generation of squarks is assumed. Higgsinos have masses similar to those of the scalars and are at the origin of the deflection. |
hep-ph/9712281 | Tomas Kafka | T. Kafka | Atmospheric neutrino interactions in Soudan-2 | 5 pages, 6 figures, latex, needs espcrc2.sty; Contributed to TAUP97,
5th Int. Workshop on Topics in Astroparticle and Underground Physics, Gran
Sasso, Sept. 1997 | Nucl.Phys.Proc.Suppl. 70 (1999) 340-344 | 10.1016/S0920-5632(98)00446-0 | TUHEP-97-09 | hep-ph | null | A new measurement of the atmospheric numu/nue ratio-of-ratios, 0.61 +- 0.15
+- 0.05, has been obtained using a 3.2-kty exposure of the Soudan-2 underground
detector. This measurement, based upon neutrino reactions in an iron tracking
calorimeter of honeycomb-lattice geometry, is in agreement with the anomalously
low value reported by the underground water detectors.
| [
{
"created": "Sat, 6 Dec 1997 00:45:55 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kafka",
"T.",
""
]
] | A new measurement of the atmospheric numu/nue ratio-of-ratios, 0.61 +- 0.15 +- 0.05, has been obtained using a 3.2-kty exposure of the Soudan-2 underground detector. This measurement, based upon neutrino reactions in an iron tracking calorimeter of honeycomb-lattice geometry, is in agreement with the anomalously low value reported by the underground water detectors. |
1703.03583 | Xing-Gang Wu | Sheng-Quan Wang, Xing-Gang Wu, Zong-Guo Si and Stanley J. Brodsky | A precise determination of the top-quark pole mass | 10 pages, 6 figures. Revised version to be published in Eur.Phys.J.C | Eur. Phys. J. C 78 (2018) 237 | 10.1140/epjc/s10052-018-5688-1 | SLAC-PUB-16934 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Principle of Maximum Conformality (PMC) provides a systematic way to
eliminate the renormalization scheme and renormalization scale uncertainties
for high-energy processes. We have observed that by applying PMC scale-setting,
one obtains comprehensive and self-consistent pQCD predictions for the
top-quark pair total cross-section and the top-quark pair forward-backward
asymmetry in agreement with the measurements at the Tevatron and LHC. As a step
forward, in the present paper, we determine the top-quark pole mass via a
detailed comparison of the top-quark pair cross-section with the measurements
at the Tevatron and LHC. The results for the top-quark pole mass are
$m_t=174.6^{+3.1}_{-3.2}$ GeV for the Tevatron with $\sqrt{S}=1.96$ TeV,
$m_t=173.7\pm1.5$ GeV and $174.2\pm1.7$ GeV for the LHC with $\sqrt{S} = 7$ TeV
and $8$ TeV, respectively. Those predictions agree with the average,
$173.34\pm0.76$ GeV, obtained from various collaborations via direct
measurements. The consistency of the pQCD predictions using the PMC with all of
the collider measurements at different energies provides an important
verification of QCD.
| [
{
"created": "Fri, 10 Mar 2017 09:02:31 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Mar 2018 11:38:38 GMT",
"version": "v2"
}
] | 2018-03-22 | [
[
"Wang",
"Sheng-Quan",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Si",
"Zong-Guo",
""
],
[
"Brodsky",
"Stanley J.",
""
]
] | The Principle of Maximum Conformality (PMC) provides a systematic way to eliminate the renormalization scheme and renormalization scale uncertainties for high-energy processes. We have observed that by applying PMC scale-setting, one obtains comprehensive and self-consistent pQCD predictions for the top-quark pair total cross-section and the top-quark pair forward-backward asymmetry in agreement with the measurements at the Tevatron and LHC. As a step forward, in the present paper, we determine the top-quark pole mass via a detailed comparison of the top-quark pair cross-section with the measurements at the Tevatron and LHC. The results for the top-quark pole mass are $m_t=174.6^{+3.1}_{-3.2}$ GeV for the Tevatron with $\sqrt{S}=1.96$ TeV, $m_t=173.7\pm1.5$ GeV and $174.2\pm1.7$ GeV for the LHC with $\sqrt{S} = 7$ TeV and $8$ TeV, respectively. Those predictions agree with the average, $173.34\pm0.76$ GeV, obtained from various collaborations via direct measurements. The consistency of the pQCD predictions using the PMC with all of the collider measurements at different energies provides an important verification of QCD. |
2109.08163 | Susan Gardner | Christopher M. Donohue, Susan Gardner, and Wolfgang Korsch | LC Circuits for the Direct Detection of Ultralight Dark Matter
Candidates | 6 pages, 2 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological mechanisms that yield ultralight dark matter are insensitive to
the intrinsic parity of a bosonic dark matter candidate, but that same quantity
plays a crucial role in a direct detection experiment. The modification of
electrodynamics in the presence of ultralight axion-like dark matter is
well-known and has been used to realize sensitive probes of such sub-eV
mass-scale dark matter, and analogous studies exist for hidden-photon dark
matter as well. Here we reframe the modification of electrodynamics for
ultralight dark matter of positive intrinsic parity, with a focus on the scalar
case. In particular, we show that resonant LC circuit searches for axions can
be modified to detect scalar dark matter particles by exploiting the large
electric fields developed for use in neutron EDM experiments. Our proposed
experimental set-up can improve upon previous sensitive searches for scalar
particles from "light shining through a wall" experiments to probe
scalar-photon couplings some three orders of magnitude smaller in the $1\times
10^{-11} - \,4\times 10^{-8}$ eV mass ($2\, {\rm kHz} - 10\,{ \rm MHz}$
frequency) range.
| [
{
"created": "Thu, 16 Sep 2021 18:00:02 GMT",
"version": "v1"
}
] | 2021-09-20 | [
[
"Donohue",
"Christopher M.",
""
],
[
"Gardner",
"Susan",
""
],
[
"Korsch",
"Wolfgang",
""
]
] | Cosmological mechanisms that yield ultralight dark matter are insensitive to the intrinsic parity of a bosonic dark matter candidate, but that same quantity plays a crucial role in a direct detection experiment. The modification of electrodynamics in the presence of ultralight axion-like dark matter is well-known and has been used to realize sensitive probes of such sub-eV mass-scale dark matter, and analogous studies exist for hidden-photon dark matter as well. Here we reframe the modification of electrodynamics for ultralight dark matter of positive intrinsic parity, with a focus on the scalar case. In particular, we show that resonant LC circuit searches for axions can be modified to detect scalar dark matter particles by exploiting the large electric fields developed for use in neutron EDM experiments. Our proposed experimental set-up can improve upon previous sensitive searches for scalar particles from "light shining through a wall" experiments to probe scalar-photon couplings some three orders of magnitude smaller in the $1\times 10^{-11} - \,4\times 10^{-8}$ eV mass ($2\, {\rm kHz} - 10\,{ \rm MHz}$ frequency) range. |
hep-ph/0703092 | Nicholas Harries | Sandhya Choubey, N. P. Harries, G.G. Ross | Turbulent Supernova Shock Waves and the Sterile Neutrino Signature in
Megaton Water Detectors | 28 pages, 11 figures | Phys.Rev.D76:073013,2007 | 10.1103/PhysRevD.76.073013 | null | hep-ph | null | The signatures of sterile neutrinos in the supernova neutrino signal in
megaton water Cerenkov detectors are studied. Time dependent modulation of the
neutrino signal emerging from the sharp changes in the oscillation probability
due to shock waves is shown to be a smoking gun for the existence of sterile
neutrinos. These modulations and indeed the entire neutrino oscillation signal
is found to be different for the case with just three active neutrinos and the
cases where there are additional sterile species mixed with the active
neutrinos. The effect of turbulence is taken into account and it is found that
the effect of the shock waves, while modifed, remain significant and
measurable. Supernova neutrino signals in water detectors can therefore give
unambiguous proof for the existence of sterile neutrinos, the sensitivity
extending beyond that for terrestial neutrino experiments. In addition the time
dependent modulations in the signal due to shock waves can be used to trace the
evolution of the shock wave inside the supernova.
| [
{
"created": "Thu, 8 Mar 2007 17:51:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Choubey",
"Sandhya",
""
],
[
"Harries",
"N. P.",
""
],
[
"Ross",
"G. G.",
""
]
] | The signatures of sterile neutrinos in the supernova neutrino signal in megaton water Cerenkov detectors are studied. Time dependent modulation of the neutrino signal emerging from the sharp changes in the oscillation probability due to shock waves is shown to be a smoking gun for the existence of sterile neutrinos. These modulations and indeed the entire neutrino oscillation signal is found to be different for the case with just three active neutrinos and the cases where there are additional sterile species mixed with the active neutrinos. The effect of turbulence is taken into account and it is found that the effect of the shock waves, while modifed, remain significant and measurable. Supernova neutrino signals in water detectors can therefore give unambiguous proof for the existence of sterile neutrinos, the sensitivity extending beyond that for terrestial neutrino experiments. In addition the time dependent modulations in the signal due to shock waves can be used to trace the evolution of the shock wave inside the supernova. |
1505.04192 | Yanou Cui | Zackaria Chacko, Yanou Cui, Sungwoo Hong, Takemichi Okui | A Hidden Dark Matter Sector, Dark Radiation, and the CMB | 15 pages, 5 figures. Version published in PRD | Phys. Rev. D 92, 055033 (2015) | 10.1103/PhysRevD.92.055033 | UMD-PP-014-018 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider theories where dark matter is composed of a thermal relic of weak
scale mass, whose couplings to the Standard Model (SM) are however too small to
give rise to the observed abundance. Instead, the abundance is set by
annihilation to light hidden sector states that carry no charges under the SM
gauge interactions. In such a scenario the constraints from direct and indirect
detection, and from collider searches for dark matter, can easily be satisfied.
The masses of such light hidden states can be protected by symmetry if they are
Nambu-Goldstone bosons, fermions, or gauge bosons. These states can then
contribute to the cosmic energy density as dark radiation, leading to
observable signals in the cosmic microwave background (CMB). Furthermore,
depending on whether or not the light hidden sector states self-interact, the
fraction of the total energy density that free-streams is either decreased or
increased, leading to characteristic effects on both the scalar and tensor
components of the CMB anisotropy that allows these two cases to be
distinguished. The magnitude of these signals depends on the number of light
degrees of freedom in the hidden sector, and on the temperature at which it
kinetically decouples from the SM. We consider a simple model that realizes
this scenario, based on a framework in which the SM and hidden sector are
initially in thermal equilibrium through the Higgs portal, and show that the
resulting signals are compatible with recent Planck results, while large enough
to be detected in upcoming experiments such as CMBPol and CMB Stage-IV.
Invisible decays of the Higgs into hidden sector states at colliders can offer
a complementary probe of this model.
| [
{
"created": "Fri, 15 May 2015 20:00:47 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2016 15:47:57 GMT",
"version": "v2"
}
] | 2016-01-18 | [
[
"Chacko",
"Zackaria",
""
],
[
"Cui",
"Yanou",
""
],
[
"Hong",
"Sungwoo",
""
],
[
"Okui",
"Takemichi",
""
]
] | We consider theories where dark matter is composed of a thermal relic of weak scale mass, whose couplings to the Standard Model (SM) are however too small to give rise to the observed abundance. Instead, the abundance is set by annihilation to light hidden sector states that carry no charges under the SM gauge interactions. In such a scenario the constraints from direct and indirect detection, and from collider searches for dark matter, can easily be satisfied. The masses of such light hidden states can be protected by symmetry if they are Nambu-Goldstone bosons, fermions, or gauge bosons. These states can then contribute to the cosmic energy density as dark radiation, leading to observable signals in the cosmic microwave background (CMB). Furthermore, depending on whether or not the light hidden sector states self-interact, the fraction of the total energy density that free-streams is either decreased or increased, leading to characteristic effects on both the scalar and tensor components of the CMB anisotropy that allows these two cases to be distinguished. The magnitude of these signals depends on the number of light degrees of freedom in the hidden sector, and on the temperature at which it kinetically decouples from the SM. We consider a simple model that realizes this scenario, based on a framework in which the SM and hidden sector are initially in thermal equilibrium through the Higgs portal, and show that the resulting signals are compatible with recent Planck results, while large enough to be detected in upcoming experiments such as CMBPol and CMB Stage-IV. Invisible decays of the Higgs into hidden sector states at colliders can offer a complementary probe of this model. |
1904.11336 | Jin Pu | Jin Pu, Guo-Ping Li, Qing-Quan Jiang, Xiao-Tao Zu | Constraining the deformed dispersion relation with the hydrogen atom
1S-2S transition | 16 pages, to be published in Chinese Physics C | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we use the latest results of the ultra-high accuracy 1S-2S
transition experiments in hydrogen atom to constrain the forms of the deformed
dispersion relation in the nonrelativistic limit. For the leading correction of
the nonrelativistic limit, the experiment sets a limit at an order of magnitude
for the desired Planck-scale level, thereby providing another example of the
Planck-scale sensitivity in the study of the dispersion relation in controlled
laboratory experiments. And for the next-to-leading term, bound has two orders
of magnitude away from the Planck scale, but it still amounts to the best
limit, in contrast to previously obtained bound in the nonrelativistic limit
from the cold-atom-recoil experiments.
| [
{
"created": "Wed, 24 Apr 2019 15:25:44 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2019 06:54:39 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Oct 2019 09:40:26 GMT",
"version": "v3"
}
] | 2019-10-24 | [
[
"Pu",
"Jin",
""
],
[
"Li",
"Guo-Ping",
""
],
[
"Jiang",
"Qing-Quan",
""
],
[
"Zu",
"Xiao-Tao",
""
]
] | In this paper, we use the latest results of the ultra-high accuracy 1S-2S transition experiments in hydrogen atom to constrain the forms of the deformed dispersion relation in the nonrelativistic limit. For the leading correction of the nonrelativistic limit, the experiment sets a limit at an order of magnitude for the desired Planck-scale level, thereby providing another example of the Planck-scale sensitivity in the study of the dispersion relation in controlled laboratory experiments. And for the next-to-leading term, bound has two orders of magnitude away from the Planck scale, but it still amounts to the best limit, in contrast to previously obtained bound in the nonrelativistic limit from the cold-atom-recoil experiments. |
1109.3361 | Sheldon Stone | Sheldon Stone | Heavy Flavor Physics | To appear in Proceedings of the DPF-2011 Conference, Providence, RI,
August 8-13, 2011, 16 pages, 26 figures; version 2 fixed some typographical
errors | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main purpose of Heavy Flavor experiments is to discover physics beyond
the Standard Model, or characterize it, should it be found elsewhere. Thus,
current limits on New Physics (NP) are reviewed. New results are presented,
some involving processes that could show NP even with current data. Specific
topics include the CKM element |Vub|, the forward-backward asymmetry in B -> K*
mu+ mu-, b-hadron fractions at the LHC, B(Bs -> mu+ mu-), first observations of
several Bs and Bc decay modes, the X(4140), new b-baryons and their decays,
searches for Majorana neutrinos, and Lepton Flavor Violation.
| [
{
"created": "Thu, 15 Sep 2011 14:26:57 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2011 13:10:43 GMT",
"version": "v2"
}
] | 2011-09-23 | [
[
"Stone",
"Sheldon",
""
]
] | The main purpose of Heavy Flavor experiments is to discover physics beyond the Standard Model, or characterize it, should it be found elsewhere. Thus, current limits on New Physics (NP) are reviewed. New results are presented, some involving processes that could show NP even with current data. Specific topics include the CKM element |Vub|, the forward-backward asymmetry in B -> K* mu+ mu-, b-hadron fractions at the LHC, B(Bs -> mu+ mu-), first observations of several Bs and Bc decay modes, the X(4140), new b-baryons and their decays, searches for Majorana neutrinos, and Lepton Flavor Violation. |
1707.02306 | Daniel Egana-Ugrinovic | Daniel Egana-Ugrinovic | The minimal fermionic model of electroweak baryogenesis | 30 + 10 pages, 6 figures | null | 10.1007/JHEP12(2017)064 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the minimal model of electroweak baryogenesis induced by fermions.
The model consists of an extension of the Standard Model with one electroweak
singlet fermion and one pair of vector like doublet fermions with
renormalizable couplings to the Higgs. A strong first order phase transition is
radiatively induced by the singlet-doublet fermions, while the origin of the
baryon asymmetry is due to asymmetric reflection of the same set of fermions on
the expanding electroweak bubble wall. The singlet-doublet fermions are
stabilized at the electroweak scale by chiral symmetries and the Higgs
potential is stabilized by threshold corrections coming from a multi-TeV
ultraviolet completion which does not play any significant role in the phase
transition. We work in terms of background symmetry invariants and perform an
analytic semiclassical calculation of the baryon asymmetry, showing that the
model may effectively generate the observed baryon asymmetry for percent level
values of the unique invariant CP violating phase of the singlet-doublet
sector. We include a detailed study of electron electric dipole moment and
electroweak precision limits, and for one typical benchmark scenario we also
recast existing collider constraints, showing that the model is consistent with
all current experimental data. We point out that fermion induced electroweak
baryogenesis has irreducible phenomenology at the $13 \, \textrm{TeV}$ LHC
since the new fermions must be at the electroweak scale, have electroweak
quantum numbers and couple strongly with the Higgs. The most promising searches
involve topologies with multiple leptons and missing energy in the final state.
| [
{
"created": "Fri, 7 Jul 2017 18:00:03 GMT",
"version": "v1"
}
] | 2017-12-20 | [
[
"Egana-Ugrinovic",
"Daniel",
""
]
] | We present the minimal model of electroweak baryogenesis induced by fermions. The model consists of an extension of the Standard Model with one electroweak singlet fermion and one pair of vector like doublet fermions with renormalizable couplings to the Higgs. A strong first order phase transition is radiatively induced by the singlet-doublet fermions, while the origin of the baryon asymmetry is due to asymmetric reflection of the same set of fermions on the expanding electroweak bubble wall. The singlet-doublet fermions are stabilized at the electroweak scale by chiral symmetries and the Higgs potential is stabilized by threshold corrections coming from a multi-TeV ultraviolet completion which does not play any significant role in the phase transition. We work in terms of background symmetry invariants and perform an analytic semiclassical calculation of the baryon asymmetry, showing that the model may effectively generate the observed baryon asymmetry for percent level values of the unique invariant CP violating phase of the singlet-doublet sector. We include a detailed study of electron electric dipole moment and electroweak precision limits, and for one typical benchmark scenario we also recast existing collider constraints, showing that the model is consistent with all current experimental data. We point out that fermion induced electroweak baryogenesis has irreducible phenomenology at the $13 \, \textrm{TeV}$ LHC since the new fermions must be at the electroweak scale, have electroweak quantum numbers and couple strongly with the Higgs. The most promising searches involve topologies with multiple leptons and missing energy in the final state. |
1003.5499 | Keijo Kajantie | J. Alanen, K. Kajantie, K. Tuominen | Thermodynamics of Quasi Conformal Theories From Gauge/Gravity Duality | 17 pages, 13 figures. | Phys.Rev.D82:055024,2010 | 10.1103/PhysRevD.82.055024 | CP3-Origins-2010-14 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use gauge/gravity duality to study the thermodynamics of a generic almost
conformal theory, specified by its beta function. Three different phases are
identified, a high temperature phase of massless partons, an intermediate
quasi-conformal phase and a low temperature confining phase. The limit of a
theory with infrared fixed point, in which the coupling does not run to
infinity, is also studied. The transitions between the phases are of first
order or continuous, depending on the parameters of the beta function. The
results presented follow from gauge/gravity duality; no specific boundary
theory is assumed, only its beta function.
| [
{
"created": "Mon, 29 Mar 2010 11:05:08 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Alanen",
"J.",
""
],
[
"Kajantie",
"K.",
""
],
[
"Tuominen",
"K.",
""
]
] | We use gauge/gravity duality to study the thermodynamics of a generic almost conformal theory, specified by its beta function. Three different phases are identified, a high temperature phase of massless partons, an intermediate quasi-conformal phase and a low temperature confining phase. The limit of a theory with infrared fixed point, in which the coupling does not run to infinity, is also studied. The transitions between the phases are of first order or continuous, depending on the parameters of the beta function. The results presented follow from gauge/gravity duality; no specific boundary theory is assumed, only its beta function. |
hep-ph/0407232 | Docteur Peter Wolf | Peter Wolf, Michael E. Tobar, Sebastien Bize, Andre Clairon, Andre N.
Luiten, Giorgio Santarelli | Improved Test of Lorentz Invariance in Electrodynamics | accepted for publication in Phys. Rev. D, rapid communications | Phys.Rev. D70 (2004) 051902 | 10.1103/PhysRevD.70.051902 | null | hep-ph gr-qc | null | We report new results of a test of Lorentz invariance based on the comparison
of a cryogenic sapphire microwave resonator and a hydrogen maser. The
experimental results are shown together with an extensive analysis of
systematic effects. Previously, this experiment has set the most stringent
constraint on Kennedy-Thorndike type violations of Lorentz invariance. In this
work we present new data and interpret our results in the general Lorentz
violating extension of the standard model of particle physics (SME). Within the
photon sector of the SME, our experiment is sensitive to seven SME parameters.
We marginally improve present limits on four of these, and by a factor 7 to 10
on the other three.
| [
{
"created": "Tue, 20 Jul 2004 18:22:04 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2004 13:42:08 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Wolf",
"Peter",
""
],
[
"Tobar",
"Michael E.",
""
],
[
"Bize",
"Sebastien",
""
],
[
"Clairon",
"Andre",
""
],
[
"Luiten",
"Andre N.",
""
],
[
"Santarelli",
"Giorgio",
""
]
] | We report new results of a test of Lorentz invariance based on the comparison of a cryogenic sapphire microwave resonator and a hydrogen maser. The experimental results are shown together with an extensive analysis of systematic effects. Previously, this experiment has set the most stringent constraint on Kennedy-Thorndike type violations of Lorentz invariance. In this work we present new data and interpret our results in the general Lorentz violating extension of the standard model of particle physics (SME). Within the photon sector of the SME, our experiment is sensitive to seven SME parameters. We marginally improve present limits on four of these, and by a factor 7 to 10 on the other three. |
1005.3309 | Marja Hanussek | H. K. Dreiner, S. Grab, M. Hanussek | Bounds on R-parity Violating Couplings at the Grand Unification Scale
from Neutrino Masses | 24 pages, 14 figures | Phys.Rev.D82:055027,2010 | 10.1103/PhysRevD.82.055027 | BONN-TH-2010-02, SCIPP 10/02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the embedding of the supersymmetric Standard Model with broken
R-parity in the minimal supergravity (mSUGRA) model. We restrict ourselves to
the case of broken lepton number, the B3 mSUGRA model. We first study in detail
how the tree-level neutrino mass depends on the mSUGRA parameters. We find in
particular a strong dependence on the trilinear supersymmetry breaking
A-parameter, even in the vicinity of the mSUGRA SPS1a point. We then
reinvestigate the bounds on the trilinear R-parity violating couplings at the
unification scale from the low-energy neutrino masses including dominant
one-loop contributions. These bounds were previously shown to be very strict,
as low as O(10^{-6}) for SPS1a. We show that these bounds are significantly
weakened when considering the full mSUGRA parameter space. In particular the
ratio between the tree-level and 1-loop neutrino masses is reduced such that it
may agree with the observed neutrino mass hierarchy. We discuss in detail how
and in which parameter regions this effect arises.
| [
{
"created": "Tue, 18 May 2010 20:01:13 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Dreiner",
"H. K.",
""
],
[
"Grab",
"S.",
""
],
[
"Hanussek",
"M.",
""
]
] | We consider the embedding of the supersymmetric Standard Model with broken R-parity in the minimal supergravity (mSUGRA) model. We restrict ourselves to the case of broken lepton number, the B3 mSUGRA model. We first study in detail how the tree-level neutrino mass depends on the mSUGRA parameters. We find in particular a strong dependence on the trilinear supersymmetry breaking A-parameter, even in the vicinity of the mSUGRA SPS1a point. We then reinvestigate the bounds on the trilinear R-parity violating couplings at the unification scale from the low-energy neutrino masses including dominant one-loop contributions. These bounds were previously shown to be very strict, as low as O(10^{-6}) for SPS1a. We show that these bounds are significantly weakened when considering the full mSUGRA parameter space. In particular the ratio between the tree-level and 1-loop neutrino masses is reduced such that it may agree with the observed neutrino mass hierarchy. We discuss in detail how and in which parameter regions this effect arises. |
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