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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2312.13349 | Pablo Quilez | Benjam\'in Grinstein, Xiaochuan Lu, Luca Merlo and Pablo Qu\'ilez | Hilbert series for covariants and their applications to Minimal Flavor
Violation | 96 pages, 16 tables | null | null | IFT-UAM-CSIC-23-67 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elaborate how to apply the Hilbert series method to enumerating group
covariants, which transform under any given representation, including but going
beyond group invariants. Mathematically, group covariants form a module over
the ring of the invariants. The number of independent covariants is given by
the rank of the module, which can be computed by taking a ratio of two Hilbert
series. In many cases, the rank equals the dimension of the group covariant
representation. When this happens, we say that there is a \textit{rank
saturation}. We apply this technology to revisit the hypothesis of Minimal
Flavor Violation in constructing Effective Field Theories beyond the Standard
Model. We find that rank saturation is guaranteed in this case, leading to the
important consequence that the MFV symmetry principle does not impose any
restriction on the EFT, \textit{i.e.} MFV SMEFT = SMEFT, in the absence of
additional assumptions.
| [
{
"created": "Wed, 20 Dec 2023 19:00:01 GMT",
"version": "v1"
}
] | 2023-12-22 | [
[
"Grinstein",
"Benjamín",
""
],
[
"Lu",
"Xiaochuan",
""
],
[
"Merlo",
"Luca",
""
],
[
"Quílez",
"Pablo",
""
]
] | We elaborate how to apply the Hilbert series method to enumerating group covariants, which transform under any given representation, including but going beyond group invariants. Mathematically, group covariants form a module over the ring of the invariants. The number of independent covariants is given by the rank of the module, which can be computed by taking a ratio of two Hilbert series. In many cases, the rank equals the dimension of the group covariant representation. When this happens, we say that there is a \textit{rank saturation}. We apply this technology to revisit the hypothesis of Minimal Flavor Violation in constructing Effective Field Theories beyond the Standard Model. We find that rank saturation is guaranteed in this case, leading to the important consequence that the MFV symmetry principle does not impose any restriction on the EFT, \textit{i.e.} MFV SMEFT = SMEFT, in the absence of additional assumptions. |
1804.10468 | Yusuke Shimizu | Sin Kyu Kang, Yusuke Shimizu, Kenta Takagi, Shunya Takahashi,
Morimitsu Tanimoto | Revisiting $A_4$ model for leptons in light of NuFIT 3.2 | 21 pages, 14 figures | Prog Theor Exp Phys (2018) | 10.1093/ptep/pty080 | HUPD1801 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the $A_4$ model for leptons in light of new result of NuFIT 3.2.
We introduce a new flavon $\eta$ transforming as $A_4$ singlet $1'$ or $1"$
which couples to both charged leptons and neutrinos in next-leading order
operators. The model consists of the five parameters: the lightest neutrino
mass $m_1$, the vacuum expectation value of $\eta$ and three CP violating
phases after inputting the experimental values of $\Delta m_{\rm atm}^2$ and
$\Delta m_{\rm sol}^2$. The model with the $1"$ singlet flavon gives the
prediction of $\sin^2 \theta_{12}$ around the best fit of NuFIT 3.2 while
keeping near the maximal mixing of $\theta_{23}$. Inputting the experimental
mixing angles with the $1\,\sigma$ error-bar, the Dirac CP violating phase is
clearly predicted to be $|\delta_\text{CP}|=50^\circ- 120^\circ$, which will be
tested by the precise observed value in the future. In order to get the best
fit value $\sin^2\theta_{23}=0.538$, the sum of three neutrino masses is
predicted to be larger than $90\,$meV. The cosmological observation for the sum
of neutrino masses will also provide a crucial test of our predictions. It is
remarked that the model is consistent with the experimental data only for the
normal hierarchy of neutrino masses.
| [
{
"created": "Fri, 27 Apr 2018 12:34:30 GMT",
"version": "v1"
}
] | 2019-12-06 | [
[
"Kang",
"Sin Kyu",
""
],
[
"Shimizu",
"Yusuke",
""
],
[
"Takagi",
"Kenta",
""
],
[
"Takahashi",
"Shunya",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We revisit the $A_4$ model for leptons in light of new result of NuFIT 3.2. We introduce a new flavon $\eta$ transforming as $A_4$ singlet $1'$ or $1"$ which couples to both charged leptons and neutrinos in next-leading order operators. The model consists of the five parameters: the lightest neutrino mass $m_1$, the vacuum expectation value of $\eta$ and three CP violating phases after inputting the experimental values of $\Delta m_{\rm atm}^2$ and $\Delta m_{\rm sol}^2$. The model with the $1"$ singlet flavon gives the prediction of $\sin^2 \theta_{12}$ around the best fit of NuFIT 3.2 while keeping near the maximal mixing of $\theta_{23}$. Inputting the experimental mixing angles with the $1\,\sigma$ error-bar, the Dirac CP violating phase is clearly predicted to be $|\delta_\text{CP}|=50^\circ- 120^\circ$, which will be tested by the precise observed value in the future. In order to get the best fit value $\sin^2\theta_{23}=0.538$, the sum of three neutrino masses is predicted to be larger than $90\,$meV. The cosmological observation for the sum of neutrino masses will also provide a crucial test of our predictions. It is remarked that the model is consistent with the experimental data only for the normal hierarchy of neutrino masses. |
hep-ph/0212010 | Howard E. Haber | Howard E. Haber | Decoupling and the radiatively-corrected MSSM Higgs sector | 6 pages, 1 figure, LaTeX with npb.sty, talk at RADCOR-2002 - Loops
and Legs 2002, Kloster Banz, Germany, 8-13 September 2002 | Nucl.Phys.Proc.Suppl. 116 (2003) 291-295 | 10.1016/S0920-5632(03)80186-X | SCIPP-02/27 | hep-ph | null | In the decoupling limit of a non-minimal Higgs sector, the lightest CP-even
Higgs boson (h) is indistinguishable from the Standard Model (SM) Higgs boson.
In the two-Higgs-doublet sector of the MSSM, the approach to the decoupling
limit (for m_A>>m_Z) persists, even in the presence of potentially large
(tan(beta)-enhanced) radiative corrections to the hbb coupling. Radiative
corrections can also generate an accidental cancellation between tree-level and
one-loop terms, resulting in a SM-like Higgs boson for moderate m_A outside the
decoupling regime.
| [
{
"created": "Sun, 1 Dec 2002 10:26:01 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Haber",
"Howard E.",
""
]
] | In the decoupling limit of a non-minimal Higgs sector, the lightest CP-even Higgs boson (h) is indistinguishable from the Standard Model (SM) Higgs boson. In the two-Higgs-doublet sector of the MSSM, the approach to the decoupling limit (for m_A>>m_Z) persists, even in the presence of potentially large (tan(beta)-enhanced) radiative corrections to the hbb coupling. Radiative corrections can also generate an accidental cancellation between tree-level and one-loop terms, resulting in a SM-like Higgs boson for moderate m_A outside the decoupling regime. |
2010.06458 | Bindu Anubha Bambah | Abhishek Kumar Jha, Akshay Chatla and Bindu A. Bambah | Quantum simulation of oscillating neutrinos | 8 pages, 6 figures, Prepared for the proceedings of The 5th
International Conference on Particle Physics and Astrophysics (ICPPA-2020),
Moscow, Russia, 5th-9th October,2020. New version has new references in
introduction | null | null | null | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two and three flavor oscillating neutrinos are shown to exhibit the
properties bipartite and tripartite quantum entanglement. The two and three
flavor neutrinos are mapped to qubit states used in quantum information theory.
Such quantum bits of the neutrino state can be encoded on a IBMQ computer using
quantum computing as a tool. We show the implementation of entanglement in the
two neutrino system on the IBM quantum processor.
| [
{
"created": "Tue, 13 Oct 2020 15:12:31 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Oct 2020 07:56:20 GMT",
"version": "v2"
}
] | 2020-10-27 | [
[
"Jha",
"Abhishek Kumar",
""
],
[
"Chatla",
"Akshay",
""
],
[
"Bambah",
"Bindu A.",
""
]
] | Two and three flavor oscillating neutrinos are shown to exhibit the properties bipartite and tripartite quantum entanglement. The two and three flavor neutrinos are mapped to qubit states used in quantum information theory. Such quantum bits of the neutrino state can be encoded on a IBMQ computer using quantum computing as a tool. We show the implementation of entanglement in the two neutrino system on the IBM quantum processor. |
2012.07761 | Alexander Parkhomenko | Ahmed Ali, Luciano Maiani, Alexander Parkhomenko, Wei Wang | Tetraquark Interpretation and Production Mechanism of the Belle $Y_b
(10750)$-Resonance | 6 pages, 1 figure. Contribution to the Proceedings of the 40th
ICHEP2020 Conference, Prague, Czech Republic (Virtual Conference) | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Recently, the Belle Collaboration has updated the analysis of the cross
sections for the processes $e^+ e^- \to \Upsilon(nS)\, \pi^+ \pi^-$ ($n = 1,\,
2,\, 3$) in the $e^+ e^-$ center-of-mass energy range from 10.52 to 11.02~GeV.
A new structure, called $Y_b (10750)$, with the mass $M (Y_b) = (10752.7 \pm
5.9^{+0.7}_{-1.1})$~MeV and the Breit-Wigner width $\Gamma (Y_b) = (35.5^{+17.6
+3.9}_{-11.3 -3.3})$~MeV was observed. We interpret $Y_b (10750)$ as a compact
$J^{PC} = 1^{--}$ state with a dominant tetraquark component. The mass
eigenstate $Y_b (10750)$ is treated as a linear combination of the
diquark-antidiquark and $b \bar b$ components due to the mixing via gluonic
exchanges shown recently to arise in the limit of large number of quark colors.
The mixing angle between $Y_b$ and $\Upsilon(5S)$ can be estimated from the
electronic width, recently determined to be $\Gamma_{ee} (Y_b) = (13.7 \pm
1.8)$~eV. The mixing provides a plausible mechanism for $Y_b (10750)$
production in high energy collisions from its $b \bar b$ component and we work
out the Drell-Yan and prompt production cross sections for $p p \to Y_b (10750)
\to \Upsilon (nS)\, \pi^+ \pi^-$ at the LHC. The resonant part of the dipion
invariant mass spectrum in $Y_b (10750) \to \Upsilon (1S)\, \pi^+ \pi^-$ and
the corresponding angular distribution of $\pi^+$-meson in the dipion rest
frame are presented.
| [
{
"created": "Mon, 14 Dec 2020 17:58:28 GMT",
"version": "v1"
}
] | 2020-12-15 | [
[
"Ali",
"Ahmed",
""
],
[
"Maiani",
"Luciano",
""
],
[
"Parkhomenko",
"Alexander",
""
],
[
"Wang",
"Wei",
""
]
] | Recently, the Belle Collaboration has updated the analysis of the cross sections for the processes $e^+ e^- \to \Upsilon(nS)\, \pi^+ \pi^-$ ($n = 1,\, 2,\, 3$) in the $e^+ e^-$ center-of-mass energy range from 10.52 to 11.02~GeV. A new structure, called $Y_b (10750)$, with the mass $M (Y_b) = (10752.7 \pm 5.9^{+0.7}_{-1.1})$~MeV and the Breit-Wigner width $\Gamma (Y_b) = (35.5^{+17.6 +3.9}_{-11.3 -3.3})$~MeV was observed. We interpret $Y_b (10750)$ as a compact $J^{PC} = 1^{--}$ state with a dominant tetraquark component. The mass eigenstate $Y_b (10750)$ is treated as a linear combination of the diquark-antidiquark and $b \bar b$ components due to the mixing via gluonic exchanges shown recently to arise in the limit of large number of quark colors. The mixing angle between $Y_b$ and $\Upsilon(5S)$ can be estimated from the electronic width, recently determined to be $\Gamma_{ee} (Y_b) = (13.7 \pm 1.8)$~eV. The mixing provides a plausible mechanism for $Y_b (10750)$ production in high energy collisions from its $b \bar b$ component and we work out the Drell-Yan and prompt production cross sections for $p p \to Y_b (10750) \to \Upsilon (nS)\, \pi^+ \pi^-$ at the LHC. The resonant part of the dipion invariant mass spectrum in $Y_b (10750) \to \Upsilon (1S)\, \pi^+ \pi^-$ and the corresponding angular distribution of $\pi^+$-meson in the dipion rest frame are presented. |
2307.07476 | Alessandro Granelli | Alessandro Granelli, Silvia Pascoli and Serguey T. Petcov | Low-Scale Leptogenesis with Low-Energy Dirac CP-Violation | 7 pages, 2 figures; matches version published in PRD | Phys. Rev. D 108 (2023) L101302 | 10.1103/PhysRevD.108.L101302 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the freeze-in scenario of leptogenesis via oscillations within the
type-I seesaw model with two quasi-degenerate heavy Majorana neutrinos
$N_{1,\,2}$ having masses $M_2 > M_1 \sim (0.1-100)\,\text{GeV}$,
$(M_2-M_1)/M_1 \ll 1$, focusing on the role of the CP-violation provided by the
Dirac phase $\delta$ of the Pontecorvo-Maki-Nakagawa-Sakata lepton mixing
matrix. We find that viable leptogenesis can be due solely to CP-violating
values of $\delta$ and that the $N_{1,\,2}$ total mixing squared
$\Theta^2=\sum_\alpha\Theta^2_\alpha$ needed is within the reach of future
experiments, $\Theta_\alpha$ parameterising the coupling to the charged lepton
$\alpha=e,\,\mu,\,\tau$. Furthermore, the required parameter space differs from
that associated with additional Casas-Ibarra sources of CP-violation. Future
determination of $\delta$, $\Theta^2$ and/or the ratios
$\Theta_\tau^2:\Theta^2_\mu:\Theta^2_e$ would provide a critical test of the
considered scenario.
| [
{
"created": "Fri, 14 Jul 2023 16:56:06 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2023 17:45:46 GMT",
"version": "v2"
}
] | 2023-11-09 | [
[
"Granelli",
"Alessandro",
""
],
[
"Pascoli",
"Silvia",
""
],
[
"Petcov",
"Serguey T.",
""
]
] | We study the freeze-in scenario of leptogenesis via oscillations within the type-I seesaw model with two quasi-degenerate heavy Majorana neutrinos $N_{1,\,2}$ having masses $M_2 > M_1 \sim (0.1-100)\,\text{GeV}$, $(M_2-M_1)/M_1 \ll 1$, focusing on the role of the CP-violation provided by the Dirac phase $\delta$ of the Pontecorvo-Maki-Nakagawa-Sakata lepton mixing matrix. We find that viable leptogenesis can be due solely to CP-violating values of $\delta$ and that the $N_{1,\,2}$ total mixing squared $\Theta^2=\sum_\alpha\Theta^2_\alpha$ needed is within the reach of future experiments, $\Theta_\alpha$ parameterising the coupling to the charged lepton $\alpha=e,\,\mu,\,\tau$. Furthermore, the required parameter space differs from that associated with additional Casas-Ibarra sources of CP-violation. Future determination of $\delta$, $\Theta^2$ and/or the ratios $\Theta_\tau^2:\Theta^2_\mu:\Theta^2_e$ would provide a critical test of the considered scenario. |
hep-ph/9303233 | null | Peter N. Maher, Loyal Durand, and Kurt Riesselmann | Two-loop renormalization constants and high energy $2\rightarrow 2$
scattering amplitudes in the Higgs sector of the standard model | 47 pages, 7 figures available by request to LD, RevTEX 3.0,
MAD/TH/93-1 | Phys.Rev.D48:1061,1993; Erratum-ibid.D52:553,1995;
Phys.Rev.D52:553,1995 | 10.1103/PhysRevD.48.1061 10.1103/PhysRevD.52.553 | null | hep-ph | null | We calculate the complete matrix of two-body scattering amplitudes for the
scattering of longitudinally polarized gauge bosons $W_L^\pm$, $Z_L$ and Higgs
bosons to two loops in the high-energy, heavy-Higgs limit $\sqrt{s}\gg M_H\gg
M_W$. Use of the Goldstone boson equivalence theorem reduces the problem to one
involving only the scalar fields $w^\pm$, $z$ (the Goldstone bosons of the
original theory) and the Higgs boson. Renormalization of the scattering
amplitudes requires the calculation of the self-energy functions $\Pi
_i^0(M_i^2)$, the renormalization constants $Z_i$, and the bare quartic Higgs
coupling $\lambda _0$ to two loops. The results will be useful in other
calculations. To facilitate the calculations, we introduce a powerful new
technique for evaluating integrals over Feynman parameters in dimensional
regularization which is based on a Barnes' type representation of the binomial
expansion. We also collect some useful integrals which extend the tables given
by Devoto and Duke.
| [
{
"created": "Tue, 9 Mar 1993 14:38:00 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Maher",
"Peter N.",
""
],
[
"Durand",
"Loyal",
""
],
[
"Riesselmann",
"Kurt",
""
]
] | We calculate the complete matrix of two-body scattering amplitudes for the scattering of longitudinally polarized gauge bosons $W_L^\pm$, $Z_L$ and Higgs bosons to two loops in the high-energy, heavy-Higgs limit $\sqrt{s}\gg M_H\gg M_W$. Use of the Goldstone boson equivalence theorem reduces the problem to one involving only the scalar fields $w^\pm$, $z$ (the Goldstone bosons of the original theory) and the Higgs boson. Renormalization of the scattering amplitudes requires the calculation of the self-energy functions $\Pi _i^0(M_i^2)$, the renormalization constants $Z_i$, and the bare quartic Higgs coupling $\lambda _0$ to two loops. The results will be useful in other calculations. To facilitate the calculations, we introduce a powerful new technique for evaluating integrals over Feynman parameters in dimensional regularization which is based on a Barnes' type representation of the binomial expansion. We also collect some useful integrals which extend the tables given by Devoto and Duke. |
0904.3360 | Hiroshi Nunokawa | A. M. Gago, H. Minakata, H. Nunokawa, S. Uchinami and R. Zukanovich
Funchal | Resolving CP Violation by Standard and Nonstandard Interactions and
Parameter Degeneracy in Neutrino Oscillations | 43 pages, 28 figures, version accepted for publication in JHEP | JHEP 1001:049,2010 | 10.1007/JHEP01(2010)049 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In neutrino oscillation with non-standard interactions (NSI) the system is
enriched with CP violation caused by phases due to NSI in addition to the
standard lepton Kobayashi-Maskawa phase \delta. In this paper we show that it
is possible to disentangle the two CP violating effects by measurement of muon
neutrino appearance by a near-far two detector setting in neutrino factory
experiments. Prior to the quantitative analysis we investigate in detail the
various features of the neutrino oscillations with NSI, but under the
assumption that only one of the NSI elements, \epsilon_{e \mu} or \epsilon_{e
\tau}, is present. They include synergy between the near and the far detectors,
the characteristic differences between the \epsilon_{e \mu} and
\epsilon_{e\tau} systems, and in particular, the parameter degeneracy. Finally,
we use a concrete setting with the muon energy of 50 GeV and magnetized iron
detectors at two baselines, one at L=3000 km and the other at L=7000 km, each
having a fiducial mass of 50 kton to study the discovery potential of NSI and
its CP violation effects. We demonstrate, by assuming 4 \times 10^{21} useful
muon decays for both polarities, that one can identify non-standard CP
violation down to | epsilon_{e \mu} | \simeq \text{a few} \times 10^{-3}, and |
\epsilon_{e \tau} | \simeq 10^{-2} at 3\sigma CL for \theta_{13} down to \sin^2
2\theta_{13} = 10^{-4} in most of the region of \delta. The impact of the
existence of NSI on the measurement of \delta and the mass hierarchy is also
worked out.
| [
{
"created": "Tue, 21 Apr 2009 22:53:31 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2009 21:29:29 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Dec 2009 20:12:09 GMT",
"version": "v3"
}
] | 2010-01-22 | [
[
"Gago",
"A. M.",
""
],
[
"Minakata",
"H.",
""
],
[
"Nunokawa",
"H.",
""
],
[
"Uchinami",
"S.",
""
],
[
"Funchal",
"R. Zukanovich",
""
]
] | In neutrino oscillation with non-standard interactions (NSI) the system is enriched with CP violation caused by phases due to NSI in addition to the standard lepton Kobayashi-Maskawa phase \delta. In this paper we show that it is possible to disentangle the two CP violating effects by measurement of muon neutrino appearance by a near-far two detector setting in neutrino factory experiments. Prior to the quantitative analysis we investigate in detail the various features of the neutrino oscillations with NSI, but under the assumption that only one of the NSI elements, \epsilon_{e \mu} or \epsilon_{e \tau}, is present. They include synergy between the near and the far detectors, the characteristic differences between the \epsilon_{e \mu} and \epsilon_{e\tau} systems, and in particular, the parameter degeneracy. Finally, we use a concrete setting with the muon energy of 50 GeV and magnetized iron detectors at two baselines, one at L=3000 km and the other at L=7000 km, each having a fiducial mass of 50 kton to study the discovery potential of NSI and its CP violation effects. We demonstrate, by assuming 4 \times 10^{21} useful muon decays for both polarities, that one can identify non-standard CP violation down to | epsilon_{e \mu} | \simeq \text{a few} \times 10^{-3}, and | \epsilon_{e \tau} | \simeq 10^{-2} at 3\sigma CL for \theta_{13} down to \sin^2 2\theta_{13} = 10^{-4} in most of the region of \delta. The impact of the existence of NSI on the measurement of \delta and the mass hierarchy is also worked out. |
hep-ph/0210085 | Matthias Neubert | Martin Beneke (Aachen) and Matthias Neubert (Cornell) | Flavor-Singlet B-Decay Amplitudes in QCD Factorization | 25 pages, 5 figures | Nucl.Phys.B651:225-248,2003 | 10.1016/S0550-3213(02)01091-X | CLNS-02/1802, PITHA-02/14 | hep-ph | null | Exclusive hadronic B-meson decays into two-body final states consisting of a
light pseudoscalar or vector meson along with an eta or eta' meson are of great
phenomenological interest. Their theoretical analysis involves decay mechanisms
that are unique to flavor-singlet states, such as their coupling to gluons or
their ``intrinsic charm'' content. These issues are studied systematically in
the context of QCD factorization and the heavy-quark expansion. Theory can
account for the experimental data on the B->K^{(*)} eta^{(')} branching
fractions, albeit within large uncertainties.
| [
{
"created": "Fri, 4 Oct 2002 20:35:41 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Beneke",
"Martin",
"",
"Aachen"
],
[
"Neubert",
"Matthias",
"",
"Cornell"
]
] | Exclusive hadronic B-meson decays into two-body final states consisting of a light pseudoscalar or vector meson along with an eta or eta' meson are of great phenomenological interest. Their theoretical analysis involves decay mechanisms that are unique to flavor-singlet states, such as their coupling to gluons or their ``intrinsic charm'' content. These issues are studied systematically in the context of QCD factorization and the heavy-quark expansion. Theory can account for the experimental data on the B->K^{(*)} eta^{(')} branching fractions, albeit within large uncertainties. |
hep-ph/9407227 | Asher Gotsman | E. Gotsman, E.M. Levin and U. Maor | The Role of Screening Corrections in High Energy Photoproduction | 12 pages (Replacement due to PostScript file problem in previous
posting) | Phys.Lett. B347 (1995) 424-430 | 10.1016/0370-2693(95)00075-V | null | hep-ph | null | The role of screening corrections, calculated using the eikonal model, is
discussed in the context of soft photoproduction. We present a comprehensive
calculation considering the total,elastic and diffractive cross sections
jointly. We examine the differences between our results and those obtained from
the supercritical Pomeron-Reggeon model with no unitarity corrections.
| [
{
"created": "Tue, 5 Jul 1994 12:57:47 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Jul 1994 13:20:57 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Jul 1994 14:40:32 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Gotsman",
"E.",
""
],
[
"Levin",
"E. M.",
""
],
[
"Maor",
"U.",
""
]
] | The role of screening corrections, calculated using the eikonal model, is discussed in the context of soft photoproduction. We present a comprehensive calculation considering the total,elastic and diffractive cross sections jointly. We examine the differences between our results and those obtained from the supercritical Pomeron-Reggeon model with no unitarity corrections. |
hep-ph/0412298 | Paul Romatschke | Eduardo S. Fraga and Paul Romatschke | The role of quark mass in cold and dense perturbative QCD | 5 pages REVTEX4, 4 figures; minor changes, matches published version | Phys.Rev. D71 (2005) 105014 | 10.1103/PhysRevD.71.105014 | BI-TP 2004/39 | hep-ph astro-ph nucl-th | null | We consider the equation of state of QCD at high density and zero temperature
in perturbation theory to first order in the coupling constant $\alpha_s$. We
compute the thermodynamic potential including the effect of a non-vanishing
mass for the strange quark and show that corrections are sizable.
Renormalization group running of the coupling and the strange quark mass plays
a crucial role. The structure of quark stars is dramatically modified.
| [
{
"created": "Tue, 21 Dec 2004 07:02:41 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2005 12:56:42 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Fraga",
"Eduardo S.",
""
],
[
"Romatschke",
"Paul",
""
]
] | We consider the equation of state of QCD at high density and zero temperature in perturbation theory to first order in the coupling constant $\alpha_s$. We compute the thermodynamic potential including the effect of a non-vanishing mass for the strange quark and show that corrections are sizable. Renormalization group running of the coupling and the strange quark mass plays a crucial role. The structure of quark stars is dramatically modified. |
hep-ph/9602313 | Alexander Moroz | Alexander Moroz and Jan Fischer | A Surprise in Sum Rules - Modulating Factors | 12 pp, plain latex + 1 ps figure uuencoded | null | null | TH-CERN/96-39, TPBU-95-06 | hep-ph cond-mat hep-th quant-ph | null | A generic physical situation is considered where Im $\Pi$, the imaginary part
of polarization operator (generalized susceptibility), can be measured on a
finite interval and the high frequency asymptotics (up to a few orders) of
$\Pi$ can be calculated theoretically. In such a case, it is desirable to
derive an equivalent form of the Kramers-Kronig dispersion relation, the
so-called sum rule, in which both the high-frequency part of Im $\Pi$ in the
dispersion integral and the high-order contribution to $\Pi$ are suppressed. We
provide a general framework for derivation of such sum rules, without any
recourse to an infinite-order differential operator. We derive sum rules for a
wide set of weight functions and show that any departure from the $e^{-t}$
behaviour of the weight function in sum rules leads to modulating factors on
the theoretical side of sum rules, providing its low frequency regularization.
We argue that by including modulating factors one can extend the domain of
validity of sum rules further to an intermediate region of frequencies and can
account for ``bumps" which were observed numerically on the phenomenological
side of sum rules at ``intermediate'' frequencies.
| [
{
"created": "Wed, 14 Feb 1996 19:22:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moroz",
"Alexander",
""
],
[
"Fischer",
"Jan",
""
]
] | A generic physical situation is considered where Im $\Pi$, the imaginary part of polarization operator (generalized susceptibility), can be measured on a finite interval and the high frequency asymptotics (up to a few orders) of $\Pi$ can be calculated theoretically. In such a case, it is desirable to derive an equivalent form of the Kramers-Kronig dispersion relation, the so-called sum rule, in which both the high-frequency part of Im $\Pi$ in the dispersion integral and the high-order contribution to $\Pi$ are suppressed. We provide a general framework for derivation of such sum rules, without any recourse to an infinite-order differential operator. We derive sum rules for a wide set of weight functions and show that any departure from the $e^{-t}$ behaviour of the weight function in sum rules leads to modulating factors on the theoretical side of sum rules, providing its low frequency regularization. We argue that by including modulating factors one can extend the domain of validity of sum rules further to an intermediate region of frequencies and can account for ``bumps" which were observed numerically on the phenomenological side of sum rules at ``intermediate'' frequencies. |
0801.1662 | Yang Bai | Yang Bai | Mini Little Higgs and Dark Matter | 5 pages, 2 figures; added references; final version in PLB | Phys.Lett.B666:332-335,2008 | 10.1016/j.physletb.2008.07.082 | FERMILAB-PUB-08-001-T | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a little Higgs model with the most minimal extension of the
standard model gauge group by an extra U(1) gauge symmetry. For specific charge
assignments of scalars, an approximate U(3) global symmetry appears in the
cutoff-squared scalar mass terms generated from gauge bosons at one-loop level.
Hence, the Higgs boson, identified as a pseudo-Goldstone boson of the broken
global symmetry, has its mass radiatively protected up to scales of 5-10 TeV.
In this model, a Z2 symmetry, ensuring the two U(1) gauge groups to be
identical, also makes the extra massive neutral gauge boson stable and a viable
dark matter candidate with a promising prospect of direct detection.
| [
{
"created": "Thu, 10 Jan 2008 20:30:20 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 2008 04:40:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bai",
"Yang",
""
]
] | We construct a little Higgs model with the most minimal extension of the standard model gauge group by an extra U(1) gauge symmetry. For specific charge assignments of scalars, an approximate U(3) global symmetry appears in the cutoff-squared scalar mass terms generated from gauge bosons at one-loop level. Hence, the Higgs boson, identified as a pseudo-Goldstone boson of the broken global symmetry, has its mass radiatively protected up to scales of 5-10 TeV. In this model, a Z2 symmetry, ensuring the two U(1) gauge groups to be identical, also makes the extra massive neutral gauge boson stable and a viable dark matter candidate with a promising prospect of direct detection. |
2402.15673 | Xingyu Guo | Xingyu Guo, Jinfeng Liao, and Hongxi Xing | Studying exotic hadrons in high energy nuclear collisions | 4 pages, 4 figures, contribution to the proceeding of Quark Matter
2023. arXiv admin note: text overlap with arXiv:2302.03828 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Studies of exotic hadrons such as the $\chi_{cl}(3872)$ state provide crucial
insights into the fundamental force governing the strong interaction dynamics,
with an emerging new frontier to investigate their production in high energy
nuclear collisions where a partonic medium is present. This contribution
discusses the production mechanisms of exotic hadrons in such collisions and
analyzes novel effects from the partonic medium, demonstrating the potential to
use heavy ion measurements for deciphering their internal structure and
understanding their in-medium evolutions.
| [
{
"created": "Sat, 24 Feb 2024 01:12:33 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Guo",
"Xingyu",
""
],
[
"Liao",
"Jinfeng",
""
],
[
"Xing",
"Hongxi",
""
]
] | Studies of exotic hadrons such as the $\chi_{cl}(3872)$ state provide crucial insights into the fundamental force governing the strong interaction dynamics, with an emerging new frontier to investigate their production in high energy nuclear collisions where a partonic medium is present. This contribution discusses the production mechanisms of exotic hadrons in such collisions and analyzes novel effects from the partonic medium, demonstrating the potential to use heavy ion measurements for deciphering their internal structure and understanding their in-medium evolutions. |
hep-ph/0105072 | Per Osland | A.I. Davydychev (Mainz), P. Osland, L. Saks (Bergen) | Quark mass dependence of the one-loop three-gluon vertex in arbitrary
dimension | 21 pages, including 2 figures | JHEP 0108:050,2001 | 10.1088/1126-6708/2001/08/050 | MZ-TH/01-14 | hep-ph | null | The one-loop off-shell massive quark contribution to the three-gluon vertex
is calculated in an arbitrary space-time dimension. The results for all
relevant on-shell and symmetric limits are obtained directly from the general
off-shell results. The analytic structure of the results for the relevant
massive scalar integrals is also discussed.
| [
{
"created": "Tue, 8 May 2001 16:57:02 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Davydychev",
"A. I.",
"",
"Mainz"
],
[
"Osland",
"P.",
"",
"Bergen"
],
[
"Saks",
"L.",
"",
"Bergen"
]
] | The one-loop off-shell massive quark contribution to the three-gluon vertex is calculated in an arbitrary space-time dimension. The results for all relevant on-shell and symmetric limits are obtained directly from the general off-shell results. The analytic structure of the results for the relevant massive scalar integrals is also discussed. |
hep-ph/9209239 | null | Peter Cho and Howard Georgi | Electromagnetic Interactions in Heavy Hadron Chiral Theory | 12 pages, 0 figures | Phys.Lett.B296:408-414,1992; ERRATUM-ibid.B300:410,1993 | 10.1016/0370-2693(92)91340-F | HUTP-92/A043 | hep-ph | null | Electromagnetic interactions are incorporated into Heavy Hadron Chiral
Perturbation Theory. Short and long distance magnetic moment contributions to
the chiral Lagrangian are identified, and $M1$ radiative decays of heavy vector
mesons and sextet baryons are studied. Using recent CLEO $D^*$ branching
fraction ratio data, we fit the meson coupling to the axial vector Goldstone
current and find $g_1^2 = 0.34 \pm 0.48$ for $\mc = 1700 \MeV$. Finally, we
obtain model independent predictions for total and partial widths of charm and
bottom vector mesons.
| [
{
"created": "Tue, 15 Sep 1992 21:37:04 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Cho",
"Peter",
""
],
[
"Georgi",
"Howard",
""
]
] | Electromagnetic interactions are incorporated into Heavy Hadron Chiral Perturbation Theory. Short and long distance magnetic moment contributions to the chiral Lagrangian are identified, and $M1$ radiative decays of heavy vector mesons and sextet baryons are studied. Using recent CLEO $D^*$ branching fraction ratio data, we fit the meson coupling to the axial vector Goldstone current and find $g_1^2 = 0.34 \pm 0.48$ for $\mc = 1700 \MeV$. Finally, we obtain model independent predictions for total and partial widths of charm and bottom vector mesons. |
hep-ph/9705356 | Yuval Grossman | Yuval Grossman and Helen R. Quinn | Removing Discrete Ambiguities in CP Asymmetry Measurements | 23 pages, revtex, no figures | Phys. Rev. D 56, 7259 (1997) | 10.1103/PhysRevD.56.7259 | SLAC-PUB-7454 | hep-ph | null | We discuss methods to resolve the ambiguities in CP violating phase angles
$\phi$ that are left when a measurement of $\sin 2 \phi$ is made. We show what
knowledge of hadronic quantities will be needed to fully resolve all such
ambiguities.
| [
{
"created": "Mon, 19 May 1997 20:06:00 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Grossman",
"Yuval",
""
],
[
"Quinn",
"Helen R.",
""
]
] | We discuss methods to resolve the ambiguities in CP violating phase angles $\phi$ that are left when a measurement of $\sin 2 \phi$ is made. We show what knowledge of hadronic quantities will be needed to fully resolve all such ambiguities. |
0810.5443 | Carlo Giunti | H.L. Ge, C. Giunti, Q.Y. Liu | Bayesian Constraints on theta_{13} from Solar and KamLAND Neutrino Data | 21 pages. Final version published in Phys. Rev. D 80 (2009) 053009 | Phys.Rev.D80:053009,2009 | 10.1103/PhysRevD.80.053009 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of a Bayesian analysis of solar and KamLAND neutrino
data in the framework of three-neutrino mixing. We adopt two approaches for the
prior probability distribution of the oscillation parameters Delta m^2_{21},
sin^2 theta_{12}, sin^2 theta_{13}: 1) a traditional flat uninformative prior;
2) an informative prior which describes the limits on sin^2 theta_{13} obtained
in atmospheric and long-baseline accelerator and reactor neutrino experiments.
In both approaches, we present the allowed regions in the sin^2 theta_{13} -
Delta m^2_{21} and sin^2 theta_{12} - sin^2 theta_{13} planes, as well as the
marginal posterior probability distribution of sin^2 theta_{13}. We confirm the
1.2 sigma hint of theta_{13} > 0 found in hep-ph/0806.2649 from the analysis of
solar and KamLAND neutrino data. We found that the statistical significance of
the hint is reduced to about 0.8 sigma by the constraints on sin^2 theta_{13}
coming from atmospheric and long-baseline accelerator and reactor neutrino
data, in agreement with arXiv:0808.2016.
| [
{
"created": "Thu, 30 Oct 2008 08:43:15 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2009 12:10:12 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Sep 2009 11:58:04 GMT",
"version": "v3"
}
] | 2010-04-28 | [
[
"Ge",
"H. L.",
""
],
[
"Giunti",
"C.",
""
],
[
"Liu",
"Q. Y.",
""
]
] | We present the results of a Bayesian analysis of solar and KamLAND neutrino data in the framework of three-neutrino mixing. We adopt two approaches for the prior probability distribution of the oscillation parameters Delta m^2_{21}, sin^2 theta_{12}, sin^2 theta_{13}: 1) a traditional flat uninformative prior; 2) an informative prior which describes the limits on sin^2 theta_{13} obtained in atmospheric and long-baseline accelerator and reactor neutrino experiments. In both approaches, we present the allowed regions in the sin^2 theta_{13} - Delta m^2_{21} and sin^2 theta_{12} - sin^2 theta_{13} planes, as well as the marginal posterior probability distribution of sin^2 theta_{13}. We confirm the 1.2 sigma hint of theta_{13} > 0 found in hep-ph/0806.2649 from the analysis of solar and KamLAND neutrino data. We found that the statistical significance of the hint is reduced to about 0.8 sigma by the constraints on sin^2 theta_{13} coming from atmospheric and long-baseline accelerator and reactor neutrino data, in agreement with arXiv:0808.2016. |
1209.1866 | Masaki Yasue | Masaki Yasue | Generalized Scaling in Flavor Neutrino Masses | 12 pages, 8 figures, Abstract modified, Sec.2 and Sec.3
reconstructed, 3 figures removed | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scaling in flavor neutrino masses $M_{ij}$ ($i,j$=$e,\mu,\tau$) can be
described by two angles: $\theta_{SC}$ and the atmospheric neutrino mixing
angle $\theta_{23}$. For $A$=${\cos ^2}{\theta_{SC}}+{\sin
^2}{\theta_{SC}}t_{23}^4$ and B=${\cos ^2}{\theta_{SC}}-{\sin
^2}{\theta_{SC}}t_{23}^2$, where $t_{23}=\tan\theta_{23}$, our scaling ansatz
dictates that $M_{i\tau}/M_{i\mu}$ = $- \kappa_it_{23}$ ($i$=$e,\mu,\tau$) with
$\kappa_e$=1, $\kappa_\mu$=B/A and $\kappa_\tau$=1/B and leads to the vanishing
reactor neutrino mixing angle $\theta_{13}=0$. This generalized scaling is
naturally realized in seesaw textures. To obtain $\theta_{13}\neq 0$ as
required by the recent experimental results, we introduce breaking terms of
scaling ansatz, which are taken to keep $M_{\mu\tau}/M_{\mu\mu}$ = $-
\kappa_\mu t_{23}$ intact even at $\theta_{13}\neq 0$. We derive relations that
connect CP violating phases with phases of flavor neutrino masses, which are
found to be numerically supported. The angle $\theta_{SC}$ is observed to be
$0.91 \lesssim\sin^2\theta_{SC}\lesssim 0.93$ for the normal mass hierarchy and
$\sin^2\theta_{SC}\lesssim 0.33$ for the inverted mass hierarchy. Also observed
is the size of $|M_{ee}|$ to be measured in neutrinoless double beta decay,
which is 0.001-0.004 eV (0.02 eV-0.05 eV) in the normal (inverted) mass
hierarchy.
| [
{
"created": "Mon, 10 Sep 2012 02:04:34 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Oct 2012 13:02:17 GMT",
"version": "v2"
}
] | 2012-10-09 | [
[
"Yasue",
"Masaki",
""
]
] | Scaling in flavor neutrino masses $M_{ij}$ ($i,j$=$e,\mu,\tau$) can be described by two angles: $\theta_{SC}$ and the atmospheric neutrino mixing angle $\theta_{23}$. For $A$=${\cos ^2}{\theta_{SC}}+{\sin ^2}{\theta_{SC}}t_{23}^4$ and B=${\cos ^2}{\theta_{SC}}-{\sin ^2}{\theta_{SC}}t_{23}^2$, where $t_{23}=\tan\theta_{23}$, our scaling ansatz dictates that $M_{i\tau}/M_{i\mu}$ = $- \kappa_it_{23}$ ($i$=$e,\mu,\tau$) with $\kappa_e$=1, $\kappa_\mu$=B/A and $\kappa_\tau$=1/B and leads to the vanishing reactor neutrino mixing angle $\theta_{13}=0$. This generalized scaling is naturally realized in seesaw textures. To obtain $\theta_{13}\neq 0$ as required by the recent experimental results, we introduce breaking terms of scaling ansatz, which are taken to keep $M_{\mu\tau}/M_{\mu\mu}$ = $- \kappa_\mu t_{23}$ intact even at $\theta_{13}\neq 0$. We derive relations that connect CP violating phases with phases of flavor neutrino masses, which are found to be numerically supported. The angle $\theta_{SC}$ is observed to be $0.91 \lesssim\sin^2\theta_{SC}\lesssim 0.93$ for the normal mass hierarchy and $\sin^2\theta_{SC}\lesssim 0.33$ for the inverted mass hierarchy. Also observed is the size of $|M_{ee}|$ to be measured in neutrinoless double beta decay, which is 0.001-0.004 eV (0.02 eV-0.05 eV) in the normal (inverted) mass hierarchy. |
1609.01018 | Yi Liao | Shu-Yuan Guo (Nankai U.), Zhi-Long Han (Nankai U.), Yi Liao (Nankai
U., ITP, Beijing, CHEP, Peking U.) | Testing Type II Radiative Seesaw Model: from Dark Matter Detection to
LHC Signatures | v1: 27 pages, 10 figures, 5 tables; v2: added a few refs, without
other changes | Phys. Rev. D 94, 115014 (2016) | 10.1103/PhysRevD.94.115014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the testability of the type II radiative seesaw in which neutrino
mass and dark matter (DM) are related at one-loop level. Under the constraints
from DM relic density, direct and indirect detection, and invisible Higgs
decays, we find three possible regions of DM mass $M_{s_1}$ that can survive
the present and even the future experiments: (1) the Higgs resonance region
with $M_{s_1}\sim M_h/2$, (2) the Higgs region with $M_{s_1}\sim M_h$, and (3)
the coannihilation region with $M_{s_2}\sim M_{s_1}$. Here $s_{1,2}$ are two
scalar singlets with the lighter $s_1$ being the DM candidate. Based on DM
properties and direct collider constraints, we choose three benchmark points to
illustrate the testability of this model at LHC. We perform a detailed
simulation of the four-lepton and tri-lepton signatures at 13 (14) TeV LHC.
While both signatures are found to be promising at all benchmark points, the
tri-lepton one is even better: it is possible to reach the $5\sigma$
significance with an integrated luminosity of 100/fb.
| [
{
"created": "Mon, 5 Sep 2016 02:19:58 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Sep 2016 14:24:16 GMT",
"version": "v2"
}
] | 2016-12-14 | [
[
"Guo",
"Shu-Yuan",
"",
"Nankai U."
],
[
"Han",
"Zhi-Long",
"",
"Nankai U."
],
[
"Liao",
"Yi",
"",
"Nankai\n U., ITP, Beijing, CHEP, Peking U."
]
] | We analyse the testability of the type II radiative seesaw in which neutrino mass and dark matter (DM) are related at one-loop level. Under the constraints from DM relic density, direct and indirect detection, and invisible Higgs decays, we find three possible regions of DM mass $M_{s_1}$ that can survive the present and even the future experiments: (1) the Higgs resonance region with $M_{s_1}\sim M_h/2$, (2) the Higgs region with $M_{s_1}\sim M_h$, and (3) the coannihilation region with $M_{s_2}\sim M_{s_1}$. Here $s_{1,2}$ are two scalar singlets with the lighter $s_1$ being the DM candidate. Based on DM properties and direct collider constraints, we choose three benchmark points to illustrate the testability of this model at LHC. We perform a detailed simulation of the four-lepton and tri-lepton signatures at 13 (14) TeV LHC. While both signatures are found to be promising at all benchmark points, the tri-lepton one is even better: it is possible to reach the $5\sigma$ significance with an integrated luminosity of 100/fb. |
hep-ph/0309180 | Carsten van de Bruck | Ph. Brax, C. van de Bruck, A.-C. Davis and C.S. Rhodes | Branes at low energy | 5 pages, one figure; contribution to the proceedings of the Marseille
conference "Where cosmology and fundamental physics meet" | null | null | null | hep-ph astro-ph hep-th | null | Brane models at low energy are described by an effective action involving
gravity and two moduli fields associated with the brane positions. The
scalar-tensor nature of the effective theory and the coupling to matter are
explicitly spelt out. We discuss the post-Newtonian gravitational constraints
on the models, some applications to quintessence and the variations of
constants.
| [
{
"created": "Tue, 16 Sep 2003 10:32:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brax",
"Ph.",
""
],
[
"van de Bruck",
"C.",
""
],
[
"Davis",
"A. -C.",
""
],
[
"Rhodes",
"C. S.",
""
]
] | Brane models at low energy are described by an effective action involving gravity and two moduli fields associated with the brane positions. The scalar-tensor nature of the effective theory and the coupling to matter are explicitly spelt out. We discuss the post-Newtonian gravitational constraints on the models, some applications to quintessence and the variations of constants. |
0807.4598 | Vali Bashiry | K. Zeynali, V. Bashiry | Exclusive $B \rar \rho \ell^+ \ell^-$ Decay in the Standard Model with
Fourth--Generation | 17 pages, 7 figures | Phys.Rev.D78:033001,2008 | 10.1103/PhysRevD.78.033001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of the fourth generation of quarks on the
branching ratio, the CP-asymmetry and the polarization asymmetries in $B \rar
\rho \ell^+ \ell^-$ decay. Taking $|V_{t'd}V_{t'b}|\sim 0.001$ with phase about
$10^\circ$, which is consistent with the $sin2\phi_1$ of the CKM and the $B_d$
mixing parameter $\Delta m_{B_d}$, we obtain that for both ($\mu, \tau$)
channels the branching ratio is increased and the magnitude of CP-asymmetry and
polarization asymmetries decreased by the mass and mixing parameters of the 4th
generation of quarks . These results can serve as a good tool to search for new
physics effects, precisely, to search for the fourth generation of quarks($t',
b')$ via its indirect manifestations in loop diagrams.
| [
{
"created": "Tue, 29 Jul 2008 08:11:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zeynali",
"K.",
""
],
[
"Bashiry",
"V.",
""
]
] | We investigate the influence of the fourth generation of quarks on the branching ratio, the CP-asymmetry and the polarization asymmetries in $B \rar \rho \ell^+ \ell^-$ decay. Taking $|V_{t'd}V_{t'b}|\sim 0.001$ with phase about $10^\circ$, which is consistent with the $sin2\phi_1$ of the CKM and the $B_d$ mixing parameter $\Delta m_{B_d}$, we obtain that for both ($\mu, \tau$) channels the branching ratio is increased and the magnitude of CP-asymmetry and polarization asymmetries decreased by the mass and mixing parameters of the 4th generation of quarks . These results can serve as a good tool to search for new physics effects, precisely, to search for the fourth generation of quarks($t', b')$ via its indirect manifestations in loop diagrams. |
2105.12018 | Andres Daniel Perez | Ernesto Arganda, Anibal D. Medina, Andres D. Perez, Alejandro Szynkman | Towards a method to anticipate dark matter signals with deep learning at
the LHC | 52 pages, 29 figures, 3 tables. v2: Added a subsection to briefly
discuss and compare event-by-event combination versus histogram or ensemble
classifiers. v3: minor changes | SciPost Phys. 12, 063 (2022) | 10.21468/SciPostPhys.12.2.063 | null | hep-ph cs.LG hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study several simplified dark matter (DM) models and their signatures at
the LHC using neural networks. We focus on the usual monojet plus missing
transverse energy channel, but to train the algorithms we organize the data in
2D histograms instead of event-by-event arrays. This results in a large
performance boost to distinguish between standard model (SM) only and SM plus
new physics signals. We use the kinematic monojet features as input data which
allow us to describe families of models with a single data sample. We found
that the neural network performance does not depend on the simulated number of
background events if they are presented as a function of $S/\sqrt{B}$, where
$S$ and $B$ are the number of signal and background events per histogram,
respectively. This provides flexibility to the method, since testing a
particular model in that case only requires knowing the new physics monojet
cross section. Furthermore, we also discuss the network performance under
incorrect assumptions about the true DM nature. Finally, we propose multimodel
classifiers to search and identify new signals in a more general way, for the
next LHC run.
| [
{
"created": "Tue, 25 May 2021 15:38:13 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 2021 01:13:19 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Dec 2021 15:46:24 GMT",
"version": "v3"
}
] | 2022-03-09 | [
[
"Arganda",
"Ernesto",
""
],
[
"Medina",
"Anibal D.",
""
],
[
"Perez",
"Andres D.",
""
],
[
"Szynkman",
"Alejandro",
""
]
] | We study several simplified dark matter (DM) models and their signatures at the LHC using neural networks. We focus on the usual monojet plus missing transverse energy channel, but to train the algorithms we organize the data in 2D histograms instead of event-by-event arrays. This results in a large performance boost to distinguish between standard model (SM) only and SM plus new physics signals. We use the kinematic monojet features as input data which allow us to describe families of models with a single data sample. We found that the neural network performance does not depend on the simulated number of background events if they are presented as a function of $S/\sqrt{B}$, where $S$ and $B$ are the number of signal and background events per histogram, respectively. This provides flexibility to the method, since testing a particular model in that case only requires knowing the new physics monojet cross section. Furthermore, we also discuss the network performance under incorrect assumptions about the true DM nature. Finally, we propose multimodel classifiers to search and identify new signals in a more general way, for the next LHC run. |
hep-ph/0108004 | Youngjoon Kwon | C.S. Kim, Y. Kwon, Jake Lee, and W. Namgung | Test of Factorization Hypothesis from Exclusive Non-leptonic B decays | 11 pages; submitted to PRD | Phys.Rev. D65 (2002) 097503 | 10.1103/PhysRevD.65.097503 | null | hep-ph | null | We investigate the possibility of testing factorization hypothesis in
non-leptonic exclusive decays of B-meson. In particular, we considered the non
factorizable \bar{B^0} -> D^{(*)+} D_s^{(*)-} modes and \bar{B^0} -> D^{(*)+}
(\pi^-, \rho^-) known as well-factorizable modes. By taking the ratios
BR(\bar{B^0}-> D^{(*)+}D_s^{(*)-})/BR(\bar{B^0}-> D^{(*)+}(\pi^-,\rho^-)), we
found that under the present theoretical and experimental uncertainties there's
no evidence for the breakdown of factorization description to heavy-heavy
decays of the B meson.
| [
{
"created": "Wed, 1 Aug 2001 15:40:01 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kim",
"C. S.",
""
],
[
"Kwon",
"Y.",
""
],
[
"Lee",
"Jake",
""
],
[
"Namgung",
"W.",
""
]
] | We investigate the possibility of testing factorization hypothesis in non-leptonic exclusive decays of B-meson. In particular, we considered the non factorizable \bar{B^0} -> D^{(*)+} D_s^{(*)-} modes and \bar{B^0} -> D^{(*)+} (\pi^-, \rho^-) known as well-factorizable modes. By taking the ratios BR(\bar{B^0}-> D^{(*)+}D_s^{(*)-})/BR(\bar{B^0}-> D^{(*)+}(\pi^-,\rho^-)), we found that under the present theoretical and experimental uncertainties there's no evidence for the breakdown of factorization description to heavy-heavy decays of the B meson. |
2204.00543 | Patrick Barry | P. C. Barry, C. Egerer, J. Karpie, W. Melnitchouk, C. Monahan, K.
Orginos, Jian-Wei Qiu, D. Richards, N. Sato, R. S. Sufian, S. Zafeiropoulos | Complementarity of experimental and lattice QCD data on pion parton
distributions | 47 pages, 15 figures | null | 10.1103/PhysRevD.105.114051 | JLAB-THY-22-3592 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extract pion parton distribution functions (PDFs) in a Monte Carlo global
QCD analysis of experimental data together with reduced Ioffe time
pseudo-distributions and matrix elements of current-current correlators
generated from lattice QCD. By including both experimental and lattice QCD
data, our analysis rigorously quantifies both the uncertainties of the pion
PDFs and systematic effects intrinsic to the lattice QCD observables. The
reduced Ioffe time pseudo-distributions significantly decrease the
uncertainties on the PDFs, while the current-current correlators are limited by
the systematic effects associated with the lattice. Consistent with recent
phenomenological determinations, the behavior of the valence quark distribution
of the pion at large momentum fraction is found to be $\sim (1-x)^{ \beta_{\rm
eff}}$ with $\beta_{\rm eff} \approx 1.0-1.2$.
| [
{
"created": "Fri, 1 Apr 2022 16:12:15 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2022 19:30:55 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Barry",
"P. C.",
""
],
[
"Egerer",
"C.",
""
],
[
"Karpie",
"J.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Monahan",
"C.",
""
],
[
"Orginos",
"K.",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Richards",
"D.",
""
],
[
"Sato",
"N.",
""
],
[
"Sufian",
"R. S.",
""
],
[
"Zafeiropoulos",
"S.",
""
]
] | We extract pion parton distribution functions (PDFs) in a Monte Carlo global QCD analysis of experimental data together with reduced Ioffe time pseudo-distributions and matrix elements of current-current correlators generated from lattice QCD. By including both experimental and lattice QCD data, our analysis rigorously quantifies both the uncertainties of the pion PDFs and systematic effects intrinsic to the lattice QCD observables. The reduced Ioffe time pseudo-distributions significantly decrease the uncertainties on the PDFs, while the current-current correlators are limited by the systematic effects associated with the lattice. Consistent with recent phenomenological determinations, the behavior of the valence quark distribution of the pion at large momentum fraction is found to be $\sim (1-x)^{ \beta_{\rm eff}}$ with $\beta_{\rm eff} \approx 1.0-1.2$. |
2207.02718 | Mauro Giannini | M. M. Giannini | An improved upper limit for the (muon based) neutrino mass | 5 pages, 2 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The width for the mu decay is calculated in the V-A theory leaving open the
possibility of non zero neutrino masses. It is shown that not only the
agreement with the experimental data is kept, but the smallness of the
experimental error allows to improve the constraint of nu mass (muon based)
down to 0.021 MeV, provided that nu mass (electron based) is as low as
indicated by the 3H beta decay. An analogous constraint for the nu mass (tau
based) is not possible since in this case the decay width has a larger
experimental error.
| [
{
"created": "Wed, 6 Jul 2022 14:44:13 GMT",
"version": "v1"
}
] | 2022-07-07 | [
[
"Giannini",
"M. M.",
""
]
] | The width for the mu decay is calculated in the V-A theory leaving open the possibility of non zero neutrino masses. It is shown that not only the agreement with the experimental data is kept, but the smallness of the experimental error allows to improve the constraint of nu mass (muon based) down to 0.021 MeV, provided that nu mass (electron based) is as low as indicated by the 3H beta decay. An analogous constraint for the nu mass (tau based) is not possible since in this case the decay width has a larger experimental error. |
hep-ph/9811438 | Alessandro Strumia | Alessandro Strumia and Nikolaos Tetradis | Bubble-nucleation rates for radiatively induced first-order phase
transitions | 19 pages, 5 figures. Misprint fixed | Nucl.Phys.B554:697-718,1999 | 10.1016/S0550-3213(99)00285-0 | IFUP-TH/98-54 and SNS-PH/98-24 | hep-ph | null | We present a consistent calculation of bubble-nucleation rates in theories of
two scalar fields. Our approach is based on the notion of a coarse-grained free
energy that incorporates the effects of fluctuations with momenta above a given
scale k. We establish the reliability of the method for a variety of two-scalar
models and confirm the conclusions of previous studies in one-field theories:
Langer's theory of homogeneous nucleation is applicable as long as the
expansion around the semiclassical saddle point associated with tunnelling is
convergent. This expansion breaks down when the exponential suppression of the
rate by the saddle-point action becomes comparable to the pre-exponential
factor associated with fluctuations around the saddle point. We reconfirm that
Langer's theory is not applicable to the case of weakly first-oder phase
transitions. We also find that the same is true in general for radiatively
induced first-order phase transitions. We discuss the relevance of our results
for the electroweak phase transition and the metastability bound on the
Higgs-boson mass.
| [
{
"created": "Mon, 23 Nov 1998 11:41:13 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 1999 11:48:04 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Jun 1999 10:28:27 GMT",
"version": "v3"
}
] | 2009-10-09 | [
[
"Strumia",
"Alessandro",
""
],
[
"Tetradis",
"Nikolaos",
""
]
] | We present a consistent calculation of bubble-nucleation rates in theories of two scalar fields. Our approach is based on the notion of a coarse-grained free energy that incorporates the effects of fluctuations with momenta above a given scale k. We establish the reliability of the method for a variety of two-scalar models and confirm the conclusions of previous studies in one-field theories: Langer's theory of homogeneous nucleation is applicable as long as the expansion around the semiclassical saddle point associated with tunnelling is convergent. This expansion breaks down when the exponential suppression of the rate by the saddle-point action becomes comparable to the pre-exponential factor associated with fluctuations around the saddle point. We reconfirm that Langer's theory is not applicable to the case of weakly first-oder phase transitions. We also find that the same is true in general for radiatively induced first-order phase transitions. We discuss the relevance of our results for the electroweak phase transition and the metastability bound on the Higgs-boson mass. |
0708.3351 | Shunji Yoshimoto | Masayasu Harada, Yukio Nemoto and Shunji Yoshimoto (Nagoya Univ.) | Quasi-quark spectrum in the chiral symmetric phase from the
Schwinger-Dyson equation | 21 pages, 11 figures; This is the version published in
Prog.Theor.Phys | Prog.Theor.Phys. 119 (2008) 117-137 | 10.1143/PTP.119.117 | null | hep-ph | null | We non-perturbatively study the fermion spectrum in the chiral symmetric
phase from the Schwinger-Dyson equation with the Feynman gauge, in which we
perform an analytic continuation of the solution on the imaginary time axis to
the real time axis with a method employing an integral equation. It is shown
that the fermion spectrum has two peaks, which correspond to the normal
quasi-fermion and the plasmino, although these peaks in the strong coupling
region are very broad, owing to multiple scatterings with gauge bosons. We find
that the thermal mass of the quasi-fermion saturates at some value of the gauge
coupling, beyond which the thermal (pole) mass satisfies $M \sim T$,
independently of the value of the gauge coupling. We also comment on the
appearance of a three-peak structure in the fermion spectrum as a
non-perturbative effect.
| [
{
"created": "Fri, 24 Aug 2007 14:44:22 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2007 13:55:13 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jan 2008 15:10:43 GMT",
"version": "v3"
}
] | 2008-01-24 | [
[
"Harada",
"Masayasu",
"",
"Nagoya Univ."
],
[
"Nemoto",
"Yukio",
"",
"Nagoya Univ."
],
[
"Yoshimoto",
"Shunji",
"",
"Nagoya Univ."
]
] | We non-perturbatively study the fermion spectrum in the chiral symmetric phase from the Schwinger-Dyson equation with the Feynman gauge, in which we perform an analytic continuation of the solution on the imaginary time axis to the real time axis with a method employing an integral equation. It is shown that the fermion spectrum has two peaks, which correspond to the normal quasi-fermion and the plasmino, although these peaks in the strong coupling region are very broad, owing to multiple scatterings with gauge bosons. We find that the thermal mass of the quasi-fermion saturates at some value of the gauge coupling, beyond which the thermal (pole) mass satisfies $M \sim T$, independently of the value of the gauge coupling. We also comment on the appearance of a three-peak structure in the fermion spectrum as a non-perturbative effect. |
1512.04545 | Eric Kuflik | Eric Kuflik, Maxim Perelstein, Nicolas Rey-Le Lorier, Yu-Dai Tsai | Elastically Decoupling Dark Matter | 6 pages, 3 figures | Phys. Rev. Lett. 116, 221302 (2016) | 10.1103/PhysRevLett.116.221302 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel dark matter candidate, an Elastically Decoupling Relic
(ELDER), which is a cold thermal relic whose present abundance is determined by
the cross-section of its elastic scattering on Standard Model particles. The
dark matter candidate is predicted to have a mass ranging from a few to a few
hundred MeV, and an elastic scattering cross-section with electrons, photons
and/or neutrinos in the $10^{-3}-1$ fb range.
| [
{
"created": "Mon, 14 Dec 2015 21:01:04 GMT",
"version": "v1"
}
] | 2016-06-08 | [
[
"Kuflik",
"Eric",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Lorier",
"Nicolas Rey-Le",
""
],
[
"Tsai",
"Yu-Dai",
""
]
] | We present a novel dark matter candidate, an Elastically Decoupling Relic (ELDER), which is a cold thermal relic whose present abundance is determined by the cross-section of its elastic scattering on Standard Model particles. The dark matter candidate is predicted to have a mass ranging from a few to a few hundred MeV, and an elastic scattering cross-section with electrons, photons and/or neutrinos in the $10^{-3}-1$ fb range. |
2103.02058 | Daniel Moreno Torres | Th. Mannel, D. Moreno, and A. A. Pivovarov | The Heavy Quark Expansion for the Charm Quark | 4 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that one can re-arrange the Heavy Quark Expansion for inclusive weak
decays of charmed hadrons in such a way that the resulting expansion is an
expansion in $\Lambda_{\rm QCD} / m_c$ and $\alpha_s (m_c)$ with order-one
coefficients. Unlike in the case of the bottom quark, the leading term includes
not only the contribution of the free-quark decay, but also a tower of terms
related to matrix elements of four quark operators.
| [
{
"created": "Tue, 2 Mar 2021 22:13:29 GMT",
"version": "v1"
}
] | 2021-03-04 | [
[
"Mannel",
"Th.",
""
],
[
"Moreno",
"D.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] | We show that one can re-arrange the Heavy Quark Expansion for inclusive weak decays of charmed hadrons in such a way that the resulting expansion is an expansion in $\Lambda_{\rm QCD} / m_c$ and $\alpha_s (m_c)$ with order-one coefficients. Unlike in the case of the bottom quark, the leading term includes not only the contribution of the free-quark decay, but also a tower of terms related to matrix elements of four quark operators. |
hep-ph/0109049 | Walter Grimus | G.V. Dass, W. Grimus | Testing the Wigner - Weisskopf approximation by using neutral-meson -
antimeson correlated states | 9 pages, latex, no figures | Phys.Lett. B521 (2001) 267-272 | 10.1016/S0370-2693(01)01196-0 | UWThPh-2001-35 | hep-ph | null | We phenomenologically decompose the Weisskopf--Wigner approximation, as
applied to the neutral flavoured meson complexes, into three pieces and propose
tests for these pieces. Our tests hold for general decay amplitudes and
$M^0$--$\bar M^0$ mixing parameters. We concentrate on C-odd $M^0 \bar M^0$
states and stress the importance of such tests in view of the variety of
physics extracted from measurements on such complexes. Studying the feasibility
of the tests confines one to the $K^0 \bar K^0$ system at present. In
particular, we show that the time dependence of the correlated decay $\phi \to
K^0 \bar K^0 \to 2 (\pi^+ \pi^-)$ is determined solely by the WWA and provides
thus a clean test of it.
| [
{
"created": "Thu, 6 Sep 2001 13:02:53 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dass",
"G. V.",
""
],
[
"Grimus",
"W.",
""
]
] | We phenomenologically decompose the Weisskopf--Wigner approximation, as applied to the neutral flavoured meson complexes, into three pieces and propose tests for these pieces. Our tests hold for general decay amplitudes and $M^0$--$\bar M^0$ mixing parameters. We concentrate on C-odd $M^0 \bar M^0$ states and stress the importance of such tests in view of the variety of physics extracted from measurements on such complexes. Studying the feasibility of the tests confines one to the $K^0 \bar K^0$ system at present. In particular, we show that the time dependence of the correlated decay $\phi \to K^0 \bar K^0 \to 2 (\pi^+ \pi^-)$ is determined solely by the WWA and provides thus a clean test of it. |
hep-ph/0207189 | Fabrizio Gabbiani | F. Gabbiani and G. Valencia | Vector-meson contributions do not explain the rate and spectrum in K_L
-> pi0 gamma gamma | Version accepted for publication on Phys. Rev. D. 19 pages, LaTeX, 8
figures, uses epsf.sty | Phys.Rev. D66 (2002) 074006 | 10.1103/PhysRevD.66.074006 | null | hep-ph hep-ex | null | We analyze the recent NA48 data for the reaction K_L -> pi0 gamma gamma with
and without the assumption of vector meson dominance (VMD). We find that the
data is well described by a three-parameter expression inspired by O(p^6)
chiral perturbation theory. We also find that it is impossible to fit the shape
of the decay distribution and the overall rate simultaneously if one imposes
the VMD constraints on the three parameters. We comment on the different fits
and their implications for the CP-conserving component of the decay K_L -> pi0
e+ e-.
| [
{
"created": "Mon, 15 Jul 2002 18:57:03 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2002 01:25:09 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Aug 2002 16:19:00 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Gabbiani",
"F.",
""
],
[
"Valencia",
"G.",
""
]
] | We analyze the recent NA48 data for the reaction K_L -> pi0 gamma gamma with and without the assumption of vector meson dominance (VMD). We find that the data is well described by a three-parameter expression inspired by O(p^6) chiral perturbation theory. We also find that it is impossible to fit the shape of the decay distribution and the overall rate simultaneously if one imposes the VMD constraints on the three parameters. We comment on the different fits and their implications for the CP-conserving component of the decay K_L -> pi0 e+ e-. |
hep-ph/0312155 | Yann Mambrini | Pierre Binetruy, Yann Mambrini, Emmanuel Nezri | Direct and Indirect Detection of Dark Matter in Heterotic Orbifold
Models | 29 pages, 13 figures. Notations clarified, figures improved, typos
and english corrected | Astropart.Phys.22:1-18,2004 | 10.1016/j.astropartphys.2004.05.010 | null | hep-ph astro-ph | null | We study the neutralino dark matter phenomenology in the context of effective
field theories derived from the weakly--coupled heterotic string. We consider
in particular direct detection and indirect detection with neutrino telescopes
rates. The two cases of moduli dominated and dilaton dominated SUSY breaking
lead to completely different phenomenologies. Even if in both cases relic
density constraints can be fulfilled, moduli domination generically leads to
detection rates which are much below the present and future experimental
sensitivities, whereas dilaton domination gives high detection rates accessible
to the next generation of experiments. This could make dark matter searches an
alternative way to constrain high energy fundamental parameters.
| [
{
"created": "Thu, 11 Dec 2003 16:22:46 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 2004 09:32:05 GMT",
"version": "v2"
}
] | 2011-05-23 | [
[
"Binetruy",
"Pierre",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Nezri",
"Emmanuel",
""
]
] | We study the neutralino dark matter phenomenology in the context of effective field theories derived from the weakly--coupled heterotic string. We consider in particular direct detection and indirect detection with neutrino telescopes rates. The two cases of moduli dominated and dilaton dominated SUSY breaking lead to completely different phenomenologies. Even if in both cases relic density constraints can be fulfilled, moduli domination generically leads to detection rates which are much below the present and future experimental sensitivities, whereas dilaton domination gives high detection rates accessible to the next generation of experiments. This could make dark matter searches an alternative way to constrain high energy fundamental parameters. |
1402.0162 | G.R. Boroun | G.R. Boroun and M. Amiri | Laguerre polynomials method in the valon model | arXiv admin note: text overlap with arXiv:hep-ph/9904264 by other
authors | Phys. Scr. 88 (2013) 035102 | 10.1088/0031-8949/88/03/035102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We used the Laguerre polynomials method for determination of the proton
structure function in the valon model. We have examined the applicability of
the valon model with respect to a very elegant method, where the structure of
the proton is determined by expanding valon distributions and valon structure
functions on Laguerre polynomials. We compared our results with the
experimental data, GJR parameterization and DL model. Having checked, this
method gives a good description for the proton structure function in valon
model.
| [
{
"created": "Sun, 2 Feb 2014 09:25:19 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 10:24:07 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Nov 2016 04:56:53 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Nov 2016 15:35:31 GMT",
"version": "v4"
}
] | 2016-11-16 | [
[
"Boroun",
"G. R.",
""
],
[
"Amiri",
"M.",
""
]
] | We used the Laguerre polynomials method for determination of the proton structure function in the valon model. We have examined the applicability of the valon model with respect to a very elegant method, where the structure of the proton is determined by expanding valon distributions and valon structure functions on Laguerre polynomials. We compared our results with the experimental data, GJR parameterization and DL model. Having checked, this method gives a good description for the proton structure function in valon model. |
1811.08183 | Susana Coito | Susana Coito | Radially excited $\psi$ mesons and the $Y$ enhancements | 7 pages, 4 figures, Conference Proceedings of "XIIIth Quark
Confinement and Hadron Spectrum", 31 July - 6 August 2018 Maynooth
University, Ireland | null | 10.22323/1.336.0105 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While many properties of the vector charmonium first excitations are yet to
be measured, enhancements at unexpected energies are intriguing, alias the $Y$
states. In order to understand the naturally unquenched mesonic line-shapes,
the influence of the most relevant hadronic decay channels must be taken into
account. Within an unitary effective approach we present results where mesonic
loops are included in an equivalent manner to coupled-channels. We show results
for the $\psi(3770)$ and $\psi(4160)$ systems, where we find the
nonperturbative effects of dynamical generation of poles and line-shape
distortion.
| [
{
"created": "Tue, 20 Nov 2018 11:20:21 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Coito",
"Susana",
""
]
] | While many properties of the vector charmonium first excitations are yet to be measured, enhancements at unexpected energies are intriguing, alias the $Y$ states. In order to understand the naturally unquenched mesonic line-shapes, the influence of the most relevant hadronic decay channels must be taken into account. Within an unitary effective approach we present results where mesonic loops are included in an equivalent manner to coupled-channels. We show results for the $\psi(3770)$ and $\psi(4160)$ systems, where we find the nonperturbative effects of dynamical generation of poles and line-shape distortion. |
hep-ph/9605280 | A. Dolgov | A.D. Dolgov | Antimatter in Different Baryogenesis Scenarios | Latex, 9 pages, presented at International Workshop on Baryon
Instability, Oak Ridge, Tennessee, March 28-39, 1996. (to be published in the
Proceedings) | null | null | TAC-1996-010 | hep-ph astro-ph | null | Possible mechanisms of abundant creation of antimatter in the universe are
reviewed. The necessary conditions for that are: baryonic charge
nonconservation, spontaneous breaking of charge symmetry or nonequilibrium
initial state, and the formation of appropriate initial conditions during
inflation. In this case the universe may be populated with domains, cells, or
even stellar size objects consisting of antimatter.
| [
{
"created": "Sat, 11 May 1996 22:13:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dolgov",
"A. D.",
""
]
] | Possible mechanisms of abundant creation of antimatter in the universe are reviewed. The necessary conditions for that are: baryonic charge nonconservation, spontaneous breaking of charge symmetry or nonequilibrium initial state, and the formation of appropriate initial conditions during inflation. In this case the universe may be populated with domains, cells, or even stellar size objects consisting of antimatter. |
hep-ph/0004088 | Shinji Tsujikawa | S. Tsujikawa (Waseda University) | Power-law inflation with a nonminimally coupled scalar field | 12 pages, 6 figures, to appear in Phys. Rev. D | Phys.Rev. D62 (2000) 043512 | 10.1103/PhysRevD.62.043512 | WU-AP/95/00 | hep-ph astro-ph gr-qc hep-th | null | We consider the dynamics of power-law inflation with a nonminimally coupled
scalar field $\phi$. It is well known that multiple scalar fields with
exponential potentials $V(\phi)=V_0 {\rm exp}(-\sqrt{16\pi/p m_{\rm pl}^2}
\phi)$ lead to an inflationary solution even if the each scalar field is not
capable to sustain inflation. In this paper, we show that inflation can be
assisted even in the one-field case by the effect of nonminimal coupling. When
$\xi$ is positive, since an effective potential which arises by a conformal
transformation becomes flatter compared with the case of $\xi=0$ for $\phi>0$,
we have an inflationary solution even when the universe evolves as
non-inflationary in the minimally coupled case. For the negative $\xi$, the
assisted inflation can take place when $\phi$ evolves in the region of $\phi<0$
\.
| [
{
"created": "Mon, 10 Apr 2000 08:04:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Tsujikawa",
"S.",
"",
"Waseda University"
]
] | We consider the dynamics of power-law inflation with a nonminimally coupled scalar field $\phi$. It is well known that multiple scalar fields with exponential potentials $V(\phi)=V_0 {\rm exp}(-\sqrt{16\pi/p m_{\rm pl}^2} \phi)$ lead to an inflationary solution even if the each scalar field is not capable to sustain inflation. In this paper, we show that inflation can be assisted even in the one-field case by the effect of nonminimal coupling. When $\xi$ is positive, since an effective potential which arises by a conformal transformation becomes flatter compared with the case of $\xi=0$ for $\phi>0$, we have an inflationary solution even when the universe evolves as non-inflationary in the minimally coupled case. For the negative $\xi$, the assisted inflation can take place when $\phi$ evolves in the region of $\phi<0$ \. |
0801.3456 | Sunghoon Jung | Shrihari Gopalakrishna, Sunghoon Jung, James D. Wells | Higgs boson decays to four fermions through an abelian hidden sector | 5 pages, 3 figures | Phys.Rev.D78:055002,2008 | 10.1103/PhysRevD.78.055002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a generic abelian hidden sector that couples to the Standard
Model only through gauge-invariant renormalizable operators. This allows the
exotic Higgs boson to mix with the Standard Model Higgs boson, and the exotic
abelian gauge boson to mix with the Standard Model hypercharge gauge boson. One
immediate consequence of spontaneous breaking of the hidden sector gauge group
is the possible decay of the lightest Higgs boson into four fermions through
intermediate exotic gauge bosons. We study the implications of this decay for
Higgs boson phenomenology at the Fermilab Tevatron Collider and the CERN Large
Hadron Collider. Our emphasis is on the four lepton final state.
| [
{
"created": "Wed, 23 Jan 2008 13:44:41 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Sep 2008 21:07:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gopalakrishna",
"Shrihari",
""
],
[
"Jung",
"Sunghoon",
""
],
[
"Wells",
"James D.",
""
]
] | We consider a generic abelian hidden sector that couples to the Standard Model only through gauge-invariant renormalizable operators. This allows the exotic Higgs boson to mix with the Standard Model Higgs boson, and the exotic abelian gauge boson to mix with the Standard Model hypercharge gauge boson. One immediate consequence of spontaneous breaking of the hidden sector gauge group is the possible decay of the lightest Higgs boson into four fermions through intermediate exotic gauge bosons. We study the implications of this decay for Higgs boson phenomenology at the Fermilab Tevatron Collider and the CERN Large Hadron Collider. Our emphasis is on the four lepton final state. |
2108.13214 | Carlos Garcia Canal | C.A. Garc\'ia Canal | Neutrinos and strong interactions: QCD (and beyond?) | invited talk at LISHEP 2021 | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | In this talk the answer to the question: what neutrinos have to do with QCD,
the present theory of strong interactions? is presented.
The answer is positive as some strong arguments on this assertion that are
presented bring out.
| [
{
"created": "Mon, 30 Aug 2021 13:08:17 GMT",
"version": "v1"
}
] | 2021-08-31 | [
[
"Canal",
"C. A. García",
""
]
] | In this talk the answer to the question: what neutrinos have to do with QCD, the present theory of strong interactions? is presented. The answer is positive as some strong arguments on this assertion that are presented bring out. |
hep-ph/0407264 | Otavio Socolowski Jr. | Y. Hama, T. Kodama and O. Socolowski Jr | Topics on Hydrodynamic Model of Nucleus-Nucleus Collisions | 30 pages, 29 figures; corrected typos | Braz.J.Phys.35:24-51,2005 | 10.1590/S0103-97332005000100003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A survey is given on the applications of hydrodynamic model of
nucleus-nucleus collisons, focusing especially on i) the resolution of
hydrodynamic equations for arbitrary configurations, by using the
smoothed-particle hydrodynamic approach; ii) effects of the event-by-event
fluctuation of the initial conditions on the observables; iii) decoupling
criteria; iv) analytical solutions; and others.
| [
{
"created": "Thu, 22 Jul 2004 04:40:42 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2004 03:54:49 GMT",
"version": "v2"
},
{
"created": "Sun, 10 Mar 2013 16:41:41 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Hama",
"Y.",
""
],
[
"Kodama",
"T.",
""
],
[
"Socolowski",
"O.",
"Jr"
]
] | A survey is given on the applications of hydrodynamic model of nucleus-nucleus collisons, focusing especially on i) the resolution of hydrodynamic equations for arbitrary configurations, by using the smoothed-particle hydrodynamic approach; ii) effects of the event-by-event fluctuation of the initial conditions on the observables; iii) decoupling criteria; iv) analytical solutions; and others. |
1403.2204 | C. A. Dominguez | C. A. Dominguez, M. Loewe and M. Lushozi | Scalar form factor of the pion in the Kroll-Lee-Zumino field theory | null | null | null | UCT-TP-299/14 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The renormalizable Kroll-Lee-Zumino field theory of pions and a neutral
rho-meson is used to determine the scalar form factor of the pion in the
space-like region at next-to-leading order. Perturbative calculations in this
framework are parameter free, as the masses and the rho-pion-pion coupling are
known from experiment. Results compare favourably with lattice QCD
calculations.
| [
{
"created": "Mon, 10 Mar 2014 10:08:59 GMT",
"version": "v1"
}
] | 2014-03-11 | [
[
"Dominguez",
"C. A.",
""
],
[
"Loewe",
"M.",
""
],
[
"Lushozi",
"M.",
""
]
] | The renormalizable Kroll-Lee-Zumino field theory of pions and a neutral rho-meson is used to determine the scalar form factor of the pion in the space-like region at next-to-leading order. Perturbative calculations in this framework are parameter free, as the masses and the rho-pion-pion coupling are known from experiment. Results compare favourably with lattice QCD calculations. |
hep-ph/9907436 | B. F. L. Ward | S. Jadach (1 and 2), W. Placzek (2 and 3), M. Skrzypek (1 and 2),
B.F.L. Ward (2 and 4 and 5), Z. Was (1 and 2) ((1) Institute of Nuclear
Physics, Krak\'ow, Poland, (2) CERN, Theory Division, Geneva, Switzerland,
(3) Institute of Computer Science, Jagellonian University, Krak\'ow, Poland,
(4) Department of Physics and Astronomy, The University of Tennessee,
Knoxville, Tennessee, (5) SLAC, Stanford University, Stanford, California) | Final State Radiative Effects for the Exact O(alpha) YFS Exponentiated
(Un)Stable W+W- Production At and Beyond LEP2 Energies | 16 pages, 8 figures, 2 tables | Phys.Rev.D61:113010,2000 | 10.1103/PhysRevD.61.113010 | UTHEP-98-0502 | hep-ph | null | We present the LL final state radiative effects for the exact O(alpha) YFS
exponentiated (un)stable WW pair production at LEP2/NLC energies using Monte
Carlo event generator methods. The respective event generator, version 1.12 of
the program YFSWW3, wherein both Standard Model and anomalous triple gauge
boson couplings are allowed, generates n(\gamma) radiation both from the
initial state and from the intermediate W+ W- and generates the LL final state
W decay radiative effects. Sample Monte Carlo data are illustrated.
| [
{
"created": "Tue, 20 Jul 1999 20:41:13 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jan 2000 14:24:32 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Jadach",
"S.",
"",
"1 and 2"
],
[
"Placzek",
"W.",
"",
"2 and 3"
],
[
"Skrzypek",
"M.",
"",
"1 and 2"
],
[
"Ward",
"B. F. L.",
"",
"2 and 4 and 5"
],
[
"Was",
"Z.",
"",
"1 and 2"
]
] | We present the LL final state radiative effects for the exact O(alpha) YFS exponentiated (un)stable WW pair production at LEP2/NLC energies using Monte Carlo event generator methods. The respective event generator, version 1.12 of the program YFSWW3, wherein both Standard Model and anomalous triple gauge boson couplings are allowed, generates n(\gamma) radiation both from the initial state and from the intermediate W+ W- and generates the LL final state W decay radiative effects. Sample Monte Carlo data are illustrated. |
1506.03924 | Jonathan Davis | Jonathan H. Davis | The Past and Future of Light Dark Matter Direct Detection | Invited review article for the International Journal of Modern
Physics A. 20 pages, 3 figures | Int. J. Mod. Phys. A, 30, 1530038 (2015) | 10.1142/S0217751X15300380 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the status and future of direct searches for light dark matter. We
start by answering the question: `Whatever happened to the light dark matter
anomalies?' i.e. the fate of the potential dark matter signals observed by the
CoGeNT, CRESST-II, CDMS-Si and DAMA/LIBRA experiments. We discuss how the
excess events in the first two of these experiments have been explained by
previously underestimated backgrounds. For DAMA we summarise the progress and
future of mundane explanations for the annual modulation reported in its event
rate. Concerning the future of direct detection we focus on the irreducible
background from solar neutrinos. We explain broadly how it will affect future
searches and summarise efforts to mitigate its effects.
| [
{
"created": "Fri, 12 Jun 2015 08:02:03 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Davis",
"Jonathan H.",
""
]
] | We review the status and future of direct searches for light dark matter. We start by answering the question: `Whatever happened to the light dark matter anomalies?' i.e. the fate of the potential dark matter signals observed by the CoGeNT, CRESST-II, CDMS-Si and DAMA/LIBRA experiments. We discuss how the excess events in the first two of these experiments have been explained by previously underestimated backgrounds. For DAMA we summarise the progress and future of mundane explanations for the annual modulation reported in its event rate. Concerning the future of direct detection we focus on the irreducible background from solar neutrinos. We explain broadly how it will affect future searches and summarise efforts to mitigate its effects. |
1504.07848 | Takaaki Nomura | Chuan-Hung Chen, Cheng-Wei Chiang, Takaaki Nomura | Dark matter for excess of AMS-02 positrons and antiprotons | 12 pages, 3 figures, references and comments added, version to appear
in Phys. Lett. B | Phys.Lett. B747 (2015) 495-499 | 10.1016/j.physletb.2015.06.035 | IPMU15-0060 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a dark matter explanation to simultaneously account for the excess
of antiproton-to-proton and positron power spectra observed in the AMS-02
experiment while having the right dark matter relic abundance and satisfying
the current direct search bounds. We extend the Higgs triplet model with a
hidden gauge symmetry of $SU(2)_X$ that is broken to $Z_3$ by a quadruplet
scalar field, rendering the associated gauge bosons stable weakly-interacting
massive particle dark matter candidates. By coupling the complex Higgs triplet
and the $SU(2)_X$ quadruplet, the dark matter candidates can annihilate into
triplet Higgs bosons each of which in turn decays into lepton or gauge boson
final states. Such a mechanism gives rise to correct excess of positrons and
antiprotons with an appropriate choice of the triplet vacuum expectation value.
Besides, the model provides a link between neutrino mass and dark matter
phenomenology.
| [
{
"created": "Wed, 29 Apr 2015 13:11:59 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 2015 02:16:01 GMT",
"version": "v2"
}
] | 2015-06-24 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Chiang",
"Cheng-Wei",
""
],
[
"Nomura",
"Takaaki",
""
]
] | We propose a dark matter explanation to simultaneously account for the excess of antiproton-to-proton and positron power spectra observed in the AMS-02 experiment while having the right dark matter relic abundance and satisfying the current direct search bounds. We extend the Higgs triplet model with a hidden gauge symmetry of $SU(2)_X$ that is broken to $Z_3$ by a quadruplet scalar field, rendering the associated gauge bosons stable weakly-interacting massive particle dark matter candidates. By coupling the complex Higgs triplet and the $SU(2)_X$ quadruplet, the dark matter candidates can annihilate into triplet Higgs bosons each of which in turn decays into lepton or gauge boson final states. Such a mechanism gives rise to correct excess of positrons and antiprotons with an appropriate choice of the triplet vacuum expectation value. Besides, the model provides a link between neutrino mass and dark matter phenomenology. |
2003.08892 | Xiao Wang | Xiao Wang, Fa Peng Huang, and Xinmin Zhang | Phase transition dynamics and gravitational wave spectra of strong
first-order phase transition in supercooled universe | Published version in JCAP, 58 pages, 34 figures, 8 tables | JCAP05(2020)045 | 10.1088/1475-7516/2020/05/045 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phase transition dynamics may play important roles in the evolution history
of the early universe, such as its possible roles in electroweak baryogenesis
and dark matter.We systematically discuss and clarify the important details of
the phase transition dynamics during a strong first-order phase transition
(SFOPT). We classify the SFOPT into four types: slight supercooling, mild
supercooling, strong supercooling, and ultra supercooling. Using different
characteristic temperatures, length scales and bubble wall velocities, the
corresponding gravitational wave (GW) spectra are investigated in details. We
emphasize the essential importance of using the correct characteristic
temperature and length scale when the phase transition dynamics and GW spectra
are calculated. Especially, for strong supercooling and ultra supercooling
cases, there are obvious differences of the phase transition strength and GW
spectra between the results calculated at the nucleation temperature and those
derived at the percolation temperature. For ultra supercooling case, we propose
a criterion to quantify whether the phase transition can terminate. Besides the
model-independent discussions, we also study three representative models as
concrete examples to clearly show the subtle points therein.
| [
{
"created": "Thu, 19 Mar 2020 16:38:30 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2020 16:55:10 GMT",
"version": "v2"
},
{
"created": "Wed, 27 May 2020 15:45:41 GMT",
"version": "v3"
}
] | 2020-05-28 | [
[
"Wang",
"Xiao",
""
],
[
"Huang",
"Fa Peng",
""
],
[
"Zhang",
"Xinmin",
""
]
] | Phase transition dynamics may play important roles in the evolution history of the early universe, such as its possible roles in electroweak baryogenesis and dark matter.We systematically discuss and clarify the important details of the phase transition dynamics during a strong first-order phase transition (SFOPT). We classify the SFOPT into four types: slight supercooling, mild supercooling, strong supercooling, and ultra supercooling. Using different characteristic temperatures, length scales and bubble wall velocities, the corresponding gravitational wave (GW) spectra are investigated in details. We emphasize the essential importance of using the correct characteristic temperature and length scale when the phase transition dynamics and GW spectra are calculated. Especially, for strong supercooling and ultra supercooling cases, there are obvious differences of the phase transition strength and GW spectra between the results calculated at the nucleation temperature and those derived at the percolation temperature. For ultra supercooling case, we propose a criterion to quantify whether the phase transition can terminate. Besides the model-independent discussions, we also study three representative models as concrete examples to clearly show the subtle points therein. |
hep-ph/9610254 | Tsuneki Matsuki | T. Matsuki and K. Yazaki (Univ. of Tokyo) | QCD Sum Rules and the Validity of Effective Models | 10 pages, 2 Postscript figures, uses revtex.sty, epsf.sty | null | null | null | hep-ph | null | The consistency of effective models with QCD is investigated through the use
of the QCD sum rule. Taking the potential model for the heavy quark system, we
apply the method to two phenomenologically successful parameter sets, and
obtain the dependences of the model parameters on the QCD scale $\Lambda$.
Comparison with the expected scaling laws allows us to reject one of the two
sets. The method is applicable to any model which reproduces the low lying
spectra of hadronic systems.
| [
{
"created": "Sat, 5 Oct 1996 12:18:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Matsuki",
"T.",
"",
"Univ. of Tokyo"
],
[
"Yazaki",
"K.",
"",
"Univ. of Tokyo"
]
] | The consistency of effective models with QCD is investigated through the use of the QCD sum rule. Taking the potential model for the heavy quark system, we apply the method to two phenomenologically successful parameter sets, and obtain the dependences of the model parameters on the QCD scale $\Lambda$. Comparison with the expected scaling laws allows us to reject one of the two sets. The method is applicable to any model which reproduces the low lying spectra of hadronic systems. |
0706.2678 | Samoil Bilenky M. | S.M. Bilenky | CP-violation and unitarity triangle test of the Standard Model | On the basis of the lectures given to the students of SISSA (Trieste)
in 2006 | Phys.Part.Nucl.39:641-673,2008 | 10.1134/S1063779608050018 | null | hep-ph | null | Phenomenological issues of the CP violation in the quark sector of the
Standard Model are discussed. We consider quark mixing in the SM, standard and
Wolfenstein parametrization of the $CKM$ mixing matrix and unitarity triangle.
We discuss the phenomenology of the CP violation in $K^{0}_{L}$ and $B_{d}^{0}
(\bar B_{d}^{0})$-decays. The standard unitarity triangle fit of the existing
data is discussed. In appendix A we compare the $K^{0}\leftrightarrows \bar
K^{0}$, $B_{d,s}^{0}\leftrightarrows \bar B^{0}_{d,s}$ etc oscillations with
neutrino oscillations. In Appendix B we derive the evolution equation for
$M^{0}- \bar M^{0}$ system in the Weisskopf-Wigner approximation.
| [
{
"created": "Mon, 18 Jun 2007 22:28:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bilenky",
"S. M.",
""
]
] | Phenomenological issues of the CP violation in the quark sector of the Standard Model are discussed. We consider quark mixing in the SM, standard and Wolfenstein parametrization of the $CKM$ mixing matrix and unitarity triangle. We discuss the phenomenology of the CP violation in $K^{0}_{L}$ and $B_{d}^{0} (\bar B_{d}^{0})$-decays. The standard unitarity triangle fit of the existing data is discussed. In appendix A we compare the $K^{0}\leftrightarrows \bar K^{0}$, $B_{d,s}^{0}\leftrightarrows \bar B^{0}_{d,s}$ etc oscillations with neutrino oscillations. In Appendix B we derive the evolution equation for $M^{0}- \bar M^{0}$ system in the Weisskopf-Wigner approximation. |
hep-ph/0609147 | Jonathan Roberts | S. F. King, J. P. Roberts | Natural Dark Matter | Reference added. Based on talk given at Physics at the LHC 2006,
Cracow, Poland, 3-8 Jul 2006 | ActaPhys.Polon.B38:607-616,2007 | null | null | hep-ph | null | In this talk we analyse the claim that supersymmetry (SUSY) naturally
accounts for the observed dark matter density. In many cases, it is necessary
to tune the parameters of a SUSY model to fit the WMAP data. We provide a
quantitative analysis of the degree of tuning required for different
annihilation channels. Some regions are natural, requiring no tuning at all,
whereas others require tuning at the 0.1% level.
| [
{
"created": "Fri, 15 Sep 2006 12:06:12 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2006 09:00:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"King",
"S. F.",
""
],
[
"Roberts",
"J. P.",
""
]
] | In this talk we analyse the claim that supersymmetry (SUSY) naturally accounts for the observed dark matter density. In many cases, it is necessary to tune the parameters of a SUSY model to fit the WMAP data. We provide a quantitative analysis of the degree of tuning required for different annihilation channels. Some regions are natural, requiring no tuning at all, whereas others require tuning at the 0.1% level. |
1507.08252 | Xiao-Gang He | Guan-Nan Li, Min He, Xiao-Gang He | Some Predictions of Diquark Model for Hidden Charm Pentaquark Discovered
at the LHCb | revtex, 19 pages, 3 figures. one reference added and some typos
corrected | null | 10.1007/JHEP12(2015)128 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHCb has discovered two new states with preferred $J^P$ quantum numbers
$3/2^-$ and $5/2^+$ from $\Lambda_b$ decays. These new states can be
interpreted as hidden charm pentaquarks. It has been argued that the main
features of these pentaquarks can be described by diquark model. The diquark
model predicts that the $3/2^-$ and $5/2^+$ are in two separate octet
multiplets of flavor $SU(3)$ and there is also an additional decuplet
pentaquark multiplet. Finding the states in these multiplets can provide
crucial evidence for this model. The weak decays of b-baryon to a light meson
and a pentaquark can have Cabibbo allowed and suppressed decay channels. We
find that in the $SU(3)$ limit, for $U$-spin related decay modes the ratio of
the decay rates of Cabibbo suppressed to Cabibbo allowed decay channels is
given by $|V_{cd}|^2/|V_{cs}|^2$. There are also other testable relations for
b-baryon weak decays into a pentaquark and a light pseudoscalar. These
relations can be used as tests for the diquark model for pentaquark.
| [
{
"created": "Wed, 29 Jul 2015 18:34:34 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Aug 2015 01:51:12 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Sep 2015 01:54:15 GMT",
"version": "v3"
},
{
"created": "Thu, 8 Oct 2015 15:40:48 GMT",
"version": "v4"
}
] | 2016-01-27 | [
[
"Li",
"Guan-Nan",
""
],
[
"He",
"Min",
""
],
[
"He",
"Xiao-Gang",
""
]
] | The LHCb has discovered two new states with preferred $J^P$ quantum numbers $3/2^-$ and $5/2^+$ from $\Lambda_b$ decays. These new states can be interpreted as hidden charm pentaquarks. It has been argued that the main features of these pentaquarks can be described by diquark model. The diquark model predicts that the $3/2^-$ and $5/2^+$ are in two separate octet multiplets of flavor $SU(3)$ and there is also an additional decuplet pentaquark multiplet. Finding the states in these multiplets can provide crucial evidence for this model. The weak decays of b-baryon to a light meson and a pentaquark can have Cabibbo allowed and suppressed decay channels. We find that in the $SU(3)$ limit, for $U$-spin related decay modes the ratio of the decay rates of Cabibbo suppressed to Cabibbo allowed decay channels is given by $|V_{cd}|^2/|V_{cs}|^2$. There are also other testable relations for b-baryon weak decays into a pentaquark and a light pseudoscalar. These relations can be used as tests for the diquark model for pentaquark. |
0908.1750 | Sheung Tsun Tsou | J. Bordes, H.M. Chan, S.T. Tsou | Possible Anomalies in Higgs Decay: Charm Suppression and
Flavour-Violation | 12 pages, 3 figures | Eur.Phys.J.C65:537-542,2010 | 10.1140/epjc/s10052-009-1186-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is suggested that the Higgs boson may have a branching ratio into the $c
\bar{c}$ mode suppressed by several orders of magnitude compared with
conventional predictions and in addition some small but detectable
flavour-violating modes such as $b \bar{s}$ and $\tau \bar{\mu}$. The
suggestion is based on a scheme proposed and tested earlier for explaining the
mixing pattern and mass hierarchy of fermions in terms of a rotating mass
matrix. If confirmed, the effects would cast new light on the geometric origin
of fermion generations and of the Higgs field itself.
| [
{
"created": "Wed, 12 Aug 2009 16:48:18 GMT",
"version": "v1"
}
] | 2010-02-11 | [
[
"Bordes",
"J.",
""
],
[
"Chan",
"H. M.",
""
],
[
"Tsou",
"S. T.",
""
]
] | It is suggested that the Higgs boson may have a branching ratio into the $c \bar{c}$ mode suppressed by several orders of magnitude compared with conventional predictions and in addition some small but detectable flavour-violating modes such as $b \bar{s}$ and $\tau \bar{\mu}$. The suggestion is based on a scheme proposed and tested earlier for explaining the mixing pattern and mass hierarchy of fermions in terms of a rotating mass matrix. If confirmed, the effects would cast new light on the geometric origin of fermion generations and of the Higgs field itself. |
1907.10698 | Moinul Hossain Rahat | M. Jay P\'erez, Moinul Hossain Rahat, Pierre Ramond, Alexander J.
Stuart, Bin Xu | Stitching an Asymmetric Texture with $\mathcal{T}_{13} \times
\mathcal{Z}_5$ Family Symmetry | Major change from previous version: the symmetry $\mathcal{Z}_4$ has
been changed to $\mathcal{Z}_5$ to prohibit a new unwanted vertex, 26 pages,
version accepted for publication in Physical Review D | Phys. Rev. D 100, 075008 (2019) | 10.1103/PhysRevD.100.075008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose $\mathcal{T}_{13} = \mathcal{Z}_{13} \rtimes \mathcal{Z}_3$ as the
underlying non-Abelian discrete family symmetry of the asymmetric texture
presented in arXiv:1805.10684 [hep-ph]. Its mod 13 arithmetic distinguishes
each Yukawa matrix element of the texture. We construct a model of effective
interactions that singles out the asymmetry and equates, without fine-tuning,
the products of down-quark and charged-lepton masses at a GUT-like scale.
| [
{
"created": "Wed, 24 Jul 2019 20:12:04 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 2019 17:48:33 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Pérez",
"M. Jay",
""
],
[
"Rahat",
"Moinul Hossain",
""
],
[
"Ramond",
"Pierre",
""
],
[
"Stuart",
"Alexander J.",
""
],
[
"Xu",
"Bin",
""
]
] | We propose $\mathcal{T}_{13} = \mathcal{Z}_{13} \rtimes \mathcal{Z}_3$ as the underlying non-Abelian discrete family symmetry of the asymmetric texture presented in arXiv:1805.10684 [hep-ph]. Its mod 13 arithmetic distinguishes each Yukawa matrix element of the texture. We construct a model of effective interactions that singles out the asymmetry and equates, without fine-tuning, the products of down-quark and charged-lepton masses at a GUT-like scale. |
1410.2042 | Shouhua Zhu | Shou-hua Zhu (Peking U) | A New Paradigm: Role of Electron-positron and Hadron Colliders | Invited talk at HF2014, 5 pages | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2012, a light scalar boson (denoted as H(125) in this paper) was
discovered at the LHC. We explore the possible correlation between the
lightness of H(125) and the smallness of CP-violation based on the Lee model,
namely the spontaneous CP-violation two-Higgs-doublet-model. It is a new way to
understand why H(125) is light. Based on this we propose that it is the much
heavier scalar bosons, instead of the H(125), which need to be understood. This
opens a new paradigm that one tries to understand the electro-weak symmetry
breaking and CP violation. For the new paradigm, similar to many other physics
beyond the standard model, one need both electron-positron and higher energy
hadron collider, as well as the low energy experiments, in order to pin down
the whole picture.
| [
{
"created": "Wed, 8 Oct 2014 09:55:31 GMT",
"version": "v1"
}
] | 2014-10-09 | [
[
"Zhu",
"Shou-hua",
"",
"Peking U"
]
] | In 2012, a light scalar boson (denoted as H(125) in this paper) was discovered at the LHC. We explore the possible correlation between the lightness of H(125) and the smallness of CP-violation based on the Lee model, namely the spontaneous CP-violation two-Higgs-doublet-model. It is a new way to understand why H(125) is light. Based on this we propose that it is the much heavier scalar bosons, instead of the H(125), which need to be understood. This opens a new paradigm that one tries to understand the electro-weak symmetry breaking and CP violation. For the new paradigm, similar to many other physics beyond the standard model, one need both electron-positron and higher energy hadron collider, as well as the low energy experiments, in order to pin down the whole picture. |
hep-ph/0401188 | Iain W. Stewart | Christian W. Bauer, Dan Pirjol, Ira Z. Rothstein, Iain W. Stewart | B -> M1 M2: Factorization, Charming Penguins, Strong Phases, and
Polarization | 10 pages, v2 phenomenological analysis of B->pi pi added | Phys.Rev. D70 (2004) 054015 | 10.1103/PhysRevD.70.054015 | MIT-CTP 3469, CMU-HEP-04-01, CALT-68-2475 | hep-ph hep-ex | null | Using the soft-collinear effective theory we derive the factorization theorem
for the decays B-> M1 M2 with M{1,2}= pi,K, rho,K*, at leading order in
Lambda/E_M and Lambda/mb. The results derived here apply even if alpha_s(E_M
Lambda) is not perturbative, and we prove that the physics sensitive to the
E*Lambda scale is the same in B-> M1 M2 and B-> M form factors. We argue that
c-cbar penguins could give long-distance effects at leading order. Decays to
two transversely polarized vector mesons are discussed. Analyzing B-> pi pi we
find predictions for B^0 -> pi^0 pi^0 and |V_{ub}| f_+(0) as a function of
gamma.
| [
{
"created": "Mon, 26 Jan 2004 20:27:26 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jun 2004 04:24:50 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bauer",
"Christian W.",
""
],
[
"Pirjol",
"Dan",
""
],
[
"Rothstein",
"Ira Z.",
""
],
[
"Stewart",
"Iain W.",
""
]
] | Using the soft-collinear effective theory we derive the factorization theorem for the decays B-> M1 M2 with M{1,2}= pi,K, rho,K*, at leading order in Lambda/E_M and Lambda/mb. The results derived here apply even if alpha_s(E_M Lambda) is not perturbative, and we prove that the physics sensitive to the E*Lambda scale is the same in B-> M1 M2 and B-> M form factors. We argue that c-cbar penguins could give long-distance effects at leading order. Decays to two transversely polarized vector mesons are discussed. Analyzing B-> pi pi we find predictions for B^0 -> pi^0 pi^0 and |V_{ub}| f_+(0) as a function of gamma. |
hep-ph/0211339 | Aleksey I. Alekseev | Aleksey I. Alekseev | Strong coupling constant to four loops in the analytic approach to QCD | 30 pages, LATEX, 4 tables, 8 figures | Few Body Syst. 32 (2003) 193-217 | 10.1007/s00601-003-0005-3 | null | hep-ph | null | The QCD analytic running coupling alpha_{an} which has no nonphysical
singularities for all Q^2>0 is considered for the initial perturbation theory
approximations up to four loop order. The finiteness of the analytic coupling
at zero is shown to be a consequence of the asymptotic freedom property of the
initial theory. The nonperturbative contributions to the analytic coupling are
extracted explicitly. For all Q>Lambda they are represented in the form of an
expansion in inverse powers of Euclidean momentum squared. The effective method
for a precise calculation of the analytic running coupling is developed on the
basis of the stated expansion. The energy scale evolution of the analytic
running coupling for the one- to four-loop cases is studied and the higher loop
stability and low dependence on the quark threshold matching conditions in
comparison with the perturbative running coupling were found. Normalizing the
analytic running coupling at the scale of the rest mass of the Z boson with the
world average value of the strong coupling constant,
alpha_{an}(M_Z^2)=0.1181^{+0.002}_{-0.002}, one obtains as a result of the
energy scale evolution of the analytic running coupling alpha_{an}(M_tau^2)=
0.2943^{+0.0111}_{-0.0106} that is notably lower than the estimations of the
coupling strength available at the scale of the mass of the tau lepton.
| [
{
"created": "Thu, 21 Nov 2002 18:35:51 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Alekseev",
"Aleksey I.",
""
]
] | The QCD analytic running coupling alpha_{an} which has no nonphysical singularities for all Q^2>0 is considered for the initial perturbation theory approximations up to four loop order. The finiteness of the analytic coupling at zero is shown to be a consequence of the asymptotic freedom property of the initial theory. The nonperturbative contributions to the analytic coupling are extracted explicitly. For all Q>Lambda they are represented in the form of an expansion in inverse powers of Euclidean momentum squared. The effective method for a precise calculation of the analytic running coupling is developed on the basis of the stated expansion. The energy scale evolution of the analytic running coupling for the one- to four-loop cases is studied and the higher loop stability and low dependence on the quark threshold matching conditions in comparison with the perturbative running coupling were found. Normalizing the analytic running coupling at the scale of the rest mass of the Z boson with the world average value of the strong coupling constant, alpha_{an}(M_Z^2)=0.1181^{+0.002}_{-0.002}, one obtains as a result of the energy scale evolution of the analytic running coupling alpha_{an}(M_tau^2)= 0.2943^{+0.0111}_{-0.0106} that is notably lower than the estimations of the coupling strength available at the scale of the mass of the tau lepton. |
hep-ph/9703369 | Debajyoti Choudhury | Debajyoti Choudhury and Sreerup Raychaudhuri (CERN) | Like-Sign Dileptons at the Fermilab Tevatron Revisited in the Light of
the HERA High-$Q^2$ Anomaly | Minor changes made and references updated | Phys.Rev.D56:1778-1782,1997 | 10.1103/PhysRevD.56.1778 | CERN-TH/97-51 | hep-ph | null | We re-examine like-sign dilepton signals at the Fermilab Tevatron assuming
that the excess high-$Q^2$ events recently seen at HERA are due to scalar
resonances such as squarks of $R$-parity-violating supersymmetry. For gluinos
in the mass range of 200--350 GeV, the like-sign dilepton signal can help to
make the crucial distinction between the most favoured squark explanation and
other proposed solutions.
| [
{
"created": "Wed, 19 Mar 1997 19:06:35 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 1997 15:46:58 GMT",
"version": "v2"
}
] | 2011-08-11 | [
[
"Choudhury",
"Debajyoti",
"",
"CERN"
],
[
"Raychaudhuri",
"Sreerup",
"",
"CERN"
]
] | We re-examine like-sign dilepton signals at the Fermilab Tevatron assuming that the excess high-$Q^2$ events recently seen at HERA are due to scalar resonances such as squarks of $R$-parity-violating supersymmetry. For gluinos in the mass range of 200--350 GeV, the like-sign dilepton signal can help to make the crucial distinction between the most favoured squark explanation and other proposed solutions. |
2209.08100 | Edward D. Ramirez | Edward D. Ramirez, Matthew R. Buckley | Constraining Dark Matter Substructure With Gaia Wide Binaries | 21 pages, 23 figures | null | null | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a catalogue of stellar binaries with wide separations (up to 1 pc)
identified by the Gaia satellite to constrain the presence of extended
substructure within the Milky Way galaxy. Heating of the binaries through
repeated encounters with substructure results in a characteristic distribution
of binary separations, allowing constraints to be placed independent of the
formation mechanism of wide binaries. Across a wide range of subhalo density
profiles, we show that subhalos with masses $\gtrsim 65 \ M_\odot$ and
characteristic length scales similar to the separation of these wide binaries
cannot make up 100% of the Galaxy's dark matter. Constraints weaken for
subhalos with larger length scales and are dependent on their density profiles.
For such large subhalos, higher central densities lead to stronger constraints.
Subhalos with density profiles similar to those expected from cold dark matter
must be at least $\sim 5,000$ times denser than predicted by simulation to be
constrained by the wide binary catalogue.
| [
{
"created": "Fri, 16 Sep 2022 18:00:00 GMT",
"version": "v1"
}
] | 2022-09-20 | [
[
"Ramirez",
"Edward D.",
""
],
[
"Buckley",
"Matthew R.",
""
]
] | We use a catalogue of stellar binaries with wide separations (up to 1 pc) identified by the Gaia satellite to constrain the presence of extended substructure within the Milky Way galaxy. Heating of the binaries through repeated encounters with substructure results in a characteristic distribution of binary separations, allowing constraints to be placed independent of the formation mechanism of wide binaries. Across a wide range of subhalo density profiles, we show that subhalos with masses $\gtrsim 65 \ M_\odot$ and characteristic length scales similar to the separation of these wide binaries cannot make up 100% of the Galaxy's dark matter. Constraints weaken for subhalos with larger length scales and are dependent on their density profiles. For such large subhalos, higher central densities lead to stronger constraints. Subhalos with density profiles similar to those expected from cold dark matter must be at least $\sim 5,000$ times denser than predicted by simulation to be constrained by the wide binary catalogue. |
1806.01129 | Subhaditya Bhattacharya | Basabendu Barman, Subhaditya Bhattacharya and Mohammadreza Zakeri | Multipartite Dark Matter in $SU(2)_N$ extension of Standard Model and
signatures at the LHC | 35 pages, 29 figures and 4 tables, Version published in JCAP | null | 10.1088/1475-7516/2018/09/023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An $SU(2)_N$ extension ($N$ stands for neutral) of the Standard Model (SM) is
proposed with an additional $U(1)=S^{'}$ global symmetry, which stabilizes the
lightest of the vector boson ($X,\bar{X}$) as dark matter (DM) through unbroken
$S=T_{3N}+S^{'}$. The field content of the model is motivated to address
neutrino mass generation, a possible unification to $SU(7)$, along with
spontaneous symmetry breaking of $SU(2)_N$ resulting in massive gauge bosons.
None of the SM particles are charged under $SU(2)_N$ and therefore $X,\bar{X}$
do not have a direct coupling to the visible sector besides a Higgs portal,
which is tiny to avoid any conflict with Higgs data. We show that, a large
kinematic region of this model allows the neutral component of $SU(2)_N$ scalar
triplet and heavy neutrinos introduced here to become additional DM components.
In this paper we explore the viability of such multipartite DM parameter space,
including non-zero DM-DM interactions, to comply with relic density and direct
search constraints. We also demonstrate that the model may yield hadronically
quiet single lepton and two lepton signatures with missing energy at the Large
Hadron Collider (LHC) that can be accessed with high luminosity.
| [
{
"created": "Mon, 4 Jun 2018 14:04:33 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Sep 2018 06:39:36 GMT",
"version": "v2"
}
] | 2018-09-26 | [
[
"Barman",
"Basabendu",
""
],
[
"Bhattacharya",
"Subhaditya",
""
],
[
"Zakeri",
"Mohammadreza",
""
]
] | An $SU(2)_N$ extension ($N$ stands for neutral) of the Standard Model (SM) is proposed with an additional $U(1)=S^{'}$ global symmetry, which stabilizes the lightest of the vector boson ($X,\bar{X}$) as dark matter (DM) through unbroken $S=T_{3N}+S^{'}$. The field content of the model is motivated to address neutrino mass generation, a possible unification to $SU(7)$, along with spontaneous symmetry breaking of $SU(2)_N$ resulting in massive gauge bosons. None of the SM particles are charged under $SU(2)_N$ and therefore $X,\bar{X}$ do not have a direct coupling to the visible sector besides a Higgs portal, which is tiny to avoid any conflict with Higgs data. We show that, a large kinematic region of this model allows the neutral component of $SU(2)_N$ scalar triplet and heavy neutrinos introduced here to become additional DM components. In this paper we explore the viability of such multipartite DM parameter space, including non-zero DM-DM interactions, to comply with relic density and direct search constraints. We also demonstrate that the model may yield hadronically quiet single lepton and two lepton signatures with missing energy at the Large Hadron Collider (LHC) that can be accessed with high luminosity. |
2004.11915 | Jonathan Gaunt | Jonathan R. Gaunt, Maximilian Stahlhofen | The Fully-Differential Gluon Beam Function at NNLO | 21 pages, 0 figures | null | 10.1007/JHEP07(2020)234 | CERN-TH-2020-065, FR-PHENO-2020-003 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fully-differential beam function (dBF) is a universal ingredient in
resummed predictions of hadron collider observables that probe the full
kinematics of the incoming parton from each colliding proton -- the virtuality
and transverse momentum as well as the light-cone momentum fraction $x$. In
this paper we compute the matching coefficients between the unpolarized gluon
dBF and the usual parton distribution functions (PDFs) at the two-loop order.
For observables probing both the virtuality and transverse momentum of incoming
gluons, our results provide the part of the NNLO singular cross section related
to collinear initial-state radiation, and are required for the resummation of
large logarithms through N$^3$LL. Further to this, the dBF is closely linked to
the beam function appearing in a generalized version of threshold
factorization, via a simple integration. By performing this integration for the
two-loop gluon matching coefficients, we also obtain the corresponding
quantities for the generalized threshold beam function.
| [
{
"created": "Fri, 24 Apr 2020 18:00:03 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Gaunt",
"Jonathan R.",
""
],
[
"Stahlhofen",
"Maximilian",
""
]
] | The fully-differential beam function (dBF) is a universal ingredient in resummed predictions of hadron collider observables that probe the full kinematics of the incoming parton from each colliding proton -- the virtuality and transverse momentum as well as the light-cone momentum fraction $x$. In this paper we compute the matching coefficients between the unpolarized gluon dBF and the usual parton distribution functions (PDFs) at the two-loop order. For observables probing both the virtuality and transverse momentum of incoming gluons, our results provide the part of the NNLO singular cross section related to collinear initial-state radiation, and are required for the resummation of large logarithms through N$^3$LL. Further to this, the dBF is closely linked to the beam function appearing in a generalized version of threshold factorization, via a simple integration. By performing this integration for the two-loop gluon matching coefficients, we also obtain the corresponding quantities for the generalized threshold beam function. |
hep-ph/0112122 | Ismd31 | Nu Xu | Recent results from heavy ion collisions | 8 pages, 4 figures (2 in ps, 2 in eps) talk given at XXXI
International Symposium on Multiparticle Dynamics, Sep. 1-7, 2001, Datong
China see http://ismd31.ccnu.edu.cn/ | null | 10.1142/9789812778048_0027 | null | hep-ph | null | Systematic trends of baryon transport, chemical freeze-out, and kinetic
freeze-out in high energy nuclear collisions are presented. Further
measurements of particles with heavy flavors are proposed in order to shed
light on collision dynamics at parton level.
| [
{
"created": "Sat, 8 Dec 2001 04:55:43 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Xu",
"Nu",
""
]
] | Systematic trends of baryon transport, chemical freeze-out, and kinetic freeze-out in high energy nuclear collisions are presented. Further measurements of particles with heavy flavors are proposed in order to shed light on collision dynamics at parton level. |
1905.08577 | Marius H\"ofer | X. Chen, T. Gehrmann, N. Glover, M. H\"ofer, A. Huss | Isolated photon and photon+jet production at NNLO QCD accuracy and the
ratio $R_{13/8}^\gamma$ | 4 pages, 1 figure. Contribution to the 2019 QCD session of the 54th
Rencontres de Moriond | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss different approaches to photon isolation in fixed-order
calculations and present a new next-to-next-to-leading order (NNLO) QCD
calculation of $R_{13/8}^\gamma$, the ratio of the inclusive isolated photon
cross section at 8 TeV and 13 TeV, differential in the photon transverse
momentum, which was recently measured by the ATLAS collaboration.
| [
{
"created": "Tue, 21 May 2019 12:22:48 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Chen",
"X.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"N.",
""
],
[
"Höfer",
"M.",
""
],
[
"Huss",
"A.",
""
]
] | We discuss different approaches to photon isolation in fixed-order calculations and present a new next-to-next-to-leading order (NNLO) QCD calculation of $R_{13/8}^\gamma$, the ratio of the inclusive isolated photon cross section at 8 TeV and 13 TeV, differential in the photon transverse momentum, which was recently measured by the ATLAS collaboration. |
hep-ph/0012015 | Andriy Kostyuk | M.I. Gorenstein, A.P. Kostyuk, H. Stoecker and W. Greiner | Open Charm Enhancement in Pb+Pb Collisions at SPS | 4 pages, Latex | J.Phys. G27 (2001) L47-L52 | 10.1088/0954-3899/27/7/101 | null | hep-ph | null | The statistical coalescence model for the production of open and hidden charm
is considered within the canonical ensemble formulation. The data for the
J/\psi multiplicity in Pb+Pb collisions at 158 A GeV are used for the model
prediction of the open charm yield. We find a strong enhancement of the open
charm production, by a factor of about 2--4, over the standard hard-collision
model extrapolation from nucleon-nucleon to nucleus-nucleus collisions. A
possible mechanism of the open charm enhancement in A+A collisions at the SPS
energies is proposed.
| [
{
"created": "Fri, 1 Dec 2000 19:37:04 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gorenstein",
"M. I.",
""
],
[
"Kostyuk",
"A. P.",
""
],
[
"Stoecker",
"H.",
""
],
[
"Greiner",
"W.",
""
]
] | The statistical coalescence model for the production of open and hidden charm is considered within the canonical ensemble formulation. The data for the J/\psi multiplicity in Pb+Pb collisions at 158 A GeV are used for the model prediction of the open charm yield. We find a strong enhancement of the open charm production, by a factor of about 2--4, over the standard hard-collision model extrapolation from nucleon-nucleon to nucleus-nucleus collisions. A possible mechanism of the open charm enhancement in A+A collisions at the SPS energies is proposed. |
1601.06163 | Cen Zhang | Cen Zhang | Single Top Production at Next-to-Leading Order in the Standard Model
Effective Field Theory | Typos corrected; refs. added | Phys. Rev. Lett. 116, 162002 (2016) | 10.1103/PhysRevLett.116.162002 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Single top production processes at hadron colliders provide information on
the relation between the top quark and the electroweak sector of the standard
model. We compute the next-to-leading order QCD corrections to the three main
production channels: $t$-channel, $s$-channel and $tW$ associated production,
in the standard model including operators up to dimension-six. The calculation
can be matched to parton shower programs and can therefore be directly used in
experimental analyses. The QCD corrections are found to significantly impact
the extraction of the current limits on the operators, because both of an
improved accuracy and a better precision of the theoretical predictions. In
addition, the distributions of some of the key discriminating observables are
modified in a nontrivial way, which could change the interpretation of
measurements in terms of UV complete models.
| [
{
"created": "Fri, 22 Jan 2016 21:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2016 19:04:43 GMT",
"version": "v2"
}
] | 2016-04-27 | [
[
"Zhang",
"Cen",
""
]
] | Single top production processes at hadron colliders provide information on the relation between the top quark and the electroweak sector of the standard model. We compute the next-to-leading order QCD corrections to the three main production channels: $t$-channel, $s$-channel and $tW$ associated production, in the standard model including operators up to dimension-six. The calculation can be matched to parton shower programs and can therefore be directly used in experimental analyses. The QCD corrections are found to significantly impact the extraction of the current limits on the operators, because both of an improved accuracy and a better precision of the theoretical predictions. In addition, the distributions of some of the key discriminating observables are modified in a nontrivial way, which could change the interpretation of measurements in terms of UV complete models. |
2401.06214 | Marco Ardu | Marco Ardu, Sacha Davidson, St\'ephane Lavignac | Constraining New Physics models from $\mu\to e$ observables in bottom-up
EFT | 22 Pages + Appendix, 18 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Upcoming experiments will improve the sensitivity to $\mu\to e$ processes by
several orders of magnitude, and could observe lepton flavour-changing contact
interactions for the first time. In this paper, we investigate what could be
learned about New Physics from the measurements of these $\mu\to e$
observables, using a bottom-up effective field theory (EFT) approach and
focusing on three popular models with new particles around the TeV scale (the
type II seesaw, the inverse seesaw and a scalar leptoquark). We showed in a
previous publication that $\mu\to e$ observables have the ability to rule out
these models because none can fill the whole experimentally accessible
parameter space. In this work, we give more details on our EFT formalism and
present more complete results. We discuss the impact of some observables
complementary to $\mu\to e$ transitions (such as the neutrino mass scale and
ordering, and LFV $\tau$ decays) and draw attention to the interesting
appearance of Jarlskog-like invariants in our expressions for the low-energy
Wilson coefficients.
| [
{
"created": "Thu, 11 Jan 2024 19:00:02 GMT",
"version": "v1"
}
] | 2024-01-15 | [
[
"Ardu",
"Marco",
""
],
[
"Davidson",
"Sacha",
""
],
[
"Lavignac",
"Stéphane",
""
]
] | Upcoming experiments will improve the sensitivity to $\mu\to e$ processes by several orders of magnitude, and could observe lepton flavour-changing contact interactions for the first time. In this paper, we investigate what could be learned about New Physics from the measurements of these $\mu\to e$ observables, using a bottom-up effective field theory (EFT) approach and focusing on three popular models with new particles around the TeV scale (the type II seesaw, the inverse seesaw and a scalar leptoquark). We showed in a previous publication that $\mu\to e$ observables have the ability to rule out these models because none can fill the whole experimentally accessible parameter space. In this work, we give more details on our EFT formalism and present more complete results. We discuss the impact of some observables complementary to $\mu\to e$ transitions (such as the neutrino mass scale and ordering, and LFV $\tau$ decays) and draw attention to the interesting appearance of Jarlskog-like invariants in our expressions for the low-energy Wilson coefficients. |
hep-ph/0508144 | Ramazan Sever | Sameer M. Ikhdair and Ramazan Sever | A Systematic Study on Nonrelativistic Quarkonium Interaction | 24 pages | Int.J.Mod.Phys. A21 (2006) 3989-4002 | 10.1142/S0217751X06030953 | null | hep-ph | null | recently proposed strictly phenomenological static quark-antiquark potential
belonging to the generality $V(r)=-Ar^{-\alpha}+\kappa r^{\beta}+V_{0}$ is
tested with heavy quarkonia in the context of the shifted large N-expansion
method. This nonrelativistic potential model fits the spin-averaged mass
spectra of the $c\bar{c},$ $b\bar{b}$ and $c% \bar{b}$ quarkonia within a few
${\rm MeV}$ and also the five experimentally known leptonic decay widths of the
$c\bar{c}$ and $b% \bar{b}$ vector states. Further, we compute the hyperfine
splittings of the bottomonium spectrum as well as the fine and hyperfine
splittings of the charmonium spectrum. We give predictions for not yet observed
$B_{c}$ splittings. The model is then used to predict the masses of the
remaining quarkonia and the leptonic decay widths of the two pseudoscalar
$c\bar{b%}$ states. Our results are compared with other models to gauge the
reliability of the predictions and point out differences.
| [
{
"created": "Fri, 12 Aug 2005 06:00:48 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ikhdair",
"Sameer M.",
""
],
[
"Sever",
"Ramazan",
""
]
] | recently proposed strictly phenomenological static quark-antiquark potential belonging to the generality $V(r)=-Ar^{-\alpha}+\kappa r^{\beta}+V_{0}$ is tested with heavy quarkonia in the context of the shifted large N-expansion method. This nonrelativistic potential model fits the spin-averaged mass spectra of the $c\bar{c},$ $b\bar{b}$ and $c% \bar{b}$ quarkonia within a few ${\rm MeV}$ and also the five experimentally known leptonic decay widths of the $c\bar{c}$ and $b% \bar{b}$ vector states. Further, we compute the hyperfine splittings of the bottomonium spectrum as well as the fine and hyperfine splittings of the charmonium spectrum. We give predictions for not yet observed $B_{c}$ splittings. The model is then used to predict the masses of the remaining quarkonia and the leptonic decay widths of the two pseudoscalar $c\bar{b%}$ states. Our results are compared with other models to gauge the reliability of the predictions and point out differences. |
2003.03817 | Vladimir Petrov A. | V. V. Ezhela, V. A. Petrov and N. P. Tkachenko | On the $ \rho $ and $ \sigma_{tot} $ measurement by the TOTEM
Collaboration: in the wake of recent discoveries | A small edit of the drawing | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that extraction of the quantities}
$\rho(s)=\mbox{Re}[T_{N}(s,0)]/\mbox{Im}[T_{N}(s,0)]$ {\it and}
$\sigma_{\mbox{tot}}(s)$ {\it from the data on the $pp$ differential
cross-section at $\sqrt{s} = 13$} TeV {\it obtained by the} TOTEM {\it
Collaboration gives results essentially different from those presented in
publication} \cite{Ant} {\it if to use a modified formula for Coulomb-nuclear
interference. The physical interpretation of these data changes accordingly.
| [
{
"created": "Sun, 8 Mar 2020 17:34:50 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2020 09:03:41 GMT",
"version": "v2"
}
] | 2020-03-11 | [
[
"Ezhela",
"V. V.",
""
],
[
"Petrov",
"V. A.",
""
],
[
"Tkachenko",
"N. P.",
""
]
] | We show that extraction of the quantities} $\rho(s)=\mbox{Re}[T_{N}(s,0)]/\mbox{Im}[T_{N}(s,0)]$ {\it and} $\sigma_{\mbox{tot}}(s)$ {\it from the data on the $pp$ differential cross-section at $\sqrt{s} = 13$} TeV {\it obtained by the} TOTEM {\it Collaboration gives results essentially different from those presented in publication} \cite{Ant} {\it if to use a modified formula for Coulomb-nuclear interference. The physical interpretation of these data changes accordingly. |
1708.04012 | Tomasz Skwarnicki | Stephen Lars Olsen, Tomasz Skwarnicki, Daria Zieminska | Non-Standard Heavy Mesons and Baryons, an Experimental Review | null | Rev. Mod. Phys. 90, 15003 (2018) | 10.1103/RevModPhys.90.015003 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Quantum Chromodynamics (QCD), the generally accepted theory for the strong
interactions, describes the interactions between quarks and gluons. The
strongly interacting particles that are seen in nature are hadrons, which are
composites of quarks and gluons. Since QCD is a strongly coupled theory at
distance scales that are characteristic of observable hadrons, there are no
rigorous, first-principle methods to derive the spectrum and properties of the
hadrons from the QCD Lagrangian, except for Lattice QCD simulations that are
not yet able to cope with all aspects of complex and short-lived states.
Instead, a variety of "QCD inspired" phenomenological models have been
proposed. Common features of these models are predictions for the existence of
hadrons with substructures that are more complex than the standard
quark-antiquark mesons and the three quark baryons of the original quark model
that provides a concise description of most of the low-mass hadrons. Recently,
an assortment of candidates for non-standard multi-quark mesons, meson-gluon
hybrids and pentaquark baryons that contain heavy (charm or bottom) quarks have
been discovered. Here we review the experimental evidence for these states and
make some general comparisons of their measured properties with standard
quark-model expectations and predictions of various models for non-standard
hadrons. We conclude that the spectroscopy of all but simplest hadrons is not
yet understood.
| [
{
"created": "Mon, 14 Aug 2017 05:06:19 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Olsen",
"Stephen Lars",
""
],
[
"Skwarnicki",
"Tomasz",
""
],
[
"Zieminska",
"Daria",
""
]
] | Quantum Chromodynamics (QCD), the generally accepted theory for the strong interactions, describes the interactions between quarks and gluons. The strongly interacting particles that are seen in nature are hadrons, which are composites of quarks and gluons. Since QCD is a strongly coupled theory at distance scales that are characteristic of observable hadrons, there are no rigorous, first-principle methods to derive the spectrum and properties of the hadrons from the QCD Lagrangian, except for Lattice QCD simulations that are not yet able to cope with all aspects of complex and short-lived states. Instead, a variety of "QCD inspired" phenomenological models have been proposed. Common features of these models are predictions for the existence of hadrons with substructures that are more complex than the standard quark-antiquark mesons and the three quark baryons of the original quark model that provides a concise description of most of the low-mass hadrons. Recently, an assortment of candidates for non-standard multi-quark mesons, meson-gluon hybrids and pentaquark baryons that contain heavy (charm or bottom) quarks have been discovered. Here we review the experimental evidence for these states and make some general comparisons of their measured properties with standard quark-model expectations and predictions of various models for non-standard hadrons. We conclude that the spectroscopy of all but simplest hadrons is not yet understood. |
1902.01355 | Steven D. Bass | Steven D. Bass | QED and Fundamental Symmetries in Positronium Decays | 15 pages, to appear in Acta Physica Polonica B, based on a lecture
presented at the 3rd Symposium on Positron Emission Tomography, Cracow,
September 10-13 2018 | Acta Phys. Polon. B50 (2019) 1319 | 10.5506/APhysPolB.50.1319 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss positronium decays with emphasis on tests of fundamental
symmetries and the constraints from measurements of other precision observables
involving electrons and photons.
| [
{
"created": "Mon, 4 Feb 2019 18:19:20 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2019 09:36:30 GMT",
"version": "v2"
}
] | 2019-07-12 | [
[
"Bass",
"Steven D.",
""
]
] | We discuss positronium decays with emphasis on tests of fundamental symmetries and the constraints from measurements of other precision observables involving electrons and photons. |
hep-ph/0005134 | Osamu Yasuda | Osamu Yasuda | Phenomenology of Neutrino Oscillations at a Neutrino Factory | 12 pages, 6 sets of figures, uses epsfig. Talk presented at KEK
International Workshop on High Intensity Muon Sources (HIMUS99), to appear in
Proceedings published by World Scientific Publishing Co | null | 10.1142/9789812791849_0009 | TMUP-HEL-0008 | hep-ph | null | It is shown in the three flavor framework that neutrino factories enable us
to measure some of the oscillation parameters, such as the sign of $\Delta
m_{32}^2$, $\theta_{13}$, $\delta$. Some efforts are made to determine the
parameters (the muon energy and the neutrino path length) of a neutrino factory
to optimize the signals.
| [
{
"created": "Mon, 15 May 2000 04:04:34 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Yasuda",
"Osamu",
""
]
] | It is shown in the three flavor framework that neutrino factories enable us to measure some of the oscillation parameters, such as the sign of $\Delta m_{32}^2$, $\theta_{13}$, $\delta$. Some efforts are made to determine the parameters (the muon energy and the neutrino path length) of a neutrino factory to optimize the signals. |
1408.3811 | Eugene Levin | E. Gotsman (Tel AvivU.), E.Levin (Tel Aviv U./UTFSM) and U. Maor (Tel
Aviv U.) | A model for strong interactions at high energy based on the
CGC/saturation approach | 21 pp. 16 figures in eps files | null | 10.1140/epjc/s10052-014-3205-8 | TAUP - 2985/14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present our first attempt to develop a model for soft interactions at high
energy, based on the BFKL Pomeron and the CGC/saturation approach. We construct
an eikonal-type model, whose opacity is determined by the exchange of the
dressed BFKL Pomeron. The Green's function of the Pomeron is calculated in the
framework of the CGC/saturation approach. Using five parameters we achieve a
good description of the experimental data at high energies (
$W\,\geq\,0.546\,TeV$). The model results in different behaviour for the single
and double diffraction cross sections at high energies. The single diffraction
cross section reaches a saturated value (about 10 mb) at high energies, while
the double diffraction cross section continues growing slowly
| [
{
"created": "Sun, 17 Aug 2014 11:13:19 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Aug 2014 08:00:56 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Dec 2014 12:00:11 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Gotsman",
"E.",
"",
"Tel AvivU."
],
[
"Levin",
"E.",
"",
"Tel Aviv U./UTFSM"
],
[
"Maor",
"U.",
"",
"Tel\n Aviv U."
]
] | We present our first attempt to develop a model for soft interactions at high energy, based on the BFKL Pomeron and the CGC/saturation approach. We construct an eikonal-type model, whose opacity is determined by the exchange of the dressed BFKL Pomeron. The Green's function of the Pomeron is calculated in the framework of the CGC/saturation approach. Using five parameters we achieve a good description of the experimental data at high energies ( $W\,\geq\,0.546\,TeV$). The model results in different behaviour for the single and double diffraction cross sections at high energies. The single diffraction cross section reaches a saturated value (about 10 mb) at high energies, while the double diffraction cross section continues growing slowly |
hep-ph/9902438 | K. Sridhar | K. Sridhar (TIFR) | Issues in Quarkonium Production | 9 pages, latex, 2 ps figures. Invited talk presented at the 13th
International Conference on Hadron Collider Physics, Mumbai, India, 14-20
January 1999 | null | null | TIFR/TH/99-09 | hep-ph | null | In this talk, I start with a brief introduction to Non-Relativistic QCD
(NRQCD) and its applications to quarkonium physics. This theory has provided a
consistent framework for the physics of quarkonia, in particular, the
colour-octet Fock components predicted by NRQCD have important implications for
the phenomenology of charmonium production in experiments. The applications of
NRQCD to $J/\psi$ production at Tevatron and the tests of the theory in other
experiments is discussed. In particular, the apparent disagreement of NRQCD
with results from HERA on inelastic photoproduction of $J/\psi$ is discussed
and it is shown that the results are rather susceptible to intrinsic transverse
momentum smearing. The photoproduction data, therefore, do not provide a good
test of NRQCD. It is argued that NRQCD may be tested stringently by looking for
the production of other charmonium resonances at the Tevatron, because the
production rates for these resonances can be predicted within the NRQCD
framework.
| [
{
"created": "Tue, 23 Feb 1999 11:00:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sridhar",
"K.",
"",
"TIFR"
]
] | In this talk, I start with a brief introduction to Non-Relativistic QCD (NRQCD) and its applications to quarkonium physics. This theory has provided a consistent framework for the physics of quarkonia, in particular, the colour-octet Fock components predicted by NRQCD have important implications for the phenomenology of charmonium production in experiments. The applications of NRQCD to $J/\psi$ production at Tevatron and the tests of the theory in other experiments is discussed. In particular, the apparent disagreement of NRQCD with results from HERA on inelastic photoproduction of $J/\psi$ is discussed and it is shown that the results are rather susceptible to intrinsic transverse momentum smearing. The photoproduction data, therefore, do not provide a good test of NRQCD. It is argued that NRQCD may be tested stringently by looking for the production of other charmonium resonances at the Tevatron, because the production rates for these resonances can be predicted within the NRQCD framework. |
hep-ph/9805501 | Nita Sinha | Nita Sinha and Rahul Sinha (Institute of Mathematical Sciences) | CP Violation and Lifetime Differences of Neutral B Mesons from
Correlated B^0-B^0bar Pairs | 11 Pages Revtex | Phys.Rev. D59 (1999) 116001 | 10.1103/PhysRevD.59.116001 | IMSc-98/05/23 | hep-ph | null | We present a technique to determine the CP violating phases, as well as, the
lifetime differences of the mass eigenstates for both $B_d$ and $B_s$, by
considering correlated $B\bar{B}$ pairs produced at the $\Upsilon$ resonances.
We do not require a detailed time dependent study, but only partial time
integrated rates, with the tag time, either preceding or following the decay of
the other $B$ meson to a final state f. f may be a CP eigenstate or a non-CP
eigenstate.
| [
{
"created": "Fri, 29 May 1998 11:26:31 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Sinha",
"Nita",
"",
"Institute of Mathematical Sciences"
],
[
"Sinha",
"Rahul",
"",
"Institute of Mathematical Sciences"
]
] | We present a technique to determine the CP violating phases, as well as, the lifetime differences of the mass eigenstates for both $B_d$ and $B_s$, by considering correlated $B\bar{B}$ pairs produced at the $\Upsilon$ resonances. We do not require a detailed time dependent study, but only partial time integrated rates, with the tag time, either preceding or following the decay of the other $B$ meson to a final state f. f may be a CP eigenstate or a non-CP eigenstate. |
2407.03524 | Vidya Manian | Jairo Orozco Sandoval, Vidya Manian, Sudhir Malik | A multicategory jet image classification framework using deep neural
network | 9 pages, y figures | null | null | null | hep-ph cs.LG | http://creativecommons.org/licenses/by/4.0/ | Jet point cloud images are high dimensional data structures that needs to be
transformed to a separable feature space for machine learning algorithms to
distinguish them with simple decision boundaries. In this article, the authors
focus on jet category separability by particle and jet feature extraction,
resulting in more efficient training of a simple deep neural network, resulting
in a computational efficient interpretable model for jet classification. The
methodology is tested with three to five categories of jets from the JetNet
benchmark jet tagging dataset, resulting in comparable performance to particle
flow network. This work demonstrates that high dimensional datasets represented
in separable latent spaces lead to simpler architectures for jet
classification.
| [
{
"created": "Wed, 3 Jul 2024 22:00:35 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Sandoval",
"Jairo Orozco",
""
],
[
"Manian",
"Vidya",
""
],
[
"Malik",
"Sudhir",
""
]
] | Jet point cloud images are high dimensional data structures that needs to be transformed to a separable feature space for machine learning algorithms to distinguish them with simple decision boundaries. In this article, the authors focus on jet category separability by particle and jet feature extraction, resulting in more efficient training of a simple deep neural network, resulting in a computational efficient interpretable model for jet classification. The methodology is tested with three to five categories of jets from the JetNet benchmark jet tagging dataset, resulting in comparable performance to particle flow network. This work demonstrates that high dimensional datasets represented in separable latent spaces lead to simpler architectures for jet classification. |
hep-ph/0506235 | Gian Paolo Vacca | J. bartels, L.N. Lipatov, M. Salvadore and G.P. Vacca | Deformed Spectral Representation of the BFKL Kernel and the Bootstrap
for Gluon Reggeization | 22 pages, 1 figure | Nucl.Phys. B726 (2005) 53-74 | 10.1016/j.nuclphysb.2005.07.033 | preprint DESY 05-103 | hep-ph hep-th | null | We investigate the space of functions in which the BFKL kernel acts. For the
amplitudes which describe the scattering of colorless projectiles it is
convenient to define, in transverse coordinates, the Moebius space in which the
solutions to the BFKL equation vanish as the coordinates of the two reggeized
gluons coincide. However, in order to fulfill the bootstrap relation for the
BFKL kernel it is necessary to modify the space of functions. We define and
investigate a new space of functions and show explicitly that the bootstrap
relation is valid for the corresponding spectral form of the kernel. We
calculate the generators of the resulting deformed representation of the
sl(2,C) algebra.
| [
{
"created": "Thu, 23 Jun 2005 15:21:41 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"bartels",
"J.",
""
],
[
"Lipatov",
"L. N.",
""
],
[
"Salvadore",
"M.",
""
],
[
"Vacca",
"G. P.",
""
]
] | We investigate the space of functions in which the BFKL kernel acts. For the amplitudes which describe the scattering of colorless projectiles it is convenient to define, in transverse coordinates, the Moebius space in which the solutions to the BFKL equation vanish as the coordinates of the two reggeized gluons coincide. However, in order to fulfill the bootstrap relation for the BFKL kernel it is necessary to modify the space of functions. We define and investigate a new space of functions and show explicitly that the bootstrap relation is valid for the corresponding spectral form of the kernel. We calculate the generators of the resulting deformed representation of the sl(2,C) algebra. |
1803.10247 | Rahul Srivastava | Rahul Srivastava, Christoph A. Ternes, Mariam T\'ortola, Jos\'e W. F.
Valle | Zooming in on neutrino oscillations with DUNE | 20 pages, 8 figures, Published Version | Phys. Rev. D 97, 095025 (2018) | 10.1103/PhysRevD.97.095025 | IFIC/18-xxx | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the capabilities of the DUNE experiment as a probe of the neutrino
mixing paradigm. Taking the current status of neutrino oscillations and the
design specifications of DUNE, we determine the experiment's potential to probe
the structure of neutrino mixing and CP violation. We focus on the poorly
determined parameters $\theta_{23}$ and $\delta_{CP}$ and consider both two and
seven years of run. We take various benchmarks as our true values, such as the
current preferred values of $\theta_{23}$ and $\delta_{CP}$, as well as several
theory-motivated choices. We determine quantitatively DUNE's potential to
perform a precision measurement of $\theta_{23}$, as well as to test the CP
violation hypothesis in a model-independent way. We find that, after running
for seven years, DUNE will make a substantial step in the precise determination
of these parameters, bringing to quantitative test the predictions of various
theories of neutrino mixing.
| [
{
"created": "Tue, 27 Mar 2018 18:00:17 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2018 13:58:31 GMT",
"version": "v2"
}
] | 2018-05-23 | [
[
"Srivastava",
"Rahul",
""
],
[
"Ternes",
"Christoph A.",
""
],
[
"Tórtola",
"Mariam",
""
],
[
"Valle",
"José W. F.",
""
]
] | We examine the capabilities of the DUNE experiment as a probe of the neutrino mixing paradigm. Taking the current status of neutrino oscillations and the design specifications of DUNE, we determine the experiment's potential to probe the structure of neutrino mixing and CP violation. We focus on the poorly determined parameters $\theta_{23}$ and $\delta_{CP}$ and consider both two and seven years of run. We take various benchmarks as our true values, such as the current preferred values of $\theta_{23}$ and $\delta_{CP}$, as well as several theory-motivated choices. We determine quantitatively DUNE's potential to perform a precision measurement of $\theta_{23}$, as well as to test the CP violation hypothesis in a model-independent way. We find that, after running for seven years, DUNE will make a substantial step in the precise determination of these parameters, bringing to quantitative test the predictions of various theories of neutrino mixing. |
1611.00543 | Chuwen Xiao | C. W. Xiao | Investigations of the $D$-multi-$\rho$ interactions | References added; welcome to comment | null | 10.1140/epja/i2017-12366-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, which aims at searching for bound sates, the
interactions of the $D$-multi-$\rho$ systems are investigated by means of the
formalism of the fixed-center-approximation to Faddeev equations. Reproducing
the states of $f_2 (1270)$ and $D_1 (2420)$ dynamically in the two-body
$\rho\rho$ and $\rho D$ interactions, respectively, as the clusters of the
fixed center approximation, the state of $D(3000)^0$ is found as a molecule of
$D-f_2$ or $\rho-D_1$ structures in the three-body interactions, where we
determine its quantum number $J^P = 2^-$ and find another possible state of
$D_2 (3100)$ with isospin $I=3/2$. In our results, there are some other
predictions with uncertainties, a $D_3 (3160)$ state with $I(J^P) = \frac{1}{2}
(3^+)$ in the four-body interactions, a narrow $D_4 (3730)$ state with $I(J^P)
= \frac{1}{2} (4^-)$, a wide $D_4 (3410)$ state of $I(J^P) = \frac{1}{2}
(4^-)$, and another wide $D_4 (3770)$ state but with $I(J^P) = \frac{3}{2}
(4^-)$ in the five-body interactions, and a $D_5 (3570)$ state with $I(J^P) =
\frac{1}{2} (5^+)$ in the six-body interactions. Our results are consistent
with the findings of quark models.
| [
{
"created": "Wed, 2 Nov 2016 10:44:59 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2016 10:41:19 GMT",
"version": "v2"
}
] | 2017-09-20 | [
[
"Xiao",
"C. W.",
""
]
] | In the present work, which aims at searching for bound sates, the interactions of the $D$-multi-$\rho$ systems are investigated by means of the formalism of the fixed-center-approximation to Faddeev equations. Reproducing the states of $f_2 (1270)$ and $D_1 (2420)$ dynamically in the two-body $\rho\rho$ and $\rho D$ interactions, respectively, as the clusters of the fixed center approximation, the state of $D(3000)^0$ is found as a molecule of $D-f_2$ or $\rho-D_1$ structures in the three-body interactions, where we determine its quantum number $J^P = 2^-$ and find another possible state of $D_2 (3100)$ with isospin $I=3/2$. In our results, there are some other predictions with uncertainties, a $D_3 (3160)$ state with $I(J^P) = \frac{1}{2} (3^+)$ in the four-body interactions, a narrow $D_4 (3730)$ state with $I(J^P) = \frac{1}{2} (4^-)$, a wide $D_4 (3410)$ state of $I(J^P) = \frac{1}{2} (4^-)$, and another wide $D_4 (3770)$ state but with $I(J^P) = \frac{3}{2} (4^-)$ in the five-body interactions, and a $D_5 (3570)$ state with $I(J^P) = \frac{1}{2} (5^+)$ in the six-body interactions. Our results are consistent with the findings of quark models. |
1309.1681 | Mikhail Voloshin | Xin Li and M.B.Voloshin | Y(4260) and Y(4360) as mixed hadrocharmonium | 9 pages, 2 figures. Note added including a comparison of our model
with the new BESIII data which became available after the initial version of
our paper | null | 10.1142/S0217732314500606 | FTPI-MINN-13/32, UMN-TH-3303/13 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent BESIII data indicate a significant rate of the process $e^+e^- \to h_c
\pi^+ \pi^-$ at the Y(4260) and Y(4360) resonances, implying a substantial
breaking of the heavy quark spin symmetry. We consider these resonances within
the picture of hadrocharmonium, i.e. of (relatively) compact charmonium
embedded in a light quark mesonic excitation. We suggest that the resonances
Y(4260) and Y(4360) are a mixture, with mixing close to maximal, of two states
of hadrochamonium, one containing a spin-triplet $c \bar c$ pair and the other
containing a spin-singlet heavy quark pair. We argue that this model is in a
reasonable agreement with the available data and produces distinctive and
verifiable predictions for the energy dependence of the production rate in
$e^+e^-$ annihilation of the final states $J/\psi \pi \pi$, $\psi' \pi \pi$ and
$h_c \pi \pi$, including the pattern of interference between the two
resonances.
| [
{
"created": "Fri, 6 Sep 2013 15:49:29 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Sep 2013 17:39:56 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Feb 2014 18:28:15 GMT",
"version": "v3"
}
] | 2015-06-17 | [
[
"Li",
"Xin",
""
],
[
"Voloshin",
"M. B.",
""
]
] | Recent BESIII data indicate a significant rate of the process $e^+e^- \to h_c \pi^+ \pi^-$ at the Y(4260) and Y(4360) resonances, implying a substantial breaking of the heavy quark spin symmetry. We consider these resonances within the picture of hadrocharmonium, i.e. of (relatively) compact charmonium embedded in a light quark mesonic excitation. We suggest that the resonances Y(4260) and Y(4360) are a mixture, with mixing close to maximal, of two states of hadrochamonium, one containing a spin-triplet $c \bar c$ pair and the other containing a spin-singlet heavy quark pair. We argue that this model is in a reasonable agreement with the available data and produces distinctive and verifiable predictions for the energy dependence of the production rate in $e^+e^-$ annihilation of the final states $J/\psi \pi \pi$, $\psi' \pi \pi$ and $h_c \pi \pi$, including the pattern of interference between the two resonances. |
1407.4101 | Katarzyna Krajewska | K. Krajewska, J. Z. Kami\'nski | Coherent combs of anti-matter from nonlinear electron-positron pair
creation | 9 pages, 5 figures | Phys. Rev. A 90, 052108 (2014) | 10.1103/PhysRevA.90.052108 | null | hep-ph physics.acc-ph physics.atom-ph physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electron-positron pair creation in collisions of a modulated laser pulse with
a high-energy photon (nonlinear Breit-Wheeler process) is studied by means of
strong-field quantum electrodynamics. It is shown that the driving pulse
modulations lead to appearance of comb structures in the energy spectra of
produced positrons (electrons). It is demonstrated that these combs result from
a coherent enhancement of probability amplitudes of pair creation from
different modulations of the laser pulse. Thus, resembling the Young-double
slit experiment for anti-matter (matter) waves.
| [
{
"created": "Tue, 15 Jul 2014 19:31:07 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Krajewska",
"K.",
""
],
[
"Kamiński",
"J. Z.",
""
]
] | Electron-positron pair creation in collisions of a modulated laser pulse with a high-energy photon (nonlinear Breit-Wheeler process) is studied by means of strong-field quantum electrodynamics. It is shown that the driving pulse modulations lead to appearance of comb structures in the energy spectra of produced positrons (electrons). It is demonstrated that these combs result from a coherent enhancement of probability amplitudes of pair creation from different modulations of the laser pulse. Thus, resembling the Young-double slit experiment for anti-matter (matter) waves. |
2401.01323 | Ren-You Zhang | Zhe Li, Ren-You Zhang, Shu-Xiang Li, Xiao-Feng Wang, Wen-Jie He, Liang
Han, Yi Jiang, Qing-hai Wang | Mixed QCD-EW corrections to $W$-pair production at electron-positron
colliders | 32 pages, 9 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discrepancy between the CDF measurement and the Standard Model
theoretical prediction for the $W$-boson mass underscores the importance of
conducting high-precision studies on the $W$ boson, which is one of the
predominant objectives of proposed future $e^+e^-$ colliders. We investigate in
detail the production of $W$-boson pairs at $e^+e^-$ colliders, and compute the
next-to-next-to-leading order mixed QCD-EW corrections to both the integrated
cross section and various kinematic distributions. By employing the method of
differential equations, we analytically calculate the two-loop master integrals
for the mixed QCD-EW virtual corrections to $e^+e^- \rightarrow W^+W^-$.
Utilizing the Magnus transformation, we derive a set of canonical master
integrals for each integral family. This canonical basis satisfies a system of
differential equations in which the dependence on the dimensional regulator is
linearly factorized from the kinematics. We then express all these canonical
master integrals as Taylor series in $\epsilon$ up to $\epsilon^4$, with
coefficients articulated in terms of Goncharov polylogarithms up to weight
four. Upon applying our analytic expressions of these master integrals to the
phenomenological analysis of $W$-pair production, we observe that the
$\mathcal{O}(\alpha\alpha_s)$ corrections are significantly impactful in the
$\alpha(0)$ scheme, particularly in certain phase-space regions. However, these
mixed QCD-EW corrections can be heavily suppressed by adopting the $G_{\mu}$
scheme.
| [
{
"created": "Tue, 2 Jan 2024 18:26:30 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2024 14:11:01 GMT",
"version": "v2"
}
] | 2024-07-17 | [
[
"Li",
"Zhe",
""
],
[
"Zhang",
"Ren-You",
""
],
[
"Li",
"Shu-Xiang",
""
],
[
"Wang",
"Xiao-Feng",
""
],
[
"He",
"Wen-Jie",
""
],
[
"Han",
"Liang",
""
],
[
"Jiang",
"Yi",
""
],
[
"Wang",
"Qing-hai",
""
]
] | The discrepancy between the CDF measurement and the Standard Model theoretical prediction for the $W$-boson mass underscores the importance of conducting high-precision studies on the $W$ boson, which is one of the predominant objectives of proposed future $e^+e^-$ colliders. We investigate in detail the production of $W$-boson pairs at $e^+e^-$ colliders, and compute the next-to-next-to-leading order mixed QCD-EW corrections to both the integrated cross section and various kinematic distributions. By employing the method of differential equations, we analytically calculate the two-loop master integrals for the mixed QCD-EW virtual corrections to $e^+e^- \rightarrow W^+W^-$. Utilizing the Magnus transformation, we derive a set of canonical master integrals for each integral family. This canonical basis satisfies a system of differential equations in which the dependence on the dimensional regulator is linearly factorized from the kinematics. We then express all these canonical master integrals as Taylor series in $\epsilon$ up to $\epsilon^4$, with coefficients articulated in terms of Goncharov polylogarithms up to weight four. Upon applying our analytic expressions of these master integrals to the phenomenological analysis of $W$-pair production, we observe that the $\mathcal{O}(\alpha\alpha_s)$ corrections are significantly impactful in the $\alpha(0)$ scheme, particularly in certain phase-space regions. However, these mixed QCD-EW corrections can be heavily suppressed by adopting the $G_{\mu}$ scheme. |
hep-ph/9403214 | null | D.A. Morris and A. Ringwald | Astrophysical Searches For Exotic Phenomena In Ultrahigh Energy
Neutrino-Nucleon Scattering | Invited talk presented by A. Ringwald at the 3rd NESTOR International
Conference, 19-21 October 1993, Pylos, Greece. 24 pages, LaTeX, 10 figures
appended as uu-encoded file. DESY 94-026, UCLA/94/TEP/9 | null | null | null | hep-ph | null | We investigate the potential of near-future neutrino telescopes like NESTOR
for searches for exotic processes in ultrahigh energy neutrino-quark
scattering. (NESTOR is the acronym for NEutrinos, from Supernovae and TeV
sources, Ocean Range ... a water Cherenkov detector to be constructed in the
Mediterranean off the coast of Greece). We consider signatures such as muon
bundles and/or contained cascades from the nonperturbative production of
multiple weak gauge bosons in the Standard Model, compositeness and leptoquark
production.
| [
{
"created": "Wed, 2 Mar 1994 22:17:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Morris",
"D. A.",
""
],
[
"Ringwald",
"A.",
""
]
] | We investigate the potential of near-future neutrino telescopes like NESTOR for searches for exotic processes in ultrahigh energy neutrino-quark scattering. (NESTOR is the acronym for NEutrinos, from Supernovae and TeV sources, Ocean Range ... a water Cherenkov detector to be constructed in the Mediterranean off the coast of Greece). We consider signatures such as muon bundles and/or contained cascades from the nonperturbative production of multiple weak gauge bosons in the Standard Model, compositeness and leptoquark production. |
1112.5108 | Renata Zukanovich Funchal | O. J. P. Eboli (Sao Paulo U.), C. A. Savoy (Saclay, SPhT), R.
Zukanovich Funchal (Sao Paulo, U.) | A Rationale for Long-lived Quarks and Leptons at the LHC: Low Energy
Flavour Theory | 10 pages, 1 figure | null | 10.1007/JHEP02(2012)123 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of gauged flavour symmetries, new fermions in parity
symmetric representations of the standard model are generically needed for the
compensation of mixed anomalies. The key point is that their masses are also
protected by flavour symmetries and some of them are expected to lie way below
the flavour symmetry breaking scale(s), which has to occur many orders of
magnitude above the electroweak scale to be compatible with the available data
from flavour changing neutral currents and CP violation experiments. We argue
that, actually, some of these fermions would plausibly get masses within the
LHC range. If they are taken to be heavy quarks and leptons, in
(bi)-fundamental representations of the standard model symmetries, their
mixings with the light ones are strongly constrained to be very small by
electroweak precision data. The alternative chosen here is to exactly forbid
such mixings by breaking of flavour symmetries into an exact discrete symmetry,
the so-called proton-hexality, primarily suggested to avoid proton decay. As a
consequence of the large value needed for the flavour breaking scale, those
heavy particles are long-lived and rather appropriate for the current and
future searches at the LHC for quasi-stable hadrons and leptons. In fact, the
LHC experiments have already started to look for them.
| [
{
"created": "Wed, 21 Dec 2011 17:40:04 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Eboli",
"O. J. P.",
"",
"Sao Paulo U."
],
[
"Savoy",
"C. A.",
"",
"Saclay, SPhT"
],
[
"Funchal",
"R. Zukanovich",
"",
"Sao Paulo, U."
]
] | In the framework of gauged flavour symmetries, new fermions in parity symmetric representations of the standard model are generically needed for the compensation of mixed anomalies. The key point is that their masses are also protected by flavour symmetries and some of them are expected to lie way below the flavour symmetry breaking scale(s), which has to occur many orders of magnitude above the electroweak scale to be compatible with the available data from flavour changing neutral currents and CP violation experiments. We argue that, actually, some of these fermions would plausibly get masses within the LHC range. If they are taken to be heavy quarks and leptons, in (bi)-fundamental representations of the standard model symmetries, their mixings with the light ones are strongly constrained to be very small by electroweak precision data. The alternative chosen here is to exactly forbid such mixings by breaking of flavour symmetries into an exact discrete symmetry, the so-called proton-hexality, primarily suggested to avoid proton decay. As a consequence of the large value needed for the flavour breaking scale, those heavy particles are long-lived and rather appropriate for the current and future searches at the LHC for quasi-stable hadrons and leptons. In fact, the LHC experiments have already started to look for them. |
2403.20017 | Nanako Kato | Nanako Kato, Luca Maxia, Cristian Pisano | Spin asymmetries for $C$-even quarkonium production as a probe of gluon
distributions | 14 pages, 5 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Within the framework of transverse momentum dependent factorization in
combination with nonrelativistic QCD, we study charmonium and bottomonium
production in hadronic collisions. We focus on quarkonium states with even
charge conjugation, for which the color-singlet production mechanism is
expected to be also dominant in the small transverse momentum region, $q_T^2
\ll 4 M_{c,b}^2$. It is shown that the distributions of linearly polarized
gluons inside unpolarized, longitudinally and transversely polarized protons
contribute to the cross sections for scalar and pseudoscalar quarkonia in a
very distinctive, parity-dependent way, whereas their effects on higher angular
momentum states are strongly suppressed. We derive analytical expressions for
single and double spin asymmetries, which would allow for the direct extraction
of the gluon transverse momentum dependent distributions, mirroring the
phenomenological studies of the Drell-Yan processes aimed at the extraction of
their quark counterparts. By adopting Gaussian models for the gluon TMDs, which
fulfill without saturating everywhere their positivity bounds, we provide
numerical predictions for the transverse single-spin asymmetries. These
observables could be measured at LHCSpin, the fixed target experiment planned
at the LHC.
| [
{
"created": "Fri, 29 Mar 2024 07:05:21 GMT",
"version": "v1"
}
] | 2024-04-01 | [
[
"Kato",
"Nanako",
""
],
[
"Maxia",
"Luca",
""
],
[
"Pisano",
"Cristian",
""
]
] | Within the framework of transverse momentum dependent factorization in combination with nonrelativistic QCD, we study charmonium and bottomonium production in hadronic collisions. We focus on quarkonium states with even charge conjugation, for which the color-singlet production mechanism is expected to be also dominant in the small transverse momentum region, $q_T^2 \ll 4 M_{c,b}^2$. It is shown that the distributions of linearly polarized gluons inside unpolarized, longitudinally and transversely polarized protons contribute to the cross sections for scalar and pseudoscalar quarkonia in a very distinctive, parity-dependent way, whereas their effects on higher angular momentum states are strongly suppressed. We derive analytical expressions for single and double spin asymmetries, which would allow for the direct extraction of the gluon transverse momentum dependent distributions, mirroring the phenomenological studies of the Drell-Yan processes aimed at the extraction of their quark counterparts. By adopting Gaussian models for the gluon TMDs, which fulfill without saturating everywhere their positivity bounds, we provide numerical predictions for the transverse single-spin asymmetries. These observables could be measured at LHCSpin, the fixed target experiment planned at the LHC. |
hep-ph/9409253 | null | Ina Sarcevic | Charm Production at RHIC and LHC to $O(\alpha_{s}^3)$ | Presented at Annual Meeting of Division of Particles and Fields of
the APS (DPF'94), Albuquerque, NM, August 2-6, 1994; University of Arizona
preprint, Latex, 6 pages, 4 figs.(not included, (available upon request),
AZPH-TH/94-21 | Phys. Lett. B338 (1994) 426 | null | null | hep-ph | null | We present results on rapidity and transverse momentum distributions of
inclusive charm quark production in hadronic and heavy-ion collisions at RHIC
and LHC energies, including the next-to-leading order, $O(\alpha_s^3)$,
radiative corrections and the nuclear shadowing effect. We determine hadronic
and nuclear K-factor for the differential and total inclusive cross sections
for the charm production. We discuss theoretical uncertainties inherent in our
calculation. In particular, we find that different extrapolations of gluon
density to low-$x$ region introduce large theoretical uncertainty in the
calculation of charm production at LHC energies. Finally, we comment on the
possibility of detecting the quark-gluon plasma signal as an enhanced charm
production in heavy-ion collisions at RHIC.
| [
{
"created": "Wed, 7 Sep 1994 22:06:32 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Sarcevic",
"Ina",
""
]
] | We present results on rapidity and transverse momentum distributions of inclusive charm quark production in hadronic and heavy-ion collisions at RHIC and LHC energies, including the next-to-leading order, $O(\alpha_s^3)$, radiative corrections and the nuclear shadowing effect. We determine hadronic and nuclear K-factor for the differential and total inclusive cross sections for the charm production. We discuss theoretical uncertainties inherent in our calculation. In particular, we find that different extrapolations of gluon density to low-$x$ region introduce large theoretical uncertainty in the calculation of charm production at LHC energies. Finally, we comment on the possibility of detecting the quark-gluon plasma signal as an enhanced charm production in heavy-ion collisions at RHIC. |
hep-ph/9302252 | Gye Park | T.K. Kuo, Gye T. Park, and M. Zralek | Boson Pair Productions In $e^+$ $e^-$ Annihilation | 10 pages, LaTeX, 3 figs not included, CTP-TAMU-08/93, PURD-TH-93-1 | NuovoCim.A107:757-764,1994 | 10.1007/BF02732083 | null | hep-ph | null | We examine the processes $e^+ e^-\longrightarrow W^+ W^-$ and $Z^0 Z^0$ in
the context of the $SP(6)_L\otimes U(1)_Y$ model. We find that there are
significant deviations in the total cross sections $\sigma (s)$ from the
standard model results due to the presence of additional gauge bosons
$Z^\prime$ and $W^\prime$ in the model. These deviations could be detected at
LEP.
| [
{
"created": "Thu, 11 Feb 1993 19:37:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kuo",
"T. K.",
""
],
[
"Park",
"Gye T.",
""
],
[
"Zralek",
"M.",
""
]
] | We examine the processes $e^+ e^-\longrightarrow W^+ W^-$ and $Z^0 Z^0$ in the context of the $SP(6)_L\otimes U(1)_Y$ model. We find that there are significant deviations in the total cross sections $\sigma (s)$ from the standard model results due to the presence of additional gauge bosons $Z^\prime$ and $W^\prime$ in the model. These deviations could be detected at LEP. |
hep-ph/0010187 | Jochum van der Bij | R. Akhoury, J.J. van der Bij, H. Wang | Interplay between perturbative and non-perturbative effects in the
stealthy Higgs model | 31 pages, Latex, 11 figures | Eur.Phys.J.C20:497-505,2001 | 10.1007/s100520100680 | UM-TH-00-14, Freiburg-THEP-00/15 | hep-ph | null | We study corrections to electroweak precision variables in a model with
strongly interacting singlet Higgs particles.
| [
{
"created": "Tue, 17 Oct 2000 14:29:02 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Akhoury",
"R.",
""
],
[
"van der Bij",
"J. J.",
""
],
[
"Wang",
"H.",
""
]
] | We study corrections to electroweak precision variables in a model with strongly interacting singlet Higgs particles. |
0804.3409 | Samoil Bilenky M. | S. M. Bilenky, F. von Feilitzsch and W. Potzel | Different Schemes of Neutrino Oscillations in M\"Ossbauer Neutrino
Experiment | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We comment on the paper "On application of the time-energy uncertainty
relation to M\"ossbauer neutrino experiments" (see arXiv: 0803.1424) in which
our paper "Time-energy uncertainty relations for neutrino oscillation and
M\"ossbauer neutrino experiment" (see arXiv: 0803.0527) has been criticized. We
argue that this critique is a result of misinterpretation: The authors of
(arXiv: 0803.1424) do not take into account (or do not accept) the fact that at
present there exist different schemes of neutrino oscillations which can not be
distinguished in usual neutrino oscillation experiments. We stress that a
recently proposed M\"ossbauer neutrino experiment provides the unique
possibility to discriminate basically different approaches to oscillations of
flavor neutrinos.
| [
{
"created": "Mon, 21 Apr 2008 20:51:15 GMT",
"version": "v1"
}
] | 2008-04-23 | [
[
"Bilenky",
"S. M.",
""
],
[
"von Feilitzsch",
"F.",
""
],
[
"Potzel",
"W.",
""
]
] | We comment on the paper "On application of the time-energy uncertainty relation to M\"ossbauer neutrino experiments" (see arXiv: 0803.1424) in which our paper "Time-energy uncertainty relations for neutrino oscillation and M\"ossbauer neutrino experiment" (see arXiv: 0803.0527) has been criticized. We argue that this critique is a result of misinterpretation: The authors of (arXiv: 0803.1424) do not take into account (or do not accept) the fact that at present there exist different schemes of neutrino oscillations which can not be distinguished in usual neutrino oscillation experiments. We stress that a recently proposed M\"ossbauer neutrino experiment provides the unique possibility to discriminate basically different approaches to oscillations of flavor neutrinos. |
0902.1316 | Adam Szczepaniak | Peng Guo and Adam P. Szczepaniak | Chiral symmetry restoration and deconfinement in Coulomb Gauge QCD | 7 pages, 8 figures | Phys.Rev.D79:116006,2009 | 10.1103/PhysRevD.79.116006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of Coulomb Gauge QCD we explore dynamical breaking of chiral
symmetry and screening of the confinement potential at finite density. The
screened potential is applied in study of charmonium dissociation.
| [
{
"created": "Sun, 8 Feb 2009 15:49:01 GMT",
"version": "v1"
}
] | 2010-04-23 | [
[
"Guo",
"Peng",
""
],
[
"Szczepaniak",
"Adam P.",
""
]
] | In the framework of Coulomb Gauge QCD we explore dynamical breaking of chiral symmetry and screening of the confinement potential at finite density. The screened potential is applied in study of charmonium dissociation. |
2401.04681 | Shuai Zhao | Jian-Ping Dai, Shuai Zhao | Production of true para-muonium in linearly polarized photon fusions | 7 pages, 10 figures, 1 table. Accepted for publication in Physical
Review D | Phys. Rev. D 109, 054022 (2024) | 10.1103/PhysRevD.109.054022 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | True muonium (TM) -- the bound state of $\mu^+\mu^-$ -- has not been
discovered yet. It was demonstrated that searching for TM via $\gamma\gamma$
fusions in heavy ion collisions is feasible due to the enhancement of the atom
number. We study the production of the true para-muonium (pTM) in the
collisions of linearly polarized photons in the experiments of heavy-ion
collisions, calculate the production rate as well as the transverse spectrum of
pTM, and explore the discovery potential in nuclear experiments. Our results
show that there is a significant correlation between the linearly polarized
photon distribution and the transverse momentum distribution of pTM. The
optimal kinematic region of the generated pTM is identified, which can provide
a theoretical guide to the detection of pTM in experiments.
| [
{
"created": "Tue, 9 Jan 2024 17:14:11 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Mar 2024 15:11:02 GMT",
"version": "v2"
}
] | 2024-03-14 | [
[
"Dai",
"Jian-Ping",
""
],
[
"Zhao",
"Shuai",
""
]
] | True muonium (TM) -- the bound state of $\mu^+\mu^-$ -- has not been discovered yet. It was demonstrated that searching for TM via $\gamma\gamma$ fusions in heavy ion collisions is feasible due to the enhancement of the atom number. We study the production of the true para-muonium (pTM) in the collisions of linearly polarized photons in the experiments of heavy-ion collisions, calculate the production rate as well as the transverse spectrum of pTM, and explore the discovery potential in nuclear experiments. Our results show that there is a significant correlation between the linearly polarized photon distribution and the transverse momentum distribution of pTM. The optimal kinematic region of the generated pTM is identified, which can provide a theoretical guide to the detection of pTM in experiments. |
hep-ph/0103025 | Ivan Dadic | I. Dadic | Pinching phenomenon: Central feature in out of equilibrium thermal field
theories | 18 pages, 1 Postscript figure, Latex | null | null | BI-TP 2000/14, IRB-TH-5/00 | hep-ph | null | We continue to study out of equilibrium TFT with switching on the interaction
occurring at finite time. We exploit the concept of projected function (PF) and
Wigner transform of projected function (WTPF). WTPF's are bare propagators,
one-loop self-energies, retarded and advanced components of the resummed
propagator. Among WTPF's convolution product is very simple, one does not need
gradient expansion. However, WTPF's are completely determined by their infinite
time limit and, thus, cannot be the carriers of relaxation phenomena.
Furthermore, we observe that the functions capable of carrying relaxation
phenomena (non-WTPF) emerge in the mixed ("ill-defined") products of retarded
and advanced propagators and self-energies. In particular, only non-WTPF's
contribute to time variation of equal-time Green functions (particle number,
etc.); contributions from WTPF will be constant in time. As these are generated
in mixed products, the pinching phenomenon is being promoted from an obstacle
to the central feature of out of equilibrium TFT. We analyze the pinching
phenomenon. In the case of naive pinching we reproduce known results. In
Schwinger-Dyson equations the Keldysh component of self-energy is well defined
even for multiple self-energy insertion contributions. We calaculate explicitly
single self-energy contribution to Keldysh component of propagator which
generates nontrivial time dependence. For photon production from QCD plasma
(finite-lifetime effect) our approximate analytic results agree with the
results by S. -Y. Wang and D. Boyanovsky obtained within dynamical
renormalisation group approach.
| [
{
"created": "Fri, 2 Mar 2001 14:11:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadic",
"I.",
""
]
] | We continue to study out of equilibrium TFT with switching on the interaction occurring at finite time. We exploit the concept of projected function (PF) and Wigner transform of projected function (WTPF). WTPF's are bare propagators, one-loop self-energies, retarded and advanced components of the resummed propagator. Among WTPF's convolution product is very simple, one does not need gradient expansion. However, WTPF's are completely determined by their infinite time limit and, thus, cannot be the carriers of relaxation phenomena. Furthermore, we observe that the functions capable of carrying relaxation phenomena (non-WTPF) emerge in the mixed ("ill-defined") products of retarded and advanced propagators and self-energies. In particular, only non-WTPF's contribute to time variation of equal-time Green functions (particle number, etc.); contributions from WTPF will be constant in time. As these are generated in mixed products, the pinching phenomenon is being promoted from an obstacle to the central feature of out of equilibrium TFT. We analyze the pinching phenomenon. In the case of naive pinching we reproduce known results. In Schwinger-Dyson equations the Keldysh component of self-energy is well defined even for multiple self-energy insertion contributions. We calaculate explicitly single self-energy contribution to Keldysh component of propagator which generates nontrivial time dependence. For photon production from QCD plasma (finite-lifetime effect) our approximate analytic results agree with the results by S. -Y. Wang and D. Boyanovsky obtained within dynamical renormalisation group approach. |
hep-ph/9508345 | Lu Cai-dian | Cai-Dian Lu | $b\to s \gamma$ Decay in the Two Higgs Doublet Model | 3 pages (no figure). Talk given at the first International Conference
on Fronties of Physics, Shantou, China. To appear in the proceedings, World
Scientific, Singapore | null | null | As-ITP 95-25 | hep-ph | null | QCD corrections to $b \to s \gamma$ decay in the two Higgs doublet model are
calculated from the energy scale of top quark to that of bottom. The
constraints on the two Higgs doublet model from the new experimental bounds of
$b\to s\gamma$ by CLEO and the latest top quark mass by CDF and D0 are
reanalyzed. It shows that the constraints become more stringent than that of
the earlier analysis, i.e. a bigger region of the parameter space of the model
is ruled out.
| [
{
"created": "Tue, 22 Aug 1995 14:04:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lu",
"Cai-Dian",
""
]
] | QCD corrections to $b \to s \gamma$ decay in the two Higgs doublet model are calculated from the energy scale of top quark to that of bottom. The constraints on the two Higgs doublet model from the new experimental bounds of $b\to s\gamma$ by CLEO and the latest top quark mass by CDF and D0 are reanalyzed. It shows that the constraints become more stringent than that of the earlier analysis, i.e. a bigger region of the parameter space of the model is ruled out. |
1805.00070 | Jilberto Zamora-Sa\'a | Gorazd Cvetic, Arindam Das, Jilberto Zamora-Saa | Probing heavy neutrino oscillations in rare W boson decays | Accepted Manuscript | Journal of Physics G: Nuclear and Particle Physics, Volume 46,
Number 7 (2019) | 10.1088/1361-6471/ab1212 | 0954-3899; 1361-6471 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the lepton number violating W boson and top quark
decays via intermediate on-shell Majorana neutrinos Nj into three charged
leptons and a light neutrino. We discuss the neutrino oscillation effects
present in the decay due to the small mass gap between the heavy neutrino
states. We focus on a scenario that contains at least two heavy Majorana
neutrinos in the mass range 2-80 GeV. The results indicate that the modulation
of the branching ratios as a function of the distance between the vertices may
be detected in a future experiment such as High-Luminosity Large Hadron
Collider. As a secondary result, the CP-violating phases could be explored.
| [
{
"created": "Mon, 30 Apr 2018 19:27:28 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2019 23:45:45 GMT",
"version": "v2"
}
] | 2019-05-17 | [
[
"Cvetic",
"Gorazd",
""
],
[
"Das",
"Arindam",
""
],
[
"Zamora-Saa",
"Jilberto",
""
]
] | In this work, we study the lepton number violating W boson and top quark decays via intermediate on-shell Majorana neutrinos Nj into three charged leptons and a light neutrino. We discuss the neutrino oscillation effects present in the decay due to the small mass gap between the heavy neutrino states. We focus on a scenario that contains at least two heavy Majorana neutrinos in the mass range 2-80 GeV. The results indicate that the modulation of the branching ratios as a function of the distance between the vertices may be detected in a future experiment such as High-Luminosity Large Hadron Collider. As a secondary result, the CP-violating phases could be explored. |
1208.5508 | A. Tureanu | Masud Chaichian, Kazuo Fujikawa and Anca Tureanu | On neutrino masses via CPT violating Higgs interaction in the Standard
Model | 8 pages | null | 10.1016/j.physletb.2012.09.071 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lorentz invariant $CPT$ violation by using non-local interactions is
naturally incorporated in the Higgs coupling to neutrinos in the Standard
Model, without spoiling the basic $SU(2)_{L}\times U(1)$ gauge symmetry. The
neutrino--antineutrino mass splitting is thus realized by the mechanism which
was proposed recently, assuming the neutrino masses to be predominantly
Dirac-type in the Standard Model.
| [
{
"created": "Mon, 27 Aug 2012 21:16:27 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Chaichian",
"Masud",
""
],
[
"Fujikawa",
"Kazuo",
""
],
[
"Tureanu",
"Anca",
""
]
] | The Lorentz invariant $CPT$ violation by using non-local interactions is naturally incorporated in the Higgs coupling to neutrinos in the Standard Model, without spoiling the basic $SU(2)_{L}\times U(1)$ gauge symmetry. The neutrino--antineutrino mass splitting is thus realized by the mechanism which was proposed recently, assuming the neutrino masses to be predominantly Dirac-type in the Standard Model. |
0911.1086 | Philippe Brax | Philippe Brax, Carsten van de Bruck, Anne-Christine Davis and Douglas
Shaw | Laboratory Tests of Chameleon Models | Contribution to the "5th Patras Workshop on Axions, WIMPs and WISPs",
Durham 13-17 July 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a cursory overview of chameleon models of dark energy and their
laboratory tests with an emphasis on optical and Casimir experiments. Optical
experiments measuring the ellipticity of an initially polarised laser beam are
sensitive to the coupling of chameleons to photons. The next generation of
Casimir experiments may be able to unravel the nature of the scalar force
mediated by the chameleon between parallel plates.
| [
{
"created": "Thu, 5 Nov 2009 17:33:16 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Brax",
"Philippe",
""
],
[
"van de Bruck",
"Carsten",
""
],
[
"Davis",
"Anne-Christine",
""
],
[
"Shaw",
"Douglas",
""
]
] | We present a cursory overview of chameleon models of dark energy and their laboratory tests with an emphasis on optical and Casimir experiments. Optical experiments measuring the ellipticity of an initially polarised laser beam are sensitive to the coupling of chameleons to photons. The next generation of Casimir experiments may be able to unravel the nature of the scalar force mediated by the chameleon between parallel plates. |
1012.4868 | Amir Fariborz | Amir H. Fariborz, Renata Jora, Joseph Schechter and M. Naeem Shahid | Are three flavors special? | null | Phys.Rev.D83:034018,2011 | 10.1103/PhysRevD.83.034018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has become clearer recently that the regular pattern of three flavor
nonets describing the low spin meson multiplets seems to require some
modification for the case of the spin 0 scalar mesons. One picture which has
had some success, treats the scalars in a chiral Lagrangian framework and
considers them to populate two nonets. These are, in turn, taken to result from
the mixing of two "bare" nonets, one of which is of quark- antiquark type and
the other of two quark- two antiquark type. Here we show that such a mixing is,
before chiral symmetry breaking terms are included, only possible for three
flavors. In other cases, the two types of structure can not have the same
chiral symmetry transformation property. Specifically, our criterion would lead
one to believe that scalar and pseudoscalar states containing charm would not
have "four quark" admixtures.
This work is of potential interest for constructing chiral Lagrangians based
on exact chiral symmetry which is then broken by well known specific terms. It
may also be of interest in studying some kinds of technicolor theories.
| [
{
"created": "Wed, 22 Dec 2010 03:00:42 GMT",
"version": "v1"
}
] | 2011-02-23 | [
[
"Fariborz",
"Amir H.",
""
],
[
"Jora",
"Renata",
""
],
[
"Schechter",
"Joseph",
""
],
[
"Shahid",
"M. Naeem",
""
]
] | It has become clearer recently that the regular pattern of three flavor nonets describing the low spin meson multiplets seems to require some modification for the case of the spin 0 scalar mesons. One picture which has had some success, treats the scalars in a chiral Lagrangian framework and considers them to populate two nonets. These are, in turn, taken to result from the mixing of two "bare" nonets, one of which is of quark- antiquark type and the other of two quark- two antiquark type. Here we show that such a mixing is, before chiral symmetry breaking terms are included, only possible for three flavors. In other cases, the two types of structure can not have the same chiral symmetry transformation property. Specifically, our criterion would lead one to believe that scalar and pseudoscalar states containing charm would not have "four quark" admixtures. This work is of potential interest for constructing chiral Lagrangians based on exact chiral symmetry which is then broken by well known specific terms. It may also be of interest in studying some kinds of technicolor theories. |
hep-ph/9510304 | Evan Reidell | X. Ji and J. Tang (MIT) and P. Hoodbhoy (Quaid-e-Azam, Pakistan) | The Spin Structure of the Nucleon in the Asymptotic Limit | 8 pages in REVTEX | Phys.Rev.Lett.76:740-743,1996 | 10.1103/PhysRevLett.76.740 | MIT-CTP-2476 | hep-ph nucl-th | null | In analogy to the Altarelli-Parisi equation for the quark and gluon helicity
contributions to the nucleon spin, we derive an evolution equation for the
quark and gluon orbital angular momenta. The solution of the combined equations
yields the asymptotic fractions of the nucleon spin carried by quarks and
gluons: $3n_f/(16+3n_f)$ and $16/(16+3n_f)$, respectively, where $n_f$ is the
number of active quark flavors. These are identical to the well-known
asymptotic partitions of the nucleon momentum between quark and gluon
contributions. We show that the axial-anomaly contribution to the quark
helicity is cancelled by a similar contribution to the quark orbital angular
momentum, making the total quark contribution to the nucleon spin anomaly-free.
| [
{
"created": "Mon, 16 Oct 1995 17:29:00 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Ji",
"X.",
"",
"MIT"
],
[
"Tang",
"J.",
"",
"MIT"
],
[
"Hoodbhoy",
"P.",
"",
"Quaid-e-Azam, Pakistan"
]
] | In analogy to the Altarelli-Parisi equation for the quark and gluon helicity contributions to the nucleon spin, we derive an evolution equation for the quark and gluon orbital angular momenta. The solution of the combined equations yields the asymptotic fractions of the nucleon spin carried by quarks and gluons: $3n_f/(16+3n_f)$ and $16/(16+3n_f)$, respectively, where $n_f$ is the number of active quark flavors. These are identical to the well-known asymptotic partitions of the nucleon momentum between quark and gluon contributions. We show that the axial-anomaly contribution to the quark helicity is cancelled by a similar contribution to the quark orbital angular momentum, making the total quark contribution to the nucleon spin anomaly-free. |
1410.0918 | Chuan-Ren Chen | Chuan-Ren Chen, Yu-Kuang Chu and Ho-Chin Tsai | An Elusive Vector Dark Matter | 11 pages, 5 figures | null | 10.1016/j.physletb.2014.12.043 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Even though the sensitivity of direct dark matter search experiments reach
the level about $10^{-45}~{\rm cm}^2$, there is no confident signal of dark
matter been observed. We point out that, if dark matter is a vector boson, the
null result in direct dark matter search experiments may due to the destructive
effects in dark-matter-nucleon elastic scattering. We illustrate the scenario
using a modified Higgs portal model that includes exotic quarks. The
significant cancellation can occur for certain mass gap between heavy quark and
dark matter. As a result, the spin-independent dark-matter-nucleon elastic
scattering is so suppressed that the future direct search experiments can
hardly observe the signal of dark matter.
| [
{
"created": "Fri, 3 Oct 2014 17:24:30 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Chen",
"Chuan-Ren",
""
],
[
"Chu",
"Yu-Kuang",
""
],
[
"Tsai",
"Ho-Chin",
""
]
] | Even though the sensitivity of direct dark matter search experiments reach the level about $10^{-45}~{\rm cm}^2$, there is no confident signal of dark matter been observed. We point out that, if dark matter is a vector boson, the null result in direct dark matter search experiments may due to the destructive effects in dark-matter-nucleon elastic scattering. We illustrate the scenario using a modified Higgs portal model that includes exotic quarks. The significant cancellation can occur for certain mass gap between heavy quark and dark matter. As a result, the spin-independent dark-matter-nucleon elastic scattering is so suppressed that the future direct search experiments can hardly observe the signal of dark matter. |
2310.02763 | Jacek Ciborowski | Jakub Rembielinski and Jacek Ciborowski | Possible explanation of not observing ultra-high energy cosmic neutrinos | null | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming that neutrinos are spacelike (tachyonic) fermions, we calculate
width for the kinematically allowed, lepton number conserving, three-body decay
$\nu_{\alpha}\rightarrow \nu_{\alpha} \; \nu_{\beta} \bar{\nu}_{\beta}$ in the
Standard Model. Decays of tachyonic neutrinos over cosmological distances can
lead to a reduction of the neutrino flux in the high-energy end of the
spectrum. We estimate upper limits on the spacelike neutrino mass based on the
PeV-energy cosmological neutrino events observed in the IceCube experiment.
These limits are close to those deduced from the measurements of $m_{\nu}^2$ in
the tritium-decay experiment KATRIN.
| [
{
"created": "Wed, 4 Oct 2023 12:20:29 GMT",
"version": "v1"
}
] | 2023-10-05 | [
[
"Rembielinski",
"Jakub",
""
],
[
"Ciborowski",
"Jacek",
""
]
] | Assuming that neutrinos are spacelike (tachyonic) fermions, we calculate width for the kinematically allowed, lepton number conserving, three-body decay $\nu_{\alpha}\rightarrow \nu_{\alpha} \; \nu_{\beta} \bar{\nu}_{\beta}$ in the Standard Model. Decays of tachyonic neutrinos over cosmological distances can lead to a reduction of the neutrino flux in the high-energy end of the spectrum. We estimate upper limits on the spacelike neutrino mass based on the PeV-energy cosmological neutrino events observed in the IceCube experiment. These limits are close to those deduced from the measurements of $m_{\nu}^2$ in the tritium-decay experiment KATRIN. |
hep-ph/0411077 | Luis. A. Sanchez | Diego A. Gutierrez, William A. Ponce, Luis A. Sanchez | Phenomenology of the SU(3)_c X SU(3)_L X U(1)_X model with right-handed
neutrinos | RevTeX, 10 pages, 4 figures. v2: 13 pages. Substantial changes. New
section about RGE analysis. Experimental data updated. v3: Discussions about
bounds from unitarity violation of the CKM matrix and from FCNC included.
Accepted for publication in Eur. Phys. J. C | Eur.Phys.J.C46:497-509,2006 | 10.1140/epjc/s2006-02513-y | null | hep-ph | null | A phenomenological analysis of the three-family local gauge group
$SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ with right-handed neutrinos is carried
out. Instead of using the minimal scalar sector able to break the symmetry in a
proper way, we introduce an alternative set of four Higgs scalar triplets,
which combined with an anomaly-free discrete symmetry, produces a quark mass
spectrum without hierarchies in the Yukawa coupling contants. We also embed the
structure into a simple gauge group and show some conditions to achieve a low
energy gauge coupling unification, avoiding possible conflict with proton decay
bounds. By using experimental results from the CERN-LEP, SLAC linear collider
and atomic parity violation data, we update constraints on several parameters
of the model.
| [
{
"created": "Fri, 5 Nov 2004 02:08:15 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Oct 2005 05:57:01 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Feb 2006 18:55:03 GMT",
"version": "v3"
}
] | 2009-01-07 | [
[
"Gutierrez",
"Diego A.",
""
],
[
"Ponce",
"William A.",
""
],
[
"Sanchez",
"Luis A.",
""
]
] | A phenomenological analysis of the three-family local gauge group $SU(3)_c\otimes SU(3)_L\otimes U(1)_X$ with right-handed neutrinos is carried out. Instead of using the minimal scalar sector able to break the symmetry in a proper way, we introduce an alternative set of four Higgs scalar triplets, which combined with an anomaly-free discrete symmetry, produces a quark mass spectrum without hierarchies in the Yukawa coupling contants. We also embed the structure into a simple gauge group and show some conditions to achieve a low energy gauge coupling unification, avoiding possible conflict with proton decay bounds. By using experimental results from the CERN-LEP, SLAC linear collider and atomic parity violation data, we update constraints on several parameters of the model. |
hep-ph/9211279 | null | Eric D. Carlson and Meng Yuan Wang | Trinification and the Strong P Problem | null | null | 10.1063/1.43438 | Harvard Preprint HUTP-92/A057 | hep-ph | null | Models with spontaneously broken parity symmetry can solve the strong $CP$
problem in a natural way. We construct such a model in the context of $\SU3^3$
unification. Parity has the conventional meaning in this model, and the gauge
group is unified.
| [
{
"created": "Thu, 19 Nov 1992 21:12:20 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Carlson",
"Eric D.",
""
],
[
"Wang",
"Meng Yuan",
""
]
] | Models with spontaneously broken parity symmetry can solve the strong $CP$ problem in a natural way. We construct such a model in the context of $\SU3^3$ unification. Parity has the conventional meaning in this model, and the gauge group is unified. |
hep-ph/9401329 | null | Debajyoti Choudhury, Raj Gandhi, J.A. Gracey and Biswarup
Mukhopadhyaya | Two-Loop Neutrino Masses and the Solar Neutrino Problem | 24 pages, Two figures, attached as postscript files at the end,
Latex, CTP-TAMU-76/93, MRI-PHY-12/93, LTH-326 | Phys.Rev.D50:3468-3476,1994 | 10.1103/PhysRevD.50.3468 | null | hep-ph | null | The addition of $m$ singlet right-handed neutrinos to the Standard Model
leads to radiatively generated mass corrections for the $SU(2)_L $ doublet
neutrinos. For those neutrinos which are massless at the tree level after this
addition, this implies a small mass generated at the two-loop level via
$W^{\pm}$ exchange. We calculate these mass corrections exactly by obtaining an
analytic form for the general case of $n$ doublets and $m$ singlets. As a
phenomenological application, we consider the $m=1$ case and examine the masses
and mixings of the doublet neutrinos which arise as a result of the two-loop
correction in the light of experimental data from two sources which may shed
light on the question of neutrino masses. These are(a) the neutrino detectors
reporting a solar neutrino deficit (and its resolution via
Mikheyev-Smirnov-Wolfenstein matter oscillations), and
(b) the COBE satellite data on the non-zero angular variations of the cosmic
microwave background temperature (and its possible implications for hot dark
matter). Within the framework of the extension considered here, which leaves
the gauge group structure of the Standard Model intact, we show that it is
possible for neutrinos to acquire small masses naturally, with values which are
compatible with current theoretical bias and experimental data.
| [
{
"created": "Tue, 25 Jan 1994 23:03:42 GMT",
"version": "v1"
}
] | 2011-09-21 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Gandhi",
"Raj",
""
],
[
"Gracey",
"J. A.",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | The addition of $m$ singlet right-handed neutrinos to the Standard Model leads to radiatively generated mass corrections for the $SU(2)_L $ doublet neutrinos. For those neutrinos which are massless at the tree level after this addition, this implies a small mass generated at the two-loop level via $W^{\pm}$ exchange. We calculate these mass corrections exactly by obtaining an analytic form for the general case of $n$ doublets and $m$ singlets. As a phenomenological application, we consider the $m=1$ case and examine the masses and mixings of the doublet neutrinos which arise as a result of the two-loop correction in the light of experimental data from two sources which may shed light on the question of neutrino masses. These are(a) the neutrino detectors reporting a solar neutrino deficit (and its resolution via Mikheyev-Smirnov-Wolfenstein matter oscillations), and (b) the COBE satellite data on the non-zero angular variations of the cosmic microwave background temperature (and its possible implications for hot dark matter). Within the framework of the extension considered here, which leaves the gauge group structure of the Standard Model intact, we show that it is possible for neutrinos to acquire small masses naturally, with values which are compatible with current theoretical bias and experimental data. |
hep-ph/9510300 | Arnd Brandenburg | Werner Bernreuther, Arnd Brandenburg, and Peter Uwer (Institut f\"ur
Theoretische Physik, Physikzentrum, Rheinisch-Westf\"alische Technische
Hochschule Aachen, Aachen, Germany) | Transverse Polarization of Top Quark Pairs at the Tevatron and the Large
Hadron Collider | 14 pages, LaTeX; 8 uuencoded, tar-compressed figures added separately | Phys.Lett. B368 (1996) 153-162 | 10.1016/0370-2693(95)01475-6 | PITHA 95/26 | hep-ph | null | We investigate the prospects to observe effects of transverse polarization of
top quarks in $pp,p\bar{p}\to t\bar{t}X$. QCD absorptive parts generate a
polarization of top quarks and antiquarks transverse to the production plane in
the partonic processes $q\bar{q}\to t\bar{t}$ and $gg\to t\bar{t}$, which
reaches values of a few percent. These perturbative QCD effects are decreased
at the hadronic level. A measurement through momentum correlations among the
$t$ and $\bar{t}$ decay products will be difficult both at an upgraded Tevatron
and at the LHC.
| [
{
"created": "Mon, 16 Oct 1995 10:36:22 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bernreuther",
"Werner",
"",
"Institut für\n Theoretische Physik, Physikzentrum, Rheinisch-Westfälische Technische\n Hochschule Aachen, Aachen, Germany"
],
[
"Brandenburg",
"Arnd",
"",
"Institut für\n Theoretische Physik, Physikzentrum, Rheinisch-Westfälische Technische\n Hochschule Aachen, Aachen, Germany"
],
[
"Uwer",
"Peter",
"",
"Institut für\n Theoretische Physik, Physikzentrum, Rheinisch-Westfälische Technische\n Hochschule Aachen, Aachen, Germany"
]
] | We investigate the prospects to observe effects of transverse polarization of top quarks in $pp,p\bar{p}\to t\bar{t}X$. QCD absorptive parts generate a polarization of top quarks and antiquarks transverse to the production plane in the partonic processes $q\bar{q}\to t\bar{t}$ and $gg\to t\bar{t}$, which reaches values of a few percent. These perturbative QCD effects are decreased at the hadronic level. A measurement through momentum correlations among the $t$ and $\bar{t}$ decay products will be difficult both at an upgraded Tevatron and at the LHC. |
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