id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0204147 | Jusak Tandean | Jusak Tandean, S. Gardner | Nonresonant Contributions in B->rho pi Decay | 15 pages, 3 figures; minor changes, version to appear in Phys. Rev. D | Phys.Rev.D66:034019,2002 | 10.1103/PhysRevD.66.034019 | SLAC-PUB-9199, UK/TP-2002-05 | hep-ph hep-ex | null | We consider nonresonant contributions in the Dalitz plot analysis of B->rho
pi->pi^+ pi^- pi^0 decay and their potential impact on the extraction of the
CKM parameter alpha. In particular, we examine the role of the heavy mesons B^*
and B_0, via the process B->pi (B^*, B_0)->pi^+ pi^- pi^0, and their
interference with resonant contributions in the rho-mass region. We discuss the
inherent uncertainties and suggest that the effects may be substantially
smaller than previously indicated.
| [
{
"created": "Mon, 15 Apr 2002 00:37:45 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2002 13:52:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Tandean",
"Jusak",
""
],
[
"Gardner",
"S.",
""
]
] | We consider nonresonant contributions in the Dalitz plot analysis of B->rho pi->pi^+ pi^- pi^0 decay and their potential impact on the extraction of the CKM parameter alpha. In particular, we examine the role of the heavy mesons B^* and B_0, via the process B->pi (B^*, B_0)->pi^+ pi^- pi^0, and their interference with resonant contributions in the rho-mass region. We discuss the inherent uncertainties and suggest that the effects may be substantially smaller than previously indicated. |
2010.09762 | Satyanarayan Mukhopadhyay | Disha Bhatia, Satyanarayan Mukhopadhyay | Unitarity limits on thermal dark matter in (non-)standard cosmologies | 21 pages, 10 figures; v2: minor additions to text, version as
published in JHEP | JHEP03(2021)133 | 10.1007/JHEP03(2021)133 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the upper bound on the inelastic reaction cross-section implied by
S-matrix unitarity, we derive the thermally averaged maximum dark matter (DM)
annihilation rate for general $k \rightarrow 2$ number-changing reactions, with
$k \geq 2$, taking place either entirely within the dark sector, or involving
standard model fields. This translates to a maximum mass of the particle
saturating the observed DM abundance, which, for dominantly $s$-wave
annihilations, is obtained to be around $130$ TeV, $1$ GeV, $7$ MeV and $110$
keV, for $k=2,3,4$ and $5$, respectively, in a radiation dominated Universe,
for a real or complex scalar DM stabilized by a minimal symmetry. For modified
thermal histories in the pre-big bang nucleosynthesis era, with an intermediate
period of matter domination, values of reheating temperature higher than
$\mathcal{O}(200)$ GeV for $k \geq 4$, $\mathcal{O}(1)$ TeV for $k=3$ and
$\mathcal{O}(50)$ TeV for $k=2$ are strongly disfavoured by the combined
requirements of unitarity and DM relic abundance, for DM freeze-out before
reheating.
| [
{
"created": "Mon, 19 Oct 2020 18:03:23 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2021 06:22:40 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"Bhatia",
"Disha",
""
],
[
"Mukhopadhyay",
"Satyanarayan",
""
]
] | Using the upper bound on the inelastic reaction cross-section implied by S-matrix unitarity, we derive the thermally averaged maximum dark matter (DM) annihilation rate for general $k \rightarrow 2$ number-changing reactions, with $k \geq 2$, taking place either entirely within the dark sector, or involving standard model fields. This translates to a maximum mass of the particle saturating the observed DM abundance, which, for dominantly $s$-wave annihilations, is obtained to be around $130$ TeV, $1$ GeV, $7$ MeV and $110$ keV, for $k=2,3,4$ and $5$, respectively, in a radiation dominated Universe, for a real or complex scalar DM stabilized by a minimal symmetry. For modified thermal histories in the pre-big bang nucleosynthesis era, with an intermediate period of matter domination, values of reheating temperature higher than $\mathcal{O}(200)$ GeV for $k \geq 4$, $\mathcal{O}(1)$ TeV for $k=3$ and $\mathcal{O}(50)$ TeV for $k=2$ are strongly disfavoured by the combined requirements of unitarity and DM relic abundance, for DM freeze-out before reheating. |
2111.12156 | Hugues Beauchesne | Hugues Beauchesne and Giovanni Grilli di Cortona | Event-level variables for semivisible jets using anomalous jet tagging | Contribution to Snowmass 2022, 16 pages, 8 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Semivisible jets are a characteristic signature of many confining dark
sectors and consist of jets of visible hadrons intermixed with invisible stable
particles. Since their initial proposal, considerable progress has been made in
developing techniques for tagging anomalous jets. In this paper, we show that
the ability to tag semivisible jets can be used to define new event-level
variables which use generally ignored kinematic information and can
considerably increase our ability to discover dark confining sectors. In
practice, our best results are obtained by using the coefficients of the
decomposition of the missing transverse momentum in terms of the transverse
momenta of the jets tagged as anomalous. A benchmark scenario is introduced and
the increase in significance due to these new variables is studied over some of
its parameter space.
| [
{
"created": "Tue, 23 Nov 2021 21:15:52 GMT",
"version": "v1"
}
] | 2021-11-25 | [
[
"Beauchesne",
"Hugues",
""
],
[
"di Cortona",
"Giovanni Grilli",
""
]
] | Semivisible jets are a characteristic signature of many confining dark sectors and consist of jets of visible hadrons intermixed with invisible stable particles. Since their initial proposal, considerable progress has been made in developing techniques for tagging anomalous jets. In this paper, we show that the ability to tag semivisible jets can be used to define new event-level variables which use generally ignored kinematic information and can considerably increase our ability to discover dark confining sectors. In practice, our best results are obtained by using the coefficients of the decomposition of the missing transverse momentum in terms of the transverse momenta of the jets tagged as anomalous. A benchmark scenario is introduced and the increase in significance due to these new variables is studied over some of its parameter space. |
1511.00683 | Andrew Kobach | Andr\'e de Gouv\^ea, Andrew Kobach | Global Constraints on a Heavy Neutrino | 19 pages, 13 figures, 3 tables. Typographical errors corrected,
results and conclusions unchanged | Phys. Rev. D 93, 033005 (2016) | 10.1103/PhysRevD.93.033005 | NUHEP-TH/15-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate constraints on the existence of a heavy, mostly sterile neutrino
with mass between 10 eV and 1 TeV. We improve upon previous analyses by
performing a global combination and expanding the experimental inputs to
simultaneously include tests for lepton universality, lepton-flavor-violating
processes, electroweak precision data, dipole moments, and neutrinoless double
beta decay. Assuming the heavy neutrino and its decay products are invisible to
detection, we further include, in a self-consistent manner, constraints from
direct kinematic searches, the kinematics of muon decay, cosmology, and
neutrino oscillations, in order to estimate constraints on the values of
$|U_{e4}|^2$, $|U_{\mu4}|^2$, and $|U_{\tau4}|^2$.
| [
{
"created": "Mon, 2 Nov 2015 21:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2015 22:01:27 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Feb 2016 17:39:53 GMT",
"version": "v3"
}
] | 2016-02-17 | [
[
"de Gouvêa",
"André",
""
],
[
"Kobach",
"Andrew",
""
]
] | We estimate constraints on the existence of a heavy, mostly sterile neutrino with mass between 10 eV and 1 TeV. We improve upon previous analyses by performing a global combination and expanding the experimental inputs to simultaneously include tests for lepton universality, lepton-flavor-violating processes, electroweak precision data, dipole moments, and neutrinoless double beta decay. Assuming the heavy neutrino and its decay products are invisible to detection, we further include, in a self-consistent manner, constraints from direct kinematic searches, the kinematics of muon decay, cosmology, and neutrino oscillations, in order to estimate constraints on the values of $|U_{e4}|^2$, $|U_{\mu4}|^2$, and $|U_{\tau4}|^2$. |
1901.00157 | Chung Kao | Rishabh Jain and Chung Kao | Charming Top Decays with Flavor Changing Neutral Higgs Boson and WW at
Hadron Colliders | 15 pages, 7 figures, version to appear in Physical Review D. arXiv
admin note: text overlap with arXiv:1112.1707 | Phys. Rev. D 99, 055036 (2019) | 10.1103/PhysRevD.99.055036 | OU-HEP-181222 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the prospects for discovering a top quark decaying into one
light Higgs boson ($h^0$) along with a charm quark ($c$) in top quark pair
production at the CERN Large Hadron Collider (LHC) and future hadron colliers.
A general two Higgs doublet model is adopted to study the signature of flavor
changing neutral Higgs (FCNH) interactions with $t \to c h^0$, followed by $h^0
\to WW^* \to \ell^+ \ell^- +\notE_T$, where $h^0$ is the CP-even Higgs boson
and $\notE_T$ stands for missing transverse energy from neutrinos. We study the
discovery potential for this FCNH signal and physics background from dominant
processes with realistic acceptance cuts as well as tagging and mistagging
efficiencies. Promising results are found for the LHC running at 13 TeV and 14
TeV center-of-mass energy as well as future pp colliders at 27 TeV and 100 TeV.
| [
{
"created": "Tue, 1 Jan 2019 14:33:47 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2019 02:35:41 GMT",
"version": "v2"
}
] | 2019-04-03 | [
[
"Jain",
"Rishabh",
""
],
[
"Kao",
"Chung",
""
]
] | We investigate the prospects for discovering a top quark decaying into one light Higgs boson ($h^0$) along with a charm quark ($c$) in top quark pair production at the CERN Large Hadron Collider (LHC) and future hadron colliers. A general two Higgs doublet model is adopted to study the signature of flavor changing neutral Higgs (FCNH) interactions with $t \to c h^0$, followed by $h^0 \to WW^* \to \ell^+ \ell^- +\notE_T$, where $h^0$ is the CP-even Higgs boson and $\notE_T$ stands for missing transverse energy from neutrinos. We study the discovery potential for this FCNH signal and physics background from dominant processes with realistic acceptance cuts as well as tagging and mistagging efficiencies. Promising results are found for the LHC running at 13 TeV and 14 TeV center-of-mass energy as well as future pp colliders at 27 TeV and 100 TeV. |
hep-ph/9406342 | null | D. Ghilencea, L. Micu | Structure Dependence in $\pi \to \bf\ell\nu, \pi\ to \ell\nu\gamma$ and
$\pi^0\ to \gamma\gamma$ Decays | no. pages 16 + 6 pages with figures by request, LATEX | Phys.Rev. D52 (1995) 1577-1587 | 10.1103/PhysRevD.52.1577 | IFA-FT-395-1994 | hep-ph | null | The amplitudes of $\pi$-meson decays are calculated in a relativistic
nonperturbative quark model which assumes that mesons are made of a quark
antiquark pair and of a scalar neutral component representing the contribution
of the nonelementary fluctuations of the quark gluonic field. The experimental
data can be fitted in a satisfactory manner using current quark masses
$m_u\approx1.5\ MeV, m_d\approx9\ MeV$.
| [
{
"created": "Mon, 20 Jun 1994 11:24:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ghilencea",
"D.",
""
],
[
"Micu",
"L.",
""
]
] | The amplitudes of $\pi$-meson decays are calculated in a relativistic nonperturbative quark model which assumes that mesons are made of a quark antiquark pair and of a scalar neutral component representing the contribution of the nonelementary fluctuations of the quark gluonic field. The experimental data can be fitted in a satisfactory manner using current quark masses $m_u\approx1.5\ MeV, m_d\approx9\ MeV$. |
2302.07165 | Harleen Dahiya Dr. | Shubham Sharma, Narinder Kumar and Harleen Dahiya | Sub-leading twist transverse momentum dependent parton distributions in
the light-front quark-diquark model | 37 Pages, 12 Figures, 6 Tables, accepted for publication in Nuclear
Physics B, arXiv admin note: text overlap with arXiv:2301.09536 | Nucl. Phys. B, 992, 116247 (2023) | 10.1016/j.nuclphysb.2023.116247 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this study, the T-even sub-leading twist transverse momentum dependent
distributions (TMDs) of proton in the light-front quark-diquark model (LFQDM)
have been investigated. We have derived the overlap form of the light-front
wave functions (LFWFs) for the sub-leading twist proton TMDs by detangling the
un-integrated quark-quark correlator for the semi-inclusive deep inelastic
scattering (SIDIS). We have obtained the explicit expressions of TMDs for both
the cases of the diquark being a scalar or a vector and analysed their
relationships with leading twist TMDs within the same model. Average transverse
momenta and average square transverse momenta for the TMDs have been tabulated
and compared with the results from the light-front bag model and the
light-front constituent quark model (LFCQM). In addition to this, we have also
compared our results for the PDF $e(x)$ with the recent CLAS collaboration
results.
| [
{
"created": "Tue, 14 Feb 2023 16:27:19 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2023 10:01:51 GMT",
"version": "v2"
}
] | 2023-08-01 | [
[
"Sharma",
"Shubham",
""
],
[
"Kumar",
"Narinder",
""
],
[
"Dahiya",
"Harleen",
""
]
] | In this study, the T-even sub-leading twist transverse momentum dependent distributions (TMDs) of proton in the light-front quark-diquark model (LFQDM) have been investigated. We have derived the overlap form of the light-front wave functions (LFWFs) for the sub-leading twist proton TMDs by detangling the un-integrated quark-quark correlator for the semi-inclusive deep inelastic scattering (SIDIS). We have obtained the explicit expressions of TMDs for both the cases of the diquark being a scalar or a vector and analysed their relationships with leading twist TMDs within the same model. Average transverse momenta and average square transverse momenta for the TMDs have been tabulated and compared with the results from the light-front bag model and the light-front constituent quark model (LFCQM). In addition to this, we have also compared our results for the PDF $e(x)$ with the recent CLAS collaboration results. |
1202.3300 | Wei Wang | Chuan-Hung Chen, Chao-Qiang Geng, Wei Wang | CP violation in $D^0 \to (K^- K^+, \pi^- \pi^+)$ from diquarks | 9 pages, 3 figures, reference added | Phys. Rev. D 85, 077702 (2012) | 10.1103/PhysRevD.85.077702 | DESY 12-027 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The explanation of the large CP asymmetries in $D^0\to (\pi^+\pi^-, K^+K^-)$
decays observed by the LHCb collaboration is likely to call for new physics
beyond the CKM paradigm. We explore new contributions caused by the
color-sextet scalar diquark, and demonstrate that the diquark with the mass of
order 1 TeV and nominal couplings with quarks can generate the CP asymmetries
at the percent level. Using the experimental data on branching ratios and CP
asymmetries of $D^0\to (\pi^+\pi^-, K^+K^-)$, we derive the constraints on the
diquark mass and couplings, which can be further examined on hadron colliders
in the dijet final states.
| [
{
"created": "Wed, 15 Feb 2012 13:21:35 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2012 15:07:21 GMT",
"version": "v2"
}
] | 2012-04-20 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Wang",
"Wei",
""
]
] | The explanation of the large CP asymmetries in $D^0\to (\pi^+\pi^-, K^+K^-)$ decays observed by the LHCb collaboration is likely to call for new physics beyond the CKM paradigm. We explore new contributions caused by the color-sextet scalar diquark, and demonstrate that the diquark with the mass of order 1 TeV and nominal couplings with quarks can generate the CP asymmetries at the percent level. Using the experimental data on branching ratios and CP asymmetries of $D^0\to (\pi^+\pi^-, K^+K^-)$, we derive the constraints on the diquark mass and couplings, which can be further examined on hadron colliders in the dijet final states. |
hep-ph/0610302 | Zhenyu Han | Zhenyu Han | Electroweak Constraints on Effective Theories | To appear in Proceedings of SUSY06, the 14th International Conference
on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine,
California, 12-17 June 2006 | AIPConf.Proc.903:435-438,2007 | 10.1063/1.2735217 | null | hep-ph | null | We discuss electroweak constraints on TeV scale extensions of the standard
model. To obtain model-independent results, effective theory approach is
adopted. Constraints are given on arbitrary linear combinations of a set of
dimension-6 operators that respect the SM gauge symmetry, as well as CP, lepton
and baryon number conservation. Applications of the results are also discussed.
| [
{
"created": "Mon, 23 Oct 2006 22:52:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Han",
"Zhenyu",
""
]
] | We discuss electroweak constraints on TeV scale extensions of the standard model. To obtain model-independent results, effective theory approach is adopted. Constraints are given on arbitrary linear combinations of a set of dimension-6 operators that respect the SM gauge symmetry, as well as CP, lepton and baryon number conservation. Applications of the results are also discussed. |
1001.1652 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the ${1\over 2}^{\pm}$ flavor antitriplet heavy baryon
states with QCD sum rules | 11 pages, 16 figures, published version | Eur.Phys.J.C68:479-486,2010 | 10.1140/epjc/s10052-010-1365-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the masses and pole residues of the ${1\over
2}^\pm$ flavor antitriplet heavy baryon states ($\Lambda_c^+$,
$\Xi_c^+,\Xi_c^0)$ and ($\Lambda_b^0$, $\Xi_b^0,\Xi_b^-)$ by subtracting the
contributions from the corresponding ${1\over 2}^\mp$ heavy baryon states with
the QCD sum rules, and observe the masses are in good agreement with the
experimental data and make reasonable predictions for the unobserved ${1\over
2}^-$ bottom baryon states. Once reasonable values of the pole residues
$\lambda_{\Lambda}$ and $\lambda_{\Xi}$ are obtained, we can take them as basic
parameters to study the revelent hadronic processes with the QCD sum rules.
| [
{
"created": "Mon, 11 Jan 2010 13:24:50 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Feb 2010 12:31:47 GMT",
"version": "v2"
},
{
"created": "Sun, 21 Mar 2010 12:49:53 GMT",
"version": "v3"
},
{
"created": "Tue, 8 Jun 2010 08:15:46 GMT",
"version": "v4"
}
] | 2010-08-09 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we study the masses and pole residues of the ${1\over 2}^\pm$ flavor antitriplet heavy baryon states ($\Lambda_c^+$, $\Xi_c^+,\Xi_c^0)$ and ($\Lambda_b^0$, $\Xi_b^0,\Xi_b^-)$ by subtracting the contributions from the corresponding ${1\over 2}^\mp$ heavy baryon states with the QCD sum rules, and observe the masses are in good agreement with the experimental data and make reasonable predictions for the unobserved ${1\over 2}^-$ bottom baryon states. Once reasonable values of the pole residues $\lambda_{\Lambda}$ and $\lambda_{\Xi}$ are obtained, we can take them as basic parameters to study the revelent hadronic processes with the QCD sum rules. |
hep-ph/9803294 | Sven Heinemeyer | S. Heinemeyer | Two-loop calculations in the MSSM | 16 pages, 8 figures, Talk given at the workshop ``Quantum Effects in
the MSSM'', Sept. 1997, Barcelona, Spain | null | null | KA-TP-18-1997 | hep-ph | null | Recent results on two--loop calculations in the MSSM are reviewed. The
computation of the QCD corrections to \Delta\rho, \Delta r and to the mass of
the lightest Higgs boso in the MSSM are presented.
| [
{
"created": "Tue, 10 Mar 1998 13:48:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Heinemeyer",
"S.",
""
]
] | Recent results on two--loop calculations in the MSSM are reviewed. The computation of the QCD corrections to \Delta\rho, \Delta r and to the mass of the lightest Higgs boso in the MSSM are presented. |
hep-ph/0703245 | Patricia Ball | Patricia Ball | Basics of D0-\bar D0 Mixing | Quasi-Impromptu Talk given at XLIInd Rencontres de Moriond,
Electroweak Interactions and Unified Theories, La Thuile, Italy, March 2007;
typos removed; acknowledgements added | null | null | IPPP/07/09 | hep-ph | null | Complementing the presentations, at this conference, of the first
experimental evidence for $D$ mixing found at BaBar and Belle, I discuss the
theoretical status of $D$ mixing.
| [
{
"created": "Thu, 22 Mar 2007 18:25:08 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2007 17:18:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ball",
"Patricia",
""
]
] | Complementing the presentations, at this conference, of the first experimental evidence for $D$ mixing found at BaBar and Belle, I discuss the theoretical status of $D$ mixing. |
0903.1889 | Muneyuki Ishida | Muneyuki Ishida and Keiji Igi | Test of Universal Rise of Hadronic Total Cross Sections based on pi p,
Kp and pbar p,pp Scatterings | 32 pages, 12 figures. to be published in Phys. Rev. D | Phys.Rev.D79:096003,2009 | 10.1103/PhysRevD.79.096003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently there are several evidences of the hadronic total cross section
sigma(tot) to be proportional to B (log s)2 consistent with the Froissart
unitarity bound. The COMPETE collaborations have further assumed sigma(tot) = B
(log s/s0)2 + Z to extend its universal rise with the common value of B and s0
for all hadronic scatterings to reduce the number of adjustable parameters. The
coefficient B was suggested to be universal in the arguments of colour glass
condensate (CGC) of QCD in recent years. There has been, however, no rigorous
proof yet based only on QCD. We attempt to investigate the value of B for pi+-
p, K+- p and pbar p,pp scatterings respectively through the search for the
simultaneous best fit to the experimental sigma(tot) and rho ratios at high
energies. The sigma(tot) at the resonance and intermediate energy regions has
also been exploited as a duality constraint based on the special form of
finite-energy sum rule(FESR). We estimate the values of B, s0 and Z
individually for pi+- p, K+- p and pbar p,pp scatterings without using the
universality hypothesis. It turs out that the values of B are mutually
consistent within one standard deviation. It has to be stressed that we cannot
obtain such a definite conclusion without the duality constraint. It is also
interesting to note that the values of Z for pi p, Kp and pbar(p)p
approximately satisfy the ratio 2:2:3 predicted by the quark model. The
obtained value of B for pbar(p)p is Bpp = 0.280 +- 0.015 mb, which predicts
sigma(tot)(pp) =108.0 +- 1.9mb and rho(pp) =0.131+- 0.0025 at the LHC energy
s^0.5 =14 TeV.
| [
{
"created": "Wed, 11 Mar 2009 02:03:11 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Apr 2009 23:25:07 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"Ishida",
"Muneyuki",
""
],
[
"Igi",
"Keiji",
""
]
] | Recently there are several evidences of the hadronic total cross section sigma(tot) to be proportional to B (log s)2 consistent with the Froissart unitarity bound. The COMPETE collaborations have further assumed sigma(tot) = B (log s/s0)2 + Z to extend its universal rise with the common value of B and s0 for all hadronic scatterings to reduce the number of adjustable parameters. The coefficient B was suggested to be universal in the arguments of colour glass condensate (CGC) of QCD in recent years. There has been, however, no rigorous proof yet based only on QCD. We attempt to investigate the value of B for pi+- p, K+- p and pbar p,pp scatterings respectively through the search for the simultaneous best fit to the experimental sigma(tot) and rho ratios at high energies. The sigma(tot) at the resonance and intermediate energy regions has also been exploited as a duality constraint based on the special form of finite-energy sum rule(FESR). We estimate the values of B, s0 and Z individually for pi+- p, K+- p and pbar p,pp scatterings without using the universality hypothesis. It turs out that the values of B are mutually consistent within one standard deviation. It has to be stressed that we cannot obtain such a definite conclusion without the duality constraint. It is also interesting to note that the values of Z for pi p, Kp and pbar(p)p approximately satisfy the ratio 2:2:3 predicted by the quark model. The obtained value of B for pbar(p)p is Bpp = 0.280 +- 0.015 mb, which predicts sigma(tot)(pp) =108.0 +- 1.9mb and rho(pp) =0.131+- 0.0025 at the LHC energy s^0.5 =14 TeV. |
2004.10359 | Hoang Bao Tran Tan | V. V. Flambaum, I. B. Samsonov and H. B. Tran Tan | Limits on $CP$-violating hadronic interactions and proton EDM from
paramagnetic molecules | 27 pages. V2: major corrections, V3: comments on uncertainties and
other minor corrections, journal version | null | 10.1007/JHEP10(2020)077 | null | hep-ph nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Experiments with paramagnetic ground or metastable excited states of
molecules (ThO, HfF$^+$, YbF, YbOH, BaF, PbO, etc.) provide strong constraints
on electron electric dipole moment (EDM) and coupling constant $C_{SP}$ of
contact semileptonic interaction. We compute new contributions to $C_{SP}$
arising from the nucleon EDMs due to combined electric and magnetic
electron-nucleon interaction. This allows us to improve limits from the
experiments with paramagnetic molecules on the $CP$-violating parameters, such
as the proton EDM, $|d_p|< 1.1\times 10^{-23} e\cdot $cm, the QCD vacuum angle,
$|\bar \theta|<1.4\times 10^{-8}$, as well as the quark chromo-EDMs and
$\pi$-meson-nucleon couplings. Our results may also be used to search for the
axion dark matter which produces oscillating $\bar\theta$.
| [
{
"created": "Wed, 22 Apr 2020 01:34:31 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2020 01:11:06 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jul 2020 03:59:35 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Sep 2020 01:44:53 GMT",
"version": "v4"
}
] | 2020-10-28 | [
[
"Flambaum",
"V. V.",
""
],
[
"Samsonov",
"I. B.",
""
],
[
"Tan",
"H. B. Tran",
""
]
] | Experiments with paramagnetic ground or metastable excited states of molecules (ThO, HfF$^+$, YbF, YbOH, BaF, PbO, etc.) provide strong constraints on electron electric dipole moment (EDM) and coupling constant $C_{SP}$ of contact semileptonic interaction. We compute new contributions to $C_{SP}$ arising from the nucleon EDMs due to combined electric and magnetic electron-nucleon interaction. This allows us to improve limits from the experiments with paramagnetic molecules on the $CP$-violating parameters, such as the proton EDM, $|d_p|< 1.1\times 10^{-23} e\cdot $cm, the QCD vacuum angle, $|\bar \theta|<1.4\times 10^{-8}$, as well as the quark chromo-EDMs and $\pi$-meson-nucleon couplings. Our results may also be used to search for the axion dark matter which produces oscillating $\bar\theta$. |
hep-ph/9906466 | Colin Froggatt | C.D. Froggatt and H. B. Nielsen | Why do we have parity violation? | 10 page LaTeX file; updated version of invited talk published in the
Proceedings of the International Workshop on {\it What comes beyond the
Standard Model}, Bled, Slovenia, 29 June - 9 July 1998 (DMFA -
zalo\u{z}ni\u{s}tvo, Ljubljana) | null | null | GUTPA/99/05/2 | hep-ph | null | We discuss here two of the questions posed at the beginning of the Bled 1998
workshop: Why is the weak charge dependent on handedness? Why do we have parity
violation in the Standard Model? It is argued that the quarks and leptons must
be protected from gaining a fundamental mass, very large compared to the
electroweak scale, by gauge invariance and hence that their gauge charges must
depend on handedness. Furthermore we argue that it is the conservation of
parity in the electromagnetic and strong interactions rather than parity
violation in the weak interactions that needs an explanation. We derive this
parity conservation and indeed the whole system of Weyl fermion representations
in the Standard Model from a few simple assumptions: Mass protection, small
representations, anomaly cancellation and the Standard Model gauge group
$S(U(2)\times U(3))$.
| [
{
"created": "Wed, 23 Jun 1999 13:39:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Froggatt",
"C. D.",
""
],
[
"Nielsen",
"H. B.",
""
]
] | We discuss here two of the questions posed at the beginning of the Bled 1998 workshop: Why is the weak charge dependent on handedness? Why do we have parity violation in the Standard Model? It is argued that the quarks and leptons must be protected from gaining a fundamental mass, very large compared to the electroweak scale, by gauge invariance and hence that their gauge charges must depend on handedness. Furthermore we argue that it is the conservation of parity in the electromagnetic and strong interactions rather than parity violation in the weak interactions that needs an explanation. We derive this parity conservation and indeed the whole system of Weyl fermion representations in the Standard Model from a few simple assumptions: Mass protection, small representations, anomaly cancellation and the Standard Model gauge group $S(U(2)\times U(3))$. |
2204.08440 | Tom Tong | Vincenzo Cirigliano, Wouter Dekens, Jordy de Vries, Emanuele
Mereghetti, Tom Tong | Beta-decay implications for the W-boson mass anomaly | null | null | 10.1103/PhysRevD.106.075001 | INT-PUB-22-014 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out the necessity to consider $\beta$-decay observables in
resolutions of the $W$-boson anomaly in the Standard Model Effective Field
Theory that go beyond pure oblique corrections. We demonstrate that present
global analyses that explain the $W$-boson mass anomaly predict a large,
percent-level, violation of first-row CKM unitarity. We investigate what
solutions to the $W$-boson mass anomaly survive after including $\beta$-decay
constraints.
| [
{
"created": "Mon, 18 Apr 2022 17:52:41 GMT",
"version": "v1"
}
] | 2022-10-19 | [
[
"Cirigliano",
"Vincenzo",
""
],
[
"Dekens",
"Wouter",
""
],
[
"de Vries",
"Jordy",
""
],
[
"Mereghetti",
"Emanuele",
""
],
[
"Tong",
"Tom",
""
]
] | We point out the necessity to consider $\beta$-decay observables in resolutions of the $W$-boson anomaly in the Standard Model Effective Field Theory that go beyond pure oblique corrections. We demonstrate that present global analyses that explain the $W$-boson mass anomaly predict a large, percent-level, violation of first-row CKM unitarity. We investigate what solutions to the $W$-boson mass anomaly survive after including $\beta$-decay constraints. |
0807.1082 | Redamy Perez Ramos | Wlofgang Ochs (MPI), Redamy Perez Ramos | Particle Multiplicity in Jets and Sub-jets with Jet Axis from Color
Current | null | Phys.Rev.D78:034010,2008 | 10.1103/PhysRevD.78.034010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the particle multiplicity in a jet or sub-jet as derived from an
energy-multiplicity 2-particle correlation. This definition avoids the notion
of a globally fixed jet axis and allows for the study of smaller jet cone
openings in a more stable way. The results are sensitive to the mean color
current $<C >_{A_0} $ in the jet from primary parton $A_0$ which takes into
account intermediate partonic processes in the sub-jet production where $C_F< <
C >_{A_0} < N_c$ at high energies. We generalize previous calculations in
Leading Logarithmic Approximation (LLA). The size of the effects related to
this jet axis definition are computed for multiplicities in sub-jets with
different opening angles and energies by including contributions from the
Modified LLA (MLLA) and Next-to-MLLA to the leading order QCD results.
| [
{
"created": "Mon, 7 Jul 2008 18:17:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ochs",
"Wlofgang",
"",
"MPI"
],
[
"Ramos",
"Redamy Perez",
""
]
] | We study the particle multiplicity in a jet or sub-jet as derived from an energy-multiplicity 2-particle correlation. This definition avoids the notion of a globally fixed jet axis and allows for the study of smaller jet cone openings in a more stable way. The results are sensitive to the mean color current $<C >_{A_0} $ in the jet from primary parton $A_0$ which takes into account intermediate partonic processes in the sub-jet production where $C_F< < C >_{A_0} < N_c$ at high energies. We generalize previous calculations in Leading Logarithmic Approximation (LLA). The size of the effects related to this jet axis definition are computed for multiplicities in sub-jets with different opening angles and energies by including contributions from the Modified LLA (MLLA) and Next-to-MLLA to the leading order QCD results. |
hep-ph/0110224 | Kenichiro Aoki | Kenichiro Aoki and Dimitri Kusnezov | Violations of local equilibrium and linear response in classical lattice
theories | 7pp, 4figs, talk given by KA at "Thermal field theory and
applications" workshop 2001 | Phys.Lett. A309 (2003) 377-381 | 10.1016/S0375-9601(03)00293-7 | null | hep-ph | null | We study the dynamics of $\phi^4$ theory and the FPU $\beta$ model under
thermal gradients, from first principles. We analyze quantitatively how local
equilibrium and linear response are violated, paying special care to how we
find observables that unambiguously display these violations. Relations between
these quantities to equations of state are also examined. Further, we discuss
how we can approach similar dynamical problems in continuum quantum field
theory. We analyze how close we are to obtaining the continuum results.
| [
{
"created": "Wed, 17 Oct 2001 08:04:20 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Aoki",
"Kenichiro",
""
],
[
"Kusnezov",
"Dimitri",
""
]
] | We study the dynamics of $\phi^4$ theory and the FPU $\beta$ model under thermal gradients, from first principles. We analyze quantitatively how local equilibrium and linear response are violated, paying special care to how we find observables that unambiguously display these violations. Relations between these quantities to equations of state are also examined. Further, we discuss how we can approach similar dynamical problems in continuum quantum field theory. We analyze how close we are to obtaining the continuum results. |
hep-ph/0309305 | Leonardo Rastelli | Nissan Itzhaki, Igor R. Klebanov, Peter Ouyang, and Leonardo Rastelli | Is Theta+(1540) a Kaon--Skyrmion Resonance? | 22 pages. More details on SU(2)_I excitations of Theta+, version
published on NPB | Nucl.Phys. B684 (2004) 264-280 | 10.1016/j.nuclphysb.2004.02.004 | PUPT-2097 | hep-ph | null | We reconsider the relationship between the bound state and the SU(3) rigid
rotator approaches to strangeness in the Skyrme model. For non-exotic S=-1
baryons the bound state approach matches for small m_K onto the rigid rotator
approach, and the bound state mode turns into the rotator zero-mode. However,
for small m_K, we find no S=+1 kaon bound states or resonances in the spectrum,
confirming previous work. This suggests that, at least for large N and small
m_K, the exotic state may be an artifact of the rigid rotator approach to the
Skyrme model. An S=+1 near-threshold state comes into existence only for
sufficiently large SU(3) breaking. If such a state exists, then it has the
expected quantum numbers of Theta+: I=0, J=1/2 and positive parity. Other
exotic states with (I=1, J^P=3/2+), (I=1,J^P=1/2+), (I=2, J^P=5/2+) and
(I=2,J^P=3/2+) appear as its SU(2) rotator excitations. As a test of our
methods, we also identify a D-wave S=-1 near-threshold resonance that, upon
SU(2) collective coordinate quantization, reproduces the mass splittings of the
observed states Lambda(1520), Sigma(1670) and Sigma(1775) with good accuracy.
| [
{
"created": "Fri, 26 Sep 2003 19:48:13 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Oct 2003 21:34:24 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Oct 2003 15:08:47 GMT",
"version": "v3"
},
{
"created": "Fri, 24 Oct 2003 20:25:39 GMT",
"version": "v4"
},
{
"cr... | 2010-04-05 | [
[
"Itzhaki",
"Nissan",
""
],
[
"Klebanov",
"Igor R.",
""
],
[
"Ouyang",
"Peter",
""
],
[
"Rastelli",
"Leonardo",
""
]
] | We reconsider the relationship between the bound state and the SU(3) rigid rotator approaches to strangeness in the Skyrme model. For non-exotic S=-1 baryons the bound state approach matches for small m_K onto the rigid rotator approach, and the bound state mode turns into the rotator zero-mode. However, for small m_K, we find no S=+1 kaon bound states or resonances in the spectrum, confirming previous work. This suggests that, at least for large N and small m_K, the exotic state may be an artifact of the rigid rotator approach to the Skyrme model. An S=+1 near-threshold state comes into existence only for sufficiently large SU(3) breaking. If such a state exists, then it has the expected quantum numbers of Theta+: I=0, J=1/2 and positive parity. Other exotic states with (I=1, J^P=3/2+), (I=1,J^P=1/2+), (I=2, J^P=5/2+) and (I=2,J^P=3/2+) appear as its SU(2) rotator excitations. As a test of our methods, we also identify a D-wave S=-1 near-threshold resonance that, upon SU(2) collective coordinate quantization, reproduces the mass splittings of the observed states Lambda(1520), Sigma(1670) and Sigma(1775) with good accuracy. |
2406.01209 | En Wang | Ying Li, Si-Wei Liu, En Wang, De-Min Li, Li-Sheng Geng, and Ju-Jun Xie | Theoretical study of $N(1535)$ and $\Sigma^*(1/2^-)$ in the
Cabibbo-favored process $\Lambda_c^+ \to p \bar{K}^0\eta$ | 9 pages, 5 figures, comments are welcome! | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Motivated by the recent experimental measurements, we have investigated the
Cabibbo-favored process $\Lambda_c^+ \to p \bar{K}^0\eta$, where the $N(1535)$
resonance is dynamically generated from the $S$-wave pseudoscalar meson-octet
baryon interactions within the chiral unitary approach. The contributions from
the intermediate $N(1650)$ and the predicted low-lying baryon $\Sigma^*(1/2^-)$
are also considered. In addition, a Breit-Wigner amplitude for the $N(1535)$
resonance is checked. By comparing with the measured $\eta p$, $\bar{K}^0
\eta$, and $p \bar{K}^0$ invariant mass squared distributions, our results
support the interpretation of $N(1535)$ as a dynamically generated state.
Furthermore, we demonstrate that, with the contribution from $\Sigma^*(1/2^-)$
taken into account, the calculated invariant mass spectrum agrees with the
Belle measurements. Future precise measurements of the $\Lambda_c^+\to p
\bar{K}^0\eta$ process can further elucidate the existence of the low-lying
baryon $\Sigma^*(1/2^-)$.
| [
{
"created": "Mon, 3 Jun 2024 11:21:05 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Li",
"Ying",
""
],
[
"Liu",
"Si-Wei",
""
],
[
"Wang",
"En",
""
],
[
"Li",
"De-Min",
""
],
[
"Geng",
"Li-Sheng",
""
],
[
"Xie",
"Ju-Jun",
""
]
] | Motivated by the recent experimental measurements, we have investigated the Cabibbo-favored process $\Lambda_c^+ \to p \bar{K}^0\eta$, where the $N(1535)$ resonance is dynamically generated from the $S$-wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach. The contributions from the intermediate $N(1650)$ and the predicted low-lying baryon $\Sigma^*(1/2^-)$ are also considered. In addition, a Breit-Wigner amplitude for the $N(1535)$ resonance is checked. By comparing with the measured $\eta p$, $\bar{K}^0 \eta$, and $p \bar{K}^0$ invariant mass squared distributions, our results support the interpretation of $N(1535)$ as a dynamically generated state. Furthermore, we demonstrate that, with the contribution from $\Sigma^*(1/2^-)$ taken into account, the calculated invariant mass spectrum agrees with the Belle measurements. Future precise measurements of the $\Lambda_c^+\to p \bar{K}^0\eta$ process can further elucidate the existence of the low-lying baryon $\Sigma^*(1/2^-)$. |
hep-ph/0401053 | Arata Hayashigaki | Arata Hayashigaki and Kazuhiro Tanaka | Transverse quark motion inside charmonia in diffractive photo- and
electroproductions | REVTeX4 17 pages, 14 figures | null | null | null | hep-ph nucl-th | null | We reexamine the Fermi motion effects on the diffractive photo- and
electroproductions of heavy vector-mesons, J/psi and psi', off a nucleon in the
leading ln(Q^2/Lambda_QCD^2) approximation (LLA) of QCD. We take into account
all the Fermi motion corrections arising from the relative motion of quarks
inside the charmonium, which is treated as a nonrelativistic bound state of c
and \bar{c}. Our key ingredients are the correct spin structure for the ^3S_1
c\bar{c} bound state, the off-shellness in the c\bar{c} \to J/psi (psi')
hadronization vertex, and the modification of the gluon's longitudinal momentum
fraction probed by the process, due to the relative motion between c and
\bar{c}. We demonstrate that these three contributions produce the new Fermi
motion effects in the LLA diffractive amplitude in QCD. It is found that our
new effects moderate the strong suppression of the diffractive J/psi (psi')
production cross sections, which was reported in the previous works on the
Fermi motion effects. We emphasize the role of the transverse quark motion for
the heavy meson production, and also discuss the strong helicity dependence of
the Fermi motion effects and its implication in the longitudinal to transverse
production ratio, sigma_L/sigma_T.
| [
{
"created": "Fri, 9 Jan 2004 16:10:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hayashigaki",
"Arata",
""
],
[
"Tanaka",
"Kazuhiro",
""
]
] | We reexamine the Fermi motion effects on the diffractive photo- and electroproductions of heavy vector-mesons, J/psi and psi', off a nucleon in the leading ln(Q^2/Lambda_QCD^2) approximation (LLA) of QCD. We take into account all the Fermi motion corrections arising from the relative motion of quarks inside the charmonium, which is treated as a nonrelativistic bound state of c and \bar{c}. Our key ingredients are the correct spin structure for the ^3S_1 c\bar{c} bound state, the off-shellness in the c\bar{c} \to J/psi (psi') hadronization vertex, and the modification of the gluon's longitudinal momentum fraction probed by the process, due to the relative motion between c and \bar{c}. We demonstrate that these three contributions produce the new Fermi motion effects in the LLA diffractive amplitude in QCD. It is found that our new effects moderate the strong suppression of the diffractive J/psi (psi') production cross sections, which was reported in the previous works on the Fermi motion effects. We emphasize the role of the transverse quark motion for the heavy meson production, and also discuss the strong helicity dependence of the Fermi motion effects and its implication in the longitudinal to transverse production ratio, sigma_L/sigma_T. |
1212.3249 | Stefan Liebler | Robert V. Harlander, Stefan Liebler, Hendrik Mantler | SusHi: A program for the calculation of Higgs production in gluon fusion
and bottom-quark annihilation in the Standard Model and the MSSM | 28 pages, 4 figures; v2: typos corrected, reference added, version
published in CPC | Computer Physics Communications 184 (2013) pp. 1605-1617 | 10.1016/j.cpc.2013.02.006 | WUB/12-28, LPN12-134 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article describes the code SusHi (for "Supersymmetric Higgs") which
calculates the cross sections $pp/p\bar{p}\rightarrow\phi+X$ in gluon fusion
and bottom-quark annihilation in the SM and the MSSM, where $\phi$ is any of
the neutral Higgs bosons within these models. Apart from inclusive cross
sections up to NNLO QCD, differential cross sections with respect to the Higgs'
transverse momentum $p_T$ and (pseudo-)rapidity $y(\eta)$ can be calculated
through NLO QCD. In case of gluon fusion, SusHi contains NLO QCD contributions
from the third family of quarks and squarks, NNLO corrections due to
top-quarks, approximate NNLO corrections due to top-squarks, and electro-weak
effects. It supports various renormalization schemes for the sbottom sector and
the bottom Yukawa coupling, as well as resummation effects of higher order
$\tan\beta$-enhanced sbottom contributions. SusHi provides a link to FeynHiggs
for the calculation of the Higgs masses.
| [
{
"created": "Thu, 13 Dec 2012 18:16:23 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2013 17:00:49 GMT",
"version": "v2"
}
] | 2013-03-20 | [
[
"Harlander",
"Robert V.",
""
],
[
"Liebler",
"Stefan",
""
],
[
"Mantler",
"Hendrik",
""
]
] | This article describes the code SusHi (for "Supersymmetric Higgs") which calculates the cross sections $pp/p\bar{p}\rightarrow\phi+X$ in gluon fusion and bottom-quark annihilation in the SM and the MSSM, where $\phi$ is any of the neutral Higgs bosons within these models. Apart from inclusive cross sections up to NNLO QCD, differential cross sections with respect to the Higgs' transverse momentum $p_T$ and (pseudo-)rapidity $y(\eta)$ can be calculated through NLO QCD. In case of gluon fusion, SusHi contains NLO QCD contributions from the third family of quarks and squarks, NNLO corrections due to top-quarks, approximate NNLO corrections due to top-squarks, and electro-weak effects. It supports various renormalization schemes for the sbottom sector and the bottom Yukawa coupling, as well as resummation effects of higher order $\tan\beta$-enhanced sbottom contributions. SusHi provides a link to FeynHiggs for the calculation of the Higgs masses. |
1311.7173 | Piero Nicolini | Antonia M. Frassino, Piero Nicolini and Orlando Panella | Unparticle Casimir effect | 13 pages, 3 figures; v2: improved discussion, additional references,
v3: title slightly changed, version matching that in press on Physics Letters
B | Physics Letters B 772 (2017) 675--680 | 10.1016/j.physletb.2017.07.029 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present the un-Casimir effect, namely the study of the
Casimir energy in the presence of an unparticle component in addition to the
electromagnetic field contribution. The distinctive feature of the un-Casimir
effect is a fractalization of metallic plates. This result emerges through a
new dependence of the Casimir energy on the plate separation that scales with a
continuous power controlled by the unparticle dimension. As long as the perfect
conductor approximation is valid, we find bounds on the unparticle scale that
are independent of the effective coupling constant between the scale invariant
sector and ordinary matter. We find regions of the parameter space such that
for plate distances around $5\mu$m and larger the un-Casimir bound wins over
the other bounds.
| [
{
"created": "Wed, 27 Nov 2013 23:01:15 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2014 21:00:30 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jul 2017 21:04:08 GMT",
"version": "v3"
}
] | 2017-07-27 | [
[
"Frassino",
"Antonia M.",
""
],
[
"Nicolini",
"Piero",
""
],
[
"Panella",
"Orlando",
""
]
] | In this paper we present the un-Casimir effect, namely the study of the Casimir energy in the presence of an unparticle component in addition to the electromagnetic field contribution. The distinctive feature of the un-Casimir effect is a fractalization of metallic plates. This result emerges through a new dependence of the Casimir energy on the plate separation that scales with a continuous power controlled by the unparticle dimension. As long as the perfect conductor approximation is valid, we find bounds on the unparticle scale that are independent of the effective coupling constant between the scale invariant sector and ordinary matter. We find regions of the parameter space such that for plate distances around $5\mu$m and larger the un-Casimir bound wins over the other bounds. |
hep-ph/0406276 | Shevchenko | V.I.Shevchenko, Yu.A.Simonov (ITEP) | Current correlators in QCD: OPE versus large distance dynamics | LaTeX, 25 pages, 13 figures | Phys.Rev. D70 (2004) 074012 | 10.1103/PhysRevD.70.074012 | null | hep-ph | null | We analyse the structure of current-current correlators in coordinate space
in large $N_c$ limit when the corresponding spectral density takes the form of
an infinite sum over hadron poles. The latter are computed in the QCD string
model with quarks at the ends, including the lowest states, for all channels.
The corresponding correlators demonstrate reasonable qualitative agreement with
the lattice data without any additional fits. Different issues concerning the
structure of the short distance OPE are discussed.
| [
{
"created": "Thu, 24 Jun 2004 14:50:31 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Shevchenko",
"V. I.",
"",
"ITEP"
],
[
"Simonov",
"Yu. A.",
"",
"ITEP"
]
] | We analyse the structure of current-current correlators in coordinate space in large $N_c$ limit when the corresponding spectral density takes the form of an infinite sum over hadron poles. The latter are computed in the QCD string model with quarks at the ends, including the lowest states, for all channels. The corresponding correlators demonstrate reasonable qualitative agreement with the lattice data without any additional fits. Different issues concerning the structure of the short distance OPE are discussed. |
1603.06664 | Huey-Wen Lin | Jiunn-Wei Chen, Saul D. Cohen, Xiangdong Ji, Huey-Wen Lin, and
Jian-Hui Zhang | Nucleon Helicity and Transversity Parton Distributions from Lattice QCD | 21 pages, 6 figures | null | 10.1016/j.nuclphysb.2016.07.033 | MIT-CTP/4776,INT-PUB-16-009 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first lattice-QCD calculation of the isovector polarized
parton distribution functions (both helicity and transversity) using the
large-momentum effective field theory (LaMET) approach for direct Bjorken-$x$
dependence. We first review the detailed steps of the procedure in the
unpolarized case, then generalize to the helicity and transversity cases. We
also derive a new mass-correction formulation for all three cases. We then
compare the effects of each finite-momentum correction using lattice data
calculated at $M_\pi\approx 310$ MeV. Finally, we discuss the implications of
these results for the poorly known antiquark structure and predict the
sea-flavor asymmetry in the transversely polarized nucleon.
| [
{
"created": "Tue, 22 Mar 2016 02:53:42 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Chen",
"Jiunn-Wei",
""
],
[
"Cohen",
"Saul D.",
""
],
[
"Ji",
"Xiangdong",
""
],
[
"Lin",
"Huey-Wen",
""
],
[
"Zhang",
"Jian-Hui",
""
]
] | We present the first lattice-QCD calculation of the isovector polarized parton distribution functions (both helicity and transversity) using the large-momentum effective field theory (LaMET) approach for direct Bjorken-$x$ dependence. We first review the detailed steps of the procedure in the unpolarized case, then generalize to the helicity and transversity cases. We also derive a new mass-correction formulation for all three cases. We then compare the effects of each finite-momentum correction using lattice data calculated at $M_\pi\approx 310$ MeV. Finally, we discuss the implications of these results for the poorly known antiquark structure and predict the sea-flavor asymmetry in the transversely polarized nucleon. |
0712.4053 | Mayumi Aoki | Mayumi Aoki (Tokyo U., ICRR), Shinya Kanemura (Toyama U.) | Unitarity bounds in the Higgs model including triplet fields with
custodial symmetry | 1+15 pages, Version to be published in Phys. Rev. D | Phys.Rev.D77:095009,2008 | 10.1103/PhysRevD.77.095009 | null | hep-ph | null | We study bounds on Higgs boson masses from perturbative unitarity in the
Georgi-Machacek model, whose Higgs sector is composed of a scalar isospin
doublet, a real and a complex isospin triplet fields. This model can be
compatible with the electroweak precision data without fine tuning because of
the imposed global SU(2)_R symmetry in the Higgs potential, by which the
electroweak rho parameter is unity at the tree level. All possible two-body
elastic-scattering channels are taken into account to evaluate the S-wave
amplitude matrix, and then the condition of perturbative unitarity is imposed
on the eigenvalues to obtain constraint on the Higgs parameters. Masses of all
scalar bosons turn out to be bounded from above, some of which receive more
strict upper bounds as compared to that in the standard model (712 GeV). In
particular, the upper bound of the lightest scalar boson, whatever it would be,
is about 270 GeV.
| [
{
"created": "Tue, 25 Dec 2007 08:51:00 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2008 06:09:42 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Aoki",
"Mayumi",
"",
"Tokyo U., ICRR"
],
[
"Kanemura",
"Shinya",
"",
"Toyama U."
]
] | We study bounds on Higgs boson masses from perturbative unitarity in the Georgi-Machacek model, whose Higgs sector is composed of a scalar isospin doublet, a real and a complex isospin triplet fields. This model can be compatible with the electroweak precision data without fine tuning because of the imposed global SU(2)_R symmetry in the Higgs potential, by which the electroweak rho parameter is unity at the tree level. All possible two-body elastic-scattering channels are taken into account to evaluate the S-wave amplitude matrix, and then the condition of perturbative unitarity is imposed on the eigenvalues to obtain constraint on the Higgs parameters. Masses of all scalar bosons turn out to be bounded from above, some of which receive more strict upper bounds as compared to that in the standard model (712 GeV). In particular, the upper bound of the lightest scalar boson, whatever it would be, is about 270 GeV. |
1609.02386 | Alexei Smirnov Yu | A. Yu. Smirnov | Solar neutrinos: Oscillations or No-oscillations? | 19 pages, 12 figures, Comments and 1 figure added | null | null | null | hep-ph astro-ph.SR hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Nobel prize in physics 2015 has been awarded "... for the discovery of
neutrino oscillations which show that neutrinos have mass". While
SuperKamiokande (SK), indeed, has discovered oscillations, SNO observed effect
of the adiabatic (almost non-oscillatory) flavor conversion of neutrinos in the
matter of the Sun. Oscillations are irrelevant for solar neutrinos apart from
small $\nu_e$ regeneration inside the Earth. Both oscillations and adiabatic
conversion do not imply masses uniquely and further studies were required to
show that non-zero neutrino masses are behind the SNO results. Phenomena of
oscillations (phase effect) and adiabatic conversion (the MSW effect driven by
the change of mixing in matter) are described in pedagogical way.
| [
{
"created": "Thu, 8 Sep 2016 11:56:07 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2017 11:51:10 GMT",
"version": "v2"
}
] | 2017-09-20 | [
[
"Smirnov",
"A. Yu.",
""
]
] | The Nobel prize in physics 2015 has been awarded "... for the discovery of neutrino oscillations which show that neutrinos have mass". While SuperKamiokande (SK), indeed, has discovered oscillations, SNO observed effect of the adiabatic (almost non-oscillatory) flavor conversion of neutrinos in the matter of the Sun. Oscillations are irrelevant for solar neutrinos apart from small $\nu_e$ regeneration inside the Earth. Both oscillations and adiabatic conversion do not imply masses uniquely and further studies were required to show that non-zero neutrino masses are behind the SNO results. Phenomena of oscillations (phase effect) and adiabatic conversion (the MSW effect driven by the change of mixing in matter) are described in pedagogical way. |
1709.08649 | Ambresh Shivaji | Fabio Maltoni, Davide Pagani, Ambresh Shivaji, Xiaoran Zhao | Trilinear Higgs coupling determination via single-Higgs differential
measurements at the LHC | 31 pages, 15 figures, 5 tables; Matches the journal version | Eur. Phys. J. C (2017) 77: 887 | 10.1140/epjc/s10052-017-5410-8 | CP3-17-37, TUM-HEP-1099/17, MCnet-17-18 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study one-loop effects induced by an anomalous Higgs trilinear coupling on
total and differential rates for the $H\to 4\ell$ decay and some of the main
single-Higgs production channels at the LHC, namely, VBF, $VH$, $t\bar tH$ and
$tHj$. Our results are based on a public code that calculates these effects by
simply reweighting samples of Standard-Model-like events for a given production
channel. For $VH$ and $t\bar tH$ production, where differential effects are
particularly relevant, we include Standard Model electroweak corrections, which
have similar sizes but different kinematic dependences. Finally, we study the
sensitivity of future LHC runs to determine the trilinear coupling via
inclusive and differential measurements, considering also the case where the
Higgs couplings to vector bosons and the top quark is affected by new physics.
We find that the constraints on the couplings and the relevance of differential
distributions critically depend on the expected experimental and theoretical
uncertainties.
| [
{
"created": "Mon, 25 Sep 2017 18:01:33 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2018 22:51:06 GMT",
"version": "v2"
}
] | 2018-02-08 | [
[
"Maltoni",
"Fabio",
""
],
[
"Pagani",
"Davide",
""
],
[
"Shivaji",
"Ambresh",
""
],
[
"Zhao",
"Xiaoran",
""
]
] | We study one-loop effects induced by an anomalous Higgs trilinear coupling on total and differential rates for the $H\to 4\ell$ decay and some of the main single-Higgs production channels at the LHC, namely, VBF, $VH$, $t\bar tH$ and $tHj$. Our results are based on a public code that calculates these effects by simply reweighting samples of Standard-Model-like events for a given production channel. For $VH$ and $t\bar tH$ production, where differential effects are particularly relevant, we include Standard Model electroweak corrections, which have similar sizes but different kinematic dependences. Finally, we study the sensitivity of future LHC runs to determine the trilinear coupling via inclusive and differential measurements, considering also the case where the Higgs couplings to vector bosons and the top quark is affected by new physics. We find that the constraints on the couplings and the relevance of differential distributions critically depend on the expected experimental and theoretical uncertainties. |
1011.5154 | Paula Tuzon | Martin Jung, Antonio Pich and Paula Tuz\'on | The B -> Xs gamma Rate and CP Asymmetry within the Aligned
Two-Higgs-Doublet Model | 12 pages, 6 figures. Submitted to Phys.Rev.D | Phys.Rev.D83:074011,2011 | 10.1103/PhysRevD.83.074011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the two-Higgs-doublet model the alignment of the Yukawa matrices in
flavour space guarantees the absence of flavour-changing neutral currents at
tree level, while introducing new sources for CP violation parametrized in a
very economical way. This implies potentially large influence in a number of
processes, b -> s gamma being a prominent example where rather high
experimental and theoretical precision meet. We analyze the CP rate asymmetry
in this inclusive decay and determine the resulting constraints on the model
parameters. We demonstrate the compatibility with previously obtained limits.
Moreover we extend the phenomenological analysis of the branching ratio, and
examine the influence of resulting correlations on the like-sign dimuon charge
asymmetry in B decays.
| [
{
"created": "Tue, 23 Nov 2010 16:39:01 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2010 19:42:03 GMT",
"version": "v2"
}
] | 2011-04-22 | [
[
"Jung",
"Martin",
""
],
[
"Pich",
"Antonio",
""
],
[
"Tuzón",
"Paula",
""
]
] | In the two-Higgs-doublet model the alignment of the Yukawa matrices in flavour space guarantees the absence of flavour-changing neutral currents at tree level, while introducing new sources for CP violation parametrized in a very economical way. This implies potentially large influence in a number of processes, b -> s gamma being a prominent example where rather high experimental and theoretical precision meet. We analyze the CP rate asymmetry in this inclusive decay and determine the resulting constraints on the model parameters. We demonstrate the compatibility with previously obtained limits. Moreover we extend the phenomenological analysis of the branching ratio, and examine the influence of resulting correlations on the like-sign dimuon charge asymmetry in B decays. |
hep-ph/0403078 | Yue-Liang Wu | Y.B Zuo, Y.a Yan, Y.L Wu and W.Y Wang | Lifetime Difference and Endpoint effect in the Inclusive Bottom Hadron
Decays | 11 pages, Revtex, 10 figures, 6 tables, published version | Int.J.Mod.Phys. A19 (2004) 3685-3706 | 10.1142/S0217751X04018476 | null | hep-ph | null | The lifetime differences of bottom hadrons are known to be properly explained
within the framework of heavy quark effective field theory(HQEFT) of QCD via
the inverse expansion of the dressed heavy quark mass. In general, the spectrum
around the endpoint region is not well behaved due to the invalidity of $1/m_Q$
expansion near the endpoint. The curve fitting method is adopted to treat the
endpoint behavior. It turns out that the endpoint effects are truly small and
the explanation on the lifetime differences in the HQEFT of QCD is then well
justified. The inclusion of the endpoint effects makes the prediction on the
lifetime differences and the extraction on the CKM matrix element $|V_{cb}|$
more reliable.
| [
{
"created": "Mon, 8 Mar 2004 06:55:41 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Zuo",
"Y. B",
""
],
[
"Yan",
"Y. a",
""
],
[
"Wu",
"Y. L",
""
],
[
"Wang",
"W. Y",
""
]
] | The lifetime differences of bottom hadrons are known to be properly explained within the framework of heavy quark effective field theory(HQEFT) of QCD via the inverse expansion of the dressed heavy quark mass. In general, the spectrum around the endpoint region is not well behaved due to the invalidity of $1/m_Q$ expansion near the endpoint. The curve fitting method is adopted to treat the endpoint behavior. It turns out that the endpoint effects are truly small and the explanation on the lifetime differences in the HQEFT of QCD is then well justified. The inclusion of the endpoint effects makes the prediction on the lifetime differences and the extraction on the CKM matrix element $|V_{cb}|$ more reliable. |
1601.06394 | Cheng-Wei Chiang | Cheng-Wei Chiang and An-Li Kuo | Can the 750-GeV diphoton resonance be the singlet Higgs boson of
custodial Higgs triplet model? | 14 pages, 2 figures, and 2 tables; bugs in numerical calculations
fixed, and discussions and conclusions changed; typo corrected; 16 pages,
expanded with more detailed discussions, updated figures and tables, version
to appear in the journal | null | 10.1016/j.physletb.2016.07.045 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of diphoton excess around the mass of 750 GeV in LHC Run-II
motivates us to consider whether the singlet Higgs boson in the custodial Higgs
triplet model can serve as a good candidate because an earlier study of
comprehensive parameter scan shows that it can have the right mass in the
viable mass spectra. By assuming the singlet Higgs mass at 750 GeV, its total
width less than 50 GeV and imposing constraints from the LHC 8-TeV data, we
identify an approximately linear region on the $(v_\Delta, \alpha)$ plane along
which the exotic Higgs boson masses satisfy a specific hierarchy and have lower
possible spectra, where $v_\Delta$ denotes the triplet vacuum expectation value
and $\alpha$ is the mixing angle between the singlet Higgs boson and the
standard model-like Higgs boson. Although the diphoton decay rate can be
enhanced by charged Higgs bosons running in the loop in this region, it is
mostly orders of magnitude smaller than that required for the observed
production rate, except for the small $v_\Delta$ region when the diphoton
fusion production mechanism becomes dominant. Nonetheless, this part of
parameter space suffers from the problems of breakdown of perturbativity and
large uncertainties in the photon parton distribution function of proton.
| [
{
"created": "Sun, 24 Jan 2016 15:15:15 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2016 09:15:52 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Feb 2016 09:34:25 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Jul 2016 05:12:22 GMT",
"version": "v4"
}
] | 2016-07-27 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Kuo",
"An-Li",
""
]
] | The observation of diphoton excess around the mass of 750 GeV in LHC Run-II motivates us to consider whether the singlet Higgs boson in the custodial Higgs triplet model can serve as a good candidate because an earlier study of comprehensive parameter scan shows that it can have the right mass in the viable mass spectra. By assuming the singlet Higgs mass at 750 GeV, its total width less than 50 GeV and imposing constraints from the LHC 8-TeV data, we identify an approximately linear region on the $(v_\Delta, \alpha)$ plane along which the exotic Higgs boson masses satisfy a specific hierarchy and have lower possible spectra, where $v_\Delta$ denotes the triplet vacuum expectation value and $\alpha$ is the mixing angle between the singlet Higgs boson and the standard model-like Higgs boson. Although the diphoton decay rate can be enhanced by charged Higgs bosons running in the loop in this region, it is mostly orders of magnitude smaller than that required for the observed production rate, except for the small $v_\Delta$ region when the diphoton fusion production mechanism becomes dominant. Nonetheless, this part of parameter space suffers from the problems of breakdown of perturbativity and large uncertainties in the photon parton distribution function of proton. |
hep-ph/9604275 | Jerry Franklin | Jerrold Franklin | Application of Sum rules to heavy baryon masses | 5 pages Latex. The replacement clarifies the discussion on the first
two pages | Phys.Rev. D55 (1997) 423-424 | 10.1103/PhysRevD.55.423 | TUHE-9641 | hep-ph | null | Model independent sum rules are applied to recent measurements of heavy
c-baryon and d-baryon masses. The sum rules are generally satisfied to the same
degree as for the light (u,d,s) baryons.
| [
{
"created": "Tue, 9 Apr 1996 18:18:07 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 1996 17:58:03 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Franklin",
"Jerrold",
""
]
] | Model independent sum rules are applied to recent measurements of heavy c-baryon and d-baryon masses. The sum rules are generally satisfied to the same degree as for the light (u,d,s) baryons. |
2211.08885 | Anderson Kohara | Anderson Kendi Kohara | Observation of two zeros of the real amplitude in pp scattering at LHC
energies | 4 pages and 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Elastic scattering of charged hadrons is described by the combination of
nuclear and Coulomb amplitudes. It is well know that at the very forward range
the nuclear real and Coulomb parts interplay a crucial role in the
determination of the magnitude of the real part at $|t|=0$. However, beyond
$|t|=0$ the real and imaginary nuclear amplitudes have different $t$
dependencies and we show that at LHC energies the zeros formed by the
combination $T_C(t)+T_R^N(s,t)=0$ in pp process can be potentially observed
when the background due to the imaginary part is removed. This observation
constrains the real part at this forward range.
| [
{
"created": "Wed, 16 Nov 2022 12:47:44 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2023 08:40:47 GMT",
"version": "v2"
}
] | 2023-01-18 | [
[
"Kohara",
"Anderson Kendi",
""
]
] | Elastic scattering of charged hadrons is described by the combination of nuclear and Coulomb amplitudes. It is well know that at the very forward range the nuclear real and Coulomb parts interplay a crucial role in the determination of the magnitude of the real part at $|t|=0$. However, beyond $|t|=0$ the real and imaginary nuclear amplitudes have different $t$ dependencies and we show that at LHC energies the zeros formed by the combination $T_C(t)+T_R^N(s,t)=0$ in pp process can be potentially observed when the background due to the imaginary part is removed. This observation constrains the real part at this forward range. |
hep-ph/9507421 | Lev F. M. | Felix M. Lev | Effect of Binding in Deep Inelastic Scattering Revisited | 41 pages. The revised version is self-contained and additional
arguments that perturbative QCD does not apply to DIS are given | null | null | null | hep-ph | null | In the Bjorken limit of the present theory of deep inelastic scattering (DIS)
the structure functions (up to anomalous dimensions and perturbative QCD
corrections) are described by the parton model. However the current operator in
the parton model does not properly commute with the representation operators
corresponding to the Lorentz group, space reflection and time reversal. To
investigate the violation of these symmetries in the parton model we consider a
model in which the current operator explicitly satisfies extended Poincare
invariance and current conservation. It is shown that due to binding of quarks
in the nucleon the Bjorken variable x no longer can be interpreted as the
internal light cone momentum fraction $\xi$ even in the Bjorken limit. As a
result, the data on DIS alone do not make it possible to determine the $\xi$
distribution of quarks in the nucleon. We also consider a qualitative
explanation of the fact that in the parton model the values given by the sum
rules exceed the corresponding experimental quantities while the quark
contribution to the nucleon momentum and spin is underestimated.
| [
{
"created": "Wed, 26 Jul 1995 11:53:35 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 1996 13:10:14 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Lev",
"Felix M.",
""
]
] | In the Bjorken limit of the present theory of deep inelastic scattering (DIS) the structure functions (up to anomalous dimensions and perturbative QCD corrections) are described by the parton model. However the current operator in the parton model does not properly commute with the representation operators corresponding to the Lorentz group, space reflection and time reversal. To investigate the violation of these symmetries in the parton model we consider a model in which the current operator explicitly satisfies extended Poincare invariance and current conservation. It is shown that due to binding of quarks in the nucleon the Bjorken variable x no longer can be interpreted as the internal light cone momentum fraction $\xi$ even in the Bjorken limit. As a result, the data on DIS alone do not make it possible to determine the $\xi$ distribution of quarks in the nucleon. We also consider a qualitative explanation of the fact that in the parton model the values given by the sum rules exceed the corresponding experimental quantities while the quark contribution to the nucleon momentum and spin is underestimated. |
0707.3342 | S. Weinzierl | Stefan Weinzierl | Automated calculations for multi-leg processes | 43 pages, plenary talk given at the ACAT 07 conference, Amsterdam,
2007; v2: references added | PoS ACAT:005,2007 | null | null | hep-ph | null | The search for signals of new physics at the forthcoming LHC experiments
involves the analysis of final states characterised by a high number of
hadronic jets or identified particles. Precise theoretical predictions for
these processes require the computation of scattering amplitudes with a large
number of external particles and beyond leading order in perturbation theory.
The complexity of a calculation grows with the number of internal loops as well
as with the number of external legs. Automatisation of at least next-to-leading
order calculations for LHC processes is therefore a timely task. I will discuss
various approaches.
| [
{
"created": "Mon, 23 Jul 2007 09:26:46 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2007 12:07:13 GMT",
"version": "v2"
}
] | 2009-04-16 | [
[
"Weinzierl",
"Stefan",
""
]
] | The search for signals of new physics at the forthcoming LHC experiments involves the analysis of final states characterised by a high number of hadronic jets or identified particles. Precise theoretical predictions for these processes require the computation of scattering amplitudes with a large number of external particles and beyond leading order in perturbation theory. The complexity of a calculation grows with the number of internal loops as well as with the number of external legs. Automatisation of at least next-to-leading order calculations for LHC processes is therefore a timely task. I will discuss various approaches. |
0802.1209 | Hanqing Zheng | Hanqing Zheng | Low Lying Scalar Resonances and Chiral Symmetry | Invited plenary talk given at CHIRAL 2007, Nov. 13-16, 2007, RCNP,
Osaka, Japan | Mod.Phys.Lett.A23:2218-2225,2008 | 10.1142/S021773230802906X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current theoretical studies on the $\sigma$ and $\kappa$ resonances are
reviewed. It is emphasized that all evidences accumulated so far are consistent
with the picture that the $\sigma$ meson is the chiral partner of the
Nambu--Goldstone bosons in a linear realization of chiral symmetry.
| [
{
"created": "Fri, 8 Feb 2008 20:52:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zheng",
"Hanqing",
""
]
] | Current theoretical studies on the $\sigma$ and $\kappa$ resonances are reviewed. It is emphasized that all evidences accumulated so far are consistent with the picture that the $\sigma$ meson is the chiral partner of the Nambu--Goldstone bosons in a linear realization of chiral symmetry. |
1411.2780 | Jambul Gegelia | J. Gegelia, U.-G. Mei{\ss}ner | Properties of effective massive Yang-Mills theory in the limit of
vanishing vector boson mass | 12 pages, 4 figures | null | 10.1140/epja/i2014-14174-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-loop corrections to the pole mass of the vector boson and the pole masses
and the magnetic moments of fermions are calculated in the framework of an
effective field theory of massive Yang-Mills fields interacting with fermions.
It is shown that the limit of vanishing vector boson mass is finite for all
these quantities. Implications of the obtained results are discussed.
| [
{
"created": "Tue, 11 Nov 2014 12:36:43 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Gegelia",
"J.",
""
],
[
"Meißner",
"U. -G.",
""
]
] | Two-loop corrections to the pole mass of the vector boson and the pole masses and the magnetic moments of fermions are calculated in the framework of an effective field theory of massive Yang-Mills fields interacting with fermions. It is shown that the limit of vanishing vector boson mass is finite for all these quantities. Implications of the obtained results are discussed. |
2009.07193 | Zhun Lu | Hui Li, Xiaoyu Wang, Yongliang Yang, Zhun Lu | The transverse polarization of $\Lambda$ hyperons in
$e^+e^-\to\Lambda^\uparrow h X$ processes within TMD factorization | Title changed | Eur.Phys.J. C81 (2021) no.4, 289 | 10.1140/epjc/s10052-021-09064-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the transverse polarization of the $\Lambda$ hyperon in the
processes $e^+e^-\to\Lambda^\uparrow \pi^\pm X$ and $e^+e^-\to\Lambda^\uparrow
K^\pm X$ within the framework of the transverse momentum dependent~(TMD)
factorization. The transverse polarization is contributed by the convolution of
the transversely polarizing fragmentation function~(PFF) $D_{1T}^\perp$ of the
lambda hyperon and the unpolarized fragmentation function $D_1$ of pion/kaon.
We adopt the spectator diquark model result for $D_{1T}^{\perp}$ to numerically
estimate the transverse polarization in $e^+e^-\to\Lambda^\uparrow h X$ process
at the kinematical region of Belle Collaboration. To implement the TMD
evolution formalism of the fragmentation functions, we apply two different
parametrizations on the nonperturbative Sudakov form factors associated with
the fragmentation functions of the $\Lambda$, pion and kaon. It is found that
our prediction on the polarization in the $\Lambda \pi^+$ production and
$\bar{\Lambda} \pi^-$ is consistent with the recent Belle measurement in size
and sign, while the model predictions on the polarizations in $\Lambda\pi^-$
and $\Lambda K^\pm$ productions show strong disagreement with the Belle data.
The reason for the discrepancies is discussed and possible approaches to
improve the calculation in the future are also discussed.
| [
{
"created": "Tue, 15 Sep 2020 16:01:30 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2021 02:28:39 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Apr 2021 12:32:40 GMT",
"version": "v3"
}
] | 2021-04-26 | [
[
"Li",
"Hui",
""
],
[
"Wang",
"Xiaoyu",
""
],
[
"Yang",
"Yongliang",
""
],
[
"Lu",
"Zhun",
""
]
] | We investigate the transverse polarization of the $\Lambda$ hyperon in the processes $e^+e^-\to\Lambda^\uparrow \pi^\pm X$ and $e^+e^-\to\Lambda^\uparrow K^\pm X$ within the framework of the transverse momentum dependent~(TMD) factorization. The transverse polarization is contributed by the convolution of the transversely polarizing fragmentation function~(PFF) $D_{1T}^\perp$ of the lambda hyperon and the unpolarized fragmentation function $D_1$ of pion/kaon. We adopt the spectator diquark model result for $D_{1T}^{\perp}$ to numerically estimate the transverse polarization in $e^+e^-\to\Lambda^\uparrow h X$ process at the kinematical region of Belle Collaboration. To implement the TMD evolution formalism of the fragmentation functions, we apply two different parametrizations on the nonperturbative Sudakov form factors associated with the fragmentation functions of the $\Lambda$, pion and kaon. It is found that our prediction on the polarization in the $\Lambda \pi^+$ production and $\bar{\Lambda} \pi^-$ is consistent with the recent Belle measurement in size and sign, while the model predictions on the polarizations in $\Lambda\pi^-$ and $\Lambda K^\pm$ productions show strong disagreement with the Belle data. The reason for the discrepancies is discussed and possible approaches to improve the calculation in the future are also discussed. |
hep-ph/9904395 | Jose Espinosa | J. A. Casas, J. R. Espinosa, A. Ibarra and I. Navarro | Naturalness of nearly degenerate neutrinos | 25 pages, LaTeX, 6 ps figures, psfig.sty. Typos, references and minor
details corrected. Additional condition for the MSW mechanism incorporated.
New viable textures added | Nucl.Phys. B556 (1999) 3-22 | 10.1016/S0550-3213(99)00383-1 | null | hep-ph | null | If neutrinos are to play a relevant cosmological role, they must be
essentially degenerate. We study whether radiative corrections can or cannot be
responsible for the small mass splittings, in agreement with all the available
experimental data. We perform an exhaustive exploration of the bimaximal mixing
scenario, finding that (i) the vacuum oscillations solution to the solar
neutrino problem is always excluded; (ii) if the mass matrix is produced by a
see-saw mechanism, there are large regions of the parameter space consistent
with the large angle MSW solution, providing a natural origin for the $\Delta
m^2_{sol} << \Delta m^2_{atm}$ hierarchy; (iii) the bimaximal structure becomes
then stable under radiative corrections. We also provide analytical expressions
for the mass splittings and mixing angles and present a particularly simple
see-saw ansatz consistent with all observations.
| [
{
"created": "Mon, 19 Apr 1999 17:49:20 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 1999 17:07:08 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Casas",
"J. A.",
""
],
[
"Espinosa",
"J. R.",
""
],
[
"Ibarra",
"A.",
""
],
[
"Navarro",
"I.",
""
]
] | If neutrinos are to play a relevant cosmological role, they must be essentially degenerate. We study whether radiative corrections can or cannot be responsible for the small mass splittings, in agreement with all the available experimental data. We perform an exhaustive exploration of the bimaximal mixing scenario, finding that (i) the vacuum oscillations solution to the solar neutrino problem is always excluded; (ii) if the mass matrix is produced by a see-saw mechanism, there are large regions of the parameter space consistent with the large angle MSW solution, providing a natural origin for the $\Delta m^2_{sol} << \Delta m^2_{atm}$ hierarchy; (iii) the bimaximal structure becomes then stable under radiative corrections. We also provide analytical expressions for the mass splittings and mixing angles and present a particularly simple see-saw ansatz consistent with all observations. |
hep-ph/9708232 | Peter Gosdzinsky | J. Bijnens, P. Gosdzinsky and P. Talavera | Matching the Heavy Vector Meson Theory | 11 pages, 2 figures, revtex | JHEP 9801:014,1998 | 10.1088/1126-6708/1998/01/014 | LU TP 97/16; NORDITA-97/50 N/P | hep-ph | null | We show how to obtain a ``heavy'' meson effective lagrangian for the case
where the number of heavy particles is not conserved. We apply the method in a
simple example at tree level and perform then the reduction for the case of
vector mesons in Chiral Perturbation Theory in a manifestly chiral invariant
fashion. Some examples showing that ``heavy'' meson effective theory also works
at the one-loop level are included.
| [
{
"created": "Mon, 4 Aug 1997 14:09:48 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Bijnens",
"J.",
""
],
[
"Gosdzinsky",
"P.",
""
],
[
"Talavera",
"P.",
""
]
] | We show how to obtain a ``heavy'' meson effective lagrangian for the case where the number of heavy particles is not conserved. We apply the method in a simple example at tree level and perform then the reduction for the case of vector mesons in Chiral Perturbation Theory in a manifestly chiral invariant fashion. Some examples showing that ``heavy'' meson effective theory also works at the one-loop level are included. |
1906.09475 | Sandeep Joshi | Sandeep Joshi, Sudhir R. Jain | Neutrino spin-flavor oscillations in solar environment | Published in Res.Astron.Astrophys | RAA 2020 Vol. 20 No. 8, 123(10pp) | 10.1088/1674-4527/20/8/123 | null | hep-ph astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenon of neutrino spin-flavor oscillations due to solar
magnetic fields. This allows us to examine how significantly the electron
neutrinos produced in the solar interior undergo a resonant spin-flavor
conversion. We construct analytical models for the solar magnetic field in all
the three regions of the Sun. Neutrino spin-flavor oscillations in these
magnetic fields are examined by studying the level crossing phenomenon and
comparing the two cases of zero and non-zero vacuum mixing respectively.
Results from the Borexino experiment are used to place an upper limit on the
magnetic field in the solar core. Related phenomena such as effects of matter
on neutrino spin transitions and differences between Dirac and Majorana
transitions in the solar magnetic fields are also discussed.
| [
{
"created": "Sat, 22 Jun 2019 17:47:17 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 2020 12:55:17 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Feb 2020 18:51:24 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Aug 2020 15:36:58 GMT",
"version": "v4"
}
] | 2020-09-02 | [
[
"Joshi",
"Sandeep",
""
],
[
"Jain",
"Sudhir R.",
""
]
] | We study the phenomenon of neutrino spin-flavor oscillations due to solar magnetic fields. This allows us to examine how significantly the electron neutrinos produced in the solar interior undergo a resonant spin-flavor conversion. We construct analytical models for the solar magnetic field in all the three regions of the Sun. Neutrino spin-flavor oscillations in these magnetic fields are examined by studying the level crossing phenomenon and comparing the two cases of zero and non-zero vacuum mixing respectively. Results from the Borexino experiment are used to place an upper limit on the magnetic field in the solar core. Related phenomena such as effects of matter on neutrino spin transitions and differences between Dirac and Majorana transitions in the solar magnetic fields are also discussed. |
hep-ph/0210191 | Isabela Porto Cavalcante | Isabela P. Cavalcante, J. Sa Borges | Unitarized pion-nucleon scattering amplitude from inverse amplitude
method | 6 pages, 3 figures | Nucl.Phys. A720 (2003) 87-94 | 10.1016/S0375-9474(03)00669-9 | null | hep-ph | null | In a recent work on low energy pion-nucleon scattering, instead of using
chiral perturbation theory (ChPT) amplitude, we started from a pion-nucleon
{\it soft-pion} result and used elastic unitarity directly as a dynamical
constraint to construct first-order unitarity corrected amplitudes. The
resulting amplitudes are crossing symmetric but, as the ChPT ones, satisfy only
approximate unitarity relation. In the present work, we reconsider our approach
and we apply the inverse amplitude method (IAM) in order to access the energy
resonance region. We present the resulting S- and P-wave phase shifts that are
shown to be in qualitative agreement with experimental data.
| [
{
"created": "Sat, 12 Oct 2002 16:27:58 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2003 19:07:51 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Cavalcante",
"Isabela P.",
""
],
[
"Borges",
"J. Sa",
""
]
] | In a recent work on low energy pion-nucleon scattering, instead of using chiral perturbation theory (ChPT) amplitude, we started from a pion-nucleon {\it soft-pion} result and used elastic unitarity directly as a dynamical constraint to construct first-order unitarity corrected amplitudes. The resulting amplitudes are crossing symmetric but, as the ChPT ones, satisfy only approximate unitarity relation. In the present work, we reconsider our approach and we apply the inverse amplitude method (IAM) in order to access the energy resonance region. We present the resulting S- and P-wave phase shifts that are shown to be in qualitative agreement with experimental data. |
hep-ph/0010149 | J.-Alexis Rodriguez L. | R. Diaz, R. Martinez and J.-Alexis Rodriguez | Lepton Flavor Violation in the Two Higgs Doublet Model type III | 7 pages RevTeX4, 4 figures postscript, new section added and some new
references | Phys.Rev.D63:095007,2001 | 10.1103/PhysRevD.63.095007 | null | hep-ph | null | We consider the Two Higgs Doublet Model (2HDM) of type III which leads to
Flavour Changing Neutral Currents (FCNC) at tree level in the leptonic sector.
In the framework of this model we can have, in principle, two situations: the
case (a) when both doublets acquire a vacuum expectation value different from
zero and the case (b) when only one of them is not zero. In addition, we show
that we can make two types of rotations for the flavor mixing matrices which
generates four types of lagrangians, with the rotation of type I we recover the
case (b) from the case (a) in the limit $\tan \beta \to \infty $, and with the
rotation of type II we obtain the case (b) from (a) in the limit $\tan \beta
\to 0. $Moreover, two of the four possible lagrangians correspond to the models
of types I and II plus Flavor Changing (FC) interactions. The analitical
expressions of the partial lepton number violating widths $\Gamma (\mu \to eee)
$ and $\Gamma (\mu \to e\gamma) $are derived for the cases (a) and (b) and both
types of rotations.$ $In all cases these widths go asymptotically to zero in
the decoupling limit for all Higgses. We present from our analysis upper bounds
for the flavour changing transition $\mu \to e,$ and we show that such bounds
are sensitive to the VEV structure and the type of rotation utilized.
| [
{
"created": "Sat, 14 Oct 2000 23:03:27 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2000 17:24:54 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Diaz",
"R.",
""
],
[
"Martinez",
"R.",
""
],
[
"Rodriguez",
"J. -Alexis",
""
]
] | We consider the Two Higgs Doublet Model (2HDM) of type III which leads to Flavour Changing Neutral Currents (FCNC) at tree level in the leptonic sector. In the framework of this model we can have, in principle, two situations: the case (a) when both doublets acquire a vacuum expectation value different from zero and the case (b) when only one of them is not zero. In addition, we show that we can make two types of rotations for the flavor mixing matrices which generates four types of lagrangians, with the rotation of type I we recover the case (b) from the case (a) in the limit $\tan \beta \to \infty $, and with the rotation of type II we obtain the case (b) from (a) in the limit $\tan \beta \to 0. $Moreover, two of the four possible lagrangians correspond to the models of types I and II plus Flavor Changing (FC) interactions. The analitical expressions of the partial lepton number violating widths $\Gamma (\mu \to eee) $ and $\Gamma (\mu \to e\gamma) $are derived for the cases (a) and (b) and both types of rotations.$ $In all cases these widths go asymptotically to zero in the decoupling limit for all Higgses. We present from our analysis upper bounds for the flavour changing transition $\mu \to e,$ and we show that such bounds are sensitive to the VEV structure and the type of rotation utilized. |
2111.14884 | Zahra Tabrizi | Varun Mathur, Ian M. Shoemaker and Zahra Tabrizi | Using DUNE to Shed Light on the Electromagnetic Properties of Neutrinos | 17 pages, 8 figures, 1 table | null | 10.1007/JHEP10(2022)041 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study future DUNE sensitivity to various electromagnetic couplings of
neutrinos, including magnetic moments, milli-charges, and charge radii. The
DUNE PRISM capabilities play a crucial role in constraining the electron
flavored couplings. We find that DUNE will be able to place the strongest
terrestrial constraint on the muon-neutrino magnetic moment by improving on
LSND's bounds by roughly a factor of two, although Borexino's solar constraint
will still be stronger. For the muon neutrino milli-charge DUNE can place the
leading experimental bound, with two orders of magnitude improvement compared
to the existing COHERENT constraint. Finally, DUNE may be able to test the SM
prediction for the muon neutrino charge radius, by placing a constraint two
times better than CHARM-II and CCFR experiments.
| [
{
"created": "Mon, 29 Nov 2021 19:00:38 GMT",
"version": "v1"
}
] | 2022-10-26 | [
[
"Mathur",
"Varun",
""
],
[
"Shoemaker",
"Ian M.",
""
],
[
"Tabrizi",
"Zahra",
""
]
] | We study future DUNE sensitivity to various electromagnetic couplings of neutrinos, including magnetic moments, milli-charges, and charge radii. The DUNE PRISM capabilities play a crucial role in constraining the electron flavored couplings. We find that DUNE will be able to place the strongest terrestrial constraint on the muon-neutrino magnetic moment by improving on LSND's bounds by roughly a factor of two, although Borexino's solar constraint will still be stronger. For the muon neutrino milli-charge DUNE can place the leading experimental bound, with two orders of magnitude improvement compared to the existing COHERENT constraint. Finally, DUNE may be able to test the SM prediction for the muon neutrino charge radius, by placing a constraint two times better than CHARM-II and CCFR experiments. |
hep-ph/0107267 | Matsuoka Takeo | Y. Abe, C. Hattori, M. Ito, M. Matsuda, M. Matsunaga and T. Matsuoka | Flavor Symmetry on Non-Commutative Compact Space and $SU(6) \times
SU(2)_R$ Model | 28pages, Latex, no figures, Revised version includes some details | Prog.Theor.Phys. 106 (2001) 1275-1295 | 10.1143/PTP.106.1275 | AUE-01-01/KGKU-01-01/MIE01-01 | hep-ph | null | In the four-dimensional effective theory from string compactification
discrete flavor symmetries arise from symmetric structure of the compactified
space and generally contain both the $R$ symmetry and non-$R$ symmetry. We
point out that a new type of non-Abelian flavor symmetry can also appear if the
compact space is non- commutative. Introducing the dihedral group $D_4$ as such
a new type of flavor symmetry together with the $R$ symmetry and non-$R$
symmetry in $SU(6) \times SU(2)_R$ model, we explain not only fermion mass
hierarchies but also hierarchical energy scales including the breaking scale of
the GUT-type gauge symmetry, intermediate Majorana masses of R-handed neutrinos
and the scale of $\mu$-term.
| [
{
"created": "Thu, 26 Jul 2001 01:47:23 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2001 06:05:30 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Abe",
"Y.",
""
],
[
"Hattori",
"C.",
""
],
[
"Ito",
"M.",
""
],
[
"Matsuda",
"M.",
""
],
[
"Matsunaga",
"M.",
""
],
[
"Matsuoka",
"T.",
""
]
] | In the four-dimensional effective theory from string compactification discrete flavor symmetries arise from symmetric structure of the compactified space and generally contain both the $R$ symmetry and non-$R$ symmetry. We point out that a new type of non-Abelian flavor symmetry can also appear if the compact space is non- commutative. Introducing the dihedral group $D_4$ as such a new type of flavor symmetry together with the $R$ symmetry and non-$R$ symmetry in $SU(6) \times SU(2)_R$ model, we explain not only fermion mass hierarchies but also hierarchical energy scales including the breaking scale of the GUT-type gauge symmetry, intermediate Majorana masses of R-handed neutrinos and the scale of $\mu$-term. |
2312.05619 | Ai-Jun Ma | Ai-Jun Ma, Wen-Fei Wang | Contributions of the subprocess $K^*_0(1430) \to K\eta^{\prime}$ in the
charmless three-body $B$ meson decays | 10 pages, 2 figures and 4 tables. Matching the published version in
PRD | Phys. Rev. D 109, 056017 (2024) | 10.1103/PhysRevD.109.056017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the contributions for $K\eta^{\prime}$ pair originating from the
scalar intermediate state $K_0^{*}(1430)$ in the three-body decays $B\to
K\eta^{\prime} h$ ($h=\pi, K$) within the perturbative QCD approach. The
contribution of $K^*_0(1430)\to K\eta^{\prime}$ is described by the Flatt${\rm
\acute{e}}$ formula with coupled channels $K\pi$, $K\eta$ and $K\eta^{\prime}$.
The strong coupling constants $g_{K^*_0K\eta^{(\prime)}}$ are extracted from
$g_{K^*_0 K\pi}$ within flavor SU$(3)$ symmetry. In spite of the strong
depression by phase space near the threshold of $K\eta^\prime$, the $CP$
averaged branching fractions for the $B\to K^*_0(1430) h \to K\eta^\prime h$
decays are predicted to be on the order of $10^{-8}$ to $10^{-5}$, which are
non-negligible for the corresponding three-body $B$ decays. Since the K$\eta$
system is almost decoupled from the even-spin strange mesons under flavor
SU$(3)$ symmetry, those quasi-two-body $B$ decays with subprocess $K^*_0(1430)
\to K \eta$ shall have quite small branching ratios and are not taken into
account in this work. We also estimate that the branching fraction for
$K_0^{*}(1430)\to K\eta^{\prime}$ is about one fifth of that for
$K_0^{*}(1430)\to K\pi$. The predictions for the relevant decays are expected
to be tested by the LHCb and Belle-II experiments in the future.
| [
{
"created": "Sat, 9 Dec 2023 17:24:00 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2024 09:21:58 GMT",
"version": "v2"
}
] | 2024-03-21 | [
[
"Ma",
"Ai-Jun",
""
],
[
"Wang",
"Wen-Fei",
""
]
] | We study the contributions for $K\eta^{\prime}$ pair originating from the scalar intermediate state $K_0^{*}(1430)$ in the three-body decays $B\to K\eta^{\prime} h$ ($h=\pi, K$) within the perturbative QCD approach. The contribution of $K^*_0(1430)\to K\eta^{\prime}$ is described by the Flatt${\rm \acute{e}}$ formula with coupled channels $K\pi$, $K\eta$ and $K\eta^{\prime}$. The strong coupling constants $g_{K^*_0K\eta^{(\prime)}}$ are extracted from $g_{K^*_0 K\pi}$ within flavor SU$(3)$ symmetry. In spite of the strong depression by phase space near the threshold of $K\eta^\prime$, the $CP$ averaged branching fractions for the $B\to K^*_0(1430) h \to K\eta^\prime h$ decays are predicted to be on the order of $10^{-8}$ to $10^{-5}$, which are non-negligible for the corresponding three-body $B$ decays. Since the K$\eta$ system is almost decoupled from the even-spin strange mesons under flavor SU$(3)$ symmetry, those quasi-two-body $B$ decays with subprocess $K^*_0(1430) \to K \eta$ shall have quite small branching ratios and are not taken into account in this work. We also estimate that the branching fraction for $K_0^{*}(1430)\to K\eta^{\prime}$ is about one fifth of that for $K_0^{*}(1430)\to K\pi$. The predictions for the relevant decays are expected to be tested by the LHCb and Belle-II experiments in the future. |
hep-ph/9812338 | Nikolaos Irges | Nikolaos Irges | Anomalous U(1), holomorphy, supersymmetry breaking and dilaton
stabilization | 14 pages, no figures; wording of the abstract is changed | Phys.Rev. D59 (1999) 115008 | 10.1103/PhysRevD.59.115008 | null | hep-ph | null | We argue that in certain models with family symmetries the implementation of
the alignment mechanism for the supression of the flavor changing neutral
currents requires mass matrices with holomorphic zeros in the down quark
sector. Holomorphic zeros typically open flat directions that potentially spoil
the uniqueness of the supersymmetric vacuum. We then present an anomalous U(1)
model without holomorphic zeros in the quark sector that can reproduce the
fermion mass hierarchies, provided that $\tan{\beta}$ is of order one. To avoid
undesired flavor changing neutral currents we propose a supersymmetry breaking
mechanism and a dilaton stabilization scenario that result in degenerate
squarks at $M\sim M_{GUT}$ and a calculable low energy spectrum. We present the
numerical predictions of this model for the Higgs mass for different values of
$M$ and $\tan{\beta}$.
| [
{
"created": "Fri, 11 Dec 1998 20:32:09 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 1999 16:16:58 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Apr 1999 14:35:04 GMT",
"version": "v3"
},
{
"created": "Sat, 17 Jul 2004 07:21:42 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Irges",
"Nikolaos",
""
]
] | We argue that in certain models with family symmetries the implementation of the alignment mechanism for the supression of the flavor changing neutral currents requires mass matrices with holomorphic zeros in the down quark sector. Holomorphic zeros typically open flat directions that potentially spoil the uniqueness of the supersymmetric vacuum. We then present an anomalous U(1) model without holomorphic zeros in the quark sector that can reproduce the fermion mass hierarchies, provided that $\tan{\beta}$ is of order one. To avoid undesired flavor changing neutral currents we propose a supersymmetry breaking mechanism and a dilaton stabilization scenario that result in degenerate squarks at $M\sim M_{GUT}$ and a calculable low energy spectrum. We present the numerical predictions of this model for the Higgs mass for different values of $M$ and $\tan{\beta}$. |
hep-ph/0110259 | Carl Albright | Carl H. Albright (Fermilab/Northern Illinois U.) | SO(10) SUSY GUT Model with a U(1) x Z_2 x Z_2 Flavor Symmetry | 3 pages including 2 figures submitted for proceedings of the Snowmass
Workshop on the Future of Particle Physics, 30 June - 21 July 2001 | eConfC010630:P203,2001 | null | FERMILAB-Conf-01/306-T | hep-ph | null | An SO(10) SUSY GUT model which leads to maximal atmospheric neutrino mixing
and the LMA solar neutrino solution, developed in collaboration with S.M. Barr,
is briefly described. Since the model is quantitatively predictive, it can be
used to assess the need for a neutrino factory, as shown in collaboration with
S. Geer.
| [
{
"created": "Thu, 18 Oct 2001 16:53:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Albright",
"Carl H.",
"",
"Fermilab/Northern Illinois U."
]
] | An SO(10) SUSY GUT model which leads to maximal atmospheric neutrino mixing and the LMA solar neutrino solution, developed in collaboration with S.M. Barr, is briefly described. Since the model is quantitatively predictive, it can be used to assess the need for a neutrino factory, as shown in collaboration with S. Geer. |
1101.5326 | Shinya Matsuzaki | Ki-Young Choi, Deog Ki Hong and Shinya Matsuzaki | Techni-dilaton as Dark Matter | 6 pages, 2 figures; version to appear in PLB | null | 10.1016/j.physletb.2011.11.013 | PNUTP-11-A01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new dark matter candidate, {\it light decoupled techni-dilaton},
which arises from the almost scale-invariant/conformal (walking) technicolor.
We investigate its characteristic nature and discuss several cosmological and
astrophysical constraints. It turns out that techni-dilatons are extremely
weakly interacting and produced dominantly by the non-thermal mechanism to be
the main component of dark matter with mass range between around 0.01 eV and
500 eV for typical walking technicolor scenarios.
| [
{
"created": "Thu, 27 Jan 2011 16:19:42 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Feb 2011 05:24:50 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Apr 2011 06:32:11 GMT",
"version": "v3"
},
{
"created": "Sat, 5 Nov 2011 05:59:16 GMT",
"version": "v4"
}
] | 2015-05-27 | [
[
"Choi",
"Ki-Young",
""
],
[
"Hong",
"Deog Ki",
""
],
[
"Matsuzaki",
"Shinya",
""
]
] | We propose a new dark matter candidate, {\it light decoupled techni-dilaton}, which arises from the almost scale-invariant/conformal (walking) technicolor. We investigate its characteristic nature and discuss several cosmological and astrophysical constraints. It turns out that techni-dilatons are extremely weakly interacting and produced dominantly by the non-thermal mechanism to be the main component of dark matter with mass range between around 0.01 eV and 500 eV for typical walking technicolor scenarios. |
hep-ph/0212365 | Mairi Sakellariadou | Mairi Sakellariadou (University of Athens) | The role of topologigal defects in cosmology | Invited lectures in the NATO ASI / COSLAB (ESF) School ``Patterns of
symmetry breaking'', September 2002 (Cracow). 28 pages | null | null | null | hep-ph astro-ph gr-qc | null | Topological defects are involved in a plethora of physical and astrophysical
phenomena. In these lectures, I will review the r\^ ole they could play in the
large-scale structure formation and the anisotropies of the cosmic microwave
background, as well as in various high energy phenomena, including baryon
number asymmetry, ultra-high energy cosmic rays, and gamma ray bursts. I will
then summarize the gravitational effects of cosmic strings. Finally, I will
briefly discuss the r\^ ole of topological defects in brane world cosmology.
| [
{
"created": "Wed, 25 Dec 2002 17:40:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sakellariadou",
"Mairi",
"",
"University of Athens"
]
] | Topological defects are involved in a plethora of physical and astrophysical phenomena. In these lectures, I will review the r\^ ole they could play in the large-scale structure formation and the anisotropies of the cosmic microwave background, as well as in various high energy phenomena, including baryon number asymmetry, ultra-high energy cosmic rays, and gamma ray bursts. I will then summarize the gravitational effects of cosmic strings. Finally, I will briefly discuss the r\^ ole of topological defects in brane world cosmology. |
hep-ph/0410298 | Jose Ramon Espinosa | J.A. Casas, J.R. Espinosa and I. Hidalgo | Implications for New Physics from Fine-Tuning Arguments: I. Application
to SUSY and Seesaw Cases | 24 pages, LaTeX, 5 ps figures | JHEP0411:057,2004 | 10.1088/1126-6708/2004/11/057 | IFT-UAM/CSIC-04-57 | hep-ph | null | We revisit the standard argument to estimate the scale of new physics (NP)
beyond the SM, based on the sensitivity of the Higgs mass to quadratic
divergences. Although this argument is arguably naive, the corresponding
estimate, Lambda_SM < 2-3 TeV, works reasonably well in most cases and should
be considered a conservative bound, as it ignores other contributions to the
Higgs mass which are potentially large. Besides, the possibility of an
accidental Veltman-like cancellation does not raise significantly Lambda_SM.
One can obtain more precise implications from fine-tuning arguments in specific
examples of NP. Here we consider SUSY and right-handed (seesaw) neutrinos. SUSY
is a typical example for which the previous general estimate is indeed
conservative: the MSSM is fine-tuned a few %, even for soft masses of a few
hundred GeV. In contrast, other SUSY scenarios, in particular those with
low-scale SUSY breaking, can easily saturate the general bound on Lambda_SM.
The seesaw mechanism requires large fine-tuning if M_R > 10^7 GeV, unless there
is additional NP (SUSY being a favourite option).
| [
{
"created": "Thu, 21 Oct 2004 17:10:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Casas",
"J. A.",
""
],
[
"Espinosa",
"J. R.",
""
],
[
"Hidalgo",
"I.",
""
]
] | We revisit the standard argument to estimate the scale of new physics (NP) beyond the SM, based on the sensitivity of the Higgs mass to quadratic divergences. Although this argument is arguably naive, the corresponding estimate, Lambda_SM < 2-3 TeV, works reasonably well in most cases and should be considered a conservative bound, as it ignores other contributions to the Higgs mass which are potentially large. Besides, the possibility of an accidental Veltman-like cancellation does not raise significantly Lambda_SM. One can obtain more precise implications from fine-tuning arguments in specific examples of NP. Here we consider SUSY and right-handed (seesaw) neutrinos. SUSY is a typical example for which the previous general estimate is indeed conservative: the MSSM is fine-tuned a few %, even for soft masses of a few hundred GeV. In contrast, other SUSY scenarios, in particular those with low-scale SUSY breaking, can easily saturate the general bound on Lambda_SM. The seesaw mechanism requires large fine-tuning if M_R > 10^7 GeV, unless there is additional NP (SUSY being a favourite option). |
1501.00012 | Ya-Juan Zheng | Xiao-Gang He, Guan-Nan Li, Ya-Juan Zheng | Probing Higgs Boson $CP$ Properties with $t\bar{t}H$ at the LHC and the
100 TeV $pp$ Collider | 7 pages, 4 figures. v2: typos corrected and references added | null | 10.1142/S0217751X15501560 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs boson $H$ has the largest coupling to the top quark $t$ among the
standard model (SM) fermions. This is one of the ideal places to investigate
new physics beyond SM. In this work, we study the potential of determining
Higgs boson $CP$ properties at the LHC and future 33 TeV and 100 TeV $pp$
colliders by analysing various operators formed from final states variables in
$t\bar{t}H$ production. The discrimination power from SM coupling is obtained
with Higgs boson reconstructed from $ H\to \gamma \gamma$ and $ H\to b
\bar{b}$. We find that $t\bar{t}b\bar{b}$ process can provide more than
3$\sigma$ discrimination power with 300 $fb^{-1}$ integrated luminosity in a
wide range of allowed Higgs to top couplings for the LHC, the 33 TeV and 100
TeV colliders. For $t\bar{t}\gamma\gamma$ the discrimination power will be
below 3$\sigma$ at the LHC, while for 33 TeV and 100 TeV colliders, more than
3$\sigma$ sensitivity can be reached.
| [
{
"created": "Tue, 30 Dec 2014 21:00:33 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jan 2015 04:27:38 GMT",
"version": "v2"
}
] | 2015-09-30 | [
[
"He",
"Xiao-Gang",
""
],
[
"Li",
"Guan-Nan",
""
],
[
"Zheng",
"Ya-Juan",
""
]
] | The Higgs boson $H$ has the largest coupling to the top quark $t$ among the standard model (SM) fermions. This is one of the ideal places to investigate new physics beyond SM. In this work, we study the potential of determining Higgs boson $CP$ properties at the LHC and future 33 TeV and 100 TeV $pp$ colliders by analysing various operators formed from final states variables in $t\bar{t}H$ production. The discrimination power from SM coupling is obtained with Higgs boson reconstructed from $ H\to \gamma \gamma$ and $ H\to b \bar{b}$. We find that $t\bar{t}b\bar{b}$ process can provide more than 3$\sigma$ discrimination power with 300 $fb^{-1}$ integrated luminosity in a wide range of allowed Higgs to top couplings for the LHC, the 33 TeV and 100 TeV colliders. For $t\bar{t}\gamma\gamma$ the discrimination power will be below 3$\sigma$ at the LHC, while for 33 TeV and 100 TeV colliders, more than 3$\sigma$ sensitivity can be reached. |
hep-ph/0605023 | Michal Czakon | R. Boughezal, M. Czakon, T. Schutzmeier | Charm and Bottom Quark Masses from Perturbative QCD | 5 pages, 2 figures, final version as published | Phys.Rev.D74:074006,2006 | 10.1103/PhysRevD.74.074006 | null | hep-ph | null | Using a new result for the first moment of the hadronic production cross
section at order ${\cal O}(\alpha_s^3)$, and new data on the $J/\psi$ and
$\psi'$ resonances for the charm quark, we determine the \msb masses of the
charm and bottom quarks to be $\bar{m}_c(\bar{m}_c) = 1.295 \pm 0.015$ GeV and
$\bar{m}_b(\bar{m}_b) = 4.205 \pm 0.058$ GeV. We assume that the continuum
contribution to the sum rules is adequately described by pQCD. While we observe
a large reduction of the perturbative error, the shifts induced by the
theoretical input are very small. The main change in the central value of $m_c$
is related to the experimental data. On the other hand, the value of $m_b$ is
not changed by our calculation to the assumed precision.
| [
{
"created": "Mon, 1 May 2006 19:16:45 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2006 13:52:14 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Oct 2006 21:03:39 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Boughezal",
"R.",
""
],
[
"Czakon",
"M.",
""
],
[
"Schutzmeier",
"T.",
""
]
] | Using a new result for the first moment of the hadronic production cross section at order ${\cal O}(\alpha_s^3)$, and new data on the $J/\psi$ and $\psi'$ resonances for the charm quark, we determine the \msb masses of the charm and bottom quarks to be $\bar{m}_c(\bar{m}_c) = 1.295 \pm 0.015$ GeV and $\bar{m}_b(\bar{m}_b) = 4.205 \pm 0.058$ GeV. We assume that the continuum contribution to the sum rules is adequately described by pQCD. While we observe a large reduction of the perturbative error, the shifts induced by the theoretical input are very small. The main change in the central value of $m_c$ is related to the experimental data. On the other hand, the value of $m_b$ is not changed by our calculation to the assumed precision. |
hep-ph/0106185 | Sandipan Mohanty | Bo Andersson, Sandipan Mohanty, Fredrik Soderberg | The Lund Fragmentation Process for a Multi-gluon String According to the
Area Law | 1 title page + 36 pages, 20 figures | Eur.Phys.J.C21:631-647,2001 | 10.1007/s100520100757 | LU TP 01-22 | hep-ph | null | The Lund Area Law describes the probability for the production of a set of
colourless hadrons from an initial set of partons, in the Lund string
fragmentation model. In this paper we will present a general method to
implement the Area Law for a multi-gluon string state. The partonic states are
in general given by a perturbative QCD cascade and are consequently defined
only down to a cutoff in the energy momentum fluctuations. We will show that
our method defines the states down to the hadronic mass scale inside an
analytically calculable scenario.
We will then show that there is a differential version of our process which
is closely related to the generalised rapidity range \lambda, which has been
used as a measure on the partonic states. We identify \lambda as the area
spanned between the directrix curve (the curve given by the parton energy
momentum vectors laid out in colour order, which determines the string surface)
and the average curve (to be called the P-curve) of the stochastic X-curves
(curves obtained when the hadronic energy-momentum vectors are laid out in rank
order). Finally we show that from the X-curve corresponding to a particular
stochastic fragmentation situation it is possible to reproduce the directrix
curve (up to one starting vector and a set of sign choices, one for each
hadron).
| [
{
"created": "Sat, 16 Jun 2001 23:11:40 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Andersson",
"Bo",
""
],
[
"Mohanty",
"Sandipan",
""
],
[
"Soderberg",
"Fredrik",
""
]
] | The Lund Area Law describes the probability for the production of a set of colourless hadrons from an initial set of partons, in the Lund string fragmentation model. In this paper we will present a general method to implement the Area Law for a multi-gluon string state. The partonic states are in general given by a perturbative QCD cascade and are consequently defined only down to a cutoff in the energy momentum fluctuations. We will show that our method defines the states down to the hadronic mass scale inside an analytically calculable scenario. We will then show that there is a differential version of our process which is closely related to the generalised rapidity range \lambda, which has been used as a measure on the partonic states. We identify \lambda as the area spanned between the directrix curve (the curve given by the parton energy momentum vectors laid out in colour order, which determines the string surface) and the average curve (to be called the P-curve) of the stochastic X-curves (curves obtained when the hadronic energy-momentum vectors are laid out in rank order). Finally we show that from the X-curve corresponding to a particular stochastic fragmentation situation it is possible to reproduce the directrix curve (up to one starting vector and a set of sign choices, one for each hadron). |
2303.04022 | Xiang Liu | Si-Qiang Luo, Xiang Liu | The newly observed $\Omega_c(3327)$: A good candidate for a $D$-wave
charmed baryon | 6 pages, 4 tables, 3 figures. Accepted by PRD | Phys. Rev. D 107, 074041 (2023) | 10.1103/PhysRevD.107.074041 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The newly observed $\Omega_c(3327)$ gives us a good chance to construct the
$\Omega_c$ charmed baryon family. In this work, we carry out the mass spectrum
analysis by a non-relativistic potential model using Gaussian Expansion Method,
and the study of its two-body Okubo-Zweig-Iizuka allowed strong decay behavior.
Our results imply that the $\Omega_c(3327)$ is good candidate of $\Omega_c(1D)$
state with $J^P=5/2^+$. We also predict the spectroscopy behavior of other
$\Omega_c(1D)$ states, which may provide further clues to their search.
| [
{
"created": "Tue, 7 Mar 2023 16:38:14 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Apr 2023 11:53:55 GMT",
"version": "v2"
}
] | 2023-05-01 | [
[
"Luo",
"Si-Qiang",
""
],
[
"Liu",
"Xiang",
""
]
] | The newly observed $\Omega_c(3327)$ gives us a good chance to construct the $\Omega_c$ charmed baryon family. In this work, we carry out the mass spectrum analysis by a non-relativistic potential model using Gaussian Expansion Method, and the study of its two-body Okubo-Zweig-Iizuka allowed strong decay behavior. Our results imply that the $\Omega_c(3327)$ is good candidate of $\Omega_c(1D)$ state with $J^P=5/2^+$. We also predict the spectroscopy behavior of other $\Omega_c(1D)$ states, which may provide further clues to their search. |
hep-ph/0003097 | Peter Kroll | P. Kroll (Wuppertal Univ.) | The b-u skewed parton distributions | 8 pages, 3 figures (using epsfig.sty, espcrc1.sty) | Nucl.Phys. A680 (2000) 37-42 | 10.1016/S0375-9474(00)00384-5 | WU-B 00-05 | hep-ph | null | The b - u skewed parton distributions (SPDs) are discussed. The SPDs allow an
unambigous superposition of overlap and resonsance contributions and their
zeroth order moments represent the B - pi transition form factors. The values
of the form factors at maximum recoil are found to be F+(0)=F0(0)=0.22 with an
error of 0.05 in agreement with measurements of the B - pi pi branching ratio.
The branching ratios for the semi-leptonic B - pi decays are evaluated too.
| [
{
"created": "Fri, 10 Mar 2000 13:43:45 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kroll",
"P.",
"",
"Wuppertal Univ."
]
] | The b - u skewed parton distributions (SPDs) are discussed. The SPDs allow an unambigous superposition of overlap and resonsance contributions and their zeroth order moments represent the B - pi transition form factors. The values of the form factors at maximum recoil are found to be F+(0)=F0(0)=0.22 with an error of 0.05 in agreement with measurements of the B - pi pi branching ratio. The branching ratios for the semi-leptonic B - pi decays are evaluated too. |
0909.2937 | Seong Chan Park | Seong Chan Park, Kai Wang and Tsutomu T. Yanagida (Tokyo U., IPMU) | Neutrino mass from a hidden world and its phenomenological implications | 11 pages, 2 figures | Phys.Lett.B685:309-312,2010 | 10.1016/j.physletb.2010.01.070 | IPMU-09-0104 | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We propose a model of neutrino mass generation in extra dimension. Allowing a
large lepton number violation on a distant brane spatially separated from the
standard model brane, a small neutrino mass is naturally generated due to an
exponential suppression of the messenger field in the 5D bulk. The model
accommodates a large Yukawa coupling with the singlet neutrino (n_R) which may
change the standard Higgs search and can simultaneously accommodate visible
lepton number violation at the electroweak scale, which leads to very
interesting phenomenology at the CERN Large Hadron Collider.
| [
{
"created": "Wed, 16 Sep 2009 11:38:14 GMT",
"version": "v1"
}
] | 2010-03-02 | [
[
"Park",
"Seong Chan",
"",
"Tokyo U., IPMU"
],
[
"Wang",
"Kai",
"",
"Tokyo U., IPMU"
],
[
"Yanagida",
"Tsutomu T.",
"",
"Tokyo U., IPMU"
]
] | We propose a model of neutrino mass generation in extra dimension. Allowing a large lepton number violation on a distant brane spatially separated from the standard model brane, a small neutrino mass is naturally generated due to an exponential suppression of the messenger field in the 5D bulk. The model accommodates a large Yukawa coupling with the singlet neutrino (n_R) which may change the standard Higgs search and can simultaneously accommodate visible lepton number violation at the electroweak scale, which leads to very interesting phenomenology at the CERN Large Hadron Collider. |
0809.1301 | Stefano Actis | S. Actis, G. Passarino, C. Sturm, S. Uccirati | NLO Electroweak Corrections to Higgs Boson Production at Hadron
Colliders | LaTeX, 11 pages, 3 figures | Phys.Lett.B670:12-17,2008 | 10.1016/j.physletb.2008.10.018 | PITHA 08/20, SFB/CPP-08-62, TTP08-38 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results for the complete NLO electroweak corrections to Standard Model Higgs
production via gluon fusion are included in the total cross section for
hadronic collisions. Artificially large threshold effects are avoided working
in the complex-mass scheme. The numerical impact at LHC (Tevatron) energies is
explored for Higgs mass values up to 500 GeV (200 GeV). Assuming a complete
factorization of the electroweak corrections, one finds a +5 % shift with
respect to the NNLO QCD cross section for a Higgs mass of 120 GeV both at the
LHC and the Tevatron. Adopting two different factorization schemes for the
electroweak effects, an estimate of the corresponding total theoretical
uncertainty is computed.
| [
{
"created": "Mon, 8 Sep 2008 09:41:54 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Actis",
"S.",
""
],
[
"Passarino",
"G.",
""
],
[
"Sturm",
"C.",
""
],
[
"Uccirati",
"S.",
""
]
] | Results for the complete NLO electroweak corrections to Standard Model Higgs production via gluon fusion are included in the total cross section for hadronic collisions. Artificially large threshold effects are avoided working in the complex-mass scheme. The numerical impact at LHC (Tevatron) energies is explored for Higgs mass values up to 500 GeV (200 GeV). Assuming a complete factorization of the electroweak corrections, one finds a +5 % shift with respect to the NNLO QCD cross section for a Higgs mass of 120 GeV both at the LHC and the Tevatron. Adopting two different factorization schemes for the electroweak effects, an estimate of the corresponding total theoretical uncertainty is computed. |
1803.05466 | Patrick Foldenauer | Martin Bauer, Patrick Foldenauer, Joerg Jaeckel | Hunting All the Hidden Photons | 44 pages, 20 figures, 4 tables, v2: added limits from BaBar/KLOE
invisibles searches, added COHERENT limits from elastic neutrino-nucleus
scattering, updated references v3: minor corrections: updated Electron beam
dump limits (E137, E141, E774, Orsay) in Fig. 12, corrected discussion of
hadron beam bumps, improved discussion of beam dump calculation in appendix | J. High Energ. Phys. (2018) 2018: 94 | 10.1007/JHEP07(2018)094 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore constraints on gauge bosons of a weakly coupled $U(1)_{B-L}$,
$U(1)_{L_\mu-L_e}$, $U(1)_{L_e-L_\tau}$ and $U(1)_{L_\mu-L_\tau}$. To do so we
apply the full constraining power of experimental bounds derived for a hidden
photon of a secluded $U(1)_{X}$ and translate them to the considered gauge
groups. In contrast to the secluded hidden photon that acquires universal
couplings to charged Standard Model particles through kinetic mixing with the
photon, for these gauge groups the couplings to the different Standard Model
particles can vary widely. We take finite, computable loop-induced kinetic
mixing effects into account, which provide additional sensitivity in a range of
experiments. In addition, we collect and extend limits from neutrino
experiments as well as astrophysical and cosmological observations and include
new constraints from white dwarf cooling. We discuss the reach of future
experiments in searching for these gauge bosons.
| [
{
"created": "Wed, 14 Mar 2018 18:33:37 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2018 12:57:02 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Sep 2019 12:03:42 GMT",
"version": "v3"
}
] | 2019-09-27 | [
[
"Bauer",
"Martin",
""
],
[
"Foldenauer",
"Patrick",
""
],
[
"Jaeckel",
"Joerg",
""
]
] | We explore constraints on gauge bosons of a weakly coupled $U(1)_{B-L}$, $U(1)_{L_\mu-L_e}$, $U(1)_{L_e-L_\tau}$ and $U(1)_{L_\mu-L_\tau}$. To do so we apply the full constraining power of experimental bounds derived for a hidden photon of a secluded $U(1)_{X}$ and translate them to the considered gauge groups. In contrast to the secluded hidden photon that acquires universal couplings to charged Standard Model particles through kinetic mixing with the photon, for these gauge groups the couplings to the different Standard Model particles can vary widely. We take finite, computable loop-induced kinetic mixing effects into account, which provide additional sensitivity in a range of experiments. In addition, we collect and extend limits from neutrino experiments as well as astrophysical and cosmological observations and include new constraints from white dwarf cooling. We discuss the reach of future experiments in searching for these gauge bosons. |
1608.04239 | Dirk Rollmann | David E. Miller and Dirk Rollmann | Motion of Confined Particles | 6 pages, 3 figures | Acta Physica Polonica B Proceedings Supplement, Vol. 10 Number 3
(2017) 699-673 | 10.5506/APhysPolBSupp.10.669 | BI-TP 2016/07 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We carry out numerical evaluations of the motion of classical particles in
Minkowski Space $\mathbb{M}^{4}$ which are confined to the inside of a bag. In
particular, we analyze the structure of the paths evolving from the breaking of
the dilatation symmetry, the conformal symmetry and the combination of both
together. The confining forces arise directly from the corresponding
nonconserved currents. We demonstrate in our evaluations that these particles
under certain initial conditions move toward the interior of the bag.
| [
{
"created": "Mon, 15 Aug 2016 11:30:02 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Dec 2017 13:32:55 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"Miller",
"David E.",
""
],
[
"Rollmann",
"Dirk",
""
]
] | We carry out numerical evaluations of the motion of classical particles in Minkowski Space $\mathbb{M}^{4}$ which are confined to the inside of a bag. In particular, we analyze the structure of the paths evolving from the breaking of the dilatation symmetry, the conformal symmetry and the combination of both together. The confining forces arise directly from the corresponding nonconserved currents. We demonstrate in our evaluations that these particles under certain initial conditions move toward the interior of the bag. |
1303.6636 | Juan Rojo | Maxime Gouzevitch, Alexandra Oliveira, Juan Rojo, Rogerio Rosenfeld,
Gavin P. Salam, Veronica Sanz | Scale-invariant resonance tagging in multijet events and new physics in
Higgs pair production | 38 pages, 17 figures, accepted for publication in JHEP | null | 10.1007/JHEP07(2013)148 | CERN-PH-TH/2012-311, ICTP-SAIFR/2013-003 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study resonant pair production of heavy particles in fully hadronic final
states by means of jet substructure techniques. We propose a new resonance
tagging strategy that smoothly interpolates between the highly boosted and
fully resolved regimes, leading to uniform signal efficiencies and background
rejection rates across a broad range of masses. Our method makes it possible to
efficiently replace independent experimental searches, based on different final
state topologies, with a single common analysis. As a case study, we apply our
technique to pair production of Higgs bosons decaying into $b\bar{b}$ pairs in
generic New Physics scenarios. We adopt as benchmark models radion and massive
KK graviton production in warped extra dimensions. We find that despite the
overwhelming QCD background, the $4b$ final state has enough sensitivity to
provide a complementary handle in searches for enhanced Higgs pair production
at the LHC.
| [
{
"created": "Tue, 26 Mar 2013 20:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2013 07:09:49 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Gouzevitch",
"Maxime",
""
],
[
"Oliveira",
"Alexandra",
""
],
[
"Rojo",
"Juan",
""
],
[
"Rosenfeld",
"Rogerio",
""
],
[
"Salam",
"Gavin P.",
""
],
[
"Sanz",
"Veronica",
""
]
] | We study resonant pair production of heavy particles in fully hadronic final states by means of jet substructure techniques. We propose a new resonance tagging strategy that smoothly interpolates between the highly boosted and fully resolved regimes, leading to uniform signal efficiencies and background rejection rates across a broad range of masses. Our method makes it possible to efficiently replace independent experimental searches, based on different final state topologies, with a single common analysis. As a case study, we apply our technique to pair production of Higgs bosons decaying into $b\bar{b}$ pairs in generic New Physics scenarios. We adopt as benchmark models radion and massive KK graviton production in warped extra dimensions. We find that despite the overwhelming QCD background, the $4b$ final state has enough sensitivity to provide a complementary handle in searches for enhanced Higgs pair production at the LHC. |
hep-ph/9308366 | null | R. Casalbuoni, S. De Curtis and M. Grazzini | One Loop Calculation of the $\epsilon_3$ Parameter within the Extended
Bess Model | p. 9, LATEX, DFF 186/7/1993 | Phys.Lett. B317 (1993) 151-158 | 10.1016/0370-2693(93)91585-B | null | hep-ph | null | The existence of a strongly interacting sector responsible for the
electroweak symmetry breaking is assumed. As a consequence vector and
axial-vector bound states may be formed. These resonances mix with the Standard
Model gauge bosons and are of primary phenomenological importance for the LEP
physics. The extended BESS model is an effective scheme based on the symmetry
group $SU(8)_L\otimes SU(8)_R$, describing in a consistent way the interactions
among the pseudo-Goldstone bosons, vector and axial-vector resonances and the
standard gauge bosons. In a previous paper, the contribution from extended BESS
to the electroweak oblique corrections was evaluated. However, only an estimate
of the effects coming from mass and wave function renormalization of the new
resonances, was given. Here we complete the evaluation by computing explicitly
these effects. We confirm the previous result, that is, in spite of the great
precision of the present LEP measurements, the extended BESS parameter space is
not very much constrained.
| [
{
"created": "Tue, 31 Aug 1993 09:47:40 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Casalbuoni",
"R.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Grazzini",
"M.",
""
]
] | The existence of a strongly interacting sector responsible for the electroweak symmetry breaking is assumed. As a consequence vector and axial-vector bound states may be formed. These resonances mix with the Standard Model gauge bosons and are of primary phenomenological importance for the LEP physics. The extended BESS model is an effective scheme based on the symmetry group $SU(8)_L\otimes SU(8)_R$, describing in a consistent way the interactions among the pseudo-Goldstone bosons, vector and axial-vector resonances and the standard gauge bosons. In a previous paper, the contribution from extended BESS to the electroweak oblique corrections was evaluated. However, only an estimate of the effects coming from mass and wave function renormalization of the new resonances, was given. Here we complete the evaluation by computing explicitly these effects. We confirm the previous result, that is, in spite of the great precision of the present LEP measurements, the extended BESS parameter space is not very much constrained. |
1507.01256 | Andrey Lobanov | A. E. Lobanov | Particle quantum states with indefinite mass and neutrino oscillations | 22 pages, LaTeX. Final version | Annals of Physics 403, 82-105 (2019) | 10.1016/j.aop.2019.02.001 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we develop a mathematical formalism which allows obtaining
oscillation formula for neutrino of any energy. We demonstrate that in the
ultra-relativistic limit the results obtained in this new approach agree with
the previously used phenomenological theory which is only applicable to
ultra-relativistic neutrinos. To this end we do the following. The Hilbert
spaces of particle states are constructed in such a way that the neutrinos are
combined in a multiplet with its components being considered as different
quantum states of a single particle. The same is done for the charged leptons
and the down- and up-type quarks. In the theory based on the Lagrangian of the
fermion sector of the Standard Model modified in accordance with this
construction, the phenomenon of neutrino oscillations arises as a direct
consequence of the general principles of quantum field theory. Using the
example of the pion decay, when the resulting neutrino has to be
ultra-relativistic, it is shown that the neutrino states produced in the decay
process can be described by a superposition of states with different masses and
identical canonical momenta with very high accuracy.
| [
{
"created": "Sun, 5 Jul 2015 18:57:35 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Apr 2016 19:08:37 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Dec 2016 21:55:31 GMT",
"version": "v3"
},
{
"created": "Sat, 9 Dec 2017 15:25:21 GMT",
"version": "v4"
},
{
"creat... | 2019-06-28 | [
[
"Lobanov",
"A. E.",
""
]
] | In this work we develop a mathematical formalism which allows obtaining oscillation formula for neutrino of any energy. We demonstrate that in the ultra-relativistic limit the results obtained in this new approach agree with the previously used phenomenological theory which is only applicable to ultra-relativistic neutrinos. To this end we do the following. The Hilbert spaces of particle states are constructed in such a way that the neutrinos are combined in a multiplet with its components being considered as different quantum states of a single particle. The same is done for the charged leptons and the down- and up-type quarks. In the theory based on the Lagrangian of the fermion sector of the Standard Model modified in accordance with this construction, the phenomenon of neutrino oscillations arises as a direct consequence of the general principles of quantum field theory. Using the example of the pion decay, when the resulting neutrino has to be ultra-relativistic, it is shown that the neutrino states produced in the decay process can be described by a superposition of states with different masses and identical canonical momenta with very high accuracy. |
1312.2796 | Vladimir Sauli | Vladimir Sauli | Lattice data inspired but Minkowski space calculated QCD fundamental
propagator | Explanatory section redone, split an enlarged into two new Sections,
new simplify results added for LA, typos corrected the 26 pp, 6 figs | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Dyson-Schwinger equation for the quark propagator in Minkowski
space. In order to have analytical behaviour at the timelike axis of momenta
under control, we use the Stieltjes and the Hilbert transformation for the
interaction kernels and discuss the solution from the perspective of these
transformations. In addition, a lattice fit for the gluon propagator and
approximation for quark-gluon vertex are employed, and within the model the
quark propagator is obtained through the solution of Dyson-Schwinger equation
in Minkowski space. The resulting propagators in all studied cases do not show
up particle like pole and production thresholds. Instead of, the quark
propagator satisfies Hilbert transformation and the associated dynamical mass
function becomes complex without a presence of particle like branch point.
| [
{
"created": "Tue, 10 Dec 2013 13:46:32 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jan 2014 09:34:06 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Apr 2014 13:40:15 GMT",
"version": "v3"
}
] | 2014-04-02 | [
[
"Sauli",
"Vladimir",
""
]
] | We study the Dyson-Schwinger equation for the quark propagator in Minkowski space. In order to have analytical behaviour at the timelike axis of momenta under control, we use the Stieltjes and the Hilbert transformation for the interaction kernels and discuss the solution from the perspective of these transformations. In addition, a lattice fit for the gluon propagator and approximation for quark-gluon vertex are employed, and within the model the quark propagator is obtained through the solution of Dyson-Schwinger equation in Minkowski space. The resulting propagators in all studied cases do not show up particle like pole and production thresholds. Instead of, the quark propagator satisfies Hilbert transformation and the associated dynamical mass function becomes complex without a presence of particle like branch point. |
hep-ph/0101060 | Eugene Levin | S. Bondarenko, E. Gotsman, E. Levin and U. Maor (Tel Aviv U.) | An Inclusive Cross Section for the Nucleus - Nucleus Interaction at RHIC
Energies | 9 pages, 11 pictures in eps files | null | null | TAUP 2663-2001 | hep-ph | null | We discuss the saturation of the parton density in heavy ion collisions at
RHIC energiesusing a Pomeron approach. Our predictions for the particle density
in ion-ion collisions at RHIC energies can be utilized as the background for
the observation of possible quark-gluon plasma production.
| [
{
"created": "Mon, 8 Jan 2001 11:17:34 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2001 13:08:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bondarenko",
"S.",
"",
"Tel Aviv U."
],
[
"Gotsman",
"E.",
"",
"Tel Aviv U."
],
[
"Levin",
"E.",
"",
"Tel Aviv U."
],
[
"Maor",
"U.",
"",
"Tel Aviv U."
]
] | We discuss the saturation of the parton density in heavy ion collisions at RHIC energiesusing a Pomeron approach. Our predictions for the particle density in ion-ion collisions at RHIC energies can be utilized as the background for the observation of possible quark-gluon plasma production. |
2208.01319 | Yang Zhang | Peter Athron, Csaba Balazs, Andrew Fowlie, Lachlan Morris, Graham
White, Yang Zhang | How arbitrary are perturbative calculations of the electroweak phase
transition? | 45 pages, 16 figures and 2 tables; version accepted for publication
in JHEP; Correct the signs of mu in Table 2 | null | 10.1007/JHEP01(2023)050 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the extent to which perturbative calculations of the
electroweak phase transition are arbitrary and uncertain, owing to their gauge,
renormalisation scale and scheme dependence, as well as treatments of the
Goldstone catastrophe and daisy diagrams. Using the complete parameter space of
the Standard Model extended by a real scalar singlet with a $\mathbb{Z}_2$
symmetry as a test, we explore the properties of the electroweak phase
transition in general $R_\xi$ and covariant gauges, OS and
$\overline{\text{MS}}$ renormalisation schemes, and for common treatments of
the Goldstone catastrophe and daisy diagrams. Reassuringly, we find that
different renormalisation schemes and different treatments of the Goldstone
catastrophe and daisy diagrams typically lead to only modest changes in
predictions for the critical temperature and strength of the phase transition.
On the other hand, the gauge and renormalisation scale dependence may be
significant, and often impact the existence of the phase transition altogether.
| [
{
"created": "Tue, 2 Aug 2022 08:59:49 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 01:47:26 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Dec 2022 17:04:47 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Apr 2023 02:58:50 GMT",
"version": "v4"
}
] | 2023-04-20 | [
[
"Athron",
"Peter",
""
],
[
"Balazs",
"Csaba",
""
],
[
"Fowlie",
"Andrew",
""
],
[
"Morris",
"Lachlan",
""
],
[
"White",
"Graham",
""
],
[
"Zhang",
"Yang",
""
]
] | We investigate the extent to which perturbative calculations of the electroweak phase transition are arbitrary and uncertain, owing to their gauge, renormalisation scale and scheme dependence, as well as treatments of the Goldstone catastrophe and daisy diagrams. Using the complete parameter space of the Standard Model extended by a real scalar singlet with a $\mathbb{Z}_2$ symmetry as a test, we explore the properties of the electroweak phase transition in general $R_\xi$ and covariant gauges, OS and $\overline{\text{MS}}$ renormalisation schemes, and for common treatments of the Goldstone catastrophe and daisy diagrams. Reassuringly, we find that different renormalisation schemes and different treatments of the Goldstone catastrophe and daisy diagrams typically lead to only modest changes in predictions for the critical temperature and strength of the phase transition. On the other hand, the gauge and renormalisation scale dependence may be significant, and often impact the existence of the phase transition altogether. |
2002.01217 | Anton Motornenko | Anton Motornenko, Jan Steinheimer, Volodymyr Vovchenko, Stefan
Schramm, and Horst Stoecker | QCD equation of state at vanishing and high baryon density: Chiral Mean
Field model | 4 pages, 2 figures, Proceedings of the XXVIIIth International
Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter
2019), Wuhan, China, November 3-9 2019 | null | 10.1016/j.nuclphysa.2020.121836 | null | hep-ph astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamic properties of high temperature and high density QCD-matter
are studied using the Chiral SU(3)-flavor parity-doublet Polyakov-loop
quark-hadron mean-field model, CMF. The CMF model provides a proper description
of lattice QCD data, heavy-ions physics, and static neutron stars. The behavior
of lines of constant pressure with increase of baryon density is discussed. The
rapid change of pressure behavior at $\mu_B/T\approx3$ suggests a strong
contribution of baryons to thermodynamic properties at this region. The
position of this region is very close to the radius of convergence for a Taylor
expansion of the QCD pressure. The role of mesons and unstable hadrons in the
hydrodynamic expansion of strongly interacting matter is also discussed.
| [
{
"created": "Tue, 4 Feb 2020 10:46:05 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Motornenko",
"Anton",
""
],
[
"Steinheimer",
"Jan",
""
],
[
"Vovchenko",
"Volodymyr",
""
],
[
"Schramm",
"Stefan",
""
],
[
"Stoecker",
"Horst",
""
]
] | The thermodynamic properties of high temperature and high density QCD-matter are studied using the Chiral SU(3)-flavor parity-doublet Polyakov-loop quark-hadron mean-field model, CMF. The CMF model provides a proper description of lattice QCD data, heavy-ions physics, and static neutron stars. The behavior of lines of constant pressure with increase of baryon density is discussed. The rapid change of pressure behavior at $\mu_B/T\approx3$ suggests a strong contribution of baryons to thermodynamic properties at this region. The position of this region is very close to the radius of convergence for a Taylor expansion of the QCD pressure. The role of mesons and unstable hadrons in the hydrodynamic expansion of strongly interacting matter is also discussed. |
hep-ph/9610430 | Markus Diehl | M. Diehl | Azimuthal angles in diffractive ep collisions | 38 pages including 6 figures, LaTeX, uses epsf.sty. Text shortened,
physics unchanged. To appear in Z. Phys. C | Z.Phys.C76:499-514,1997 | 10.1007/s002880050573 | CPTH-S472-1096 and DAMTP-96-91 | hep-ph | null | We investigate azimuthal correlations in deep inelastic diffractive
scattering, e + p -> e + \tilde{p} + X. The dependence of the ep cross section
on the angle between the lepton plane and some direction in the hadronic final
state can be written in a simple form; its measurement can be used to constrain
the cross section for longitudinally polarised photons. Using the model of
nonperturbative two-gluon exchange of Landshoff and Nachtmann we calculate the
distribution of the azimuthal jet angle in diffractive dijet production and
find that useful bounds on the longitudinal cross section for such events might
be obtained from its measurement. We then discuss the predictions of this model
for the dependence of the ep cross section on the azimuthal angle of the proton
remnant \tilde{p}, which contains information about the helicity content of the
pomeron.
| [
{
"created": "Mon, 21 Oct 1996 17:19:26 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Sep 1997 09:14:23 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Diehl",
"M.",
""
]
] | We investigate azimuthal correlations in deep inelastic diffractive scattering, e + p -> e + \tilde{p} + X. The dependence of the ep cross section on the angle between the lepton plane and some direction in the hadronic final state can be written in a simple form; its measurement can be used to constrain the cross section for longitudinally polarised photons. Using the model of nonperturbative two-gluon exchange of Landshoff and Nachtmann we calculate the distribution of the azimuthal jet angle in diffractive dijet production and find that useful bounds on the longitudinal cross section for such events might be obtained from its measurement. We then discuss the predictions of this model for the dependence of the ep cross section on the azimuthal angle of the proton remnant \tilde{p}, which contains information about the helicity content of the pomeron. |
1911.06477 | Marco Merchand | Marco Merchand, Marc Sher | Constraints on the Parameter Space in an Inert Doublet Model with two
Active Doublets | Matches version to appear in JHEP. Significant modifications were
made including a discussion of lifting the dark democracy assumption of the
quartic couplings | null | 10.1007/JHEP03(2020)108 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a three Higgs doublet model where one doublet is inert and the other
two doublets are active. Flavor changing neutral currents are avoided at
tree-level by imposing a softly broken $Z'_2$ symmetry and we consider type I
and type II Yukawa structures. The lightest inert scalar is a viable Dark
Matter (DM) candidate. A numerical scan of the free parameters is performed
taking into account theoretical constraints such as positivity of the scalar
potential and unitarity of $2 \rightarrow 2$ scattering amplitudes. The model
is further constrained by experimental results such as $B$ physics lower limits
on charged Higgs masses, Electroweak Precision Observables, LEP II, LHC Higgs
measurements, Planck measurement of the DM relic abundance and WIMP direct
searches by the LUX and XENON1T experiments. The model predictions for
mono-jet, mono Z and mono Higgs final states are studied and tested against
current LHC data and we find the model to be allowed. We also discuss the
effects of abandoning the "dark democracy" assumption common in studies of
inert models. Projected sensitivities of direct detection experiments will
leave only a tiny window in the DM mass versus coupling plane that is compliant
with relic density bounds.
| [
{
"created": "Fri, 15 Nov 2019 04:52:36 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2020 15:26:53 GMT",
"version": "v2"
}
] | 2020-04-22 | [
[
"Merchand",
"Marco",
""
],
[
"Sher",
"Marc",
""
]
] | We study a three Higgs doublet model where one doublet is inert and the other two doublets are active. Flavor changing neutral currents are avoided at tree-level by imposing a softly broken $Z'_2$ symmetry and we consider type I and type II Yukawa structures. The lightest inert scalar is a viable Dark Matter (DM) candidate. A numerical scan of the free parameters is performed taking into account theoretical constraints such as positivity of the scalar potential and unitarity of $2 \rightarrow 2$ scattering amplitudes. The model is further constrained by experimental results such as $B$ physics lower limits on charged Higgs masses, Electroweak Precision Observables, LEP II, LHC Higgs measurements, Planck measurement of the DM relic abundance and WIMP direct searches by the LUX and XENON1T experiments. The model predictions for mono-jet, mono Z and mono Higgs final states are studied and tested against current LHC data and we find the model to be allowed. We also discuss the effects of abandoning the "dark democracy" assumption common in studies of inert models. Projected sensitivities of direct detection experiments will leave only a tiny window in the DM mass versus coupling plane that is compliant with relic density bounds. |
hep-ph/9906352 | Benaoum Hachemi | H.B. Benaoum (Mainz Uni.) | More on triangular mass matrices for fermions | 8 pages, latex; Submitted to Phys. Lett. B | null | null | MZ-TH/98-37 | hep-ph | null | A direct proof is given here which shows that instead of 6 complex numbers,
the triangular mass matrix for each sector could just be expressed in terms of
5 by performing a specific weak basis transformation, leading therefore to a
new textures for triangular mass matrices.
Furthermore, starting with the set of 20 real parameters for both sectors, it
can shown that 6 redundant parameters can be removed by using the rephasing
freedom.
| [
{
"created": "Sun, 13 Jun 1999 15:33:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Benaoum",
"H. B.",
"",
"Mainz Uni."
]
] | A direct proof is given here which shows that instead of 6 complex numbers, the triangular mass matrix for each sector could just be expressed in terms of 5 by performing a specific weak basis transformation, leading therefore to a new textures for triangular mass matrices. Furthermore, starting with the set of 20 real parameters for both sectors, it can shown that 6 redundant parameters can be removed by using the rephasing freedom. |
1207.3068 | Sanjin Beni\'c | S. Benic, D. Horvatic, D. Kekez, D. Klabucar | Restoration of singlet axial symmetry at finite temperature | null | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To accomodate recent RHIC data on eta prime multiplicity, we propose a
minimal modification of the Witten-Veneziano relation at high temperature. This
renders a significant drop of eta prime mass at high temperature signaling a
restoration of the U(1)A, and the Goldstone character of etaprime.
| [
{
"created": "Thu, 12 Jul 2012 19:24:17 GMT",
"version": "v1"
}
] | 2012-07-13 | [
[
"Benic",
"S.",
""
],
[
"Horvatic",
"D.",
""
],
[
"Kekez",
"D.",
""
],
[
"Klabucar",
"D.",
""
]
] | To accomodate recent RHIC data on eta prime multiplicity, we propose a minimal modification of the Witten-Veneziano relation at high temperature. This renders a significant drop of eta prime mass at high temperature signaling a restoration of the U(1)A, and the Goldstone character of etaprime. |
hep-ph/9606421 | null | Edmond L. Berger and Harry Contopanagos (Argonne National Laboratory) | Calculation of the Cross Section for Top Quark Production | 13 pages, LaTeX, including 6 ps files of figures. Invited paper
presented by E. L. Berger at the XIth Topical Workshop on Hadron Collider
Physics, Abano Terme, Padova, Italy, May, 1996 | null | null | ANL-HEP-CP-96-51 | hep-ph | null | We summarize calculations of the cross section for top quark production at
hadron colliders within the context of perturbative quantum chromodynamics,
including resummation of the effects of initial-state soft gluon radiation to
all orders in the strong coupling strength. In our approach we resum the
universal leading-logarithm contributions, and we restrict the calculation to
the region of phase space that is demonstrably perturbative. We compare our
approach with other methods. We present predictions of the physical cross
section as a function of the top quark mass in proton-antiproton reactions at
center-of-mass energies of 1.8 and 2.0 TeV, and we discuss estimated
uncertainties.
| [
{
"created": "Mon, 24 Jun 1996 23:21:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"Edmond L.",
"",
"Argonne National Laboratory"
],
[
"Contopanagos",
"Harry",
"",
"Argonne National Laboratory"
]
] | We summarize calculations of the cross section for top quark production at hadron colliders within the context of perturbative quantum chromodynamics, including resummation of the effects of initial-state soft gluon radiation to all orders in the strong coupling strength. In our approach we resum the universal leading-logarithm contributions, and we restrict the calculation to the region of phase space that is demonstrably perturbative. We compare our approach with other methods. We present predictions of the physical cross section as a function of the top quark mass in proton-antiproton reactions at center-of-mass energies of 1.8 and 2.0 TeV, and we discuss estimated uncertainties. |
1003.2570 | Joel Walker | Tianjun Li, Dimitri V. Nanopoulos, Joel W. Walker | Elements of F-ast Proton Decay | V2, As published in Nuclear Physics B; 57 pages, 7 figures, 12 tables | Nucl.Phys.B846:43-99,2011 | 10.1016/j.nuclphysb.2010.12.014 | ACT-03-10, MIFPA-10-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gauge coupling unification in the Minimal Supersymmetric Standard Model
(MSSM) strongly suggests the existence of a Grand Unified Theory (GUT), which
could be probed by the observation of proton decay. Proton lifetime in the p
\to (e+|mu+) pi0 dimension six mode is proportional in the fourth power to the
GUT mass scale, and inversely proportional in the fourth power to the GUT
coupling. We provide an updated dictionary of solutions for the relevant
unification parameters with generic beta-function coefficients, significantly
upgrading the level of detail with which second order effects are treated, and
correcting subtle published errors. F-lipped SU(5) with strict MSSM field
content is known to survive existing null detection limits for proton decay
approaching 10^34 years, and indeed, the lifetime predicted by prior studies
can be so long that successful detection is not currently plausible. Recently
studied classes of F-theory derived GUT models postulate additional vector-like
multiplets at the TeV scale which modify the renormalization group to yield a
substantial increase in the SU(3)_C X SU(2)_L unified coupling. We find the
conjunction of these models with the F-resh analysis employed to be
comparatively F-ast proton decay, only narrowly evading existing detection
limits, and likely falling within the observable range of proposed next
generation detectors such as DUSEL and Hyper-Kamiokande. The TeV-scale vector
multiplets are themselves suitable for cross correlation by the Large Hadron
Collider. Their presence moreover magnifies the gap between the dual mass
scales of Flipped SU(5), allowing for an elongated second stage
renormalization, pushing grand unification to the doorstep of the reduced
Planck mass.
| [
{
"created": "Fri, 12 Mar 2010 16:08:18 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2011 17:59:03 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Li",
"Tianjun",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
],
[
"Walker",
"Joel W.",
""
]
] | Gauge coupling unification in the Minimal Supersymmetric Standard Model (MSSM) strongly suggests the existence of a Grand Unified Theory (GUT), which could be probed by the observation of proton decay. Proton lifetime in the p \to (e+|mu+) pi0 dimension six mode is proportional in the fourth power to the GUT mass scale, and inversely proportional in the fourth power to the GUT coupling. We provide an updated dictionary of solutions for the relevant unification parameters with generic beta-function coefficients, significantly upgrading the level of detail with which second order effects are treated, and correcting subtle published errors. F-lipped SU(5) with strict MSSM field content is known to survive existing null detection limits for proton decay approaching 10^34 years, and indeed, the lifetime predicted by prior studies can be so long that successful detection is not currently plausible. Recently studied classes of F-theory derived GUT models postulate additional vector-like multiplets at the TeV scale which modify the renormalization group to yield a substantial increase in the SU(3)_C X SU(2)_L unified coupling. We find the conjunction of these models with the F-resh analysis employed to be comparatively F-ast proton decay, only narrowly evading existing detection limits, and likely falling within the observable range of proposed next generation detectors such as DUSEL and Hyper-Kamiokande. The TeV-scale vector multiplets are themselves suitable for cross correlation by the Large Hadron Collider. Their presence moreover magnifies the gap between the dual mass scales of Flipped SU(5), allowing for an elongated second stage renormalization, pushing grand unification to the doorstep of the reduced Planck mass. |
hep-ph/9505383 | null | Carl H. Albright and Satyanarayan Nandi | An Explicit SO(10) x U(1)_F Model of the Yukawa Interactions | 15 pages, latex with style files attached, 1 figure in uuencoded
postscript file | Mod.Phys.Lett. A11 (1996) 737-748 | 10.1142/S0217732396000746 | FERMILAB-PUB-95/107-T and OSU preprint 303 | hep-ph | null | We construct an explicit $SO(10) \times U(1)_F$ model of the Yukawa
interactions by using as a guide previous phenomenological results obtained
from a bottom-up approach to quark and lepton mass matrices. The global
$U(1)_F$ family symmetry group sets the textures for the Majorana and generic
Dirac mass matrices by restricting the type and number of Higgs diagrams which
can contribute to each matrix element, while the $SO(10)$ group relates each
particular element of the up, down, neutrino and charged lepton Dirac matrices.
The Yukawa couplings and vacuum expectation values associated with pairs of
{\bf 1,~45, 10,} and {\bf 126} Higgs representations successfully correlate all
the quark and lepton masses and mixings in the scenario incorporating the
nonadiabatic solar neutrino and atmospheric neutrino depletion effects.
| [
{
"created": "Thu, 25 May 1995 22:03:26 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 1995 17:00:51 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Albright",
"Carl H.",
""
],
[
"Nandi",
"Satyanarayan",
""
]
] | We construct an explicit $SO(10) \times U(1)_F$ model of the Yukawa interactions by using as a guide previous phenomenological results obtained from a bottom-up approach to quark and lepton mass matrices. The global $U(1)_F$ family symmetry group sets the textures for the Majorana and generic Dirac mass matrices by restricting the type and number of Higgs diagrams which can contribute to each matrix element, while the $SO(10)$ group relates each particular element of the up, down, neutrino and charged lepton Dirac matrices. The Yukawa couplings and vacuum expectation values associated with pairs of {\bf 1,~45, 10,} and {\bf 126} Higgs representations successfully correlate all the quark and lepton masses and mixings in the scenario incorporating the nonadiabatic solar neutrino and atmospheric neutrino depletion effects. |
1203.6679 | Vasile Topor Pop N | V. Topor Pop (McGill Univ., Montreal), M. Gyulassy (Columbia
University, NY), J. Barrette (McGill Univ, Montreal), C. Gale (McGill Univ.,
Montreal), and A. Warburton (McGill Univ, Montreal) | Hyperon/meson ratios in rare high-multiplicity $pp$ collisions at
energies available at the Large Hadron Collider, and potential signatures for
mini-quark-gluon plasma formation | version2, text modifications,new figures and references added; 22
pages, 8 figures. Accepted for publication, Phys. Rev. C | Phys.Rev.C 86 (2012) 044902 | 10.1103/PhysRevC.86.044902 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the framework of the HIJING/B\=B v2.0 model to simulate
high-multiplicity (HM) $p+p$ collision events at the Large Hadron Collider
(LHC) to study observables sensitive to possible collective phenomena, such as
strong longitudinal color fields (SLCF) modeled by an enhanced string tension
($\kappa$). We focus on the hyperon/meson yield ratios at center-of-mass (c.m.)
energy $\sqrt{s}$ = 7 TeV, in the transverse momentum region, $1 < p_T < 4 $
GeV/{\it c}. For minimum bias events these ratios are well described assuming
an energy dependence $\kappa = \kappa(s)= \kappa_{0} (s/s_{0})^{0.04} {\rm
GeV/fm}$ ($\kappa_{0}$= 1 GeV/fm), giving a value $\kappa = 2$ GeV/fm at
$\sqrt{s}$ = 7 TeV. We compare minimum bias (MB) events to simulated HM events
assuming that $\kappa(MB)=2$ GeV/fm could grow to an extreme value of
$\kappa(HM)=5$ GeV/fm that saturates the strangeness suppression factor. With
this assumption the model predicts a very strong enhancement of (multi)strange
baryon/meson ratios in HM events. If observed, such an enhancement could be
also interpreted as a possible signature for formation in HM $p+p$ collision
events of a deconfined but out of local thermal equilibrium {\em mini
quark-gluon plasma} (mQGP).
| [
{
"created": "Thu, 29 Mar 2012 21:59:23 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2012 10:47:17 GMT",
"version": "v2"
}
] | 2012-10-23 | [
[
"Pop",
"V. Topor",
"",
"McGill Univ., Montreal"
],
[
"Gyulassy",
"M.",
"",
"Columbia\n University, NY"
],
[
"Barrette",
"J.",
"",
"McGill Univ, Montreal"
],
[
"Gale",
"C.",
"",
"McGill Univ.,\n Montreal"
],
[
"Warburton",
"A... | We use the framework of the HIJING/B\=B v2.0 model to simulate high-multiplicity (HM) $p+p$ collision events at the Large Hadron Collider (LHC) to study observables sensitive to possible collective phenomena, such as strong longitudinal color fields (SLCF) modeled by an enhanced string tension ($\kappa$). We focus on the hyperon/meson yield ratios at center-of-mass (c.m.) energy $\sqrt{s}$ = 7 TeV, in the transverse momentum region, $1 < p_T < 4 $ GeV/{\it c}. For minimum bias events these ratios are well described assuming an energy dependence $\kappa = \kappa(s)= \kappa_{0} (s/s_{0})^{0.04} {\rm GeV/fm}$ ($\kappa_{0}$= 1 GeV/fm), giving a value $\kappa = 2$ GeV/fm at $\sqrt{s}$ = 7 TeV. We compare minimum bias (MB) events to simulated HM events assuming that $\kappa(MB)=2$ GeV/fm could grow to an extreme value of $\kappa(HM)=5$ GeV/fm that saturates the strangeness suppression factor. With this assumption the model predicts a very strong enhancement of (multi)strange baryon/meson ratios in HM events. If observed, such an enhancement could be also interpreted as a possible signature for formation in HM $p+p$ collision events of a deconfined but out of local thermal equilibrium {\em mini quark-gluon plasma} (mQGP). |
hep-ph/0002087 | Hendrik van Hees | Hendrik van Hees, J\"orn Knoll | Finite pion width effects on the rho-meson and di-lepton spectra | Invited talk given at International Workshop "Gross properties of
Nuclei and Nuclear Exitations", Hirschegg, Austria, 16-22.01.2000, Latex, 7
pages | null | null | null | hep-ph nucl-th | null | Within a field theoretical model where all damping width effects are treated
self-consistently we study the changes of the spectral properties of rho-mesons
due to the finite damping width of the pions in dense hadronic matter at finite
temperature. The corresponding effects in the di-lepton yields are presented.
Some problems concerning the self consistent treatment of vector or gauge
bosons are discussed.
| [
{
"created": "Tue, 8 Feb 2000 14:52:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"van Hees",
"Hendrik",
""
],
[
"Knoll",
"Jörn",
""
]
] | Within a field theoretical model where all damping width effects are treated self-consistently we study the changes of the spectral properties of rho-mesons due to the finite damping width of the pions in dense hadronic matter at finite temperature. The corresponding effects in the di-lepton yields are presented. Some problems concerning the self consistent treatment of vector or gauge bosons are discussed. |
0710.2394 | Stefan Scherer | Stefan Scherer (Johannes Gutenberg University, Mainz) | Recent Progress in Effective Field Theory in the One-Nucleon Sector | 6 pages, 2 figures, invited parallel session lead talk given at the
20th European Conference on Few-Body Problems in Physics (EFB20), Pisa,
Italy, 10-14 September 2007 | Few Body Syst.43:179-184,2008 | 10.1007/s00601-008-0229-3 | MKPH-T-07-14 | hep-ph | null | Chiral perturbation theory (ChPT) is the effective field theory of the strong
interactions at low energies. We will address the issue of a consistent power
counting scheme in a manifestly Lorentz-invariant formulation of baryon ChPT.
As applications we show how the inclusion of vector and axial-vector mesons in
the calculation of the nucleon electromagnetic and axial form factors,
respectively, lead to an improved description of the empirical data. Finally,
we will outline a systematic implementation of the Delta(1232) resonance into
the effective field theory program.
| [
{
"created": "Fri, 12 Oct 2007 06:56:58 GMT",
"version": "v1"
}
] | 2009-01-08 | [
[
"Scherer",
"Stefan",
"",
"Johannes Gutenberg University, Mainz"
]
] | Chiral perturbation theory (ChPT) is the effective field theory of the strong interactions at low energies. We will address the issue of a consistent power counting scheme in a manifestly Lorentz-invariant formulation of baryon ChPT. As applications we show how the inclusion of vector and axial-vector mesons in the calculation of the nucleon electromagnetic and axial form factors, respectively, lead to an improved description of the empirical data. Finally, we will outline a systematic implementation of the Delta(1232) resonance into the effective field theory program. |
hep-ph/0212271 | Antonio Vairo | Antonio Vairo (CERN) | Heavy Quarkonium Inclusive Decays: Theoretical Status and Perspectives | 10 pages, uses modified ws-procs9x6.cls (ws-procs9x6-notrim.cls),
Plenary talk presented at The 5th International Conference Quark Confinement
and the Hadron Spectrum, Gargnano, Italy 10-14 September, 2002 | null | 10.1142/9789812704269_0007 | CERN-TH/2002-376 | hep-ph | null | I review some recent progress and open problems in the calculation of
heavy-quarkonium inclusive decay widths into light particles in the framework
of QCD non-relativistic effective field theories.
| [
{
"created": "Wed, 18 Dec 2002 19:48:09 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Vairo",
"Antonio",
"",
"CERN"
]
] | I review some recent progress and open problems in the calculation of heavy-quarkonium inclusive decay widths into light particles in the framework of QCD non-relativistic effective field theories. |
1505.06981 | Yu-Jie Zhang Dr. | Guang-Zhi Xu, Gang Li, Yi-Jie Li, Kui-Yong Liu, and Yu-Jie Zhang | Interference effects on Higgs mass measurement in $e^+e^-\to
H(\gamma\gamma) Z$ at CEPC | Comments and suggestions are welcome | Chinese Physics C Vol. 40, No. 3 (2016) 033101 | 10.1088/1674-1137/40/3/033101 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A high luminosity Circular Electron Positron Collider (CEPC) as a Higgs
Factory will be helpful to the precision measurement of the Higgs mass. The
signal-background interference effect is carefully studied for the Higgs
diphoton decay mode in the associated Z boson production at the future $e^+e^-$
colliders at energy $246 {\rm GeV}$. The mass shifts go up from about $20 {\rm
MeV}$ to $50 {\rm MeV}$ for the experimental mass resolution ranging from $0.8
{\rm GeV}$ to $2 {\rm GeV}$.
| [
{
"created": "Sat, 23 May 2015 10:35:57 GMT",
"version": "v1"
}
] | 2016-01-08 | [
[
"Xu",
"Guang-Zhi",
""
],
[
"Li",
"Gang",
""
],
[
"Li",
"Yi-Jie",
""
],
[
"Liu",
"Kui-Yong",
""
],
[
"Zhang",
"Yu-Jie",
""
]
] | A high luminosity Circular Electron Positron Collider (CEPC) as a Higgs Factory will be helpful to the precision measurement of the Higgs mass. The signal-background interference effect is carefully studied for the Higgs diphoton decay mode in the associated Z boson production at the future $e^+e^-$ colliders at energy $246 {\rm GeV}$. The mass shifts go up from about $20 {\rm MeV}$ to $50 {\rm MeV}$ for the experimental mass resolution ranging from $0.8 {\rm GeV}$ to $2 {\rm GeV}$. |
1907.13477 | Narmin Huseynova | Narmin Huseynova, Shahin Mamedov | $a_1$ meson-baryon coupling constants in the framework of soft-wall and
hard-wall AdS/QCD models | 16 pages. arXiv admin note: text overlap with arXiv:1408.5496 version
published in IJMPA | null | 10.1142/S0217751X19502403 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the $a_1$ meson-nucleon coupling constant in the framework of
soft-wall and hard-wall AdS/QCD models. In the bulk of AdS space were written
bulk interaction Lagrangians for a minimal gauge coupling, a magnetic gauge
coupling and a triple coupling. To use AdS/CFT correspondence and these bulk
interaction Lagrangians we calculate the $a_1$ axial-vector meson-nucleon
coupling constant in the boundary of AdS space within both models. We observe
that the numerical values for the $g_{a_1 NN}$ coupling constant in the
framework of both models are more close to the experimental value than results
in other works. We also calculate the $g_{a_1 \Delta \Delta}$ axial-vector
meson-$\Delta$-baryon coupling constant in the framework of hard-wall AdS/QCD
model.
| [
{
"created": "Tue, 30 Jul 2019 09:38:38 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2020 10:43:12 GMT",
"version": "v2"
}
] | 2020-02-19 | [
[
"Huseynova",
"Narmin",
""
],
[
"Mamedov",
"Shahin",
""
]
] | We calculate the $a_1$ meson-nucleon coupling constant in the framework of soft-wall and hard-wall AdS/QCD models. In the bulk of AdS space were written bulk interaction Lagrangians for a minimal gauge coupling, a magnetic gauge coupling and a triple coupling. To use AdS/CFT correspondence and these bulk interaction Lagrangians we calculate the $a_1$ axial-vector meson-nucleon coupling constant in the boundary of AdS space within both models. We observe that the numerical values for the $g_{a_1 NN}$ coupling constant in the framework of both models are more close to the experimental value than results in other works. We also calculate the $g_{a_1 \Delta \Delta}$ axial-vector meson-$\Delta$-baryon coupling constant in the framework of hard-wall AdS/QCD model. |
hep-ph/9904272 | Ignatios Antoniadis | I. Antoniadis (Ecole Polytechnique) | On Possible Modifications of Gravitation in the (sub)millimeter range | 7 pages, LaTeX, needs moriond2.sty, one eps figure, references added
Invited talk given at the XXXIV Rencontres de Moriond on Gravitational Waves
and Experimental Gravity, Les Arcs, France, January 23-30, 1999 | null | null | CPHT-PC715.0499 | hep-ph gr-qc hep-th | null | I discuss possible modifications of gravitation at short distances in string
theories with large internal dimensions and low string scale. The modifications
are due to the change of Newton's law in the presence of (sub)millimeter-size
transverse dimensions, or due to the existence of light scalars with masses as
small as 10^{-3} eV, related to the mechanism of supersymmetry breaking,
mediating new Yukawa-type forces with strength comparable to gravity. These
modifications are testable in "tabletop" experiments that measure gravity at
such short distances.
| [
{
"created": "Thu, 8 Apr 1999 09:03:21 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 1999 21:35:06 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Antoniadis",
"I.",
"",
"Ecole Polytechnique"
]
] | I discuss possible modifications of gravitation at short distances in string theories with large internal dimensions and low string scale. The modifications are due to the change of Newton's law in the presence of (sub)millimeter-size transverse dimensions, or due to the existence of light scalars with masses as small as 10^{-3} eV, related to the mechanism of supersymmetry breaking, mediating new Yukawa-type forces with strength comparable to gravity. These modifications are testable in "tabletop" experiments that measure gravity at such short distances. |
hep-ph/0503248 | Brooks Thomas | Brooks Thomas | Requirements to Detect the Monoenergetic Photon Signature of Thermal
Cold Dark Matter in PeV-Scale Split Supersymmetry | 16 pages, 6 figures | Phys.Rev. D72 (2005) 023519 | 10.1103/PhysRevD.72.023519 | MCTP-05-66 | hep-ph | null | Split supersymmetry scenarios with PeV-scale scalar masses circumvent many of
the restrictions on supersymmetry coming from experimental limits on CP
violation, flavor-changing neutral currents, and the Higgs boson mass. We
consider the situation where the LSP is either a Wino or Higgsino and the
majority of its cold dark matter relic density is of thermal origin, in which
case its mass is specified to be 2.3 TeV for a Wino or 1.1 TeV for a Higgsino.
We examine the potential for indirect detection, at present and future
gamma-ray telescopes, of the monoenergetic photon lines that would result from
the annihilation of these particles near the galactic center. We show how the
possibility for detection depends on the precise form of the galactic
dark-matter halo profile and examine what performance attributes a gamma-ray
detector would need in order to register a 5-sigma discovery.
| [
{
"created": "Thu, 24 Mar 2005 04:54:06 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Thomas",
"Brooks",
""
]
] | Split supersymmetry scenarios with PeV-scale scalar masses circumvent many of the restrictions on supersymmetry coming from experimental limits on CP violation, flavor-changing neutral currents, and the Higgs boson mass. We consider the situation where the LSP is either a Wino or Higgsino and the majority of its cold dark matter relic density is of thermal origin, in which case its mass is specified to be 2.3 TeV for a Wino or 1.1 TeV for a Higgsino. We examine the potential for indirect detection, at present and future gamma-ray telescopes, of the monoenergetic photon lines that would result from the annihilation of these particles near the galactic center. We show how the possibility for detection depends on the precise form of the galactic dark-matter halo profile and examine what performance attributes a gamma-ray detector would need in order to register a 5-sigma discovery. |
1703.05255 | Fernando Febres Cordero | S. Abreu, F. Febres Cordero, H. Ita, M. Jaquier and B. Page | Subleading Poles in the Numerical Unitarity Method at Two Loops | 18 pages, 4 figures. v2: Minor text improvements; added reference;
matches published version | Phys. Rev. D 95, 096011 (2017) | 10.1103/PhysRevD.95.096011 | FR-PHENO-2017-002 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the unitarity approach for the numerical computation of two-loop
integral coefficients of scattering amplitudes. It is well known that the
leading propagator singularities of an amplitude's integrand are related to
products of tree amplitudes. At two loops, Feynman diagrams with doubled
propagators appear naturally, which lead to subleading pole contributions. In
general, it is not known how these contributions can be directly expressed in
terms of a product of on-shell tree amplitudes. We present a universal
algorithm to extract these subleading pole terms by releasing some of the
on-shell conditions. We demonstrate the new approach by numerically computing
two-loop four-gluon integral coefficients.
| [
{
"created": "Wed, 15 Mar 2017 16:56:17 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2017 07:17:53 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Abreu",
"S.",
""
],
[
"Cordero",
"F. Febres",
""
],
[
"Ita",
"H.",
""
],
[
"Jaquier",
"M.",
""
],
[
"Page",
"B.",
""
]
] | We describe the unitarity approach for the numerical computation of two-loop integral coefficients of scattering amplitudes. It is well known that the leading propagator singularities of an amplitude's integrand are related to products of tree amplitudes. At two loops, Feynman diagrams with doubled propagators appear naturally, which lead to subleading pole contributions. In general, it is not known how these contributions can be directly expressed in terms of a product of on-shell tree amplitudes. We present a universal algorithm to extract these subleading pole terms by releasing some of the on-shell conditions. We demonstrate the new approach by numerically computing two-loop four-gluon integral coefficients. |
2109.06618 | C. Pallis | C Pallis | SU(2,1) / (SU(2) x U(1)) B-L Higgs Inflation | Prepared for the Proceedings of HEP 2021, Thessaloniki, Greece | J.Phys.Conf.Ser. 2105 (2021) 12, 012007 | 10.1088/1742-6596/2105/1/012007 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a realization of Higgs inflation within Supergravity which is
largely tied to the existence of a pole of order two in the kinetic term of the
inflaton field. This pole arises due to the selected Kaehler potential which
parameterizes the SU(2,1) / (SU(2) x U(1)) manifold with scalar curvature
R_{21}=-6/N. The associated superpotential includes, in addition to the Higgs
superfields, a stabilizer superfield, respects a B-L gauge and an R symmetries
and contains the first allowed nonrenormalizable term. If the coefficient of
this term is almost equal to that of the others within about 10^-5 and N=2, the
inflationary observables can be done compatible with the present data. The
tuning can be eluded if we modify the Kaehler potential associated with the
manifold above. In this case, inflation can be realized with just
renormalizable superpotential terms and results to higher tensor-to-scalar
ratios as N approaches its maximum at N~80.
| [
{
"created": "Tue, 14 Sep 2021 12:14:46 GMT",
"version": "v1"
}
] | 2021-11-30 | [
[
"Pallis",
"C",
""
]
] | We present a realization of Higgs inflation within Supergravity which is largely tied to the existence of a pole of order two in the kinetic term of the inflaton field. This pole arises due to the selected Kaehler potential which parameterizes the SU(2,1) / (SU(2) x U(1)) manifold with scalar curvature R_{21}=-6/N. The associated superpotential includes, in addition to the Higgs superfields, a stabilizer superfield, respects a B-L gauge and an R symmetries and contains the first allowed nonrenormalizable term. If the coefficient of this term is almost equal to that of the others within about 10^-5 and N=2, the inflationary observables can be done compatible with the present data. The tuning can be eluded if we modify the Kaehler potential associated with the manifold above. In this case, inflation can be realized with just renormalizable superpotential terms and results to higher tensor-to-scalar ratios as N approaches its maximum at N~80. |
hep-ph/0012161 | null | I.I. Bigi | Heavy Flavour Physics: On Its More Than 50 Years Of History, Its Future
And The Rio Manifesto | 32 pages, LATEX, no figures; Summary Talk given at HQ2K `Heavy Quarks
at Fixed Target 2000', Rio de Janeiro, Brazil, Oct. 9 -12, 2000. A
clarification about the Beneke et al. approach has been added as has been a
reference on penguins on Rio's beaches | null | null | UND-HEP-00-BIG 11 | hep-ph | null | After a reminder about how $\Delta S\neq 0$ physics has been instrumental for
the development of the Standard Model I sketch theoretical technologies for
dealing with nonperturbative QCD in heavy flavour decays and state predictions
for CP odd effects as they were made in 1998. I review the exciting
developments in heavy flavour physics as presented at this conference. A
central message is presented in the `Rio Manifesto' where I recapitulate the
lessons we have learnt from charm physics, point out the special role future
dedicated charm studies can play in revealing the presence of New Physics and
give an introduction to the relevant phenomenology focussed on CP studies.
| [
{
"created": "Wed, 13 Dec 2000 21:27:33 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2000 05:22:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bigi",
"I. I.",
""
]
] | After a reminder about how $\Delta S\neq 0$ physics has been instrumental for the development of the Standard Model I sketch theoretical technologies for dealing with nonperturbative QCD in heavy flavour decays and state predictions for CP odd effects as they were made in 1998. I review the exciting developments in heavy flavour physics as presented at this conference. A central message is presented in the `Rio Manifesto' where I recapitulate the lessons we have learnt from charm physics, point out the special role future dedicated charm studies can play in revealing the presence of New Physics and give an introduction to the relevant phenomenology focussed on CP studies. |
2302.03383 | Shahin Mamedov | Minaya Allahverdiyeva and Shahin Mamedov | Vector Meson Gravitational Form Factors and Generalized Parton
Distributions at finite temperature within the soft-wall AdS/QCD Model | 19 pages, 9 figures, added references, numerical analysis extended,
match to published version | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the vector meson's gravitational form factors (GFFs) and
generalized parton distributions (GPDs) at finite temperatures within the
soft-wall AdS/ QCD model. The plotted soft-wall GFFs graphs at zero temperature
are close to the hard-wall results [1]. The dependence on temperature of the
GFFs and GPDs is studied using the thermal dilaton approach in the soft-wall
model. Plots of thermal GFFs show that they decrease in temperature increase.
Also, the gravitational radius of $\rho$ meson decreases in temperature growth
and becomes zero around the critical temperature $T_c=0.2 {\rm\ GeV}$. GPDs at
zero skewness are plotted and analyzed at zero and finite temperature cases.
| [
{
"created": "Tue, 7 Feb 2023 10:42:38 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 2023 11:14:06 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jul 2023 10:21:26 GMT",
"version": "v3"
}
] | 2023-07-04 | [
[
"Allahverdiyeva",
"Minaya",
""
],
[
"Mamedov",
"Shahin",
""
]
] | We investigate the vector meson's gravitational form factors (GFFs) and generalized parton distributions (GPDs) at finite temperatures within the soft-wall AdS/ QCD model. The plotted soft-wall GFFs graphs at zero temperature are close to the hard-wall results [1]. The dependence on temperature of the GFFs and GPDs is studied using the thermal dilaton approach in the soft-wall model. Plots of thermal GFFs show that they decrease in temperature increase. Also, the gravitational radius of $\rho$ meson decreases in temperature growth and becomes zero around the critical temperature $T_c=0.2 {\rm\ GeV}$. GPDs at zero skewness are plotted and analyzed at zero and finite temperature cases. |
1210.3297 | Steven D. Bass | Steven D. Bass | The cosmological constant puzzle: Vacuum energies from QCD to dark
energy | 10 pages, presented at the Symposium "Quantum Chromodynamics: History
and Prospects", Oberwoelz, Austria, September 3-8, 2012 | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accelerating expansion of the Universe points to a small positive vacuum
energy density and negative vacuum pressure. A strong candidate is the
cosmological constant in Einstein's equations of General Relativity. The vacuum
dark energy density extracted from astrophysics is 10^56 times smaller than the
value expected from the Higgs potential in Standard Model particle physics. The
dark energy scale is however close to the range of possible values expected for
the light neutrino mass. We investigate this physics in a simple toy model
where the chirality of the neutrino is treated by analogy as an Ising-like
"spin" degree of freedom.
| [
{
"created": "Thu, 11 Oct 2012 16:49:03 GMT",
"version": "v1"
}
] | 2012-10-12 | [
[
"Bass",
"Steven D.",
""
]
] | The accelerating expansion of the Universe points to a small positive vacuum energy density and negative vacuum pressure. A strong candidate is the cosmological constant in Einstein's equations of General Relativity. The vacuum dark energy density extracted from astrophysics is 10^56 times smaller than the value expected from the Higgs potential in Standard Model particle physics. The dark energy scale is however close to the range of possible values expected for the light neutrino mass. We investigate this physics in a simple toy model where the chirality of the neutrino is treated by analogy as an Ising-like "spin" degree of freedom. |
1307.2253 | Andrea De Simone | Giorgio Busoni, Andrea De Simone, Enrico Morgante, Antonio Riotto | On the Validity of the Effective Field Theory for Dark Matter Searches
at the LHC | 16 pages, 7 figures. References added and minor corrections made to
match published version | Physics Letters B 728C (2014) | 10.1016/j.physletb.2013.11.069 | CERN-PH-TH/2013-151, SISSA 29/2013/FISI | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the limitations to the use of the effective field theory approach
to study dark matter at the LHC. We introduce and study a few quantities, some
of them independent of the ultraviolet completion of the dark matter theory,
which quantify the error made when using effective operators to describe
processes with very high momentum transfer. Our criteria indicate up to what
cutoff energy scale, and with what precision, the effective description is
valid, depending on the dark matter mass and couplings.
| [
{
"created": "Mon, 8 Jul 2013 20:05:08 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2013 14:54:02 GMT",
"version": "v2"
}
] | 2013-12-20 | [
[
"Busoni",
"Giorgio",
""
],
[
"De Simone",
"Andrea",
""
],
[
"Morgante",
"Enrico",
""
],
[
"Riotto",
"Antonio",
""
]
] | We discuss the limitations to the use of the effective field theory approach to study dark matter at the LHC. We introduce and study a few quantities, some of them independent of the ultraviolet completion of the dark matter theory, which quantify the error made when using effective operators to describe processes with very high momentum transfer. Our criteria indicate up to what cutoff energy scale, and with what precision, the effective description is valid, depending on the dark matter mass and couplings. |
hep-ph/0008058 | Michael Dine | Alexey Anisimov and Michael Dine | Some Issues in Flat Direction Baryogenesis | Latex, 14 pages. Typos and some minor errors fixed | Nucl.Phys. B619 (2001) 729-740 | 10.1016/S0550-3213(01)00550-8 | SCIPP-00/26 | hep-ph | null | Motivated by recent developments, we explore some issues in Affleck-Dine
baryogenesis. We consider in greater detail the role of thermal effects in the
production of baryon number. We find that these effects are important even for
rather flat potentials, and obtain somewhat different estimates of the baryon
asymmetry than those in the literature. We also consider the decay of the
condensate, and possible implications of these observations for the formation
of Q-balls.
| [
{
"created": "Mon, 7 Aug 2000 16:55:43 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2001 22:12:45 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Anisimov",
"Alexey",
""
],
[
"Dine",
"Michael",
""
]
] | Motivated by recent developments, we explore some issues in Affleck-Dine baryogenesis. We consider in greater detail the role of thermal effects in the production of baryon number. We find that these effects are important even for rather flat potentials, and obtain somewhat different estimates of the baryon asymmetry than those in the literature. We also consider the decay of the condensate, and possible implications of these observations for the formation of Q-balls. |
2311.16920 | Dian-Yong Chen | Quan-Yun Guo, Zi-Li Yue, Dian-Yong Chen | $\Xi(1620)$ production in $K^- p$ scattering process | 5 pages, 5 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In the present work, the production of $\Xi(1620)$ in the $K^- p$ scattering
process is investigated by using an effective Lagrangian approach, where
$\Xi(1620)$ is considered as a $\bar{K} \Lambda$ molecular state. Our
estimations indicate that the cross sections for $K^-p\to K^+ \Xi(1620)^-$ are
$(1.48 ^{+ 1.12}_{-0.69}) \ \mathrm{\mu b}$ at $P_K=2.8 \ \mathrm{GeV}$, where
the uncertainties are resulted from the variation of the model parameter. As
for the $K^-p\to K^+ \pi^0 \Xi^-$ process, the cross sections are estimated to
be $(0.61 ^{+0.47}_{-0.29})\ \mathrm{\mu b}$ at $P_K =2.8 \ \mathrm{GeV}$,
which is consistent with the experimental measurements.
| [
{
"created": "Tue, 28 Nov 2023 16:24:57 GMT",
"version": "v1"
}
] | 2023-11-29 | [
[
"Guo",
"Quan-Yun",
""
],
[
"Yue",
"Zi-Li",
""
],
[
"Chen",
"Dian-Yong",
""
]
] | In the present work, the production of $\Xi(1620)$ in the $K^- p$ scattering process is investigated by using an effective Lagrangian approach, where $\Xi(1620)$ is considered as a $\bar{K} \Lambda$ molecular state. Our estimations indicate that the cross sections for $K^-p\to K^+ \Xi(1620)^-$ are $(1.48 ^{+ 1.12}_{-0.69}) \ \mathrm{\mu b}$ at $P_K=2.8 \ \mathrm{GeV}$, where the uncertainties are resulted from the variation of the model parameter. As for the $K^-p\to K^+ \pi^0 \Xi^-$ process, the cross sections are estimated to be $(0.61 ^{+0.47}_{-0.29})\ \mathrm{\mu b}$ at $P_K =2.8 \ \mathrm{GeV}$, which is consistent with the experimental measurements. |
1503.00530 | Malin Sjodahl | Yi-Jian Du, Malin Sjodahl and Johan Thoren | Recursion in multiplet bases for tree-level MHV gluon amplitudes | Version published in JHEP, reference updated | null | null | LU TP 15-07, MCnet-15-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the construction of tree-level MHV gluon amplitudes in
multiplet bases using BCFW recursion. The multiplet basis decomposition can
either be obtained by decomposing results derived in (for example) the DDM
basis or by formulating the recursion directly in the multiplet basis. We focus
on the latter approach and show how to efficiently deal with the color
structure appearing in the recursion. For illustration, we also explicitly
calculate the four-, five- and six-gluon amplitudes.
| [
{
"created": "Mon, 2 Mar 2015 14:03:57 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2015 12:18:02 GMT",
"version": "v2"
}
] | 2015-10-06 | [
[
"Du",
"Yi-Jian",
""
],
[
"Sjodahl",
"Malin",
""
],
[
"Thoren",
"Johan",
""
]
] | We investigate the construction of tree-level MHV gluon amplitudes in multiplet bases using BCFW recursion. The multiplet basis decomposition can either be obtained by decomposing results derived in (for example) the DDM basis or by formulating the recursion directly in the multiplet basis. We focus on the latter approach and show how to efficiently deal with the color structure appearing in the recursion. For illustration, we also explicitly calculate the four-, five- and six-gluon amplitudes. |
1805.01866 | Sumit Ghosh | Bhaskar Dutta, Sumit Ghosh, Ilia Gogoladze, Tianjun Li | Three-loop neutrino masses via new massive gauge bosons from $E_6$ GUT | 13 pages, 2 figure | Phys. Rev. D 98, 055028 (2018) | 10.1103/PhysRevD.98.055028 | MI-TH-1882 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an $SU(3)_C\times SU(2)_L \times SU(2)_N \times U(1)_Y$ model
arising from $E_6$ grand unified theory. We show that the tiny neutrino masses
in this model can be generated at the three-loop involving the $SU(2)_N$ gauge
bosons. With Yukawa couplings around 0.01 or larger and TeV-scale $SU(2)_N$
gauge bosons, we show that the neutrino oscillation data can be explained
naturally by presenting a concrete benchmark set of input parameters. All new
particles are around the TeV scale. Thus our model can be tested at the
ongoing/future collider experiments.
| [
{
"created": "Fri, 4 May 2018 17:21:06 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Oct 2018 02:13:11 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jun 2019 02:16:14 GMT",
"version": "v3"
}
] | 2019-06-13 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Ghosh",
"Sumit",
""
],
[
"Gogoladze",
"Ilia",
""
],
[
"Li",
"Tianjun",
""
]
] | We propose an $SU(3)_C\times SU(2)_L \times SU(2)_N \times U(1)_Y$ model arising from $E_6$ grand unified theory. We show that the tiny neutrino masses in this model can be generated at the three-loop involving the $SU(2)_N$ gauge bosons. With Yukawa couplings around 0.01 or larger and TeV-scale $SU(2)_N$ gauge bosons, we show that the neutrino oscillation data can be explained naturally by presenting a concrete benchmark set of input parameters. All new particles are around the TeV scale. Thus our model can be tested at the ongoing/future collider experiments. |
1210.7817 | Matthew McCullough | Francesco D'Eramo, Matthew McCullough, and Jesse Thaler | Multiple Gamma Lines from Semi-Annihilation | 15 pages of text, 8 figures. v2: refs added | null | 10.1088/1475-7516/2013/04/030 | MIT-CTP-4408; UCB-PTH-12/18 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hints in the Fermi data for a 130 GeV gamma line from the galactic center
have ignited interest in potential gamma line signatures of dark matter.
Explanations of this line based on dark matter annihilation face a parametric
tension since they often rely on large enhancements of loop-suppressed cross
sections. In this paper, we pursue an alternative possibility that dark matter
gamma lines could arise from "semi-annihilation" among multiple dark sector
states. The semi-annihilation reaction with a single final state photon is
typically enhanced relative to ordinary annihilation into photon pairs.
Semi-annihilation allows for a wide range of dark matter masses compared to the
fixed mass value required by annihilation, opening the possibility to explain
potential dark matter signatures at higher energies. The most striking
prediction of semi-annihilation is the presence of multiple gamma lines, with
as many as order N^3 lines possible for N dark sector states, allowing for dark
sector spectroscopy. A smoking gun signature arises in the simplest case of
degenerate dark matter, where a strong semi-annihilation line at 130 GeV would
be accompanied by a weaker annihilation line at 173 GeV. As a proof of
principle, we construct two explicit models of dark matter semi-annihilation,
one based on non-Abelian vector dark matter and the other based on retrofitting
Rayleigh dark matter.
| [
{
"created": "Mon, 29 Oct 2012 20:01:00 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2012 19:53:05 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"D'Eramo",
"Francesco",
""
],
[
"McCullough",
"Matthew",
""
],
[
"Thaler",
"Jesse",
""
]
] | Hints in the Fermi data for a 130 GeV gamma line from the galactic center have ignited interest in potential gamma line signatures of dark matter. Explanations of this line based on dark matter annihilation face a parametric tension since they often rely on large enhancements of loop-suppressed cross sections. In this paper, we pursue an alternative possibility that dark matter gamma lines could arise from "semi-annihilation" among multiple dark sector states. The semi-annihilation reaction with a single final state photon is typically enhanced relative to ordinary annihilation into photon pairs. Semi-annihilation allows for a wide range of dark matter masses compared to the fixed mass value required by annihilation, opening the possibility to explain potential dark matter signatures at higher energies. The most striking prediction of semi-annihilation is the presence of multiple gamma lines, with as many as order N^3 lines possible for N dark sector states, allowing for dark sector spectroscopy. A smoking gun signature arises in the simplest case of degenerate dark matter, where a strong semi-annihilation line at 130 GeV would be accompanied by a weaker annihilation line at 173 GeV. As a proof of principle, we construct two explicit models of dark matter semi-annihilation, one based on non-Abelian vector dark matter and the other based on retrofitting Rayleigh dark matter. |
2107.07251 | Jiri Hosek | Jiri Hosek | London model of dual color superconductor | null | null | 10.1051/epjconf/202227402001 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following closely the logic of the London phenomenological macroscopic theory
of the Meissner effect in superconductors we describe the origin of the
short-range behavior of the chromo-electric field, the necessary ingredient for
color confinement in QCD. The genuinely non-Abelian model is specified by the
strong-coupling colored-gluon current. Its first term, as the superconductivity
current, is proportional to the gauge potential. The new term is simply related
to the chromo-magnetic pseudo-vector current of the non-Abelian Bianchi
identity. We suggest that this London dual color superconductivity current is
responsible for the observed almost perfect fluidity in droplets of the
strongly interacting quark-gluon plasma. Its chromo-magnetic component should
have a specific experimental manifestation.
| [
{
"created": "Thu, 15 Jul 2021 11:21:38 GMT",
"version": "v1"
}
] | 2023-01-11 | [
[
"Hosek",
"Jiri",
""
]
] | Following closely the logic of the London phenomenological macroscopic theory of the Meissner effect in superconductors we describe the origin of the short-range behavior of the chromo-electric field, the necessary ingredient for color confinement in QCD. The genuinely non-Abelian model is specified by the strong-coupling colored-gluon current. Its first term, as the superconductivity current, is proportional to the gauge potential. The new term is simply related to the chromo-magnetic pseudo-vector current of the non-Abelian Bianchi identity. We suggest that this London dual color superconductivity current is responsible for the observed almost perfect fluidity in droplets of the strongly interacting quark-gluon plasma. Its chromo-magnetic component should have a specific experimental manifestation. |
1808.07492 | Julian Heeck | Julian Heeck, Daniele Teresi | Pati-Salam explanations of the B-meson anomalies | 26 pages, includes discussion of RGEs; to appear in JHEP | JHEP 12 (2018) 103 | 10.1007/JHEP12(2018)103 | ULB-TH/18-11, UCI-TR-2018-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a combined explanation of the increasingly tantalizing $B$-meson
anomalies, both in $R_{K^{(*)}}$ and $R_{D^{(*)}}$, in the Pati-Salam model
with minimal matter content. This well-known model, based on the gauge group
$SU(4)_{LC} \times SU(2)_L \times SU(2)_R$, naturally contains a variety of
scalar leptoquarks with related and restricted couplings. In particular we show
that the seesaw-motivated scalar leptoquark within the representation
$(\overline{10}, 3, 1)$ and its right-handed parity partner $(\overline{10}, 1,
3)$ can solve both anomalies while making testable predictions for related
observables such as $B \to K\nu\nu$ and $B \to K \mu\tau$. The solution of the
$R_{K^{(*)}}$ anomaly alone can be related to a type-II seesaw neutrino mass
structure. Explaining also $R_{D^{(*)}}$ requires the existence of a light
right-handed neutrino, which constrains the UV structure of the model.
| [
{
"created": "Wed, 22 Aug 2018 18:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2018 17:51:34 GMT",
"version": "v2"
}
] | 2018-12-18 | [
[
"Heeck",
"Julian",
""
],
[
"Teresi",
"Daniele",
""
]
] | We provide a combined explanation of the increasingly tantalizing $B$-meson anomalies, both in $R_{K^{(*)}}$ and $R_{D^{(*)}}$, in the Pati-Salam model with minimal matter content. This well-known model, based on the gauge group $SU(4)_{LC} \times SU(2)_L \times SU(2)_R$, naturally contains a variety of scalar leptoquarks with related and restricted couplings. In particular we show that the seesaw-motivated scalar leptoquark within the representation $(\overline{10}, 3, 1)$ and its right-handed parity partner $(\overline{10}, 1, 3)$ can solve both anomalies while making testable predictions for related observables such as $B \to K\nu\nu$ and $B \to K \mu\tau$. The solution of the $R_{K^{(*)}}$ anomaly alone can be related to a type-II seesaw neutrino mass structure. Explaining also $R_{D^{(*)}}$ requires the existence of a light right-handed neutrino, which constrains the UV structure of the model. |
hep-ph/9901453 | John McDonald | John McDonald | B-ball Baryogenesis and D-term Inflation | 14 pages LaTeX. Talk presented at SEWM'98, NORDITA, Copenhagen | null | null | null | hep-ph astro-ph | null | The MSSM has flat directions in its scalar potential, along which it is
natural for Bose condensates of squarks to form in the early Universe. A baryon
asymmetry can be induced in these condensates via Affleck-Dine baryogenesis.
The condensates are unstable with respect to fragmentation to "B-balls",
solitons made of squarks and carrying baryon number, which, if they survive
thermalization, fill the Universe down to low temperatures, much lower than
that of the electroweak phase transition, with interesting cosmological
consequences. In particular, their decay implies a similar number density of
baryons and dark matter neutralinos, in accordance with observations. Evasion
of thermalization and the ability to account for the observed baryon asymmetry
requires a very low reheating temperature, which, it is argued, is a natural
feature of presently favoured D-term inflation models.
| [
{
"created": "Fri, 29 Jan 1999 18:21:53 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 1999 11:55:23 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Feb 1999 17:30:40 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"McDonald",
"John",
""
]
] | The MSSM has flat directions in its scalar potential, along which it is natural for Bose condensates of squarks to form in the early Universe. A baryon asymmetry can be induced in these condensates via Affleck-Dine baryogenesis. The condensates are unstable with respect to fragmentation to "B-balls", solitons made of squarks and carrying baryon number, which, if they survive thermalization, fill the Universe down to low temperatures, much lower than that of the electroweak phase transition, with interesting cosmological consequences. In particular, their decay implies a similar number density of baryons and dark matter neutralinos, in accordance with observations. Evasion of thermalization and the ability to account for the observed baryon asymmetry requires a very low reheating temperature, which, it is argued, is a natural feature of presently favoured D-term inflation models. |
1810.10524 | Qin Qin | Shan Cheng and Qin Qin | $Z \to \pi^+\pi^-, K^+K^-$: A touchstone of the PQCD approach | matches published version | Phys. Rev. D 99, 016019 (2019) | 10.1103/PhysRevD.99.016019 | SI-HEP-2018-30, QFET-2018-19 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two rare decays, $Z \to \pi^+\pi^-$ and $K^+K^-$, in the
perturbative QCD approach up to the next-to-leading order of the strong
coupling and the leading power of $1/m_Z$, $m_Z$ being the $Z$ boson mass. The
branching ratios $\mathcal{B}(Z\to \pi^+\pi^-) = (0.83 \pm 0.02 \pm 0.02 \pm
0.04)\times 10^{-12}$ and $\mathcal{B}(Z\to K^+K^-) = (1.74^{+0.03}_{-0.05} \pm
0.04 \pm 0.02)\times 10^{-12}$ are obtained and can be measured at a tera-$Z$
factory. Because the subleading-power contributions to the branching ratios are
negligible, and the leading one does not depend on any free parameter, the two
channels can serve as a touchstone for the applicability of the perturbative
QCD approach.
| [
{
"created": "Wed, 24 Oct 2018 17:59:46 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2019 09:34:18 GMT",
"version": "v2"
}
] | 2019-02-06 | [
[
"Cheng",
"Shan",
""
],
[
"Qin",
"Qin",
""
]
] | We study two rare decays, $Z \to \pi^+\pi^-$ and $K^+K^-$, in the perturbative QCD approach up to the next-to-leading order of the strong coupling and the leading power of $1/m_Z$, $m_Z$ being the $Z$ boson mass. The branching ratios $\mathcal{B}(Z\to \pi^+\pi^-) = (0.83 \pm 0.02 \pm 0.02 \pm 0.04)\times 10^{-12}$ and $\mathcal{B}(Z\to K^+K^-) = (1.74^{+0.03}_{-0.05} \pm 0.04 \pm 0.02)\times 10^{-12}$ are obtained and can be measured at a tera-$Z$ factory. Because the subleading-power contributions to the branching ratios are negligible, and the leading one does not depend on any free parameter, the two channels can serve as a touchstone for the applicability of the perturbative QCD approach. |
1912.09862 | Patrick Blackstone | Patrick Blackstone, Matteo Fael, Emilie Passemar | $\tau \to \mu\mu\mu$ at a rate of one out of $10^{14}$ tau decays? | 6 pages, 2 figures, 1 table. v2 version published in EPJC, minor
changes | null | 10.1140/epjc/s10052-020-8059-7 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present in a full analytic form the partial widths for the lepton flavour
violating decays $\mu^\pm \to e^\pm e^+ e^-$ and $\tau^\pm \to \ell^\pm
\ell'^{+} \ell'^{-}$, with $\ell,\ell'=\mu,e$, mediated by neutrino
oscillations in the one-loop diagrams. Compared to the first result by Petcov
in [1], obtained in the zero momentum limit $\mathcal{P}\ll m_{\nu} \ll M_W$,
we retain full dependence on $\mathcal{P}$, the momenta and masses of external
particles, and we determine the branching ratios in the physical limit $m_\nu
\ll \mathcal{P} \ll M_W$. We show that the claim presented in [2] that the
$\tau \to \ell \ell' \ell'$ branching ratios could be as large as $10^{-14}$,
as a consequence of keeping the $\mathcal{P}$ dependence, is flawed. We find
rates of order $10^{-55}$, even smaller than those obtained in the zero
momentum limit, as the latter prediction contains an unphysical logarithmic
enhancement.
| [
{
"created": "Fri, 20 Dec 2019 15:04:39 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jun 2020 15:05:51 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Blackstone",
"Patrick",
""
],
[
"Fael",
"Matteo",
""
],
[
"Passemar",
"Emilie",
""
]
] | We present in a full analytic form the partial widths for the lepton flavour violating decays $\mu^\pm \to e^\pm e^+ e^-$ and $\tau^\pm \to \ell^\pm \ell'^{+} \ell'^{-}$, with $\ell,\ell'=\mu,e$, mediated by neutrino oscillations in the one-loop diagrams. Compared to the first result by Petcov in [1], obtained in the zero momentum limit $\mathcal{P}\ll m_{\nu} \ll M_W$, we retain full dependence on $\mathcal{P}$, the momenta and masses of external particles, and we determine the branching ratios in the physical limit $m_\nu \ll \mathcal{P} \ll M_W$. We show that the claim presented in [2] that the $\tau \to \ell \ell' \ell'$ branching ratios could be as large as $10^{-14}$, as a consequence of keeping the $\mathcal{P}$ dependence, is flawed. We find rates of order $10^{-55}$, even smaller than those obtained in the zero momentum limit, as the latter prediction contains an unphysical logarithmic enhancement. |
1710.01585 | Peter Cox | Peter Cox, Chengcheng Han, Tsutomu T. Yanagida | Right-handed Neutrino Dark Matter in a U(1) Extension of the Standard
Model | 10 two-column pages, 2 figures; v2: version published in JCAP | JCAP 01 (2018) 029 | 10.1088/1475-7516/2018/01/029 | IPMU17-0138 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider minimal $U(1)$ extensions of the Standard Model in which one of
the right-handed neutrinos is charged under the new gauge symmetry and plays
the role of dark matter. In particular, we perform a detailed phenomenological
study for the case of a $U(1)_{(B-L)_3}$ flavoured $B-L$ symmetry. If
perturbativity is required up to high-scales, we find an upper bound on the
dark matter mass of $m_\chi\lesssim2$ TeV, significantly stronger than that
obtained in simplified models. Furthermore, if the $U(1)_{(B-L)_3}$ breaking
scalar has significant mixing with the SM Higgs, there are already strong
constraints from direct detection. On the other hand, there remains significant
viable parameter space in the case of small mixing, which may be probed in the
future via LHC $Z^\prime$ searches and indirect detection. We also comment on
more general anomaly-free symmetries consistent with a TeV-scale RH neutrino
dark matter candidate, and show that if two heavy RH neutrinos for leptogenesis
are also required, one is naturally led to a single-parameter class of $U(1)$
symmetries.
| [
{
"created": "Wed, 4 Oct 2017 13:07:40 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2018 01:37:02 GMT",
"version": "v2"
}
] | 2018-01-19 | [
[
"Cox",
"Peter",
""
],
[
"Han",
"Chengcheng",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We consider minimal $U(1)$ extensions of the Standard Model in which one of the right-handed neutrinos is charged under the new gauge symmetry and plays the role of dark matter. In particular, we perform a detailed phenomenological study for the case of a $U(1)_{(B-L)_3}$ flavoured $B-L$ symmetry. If perturbativity is required up to high-scales, we find an upper bound on the dark matter mass of $m_\chi\lesssim2$ TeV, significantly stronger than that obtained in simplified models. Furthermore, if the $U(1)_{(B-L)_3}$ breaking scalar has significant mixing with the SM Higgs, there are already strong constraints from direct detection. On the other hand, there remains significant viable parameter space in the case of small mixing, which may be probed in the future via LHC $Z^\prime$ searches and indirect detection. We also comment on more general anomaly-free symmetries consistent with a TeV-scale RH neutrino dark matter candidate, and show that if two heavy RH neutrinos for leptogenesis are also required, one is naturally led to a single-parameter class of $U(1)$ symmetries. |
1106.3283 | Damir Becirevic | Damir Becirevic and Elia Schneider | On transverse asymmetries in B --> K* l+l- | 21 pages, 4 figures (png) - version published in NPB | null | 10.1016/j.nuclphysb.2011.09.004 | LPT 11-50 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the three independent asymmetries, AT(2)(q2), AT(im)(q2) and
AT(re)(q2), that one can build from the amplitudes A_perp(q2) and A_par(q2).
These quantities are expected to be accessible from the new B-physics
experiments, they are sensitive to the presence of new physics, and they are
not significantly sensitive to hadronic uncertainties. Studying their low
q2-dependence can be helpful in discerning among various possible new physics
scenarios. All three asymmetries can be extracted from the full angular
analysis of B-->K* l+l-. Our formulas apply to both the massless and the
massive lepton case.
| [
{
"created": "Thu, 16 Jun 2011 17:26:11 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2011 16:29:37 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Sep 2011 09:41:13 GMT",
"version": "v3"
},
{
"created": "Thu, 2 Feb 2012 14:11:48 GMT",
"version": "v4"
}
] | 2015-05-28 | [
[
"Becirevic",
"Damir",
""
],
[
"Schneider",
"Elia",
""
]
] | We discuss the three independent asymmetries, AT(2)(q2), AT(im)(q2) and AT(re)(q2), that one can build from the amplitudes A_perp(q2) and A_par(q2). These quantities are expected to be accessible from the new B-physics experiments, they are sensitive to the presence of new physics, and they are not significantly sensitive to hadronic uncertainties. Studying their low q2-dependence can be helpful in discerning among various possible new physics scenarios. All three asymmetries can be extracted from the full angular analysis of B-->K* l+l-. Our formulas apply to both the massless and the massive lepton case. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.