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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1506.04285 | Alexander Bylinkin | A. A. Bylinkin, N. S. Chernyavskaya, A. A. Rostovtsev | Two components in charged particle production in heavy-ion collisions | a version as to appear in NPB after editorial comments | null | 10.1016/j.nuclphysb.2015.12.009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse momentum spectra of charged particle production in heavy-ion
collisions are considered in terms of a recently introduced Two Component
parameterization combining exponential ("soft") and power-law ("hard")
functional forms. The charged hadron densities calculated separately for them
are plotted versus number of participating nucleons, $N_{part}$. The obtained
dependences are discussed and the possible link between the two component
parameterization introduced by the authors and the two component model
historically used for the case of heavy-ion collisions is established. Next,
the variations of the parameters of the introduced approach with the center of
mass energy and centrality are studied using the available data from RHIC and
LHC experiments. The spectra shapes are found to show universal dependences on
$N_{part}$ for all investigated collision energies.
| [
{
"created": "Sat, 13 Jun 2015 16:10:12 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Nov 2015 20:56:14 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Bylinkin",
"A. A.",
""
],
[
"Chernyavskaya",
"N. S.",
""
],
[
"Rostovtsev",
"A. A.",
""
]
] | Transverse momentum spectra of charged particle production in heavy-ion collisions are considered in terms of a recently introduced Two Component parameterization combining exponential ("soft") and power-law ("hard") functional forms. The charged hadron densities calculated separately for them are plotted versus number of participating nucleons, $N_{part}$. The obtained dependences are discussed and the possible link between the two component parameterization introduced by the authors and the two component model historically used for the case of heavy-ion collisions is established. Next, the variations of the parameters of the introduced approach with the center of mass energy and centrality are studied using the available data from RHIC and LHC experiments. The spectra shapes are found to show universal dependences on $N_{part}$ for all investigated collision energies. |
hep-ph/9903536 | Larry McLerran | Larry McLerran | Three Lectures on the Physics of Small x and High Gluon Density | 23 figures, Lectures presented at the VIII'th Mexican School of
Particles and Fields | AIP Conf.Proc.490:42-79,1999 | 10.1063/1.1301382 | null | hep-ph | null | In these lectures, I shall discuss small x physics and the consequences of
high gluon density which arises as x decreases. I argue that an understanding
of this problem would lead to knowledge of the high energy asymptotics of
hadronic processes. The high gluon density should allow a first principles
computation of these asymptotics from QCD.
| [
{
"created": "Tue, 30 Mar 1999 21:45:29 GMT",
"version": "v1"
}
] | 2010-12-13 | [
[
"McLerran",
"Larry",
""
]
] | In these lectures, I shall discuss small x physics and the consequences of high gluon density which arises as x decreases. I argue that an understanding of this problem would lead to knowledge of the high energy asymptotics of hadronic processes. The high gluon density should allow a first principles computation of these asymptotics from QCD. |
1409.8620 | Eduardo Rojas | E. Rojas, B. El-Bennich, J.P.B.C. De Melo, M.Ali Paracha | Insights into the quark-gluon vertex from lattice QCD and meson
spectroscopy | null | null | 10.1007/s00601-015-1020-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By comparing successful quark-gluon vertex interaction models with the
corresponding interaction extracted from lattice-QCD data on the quark's
propagator, we identify common qualitative features which could be important to
tune future interaction models beyond the rainbow ladder approximation.
Clearly, a quantitative comparison is conceptually not simple, but
qualitatively the results suggest that a realistic interaction should be
relatively broad with a strong support at about $0.4-0.6$~GeV and
infrared-finite.
| [
{
"created": "Tue, 30 Sep 2014 16:31:05 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2014 17:35:33 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Sep 2015 16:30:51 GMT",
"version": "v3"
}
] | 2015-09-30 | [
[
"Rojas",
"E.",
""
],
[
"El-Bennich",
"B.",
""
],
[
"De Melo",
"J. P. B. C.",
""
],
[
"Paracha",
"M. Ali",
""
]
] | By comparing successful quark-gluon vertex interaction models with the corresponding interaction extracted from lattice-QCD data on the quark's propagator, we identify common qualitative features which could be important to tune future interaction models beyond the rainbow ladder approximation. Clearly, a quantitative comparison is conceptually not simple, but qualitatively the results suggest that a realistic interaction should be relatively broad with a strong support at about $0.4-0.6$~GeV and infrared-finite. |
2203.01708 | Nicolo de Groot | Nicolo de Groot | Plutonium-241 as a possible isotope for neutrino mass measurement and
capture | 6 pages, 1 figure | null | 10.1088/1361-6471/acc5fc | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Tritium has been the isotope of choice for measurements of the neutrino mass
and planned detection of the relic neutrino background. The low mass of $^{3}$H
leads to large recoil energy of the nucleus. This has emerged as a limiting
factor for both measurements. We investigate $^{241}$Pu as an alternative. The
recoil is 80x smaller and it has similar decay energy and lifetime as $^{3}$H.
We evaluate for the first time its soft-neutrino capture cross-section and find
$(\sigma v)_{\nu} = 1.52 \times 10^{-45}$. This is 40% of the capture
cross-section for tritium and makes $^{241}$Pu an interesting alternative for
$^{3}$H.
| [
{
"created": "Thu, 3 Mar 2022 13:31:20 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2022 08:50:15 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Oct 2022 12:42:27 GMT",
"version": "v3"
}
] | 2023-04-26 | [
[
"de Groot",
"Nicolo",
""
]
] | Tritium has been the isotope of choice for measurements of the neutrino mass and planned detection of the relic neutrino background. The low mass of $^{3}$H leads to large recoil energy of the nucleus. This has emerged as a limiting factor for both measurements. We investigate $^{241}$Pu as an alternative. The recoil is 80x smaller and it has similar decay energy and lifetime as $^{3}$H. We evaluate for the first time its soft-neutrino capture cross-section and find $(\sigma v)_{\nu} = 1.52 \times 10^{-45}$. This is 40% of the capture cross-section for tritium and makes $^{241}$Pu an interesting alternative for $^{3}$H. |
1606.06238 | Pasquale Di Bari | Pasquale Di Bari, Patrick Otto Ludl and Sergio Palomares-Ruiz | Unifying leptogenesis, dark matter and high-energy neutrinos with
right-handed neutrino mixing via Higgs portal | 48 pages, 10 figures, version for publication in JCAP: v3: corrected
calculation of the abundance of the source right-handed neutrino for initial
vanishing abundance (Eq. (75)): the upper bound on the DM mass gets more
stringent but conclusion almost unchanged; see footnote on the cover page for
more details | null | 10.1088/1475-7516/2016/11/044 | IFIC/16-42 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit a model in which neutrino masses and mixing are described by a two
right-handed (RH) neutrino seesaw scenario, implying a strictly hierarchical
light neutrino spectrum. A third decoupled RH neutrino, $N_{\rm DM}$ with mass
$M_{\rm DM}$, plays the role of cold dark matter (DM) and is produced by the
mixing with a source RH neutrino, $N_{\rm S}$ with mass $M_{\rm S}$, induced by
Higgs portal interactions. The same interactions are also responsible for
$N_{\rm DM}$ decays. We discuss in detail the constraints coming from DM
abundance and stability conditions, showing that in the hierarchical case
($M_{\rm DM} \gg M_{\rm S}$) there is an allowed window on $M_{\rm DM}$, which
necessarily implies a contribution from DM decays to the high-energy neutrino
flux recently detected by IceCube. We also show how the model can explain the
matter-antimatter asymmetry of the Universe via leptogenesis in the
quasi-degenerate limit. In this case, the DM mass should be within the range
300 GeV $\lesssim M_{\rm S} < M_{\rm DM} \lesssim$ 10 PeV. We discuss the
specific properties of this high-energy neutrino flux and show the predicted
event spectrum for two exemplary cases. Although DM decays, with a relatively
hard spectrum, cannot account for all the IceCube high-energy data, we
illustrate how this extra source of high-energy neutrinos could reasonably
explain some potential features in the observed spectrum. In this way, this
represents a unified scenario for leptogenesis and DM that could be tested
during the next years with more high-energy neutrino events.
| [
{
"created": "Mon, 20 Jun 2016 18:34:25 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2016 15:47:14 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Nov 2018 16:18:05 GMT",
"version": "v3"
}
] | 2018-11-20 | [
[
"Di Bari",
"Pasquale",
""
],
[
"Ludl",
"Patrick Otto",
""
],
[
"Palomares-Ruiz",
"Sergio",
""
]
] | We revisit a model in which neutrino masses and mixing are described by a two right-handed (RH) neutrino seesaw scenario, implying a strictly hierarchical light neutrino spectrum. A third decoupled RH neutrino, $N_{\rm DM}$ with mass $M_{\rm DM}$, plays the role of cold dark matter (DM) and is produced by the mixing with a source RH neutrino, $N_{\rm S}$ with mass $M_{\rm S}$, induced by Higgs portal interactions. The same interactions are also responsible for $N_{\rm DM}$ decays. We discuss in detail the constraints coming from DM abundance and stability conditions, showing that in the hierarchical case ($M_{\rm DM} \gg M_{\rm S}$) there is an allowed window on $M_{\rm DM}$, which necessarily implies a contribution from DM decays to the high-energy neutrino flux recently detected by IceCube. We also show how the model can explain the matter-antimatter asymmetry of the Universe via leptogenesis in the quasi-degenerate limit. In this case, the DM mass should be within the range 300 GeV $\lesssim M_{\rm S} < M_{\rm DM} \lesssim$ 10 PeV. We discuss the specific properties of this high-energy neutrino flux and show the predicted event spectrum for two exemplary cases. Although DM decays, with a relatively hard spectrum, cannot account for all the IceCube high-energy data, we illustrate how this extra source of high-energy neutrinos could reasonably explain some potential features in the observed spectrum. In this way, this represents a unified scenario for leptogenesis and DM that could be tested during the next years with more high-energy neutrino events. |
1808.10518 | A. B. Balantekin | A. Baha Balantekin, Andr\'e de Gouv\^ea, and Boris Kayser | Addressing the Majorana vs. Dirac Question with Neutrino Decays | 11 pages, 3 figures | null | 10.1016/j.physletb.2018.11.068 | FERMILAB-PUB-18-418-T, NUHEP-TH/18-09 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Majorana versus Dirac nature of neutrinos remains an open question. This
is due, in part, to the fact that virtually all the experimentally accessible
neutrinos are ultra-relativistic. Noting that Majorana neutrinos can behave
quite differently from Dirac ones when they are non-relativistic, we show that,
at leading order, the angular distribution of the daughters in the decay of a
heavy neutrino into a lighter one and a self-conjugate boson is isotropic in
the parent's rest frame if the neutrinos are Majorana, independent of the
parent's polarization. If the neutrinos are Dirac fermions, this is, in
general, not the case. This result follows from CPT invariance and is
independent of the details of the physics responsible for the decay. We explore
the feasibility of using these angular distributions -- or, equivalently, the
energy distributions of the daughters in the laboratory frame -- in order to
address the Majorana versus Dirac nature of neutrinos if a fourth, heavier
neutrino mass eigenstate reveals itself in the current or next-generation of
high-energy colliders, intense meson facilities, or neutrino beam experiments.
| [
{
"created": "Thu, 30 Aug 2018 21:01:43 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2018 20:32:44 GMT",
"version": "v2"
}
] | 2019-01-09 | [
[
"Balantekin",
"A. Baha",
""
],
[
"de Gouvêa",
"André",
""
],
[
"Kayser",
"Boris",
""
]
] | The Majorana versus Dirac nature of neutrinos remains an open question. This is due, in part, to the fact that virtually all the experimentally accessible neutrinos are ultra-relativistic. Noting that Majorana neutrinos can behave quite differently from Dirac ones when they are non-relativistic, we show that, at leading order, the angular distribution of the daughters in the decay of a heavy neutrino into a lighter one and a self-conjugate boson is isotropic in the parent's rest frame if the neutrinos are Majorana, independent of the parent's polarization. If the neutrinos are Dirac fermions, this is, in general, not the case. This result follows from CPT invariance and is independent of the details of the physics responsible for the decay. We explore the feasibility of using these angular distributions -- or, equivalently, the energy distributions of the daughters in the laboratory frame -- in order to address the Majorana versus Dirac nature of neutrinos if a fourth, heavier neutrino mass eigenstate reveals itself in the current or next-generation of high-energy colliders, intense meson facilities, or neutrino beam experiments. |
1911.01675 | Abdel Nasser Tawfik | Abdel Nasser Tawfik (Nile U., ECTP), Mahmoud Hanafy (Benha U. and
WLCAPP, Cairo), Werner Scheinast (LHEP JINR, Dubna) | Multiplicity per rapidity in Carruthers and hadron resonance gas
approaches | 16 pages, 2 figures, 2 tables submitted to UJP | null | 10.1007/s12648-021-02228-5 | ECTP-2019-15, WLCAPP-2019-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The multiplicity per rapidity of the well-identified particles $\pi^{-}$,
$\pi^{+}$, $k^{-}$, $k^{+}$, $\bar{p}$, $p$, and $p-\bar{p}$ measured in
different high-energy experiments, at energies ranging from $6.3$ to
$5500~$GeV, are successfully compared with the Cosmic Ray Monte Carlo (CRMC)
event generator. For these rapidity distributions, we introduce a theoretical
approach based on fluctuations and correlations (Carruthers) and another one
based on statistical thermal assumptions (hadron resonance gas model). Both
approaches are fitted to the two sets of results deduced from experiments and
simulations. We found that the Carruthers approach reproduces well the full
range of multiplicity per rapidity for all produced particles, at the various
energies, while the HRG approach fairly describes the results within a narrower
rapidity-range. While the Carruthers approach seems to match well with the
Gaussian normal distribution, ingredients such as flow and interactions should
be first incorporated in the HRG approach.
| [
{
"created": "Tue, 5 Nov 2019 09:11:18 GMT",
"version": "v1"
}
] | 2022-03-08 | [
[
"Tawfik",
"Abdel Nasser",
"",
"Nile U., ECTP"
],
[
"Hanafy",
"Mahmoud",
"",
"Benha U. and\n WLCAPP, Cairo"
],
[
"Scheinast",
"Werner",
"",
"LHEP JINR, Dubna"
]
] | The multiplicity per rapidity of the well-identified particles $\pi^{-}$, $\pi^{+}$, $k^{-}$, $k^{+}$, $\bar{p}$, $p$, and $p-\bar{p}$ measured in different high-energy experiments, at energies ranging from $6.3$ to $5500~$GeV, are successfully compared with the Cosmic Ray Monte Carlo (CRMC) event generator. For these rapidity distributions, we introduce a theoretical approach based on fluctuations and correlations (Carruthers) and another one based on statistical thermal assumptions (hadron resonance gas model). Both approaches are fitted to the two sets of results deduced from experiments and simulations. We found that the Carruthers approach reproduces well the full range of multiplicity per rapidity for all produced particles, at the various energies, while the HRG approach fairly describes the results within a narrower rapidity-range. While the Carruthers approach seems to match well with the Gaussian normal distribution, ingredients such as flow and interactions should be first incorporated in the HRG approach. |
2304.03305 | Oscar J. P. \'Eboli | Tyler Corbett, Jay Desai, O. J. P. Eboli, M. C. Gonzalez-Garcia,
Matheus Martines, and Peter Reimitz | Impact of dimension-eight SMEFT operators in the EWPO and Triple Gauge
Couplings analysis in Universal SMEFT | 17 pages and 3 figures | null | 10.1103/PhysRevD.107.115013 | YITP-SB-2023-04, FERMILAB-PUB-23-134-V, UWThPh 2023-13 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We perform a complete study of the electroweak precision observables and
electroweak gauge boson pair production in terms of the SMEFT up to ${\cal
O}(1/\Lambda^4)$ under the assumption of universal, C and P conserving new
physics. We show that the analysis of data from those two sectors allows us to
obtain closed constraints in the relevant parameter space in this scenario. In
particular we find that the Large Hadron Collider data can independently
constrain the Wilson coefficients of the dimension-six and -eight operators
directly contributing to the triple gauge boson vertices. Our results show that
the impact of dimension-eight operators in the study of triple gauge couplings
is small.
| [
{
"created": "Thu, 6 Apr 2023 18:00:02 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Corbett",
"Tyler",
""
],
[
"Desai",
"Jay",
""
],
[
"Eboli",
"O. J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Martines",
"Matheus",
""
],
[
"Reimitz",
"Peter",
""
]
] | We perform a complete study of the electroweak precision observables and electroweak gauge boson pair production in terms of the SMEFT up to ${\cal O}(1/\Lambda^4)$ under the assumption of universal, C and P conserving new physics. We show that the analysis of data from those two sectors allows us to obtain closed constraints in the relevant parameter space in this scenario. In particular we find that the Large Hadron Collider data can independently constrain the Wilson coefficients of the dimension-six and -eight operators directly contributing to the triple gauge boson vertices. Our results show that the impact of dimension-eight operators in the study of triple gauge couplings is small. |
hep-ph/0507141 | Miroslav Pardy | Miroslav Pardy | Volkov solution for two laser beams and ITER | 13 pages | Int.J.Theor.Phys. 45 (2006) 647-659 | 10.1007/s10773-006-9056-9 | MUNI-2005-27 | hep-ph | null | We find the solution of the Dirac equation for two plane waves (laser beams)
and we determine the modified Compton formula for the scattering of two photons
on an alectron. The practical meaning of the two laser beams is, that two laser
beams impinging on a targed which is constituted from material in the form of a
foam, can replace 100-200 laser beams impinging on a normal targed. It means
that the nuclear fusion with two laser beams is realistic in combination with
the nuclear reactor such as ITER.
| [
{
"created": "Tue, 12 Jul 2005 08:32:49 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Pardy",
"Miroslav",
""
]
] | We find the solution of the Dirac equation for two plane waves (laser beams) and we determine the modified Compton formula for the scattering of two photons on an alectron. The practical meaning of the two laser beams is, that two laser beams impinging on a targed which is constituted from material in the form of a foam, can replace 100-200 laser beams impinging on a normal targed. It means that the nuclear fusion with two laser beams is realistic in combination with the nuclear reactor such as ITER. |
1801.08037 | Daniel Dercks | Daniel Dercks and Gudrid Moortgat-Pick | Automatised ILC-Bounds on Dark Matter Models with CheckMATE | 10 pages, 7 figures; Talk presented at the International Workshop on
Future Linear Colliders (LCWS2017), Strasbourg, France, 23-27 October 2017.
C17-10-23.2 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The public collider phenomenology computing tool CheckMATE (Check Models at
Terascale Energies) was originally designed to allow theorists to quickly test
their favourite BSM models against various existing LHC analyses performed by
ATLAS and CMS. It offers an automatised chain of Monte Carlo event generation,
detector simulation, event analysis and statistical evaluation so that it can
automatically determine whether a given parameter point of a BSM model is
excluded or not. Currently, it contains more than 50 individual ATLAS or CMS
analyses whose several hundred signal regions target various final states as
they typically appear in theories beyond the Standard Model. In this study, we
extend this functionality to allow sensitivity studies for the International
Linear Collider. As an example, we implemente a dark matter monophoton search
and use it to analyse three benchmark scenarios with different assumptions
about the interaction between dark matter and Standard Model particles. We
determine the ILC sensitivity expected for a $\sqrt{s} =$ 500 GeV, $L = 500$
fb$^{-1}$and compare the results for the cases of completely unpolarised beams
and for individual lepton polarisation settings.
| [
{
"created": "Wed, 24 Jan 2018 15:47:20 GMT",
"version": "v1"
}
] | 2018-01-25 | [
[
"Dercks",
"Daniel",
""
],
[
"Moortgat-Pick",
"Gudrid",
""
]
] | The public collider phenomenology computing tool CheckMATE (Check Models at Terascale Energies) was originally designed to allow theorists to quickly test their favourite BSM models against various existing LHC analyses performed by ATLAS and CMS. It offers an automatised chain of Monte Carlo event generation, detector simulation, event analysis and statistical evaluation so that it can automatically determine whether a given parameter point of a BSM model is excluded or not. Currently, it contains more than 50 individual ATLAS or CMS analyses whose several hundred signal regions target various final states as they typically appear in theories beyond the Standard Model. In this study, we extend this functionality to allow sensitivity studies for the International Linear Collider. As an example, we implemente a dark matter monophoton search and use it to analyse three benchmark scenarios with different assumptions about the interaction between dark matter and Standard Model particles. We determine the ILC sensitivity expected for a $\sqrt{s} =$ 500 GeV, $L = 500$ fb$^{-1}$and compare the results for the cases of completely unpolarised beams and for individual lepton polarisation settings. |
hep-ph/0011115 | Sang Pyo Kim | Sang Pyo Kim (Univ. of Alberta, Kunsan Nat'l Univ.) and F. C. Khanna
(Univ. of Alberta) | Non-Gaussian Effects on Domain Growth | RevTex 9 pages, no figure; main part is rewritten to control the
global behavior of perturbation; format changed | null | null | null | hep-ph cond-mat.stat-mech hep-th nucl-th | null | The vacuum two-point function is calculated beyond the Gaussian approximation
during the second order phase transition. It is found that the correlation
function is dominated by the Gaussian term immediately after the phase
transition but later is taken over by non-Gaussian terms as the spinodal
instability continues. The non-Gaussian effects lead to larger size of domains
and may imply a smaller density of topological defects than that predicted by
the Hartree-Fock approximation.
| [
{
"created": "Wed, 8 Nov 2000 23:22:38 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2001 21:06:39 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Jan 2002 18:31:52 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Kim",
"Sang Pyo",
"",
"Univ. of Alberta, Kunsan Nat'l Univ."
],
[
"Khanna",
"F. C.",
"",
"Univ. of Alberta"
]
] | The vacuum two-point function is calculated beyond the Gaussian approximation during the second order phase transition. It is found that the correlation function is dominated by the Gaussian term immediately after the phase transition but later is taken over by non-Gaussian terms as the spinodal instability continues. The non-Gaussian effects lead to larger size of domains and may imply a smaller density of topological defects than that predicted by the Hartree-Fock approximation. |
hep-ph/9504343 | null | David Saltzberg (CERN-PPE Division) | COMMENT ON THE KAMIOKANDE ATMOSPHERIC NEUTRINO DEFICIT | 2pp. LATEX format. No figures. Postscript available at
ftp://fnald.fnal.gov/usr$root39/saltzberg/nu.ps | Phys.Lett.B355:499-500,1995 | 10.1016/0370-2693(95)00766-E | null | hep-ph | null | I describe an attempt to understand the significance of the atmospheric
neutrino deficit observed by the Kamiokande neutrino detector. In particular, I
am concerned with the statistical significance quoted for the zenith-angle
dependence of the deficit, which has been cited as evidence for neutrino flavor
oscillations free of systematic uncertainties.
| [
{
"created": "Wed, 19 Apr 1995 16:34:36 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Saltzberg",
"David",
"",
"CERN-PPE Division"
]
] | I describe an attempt to understand the significance of the atmospheric neutrino deficit observed by the Kamiokande neutrino detector. In particular, I am concerned with the statistical significance quoted for the zenith-angle dependence of the deficit, which has been cited as evidence for neutrino flavor oscillations free of systematic uncertainties. |
1505.02763 | A. F. W. van Hameren | A. van Hameren, P. Kotko, K. Kutak | Resummation effects in forward production of Z0+jet at LHC | 16 pages | Phys. Rev. D 92, 054007 (2015) | 10.1103/PhysRevD.92.054007 | IFJPAN-IV-2015-8 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate several differential cross sections for Z0 and high-pT jet
production in the forward rapidity region at the LHC using the hybrid High
Energy Factorization. We test various unintegrated gluon distributions
involving subleading BFKL effects (such as kinematic constraint, running strong
coupling and DGLAP correction) and compare the results with experimental data
obtained by the LHCb experiment. We find that the hard scale dependence of
unintegrated gluon distributions, which effectively resums the Sudakov-type
logarithms on the top of the resummation of the small x logarithms, is
essential to describe the normalized azimuthal decorrelations between the
Z0-boson and the jet.
| [
{
"created": "Mon, 11 May 2015 19:56:22 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2015 19:22:10 GMT",
"version": "v2"
}
] | 2015-09-16 | [
[
"van Hameren",
"A.",
""
],
[
"Kotko",
"P.",
""
],
[
"Kutak",
"K.",
""
]
] | We calculate several differential cross sections for Z0 and high-pT jet production in the forward rapidity region at the LHC using the hybrid High Energy Factorization. We test various unintegrated gluon distributions involving subleading BFKL effects (such as kinematic constraint, running strong coupling and DGLAP correction) and compare the results with experimental data obtained by the LHCb experiment. We find that the hard scale dependence of unintegrated gluon distributions, which effectively resums the Sudakov-type logarithms on the top of the resummation of the small x logarithms, is essential to describe the normalized azimuthal decorrelations between the Z0-boson and the jet. |
2208.02276 | Francesco Hautmann | A. Bermudez Martinez, F. Hautmann and M.L. Mangano | Multi-jet Merging with TMD Parton Branching | Latex, 43 pages; version v2: typos corrected, additional comments and
references inserted | null | 10.1007/JHEP09(2022)060 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the main theoretical systematics in studies of final states with large
jet multiplicities at high-energy hadron colliders is associated with the
merging of QCD parton showers and hard-scattering matrix elements. We present a
method to incorporate the physics of transverse momentum recoils due to
initial-state shower evolution into multi-jet merging algorithms by using the
concept of transverse momentum dependent (TMD) distributions and the associated
parton branching. We investigate the dependence on the merging scale and
illustrate the impact of the new method at the level of both exclusive and
inclusive final-state observables by studying differential jet rates,
transverse momentum spectra and multiplicity distributions, using vector boson
+ jets events at the LHC as a case study.
| [
{
"created": "Wed, 3 Aug 2022 18:01:02 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Sep 2022 17:48:30 GMT",
"version": "v2"
}
] | 2022-09-28 | [
[
"Martinez",
"A. Bermudez",
""
],
[
"Hautmann",
"F.",
""
],
[
"Mangano",
"M. L.",
""
]
] | One of the main theoretical systematics in studies of final states with large jet multiplicities at high-energy hadron colliders is associated with the merging of QCD parton showers and hard-scattering matrix elements. We present a method to incorporate the physics of transverse momentum recoils due to initial-state shower evolution into multi-jet merging algorithms by using the concept of transverse momentum dependent (TMD) distributions and the associated parton branching. We investigate the dependence on the merging scale and illustrate the impact of the new method at the level of both exclusive and inclusive final-state observables by studying differential jet rates, transverse momentum spectra and multiplicity distributions, using vector boson + jets events at the LHC as a case study. |
hep-ph/0111048 | Jiunn-Wei Chen | Jiunn-Wei Chen and Xiangdong Ji | Leading Chiral Contributions to the Spin Structure of the Proton | 8 pages, 2 figures; a typo in Ref. 7 corrected | Phys.Rev.Lett. 88 (2002) 052003 | 10.1103/PhysRevLett.88.052003 | UMD-PP-02-020 | hep-ph hep-lat nucl-th | null | The leading chiral contributions to the quark and gluon components of the
proton spin are calculated using heavy-baryon chiral perturbation theory.
Similar calculations are done for the moments of the generalized parton
distributions relevant to the quark and gluon angular momentum densities. These
results provide useful insight about the role of pions in the spin structure of
the nucleon, and can serve as a guidance for extrapolating lattice QCD
calculations at large quark masses to the chiral limit.
| [
{
"created": "Tue, 6 Nov 2001 19:50:59 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Dec 2001 19:57:52 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Chen",
"Jiunn-Wei",
""
],
[
"Ji",
"Xiangdong",
""
]
] | The leading chiral contributions to the quark and gluon components of the proton spin are calculated using heavy-baryon chiral perturbation theory. Similar calculations are done for the moments of the generalized parton distributions relevant to the quark and gluon angular momentum densities. These results provide useful insight about the role of pions in the spin structure of the nucleon, and can serve as a guidance for extrapolating lattice QCD calculations at large quark masses to the chiral limit. |
2106.09474 | Joseph Aylett-Bullock | Joseph Aylett-Bullock, Simon Badger, Ryan Moodie | Optimising simulations for diphoton production at hadron colliders using
amplitude neural networks | 31 pages, 12 figures, 2 tables | null | 10.1007/JHEP08(2021)066 | null | hep-ph cs.AI cs.LG | http://creativecommons.org/licenses/by/4.0/ | Machine learning technology has the potential to dramatically optimise event
generation and simulations. We continue to investigate the use of neural
networks to approximate matrix elements for high-multiplicity scattering
processes. We focus on the case of loop-induced diphoton production through
gluon fusion and develop a realistic simulation method that can be applied to
hadron collider observables. Neural networks are trained using the one-loop
amplitudes implemented in the NJet C++ library and interfaced to the Sherpa
Monte Carlo event generator where we perform a detailed study for $2\to3$ and
$2\to4$ scattering problems. We also consider how the trained networks perform
when varying the kinematic cuts effecting the phase space and the reliability
of the neural network simulations.
| [
{
"created": "Thu, 17 Jun 2021 13:24:36 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2021 10:25:05 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Aylett-Bullock",
"Joseph",
""
],
[
"Badger",
"Simon",
""
],
[
"Moodie",
"Ryan",
""
]
] | Machine learning technology has the potential to dramatically optimise event generation and simulations. We continue to investigate the use of neural networks to approximate matrix elements for high-multiplicity scattering processes. We focus on the case of loop-induced diphoton production through gluon fusion and develop a realistic simulation method that can be applied to hadron collider observables. Neural networks are trained using the one-loop amplitudes implemented in the NJet C++ library and interfaced to the Sherpa Monte Carlo event generator where we perform a detailed study for $2\to3$ and $2\to4$ scattering problems. We also consider how the trained networks perform when varying the kinematic cuts effecting the phase space and the reliability of the neural network simulations. |
1212.0789 | Marc Sher | Marc Sher | Review of prospects for H^+ in non-SUSY multi-Higgs models in view of
LHC results | 8 pages. Talk given at "Prospects for Charged Higgs Discovery at
Colliders", October 2012, Uppsala, Sweden | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, prospects for the charged Higgs in non-SUSY models are
reviewed, in view of LHC results (as of October, 2012). The four models (Type
I, Type II, lepton-specific and flipped) without tree level flavor-changing
neutral currents are discussed. Updates for the case in which the charged Higgs
is lighter than the top, leading to production in top decays, are presented
along with expectations for the future. If the charged Higgs is heavier than
the top quark, detection may be possible through the tau-nu decay mode. In
addition, it is pointed out that the decay of the charged Higgs into W h, where
h is the 125 GeV state, may be dominant. Charged Higgs phenomenology in models
which do contain tree level flavor-changing neutral currents, as well as the
inert doublet model and others, are also briefly reviewed.
| [
{
"created": "Tue, 4 Dec 2012 17:07:38 GMT",
"version": "v1"
}
] | 2012-12-05 | [
[
"Sher",
"Marc",
""
]
] | In this talk, prospects for the charged Higgs in non-SUSY models are reviewed, in view of LHC results (as of October, 2012). The four models (Type I, Type II, lepton-specific and flipped) without tree level flavor-changing neutral currents are discussed. Updates for the case in which the charged Higgs is lighter than the top, leading to production in top decays, are presented along with expectations for the future. If the charged Higgs is heavier than the top quark, detection may be possible through the tau-nu decay mode. In addition, it is pointed out that the decay of the charged Higgs into W h, where h is the 125 GeV state, may be dominant. Charged Higgs phenomenology in models which do contain tree level flavor-changing neutral currents, as well as the inert doublet model and others, are also briefly reviewed. |
2104.14626 | Simone Biondini | Simone Biondini | Revisiting freeze-in dark matter from renormalizable operators | Proceedings of the (online) BSM-2021 Conference to appear in LHEP | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this conference paper we summarise the findings of a recent study, where
the impact of the ultra-relativistic regime on the production of a feebly
interacting dark matter particle is considered. As its population accumulates
over the thermal history, we inspected thoroughly the temperature window $T \gg
M$, which has been previously neglected in the context of dark matter models
with renormalizable operators. At high temperatures, and for the model
considered in our work, the production rate of the feebly interacting particle
is driven by multiple soft scatterings, as well as $2 \to 2$ processes, that
can give a large contribution to the dark matter energy density.
| [
{
"created": "Thu, 29 Apr 2021 19:26:30 GMT",
"version": "v1"
}
] | 2021-05-03 | [
[
"Biondini",
"Simone",
""
]
] | In this conference paper we summarise the findings of a recent study, where the impact of the ultra-relativistic regime on the production of a feebly interacting dark matter particle is considered. As its population accumulates over the thermal history, we inspected thoroughly the temperature window $T \gg M$, which has been previously neglected in the context of dark matter models with renormalizable operators. At high temperatures, and for the model considered in our work, the production rate of the feebly interacting particle is driven by multiple soft scatterings, as well as $2 \to 2$ processes, that can give a large contribution to the dark matter energy density. |
2401.01358 | Patricio Gaete | Patricio Gaete and Jos\'e Abdalla Helay\"el-Neto | QED-vacuum response and Cherenkov radiated energy in non-linear and
Lorentz-symmetry violating scenarios | 22 pages | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate physical consequences of non-linear electrodynamic coupled to
parameters that signal violation Lorentz-symmetry breaking (LSV). Our
undertaking is done by considering a general non-linear photonic Lagrangian
which coupled to the Carroll-Field-Jackiw's model (CFJ). Our endeavor reveals
how the (meta) material constitutive properties of the vacuum and wave
propagation are affected by the interference of the LSV parameters LSV with the
specific non-linear electrodynamic model under consideration. We also discuss
the refractive indices for this new medium characterized by the coupling
between non-linearities and the operators that carry the LSV message. Our
results show that the QED-vacuum responds with birefringence and a dispersive
propagation of waves. Subsequently, we consider the electromagnetic radiation
produced by a moving charged particle interacting with this new medium. Our
inspection illustrates that the emitted radiation reproduces the features of
the Cherenkov effect for certain intensities of background magnetic fields .
Finally, we compute the static potential profile within the framework of the
gauge-invariant, but path-dependent, variables formalism. A logarithmic
correction to the usual static Coulomb potential emerges driven by the LSV
parameter and there also appear corrections due to the non-linearity;
nevertheless, the logarithm behavior drops out whenever the LSV parameter is
switched off.
| [
{
"created": "Tue, 12 Dec 2023 17:55:52 GMT",
"version": "v1"
}
] | 2024-01-04 | [
[
"Gaete",
"Patricio",
""
],
[
"Helayël-Neto",
"José Abdalla",
""
]
] | We investigate physical consequences of non-linear electrodynamic coupled to parameters that signal violation Lorentz-symmetry breaking (LSV). Our undertaking is done by considering a general non-linear photonic Lagrangian which coupled to the Carroll-Field-Jackiw's model (CFJ). Our endeavor reveals how the (meta) material constitutive properties of the vacuum and wave propagation are affected by the interference of the LSV parameters LSV with the specific non-linear electrodynamic model under consideration. We also discuss the refractive indices for this new medium characterized by the coupling between non-linearities and the operators that carry the LSV message. Our results show that the QED-vacuum responds with birefringence and a dispersive propagation of waves. Subsequently, we consider the electromagnetic radiation produced by a moving charged particle interacting with this new medium. Our inspection illustrates that the emitted radiation reproduces the features of the Cherenkov effect for certain intensities of background magnetic fields . Finally, we compute the static potential profile within the framework of the gauge-invariant, but path-dependent, variables formalism. A logarithmic correction to the usual static Coulomb potential emerges driven by the LSV parameter and there also appear corrections due to the non-linearity; nevertheless, the logarithm behavior drops out whenever the LSV parameter is switched off. |
hep-ph/0106154 | John F. Gunion | John F. Gunion | Hunting the Higgs Boson(s) | 26 pages, 9 figures; based on presentations at RADCOR--2000 and
PASCOS--2001 | null | null | null | hep-ph | null | I give a brief review of some of the opportunities and challenges that could
arise in our quest to unravel the Higgs sector that very probably underlies
electroweak symmetry breaking. In particular, I review scenarios with an
extended Higgs sector that allow for a heavy SM-like Higgs boson and/or make
discovery more difficult while at the same time maintaining consistency with
current limits and precision electroweak constraints.
| [
{
"created": "Thu, 14 Jun 2001 17:42:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gunion",
"John F.",
""
]
] | I give a brief review of some of the opportunities and challenges that could arise in our quest to unravel the Higgs sector that very probably underlies electroweak symmetry breaking. In particular, I review scenarios with an extended Higgs sector that allow for a heavy SM-like Higgs boson and/or make discovery more difficult while at the same time maintaining consistency with current limits and precision electroweak constraints. |
1006.5614 | Gijs Oord van den | Ronald Kleiss and Gijs van den Oord | CAMORRA: a C++ library for recursive computation of particle scattering
amplitudes | 22 pages | Comput.Phys.Commun.182:435-447,2011 | 10.1016/j.cpc.2010.09.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new Monte Carlo tool that computes full tree-level matrix
elements in high-energy physics. The program accepts user-defined models and
has no restrictions on the process multiplicity. To achieve acceptable
performance, CAMORRA evaluates the matrix elements in a recursive way by
combining off-shell currents. Furthermore, CAMORRA can be used to compute
amplitudes involving continuous color and helicity final states.
| [
{
"created": "Tue, 29 Jun 2010 13:43:38 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Kleiss",
"Ronald",
""
],
[
"Oord",
"Gijs van den",
""
]
] | We present a new Monte Carlo tool that computes full tree-level matrix elements in high-energy physics. The program accepts user-defined models and has no restrictions on the process multiplicity. To achieve acceptable performance, CAMORRA evaluates the matrix elements in a recursive way by combining off-shell currents. Furthermore, CAMORRA can be used to compute amplitudes involving continuous color and helicity final states. |
0804.2428 | Michael Rauch | Michael Rauch | Quantum Effects in Higgs-Boson Production Processes at Hadron Colliders | 167 pages, 124 figures; PhD thesis | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for Higgs bosons and extensions of the Standard Model of
Elementary Particle Physics are main tasks of the Large Hadron Collider (LHC)
at CERN which will start operation mid-2008. In this thesis processes which can
be used to detect supersymmetric Higgs bosons at the LHC were considered. First
a computer program was written which completes the toolbox for automatic
calculations of hadronic cross sections. Using this program, the supersymmetric
QCD corrections to associated H-W+-production and h0-production via
vector-boson fusion and in association with heavy quarks were calculated. The
corrections partly give significant contributions to the total cross section.
Additionally, the possibility to measure the quartic Higgs self-coupling via
triple-Higgs production was investigated and found to be challenging.
| [
{
"created": "Tue, 15 Apr 2008 15:23:24 GMT",
"version": "v1"
}
] | 2008-04-16 | [
[
"Rauch",
"Michael",
""
]
] | The search for Higgs bosons and extensions of the Standard Model of Elementary Particle Physics are main tasks of the Large Hadron Collider (LHC) at CERN which will start operation mid-2008. In this thesis processes which can be used to detect supersymmetric Higgs bosons at the LHC were considered. First a computer program was written which completes the toolbox for automatic calculations of hadronic cross sections. Using this program, the supersymmetric QCD corrections to associated H-W+-production and h0-production via vector-boson fusion and in association with heavy quarks were calculated. The corrections partly give significant contributions to the total cross section. Additionally, the possibility to measure the quartic Higgs self-coupling via triple-Higgs production was investigated and found to be challenging. |
1602.02776 | Franco D. Albareti | Franco D. Albareti, Antonio L. Maroto, Francisco Prada | Gravitational perturbations of the Higgs field | 15 pages. Version accepted for publication in PRD. Error corrected in
the angular integration in Appendix B. Conclusions changed. New section
included | Phys. Rev. D 95, 044030 (2017) | 10.1103/PhysRevD.95.044030 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possible effects of classical gravitational backgrounds on the
Higgs field through the modifications induced in the one-loop effective
potential and the vacuum expectation value of the energy-momentum tensor. We
concentrate our study on the Higgs self-interaction contribution in a perturbed
FRW metric. For weak and slowly varying gravitational fields, a complete set of
mode solutions for the Klein-Gordon equation is obtained to leading order in
the adiabatic approximation. Dimensional regularization has been used in the
integral evaluation and a detailed study of the integration of nonrational
functions in this formalism has been presented. As expected, the regularized
effective potential contains the same divergences as in flat spacetime, which
can be renormalized without the need of additional counterterms. We find that,
in contrast with other regularization methods, even though metric perturbations
affect the mode solutions, they do not contribute to the leading adiabatic
order of the potential. We also obtain explicit expressions of the complete
energy-momentum tensor for general nonminimal coupling in terms of the
perturbed modes. The corresponding leading adiabatic contributions are also
obtained.
| [
{
"created": "Mon, 8 Feb 2016 21:01:07 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2017 20:18:45 GMT",
"version": "v2"
}
] | 2017-03-01 | [
[
"Albareti",
"Franco D.",
""
],
[
"Maroto",
"Antonio L.",
""
],
[
"Prada",
"Francisco",
""
]
] | We study the possible effects of classical gravitational backgrounds on the Higgs field through the modifications induced in the one-loop effective potential and the vacuum expectation value of the energy-momentum tensor. We concentrate our study on the Higgs self-interaction contribution in a perturbed FRW metric. For weak and slowly varying gravitational fields, a complete set of mode solutions for the Klein-Gordon equation is obtained to leading order in the adiabatic approximation. Dimensional regularization has been used in the integral evaluation and a detailed study of the integration of nonrational functions in this formalism has been presented. As expected, the regularized effective potential contains the same divergences as in flat spacetime, which can be renormalized without the need of additional counterterms. We find that, in contrast with other regularization methods, even though metric perturbations affect the mode solutions, they do not contribute to the leading adiabatic order of the potential. We also obtain explicit expressions of the complete energy-momentum tensor for general nonminimal coupling in terms of the perturbed modes. The corresponding leading adiabatic contributions are also obtained. |
2105.07928 | Yufeng Li | Ziyi Yuan, Yu-Feng Li, Xiang Zhou | Spin Flavor Spectral Splits of Supernova Neutrino Flavor Conversions | 10 pages, 4 figures | null | null | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The supernova neutrino flavor evolution in the presence of the non-trivial
neutrino magnetic moment and strong magnetic field is numerically derived using
the two-flavor and single-angle approximation. The novel properties of
collective neutrino oscillations are studied and distinct patterns of flavor
and spin-flavor spectral splits are presented. Finally we also discuss how the
neutrino magnetic moment affects the observable supernova neutrino energy
spectra.
| [
{
"created": "Mon, 17 May 2021 15:06:04 GMT",
"version": "v1"
}
] | 2021-05-18 | [
[
"Yuan",
"Ziyi",
""
],
[
"Li",
"Yu-Feng",
""
],
[
"Zhou",
"Xiang",
""
]
] | The supernova neutrino flavor evolution in the presence of the non-trivial neutrino magnetic moment and strong magnetic field is numerically derived using the two-flavor and single-angle approximation. The novel properties of collective neutrino oscillations are studied and distinct patterns of flavor and spin-flavor spectral splits are presented. Finally we also discuss how the neutrino magnetic moment affects the observable supernova neutrino energy spectra. |
1808.00833 | Mikhail Braun | M.A. Braun and C. Pajares | $p_t$- dependence of the flow coefficients for pp collisions in the
color string scenario. Monte-Carlo simulations | 10 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1407.4590 | null | 10.1140/epja/i2018-12616-1 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the color string picture with fusion and percolation the dependence of the
flow coefficients $v_n$ on the transverse momentum is studied for pp collisions
the LHC energy respectively. Monte-Carlo simulations are used to locate simple
strings and their fused clusters. The results favorably agree with the CMS data
in the region $0.2 \le p_t\le 3.$ GeV/c appropriate for the string scenario.
| [
{
"created": "Wed, 1 Aug 2018 08:56:08 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Braun",
"M. A.",
""
],
[
"Pajares",
"C.",
""
]
] | In the color string picture with fusion and percolation the dependence of the flow coefficients $v_n$ on the transverse momentum is studied for pp collisions the LHC energy respectively. Monte-Carlo simulations are used to locate simple strings and their fused clusters. The results favorably agree with the CMS data in the region $0.2 \le p_t\le 3.$ GeV/c appropriate for the string scenario. |
1304.3773 | Alan Jamison | Alan O. Jamison | Effects of gravitational confinement on bosonic asymmetric dark matter
in stars | 2 pages, typos fixed to match published version | Phys. Rev. D 88, 035004 (2013) | 10.1103/PhysRevD.88.035004 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the existence of old neutron stars puts strong limits on the dark
matter/nucleon cross section for bosonic asymmetric dark matter. Key to these
bounds is formation of a Bose-Einstein condensate (BEC) of the asymmetric dark
matter particles. We consider the effects of the host neutron star's
gravitational field on the BEC transition. We find this substantially shifts
the transition temperature and so strengthens the bounds on cross section. In
particular, for the well-motivated mass range of ~5-15 GeV, we improve previous
bounds by an order of magnitude.
| [
{
"created": "Sat, 13 Apr 2013 04:22:29 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2014 06:28:27 GMT",
"version": "v2"
}
] | 2014-01-09 | [
[
"Jamison",
"Alan O.",
""
]
] | Considering the existence of old neutron stars puts strong limits on the dark matter/nucleon cross section for bosonic asymmetric dark matter. Key to these bounds is formation of a Bose-Einstein condensate (BEC) of the asymmetric dark matter particles. We consider the effects of the host neutron star's gravitational field on the BEC transition. We find this substantially shifts the transition temperature and so strengthens the bounds on cross section. In particular, for the well-motivated mass range of ~5-15 GeV, we improve previous bounds by an order of magnitude. |
hep-ph/0408161 | Christian Bauer | Christian W. Bauer and Dan Pirjol | Graphical amplitudes from SCET | 7 pages; one additional relation included, minor corrections. version
published in Physics Letters B | Phys.Lett. B604 (2004) 183-191 | 10.1016/j.physletb.2004.10.047 | null | hep-ph | null | We discuss the relationship between the graphical amplitudes T, C, P, ...
used to parameterize nonleptonic B decay amplitudes, and matrix elements of
operators in the soft-collinear effective theory (SCET) at leading order in
\Lambda/m_b. Using the SU(3) flavor symmetry of the weak Hamiltonian we derive
all-order constraints on the electroweak penguin contributions to the Wilson
coefficients of SCET operators.
| [
{
"created": "Fri, 13 Aug 2004 22:27:49 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jan 2005 02:17:10 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bauer",
"Christian W.",
""
],
[
"Pirjol",
"Dan",
""
]
] | We discuss the relationship between the graphical amplitudes T, C, P, ... used to parameterize nonleptonic B decay amplitudes, and matrix elements of operators in the soft-collinear effective theory (SCET) at leading order in \Lambda/m_b. Using the SU(3) flavor symmetry of the weak Hamiltonian we derive all-order constraints on the electroweak penguin contributions to the Wilson coefficients of SCET operators. |
1905.06601 | Rafiqul Rahaman | Satendra Kumar, Poulose Poulose, Rafiqul Rahaman and Ritesh K. Singh | Measuring Higgs self couplings in the presence of VVH and VVHH at the
ILC | 18 pages, 13 figures and 1 table. This version supersedes
arXiv:1408.3563 | null | 10.1142/S0217751X19500945 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of a Higgs boson at the LHC, while establishing the
Higgs mechanism as the way of electroweak symmetry breaking, started an era of
precision measurements involving the Higgs boson. In an effective Lagrangian
framework, we consider the $e^+e^-\rightarrow ZHH$ process at the ILC running
at a centre of mass energy of 500 GeV to investigate the effect of the $ZZH$
and $ZZHH$ couplings on the sensitivity of $HHH$ coupling in this process. Our
results show that the sensitivity of the trilinear Higgs self couplings on this
process has somewhat strong dependence on the Higgs-gauge boson couplings.
Single and two parameter reach of the ILC with an integrated luminosity of 1000
fb$^{-1}$ are obtained on all the effective couplings indicating how these
limits are affected by the presence of anomalous $ZZH$ and $ZZHH$ couplings.
The kinematic distributions studied to understand the effect of the anomalous
couplings, again, show a strong influence of $Z$-$H$ couplings on the
dependence of these distributions on $HHH$ coupling. Similar results are
indicated in the case of the process, $e^+e^-\rightarrow \nu\bar \nu HH$,
considered at a centre of mass energy of 2 TeV, where the cross section is
large enough. The effect of $WWH$ and $WWHH$ couplings on the sensitivity of
$HHH$ coupling is clearly established through our analyses in this process.
| [
{
"created": "Thu, 16 May 2019 08:48:53 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Kumar",
"Satendra",
""
],
[
"Poulose",
"Poulose",
""
],
[
"Rahaman",
"Rafiqul",
""
],
[
"Singh",
"Ritesh K.",
""
]
] | The recent discovery of a Higgs boson at the LHC, while establishing the Higgs mechanism as the way of electroweak symmetry breaking, started an era of precision measurements involving the Higgs boson. In an effective Lagrangian framework, we consider the $e^+e^-\rightarrow ZHH$ process at the ILC running at a centre of mass energy of 500 GeV to investigate the effect of the $ZZH$ and $ZZHH$ couplings on the sensitivity of $HHH$ coupling in this process. Our results show that the sensitivity of the trilinear Higgs self couplings on this process has somewhat strong dependence on the Higgs-gauge boson couplings. Single and two parameter reach of the ILC with an integrated luminosity of 1000 fb$^{-1}$ are obtained on all the effective couplings indicating how these limits are affected by the presence of anomalous $ZZH$ and $ZZHH$ couplings. The kinematic distributions studied to understand the effect of the anomalous couplings, again, show a strong influence of $Z$-$H$ couplings on the dependence of these distributions on $HHH$ coupling. Similar results are indicated in the case of the process, $e^+e^-\rightarrow \nu\bar \nu HH$, considered at a centre of mass energy of 2 TeV, where the cross section is large enough. The effect of $WWH$ and $WWHH$ couplings on the sensitivity of $HHH$ coupling is clearly established through our analyses in this process. |
hep-ph/9412370 | null | D.A.Dicus, B.Dutta and S.Nandi | Top Quark Signature in Extended Color Theories | 21 pages, Latex, Figures available on request | Phys.Rev. D51 (1995) 6085-6091 | 10.1103/PhysRevD.51.6085 | OSU-292, DOE-ER 40757, CPP-94-36-059 | hep-ph | null | We consider the implications of an extended color group, $SU\left( 3\right)
_I\times SU\left( 3\right) _{II}$, spontaneously broken to $SU\left( 3\right)
_c$ at a TeV or lower scale, for the hadronic colliders. The associated massive
color octet gauge bosons (the colorons) can enhance the $t \overline{t}$ pair
production at the Tevatron collider. At the LHC, the colorons can be pair
produced, each decaying to a $t\overline{t}$ pair. This gives rise to anomalous
multi W production: a clear signature of physics beyond the Standard Model. We
calculate the associated multijet and multilepton final states at the Tevatron
and the LHC energies, and compare these with the expectations from the Standard
Model.
| [
{
"created": "Mon, 26 Dec 1994 07:05:51 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Dicus",
"D. A.",
""
],
[
"Dutta",
"B.",
""
],
[
"Nandi",
"S.",
""
]
] | We consider the implications of an extended color group, $SU\left( 3\right) _I\times SU\left( 3\right) _{II}$, spontaneously broken to $SU\left( 3\right) _c$ at a TeV or lower scale, for the hadronic colliders. The associated massive color octet gauge bosons (the colorons) can enhance the $t \overline{t}$ pair production at the Tevatron collider. At the LHC, the colorons can be pair produced, each decaying to a $t\overline{t}$ pair. This gives rise to anomalous multi W production: a clear signature of physics beyond the Standard Model. We calculate the associated multijet and multilepton final states at the Tevatron and the LHC energies, and compare these with the expectations from the Standard Model. |
hep-ph/9811487 | Katsuji Yamamoto | K. Yamamoto and S. Matsuki | Quantum Analysis of Rydberg Atom Cavity Detector for Dark Matter Axion
Search | 6 pages, 4 figures, Invited talk presented at the IDM'98, Buxton, UK,
7-11 September, 1998, latex, sprocl.sty | null | null | NEAP-55 | hep-ph | null | Quantum analysis is made on the dynamical system consisting of the cosmic
axions, photons and Rydberg atoms which are interacting in the resonant cavity.
The atomic motion in a continuous incident beam is taken into account properly
in order to make a precise estimate of the efficiency of the Rydberg atom
cavity detector for dark matter axion search.
| [
{
"created": "Fri, 27 Nov 1998 02:38:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yamamoto",
"K.",
""
],
[
"Matsuki",
"S.",
""
]
] | Quantum analysis is made on the dynamical system consisting of the cosmic axions, photons and Rydberg atoms which are interacting in the resonant cavity. The atomic motion in a continuous incident beam is taken into account properly in order to make a precise estimate of the efficiency of the Rydberg atom cavity detector for dark matter axion search. |
hep-ph/0408092 | Umberto D'Alesio | Umberto D'Alesio and Francesco Murgia (University and INFN, Cagliari,
Italy) | Parton intrinsic motion in inclusive particle production: unpolarized
cross sections, single spin asymmetries and the Sivers effect | RevTeX, 29 pages, 20 ps figures | Phys.Rev.D70:074009,2004 | 10.1103/PhysRevD.70.074009 | null | hep-ph | null | The relevance of intrinsic (or primordial) transverse momentum of partons in
the inclusive production of particles at high energy and moderately large p_T
has been known for a long time, beginning with Drell-Yan and diphoton
processes, and continuing with photon and meson production in hadronic
collisions. In view of its renewed interest in the context of polarized
processes and single spin asymmetries we perform, in the framework of
perturbative QCD with the inclusion of spin and transverse momentum effects, a
detailed analysis of several such processes in different kinematical
situations. We show that the inclusion of these effects leads, at the level of
accuracy reachable in this approach, to an overall satisfactory agreement
between theoretical predictions and experimental unpolarized data, thus giving
support to the study of spin effects and single spin asymmetries within the
same scheme. We present results for transverse single spin asymmetries,
generated by the so-called Sivers effect, in inclusive pion and photon
production in proton-proton collisions. We compare our results with the
available experimental data and with previous results obtained using simplified
versions of this approach.
| [
{
"created": "Fri, 6 Aug 2004 18:21:04 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"D'Alesio",
"Umberto",
"",
"University and INFN, Cagliari,\n Italy"
],
[
"Murgia",
"Francesco",
"",
"University and INFN, Cagliari,\n Italy"
]
] | The relevance of intrinsic (or primordial) transverse momentum of partons in the inclusive production of particles at high energy and moderately large p_T has been known for a long time, beginning with Drell-Yan and diphoton processes, and continuing with photon and meson production in hadronic collisions. In view of its renewed interest in the context of polarized processes and single spin asymmetries we perform, in the framework of perturbative QCD with the inclusion of spin and transverse momentum effects, a detailed analysis of several such processes in different kinematical situations. We show that the inclusion of these effects leads, at the level of accuracy reachable in this approach, to an overall satisfactory agreement between theoretical predictions and experimental unpolarized data, thus giving support to the study of spin effects and single spin asymmetries within the same scheme. We present results for transverse single spin asymmetries, generated by the so-called Sivers effect, in inclusive pion and photon production in proton-proton collisions. We compare our results with the available experimental data and with previous results obtained using simplified versions of this approach. |
hep-ph/0101061 | Gregory W. Carter | G.W. Carter and E.V. Shuryak | Do Instantons and Strings Cluster when the Number of Colors is Large? | 10 pages, 1 figure, uses epsf.sty | Phys.Lett. B524 (2002) 297-302 | 10.1016/S0370-2693(01)01399-5 | null | hep-ph | null | We consider the $N_c\to\infty$ limit of QCD using a toy model in which
instantons exchange color-singlet scalar fields which do not self-interact. Our
main observation is that collective attraction leads the formation of large
clusters containing $O(N_c)$ nonperturbative objects. We further show that this
clustering of instantons is limited due to a non-trivial repulsion inherent in
the ADHM multi-instanton solution. As a result the vacuum is very different
from that at low $N_c$, notably being more inhomogeneous, in ways which will
affect chiral symmetry breaking of light quarks. We also briefly discuss a
similar phenomenon for color strings in baryons made of medium-mass
(charm-like) quarks.
| [
{
"created": "Mon, 8 Jan 2001 15:20:00 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Oct 2001 23:08:24 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Carter",
"G. W.",
""
],
[
"Shuryak",
"E. V.",
""
]
] | We consider the $N_c\to\infty$ limit of QCD using a toy model in which instantons exchange color-singlet scalar fields which do not self-interact. Our main observation is that collective attraction leads the formation of large clusters containing $O(N_c)$ nonperturbative objects. We further show that this clustering of instantons is limited due to a non-trivial repulsion inherent in the ADHM multi-instanton solution. As a result the vacuum is very different from that at low $N_c$, notably being more inhomogeneous, in ways which will affect chiral symmetry breaking of light quarks. We also briefly discuss a similar phenomenon for color strings in baryons made of medium-mass (charm-like) quarks. |
1203.1705 | Tom\'a\v{s} Brauner | Hiroaki Abuki and Tom\'a\v{s} Brauner | How does color neutrality affect collective modes in color
superconductors? | 14 pages, REVTeX 4.1, 1 eps figure | Phys.Rev.D85:116004,2012 | 10.1103/PhysRevD.85.116004 | BI-TP 2012/07 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the issue of color neutrality in effective model descriptions of
dense quark matter based on global color symmetry. While the equilibrium
thermodynamics of such models is now well understood, we examine the collective
modes, focusing on the fluctuations of the order parameter. We point out that
the constraint of color neutrality must be carefully generalized in order to
obtain physically consistent and well-defined results. Particularly important
is that the collective modes associated with order parameter fluctuations
couple to charge density fluctuations in the neutral medium. We start by
proving explicitly that, in contrast to claims made previously in literature,
Nambu-Goldstone bosons of spontaneously broken global color symmetry remain
exactly massless even after imposing the color neutrality constraint. As the
next step, we make the argument general by using effective field theory. We
then employ the high-density approximation to calculate the couplings in the
effective Lagrangian and thus the Nambu-Goldstone boson dispersion relations.
| [
{
"created": "Thu, 8 Mar 2012 08:21:04 GMT",
"version": "v1"
}
] | 2012-06-18 | [
[
"Abuki",
"Hiroaki",
""
],
[
"Brauner",
"Tomáš",
""
]
] | We revisit the issue of color neutrality in effective model descriptions of dense quark matter based on global color symmetry. While the equilibrium thermodynamics of such models is now well understood, we examine the collective modes, focusing on the fluctuations of the order parameter. We point out that the constraint of color neutrality must be carefully generalized in order to obtain physically consistent and well-defined results. Particularly important is that the collective modes associated with order parameter fluctuations couple to charge density fluctuations in the neutral medium. We start by proving explicitly that, in contrast to claims made previously in literature, Nambu-Goldstone bosons of spontaneously broken global color symmetry remain exactly massless even after imposing the color neutrality constraint. As the next step, we make the argument general by using effective field theory. We then employ the high-density approximation to calculate the couplings in the effective Lagrangian and thus the Nambu-Goldstone boson dispersion relations. |
hep-ph/0206062 | Thomas Schaefer | Thomas Schaefer (Duke U, SUNY Stony Brook, Riken-BNL) | Instantons in QCD with Many Colors | 40 pages, 16 figures, minor revisions, to appear in PRD | Phys.Rev. D66 (2002) 076009 | 10.1103/PhysRevD.66.076009 | null | hep-ph | null | We study instantons in QCD with many colors. We first discuss a number of
qualitative arguments concerning the large N_c scaling behavior of a random
instanton ensemble. We show that most hadronic observables are compatible with
standard large N_c counting rules provided the average instanton size is O(1)
and the instanton density is O(N_c) in the large N_c limit. This is not the
case for the topological susceptibility and the mass of the eta'. For these
observables consistency with conventional large N_c counting requires that
fluctuations in the instanton liquid are suppressed compared to Poissonian
fluctuations. Using mean field estimates and numerical simulations we show that
the required scaling behavior of the instanton density is natural in models in
which the instanton density is regularized in terms of a classical repulsive
core. We also show that in these models fluctuations of the topological charge
are suppressed and that m^2_eta'=O(1/N_c). We conclude that the instanton
liquid model is not necessarily in conflict with the 1/N_c expansion.
| [
{
"created": "Thu, 6 Jun 2002 06:54:40 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 2002 16:45:45 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Schaefer",
"Thomas",
"",
"Duke U, SUNY Stony Brook, Riken-BNL"
]
] | We study instantons in QCD with many colors. We first discuss a number of qualitative arguments concerning the large N_c scaling behavior of a random instanton ensemble. We show that most hadronic observables are compatible with standard large N_c counting rules provided the average instanton size is O(1) and the instanton density is O(N_c) in the large N_c limit. This is not the case for the topological susceptibility and the mass of the eta'. For these observables consistency with conventional large N_c counting requires that fluctuations in the instanton liquid are suppressed compared to Poissonian fluctuations. Using mean field estimates and numerical simulations we show that the required scaling behavior of the instanton density is natural in models in which the instanton density is regularized in terms of a classical repulsive core. We also show that in these models fluctuations of the topological charge are suppressed and that m^2_eta'=O(1/N_c). We conclude that the instanton liquid model is not necessarily in conflict with the 1/N_c expansion. |
hep-ph/0703218 | Dario Zappala | Paolo Castorina, Dario Zappala' | Inhomogeneous phase of a Gluon Plasma at finite temperature and density | 5 pages, 2 figures | Europhys.Lett.80:22001,2007 | 10.1209/0295-5075/80/22001 | null | hep-ph | null | By considering the non-perturbative effects associated with the fundamental
modular region, a new phase of a Gluon Plasma at finite density is proposed. It
corresponds to the transition from glueballs to non-perturbative gluons which
condense at a non vanishing momentum. In this respect the proposed phase is
analogous to the color superconducting LOFF phase for fermionic systems.
| [
{
"created": "Tue, 20 Mar 2007 15:28:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Castorina",
"Paolo",
""
],
[
"Zappala'",
"Dario",
""
]
] | By considering the non-perturbative effects associated with the fundamental modular region, a new phase of a Gluon Plasma at finite density is proposed. It corresponds to the transition from glueballs to non-perturbative gluons which condense at a non vanishing momentum. In this respect the proposed phase is analogous to the color superconducting LOFF phase for fermionic systems. |
1111.1424 | Ruben Concei\c{c}\~ao | S. Andringa, L. Cazon, R. Concei\c{c}\~ao, M. Pimenta | The muonic longitudinal shower profiles at production | null | null | 10.1016/j.astropartphys.2012.03.010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper the longitudinal profile of muon production along the shower
axis is studied. The characteristics of this distribution is investigated for
different primary masses, zenith angles, primary energies, and different high
energy hadronic models. It is found that the shape of this distribution
displays universal features similarly to what is known for the electromagnetic
profile. The relation between the muon production distribution and the
longitudinal electromagnetic evolution is also discussed.
| [
{
"created": "Sun, 6 Nov 2011 15:02:45 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2012 13:03:04 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Andringa",
"S.",
""
],
[
"Cazon",
"L.",
""
],
[
"Conceição",
"R.",
""
],
[
"Pimenta",
"M.",
""
]
] | In this paper the longitudinal profile of muon production along the shower axis is studied. The characteristics of this distribution is investigated for different primary masses, zenith angles, primary energies, and different high energy hadronic models. It is found that the shape of this distribution displays universal features similarly to what is known for the electromagnetic profile. The relation between the muon production distribution and the longitudinal electromagnetic evolution is also discussed. |
2004.05200 | Saul Ramos-Sanchez | Hans Peter Nilles, Saul Ramos-Sanchez, Patrick K.S. Vaudrevange | Lessons from eclectic flavor symmetries | 30 pages, 2 tables, 1 figure; v2: assumptions clarified, references
added and updated, matches version published in NPB | null | 10.1016/j.nuclphysb.2020.115098 | TUM-HEP 1256/20 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A top-down approach to the flavor problem motivated from string theory leads
to the concept of eclectic flavor groups that combine traditional and modular
flavor symmetries. To make contact with models constructed in the bottom-up
approach, we analyze a specific example based on the eclectic flavor group
Omega(1) (a nontrivial combination of the traditional flavor group Delta(54)
and the finite modular group T') in order to extract general lessons from the
eclectic scheme. We observe that this scheme is highly predictive since it
severely restricts the possible group representations and modular weights of
matter fields. Thereby, it controls the structure of the Kaehler potential and
the superpotential, which we discuss explicitly. In particular, both Kaehler
potential and superpotential are shown to transform nontrivially, but combine
to an invariant action. Finally, we find that discrete R-symmetries are
intrinsic to eclectic flavor groups.
| [
{
"created": "Fri, 10 Apr 2020 18:49:30 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jul 2020 12:11:27 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Nilles",
"Hans Peter",
""
],
[
"Ramos-Sanchez",
"Saul",
""
],
[
"Vaudrevange",
"Patrick K. S.",
""
]
] | A top-down approach to the flavor problem motivated from string theory leads to the concept of eclectic flavor groups that combine traditional and modular flavor symmetries. To make contact with models constructed in the bottom-up approach, we analyze a specific example based on the eclectic flavor group Omega(1) (a nontrivial combination of the traditional flavor group Delta(54) and the finite modular group T') in order to extract general lessons from the eclectic scheme. We observe that this scheme is highly predictive since it severely restricts the possible group representations and modular weights of matter fields. Thereby, it controls the structure of the Kaehler potential and the superpotential, which we discuss explicitly. In particular, both Kaehler potential and superpotential are shown to transform nontrivially, but combine to an invariant action. Finally, we find that discrete R-symmetries are intrinsic to eclectic flavor groups. |
hep-ph/0310030 | Joao Magueijo | Dagny Kimberly and Joao Magueijo | Varying Alpha and the Electroweak Model | null | Phys.Lett. B584 (2004) 8-15 | 10.1016/j.physletb.2004.01.050 | null | hep-ph astro-ph gr-qc | null | Inspired by recent claims for a varying fine structure constant, alpha, we
investigate the effect of ``promoting coupling constants to variables'' upon
various parameters of the standard model. We first consider a toy model:
Proca's theory of the massive photon. We then explore the electroweak theory
with one and two dilaton fields. We find that a varying alpha unavoidably
implies varying W and Z masses. This follows from gauge invariance, and is to
be contrasted with Proca' theory. For the two dilaton theory the Weinberg angle
is also variable, but Fermi's constant and the tree level fermion masses remain
constant unless the Higgs' potential becomes dynamical. We outline some
cosmological implications.
| [
{
"created": "Thu, 2 Oct 2003 13:51:15 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kimberly",
"Dagny",
""
],
[
"Magueijo",
"Joao",
""
]
] | Inspired by recent claims for a varying fine structure constant, alpha, we investigate the effect of ``promoting coupling constants to variables'' upon various parameters of the standard model. We first consider a toy model: Proca's theory of the massive photon. We then explore the electroweak theory with one and two dilaton fields. We find that a varying alpha unavoidably implies varying W and Z masses. This follows from gauge invariance, and is to be contrasted with Proca' theory. For the two dilaton theory the Weinberg angle is also variable, but Fermi's constant and the tree level fermion masses remain constant unless the Higgs' potential becomes dynamical. We outline some cosmological implications. |
hep-ph/0309249 | Werner Rodejohann | W. Rodejohann | A Parametrization for the Neutrino Mixing Matrix | 26 pages. Subsection about possible origin of deviations and some
references added. To appear in PRD | Phys.Rev.D69:033005,2004 | 10.1103/PhysRevD.69.033005 | SISSA 83/2003/EP | hep-ph hep-ex nucl-ex | null | We propose a flexible and model independent parametrization of the neutrino
mixing matrix, which takes advantage of the fact that there are up to three
small quantities in neutrino mixing phenomenology: (i) the deviation from
maximal mixing of solar neutrinos, (ii) the mixing matrix element U_{e3} and
(iii) the deviation from maximal mixing of atmospheric neutrinos. It is
possible to quantify those three observations with a parameter \lambda \sim
0.2, which appears at least linearly in all elements of the mixing matrix. The
limit \lambda -> 0 corresponds to exact bimaximal mixing. Present and future
experiments can be used to pin down the power of \lambda required to usefully
describe the observed phenomenology. Observing that the ratio of the two
measured mass squared differences is roughly \lambda^2 allows to further study
the structure of the Majorana mass matrix. We comment on the implications of
this parametrization for neutrinoless double beta decay and on the oscillation
probabilities in long-baseline experiments.
| [
{
"created": "Mon, 22 Sep 2003 14:24:01 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Dec 2003 14:34:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Rodejohann",
"W.",
""
]
] | We propose a flexible and model independent parametrization of the neutrino mixing matrix, which takes advantage of the fact that there are up to three small quantities in neutrino mixing phenomenology: (i) the deviation from maximal mixing of solar neutrinos, (ii) the mixing matrix element U_{e3} and (iii) the deviation from maximal mixing of atmospheric neutrinos. It is possible to quantify those three observations with a parameter \lambda \sim 0.2, which appears at least linearly in all elements of the mixing matrix. The limit \lambda -> 0 corresponds to exact bimaximal mixing. Present and future experiments can be used to pin down the power of \lambda required to usefully describe the observed phenomenology. Observing that the ratio of the two measured mass squared differences is roughly \lambda^2 allows to further study the structure of the Majorana mass matrix. We comment on the implications of this parametrization for neutrinoless double beta decay and on the oscillation probabilities in long-baseline experiments. |
1806.09112 | Ye-Ling Zhou | S. T. Petcov and Ye-Ling Zhou | On Neutrino Mixing in Matter and CP and T Violation Effects in Neutrino
Oscillations | 17 pages, 6 figures, refs added, published in PLB | Phys.Lett. B785 (2018) 95 | 10.1016/j.physletb.2018.08.025 | SISSA 23/2018/FISI, IPMU18--0112, IPPP/18/47 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Aspects of 3-neutrino mixing and oscillations in vacuum and in matter with
constant density are investigated working with a real form of the neutrino
Hamiltonian. We find the (approximate) equalities $\theta^m_{23} = \theta_{23}$
and $\delta^m = \delta$, $\theta_{23}$ ($\theta^m_{23}$) and $\delta$
($\delta^m$) being respectively the atmospheric neutrino mixing angle and the
Dirac CP violation phase in vacuum (in matter) of the neutrino mixing matrix,
which are shown to represent excellent approximations for the conditions of the
T2K (T2HK), T2HKK, NO$\nu$A and DUNE neutrino oscillation experiments. A new
derivation of the known relation $\sin2\theta^m_{23} \sin\delta^m =
\sin2\theta_{23} \sin\delta$ is presented and it is used to obtain a
correlation between the shifts of $\theta_{23}$ and $\delta$ due to the matter
effect. A derivation of the relation between the rephasing invariants which
determine the magnitude of CP and T violating effects in 3-flavour neutrino
oscillations in vacuum, $J_{\rm CP}$, and of the T violating effects in matter
with constant density, $J^{m}_{\rm T} \equiv J^{m}$, reported in
\cite{Krastev:1988yu} without a proof, is presented. It is shown that the
function $F$ which appears in this relation, $J^{m} = J_{\rm CP}\,F$, and whose
explicit form was given in \cite{Krastev:1988yu}, coincides with the function
$\tilde{F}$ in the similar relation $J^{m} = J_{\rm CP}\tilde{F}$ derived in
\cite{Naumov:1991ju}, although $F$ and $\tilde{F}$ are expressed in terms of
different sets of neutrino mass and mixing parameters and have completely
different forms.
| [
{
"created": "Sun, 24 Jun 2018 09:19:59 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2018 10:58:49 GMT",
"version": "v2"
}
] | 2018-09-17 | [
[
"Petcov",
"S. T.",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] | Aspects of 3-neutrino mixing and oscillations in vacuum and in matter with constant density are investigated working with a real form of the neutrino Hamiltonian. We find the (approximate) equalities $\theta^m_{23} = \theta_{23}$ and $\delta^m = \delta$, $\theta_{23}$ ($\theta^m_{23}$) and $\delta$ ($\delta^m$) being respectively the atmospheric neutrino mixing angle and the Dirac CP violation phase in vacuum (in matter) of the neutrino mixing matrix, which are shown to represent excellent approximations for the conditions of the T2K (T2HK), T2HKK, NO$\nu$A and DUNE neutrino oscillation experiments. A new derivation of the known relation $\sin2\theta^m_{23} \sin\delta^m = \sin2\theta_{23} \sin\delta$ is presented and it is used to obtain a correlation between the shifts of $\theta_{23}$ and $\delta$ due to the matter effect. A derivation of the relation between the rephasing invariants which determine the magnitude of CP and T violating effects in 3-flavour neutrino oscillations in vacuum, $J_{\rm CP}$, and of the T violating effects in matter with constant density, $J^{m}_{\rm T} \equiv J^{m}$, reported in \cite{Krastev:1988yu} without a proof, is presented. It is shown that the function $F$ which appears in this relation, $J^{m} = J_{\rm CP}\,F$, and whose explicit form was given in \cite{Krastev:1988yu}, coincides with the function $\tilde{F}$ in the similar relation $J^{m} = J_{\rm CP}\tilde{F}$ derived in \cite{Naumov:1991ju}, although $F$ and $\tilde{F}$ are expressed in terms of different sets of neutrino mass and mixing parameters and have completely different forms. |
0810.5082 | Christophe Royon | G. Beuf, C. Royon, D. Salek | Geometric Scaling of $F_2$ and $F_2^c$ in data and QCD Parametrisations | 11 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scaling properties at low $x$ of the proton DIS cross section and its
charm component are analyzed with the help of the quality factor method.
Scaling properties are tested both in the deep inelastic scattering data and in
the structure functions reconstructed from CTEQ, MRST and GRV parametrisations
of parton density functions. The results for DIS cross sections are fully
compatible between data and parametrisations. Even with larger error bars, the
charm component data favors the same geometric scaling properties as the ones
of inclusive DIS. This is not the case for all parametrisations of the charm
component.
| [
{
"created": "Tue, 28 Oct 2008 16:56:10 GMT",
"version": "v1"
}
] | 2008-10-29 | [
[
"Beuf",
"G.",
""
],
[
"Royon",
"C.",
""
],
[
"Salek",
"D.",
""
]
] | The scaling properties at low $x$ of the proton DIS cross section and its charm component are analyzed with the help of the quality factor method. Scaling properties are tested both in the deep inelastic scattering data and in the structure functions reconstructed from CTEQ, MRST and GRV parametrisations of parton density functions. The results for DIS cross sections are fully compatible between data and parametrisations. Even with larger error bars, the charm component data favors the same geometric scaling properties as the ones of inclusive DIS. This is not the case for all parametrisations of the charm component. |
2007.06269 | Vladimir Skalozub | V. Skalozub and M. Dmytriiev | On direct search for dark matter in scattering processes within Yukawa
model | 14 pages, 9 figures, 13 references | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | \begin{abstract} Nowadays, no dark matter candidates have been discovered. We
consider two possible reasons for that, both related to the approach of on-peak
resonance searching for. As is believed usually, a new particle suits the
conditions that the ratio of the width to the mass is less than $1-3 \%$ and a
narrow width approximation (NWA) is applicable to identify the such type
resonant peak in the invariant mass spectrum of collision products.
In the present paper, in the framework of generalized Yukawa model, we find
out the properties of the searched particle when its width is larger than a
maximal one expected during experiments and so this state could be missed as a
noise. We also ascertain the values of particle's parameters when the NWA is
not applicable and estimate the width value when it happens. These estimations
are relevant to interactions between the Standard model and dark matter
particles. Such approach is focused on the role of couplings and mass values
introduced in the model describing interaction of visible and dark matter.
Key words: dark matter; resonance; narrow width approximation; mixing of
fields.
| [
{
"created": "Mon, 13 Jul 2020 09:46:52 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2021 11:08:43 GMT",
"version": "v2"
}
] | 2021-10-14 | [
[
"Skalozub",
"V.",
""
],
[
"Dmytriiev",
"M.",
""
]
] | \begin{abstract} Nowadays, no dark matter candidates have been discovered. We consider two possible reasons for that, both related to the approach of on-peak resonance searching for. As is believed usually, a new particle suits the conditions that the ratio of the width to the mass is less than $1-3 \%$ and a narrow width approximation (NWA) is applicable to identify the such type resonant peak in the invariant mass spectrum of collision products. In the present paper, in the framework of generalized Yukawa model, we find out the properties of the searched particle when its width is larger than a maximal one expected during experiments and so this state could be missed as a noise. We also ascertain the values of particle's parameters when the NWA is not applicable and estimate the width value when it happens. These estimations are relevant to interactions between the Standard model and dark matter particles. Such approach is focused on the role of couplings and mass values introduced in the model describing interaction of visible and dark matter. Key words: dark matter; resonance; narrow width approximation; mixing of fields. |
2202.10315 | Giorgio Galanti | Giorgio Galanti | Photon-ALP interaction as a measure of initial photon polarization | 9 pages, 3 figures. This version matches the published paper: Phys.
Rev. D 105, 083022 (2022) | Phys. Rev. D 105, 083022 (2022) | 10.1103/PhysRevD.105.083022 | null | hep-ph astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion-like particles (ALPs) are very light, neutral, spin zero bosons
predicted by superstring theory. ALPs interact primarily with two photons and
in the presence of an external magnetic field they generate photon-ALP
oscillations and the change of the polarization state of photons. While well
motivated from a theoretical point of view, hints on ALP existence come from
astrophysics. In this paper, we state and demonstrate some theorems about a
strict relationship between initial photon polarization and photon-ALP
conversion probability - which can be extrapolated by observed astrophysical
spectra - so that, in the presence of ALPs, flux-measuring observatories become
also porarimeters.
| [
{
"created": "Mon, 21 Feb 2022 15:40:03 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2022 16:08:16 GMT",
"version": "v2"
}
] | 2022-04-29 | [
[
"Galanti",
"Giorgio",
""
]
] | Axion-like particles (ALPs) are very light, neutral, spin zero bosons predicted by superstring theory. ALPs interact primarily with two photons and in the presence of an external magnetic field they generate photon-ALP oscillations and the change of the polarization state of photons. While well motivated from a theoretical point of view, hints on ALP existence come from astrophysics. In this paper, we state and demonstrate some theorems about a strict relationship between initial photon polarization and photon-ALP conversion probability - which can be extrapolated by observed astrophysical spectra - so that, in the presence of ALPs, flux-measuring observatories become also porarimeters. |
0710.0680 | T. Becher | Thomas Becher, Matthias Neubert and Gang Xu | Dynamical Threshold Enhancement and Resummation in Drell-Yan Production | 43 pages; references added; small numerical changes at NNLO due to
improved fixed-order code | JHEP 0807:030,2008 | 10.1088/1126-6708/2008/07/030 | CLNS 07/2009, FERMILAB-PUB-07-507-T, MZ-TH/07-16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Partonic cross sections for the production of massive objects in hadronic
collisions receive large corrections when the invariant mass of the
initial-state partons is just above the production threshold. Since typically
the center-of-mass energy of the hadronic collision is much higher than the
mass of the heavy objects, it is not obvious that these contributions translate
into large corrections to the hadronic cross section. Using a recent approach
to threshold resummation based on effective field theory, we quantify to which
extent the fall-off of the parton densities at high x leads to a dynamical
enhancement of the partonic threshold region. With the example of Drell-Yan
production, we study the emergence of an effective physical scale
characterizing the soft emissions in the process. We derive compact analytical
expressions for the resummed Drell-Yan cross section and rapidity distribution
directly in momentum space. They are free of Landau-pole singularities and are
trivially matched onto fixed-order perturbative calculations. Evaluating the
resummed cross sections at NNNLL order and matching onto NNLO fixed-order
calculations, we perform a detailed numerical analysis of the cross section and
rapidity distribution in proton-proton collisions.
| [
{
"created": "Wed, 3 Oct 2007 00:17:13 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jun 2008 02:30:33 GMT",
"version": "v2"
}
] | 2009-04-17 | [
[
"Becher",
"Thomas",
""
],
[
"Neubert",
"Matthias",
""
],
[
"Xu",
"Gang",
""
]
] | Partonic cross sections for the production of massive objects in hadronic collisions receive large corrections when the invariant mass of the initial-state partons is just above the production threshold. Since typically the center-of-mass energy of the hadronic collision is much higher than the mass of the heavy objects, it is not obvious that these contributions translate into large corrections to the hadronic cross section. Using a recent approach to threshold resummation based on effective field theory, we quantify to which extent the fall-off of the parton densities at high x leads to a dynamical enhancement of the partonic threshold region. With the example of Drell-Yan production, we study the emergence of an effective physical scale characterizing the soft emissions in the process. We derive compact analytical expressions for the resummed Drell-Yan cross section and rapidity distribution directly in momentum space. They are free of Landau-pole singularities and are trivially matched onto fixed-order perturbative calculations. Evaluating the resummed cross sections at NNNLL order and matching onto NNLO fixed-order calculations, we perform a detailed numerical analysis of the cross section and rapidity distribution in proton-proton collisions. |
1609.09612 | Paolo Cea | Paolo Cea | On the new LHC resonance | 27 pages, 7 figures, final version | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an alternative interpretation within the Standard Model of the new
LHC resonance at $125 \; GeV$. We further elaborate on our previous proposal
that the resonance at 125 GeV could be interpreted as a pseudoscalar meson with
quantum number $J^{PC} = 0^{- +}$. We develop a phenomenological approach where
this pseudoscalar mimics the decays of the Standard Model Higgs boson in the
vector boson decay channels. We propose that the true Higgs boson should be a
heavy resonance with mass of $750 \, GeV$ as argued in Ref.~\cite{Cea:2012}. We
determine the most relevant decay modes and estimate the partial decay widths
and branching ratios. We also discuss briefly the experimental signatures of
this heavy Higgs boson. Finally, we attempt a comparison of our theoretical
expectations with recent data at $\sqrt{s} =13 \,TeV$ from ATLAS and CMS
experiments in the so-called golden channel. We find that the available
experimental data could be consistent with the heavy Higgs scenario.
| [
{
"created": "Fri, 30 Sep 2016 06:34:14 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2017 14:09:14 GMT",
"version": "v2"
}
] | 2017-03-14 | [
[
"Cea",
"Paolo",
""
]
] | We present an alternative interpretation within the Standard Model of the new LHC resonance at $125 \; GeV$. We further elaborate on our previous proposal that the resonance at 125 GeV could be interpreted as a pseudoscalar meson with quantum number $J^{PC} = 0^{- +}$. We develop a phenomenological approach where this pseudoscalar mimics the decays of the Standard Model Higgs boson in the vector boson decay channels. We propose that the true Higgs boson should be a heavy resonance with mass of $750 \, GeV$ as argued in Ref.~\cite{Cea:2012}. We determine the most relevant decay modes and estimate the partial decay widths and branching ratios. We also discuss briefly the experimental signatures of this heavy Higgs boson. Finally, we attempt a comparison of our theoretical expectations with recent data at $\sqrt{s} =13 \,TeV$ from ATLAS and CMS experiments in the so-called golden channel. We find that the available experimental data could be consistent with the heavy Higgs scenario. |
1411.4612 | Hendrik van Hees | Ralf Rapp and Hendrik van Hees | Thermal Dileptons as Fireball Thermometer and Chronometer | 4 pages 3 figures | Phys.Lett. B 753, 586 (2016) | 10.1016/j.physletb.2015.12.065 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal dilepton radiation from the hot fireballs created in high-energy
heavy-ion collisions provides unique insights into the properties of the
produced medium. We first show how the predictions of hadronic many-body theory
for a melting $\rho$ meson, coupled with QGP emission utilizing a modern
lattice-QCD based equation of state, yield a quantitative description of
dilepton spectra in heavy-ion collisions at the SPS and the RHIC beam energy
scan program. We utilize these results to systematically extract the excess
yields and their invariant-mass spectral slopes to predict the excitation
function of fireball lifetimes and (early) temperatures, respectively. We
thereby demonstrate that future measurements of these quantities can yield
unprecedented information on basic fireball properties. Specifically, our
predictions quantify the relation between the measured and maximal fireball
temperatures, and the proportionality of excess yields and total lifetime. This
information can serve as a "caloric" curve to search for a first-order QCD
phase transition, and to detect non-monotonous lifetime variations possibly
related to critical phenomena.
| [
{
"created": "Mon, 17 Nov 2014 20:01:43 GMT",
"version": "v1"
}
] | 2016-02-24 | [
[
"Rapp",
"Ralf",
""
],
[
"van Hees",
"Hendrik",
""
]
] | Thermal dilepton radiation from the hot fireballs created in high-energy heavy-ion collisions provides unique insights into the properties of the produced medium. We first show how the predictions of hadronic many-body theory for a melting $\rho$ meson, coupled with QGP emission utilizing a modern lattice-QCD based equation of state, yield a quantitative description of dilepton spectra in heavy-ion collisions at the SPS and the RHIC beam energy scan program. We utilize these results to systematically extract the excess yields and their invariant-mass spectral slopes to predict the excitation function of fireball lifetimes and (early) temperatures, respectively. We thereby demonstrate that future measurements of these quantities can yield unprecedented information on basic fireball properties. Specifically, our predictions quantify the relation between the measured and maximal fireball temperatures, and the proportionality of excess yields and total lifetime. This information can serve as a "caloric" curve to search for a first-order QCD phase transition, and to detect non-monotonous lifetime variations possibly related to critical phenomena. |
2405.07025 | Min He | Shouxing Zhao and Min He | Second-Order Dissociation and Transition of Heavy Quarkonia in the
Quark-Gluon Plasma | 17 pages, 13 figures | null | null | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We revisit the dissociation of heavy quarkonia by thermal partons at the
next-to-leading order (NLO, also known as inelastic parton scattering
dissociation) in the Quark-Gluon Plasma (QGP). Utilizing the chromo-electric
dipole coupling from QCD multipole expansion as an effective Hamiltonian, this
has been conducted in the approach of second-order quantum mechanical
perturbation theory, which allows us to systematically incorporate the bound
state wave functions. Employing the quarkonium wave functions and binding
energies obtained from an in-medium potential model, we then numerically
evaluate the dissociation cross sections and rates for various charmonia and
bottomonia, where the infrared and collinear divergences are regularized by the
thermal masses of medium partons. We demonstrate that distinct from the leading
order (LO, also known as gluo-dissociation) counterparts peaking at relatively
low gluon energy and falling off thereafter, the NLO cross sections first grow
and then nearly saturate as the incident parton energy increases, as a result
of the outgoing parton carrying away the excess energy. The resulting NLO
dissociation rates increase with temperature and take over from the LO
counterparts toward high temperatures, similar to pertinent findings from
previous studies. We also evaluate the in-medium second-order transition
between different bound states, which may contribute to the total thermal decay
widths of heavy quarkonia in the QGP.
| [
{
"created": "Sat, 11 May 2024 14:51:47 GMT",
"version": "v1"
}
] | 2024-05-14 | [
[
"Zhao",
"Shouxing",
""
],
[
"He",
"Min",
""
]
] | We revisit the dissociation of heavy quarkonia by thermal partons at the next-to-leading order (NLO, also known as inelastic parton scattering dissociation) in the Quark-Gluon Plasma (QGP). Utilizing the chromo-electric dipole coupling from QCD multipole expansion as an effective Hamiltonian, this has been conducted in the approach of second-order quantum mechanical perturbation theory, which allows us to systematically incorporate the bound state wave functions. Employing the quarkonium wave functions and binding energies obtained from an in-medium potential model, we then numerically evaluate the dissociation cross sections and rates for various charmonia and bottomonia, where the infrared and collinear divergences are regularized by the thermal masses of medium partons. We demonstrate that distinct from the leading order (LO, also known as gluo-dissociation) counterparts peaking at relatively low gluon energy and falling off thereafter, the NLO cross sections first grow and then nearly saturate as the incident parton energy increases, as a result of the outgoing parton carrying away the excess energy. The resulting NLO dissociation rates increase with temperature and take over from the LO counterparts toward high temperatures, similar to pertinent findings from previous studies. We also evaluate the in-medium second-order transition between different bound states, which may contribute to the total thermal decay widths of heavy quarkonia in the QGP. |
hep-ph/0204323 | Zuo-tang Liang | Zuo-tang Liang (Shandong U.) and Chun-xiu Liu (Shandong U. & IHEP
Bejing) | Hyperon polarization in \nu_\mu charged current interaction at the NOMAD
energies | 11 pages, 3 figures | Phys. Rev. D66, 057302 (2002) | 10.1103/PhysRevD.66.057302 | null | hep-ph | null | We show that, in $\nu_\mu N\to \mu^-\Lambda X$ at the NOMAD energies, it is
impossible to separate the products of the fragmentation of the struck quark
from those of the nucleon remnant. The latter has a large contribution even in
the current fragmentation region and has to be taken into account in
calculating $\Lambda$ polarization using different pictures. Based on this, we
make a rough estimation for the longitudinal $\Lambda$ polarization in
$\nu_{\mu} N \to \mu^- \Lambda X$ at the NOMAD energies. A comparison with the
data is given and predictions for $\nu_\mu N\to\mu^-\Sigma^+X$ are presented.
| [
{
"created": "Sun, 28 Apr 2002 08:17:02 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 2002 19:35:25 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Liang",
"Zuo-tang",
"",
"Shandong U."
],
[
"Liu",
"Chun-xiu",
"",
"Shandong U. & IHEP\n Bejing"
]
] | We show that, in $\nu_\mu N\to \mu^-\Lambda X$ at the NOMAD energies, it is impossible to separate the products of the fragmentation of the struck quark from those of the nucleon remnant. The latter has a large contribution even in the current fragmentation region and has to be taken into account in calculating $\Lambda$ polarization using different pictures. Based on this, we make a rough estimation for the longitudinal $\Lambda$ polarization in $\nu_{\mu} N \to \mu^- \Lambda X$ at the NOMAD energies. A comparison with the data is given and predictions for $\nu_\mu N\to\mu^-\Sigma^+X$ are presented. |
1412.5174 | Felix Kahlhoefer | Matthew J. Dolan, Felix Kahlhoefer, Christopher McCabe, Kai
Schmidt-Hoberg | A taste of dark matter: Flavour constraints on pseudoscalar mediators | 35 pages + appendices, 12 figures; v2: minor changes, references
added, matches published version; v3: equation (2.8) corrected, discussion
updated, conclusions unchanged | JHEP 1503 (2015) 171 | 10.1007/JHEP03(2015)171 | DESY 14-238, SLAC-PUB-16179 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter interacting via the exchange of a light pseudoscalar can induce
observable signals in indirect detection experiments and experience large
self-interactions while evading the strong bounds from direct dark matter
searches. The pseudoscalar mediator will however induce flavour-changing
interactions in the Standard Model, providing a promising alternative way to
test these models. We investigate in detail the constraints arising from rare
meson decays and fixed target experiments for different coupling structures
between the pseudoscalar and Standard Model fermions. The resulting bounds are
highly complementary to the information inferred from the dark matter relic
density and the constraints from primordial nucleosynthesis. We discuss the
implications of our findings for the dark matter self-interaction cross section
and the prospects of probing dark matter coupled to a light pseudoscalar with
direct or indirect detection experiments. In particular, we find that a
pseudoscalar mediator can only explain the Galactic Centre excess if its mass
is above that of the B mesons, and that it is impossible to obtain a
sufficiently large direct detection cross section to account for the DAMA
modulation
| [
{
"created": "Tue, 16 Dec 2014 21:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 2015 21:51:45 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jul 2015 13:27:05 GMT",
"version": "v3"
}
] | 2015-07-06 | [
[
"Dolan",
"Matthew J.",
""
],
[
"Kahlhoefer",
"Felix",
""
],
[
"McCabe",
"Christopher",
""
],
[
"Schmidt-Hoberg",
"Kai",
""
]
] | Dark matter interacting via the exchange of a light pseudoscalar can induce observable signals in indirect detection experiments and experience large self-interactions while evading the strong bounds from direct dark matter searches. The pseudoscalar mediator will however induce flavour-changing interactions in the Standard Model, providing a promising alternative way to test these models. We investigate in detail the constraints arising from rare meson decays and fixed target experiments for different coupling structures between the pseudoscalar and Standard Model fermions. The resulting bounds are highly complementary to the information inferred from the dark matter relic density and the constraints from primordial nucleosynthesis. We discuss the implications of our findings for the dark matter self-interaction cross section and the prospects of probing dark matter coupled to a light pseudoscalar with direct or indirect detection experiments. In particular, we find that a pseudoscalar mediator can only explain the Galactic Centre excess if its mass is above that of the B mesons, and that it is impossible to obtain a sufficiently large direct detection cross section to account for the DAMA modulation |
hep-ph/9208233 | Ajit Srivastava | M.J. Bowick, L. Chandar, E.A. Schiff, and A.M. Srivastava | The Cosmological Kibble Mechanism in the Laboratory: String Formation in
Liquid Crystals | 17 pages, in TEX, 2 figures (not included, available on request) | Science 263:943-945,1994 | 10.1126/science.263.5149.943 | SU-HEP-4241-512, TPI-MINN-92/35-T | hep-ph cond-mat hep-th | null | We have observed the production of strings (disclination lines and loops) via
the Kibble mechanism of domain (bubble) formation in the isotropic to nematic
phase transition of a sample of uniaxial nematic liquid crystal. The probablity
of string formation per bubble is measured to be $0.33 \pm 0.01$. This is in
good agreement with the theoretical value $1/ \pi$ expected in two dimensions
for the order parameter space $S^2/{\bf Z}_2$ of a simple uniaxial nematic
liquid crystal.
| [
{
"created": "Wed, 19 Aug 1992 15:17:02 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Bowick",
"M. J.",
""
],
[
"Chandar",
"L.",
""
],
[
"Schiff",
"E. A.",
""
],
[
"Srivastava",
"A. M.",
""
]
] | We have observed the production of strings (disclination lines and loops) via the Kibble mechanism of domain (bubble) formation in the isotropic to nematic phase transition of a sample of uniaxial nematic liquid crystal. The probablity of string formation per bubble is measured to be $0.33 \pm 0.01$. This is in good agreement with the theoretical value $1/ \pi$ expected in two dimensions for the order parameter space $S^2/{\bf Z}_2$ of a simple uniaxial nematic liquid crystal. |
1612.04086 | Margarete Muhlleitner | P. Basler, M. Krause, M. Muhlleitner, J. Wittbrodt, A. Wlotzka | Strong First Order Electroweak Phase Transition in the CP-Conserving
2HDM Revisited | 34 pages, 12 figures, 3 tables. Matches journal version accepted for
publication | null | 10.1007/JHEP02(2017)121 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of the Higgs boson by the LHC experiments ATLAS and CMS has
marked a milestone for particle physics. Yet, there are still many open
questions that cannot be answered within the Standard Model (SM). For example,
the generation of the observed matter-antimatter asymmetry in the universe
through baryogenesis can only be explained qualitatively in the SM. A simple
extension of the SM compatible with the current theoretical and experimental
constraints is given by the 2-Higgs-Doublet Model (2HDM) where a second Higgs
doublet is added to the Higgs sector. We investigate the possibility of a
strong first order electroweak phase transition in the CP-conserving 2HDM type
I and type II where either of the CP-even Higgs bosons is identified with the
SM-like Higgs boson. The renormalisation that we apply on the loop-corrected
Higgs potential allows us to efficiently scan the 2HDM parameter space and
simultaneously take into account all relevant theoretical and up-to-date
experimental constraints. The 2HDM parameter regions found to be compatible
with the applied constraints and a strong electroweak phase transition are
analysed systematically. Our results show that there is a strong interplay
between the requirement of a strong phase transition and collider phenomenology
with testable implications for searches at the LHC.
| [
{
"created": "Tue, 13 Dec 2016 10:23:03 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Mar 2017 05:09:38 GMT",
"version": "v2"
}
] | 2017-03-28 | [
[
"Basler",
"P.",
""
],
[
"Krause",
"M.",
""
],
[
"Muhlleitner",
"M.",
""
],
[
"Wittbrodt",
"J.",
""
],
[
"Wlotzka",
"A.",
""
]
] | The discovery of the Higgs boson by the LHC experiments ATLAS and CMS has marked a milestone for particle physics. Yet, there are still many open questions that cannot be answered within the Standard Model (SM). For example, the generation of the observed matter-antimatter asymmetry in the universe through baryogenesis can only be explained qualitatively in the SM. A simple extension of the SM compatible with the current theoretical and experimental constraints is given by the 2-Higgs-Doublet Model (2HDM) where a second Higgs doublet is added to the Higgs sector. We investigate the possibility of a strong first order electroweak phase transition in the CP-conserving 2HDM type I and type II where either of the CP-even Higgs bosons is identified with the SM-like Higgs boson. The renormalisation that we apply on the loop-corrected Higgs potential allows us to efficiently scan the 2HDM parameter space and simultaneously take into account all relevant theoretical and up-to-date experimental constraints. The 2HDM parameter regions found to be compatible with the applied constraints and a strong electroweak phase transition are analysed systematically. Our results show that there is a strong interplay between the requirement of a strong phase transition and collider phenomenology with testable implications for searches at the LHC. |
hep-ph/0703050 | Robert Shrock | Robert Shrock | Some Recent Results on Models of Dynamical Electroweak Symmetry Breaking | 15 pages 3 figures, review talk given at SCGT06, International
Workshop on Strongly Coupled Gauge Theories, Nagoya, Nov. 2006, to appear in
the Proceedings of SCGT06, eds. M. Tanabashi, M. Harada, and K. Yamawaki | null | 10.1142/9789812790750_0023 | YITP-SB-07-06 | hep-ph | null | We review some recent results on models of dynamical electroweak symmetry
breaking involving extended technicolor.
| [
{
"created": "Mon, 5 Mar 2007 14:20:26 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Shrock",
"Robert",
""
]
] | We review some recent results on models of dynamical electroweak symmetry breaking involving extended technicolor. |
1305.3768 | Ruben Sandapen | Jeff Forshaw and Ruben Sandapen | Diffractive vector meson production at HERA using holographic AdS/QCD
wavefunctions | Proceedings Contribution to the XXI International Workshop on
Deep-Inelastic Scattering and Related Subjects, 22-26 April, 2013,
Marseilles, France. 5 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate another success of the AdS/QCD correspondence by showing that
an AdS/QCD holographic light-front wavefunction for the $\rho$ meson generates
predictions for the cross-sections of diffractive $\rho$ production that are in
agreement with data collected at the HERA electron-proton collider.
| [
{
"created": "Thu, 16 May 2013 11:53:09 GMT",
"version": "v1"
}
] | 2013-05-17 | [
[
"Forshaw",
"Jeff",
""
],
[
"Sandapen",
"Ruben",
""
]
] | We demonstrate another success of the AdS/QCD correspondence by showing that an AdS/QCD holographic light-front wavefunction for the $\rho$ meson generates predictions for the cross-sections of diffractive $\rho$ production that are in agreement with data collected at the HERA electron-proton collider. |
hep-ph/9708376 | Hajime Aoki | H. Aoki | Baryogenesis at the Electroweak Scale and Above | 35 pages, Latex, uses epsf, 5 figures. To be published in the
proceedings of 5th KEK Meeting on CP Violation and Its Origin, Tsukuba,
Japan, 6-7 Mar 1997. References added | null | null | KEK-TH-534 | hep-ph | null | We consider origins of the baryon asymmetry which we observe today. We review
the progress of electroweak-scale baryogenesis, and show a new mechanism,
string-scale baryogenesis.
| [
{
"created": "Sat, 16 Aug 1997 19:33:43 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 1997 11:25:42 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Aoki",
"H.",
""
]
] | We consider origins of the baryon asymmetry which we observe today. We review the progress of electroweak-scale baryogenesis, and show a new mechanism, string-scale baryogenesis. |
2106.04585 | Aleksas Mazeliauskas | Claude Duhr, Alexander Huss, Aleksas Mazeliauskas, Robert Szafron | An analysis of Bayesian estimates for missing higher orders in
perturbative calculations | 63 pages, 27 figures, for MiHO code see
https://github.com/aykhuss/miho v2: updated references, other small changes,
published version | JHEP 09 (2021) 122 | 10.1007/JHEP09(2021)122 | CERN-TH-2021-058 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | With current high precision collider data, the reliable estimation of
theoretical uncertainties due to missing higher orders (MHOs) in perturbation
theory has become a pressing issue for collider phenomenology. Traditionally,
the size of the MHOs is estimated through scale variation, a simple but ad hoc
method without probabilistic interpretation. Bayesian approaches provide a
compelling alternative to estimate the size of the MHOs, but it is not clear
how to interpret the perturbative scales, like the factorisation and
renormalisation scales, in a Bayesian framework. Recently, it was proposed that
the scales can be incorporated as hidden parameters into a Bayesian model. In
this paper, we thoroughly scrutinise Bayesian approaches to MHO estimation and
systematically study the performance of different models on an extensive set of
high-order calculations. We extend the framework in two significant ways.
First, we define a new model that allows for asymmetric probability
distributions. Second, we introduce a prescription to incorporate information
on perturbative scales without interpreting them as hidden model parameters. We
clarify how the two scale prescriptions bias the result towards specific scale
choice, and we discuss and compare different Bayesian MHO estimates among
themselves and to the traditional scale variation approach. Finally, we provide
a practical prescription of how existing perturbative results at the standard
scale variation points can be converted to 68%/95% credibility intervals in the
Bayesian approach using the new public code MiHO.
| [
{
"created": "Tue, 8 Jun 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2021 06:58:38 GMT",
"version": "v2"
}
] | 2021-09-30 | [
[
"Duhr",
"Claude",
""
],
[
"Huss",
"Alexander",
""
],
[
"Mazeliauskas",
"Aleksas",
""
],
[
"Szafron",
"Robert",
""
]
] | With current high precision collider data, the reliable estimation of theoretical uncertainties due to missing higher orders (MHOs) in perturbation theory has become a pressing issue for collider phenomenology. Traditionally, the size of the MHOs is estimated through scale variation, a simple but ad hoc method without probabilistic interpretation. Bayesian approaches provide a compelling alternative to estimate the size of the MHOs, but it is not clear how to interpret the perturbative scales, like the factorisation and renormalisation scales, in a Bayesian framework. Recently, it was proposed that the scales can be incorporated as hidden parameters into a Bayesian model. In this paper, we thoroughly scrutinise Bayesian approaches to MHO estimation and systematically study the performance of different models on an extensive set of high-order calculations. We extend the framework in two significant ways. First, we define a new model that allows for asymmetric probability distributions. Second, we introduce a prescription to incorporate information on perturbative scales without interpreting them as hidden model parameters. We clarify how the two scale prescriptions bias the result towards specific scale choice, and we discuss and compare different Bayesian MHO estimates among themselves and to the traditional scale variation approach. Finally, we provide a practical prescription of how existing perturbative results at the standard scale variation points can be converted to 68%/95% credibility intervals in the Bayesian approach using the new public code MiHO. |
1911.07286 | Paul Hoyer | Paul Hoyer | Bound states and perturbation theory | 4 pages. Talk at Light Cone 2019, 16-20 September 2019, Ecole
Polytechnique, Palaiseau, France | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A perturbative expansion for QED and QCD bound states is formulated in
$A^0=0$ gauge. The constituents of each Fock state are bound by their
instantaneous interaction. In QCD an O($\alpha_s^0$) confining potential arises
from a homogeneous solution of Gauss' constraint. The potential is uniquely
determined by the QCD action, up to a universal scale. The Cornell potential is
reproduced for quarkonia, and corresponding ones found for higher Fock states,
baryons and glueballs.
| [
{
"created": "Sun, 17 Nov 2019 17:10:13 GMT",
"version": "v1"
}
] | 2019-11-19 | [
[
"Hoyer",
"Paul",
""
]
] | A perturbative expansion for QED and QCD bound states is formulated in $A^0=0$ gauge. The constituents of each Fock state are bound by their instantaneous interaction. In QCD an O($\alpha_s^0$) confining potential arises from a homogeneous solution of Gauss' constraint. The potential is uniquely determined by the QCD action, up to a universal scale. The Cornell potential is reproduced for quarkonia, and corresponding ones found for higher Fock states, baryons and glueballs. |
0901.3545 | Hyun Min Lee | Ki-Young Choi and Hyun Min Lee | U(1)_R-mediated supersymmetry breaking from a six-dimensional flux
compactification | 33 pages, 9 figures, published version in JHEP | JHEP 0903:132,2009 | 10.1088/1126-6708/2009/03/132 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the U(1)_R-mediated supersymmetry breaking in a flux
compactification of 6D chiral gauged supergravity with codimension-two branes.
We consider a concrete model with manifest U(1)_R invariance for moduli
stabilization and visible sector in the context of 4D effective supergravity
with gauged U(1)_R and determine soft scalar masses in the visible sector
mainly by a nonzero U(1)_R D-term. We obtain a low energy superparticle
spectrum and discuss on the implications of the obtained non-universal scalar
soft masses on the SUSY phenomenology such as dark matter relic abundances.
| [
{
"created": "Thu, 22 Jan 2009 19:56:32 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 2009 14:07:35 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Choi",
"Ki-Young",
""
],
[
"Lee",
"Hyun Min",
""
]
] | We study the U(1)_R-mediated supersymmetry breaking in a flux compactification of 6D chiral gauged supergravity with codimension-two branes. We consider a concrete model with manifest U(1)_R invariance for moduli stabilization and visible sector in the context of 4D effective supergravity with gauged U(1)_R and determine soft scalar masses in the visible sector mainly by a nonzero U(1)_R D-term. We obtain a low energy superparticle spectrum and discuss on the implications of the obtained non-universal scalar soft masses on the SUSY phenomenology such as dark matter relic abundances. |
1307.0965 | Pouya Bakhti | Pouya Bakhti, Yasaman Farzan | Measuring Dirac CP-violating phase with intermediate energy beta beam
facility | 14 pages, 7 figures | null | 10.1140/epjc/s10052-014-2777-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Taking the established nonzero value of $\theta_{13}$, we study the
possibility of extracting the Dirac CP-violating phase by a beta beam facility
with a boost factor $100<\gamma<450$. We compare the performance of different
setups with different baselines, boost factors and detector technologies. We
find that an antineutrino beam from $^6$He decay with a baseline of $L=1300$ km
has a very promising CP discovery potential using a 500 kton Water Cherenkov
(WC) detector. Fortunately this baseline corresponds to the distance between
FermiLAB to Sanford underground research facility in South Dakota.
| [
{
"created": "Wed, 3 Jul 2013 10:54:05 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2013 05:40:23 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Bakhti",
"Pouya",
""
],
[
"Farzan",
"Yasaman",
""
]
] | Taking the established nonzero value of $\theta_{13}$, we study the possibility of extracting the Dirac CP-violating phase by a beta beam facility with a boost factor $100<\gamma<450$. We compare the performance of different setups with different baselines, boost factors and detector technologies. We find that an antineutrino beam from $^6$He decay with a baseline of $L=1300$ km has a very promising CP discovery potential using a 500 kton Water Cherenkov (WC) detector. Fortunately this baseline corresponds to the distance between FermiLAB to Sanford underground research facility in South Dakota. |
hep-ph/9905284 | Mustafa Savci | T. M. Aliev, M. Savci (Middle East Technical University, Ankara,
Turkey) | The "radiative Delta -> N gamma" decay in light cone QCD | 9 pages, 1figures, LaTeX formatted | Phys.Rev. D60 (1999) 114031 | 10.1103/PhysRevD.60.114031 | metu-phys-hep-99-25 | hep-ph | null | The "g_{Delta N gamma}" coupling for the "Delta -> N gamma" decay is
calculated in framework of the light cone QCD sum rules and is found to be
g_{Delta N gamma} = (1.6 pm 0.2) GeV^(-1). Using this value of g_{Delta N
gamma} we estimate the branching ratio of the Delta^+ -> N gamma decay, which
is in a very good agreement with the experimental result.
| [
{
"created": "Mon, 10 May 1999 12:09:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Aliev",
"T. M.",
"",
"Middle East Technical University, Ankara,\n Turkey"
],
[
"Savci",
"M.",
"",
"Middle East Technical University, Ankara,\n Turkey"
]
] | The "g_{Delta N gamma}" coupling for the "Delta -> N gamma" decay is calculated in framework of the light cone QCD sum rules and is found to be g_{Delta N gamma} = (1.6 pm 0.2) GeV^(-1). Using this value of g_{Delta N gamma} we estimate the branching ratio of the Delta^+ -> N gamma decay, which is in a very good agreement with the experimental result. |
1008.4555 | Doug McKay | Martin M. Block, Phuoc Ha and Douglas W. McKay | Ultrahigh energy neutrino scattering: an update | 8 pages, 1 figure, 3 tables | Phys.Rev.D82:077302,2010 | 10.1103/PhysRevD.82.077302 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update our estimates of charged and neutral current neutrino total cross
sections on isoscalar nucleons at ultrahigh energies using a global (x, Q^2)
fit, motivated by the Froissart bound, to the F_2 (electron-proton) structure
function utilizing the most recent analysis of the complete ZEUS and H1 data
sets from HERA I. Using the large Q^2, small Bjorken-x limits of the "wee"
parton model, we connect the ultrahigh energy neutrino cross sections directly
to the large Q^2, small-x extrapolation of our new fit, which we assume
saturates the Froissart bound. We compare both to our previous work, which
utilized only the smaller ZEUS data set, as well as to recent results of a
calculation using the ZEUS-S based global perturbative QCD parton distributions
using the combined HERA I results as input. Our new results substantiate our
previous conclusions, again predicting significantly smaller cross sections
than those predicted by extrapolating pQCD calculations to neutrino energies
above 10^9 GeV.
| [
{
"created": "Thu, 26 Aug 2010 17:51:57 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Block",
"Martin M.",
""
],
[
"Ha",
"Phuoc",
""
],
[
"McKay",
"Douglas W.",
""
]
] | We update our estimates of charged and neutral current neutrino total cross sections on isoscalar nucleons at ultrahigh energies using a global (x, Q^2) fit, motivated by the Froissart bound, to the F_2 (electron-proton) structure function utilizing the most recent analysis of the complete ZEUS and H1 data sets from HERA I. Using the large Q^2, small Bjorken-x limits of the "wee" parton model, we connect the ultrahigh energy neutrino cross sections directly to the large Q^2, small-x extrapolation of our new fit, which we assume saturates the Froissart bound. We compare both to our previous work, which utilized only the smaller ZEUS data set, as well as to recent results of a calculation using the ZEUS-S based global perturbative QCD parton distributions using the combined HERA I results as input. Our new results substantiate our previous conclusions, again predicting significantly smaller cross sections than those predicted by extrapolating pQCD calculations to neutrino energies above 10^9 GeV. |
1507.01693 | Giulia Zanderighi | Giulia Zanderighi | QCD and High Energy Interactions: Moriond 2015 Theory Summary | 15 pages, 8 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I will summarise the new theory developments that emerged during the 2015 QCD
Moriond conference. I will give my perspective on some of the topics and
emphasise what I consider most relevant.
| [
{
"created": "Tue, 7 Jul 2015 07:42:38 GMT",
"version": "v1"
}
] | 2015-07-08 | [
[
"Zanderighi",
"Giulia",
""
]
] | I will summarise the new theory developments that emerged during the 2015 QCD Moriond conference. I will give my perspective on some of the topics and emphasise what I consider most relevant. |
1503.07661 | Asgeir Osland | Matti Herranen, Asgeir Osland, Anders Tranberg | Quantum corrections to inflaton dynamics, the semi-classical approach
and the semi-classical limit | Some revision and rewordings, added references. 16 pages | Phys. Rev. D 92, 083530 (2015) | 10.1103/PhysRevD.92.083530 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Computations of quantum corrections to the CMB spectrum and to scalar field
dynamics during inflation very often take advantage of the "semi-classical"
approach, where the metric fluctuations are simply omitted. On the other hand,
a complete computation ought to take into account that the matter field
perturbation and scalar metric perturbation together constitute a single
physical degree of freedom. The question then naturally arises, in which sense
the semi-classical approach is an approximation to the complete calculation,
and whether there are specific limits where this is also a good approximation.
We consider the quantum corrected dynamics of interacting scalar fields in an
expanding inflationary background. We demonstrate this by explicitly computing
the leading quantum radiative corrections to the evolution equation of the mean
field ("condensate") and the Friedmann equations taking into account scalar
perturbations of both the matter field and the metric, and when omitting the
latter. We find that the two agree in the limit H << M_pl , but one is not a
limit of the other. We also find that in simple models of inflation, H/M_pl is
not small enough that the two approaches can be said to agree. By direct
comparison, we demonstrate how to interpret the "semi-classical" approach often
employed in more complex computations as a well-defined approximation, and
quantify its validity.
| [
{
"created": "Thu, 26 Mar 2015 09:47:00 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2015 09:45:36 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Aug 2015 08:06:50 GMT",
"version": "v3"
}
] | 2015-11-04 | [
[
"Herranen",
"Matti",
""
],
[
"Osland",
"Asgeir",
""
],
[
"Tranberg",
"Anders",
""
]
] | Computations of quantum corrections to the CMB spectrum and to scalar field dynamics during inflation very often take advantage of the "semi-classical" approach, where the metric fluctuations are simply omitted. On the other hand, a complete computation ought to take into account that the matter field perturbation and scalar metric perturbation together constitute a single physical degree of freedom. The question then naturally arises, in which sense the semi-classical approach is an approximation to the complete calculation, and whether there are specific limits where this is also a good approximation. We consider the quantum corrected dynamics of interacting scalar fields in an expanding inflationary background. We demonstrate this by explicitly computing the leading quantum radiative corrections to the evolution equation of the mean field ("condensate") and the Friedmann equations taking into account scalar perturbations of both the matter field and the metric, and when omitting the latter. We find that the two agree in the limit H << M_pl , but one is not a limit of the other. We also find that in simple models of inflation, H/M_pl is not small enough that the two approaches can be said to agree. By direct comparison, we demonstrate how to interpret the "semi-classical" approach often employed in more complex computations as a well-defined approximation, and quantify its validity. |
1111.3294 | Tao Wang | Miao Li, Da Liu, Jun Meng, Tower Wang, Lanjun Zhou | Replaying neutrino bremsstrahlung with general dispersion relations | 16 pages, 3 figures; sect 5.5 added, squared amplitude corrected and
decay width adjusted accordingly | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generally held that neutrinos with superluminal velocity will lose
their energy spontaneously by radiating electron-positron pairs, similar to
bremsstrahlung process. Recently, this process was closely studied for
neutrinos whose energy is roughly proportional to their momentum. Confronted
with an increasing amount of superluminal neutrino models, it is urgent to
calculate the same process for general dispersion relations. The calculation is
performed in this paper, without resorting to any nontrivial frame such as the
effective "rest frame".
| [
{
"created": "Mon, 14 Nov 2011 17:29:06 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2012 09:42:31 GMT",
"version": "v2"
}
] | 2012-02-22 | [
[
"Li",
"Miao",
""
],
[
"Liu",
"Da",
""
],
[
"Meng",
"Jun",
""
],
[
"Wang",
"Tower",
""
],
[
"Zhou",
"Lanjun",
""
]
] | It is generally held that neutrinos with superluminal velocity will lose their energy spontaneously by radiating electron-positron pairs, similar to bremsstrahlung process. Recently, this process was closely studied for neutrinos whose energy is roughly proportional to their momentum. Confronted with an increasing amount of superluminal neutrino models, it is urgent to calculate the same process for general dispersion relations. The calculation is performed in this paper, without resorting to any nontrivial frame such as the effective "rest frame". |
1704.06222 | Amir N. Khan | Amir N. Khan, Douglas W. McKay | $\sin^2(\theta)w$ estimate and bounds on nonstandard interactions at
source and detector in the solar neutrino low-energy regime | 20 pages, 09 figures, lowest-energy value of sin^2(theta)w to date
has been reported. Some text added. New sub-section(7.5) added. Published in
JHEP | J. High Energ. Phys. (2017) 2017: 143 | 10.1007/JHEP07(2017)143 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the implications of the Borexino experiment's real time
measurements of the lowest energy part of the neutrino spectrum from the
primary pp fusion process up to 0.420 MeV through the 7^Be decay at 0.862 MeV
to the pep reaction at 1.44 MeV. We exploit the fact that at such low energies,
the large mixing angle solution to the Mikheyev-Smirnov-Wolfenstein matter
effects in the sun are small for 7^Be and pep and negligible for pp.
Consequently, the neutrinos produced in the sun change their flavor almost
entirely through vacuum oscillations during propagation from the sun's surface
and through possible nonstandard interactions acting at the solar source and
Borexino detector. We combine the different NSI effects at source and detector
in a single framework and use the current Borexino data to bound NSI
non-universal and flavor- changing parameters at energies below the reach of
reactor neutrino experiments. We also study the implication of the current data
for the weak- mixing angle at this "low-energy frontier" data from the Borexino
experiment, where it is expected to be slightly larger than its value at the Z
mass. We find $\sin^2(\theta)w=0.224+-0.016$, the lowest energy-scale estimate
to date. Looking to the future, we use projected sensitivities to solar
neutrinos in next generation dedicated solar experiments and direct dark matter
detection experiments and find a potential factor five improvement in
determination of the weak-mixing angle and up to an order of magnitude
improvement in probing the NSI parameters space.
| [
{
"created": "Thu, 20 Apr 2017 16:48:12 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2017 16:28:11 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Khan",
"Amir N.",
""
],
[
"McKay",
"Douglas W.",
""
]
] | We explore the implications of the Borexino experiment's real time measurements of the lowest energy part of the neutrino spectrum from the primary pp fusion process up to 0.420 MeV through the 7^Be decay at 0.862 MeV to the pep reaction at 1.44 MeV. We exploit the fact that at such low energies, the large mixing angle solution to the Mikheyev-Smirnov-Wolfenstein matter effects in the sun are small for 7^Be and pep and negligible for pp. Consequently, the neutrinos produced in the sun change their flavor almost entirely through vacuum oscillations during propagation from the sun's surface and through possible nonstandard interactions acting at the solar source and Borexino detector. We combine the different NSI effects at source and detector in a single framework and use the current Borexino data to bound NSI non-universal and flavor- changing parameters at energies below the reach of reactor neutrino experiments. We also study the implication of the current data for the weak- mixing angle at this "low-energy frontier" data from the Borexino experiment, where it is expected to be slightly larger than its value at the Z mass. We find $\sin^2(\theta)w=0.224+-0.016$, the lowest energy-scale estimate to date. Looking to the future, we use projected sensitivities to solar neutrinos in next generation dedicated solar experiments and direct dark matter detection experiments and find a potential factor five improvement in determination of the weak-mixing angle and up to an order of magnitude improvement in probing the NSI parameters space. |
2108.02871 | Igor Strakovsky | Igor I. Strakovsky (GW), William J. Briscoe (GW), Lubomir Pentchev
(JLab), and Axel Schmidt (GW) | Threshold Upsilon-meson Photoproduction at EIC and EicC | 6 pages, 6 figures, 3 tables | null | 10.1103/PhysRevD.104.074028 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | High-accuracy $\Upsilon$-meson photoproduction data from EIC and EicC
experiments will allow the measurement of the near-threshold total cross
section of the reaction $\gamma p\to\Upsilon p$, from which the absolute value
of the $\Upsilon p$ scattering length, $|\alpha_{\Upsilon p}|$, can be
extracted using a Vector-Meson Dominance model. For this evaluation, we used
$\Upsilon$-meson photoproduction quasi-data from the QCD approach (the
production amplitude can be factorized in terms of gluonic generalized parton
distributions and the quarkonium distribution amplitude). A comparative
analysis of $|\alpha_{\Upsilon p}|$ with the recently determined scattering
lengths for $\omega p$, $\phi p$, and $J/\psi p$ using the A2, CLAS, and GlueX
experimental data are performed. The role of the "young" vector-meson effect is
evaluated.
| [
{
"created": "Thu, 5 Aug 2021 22:23:58 GMT",
"version": "v1"
}
] | 2021-11-10 | [
[
"Strakovsky",
"Igor I.",
"",
"GW"
],
[
"Briscoe",
"William J.",
"",
"GW"
],
[
"Pentchev",
"Lubomir",
"",
"JLab"
],
[
"Schmidt",
"Axel",
"",
"GW"
]
] | High-accuracy $\Upsilon$-meson photoproduction data from EIC and EicC experiments will allow the measurement of the near-threshold total cross section of the reaction $\gamma p\to\Upsilon p$, from which the absolute value of the $\Upsilon p$ scattering length, $|\alpha_{\Upsilon p}|$, can be extracted using a Vector-Meson Dominance model. For this evaluation, we used $\Upsilon$-meson photoproduction quasi-data from the QCD approach (the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude). A comparative analysis of $|\alpha_{\Upsilon p}|$ with the recently determined scattering lengths for $\omega p$, $\phi p$, and $J/\psi p$ using the A2, CLAS, and GlueX experimental data are performed. The role of the "young" vector-meson effect is evaluated. |
hep-ph/0306283 | Thomas G. Rizzo | Thomas G. Rizzo | More Transverse Polarization Signatures of Extra Dimensions at Linear
Colliders | 20 pages, 5 figs, LaTex | JHEP 0308 (2003) 051 | 10.1088/1126-6708/2003/08/051 | SLAC-PUB-10001 | hep-ph | null | Polarization of both electron and positron beams at a future linear collider
(LC) allows for the measurement of transverse polarization asymmetries. These
asymmetries have been shown to be particularly sensitive to graviton or other
spin-2, $s-$channel exchanges in the process $e^+e^- \to f\bar f (f\neq e)$
which allows for a doubling of the usual search reach. A question then arises
as to whether other $e^+e^-$ processes also show comparable sensitivity. Here
we extend our previous analysis to the set of final states $e^+e^-,
W^+W^-,~2\gamma$ and $~2Z$ as well as to the M{\o}ller scattering process
$e^-e^-\to e^-e^-$. We demonstrate that these reactions yield transverse
polarization asymmetries which are somewhat less sensitive to graviton exchange
than are those obtained in our earlier analysis for $e^+e^-\to f\bar f$.
| [
{
"created": "Fri, 27 Jun 2003 21:24:56 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Rizzo",
"Thomas G.",
""
]
] | Polarization of both electron and positron beams at a future linear collider (LC) allows for the measurement of transverse polarization asymmetries. These asymmetries have been shown to be particularly sensitive to graviton or other spin-2, $s-$channel exchanges in the process $e^+e^- \to f\bar f (f\neq e)$ which allows for a doubling of the usual search reach. A question then arises as to whether other $e^+e^-$ processes also show comparable sensitivity. Here we extend our previous analysis to the set of final states $e^+e^-, W^+W^-,~2\gamma$ and $~2Z$ as well as to the M{\o}ller scattering process $e^-e^-\to e^-e^-$. We demonstrate that these reactions yield transverse polarization asymmetries which are somewhat less sensitive to graviton exchange than are those obtained in our earlier analysis for $e^+e^-\to f\bar f$. |
1804.06389 | Kourosh Nozari | M. Khodadi, K. Nozari, A. Bhat and S. Mohsenian | Probing Planck Scale Spacetime By Cavity Opto-Atomic $^{87}$Rb
Interferometry | 12 pages, 2 figures, Revised Version, Accepted for publication in
Progress of Theoretical and Experimental Physics | Prog Theor Exp Phys (2019) | 10.1093/ptep/ptz039 | null | hep-ph gr-qc hep-th physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The project of \emph{"quantum spacetime phenomenology"} focuses on searching
pragmatically for the Planck scale quantum features of spacetime. Among these
features is the existence of a characteristic length scale addressed commonly
by effective approaches to quantum gravity (QG). This characteristic length
scale could be realized, for instance and simply, by generalizing the standard
Heisenberg uncertainty principle (HUP) to a \emph{"generalized uncertainty
principle"} (GUP). While usually it is expected that phenomena belonging to the
realm of QG are essentially probable solely at the so-called Planck energy,
here we show how a GUP proposal containing the most general modification of
coordinate representation of the momentum operator could be probed by a
\emph{"cold atomic ensemble recoil experiment"} (CARE) as a low energy quantum
system. This proposed atomic interferometer setup has advantages over the
conventional architectures owing to the enclosure in a high finesse optical
cavity which is supported by a new class of low power consumption integrated
devices known as \emph{"micro-electro-opto-mechanical systems"} (MEOMS). The
proposed system comprises of a micro mechanical oscillator instead of spherical
confocal mirrors as one of the components of high finesse optical cavity. In
the framework of a bottom-up QG phenomenological viewpoint and by taking into
account the measurement accuracy realized for the fine structure constant (FSC)
from the Rubidium ($^{87}$Rb) CARE, we set some constraints as upper bounds on
the characteristic parameters of the underlying GUP. In the case of
superposition of the possible GUP modification terms, we managed to set a tight
constraint as $0.999978<\lambda_0<1.00002$ for the dimensionless characteristic
parameter.
| [
{
"created": "Thu, 12 Apr 2018 08:01:49 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2019 04:55:21 GMT",
"version": "v2"
}
] | 2019-12-06 | [
[
"Khodadi",
"M.",
""
],
[
"Nozari",
"K.",
""
],
[
"Bhat",
"A.",
""
],
[
"Mohsenian",
"S.",
""
]
] | The project of \emph{"quantum spacetime phenomenology"} focuses on searching pragmatically for the Planck scale quantum features of spacetime. Among these features is the existence of a characteristic length scale addressed commonly by effective approaches to quantum gravity (QG). This characteristic length scale could be realized, for instance and simply, by generalizing the standard Heisenberg uncertainty principle (HUP) to a \emph{"generalized uncertainty principle"} (GUP). While usually it is expected that phenomena belonging to the realm of QG are essentially probable solely at the so-called Planck energy, here we show how a GUP proposal containing the most general modification of coordinate representation of the momentum operator could be probed by a \emph{"cold atomic ensemble recoil experiment"} (CARE) as a low energy quantum system. This proposed atomic interferometer setup has advantages over the conventional architectures owing to the enclosure in a high finesse optical cavity which is supported by a new class of low power consumption integrated devices known as \emph{"micro-electro-opto-mechanical systems"} (MEOMS). The proposed system comprises of a micro mechanical oscillator instead of spherical confocal mirrors as one of the components of high finesse optical cavity. In the framework of a bottom-up QG phenomenological viewpoint and by taking into account the measurement accuracy realized for the fine structure constant (FSC) from the Rubidium ($^{87}$Rb) CARE, we set some constraints as upper bounds on the characteristic parameters of the underlying GUP. In the case of superposition of the possible GUP modification terms, we managed to set a tight constraint as $0.999978<\lambda_0<1.00002$ for the dimensionless characteristic parameter. |
hep-ph/9806437 | Bjoern Poetter | B. P\"otter | JetViP 1.1: Calculating One- and Two-Jet Cross Sections with Virtual
Photons in NLO QCD | 31 pages, LaTeX, 3 eps figures | Comput.Phys.Commun. 119 (1999) 45-66 | 10.1016/S0010-4655(99)00190-3 | DESY 98-071 | hep-ph | null | JetViP is a computer program for the calculation of inclusive single- and
dijet cross sections in eP- and e-gamma-scattering in NLO QCD. The virtuality
of the photon, radiated by the incoming electron, can be chosen in a continuous
range, reaching from photoproduction into deep inelastic scattering. The
various contributions to the full jet cross section, including the resolved
photon contributions, are implemented. The calculation is based on the
phase-space-slicing method.
| [
{
"created": "Mon, 22 Jun 1998 12:38:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Pötter",
"B.",
""
]
] | JetViP is a computer program for the calculation of inclusive single- and dijet cross sections in eP- and e-gamma-scattering in NLO QCD. The virtuality of the photon, radiated by the incoming electron, can be chosen in a continuous range, reaching from photoproduction into deep inelastic scattering. The various contributions to the full jet cross section, including the resolved photon contributions, are implemented. The calculation is based on the phase-space-slicing method. |
1407.7436 | Barbara Betz | Barbara Betz and Miklos Gyulassy | Azimuthal Jet Tomography at RHIC and LHC | 4 pages, 4 figures, proceedings of the Quark Matter 2014 conference | null | 10.1016/j.nuclphysa.2014.08.109 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results based on a generic jet-energy loss model that interpolates between
running coupling pQCD-based and AdS/CFT-inspired holographic prescriptions are
compared to recent data on the high-p_T pion nuclear modification factor and
the high-p_T elliptic flow in nuclear collisions at RHIC and LHC. The
jet-energy loss model is coupled to various (2+1)d (viscous hydrodynamic)
fields. The impact of energy-loss fluctuations is discussed. While a previously
proposed AdS/CFT jet-energy loss model with a temperature-independent
jet-medium coupling is shown to be inconsistent with the LHC data, we find a
rather broad class of jet-energy independent energy-loss models $dE/dx=
\kappa(T) x^z T^{2+z}$ that can account for the current data with different
temperature-dependent jet-medium couplings $\kappa(T)$ and path-length
dependence exponents of $0\le z \le 2$.
| [
{
"created": "Mon, 28 Jul 2014 14:56:52 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Betz",
"Barbara",
""
],
[
"Gyulassy",
"Miklos",
""
]
] | Results based on a generic jet-energy loss model that interpolates between running coupling pQCD-based and AdS/CFT-inspired holographic prescriptions are compared to recent data on the high-p_T pion nuclear modification factor and the high-p_T elliptic flow in nuclear collisions at RHIC and LHC. The jet-energy loss model is coupled to various (2+1)d (viscous hydrodynamic) fields. The impact of energy-loss fluctuations is discussed. While a previously proposed AdS/CFT jet-energy loss model with a temperature-independent jet-medium coupling is shown to be inconsistent with the LHC data, we find a rather broad class of jet-energy independent energy-loss models $dE/dx= \kappa(T) x^z T^{2+z}$ that can account for the current data with different temperature-dependent jet-medium couplings $\kappa(T)$ and path-length dependence exponents of $0\le z \le 2$. |
hep-ph/0606091 | Kochelev Nikolai Innokentevich | N.Kochelev | Soft Contribution to Quark-Quark Scattering Induced by an Anomalous
Chromomagnetic Interaction | 4 pages, 2 figures | JETP Lett. 83 (2006) 527-529 | null | null | hep-ph | null | We calculate the soft contribution to high energy quark-quark scattering that
arises from an instanton-induced quark anomalous chromomagnetic moment. We
demonstrate that this is a large contribution, which cannot be neglected for
transverse momenta of a few GeV. We discuss the influence of this effect on
inclusive particle production.
| [
{
"created": "Thu, 8 Jun 2006 01:04:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kochelev",
"N.",
""
]
] | We calculate the soft contribution to high energy quark-quark scattering that arises from an instanton-induced quark anomalous chromomagnetic moment. We demonstrate that this is a large contribution, which cannot be neglected for transverse momenta of a few GeV. We discuss the influence of this effect on inclusive particle production. |
1909.03063 | Hai-Yang Cheng | Hai-Yang Cheng, Cheng-Wei Chiang | Revisiting CP violation in $D\to P\!P$ and $V\!P$ decays | 31 pages, references updated, to appear in Phys. Rev. D. arXiv admin
note: text overlap with arXiv:1205.0580 | Phys. Rev. D 100, 093002 (2019) | 10.1103/PhysRevD.100.093002 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Direct CP violation in the hadronic charm decays provides a good testing
ground for the Kobayashi-Maskawa mechanism in the Standard Model. Any
significant deviations from the expectation would be indirect evidence of
physics beyond the Standard Model. In view of improved measurements from LHCb
and BESIII experiments, we re-analyze the Cabibbo-favored $D \to P\!P$ and
$V\!P$ decays in the topological diagram approach. By assuming certain
SU(3)-breaking effects in the tree-type amplitudes, we make predictions for
both branching fractions and CP asymmetries of the singly Cabibbo-suppressed
decay modes. While the color-allowed and -suppressed amplitudes are preferred
to scale by the factor dictated by factorization in the $P\!P$ modes, no such
scaling is required in the $V\!P$ modes. The $W$-exchange amplitudes are found
to change by 10\% to 50\% and depend on whether $d\overline{d}$ or
$s\overline{s}$ pair directly emerges from $W$-exchange. The predictions of
branching fractions are generally improved after these SU(3) symmetry breaking
effects are taken into account. We show in detail how the tree-type,
QCD-penguin, and weak penguin-annihilation diagrams contribute and modify CP
asymmetry predictions. Future measurements of sufficiently many direct CP
asymmetries will be very useful in removing a discrete ambiguity in the strong
phases as well as discriminating among different theory approaches. In
particular, we predict $a_{CP}(K^+K^-)-a_{CP}(\pi^+\pi^-) = (-1.14 \pm 0.26)
\times 10^{-3}$ or $(-1.25 \pm 0.25) \times 10^{-3}$, consistent with the
latest data, and $a_{CP}(K^+K^{*-})-a_{CP}(\pi^+\rho^-) = (-1.52 \pm 0.43)
\times 10^{-3}$, an attractive and measurable observable in the near future.
Moreover, we observe that such CP asymmetry differences are dominated by
long-distance penguin-exchange through final-state rescattering.
| [
{
"created": "Fri, 6 Sep 2019 13:26:18 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2019 14:18:54 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Chiang",
"Cheng-Wei",
""
]
] | Direct CP violation in the hadronic charm decays provides a good testing ground for the Kobayashi-Maskawa mechanism in the Standard Model. Any significant deviations from the expectation would be indirect evidence of physics beyond the Standard Model. In view of improved measurements from LHCb and BESIII experiments, we re-analyze the Cabibbo-favored $D \to P\!P$ and $V\!P$ decays in the topological diagram approach. By assuming certain SU(3)-breaking effects in the tree-type amplitudes, we make predictions for both branching fractions and CP asymmetries of the singly Cabibbo-suppressed decay modes. While the color-allowed and -suppressed amplitudes are preferred to scale by the factor dictated by factorization in the $P\!P$ modes, no such scaling is required in the $V\!P$ modes. The $W$-exchange amplitudes are found to change by 10\% to 50\% and depend on whether $d\overline{d}$ or $s\overline{s}$ pair directly emerges from $W$-exchange. The predictions of branching fractions are generally improved after these SU(3) symmetry breaking effects are taken into account. We show in detail how the tree-type, QCD-penguin, and weak penguin-annihilation diagrams contribute and modify CP asymmetry predictions. Future measurements of sufficiently many direct CP asymmetries will be very useful in removing a discrete ambiguity in the strong phases as well as discriminating among different theory approaches. In particular, we predict $a_{CP}(K^+K^-)-a_{CP}(\pi^+\pi^-) = (-1.14 \pm 0.26) \times 10^{-3}$ or $(-1.25 \pm 0.25) \times 10^{-3}$, consistent with the latest data, and $a_{CP}(K^+K^{*-})-a_{CP}(\pi^+\rho^-) = (-1.52 \pm 0.43) \times 10^{-3}$, an attractive and measurable observable in the near future. Moreover, we observe that such CP asymmetry differences are dominated by long-distance penguin-exchange through final-state rescattering. |
1701.08730 | Bertrand Duclou\'e | B. Duclou\'e | Nuclear modification of forward Drell-Yan production at the LHC | 6 pages, 7 figures. v2: published version | Phys. Rev. D 96, 094014 (2017) | 10.1103/PhysRevD.96.094014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Forward Drell-Yan production at high energy can provide important constraints
on gluon densities at small $x$, in the saturation regime. In this work we
focus on the nuclear modification of this process, which could be measured at
the LHC in the near future. For this we employ the color dipole approach, using
the optical Glauber model to relate the dipole cross section of a nucleus to
the one of a proton. Combining these results with our earlier results for
forward $J/\psi$ production, we compute the ratio of the nuclear modification
factors of these two processes. This observable was recently suggested as a way
to distinguish between initial and final state effects in forward particle
production.
| [
{
"created": "Mon, 30 Jan 2017 17:56:07 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2017 13:09:26 GMT",
"version": "v2"
}
] | 2017-11-21 | [
[
"Ducloué",
"B.",
""
]
] | Forward Drell-Yan production at high energy can provide important constraints on gluon densities at small $x$, in the saturation regime. In this work we focus on the nuclear modification of this process, which could be measured at the LHC in the near future. For this we employ the color dipole approach, using the optical Glauber model to relate the dipole cross section of a nucleus to the one of a proton. Combining these results with our earlier results for forward $J/\psi$ production, we compute the ratio of the nuclear modification factors of these two processes. This observable was recently suggested as a way to distinguish between initial and final state effects in forward particle production. |
2110.15319 | Joshua Isaacson | Joshua Isaacson, Stefan H\"oche, Diego Lopez Gutierrez, Noemi Rocco | A novel event generator for the automated simulation of neutrino
scattering | 13 pages, 8 figures | null | 10.1103/PhysRevD.105.096006 | FERMILAB-PUB-21-537-T, MCNET-21-31 | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | An event generation framework is presented that enables the automatic
simulation of events for next-generation neutrino experiments in the Standard
Model or extensions thereof. The new generator combines the calculation of the
leptonic current based on an automated matrix element generator, and the
computation of the hadronic current based on a state-of-the-art nuclear physics
model. The approach is validated in Standard-Model simulations for electron
scattering and neutrino scattering. Furthermore, the first fully-differential
neutrino trident production results are shown in the quasielastic region.
| [
{
"created": "Thu, 28 Oct 2021 17:33:54 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Feb 2022 15:37:34 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"Isaacson",
"Joshua",
""
],
[
"Höche",
"Stefan",
""
],
[
"Gutierrez",
"Diego Lopez",
""
],
[
"Rocco",
"Noemi",
""
]
] | An event generation framework is presented that enables the automatic simulation of events for next-generation neutrino experiments in the Standard Model or extensions thereof. The new generator combines the calculation of the leptonic current based on an automated matrix element generator, and the computation of the hadronic current based on a state-of-the-art nuclear physics model. The approach is validated in Standard-Model simulations for electron scattering and neutrino scattering. Furthermore, the first fully-differential neutrino trident production results are shown in the quasielastic region. |
1512.04901 | Robert Harlander | Robert V. Harlander | Higgs production in heavy quark annihilation through
next-to-next-to-leading order QCD | 21 pages, 7 figures, 1 table. Matches published version | null | 10.1140/epjc/s10052-016-4093-x | TTH-15-38 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The total inclusive cross section for charged and neutral Higgs production in
heavy-quark annihilation is presented through NNLO QCD. It is shown that, aside
from an overall factor, the partonic cross section is independent of the
initial-state quark flavors, and that any interference terms involving two
different Yukawa couplings vanish. A simple criterion for defining the central
renormalization and factorization scale is proposed. Its application to the
$b\bar bH$ process yields results which are compatible with the values usually
adopted for this process. Remarkably, we find little variation in these values
for the other initial-state quark flavors. Finally, we disentangle the impact
of the different parton luminosities from genuine hard NNLO effects and find
that, for the central scales, a naive rescaling by the parton luminosities
approximates the full result remarkably well.
| [
{
"created": "Tue, 15 Dec 2015 19:07:48 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2016 08:59:23 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Harlander",
"Robert V.",
""
]
] | The total inclusive cross section for charged and neutral Higgs production in heavy-quark annihilation is presented through NNLO QCD. It is shown that, aside from an overall factor, the partonic cross section is independent of the initial-state quark flavors, and that any interference terms involving two different Yukawa couplings vanish. A simple criterion for defining the central renormalization and factorization scale is proposed. Its application to the $b\bar bH$ process yields results which are compatible with the values usually adopted for this process. Remarkably, we find little variation in these values for the other initial-state quark flavors. Finally, we disentangle the impact of the different parton luminosities from genuine hard NNLO effects and find that, for the central scales, a naive rescaling by the parton luminosities approximates the full result remarkably well. |
2205.15061 | Julia Panteleeva | J.Yu. Panteleeva, E. Epelbaum, J. Gegelia, U.-G. Mei{\ss}ner | On the definition of electromagnetic local spatial densities for
composite spin-$1/2$ systems | null | null | 10.1103/PhysRevD.106.056019 | null | hep-ph hep-th nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | An unambiguous definition of the electromagnetic spatial densities for a
spin-1/2 system is proposed and worked out in the zero average momentum frame
and in moving frames. The obtained results are compared with the traditional
definition of the densities in terms of the three-dimensional Fourier
transforms of the electromagnetic form factors in the Breit frame.
| [
{
"created": "Mon, 30 May 2022 12:41:29 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Panteleeva",
"J. Yu.",
""
],
[
"Epelbaum",
"E.",
""
],
[
"Gegelia",
"J.",
""
],
[
"Meißner",
"U. -G.",
""
]
] | An unambiguous definition of the electromagnetic spatial densities for a spin-1/2 system is proposed and worked out in the zero average momentum frame and in moving frames. The obtained results are compared with the traditional definition of the densities in terms of the three-dimensional Fourier transforms of the electromagnetic form factors in the Breit frame. |
2111.08732 | Guo-Yuan Huang | Guo-yuan Huang and Newton Nath | Neutrino meets ultralight dark matter: $\boldsymbol{0\nu\beta\beta}$
decay and cosmology | 10 pages, 5 figures, v2: matching the published version | JCAP05(2022)034 | 10.1088/1475-7516/2022/05/034 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We explore the neutrinoless double beta ($0\nu \beta\beta$) decay induced by
an ultralight dark matter field coupled to neutrinos. The effect on
$0\nu\beta\beta$ decay is significant if the coupling violates the lepton
number, for which the $\Delta L=2$ transition is directly driven by the dark
matter field without further suppression of small neutrino masses. As the
ultralight dark matter can be well described by a classical field, the effect
features a periodic modulation pattern in decay events. However, we find that
in the early Universe such coupling will be very likely to alter the standard
cosmological results. In particular, the requirement of neutrino free-streaming
before the matter-radiation equality severely constrains the parameter space,
such that the future $0\nu \beta\beta$ decay experiments can hardly see any
signal even with a meV sensitivity to the effective neutrino mass.
| [
{
"created": "Tue, 16 Nov 2021 19:09:18 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2022 16:54:40 GMT",
"version": "v2"
}
] | 2022-06-17 | [
[
"Huang",
"Guo-yuan",
""
],
[
"Nath",
"Newton",
""
]
] | We explore the neutrinoless double beta ($0\nu \beta\beta$) decay induced by an ultralight dark matter field coupled to neutrinos. The effect on $0\nu\beta\beta$ decay is significant if the coupling violates the lepton number, for which the $\Delta L=2$ transition is directly driven by the dark matter field without further suppression of small neutrino masses. As the ultralight dark matter can be well described by a classical field, the effect features a periodic modulation pattern in decay events. However, we find that in the early Universe such coupling will be very likely to alter the standard cosmological results. In particular, the requirement of neutrino free-streaming before the matter-radiation equality severely constrains the parameter space, such that the future $0\nu \beta\beta$ decay experiments can hardly see any signal even with a meV sensitivity to the effective neutrino mass. |
hep-ph/0307004 | Hiroyuki Abe | Hiroyuki Abe | Spontaneous and dynamical symmetry breaking in higher-dimensional
space-time with boundary terms | Doctoral thesis, submitted to Department of Physics, Hiroshima
University (February 2003), 110 pages, 38 figures | null | null | null | hep-ph hep-th | null | In this thesis we study physics beyond the standard model focusing on the
quantum field theory in higher-dimensional space-time with some boundary terms.
The boundary term causes nontrivial consequences about the vacuum structure of
the higher-dimensional theory. We take particular note of two independent
solutions to the weak and Planck hierarchy problem: ``low scale supersymmetry''
and ``dynamical electroweak symmetry breaking.'' From a viewpoint of the low
scale supersymmetry, we study $F$ and $D$ term supersymmetry breaking effects
on sparticle spectra from a boundary. While we also investigate a
nonperturbative effect caused by a bulk (nonsupersymmetric) gauge dynamics on a
fermion bilinear condensation on a boundary, and analyze the dynamical symmetry
breaking on the brane. From these analyses we conclude that the field
localization in higher-dimensional space-time involves in a nontrivial vacuum
structure of the theory, and the resultant low energy four-dimensional
effective theory has phenomenologically interesting structure. In a framework
of purely four-dimensional theory, we also construct the above nontrivial
effect of localization in the extra dimension.
| [
{
"created": "Tue, 1 Jul 2003 04:27:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Abe",
"Hiroyuki",
""
]
] | In this thesis we study physics beyond the standard model focusing on the quantum field theory in higher-dimensional space-time with some boundary terms. The boundary term causes nontrivial consequences about the vacuum structure of the higher-dimensional theory. We take particular note of two independent solutions to the weak and Planck hierarchy problem: ``low scale supersymmetry'' and ``dynamical electroweak symmetry breaking.'' From a viewpoint of the low scale supersymmetry, we study $F$ and $D$ term supersymmetry breaking effects on sparticle spectra from a boundary. While we also investigate a nonperturbative effect caused by a bulk (nonsupersymmetric) gauge dynamics on a fermion bilinear condensation on a boundary, and analyze the dynamical symmetry breaking on the brane. From these analyses we conclude that the field localization in higher-dimensional space-time involves in a nontrivial vacuum structure of the theory, and the resultant low energy four-dimensional effective theory has phenomenologically interesting structure. In a framework of purely four-dimensional theory, we also construct the above nontrivial effect of localization in the extra dimension. |
0803.0796 | Yuji Omura | Hajime Ishimori, Tatsuo Kobayashi, Hiroshi Ohki, Yuji Omura, Ryo
Takahashi and Morimitsu Tanimoto | Soft supersymmetry breaking terms from D4 x Z2 lepton flavor symmetry | 17 pages, no figure, comments and refs added | Phys.Rev.D77:115005,2008 | 10.1103/PhysRevD.77.115005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the supersymmetric model with $D_4 \times Z_2$ lepton flavor
symmetry. We evaluate soft supersymmetry breaking terms, i.e. soft slepton
masses and A-terms, which are predicted in the $D_4$ flavor model. We consider
constraints due to experiments of flavor changing neutral current processes.
| [
{
"created": "Thu, 6 Mar 2008 06:24:33 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Apr 2008 04:53:20 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ishimori",
"Hajime",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Ohki",
"Hiroshi",
""
],
[
"Omura",
"Yuji",
""
],
[
"Takahashi",
"Ryo",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We study the supersymmetric model with $D_4 \times Z_2$ lepton flavor symmetry. We evaluate soft supersymmetry breaking terms, i.e. soft slepton masses and A-terms, which are predicted in the $D_4$ flavor model. We consider constraints due to experiments of flavor changing neutral current processes. |
1109.2117 | David Wilson | M. R. Pennington and D. J. Wilson | Are the Dressed Gluon and Ghost Propagators in the Landau Gauge
presently determined in the confinement regime of QCD? | 15 pages, 12 figures. v2: references added and updated, minor
corrections to text, Fig. 12 updated, matches journal version | Phys.Rev.D84:094028,2011; Publisher's Note:
Phys.Rev.D84:119901(E),2011 | 10.1103/PhysRevD.84.094028 | JLAB-THY-11-1426 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Gluon and Ghost propagators in Landau gauge QCD are investigated using
the Schwinger-Dyson equation approach. Working in Euclidean spacetime, we solve
for these propagators using a selection of vertex inputs, initially for the
ghost equation alone and then for both propagators simultaneously. The results
are shown to be highly sensitive to the choices of vertices. We favor the
infrared finite ghost solution from studying the ghost equation alone where we
argue for a specific unique solution. In order to solve this simultaneously
with the gluon using a dressed-one-loop truncation, we find that a non-trivial
full ghost-gluon vertex is required in the vanishing gluon momentum limit. The
self-consistent solutions we obtain correspond to having a mass-like term in
the gluon propagator dressing, in agreement with similar studies supporting the
long held proposal of Cornwall.
| [
{
"created": "Fri, 9 Sep 2011 20:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2011 13:38:26 GMT",
"version": "v2"
}
] | 2012-01-12 | [
[
"Pennington",
"M. R.",
""
],
[
"Wilson",
"D. J.",
""
]
] | The Gluon and Ghost propagators in Landau gauge QCD are investigated using the Schwinger-Dyson equation approach. Working in Euclidean spacetime, we solve for these propagators using a selection of vertex inputs, initially for the ghost equation alone and then for both propagators simultaneously. The results are shown to be highly sensitive to the choices of vertices. We favor the infrared finite ghost solution from studying the ghost equation alone where we argue for a specific unique solution. In order to solve this simultaneously with the gluon using a dressed-one-loop truncation, we find that a non-trivial full ghost-gluon vertex is required in the vanishing gluon momentum limit. The self-consistent solutions we obtain correspond to having a mass-like term in the gluon propagator dressing, in agreement with similar studies supporting the long held proposal of Cornwall. |
1609.03030 | Ajay Kumar Rai | Zalak Shah, Kaushal Thakkar and Ajay Kumar Rai | Excited State Mass spectra of doubly heavy baryons $\Omega_{cc}$,
$\Omega_{bb}$ and $\Omega_{bc}$ | 10 pages, 5 figures | Eur. Phys. J. C (2016) 76:530 | 10.1140/epjc/s10052-016-4379-z | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the mass spectrum of $\Omega$ baryon with two heavy quarks and one
light quark (\textit{ccs, bbs and bcs}). The main goal of the paper is to
calculate the ground state masses and after that, the positive and negative
parity excited states masses are also obtained within a Hypercentral
Constituent quark model, using coulomb plus linear potential framework. We also
added first order correction to the potential. The mass spectra upto 5S for
radial excited states and 1P-5P, 1D-4D and 1F-2F states for orbital excited
states are computed for $\Omega_{cc}$, $\Omega_{bb}$ and $\Omega_{bc}$ baryons.
Our obtained results are compared with other theoretical predictions which
could be a useful complementary tool for the interpretation of experimentaly
unknown heavy baryon spectra. The Regge trajectory is constructed in both
($n_r$, $M^{2}$) and ($J$, $M^{2}$) planes for $\Omega_{cc}$,$\Omega_{bb}$ and
$\Omega_{bc}$ baryons and their slopes and intercepts are also determined.
Magnetic moments of doubly heavy $\Omega'$s are also calculated.
| [
{
"created": "Sat, 10 Sep 2016 11:34:34 GMT",
"version": "v1"
}
] | 2016-09-30 | [
[
"Shah",
"Zalak",
""
],
[
"Thakkar",
"Kaushal",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | We discuss the mass spectrum of $\Omega$ baryon with two heavy quarks and one light quark (\textit{ccs, bbs and bcs}). The main goal of the paper is to calculate the ground state masses and after that, the positive and negative parity excited states masses are also obtained within a Hypercentral Constituent quark model, using coulomb plus linear potential framework. We also added first order correction to the potential. The mass spectra upto 5S for radial excited states and 1P-5P, 1D-4D and 1F-2F states for orbital excited states are computed for $\Omega_{cc}$, $\Omega_{bb}$ and $\Omega_{bc}$ baryons. Our obtained results are compared with other theoretical predictions which could be a useful complementary tool for the interpretation of experimentaly unknown heavy baryon spectra. The Regge trajectory is constructed in both ($n_r$, $M^{2}$) and ($J$, $M^{2}$) planes for $\Omega_{cc}$,$\Omega_{bb}$ and $\Omega_{bc}$ baryons and their slopes and intercepts are also determined. Magnetic moments of doubly heavy $\Omega'$s are also calculated. |
hep-ph/0212320 | Alejandro Ayala | Alejandro Ayala (ICN-UNAM) | Density effects on the pion dispersion relation at finite temperature | 8 pages 4 eps figures. Invited talk given at the X Mexican School of
Particles and Fields, Playa del Carmen, Mexico 2002 | AIP Conf.Proc. 670 (2003) 11-18 | 10.1063/1.1594313 | null | hep-ph | null | We study the behavior of the pion dispersion relation in a pion medium at
finite density and temperature, introducing a chemical potential to describe
the finite pion number density. Such description is particularly important
during the hadronic phase of a relativistic heavy-ion collision, between
chemical and thermal freeze-out, where the pion number changing processes,
driven by the strong interaction, can be considered to be frozen. We make use
of an effective Lagrangian that explicitly respects chiral symmetry through the
enforcement of the chiral Ward identities. The pion dispersion relation is
computed through the computation of the pion self-energy in a non-perturbative
fashion by giving an approximate solution to the Schwinger-Dyson equation for
this self-energy. The dispersion relation is described in terms of a density
and temperature dependent mass and an index of refraction which is also
temperature, density as well as momentum dependent. The index of refraction is
larger than unity for all values of the momentum for finite \mu and T. Given
the strong coupling between \rho vectors and pions, we argue that the
modification of the pion mass due to finite pion density effects has to be
taken into account self-consistently for the description of the in-medium
modifications of \rho's.
| [
{
"created": "Fri, 20 Dec 2002 19:59:26 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ayala",
"Alejandro",
"",
"ICN-UNAM"
]
] | We study the behavior of the pion dispersion relation in a pion medium at finite density and temperature, introducing a chemical potential to describe the finite pion number density. Such description is particularly important during the hadronic phase of a relativistic heavy-ion collision, between chemical and thermal freeze-out, where the pion number changing processes, driven by the strong interaction, can be considered to be frozen. We make use of an effective Lagrangian that explicitly respects chiral symmetry through the enforcement of the chiral Ward identities. The pion dispersion relation is computed through the computation of the pion self-energy in a non-perturbative fashion by giving an approximate solution to the Schwinger-Dyson equation for this self-energy. The dispersion relation is described in terms of a density and temperature dependent mass and an index of refraction which is also temperature, density as well as momentum dependent. The index of refraction is larger than unity for all values of the momentum for finite \mu and T. Given the strong coupling between \rho vectors and pions, we argue that the modification of the pion mass due to finite pion density effects has to be taken into account self-consistently for the description of the in-medium modifications of \rho's. |
hep-ph/0110163 | Kingman Cheung | Kingman Cheung (National Center for Theoretical Sciences, Taiwan) | Black hole production and Large Extra Dimensions | 4 pages, constraint of entropy is included and cross sections
changed, some new references are added | Phys.Rev.Lett.88:221602,2002 | 10.1103/PhysRevLett.88.221602 | NSC-NCTS-011012 | hep-ph hep-th | null | Black hole (BH) production at colliders is possible when the colliding energy
is above the Planck scale, which can effectively be at TeV scale in models of
large extra dimensions. In this work, we study the production of black holes at
colliders and discuss the possible signatures. We point out the ``$ij\to {\rm
BH}+ $ others'' subprocesses, in which the BH and other SM particles are
produced with a large transverse momentum. When the BH decays, it gives a
signature that consists of particles of high multiplicity in a boosted
spherical shape on one side of the event and a few number of high $p_T$ partons
on the other side, which provide very useful tags for the event.
| [
{
"created": "Fri, 12 Oct 2001 03:30:12 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2002 16:16:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cheung",
"Kingman",
"",
"National Center for Theoretical Sciences, Taiwan"
]
] | Black hole (BH) production at colliders is possible when the colliding energy is above the Planck scale, which can effectively be at TeV scale in models of large extra dimensions. In this work, we study the production of black holes at colliders and discuss the possible signatures. We point out the ``$ij\to {\rm BH}+ $ others'' subprocesses, in which the BH and other SM particles are produced with a large transverse momentum. When the BH decays, it gives a signature that consists of particles of high multiplicity in a boosted spherical shape on one side of the event and a few number of high $p_T$ partons on the other side, which provide very useful tags for the event. |
2003.13219 | Hiroshi Okada | Hiroshi Okada, Yutaro Shoji | A radiative seesaw model with three Higgs doublets in modular $A_4$
symmetry | 19 pages, 2 tables, 6 figures; version accepted for publication in
Nuclear Physics B, discussions on LFVs and fixed point at tau=i are added | null | 10.1016/j.nuclphysb.2020.115216 | APCTP Pre2020 - 005 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a radiative seesaw model based on a modular $A_4$ symmetry, which
has good predictability in the lepton sector. We execute a numerical analysis
to search for parameters that satisfy the experimental constraints such as
those from neutrino oscillation data and lepton flavor violations. Then, we
present several predictions in our model that originate from the modular
symmetry at a fixed point as well as fundamental region of $\tau$.
| [
{
"created": "Mon, 30 Mar 2020 04:54:07 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2020 06:22:02 GMT",
"version": "v2"
}
] | 2020-12-02 | [
[
"Okada",
"Hiroshi",
""
],
[
"Shoji",
"Yutaro",
""
]
] | We propose a radiative seesaw model based on a modular $A_4$ symmetry, which has good predictability in the lepton sector. We execute a numerical analysis to search for parameters that satisfy the experimental constraints such as those from neutrino oscillation data and lepton flavor violations. Then, we present several predictions in our model that originate from the modular symmetry at a fixed point as well as fundamental region of $\tau$. |
1003.2132 | Joao Pacheco B. C. de Melo Dr. | J. P. B. C. de Melo, and T. Frederico (Laborat\'orio de F\'isica
Teorica e Computa\c{c}\~ao Cientifica, LFTC, Universidade Cruzeiro do Sul,
S\~ao Paulo, Brazil and Instituto de F\'isica Te\'orica, Universidade
Estadual Paulista, IFT-UNESP, S\~ao Paulo, Brazil, Dep. de F\'isica,
Instituto Tecnol\'ogico de Aeron\'autica, S\~ao Jos\'e dos Campos, Brazil.) | Light-Front Model of Transition Form-Factors in Heavy Meson Decay | Paper with 5 pages and 2 eps figures. To appear to Nuclear Physics B.
Talk at Light Cone 2009: Relativistic Hadronic and Particle Physics (LC
2009), Sao Jose dos Campos, S.P, Brazil, 8-13 Jul 2009. | Nucl.Phys.Proc.Suppl.199:276-280,2010 | 10.1016/j.nuclphysbps.2010.02.043 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electroweak transition form factors of heavy meson decays are important
ingredients in the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix
elements from experimental data. In this work, within a light-front framework,
we calculate electroweak transition form factor for the semileptonic decay of
$D$ mesons into a pion or a kaon. The model results underestimate in both cases
the new data of CLEO for the larger momentum transfers accessible in the
experiment. We discuss possible reasons for that in order to improve the model.
| [
{
"created": "Wed, 10 Mar 2010 15:47:29 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"de Melo",
"J. P. B. C.",
"",
"Laboratório de Física\n Teorica e Computação Cientifica, LFTC, Universidade Cruzeiro do Sul,\n São Paulo, Brazil and Instituto de Física Teórica, Universidade\n Estadual Paulista, IFT-UNESP, São Paulo, Brazil, Dep. de Física,\n Instituto Tecnológico de Aeronáutica, São José dos Campos, Brazil."
],
[
"Frederico",
"T.",
"",
"Laboratório de Física\n Teorica e Computação Cientifica, LFTC, Universidade Cruzeiro do Sul,\n São Paulo, Brazil and Instituto de Física Teórica, Universidade\n Estadual Paulista, IFT-UNESP, São Paulo, Brazil, Dep. de Física,\n Instituto Tecnológico de Aeronáutica, São José dos Campos, Brazil."
]
] | Electroweak transition form factors of heavy meson decays are important ingredients in the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements from experimental data. In this work, within a light-front framework, we calculate electroweak transition form factor for the semileptonic decay of $D$ mesons into a pion or a kaon. The model results underestimate in both cases the new data of CLEO for the larger momentum transfers accessible in the experiment. We discuss possible reasons for that in order to improve the model. |
2201.04991 | V. E. Troitsky | A.F. Krutov, V.E. Troitsky | Relativistic composite-particle theory of the gravitational form factors
of pion: quantitative results | 13 pages, 3 figures (5 panels), RevTex 4-2. V3: considerable changes
in presentaton, results unchanged. Version accepted by PRD | Phys. Rev. D 106 (2022) 054013 | 10.1103/PhysRevD.106.054013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a version of the instant-form relativistic quantum mechanics of
composite systems to obtain the gravitational form factors of the pion in a
common approach to its electroweak and gravitational properties. In the
preceding work [arXiv:2010.11640] we formulated the mathematical background,
presented the principal scheme of calculation and testified the obtained
qualitative results to satisfy the general constraints given by the principles
of the theory of hadron structure. In the present work we give the detailed
calculation of the gravitational form factors in large range of momentum
transfer, their static limits and the slopes at zero value, the mean-square
mass and mechanical radii of the pion. Now we take into account the
qravitational structure of the constituent quarks. We show that the results are
almost insensitive to the type of the model two-quark wave function in a close
analogy to the case of the pion electromagnetic form factor. We present a
correct calculation of the form factor $D$ and corresponding matrix element of
the energy-momentum tensor, going beyond the scope of the modified impulse
approximation. Most of the parameters that we use for the calculation had been
fixed even earlier in our works on the pion electromagnetic form factors. The
only free parameter is the $D$-term of the constituent quark, which we fix by
fitting the result for the slope at zero of the normalized to pion $D$-term
form factor $D$ of pion, to a choosen experimental value.
| [
{
"created": "Thu, 13 Jan 2022 14:03:46 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jan 2022 11:33:25 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Sep 2022 13:30:38 GMT",
"version": "v3"
}
] | 2022-09-16 | [
[
"Krutov",
"A. F.",
""
],
[
"Troitsky",
"V. E.",
""
]
] | We use a version of the instant-form relativistic quantum mechanics of composite systems to obtain the gravitational form factors of the pion in a common approach to its electroweak and gravitational properties. In the preceding work [arXiv:2010.11640] we formulated the mathematical background, presented the principal scheme of calculation and testified the obtained qualitative results to satisfy the general constraints given by the principles of the theory of hadron structure. In the present work we give the detailed calculation of the gravitational form factors in large range of momentum transfer, their static limits and the slopes at zero value, the mean-square mass and mechanical radii of the pion. Now we take into account the qravitational structure of the constituent quarks. We show that the results are almost insensitive to the type of the model two-quark wave function in a close analogy to the case of the pion electromagnetic form factor. We present a correct calculation of the form factor $D$ and corresponding matrix element of the energy-momentum tensor, going beyond the scope of the modified impulse approximation. Most of the parameters that we use for the calculation had been fixed even earlier in our works on the pion electromagnetic form factors. The only free parameter is the $D$-term of the constituent quark, which we fix by fitting the result for the slope at zero of the normalized to pion $D$-term form factor $D$ of pion, to a choosen experimental value. |
0810.3961 | Navneet Kumar Pruthi | Neetika Sharma, Avinash C. Sharma | Weak Hadronic decays of Charmed Baryons and Current-Algebra Scheme | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The weak decay of charmed baryons multiplets into ground state and mesons are
investigated using current algebra technique. Some of the interesting results
on the partial decays rates and the asymmetry parameters for
$\Delta$C=$\Delta$S=-1 the mode are calculated and consequences discussed
| [
{
"created": "Wed, 22 Oct 2008 03:07:24 GMT",
"version": "v1"
}
] | 2008-10-23 | [
[
"Sharma",
"Neetika",
""
],
[
"Sharma",
"Avinash C.",
""
]
] | The weak decay of charmed baryons multiplets into ground state and mesons are investigated using current algebra technique. Some of the interesting results on the partial decays rates and the asymmetry parameters for $\Delta$C=$\Delta$S=-1 the mode are calculated and consequences discussed |
2311.00029 | Di Liu | Yann Gouttenoire, Eric Kuflik, Di Liu | Heavy Baryon Dark Matter from $SU(N)$ Confinement: Bubble Wall Velocity
and Boundary Effects | 35 pages, 10 figures, comments are welcomed | null | null | LAPTH-055/23 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Confinement in $SU(N_{\rm DC})$ Yang-Mills theories is known to proceed
through first-order phase transition. The wall velocity is bounded by $v_w
\lesssim 10^{-6}$ due to the needed time for the substantial latent heat
released during the phase transition to dissipate through Hubble expansion.
Quarks much heavier than the confinement scale can be introduced without
changing the confinement dynamics. After they freeze-out, heavy quarks are
squeezed into pockets of the deconfined phase until they completely annihilate
with anti-quarks. We calculate the dark baryon abundance surviving
annihilation, due to bound-state formation occurring both in the bulk and - for
the first time - at the boundary. We find that dark baryons can be dark matter
with a mass up to $10^3~\rm TeV$. We study indirect and direct detection, CMB
and BBN probes, assuming portals to Higgs and neutrinos.
| [
{
"created": "Tue, 31 Oct 2023 18:00:01 GMT",
"version": "v1"
}
] | 2023-11-02 | [
[
"Gouttenoire",
"Yann",
""
],
[
"Kuflik",
"Eric",
""
],
[
"Liu",
"Di",
""
]
] | Confinement in $SU(N_{\rm DC})$ Yang-Mills theories is known to proceed through first-order phase transition. The wall velocity is bounded by $v_w \lesssim 10^{-6}$ due to the needed time for the substantial latent heat released during the phase transition to dissipate through Hubble expansion. Quarks much heavier than the confinement scale can be introduced without changing the confinement dynamics. After they freeze-out, heavy quarks are squeezed into pockets of the deconfined phase until they completely annihilate with anti-quarks. We calculate the dark baryon abundance surviving annihilation, due to bound-state formation occurring both in the bulk and - for the first time - at the boundary. We find that dark baryons can be dark matter with a mass up to $10^3~\rm TeV$. We study indirect and direct detection, CMB and BBN probes, assuming portals to Higgs and neutrinos. |
1207.3699 | Alexandre Alves | Alexandre Alves, A. G. Dias, E. Ramirez Barreto, C. A. de S. Pires,
Farinaldo S. Queiroz, and P. S. Rodrigues da Silva | Explaining the Higgs Decays at the LHC with an Extended Electroweak
Model | 16 pages, 5 figures | null | 10.1140/epjc/s10052-013-2288-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the recent discovery of a new boson at the LHC, which we assume
to be a Higgs boson, and the observed enhancement in its diphoton decays
compared to the SM prediction, can be explained by a new doublet of charged
vector bosons from an extended electroweak gauge sector model with
SU(3)$_C\otimesSU(3)_L\otimesU(1)_X$ symmetry. Our results show a good
agreement between our theoretical expected sensitivity to a 126--125 GeV Higgs
boson and the experimental significance observed in the diphoton channel at the
8 TeV LHC. Effects of an invisible decay channel for the Higgs boson are also
taken into account, in order to anticipate a possible confirmation of deficits
in the branching ratios into $ZZ^*$, $WW^*$, bottom quarks, and tau leptons.
| [
{
"created": "Mon, 16 Jul 2012 14:55:54 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jul 2012 14:37:10 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Alves",
"Alexandre",
""
],
[
"Dias",
"A. G.",
""
],
[
"Barreto",
"E. Ramirez",
""
],
[
"Pires",
"C. A. de S.",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
]
] | We show that the recent discovery of a new boson at the LHC, which we assume to be a Higgs boson, and the observed enhancement in its diphoton decays compared to the SM prediction, can be explained by a new doublet of charged vector bosons from an extended electroweak gauge sector model with SU(3)$_C\otimesSU(3)_L\otimesU(1)_X$ symmetry. Our results show a good agreement between our theoretical expected sensitivity to a 126--125 GeV Higgs boson and the experimental significance observed in the diphoton channel at the 8 TeV LHC. Effects of an invisible decay channel for the Higgs boson are also taken into account, in order to anticipate a possible confirmation of deficits in the branching ratios into $ZZ^*$, $WW^*$, bottom quarks, and tau leptons. |
1204.4820 | Igor Lokhtin P. | I. P. Lokhtin, A. V. Belyaev, L. V. Malinina, S. V. Petrushanko, E. P.
Rogochaya, A. M. Snigirev | Hadron spectra, flow and correlations in PbPb collisions at the LHC:
interplay between soft and hard physics | 10 pages including 7 figures as EPS-files; prepared using LaTeX
package for publication in the European Physical Journal C | Eur.Phys.J.C72:2045,2012 | 10.1140/epjc/s10052-012-2045-7 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The started LHC heavy ion program makes it possible to probe new frontiers of
the high temperature Quantum Chromodynamics. It is expected that the role of
hard and semi-hard particle production processes may be significant at
ultra-high energies even for bulk properties of the created matter. In this
paper, the LHC data on multiplicity, hadron spectra, elliptic flow and
femtoscopic correlations from PbPb collisions at center-of-mass energy 2.76 TeV
per nucleon pair are analyzed in the framework of the HYDJET++ model. The
influence of the jet production mechanism on these observables is discussed.
| [
{
"created": "Sat, 21 Apr 2012 15:36:49 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2012 07:47:48 GMT",
"version": "v2"
}
] | 2012-09-20 | [
[
"Lokhtin",
"I. P.",
""
],
[
"Belyaev",
"A. V.",
""
],
[
"Malinina",
"L. V.",
""
],
[
"Petrushanko",
"S. V.",
""
],
[
"Rogochaya",
"E. P.",
""
],
[
"Snigirev",
"A. M.",
""
]
] | The started LHC heavy ion program makes it possible to probe new frontiers of the high temperature Quantum Chromodynamics. It is expected that the role of hard and semi-hard particle production processes may be significant at ultra-high energies even for bulk properties of the created matter. In this paper, the LHC data on multiplicity, hadron spectra, elliptic flow and femtoscopic correlations from PbPb collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed in the framework of the HYDJET++ model. The influence of the jet production mechanism on these observables is discussed. |
hep-ph/9707262 | Leonard Haakman | L.P.A. Haakman (NIKHEF), O.K. Kancheli (ITEP), J.H. Koch (NIKHEF) | The BFKL Pomeron with running coupling constant: how much of its hard
nature survives? | 23 pages REVTEX and 4 figures included | Nucl.Phys. B518 (1998) 275-302 | 10.1016/S0550-3213(98)00034-0 | NIKHEF 97-020 | hep-ph | null | We discuss the BFKL equation with a running gauge coupling and identify in
its solutions the contributions originating from different transverse momentum
scales. We show that for a running coupling constant the distribution of the
gluons making up the BFKL Pomeron shifts to smaller transverse momenta so that
the dominant part of Pomeron can have a nonperturbative origin. It is
demonstrated how this soft physics enters into the BFKL solution through the
boundary condition. We consider two kinematical regimes leading to different
behaviour of the rapidity and transverse momentum dependence of the gluon
distribution. In the diffusion approximation to the BFKL kernel with running
$\alpha_s$, we find a sequence of poles which replaces the cut for fixed
$\alpha_s$. The second regime corresponds to the singular part of the kernel,
which gives the dominant contribution in the limit of very large transverse
momenta. Finally, a simple more general picture is obtained for the QCD Pomeron
in hard processes: it is of soft, nonperturbative nature, but has hard ends of
DGLAP-type.
| [
{
"created": "Mon, 7 Jul 1997 12:26:12 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Haakman",
"L. P. A.",
"",
"NIKHEF"
],
[
"Kancheli",
"O. K.",
"",
"ITEP"
],
[
"Koch",
"J. H.",
"",
"NIKHEF"
]
] | We discuss the BFKL equation with a running gauge coupling and identify in its solutions the contributions originating from different transverse momentum scales. We show that for a running coupling constant the distribution of the gluons making up the BFKL Pomeron shifts to smaller transverse momenta so that the dominant part of Pomeron can have a nonperturbative origin. It is demonstrated how this soft physics enters into the BFKL solution through the boundary condition. We consider two kinematical regimes leading to different behaviour of the rapidity and transverse momentum dependence of the gluon distribution. In the diffusion approximation to the BFKL kernel with running $\alpha_s$, we find a sequence of poles which replaces the cut for fixed $\alpha_s$. The second regime corresponds to the singular part of the kernel, which gives the dominant contribution in the limit of very large transverse momenta. Finally, a simple more general picture is obtained for the QCD Pomeron in hard processes: it is of soft, nonperturbative nature, but has hard ends of DGLAP-type. |
hep-ph/0305062 | Hiroyuki Hagura | Hirotaka Sugawara (Univ. of Hawaii), Hiroyuki Hagura (KEK) and Toshiya
Sanami (KEK) | Destruction of Nuclear Bombs Using Ultra-High Energy Neutrino Beam | 18 pages, 8 figures, LaTeX2e; Typos corrected, some Figs. modified
and Refs. added | null | null | KEK-TH-882 | hep-ph hep-ex | null | We discuss the possibility of utilizing the ultra-high energy neutrino beam
(about 1000 TeV) to detect and destroy the nuclear bombs wherever they are and
whoever possess them.
| [
{
"created": "Wed, 7 May 2003 05:03:19 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jun 2003 15:41:33 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sugawara",
"Hirotaka",
"",
"Univ. of Hawaii"
],
[
"Hagura",
"Hiroyuki",
"",
"KEK"
],
[
"Sanami",
"Toshiya",
"",
"KEK"
]
] | We discuss the possibility of utilizing the ultra-high energy neutrino beam (about 1000 TeV) to detect and destroy the nuclear bombs wherever they are and whoever possess them. |
hep-ph/0012186 | Tatsu Takeuchi | Tatsu Takeuchi, Lay Nam Chang, Oleg Lebedev, and Will Loinaz | Universal Torsion Induced Interaction from Large Extra Dimensions | 4 pages LaTeX, style files included. Talk presented by Takeuchi at
LCWS2000 | null | 10.1063/1.1394388 | VPI-IPPAP-00-06 | hep-ph | null | We consider a model with extra compact dimensions in which only gravity
exists in the 4+n dimensional bulk. If the gravitational connection is not
assumed to be symmetric, that is, unless torsion is artificially set to zero,
then a universal contact interaction among the fermions on the 4-dimensional
wall is induced. Using a global fit to Z-pole observables, we find the 3 sigma
bound on the scale of quantum gravity to be M_S = 28 TeV for n=2. If Dirac or
light sterile neutrinos are present, the data from SN1987A increase the bound
to \sqrt{n} M_S >= 210 TeV.
| [
{
"created": "Fri, 15 Dec 2000 08:49:12 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Takeuchi",
"Tatsu",
""
],
[
"Chang",
"Lay Nam",
""
],
[
"Lebedev",
"Oleg",
""
],
[
"Loinaz",
"Will",
""
]
] | We consider a model with extra compact dimensions in which only gravity exists in the 4+n dimensional bulk. If the gravitational connection is not assumed to be symmetric, that is, unless torsion is artificially set to zero, then a universal contact interaction among the fermions on the 4-dimensional wall is induced. Using a global fit to Z-pole observables, we find the 3 sigma bound on the scale of quantum gravity to be M_S = 28 TeV for n=2. If Dirac or light sterile neutrinos are present, the data from SN1987A increase the bound to \sqrt{n} M_S >= 210 TeV. |
hep-ph/0406334 | Giovanni Ossola | A.Ferroglia, G.Ossola, and A.Sirlin | Bounds on the Higgs Boson Mass from M_W | 12 pages, 4 figures, talk given at the Incontri sulla Fisica delle
Alte Energie, XVI Ciclo di Incontri, Torino, Italy, April 14-16, 2004 | null | null | null | hep-ph | null | Recent experimental and theoretical progress in the M_H estimates from M_W
and Sin^2_eff_lept is reviewed, with particular emphasis on the role played by
M_t. Assuming that the SM is correct and taking into account the lower bound on
M_H from direct searches, we derive restrictive bounds on M_W and M_t. We also
discuss a representative ``benchmark'' scenario for the possible future
evolution of these parameters. Amusingly, this benchmark scenario suggested
some time ago a value for M_t that turned out to be in very close agreement
with its most recent experimental determination.
| [
{
"created": "Wed, 30 Jun 2004 13:29:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ferroglia",
"A.",
""
],
[
"Ossola",
"G.",
""
],
[
"Sirlin",
"A.",
""
]
] | Recent experimental and theoretical progress in the M_H estimates from M_W and Sin^2_eff_lept is reviewed, with particular emphasis on the role played by M_t. Assuming that the SM is correct and taking into account the lower bound on M_H from direct searches, we derive restrictive bounds on M_W and M_t. We also discuss a representative ``benchmark'' scenario for the possible future evolution of these parameters. Amusingly, this benchmark scenario suggested some time ago a value for M_t that turned out to be in very close agreement with its most recent experimental determination. |
hep-ph/0501143 | Alexander Vereshagin | Kirill Semenov-Tian-Shansky (St.-Petersburg State University and
Universit'e de Li`ege au Sart Tilman) | Bootstrap Equations for String-Like Amplitude | 7 pages, talk given at QFTHEP 2004, Russia, June 2004, to be
published in Proceedings | null | null | null | hep-ph | null | One of the ways to check the consistency of our effective field theory (EFT)
approach (explained by A.Vereshagin and V.Vereshagin at this conference) is to
perform the numerical testing of those sum rules for hadron resonance
parameters which follow from the system of bootstrap constrains. In this talk
we discuss the peculiar features of this procedure for the case of exactly
solvable bootstrap model based on Veneziano string amplitude. This allows us to
simulate different situations that may encounter in realistic EFT models. We
also make a short review of the technique that may be useful for further
analysis of various bootstrap systems.
| [
{
"created": "Sat, 15 Jan 2005 17:07:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Semenov-Tian-Shansky",
"Kirill",
"",
"St.-Petersburg State University and\n Universit'e de Li`ege au Sart Tilman"
]
] | One of the ways to check the consistency of our effective field theory (EFT) approach (explained by A.Vereshagin and V.Vereshagin at this conference) is to perform the numerical testing of those sum rules for hadron resonance parameters which follow from the system of bootstrap constrains. In this talk we discuss the peculiar features of this procedure for the case of exactly solvable bootstrap model based on Veneziano string amplitude. This allows us to simulate different situations that may encounter in realistic EFT models. We also make a short review of the technique that may be useful for further analysis of various bootstrap systems. |
hep-ph/0112286 | Timothy L. Barklow | Timothy L. Barklow (SLAC) | Strong Symmetry Breaking at e+e- Linear Colliders | 7 pages, 2 figures, presented at Snowmass 2001 | eConf C010630 (2001) E3067 | null | SLAC-PUB-9067 | hep-ph | null | The study of strong symmetry breaking at an e+e linear collider with
sqrt(s)=0.5-1.5 TeV is reviewed. It is shown that processes such as e+e- --> nu
nubar W+ W-, e+e- --> nu nubar t tbar, and and e+e- --> W+ W- can be used to
measure chiral Lagrangian and strong resonance parameters. The linear collider
results are compared with those expected from the LHC.
| [
{
"created": "Fri, 21 Dec 2001 00:21:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barklow",
"Timothy L.",
"",
"SLAC"
]
] | The study of strong symmetry breaking at an e+e linear collider with sqrt(s)=0.5-1.5 TeV is reviewed. It is shown that processes such as e+e- --> nu nubar W+ W-, e+e- --> nu nubar t tbar, and and e+e- --> W+ W- can be used to measure chiral Lagrangian and strong resonance parameters. The linear collider results are compared with those expected from the LHC. |
2111.09328 | Maksim Nekrasov L | M. L. Nekrasov | Resonant mode of elastic scattering of protons at ultra-high energies | 11 pages. The lower bound for the energy of the onset of the resonant
scattering mode is specified | Phys. Rev. D 106, 014028 (2022) | 10.1103/PhysRevD.106.014028 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | An interpretation is given for elastic proton scattering at ultra-high
energies with impact-parameter amplitude exceeding the black disk limit. It is
shown that this scattering mode can arise due to the contribution of an
exceptional intermediate state that unites correlated partons of colliding
protons at ultra-high energies into a single coherent system. The behavior of
the real part of the amplitude in this mode is discussed.
| [
{
"created": "Wed, 17 Nov 2021 19:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2022 17:48:34 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jul 2022 11:28:20 GMT",
"version": "v3"
}
] | 2022-08-04 | [
[
"Nekrasov",
"M. L.",
""
]
] | An interpretation is given for elastic proton scattering at ultra-high energies with impact-parameter amplitude exceeding the black disk limit. It is shown that this scattering mode can arise due to the contribution of an exceptional intermediate state that unites correlated partons of colliding protons at ultra-high energies into a single coherent system. The behavior of the real part of the amplitude in this mode is discussed. |
hep-ph/0202222 | Mahiko Suzuki | M. Suzuki | Helicity conservation and factorization-suppressed charmless B decays | The version to appear in Phys. Rev. D after minor alterations | Phys.Rev.D65:097501,2002 | 10.1103/PhysRevD.65.097501 | LBNL-49672/UCB-PTH-02/09 | hep-ph | null | Toward the goal of extracting the weak angle alpha, the decay B^0/B^0-bar to
a_0^{+/-}pi^{-/+} was recently measured. The decay B^0 to a_0^+pi^- is not only
forbidden in the factorization limit of the tree interaction, but also strongly
suppressed for the penguin interaction if short-distance QCD dominates. This
makes extraction of alpha very difficult from a^{+/-}\pi^{-/+}. We examine the
simlar factorization-suppressed decays, in particular, B^0\to b_1^+pi^-. The
prospect of obtaining alpha is even less promising with b_1^{+/-}pi^{-/+}. To
probe how well the short-distance dominance works, we emphasize importance of
testing helicity conservation in the charmless B decays with spins.
| [
{
"created": "Sat, 23 Feb 2002 19:03:33 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2002 20:17:45 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Suzuki",
"M.",
""
]
] | Toward the goal of extracting the weak angle alpha, the decay B^0/B^0-bar to a_0^{+/-}pi^{-/+} was recently measured. The decay B^0 to a_0^+pi^- is not only forbidden in the factorization limit of the tree interaction, but also strongly suppressed for the penguin interaction if short-distance QCD dominates. This makes extraction of alpha very difficult from a^{+/-}\pi^{-/+}. We examine the simlar factorization-suppressed decays, in particular, B^0\to b_1^+pi^-. The prospect of obtaining alpha is even less promising with b_1^{+/-}pi^{-/+}. To probe how well the short-distance dominance works, we emphasize importance of testing helicity conservation in the charmless B decays with spins. |
hep-ph/0309141 | Abel Miranda Dr | A. Miranda | The quark vacuum | 20 pages, 10 figures | null | null | null | hep-ph | null | We conjecture on the structure of the quark vacuum from a viewpoint somewhat
different from, but perhaps supplementary to, standard philosophies. Using a
rather simple dynamical Hamiltonian model, vacuum excitations carrying
helicities 0 and +/-1 are discussed in connection with the dynamical stability
of solutions. We speculate on how the rest masses of the light mesons pi^0,
eta^0 and eta'^0 could be related to these excitations.
| [
{
"created": "Fri, 12 Sep 2003 11:50:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Miranda",
"A.",
""
]
] | We conjecture on the structure of the quark vacuum from a viewpoint somewhat different from, but perhaps supplementary to, standard philosophies. Using a rather simple dynamical Hamiltonian model, vacuum excitations carrying helicities 0 and +/-1 are discussed in connection with the dynamical stability of solutions. We speculate on how the rest masses of the light mesons pi^0, eta^0 and eta'^0 could be related to these excitations. |
2107.05495 | Francisco J. de Anda | Alfredo Aranda, Francisco J. de Anda, Ant\'onio P. Morais, Roman
Pasechnik | Sculpting the Standard Model from low-scale Gauge-Higgs-Matter $E_8$
Grand Unification in ten dimensions | 56 pages, 6 figures. v2: changed the orbifold | Nucl.Phys.B 993 (2023) 116266 | 10.1016/j.nuclphysb.2023.116266 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The construction and general implications of a model with complete
supersymmetric unification of the Standard Model matter content, interactions
and families' replication into a single $E_{8}$ gauge superfield in ten
dimensions is presented. The gauge and extended Poincar\'e symmetries are
broken through compactification of the $\mathbb{T}^6/(\mathbb{Z}_3\times
\mathbb{Z}_3)$ orbifold with Wilson lines, which reduces the original symmetry
and matter content into those of the Standard Model plus additional heavier
states. Proton decay can be suppressed automatically while the compactification
scale may be as low as $10^9~\rm{GeV}$, so that the corresponding GUT-scale
physics may be potentially accessible and testable by future collider
measurements.
| [
{
"created": "Mon, 12 Jul 2021 15:27:59 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2022 22:57:03 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Aranda",
"Alfredo",
""
],
[
"de Anda",
"Francisco J.",
""
],
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
]
] | The construction and general implications of a model with complete supersymmetric unification of the Standard Model matter content, interactions and families' replication into a single $E_{8}$ gauge superfield in ten dimensions is presented. The gauge and extended Poincar\'e symmetries are broken through compactification of the $\mathbb{T}^6/(\mathbb{Z}_3\times \mathbb{Z}_3)$ orbifold with Wilson lines, which reduces the original symmetry and matter content into those of the Standard Model plus additional heavier states. Proton decay can be suppressed automatically while the compactification scale may be as low as $10^9~\rm{GeV}$, so that the corresponding GUT-scale physics may be potentially accessible and testable by future collider measurements. |
hep-ph/0007297 | Burkert | Volker D. Burkert (Jefferson Lab) (for the CLAS collaboration) | Probing the Structure of Nucleons in the Resonance Region with CLAS at
Jefferson Lab | Talk presented at Few Body Problems in Physics, Taipei, March 6-10,
2000, 10 pages, 8 figures | Nucl.Phys.A684:16-25,2001 | 10.1016/S0375-9474(01)00482-1 | JLAB-PHY-00-10 | hep-ph | null | The physics of electromagnetic excitation of nucleon resonances and of their
relevance in nucleon structure studies are discussed. Preliminary data from the
CLAS detector on the N-Delta(1232) transition multipoles, the helicity
amplitudes of the N*(1535), and the search for so-called "missing resonances"
at Jefferson Lab are presented.
| [
{
"created": "Wed, 26 Jul 2000 16:33:19 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Burkert",
"Volker D.",
"",
"Jefferson Lab"
]
] | The physics of electromagnetic excitation of nucleon resonances and of their relevance in nucleon structure studies are discussed. Preliminary data from the CLAS detector on the N-Delta(1232) transition multipoles, the helicity amplitudes of the N*(1535), and the search for so-called "missing resonances" at Jefferson Lab are presented. |
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