id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0608221 | J. P. Ma | J.P. Ma and Z.G. Si | NRQCD Factorization for Twist-2 Light-Cone Wave-Functions of Charmonia | 9 pages, 3 figures | Phys.Lett.B647:419-426,2007 | 10.1016/j.physletb.2007.02.040 | null | hep-ph | null | We show that the twist-2 light-cone wave-functions of eta_c and J/\psi can be
factorized with nonrelativistic QCD(NRQCD) at one-loop level, where the
nonperturbative effects are represented by NRQCD matrix elements. The
factorization is achieved by expanding the small velocity v, which the c- or
\bar c- quark moves inside a rest quarkonium with. At leading order of v the
twist-2 light-cone wave-functions of eta_c and J/\psi can be factorized as the
product of a perturbative function and a NRQCD matrix element. The perturbative
function is calculated at one-loop level and free from any soft divergence. Our
results can be used for the production of J/\psi\eta_c through e^+e^-
-annihilation and of a charmonium in B-decays, which are studied in experiment
of two B-factories.
| [
{
"created": "Sun, 20 Aug 2006 02:18:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ma",
"J. P.",
""
],
[
"Si",
"Z. G.",
""
]
] | We show that the twist-2 light-cone wave-functions of eta_c and J/\psi can be factorized with nonrelativistic QCD(NRQCD) at one-loop level, where the nonperturbative effects are represented by NRQCD matrix elements. The factorization is achieved by expanding the small velocity v, which the c- or \bar c- quark moves inside a rest quarkonium with. At leading order of v the twist-2 light-cone wave-functions of eta_c and J/\psi can be factorized as the product of a perturbative function and a NRQCD matrix element. The perturbative function is calculated at one-loop level and free from any soft divergence. Our results can be used for the production of J/\psi\eta_c through e^+e^- -annihilation and of a charmonium in B-decays, which are studied in experiment of two B-factories. |
2407.09363 | Arnd Behring | Konstantin Asteriadis, Arnd Behring, Kirill Melnikov, Ivan Novikov,
Raoul R\"ontsch | QCD corrections to Higgs boson production and $H \to b \bar{b}$ decay in
weak boson fusion | 12 pages, 4 figures | null | null | TTP24-019, P3H-24-040, CERN-TH-2024-095, TIF-UNIMI-2024-5 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study QCD corrections to the process where a Higgs boson is produced in
weak boson fusion and then decays into a pair of massive $b$ quarks. We find
that typical experimental criteria used to identify $b$ jets in this process
affect QCD corrections to the decay, making it necessary to account for them in
the proper description of this process. Indeed, if corrections to the
production and decay are combined, the fiducial cross section of the weak boson
fusion process $p p \to H(\to b \bar{b}) j j$ is reduced by about $40\%$
relative to leading-order predictions, compared to just about $8\%$ if only
corrections to the production process are considered. We investigate the origin
of these large corrections through next-to-next-to-leading-order and conclude
that they appear because a number of independent moderately-large effects
conspire to significantly reduce the fiducial cross section for this process.
| [
{
"created": "Fri, 12 Jul 2024 15:43:26 GMT",
"version": "v1"
}
] | 2024-07-15 | [
[
"Asteriadis",
"Konstantin",
""
],
[
"Behring",
"Arnd",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Novikov",
"Ivan",
""
],
[
"Röntsch",
"Raoul",
""
]
] | We study QCD corrections to the process where a Higgs boson is produced in weak boson fusion and then decays into a pair of massive $b$ quarks. We find that typical experimental criteria used to identify $b$ jets in this process affect QCD corrections to the decay, making it necessary to account for them in the proper description of this process. Indeed, if corrections to the production and decay are combined, the fiducial cross section of the weak boson fusion process $p p \to H(\to b \bar{b}) j j$ is reduced by about $40\%$ relative to leading-order predictions, compared to just about $8\%$ if only corrections to the production process are considered. We investigate the origin of these large corrections through next-to-next-to-leading-order and conclude that they appear because a number of independent moderately-large effects conspire to significantly reduce the fiducial cross section for this process. |
2401.13043 | Saeed Ansarifard | Saeed Ansarifard and Yasaman Farzan | Jovian Signal at BOREXINO | The analysis and model are extended. Bounds are discussed. Results
have not changed | null | null | null | hep-ph astro-ph.EP astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | The BOREXINO experiment has been collecting solar neutrino data since 2007,
providing the opportunity to study the variation of the event rate over a
decade. We find that at 96 \% C.L., the rate of low energy events shows a time
modulation favoring a correlation with a flux from Jupiter. We present a new
physics model, the Jovian Whisper Model, based on dark matter of mass $\sim
0.1-4$ GeV captured by Jupiter that can account for such modulation. We discuss
how the Jovian Whisper Model (JWM) can be tested.
| [
{
"created": "Tue, 23 Jan 2024 19:01:18 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2024 09:17:25 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Aug 2024 20:31:33 GMT",
"version": "v3"
}
] | 2024-08-12 | [
[
"Ansarifard",
"Saeed",
""
],
[
"Farzan",
"Yasaman",
""
]
] | The BOREXINO experiment has been collecting solar neutrino data since 2007, providing the opportunity to study the variation of the event rate over a decade. We find that at 96 \% C.L., the rate of low energy events shows a time modulation favoring a correlation with a flux from Jupiter. We present a new physics model, the Jovian Whisper Model, based on dark matter of mass $\sim 0.1-4$ GeV captured by Jupiter that can account for such modulation. We discuss how the Jovian Whisper Model (JWM) can be tested. |
1209.1712 | Michael Sarrazin | Michael Sarrazin, Fabrice Petit | Exciton swapping in a twisted graphene bilayer as a solid-state
realization of a two-brane model | 15 pages, 3 figures, final version published in European Physical
Journal B | Eur. Phys. J. B 87 (2014) 26 | 10.1140/epjb/e2013-40492-5 | null | hep-ph cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that exciton swapping between two graphene sheets may occur under
specific conditions. A magnetically tunable optical filter is described to
demonstrate this new effect. Mathematically, it is shown that two turbostratic
graphene layers can be described as a "noncommutative" two-sheeted
(2+1)-spacetime thanks to a formalism previously introduced for the study of
braneworlds in high energy physics. The Hamiltonian of the model contains a
coupling term connecting the two layers which is similar to the coupling
existing between two braneworlds at a quantum level. In the present case, this
term is related to a K-K' intervalley coupling. In addition, the experimental
observation of this effect could be a way to assess the relevance of some
theoretical concepts of the braneworld hypothesis.
| [
{
"created": "Sat, 8 Sep 2012 12:33:08 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Nov 2012 13:55:53 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Dec 2013 15:54:02 GMT",
"version": "v3"
}
] | 2014-02-06 | [
[
"Sarrazin",
"Michael",
""
],
[
"Petit",
"Fabrice",
""
]
] | It is shown that exciton swapping between two graphene sheets may occur under specific conditions. A magnetically tunable optical filter is described to demonstrate this new effect. Mathematically, it is shown that two turbostratic graphene layers can be described as a "noncommutative" two-sheeted (2+1)-spacetime thanks to a formalism previously introduced for the study of braneworlds in high energy physics. The Hamiltonian of the model contains a coupling term connecting the two layers which is similar to the coupling existing between two braneworlds at a quantum level. In the present case, this term is related to a K-K' intervalley coupling. In addition, the experimental observation of this effect could be a way to assess the relevance of some theoretical concepts of the braneworld hypothesis. |
hep-ph/9308289 | null | C.S. Lam | Spinor Helicity Technique and String Reorganization for Multiloop
Diagrams | 41 pages in Plain Tex, plus 6 pages of (fourteen) figures in a
postcript file attached to the end of the Tex file; McGill/93-20 | Can.J.Phys.72:415-438,1994 | 10.1139/p94-058 | null | hep-ph hep-th | null | Methods to apply the spinor helicity technique and string reorganization to
multiloop amplitudes using the Feynman- and Schwinger-parameter representations
are reviewed and expanded.
| [
{
"created": "Wed, 18 Aug 1993 13:08:05 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Lam",
"C. S.",
""
]
] | Methods to apply the spinor helicity technique and string reorganization to multiloop amplitudes using the Feynman- and Schwinger-parameter representations are reviewed and expanded. |
1706.09401 | Zhi-Gang Wang | Zhi-Gang Wang, Xing-Ning Wei, Ze-Hui Yan | Revisit assignments of the new excited $\Omega_c$ states with QCD sum
rules | 19 pages, 22 figures. arXiv admin note: text overlap with
arXiv:1705.07745 | Eur. Phys. J. C77 (2017) 832 | 10.1140/epjc/s10052-017-5409-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we distinguish the contributions of the positive parity and
negative parity $\Omega_c$ states, study the masses and pole residues of the
1S, 1P, 2S and 2P $\Omega_c$ states with the spin $J=\frac{1}{2}$ and
$\frac{3}{2}$ using the QCD sum rules in a consistent way, and revisit the
assignments of the new narrow excited $\Omega_c^0$ states. The predictions
support assigning the $\Omega_c(3000)$ to be the 1P $\Omega_c$ state with
$J^P={\frac{1}{2}}^-$, assigning the $\Omega_c(3090)$ to be the 1P $\Omega_c$
state with $J^P={\frac{3}{2}}^-$ or the 2S $\Omega_c$ state with
$J^P={\frac{1}{2}}^+$, and assigning $\Omega_c(3119)$ to be the 2S $\Omega_c$
state with $J^P={\frac{3}{2}}^+$.
| [
{
"created": "Wed, 28 Jun 2017 07:41:15 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2017 13:16:18 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Oct 2017 02:55:31 GMT",
"version": "v3"
},
{
"created": "Wed, 1 Nov 2017 09:57:28 GMT",
"version": "v4"
}
] | 2017-12-11 | [
[
"Wang",
"Zhi-Gang",
""
],
[
"Wei",
"Xing-Ning",
""
],
[
"Yan",
"Ze-Hui",
""
]
] | In this article, we distinguish the contributions of the positive parity and negative parity $\Omega_c$ states, study the masses and pole residues of the 1S, 1P, 2S and 2P $\Omega_c$ states with the spin $J=\frac{1}{2}$ and $\frac{3}{2}$ using the QCD sum rules in a consistent way, and revisit the assignments of the new narrow excited $\Omega_c^0$ states. The predictions support assigning the $\Omega_c(3000)$ to be the 1P $\Omega_c$ state with $J^P={\frac{1}{2}}^-$, assigning the $\Omega_c(3090)$ to be the 1P $\Omega_c$ state with $J^P={\frac{3}{2}}^-$ or the 2S $\Omega_c$ state with $J^P={\frac{1}{2}}^+$, and assigning $\Omega_c(3119)$ to be the 2S $\Omega_c$ state with $J^P={\frac{3}{2}}^+$. |
hep-ph/0004185 | Tran. Truong | Tran N. Truong | Reinterpretation of Effective Chiral Lagrangian | 10 pages, 1 figure | null | null | CPHT S 040.0400 | hep-ph | null | Effective tree Chiral Lagrangian is interpreted as a power series expansion
of the kinematical variables. In the presence of the strong interaction this
expansion is valid below the unitarity cut, hence in the unphysical region.
Consequences of this reinterpretation of the Chiral Lagrangian are analysed
for the relation between K-pi and K-pipi transitions.
| [
{
"created": "Wed, 19 Apr 2000 16:33:21 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Truong",
"Tran N.",
""
]
] | Effective tree Chiral Lagrangian is interpreted as a power series expansion of the kinematical variables. In the presence of the strong interaction this expansion is valid below the unitarity cut, hence in the unphysical region. Consequences of this reinterpretation of the Chiral Lagrangian are analysed for the relation between K-pi and K-pipi transitions. |
2005.01543 | Michael Andreas Schmidt | Tong Li, Xiao-Dong Ma, Michael A. Schmidt | General neutrino interactions with sterile neutrinos in light of
coherent neutrino-nucleus scattering and meson invisible decays | v2: 34 pages, 2 figures, 9 tables; discussion about UV completions
and comparison to some other constraints added; version published in JHEP | JHEP07 (2020) 152 | 10.1007/JHEP07(2020)152 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the current bounds from the CE{\nu}NS process and meson
invisible decays on generic neutrino interactions with sterile neutrinos in
effective field theories. The interactions between quarks and left-handed SM
neutrinos and/or right-handed neutrinos are first described by the low-energy
effective field theory (LNEFT) between the electroweak scale and the chiral
symmetry breaking scale. We complete the independent operator basis for the
LNEFT up to dimension-6 by including both the lepton-number-conserving (LNC)
and lepton-number-violating (LNV) operators involving right-handed neutrinos.
We translate the bounds on the LNEFT Wilson coefficients from the COHERENT
observation and calculate the branching fractions of light meson invisible
decays. The bounds on LNEFT are then mapped onto the SM effective field theory
with sterile neutrinos (SMNEFT) to constrain new physics above the electroweak
scale. We find that the meson invisible decays can provide the only sensitive
probe for {\tau} neutrino flavor component and s quark component in the
quark-neutrino interactions involving two (one) active neutrinos and for the
effective operators without any active neutrino fields. The CE{\nu}NS process
places the most stringent bound on all other Wilson coefficients. By assuming
one dominant Wilson coefficient at a time in SMNEFT and negligible sterile
neutrino mass, the most stringent limits on the new physics scale are 2.7 - 10
TeV from corresponding dipole operator in LNEFT and 0.5 - 1.5 TeV from
neutrino-quark operator in LNEFT.
| [
{
"created": "Mon, 4 May 2020 14:55:34 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 2020 12:18:18 GMT",
"version": "v2"
}
] | 2020-07-29 | [
[
"Li",
"Tong",
""
],
[
"Ma",
"Xiao-Dong",
""
],
[
"Schmidt",
"Michael A.",
""
]
] | In this work we study the current bounds from the CE{\nu}NS process and meson invisible decays on generic neutrino interactions with sterile neutrinos in effective field theories. The interactions between quarks and left-handed SM neutrinos and/or right-handed neutrinos are first described by the low-energy effective field theory (LNEFT) between the electroweak scale and the chiral symmetry breaking scale. We complete the independent operator basis for the LNEFT up to dimension-6 by including both the lepton-number-conserving (LNC) and lepton-number-violating (LNV) operators involving right-handed neutrinos. We translate the bounds on the LNEFT Wilson coefficients from the COHERENT observation and calculate the branching fractions of light meson invisible decays. The bounds on LNEFT are then mapped onto the SM effective field theory with sterile neutrinos (SMNEFT) to constrain new physics above the electroweak scale. We find that the meson invisible decays can provide the only sensitive probe for {\tau} neutrino flavor component and s quark component in the quark-neutrino interactions involving two (one) active neutrinos and for the effective operators without any active neutrino fields. The CE{\nu}NS process places the most stringent bound on all other Wilson coefficients. By assuming one dominant Wilson coefficient at a time in SMNEFT and negligible sterile neutrino mass, the most stringent limits on the new physics scale are 2.7 - 10 TeV from corresponding dipole operator in LNEFT and 0.5 - 1.5 TeV from neutrino-quark operator in LNEFT. |
hep-ph/9709483 | Robert Foot | R. Foot, R. R. Volkas and O. Yasuda | Testing maximal electron and muon neutrino oscillations with sub-GeV
SuperKamiokande atmospheric neutrino data | LaTeX, 8 figures, 17 pages, version to appear in Phys. Rev. D Rapid
Communications | Phys.Rev.D57:1345-1349,1998 | 10.1103/PhysRevD.57.R1345 | TMUP-HEL-97/07 | hep-ph | null | Motivated by the Exact Parity Model and other theories, the hypothesis that
each of the known neutrinos oscillates maximally with a sterile partner has
been put forward as an explanation of the atmospheric and solar neutrino
anomalies. We provide detailed predictions for muon and electron flux ratios
induced in the Kamiokande and SuperKamiokande detectors by sub-GeV atmospheric
neutrinos. Several different, carefully chosen cuts on momentum and zenith
angle are proposed, emphasizing the role of up-down flux asymmetries.
| [
{
"created": "Mon, 29 Sep 1997 06:01:16 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 1997 02:52:00 GMT",
"version": "v2"
}
] | 2011-03-10 | [
[
"Foot",
"R.",
""
],
[
"Volkas",
"R. R.",
""
],
[
"Yasuda",
"O.",
""
]
] | Motivated by the Exact Parity Model and other theories, the hypothesis that each of the known neutrinos oscillates maximally with a sterile partner has been put forward as an explanation of the atmospheric and solar neutrino anomalies. We provide detailed predictions for muon and electron flux ratios induced in the Kamiokande and SuperKamiokande detectors by sub-GeV atmospheric neutrinos. Several different, carefully chosen cuts on momentum and zenith angle are proposed, emphasizing the role of up-down flux asymmetries. |
hep-ph/9608408 | Marco Stratmann | M. Stratmann (Univ. Dortmund), W. Vogelsang (Rutherford) | Photoproduction of Jets and Heavy Flavors in Polarized ep - Collisions
at HERA | 12 pages, LaTeX, 6 figures, uses amssymb and epsfig styles;
Contribution to the proc. of the workshop on 'Future Physics at HERA', DESY,
Hamburg, 1995/96 | null | null | DO-TH 96/14, RAL-TR-96-061 | hep-ph | null | We study photoproduction of jets and heavy flavors in a polarized collider
mode of HERA at $\sqrt{S}= 298$ GeV. We examine the sensitivity of the cross
sections and their asymmetries to the proton's polarized gluon distribution and
to the completely unknown parton distributions of longitudinally polarized
photons.
| [
{
"created": "Thu, 22 Aug 1996 11:18:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stratmann",
"M.",
"",
"Univ. Dortmund"
],
[
"Vogelsang",
"W.",
"",
"Rutherford"
]
] | We study photoproduction of jets and heavy flavors in a polarized collider mode of HERA at $\sqrt{S}= 298$ GeV. We examine the sensitivity of the cross sections and their asymmetries to the proton's polarized gluon distribution and to the completely unknown parton distributions of longitudinally polarized photons. |
hep-ph/9407235 | Oleg Tarasov | J. Fleischer and O.V. Tarasov | Application of conformal mapping and Pad\'{e} approximants $(\omega
P's)$ to the calculation of various two-loop Feynman diagrams | 5 pages, University of Bielefeld preprint BI-TP-94/35, To appear in
Nucl.Phys.B (Proceedings Supplements) | Nucl.Phys.Proc.Suppl. 37B (1994) 115-119 | 10.1016/0920-5632(94)90666-1 | null | hep-ph | null | Feynman diagrams are calculated by means of their Taylor series expansion in
terms of external momenta squared. It is demonstrated in various examples that
by the application of conformal mapping and Pad\'{e} approximants, it is
possible to obtain high precision results in the spacelike as well as in the
timelike region on the cut. Examples are given for two- and three-point
functions, but in principle the method is applicable also to four-point
functions.
| [
{
"created": "Wed, 6 Jul 1994 08:09:45 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Fleischer",
"J.",
""
],
[
"Tarasov",
"O. V.",
""
]
] | Feynman diagrams are calculated by means of their Taylor series expansion in terms of external momenta squared. It is demonstrated in various examples that by the application of conformal mapping and Pad\'{e} approximants, it is possible to obtain high precision results in the spacelike as well as in the timelike region on the cut. Examples are given for two- and three-point functions, but in principle the method is applicable also to four-point functions. |
hep-ph/0612274 | Jan Fischer | Irinel Caprini and Jan Fischer | Infrared freezing of Euclidean observables and analyticity in
perturbative QCD | 13 pages, no figures | null | null | null | hep-ph | null | The renormalization-group improved finite order expansions of the QCD
observables have an unphysical singularity in the Euclidean region, due to the
Landau pole of the running coupling. Recently it was claimed that, by using a
modified Borel representation, the leading one-chain term in a skeleton
expansion of the Euclidean QCD observables is finite and continuous across the
Landau pole, and then exhibits an infrared freezing behaviour, vanishing at
$Q^2=0$. In the present paper we show, using for illustration the Adler-${\cal
D}$ function, that the above Borel prescription violates the causality
properties expressed by energy-plane analyticity: the function ${\cal D}(Q^2)$
thus defined is the boundary value of a piecewise analytic function in the
complex plane, instead of being a standard analytic function. So, the price to
be paid for the infrared freezing of Euclidean QCD observables is the loss of a
fundamental property of local quantum field theory.
| [
{
"created": "Thu, 21 Dec 2006 10:46:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Caprini",
"Irinel",
""
],
[
"Fischer",
"Jan",
""
]
] | The renormalization-group improved finite order expansions of the QCD observables have an unphysical singularity in the Euclidean region, due to the Landau pole of the running coupling. Recently it was claimed that, by using a modified Borel representation, the leading one-chain term in a skeleton expansion of the Euclidean QCD observables is finite and continuous across the Landau pole, and then exhibits an infrared freezing behaviour, vanishing at $Q^2=0$. In the present paper we show, using for illustration the Adler-${\cal D}$ function, that the above Borel prescription violates the causality properties expressed by energy-plane analyticity: the function ${\cal D}(Q^2)$ thus defined is the boundary value of a piecewise analytic function in the complex plane, instead of being a standard analytic function. So, the price to be paid for the infrared freezing of Euclidean QCD observables is the loss of a fundamental property of local quantum field theory. |
1210.4095 | Valery Yundin | Jochem Fleischer, Tord Riemann, Valery Yundin | New developments in PJFry | 8 pages, talk given at Loops and Legs in Quantum Field Theory 2012,
April 15-20, Wernigerode | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We report on recent progress in numerical evaluation of one loop tensor
integrals. A public C++ package PJFry implementing algorithms from
arXiv:1009.4436 and its extension to hexagons up to rank 6 are presented.
| [
{
"created": "Mon, 15 Oct 2012 16:29:29 GMT",
"version": "v1"
}
] | 2012-10-16 | [
[
"Fleischer",
"Jochem",
""
],
[
"Riemann",
"Tord",
""
],
[
"Yundin",
"Valery",
""
]
] | We report on recent progress in numerical evaluation of one loop tensor integrals. A public C++ package PJFry implementing algorithms from arXiv:1009.4436 and its extension to hexagons up to rank 6 are presented. |
hep-ph/9706491 | null | Anatoly D. Adamov and Gary R. Goldstein (Tufts University) | Fragmentation Functions For Baryons in a Quark-Diquark Model | 18 pages Latex2e and 8 PostScript figures. Uses revtex.sty,
revtex.cls, aps.sty, aps12.sty, prabib.sty. Submitted to Phys. Rev.D | Phys.Rev. D56 (1997) 7381-7391 | 10.1103/PhysRevD.56.7381 | TUFTS TH-97-G01 | hep-ph | null | A perturbative QCD calculation of heavy flavor quark fragmentation into heavy
flavor baryons is developed along the lines of corresponding heavy meson
models. The non-perturbative formation of the baryon is accomplished by
implementing the quark-diquark model of the baryons. Diquark color form factors
are used to enable the integration over the virtual heavy quark momentum. The
resulting spin independent functions for charmed and bottom quarks to fragment
into charmed and bottom baryons with spin 1/2 and 3/2 are compared with recent
data. Predictions are made for the spin dependent fragmentation functions as
well, particularly for the functions $\hat{g}_1$ and $\hat{h}_1$ in the case of
spin 1/2 baryons.
| [
{
"created": "Tue, 24 Jun 1997 20:02:04 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Adamov",
"Anatoly D.",
"",
"Tufts University"
],
[
"Goldstein",
"Gary R.",
"",
"Tufts University"
]
] | A perturbative QCD calculation of heavy flavor quark fragmentation into heavy flavor baryons is developed along the lines of corresponding heavy meson models. The non-perturbative formation of the baryon is accomplished by implementing the quark-diquark model of the baryons. Diquark color form factors are used to enable the integration over the virtual heavy quark momentum. The resulting spin independent functions for charmed and bottom quarks to fragment into charmed and bottom baryons with spin 1/2 and 3/2 are compared with recent data. Predictions are made for the spin dependent fragmentation functions as well, particularly for the functions $\hat{g}_1$ and $\hat{h}_1$ in the case of spin 1/2 baryons. |
1701.08574 | Paulo Beggio Cesar | P.C. Beggio | Inelastic cross sections, overlap functions and Cq moments from ISR to
LHC energies in proton interactions | 6 figures, Journal of Physics G: Nuclear and Particle Physics, 2017 | null | 10.1088/1361-6471/aa51f5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated the energy dependence of the parton-parton inelastic cross
sections, parton- parton inelastic overlap functions and the Cq moments in
proton interactions from 10 to 14000 GeV. The used approach is based on a
phenomenological procedure where elastic and inelastic proton observables are
described in a connected way by exploring the unitarity of S- Matrix. Applying
a Quantum Chromodynamics inspired eikonal model, that contains contributions of
the quark-quark, quark-gluon and gluon-gluon interactions, theoretical
predictions on inelastic cross sections and Cq moments are compared with
measurements showing successfully description of the experimental data. The KNO
hypothesis violation is discussed as a consequence of the semihard contribution
to the multiparticle production in the interactions, in accordance to several
experimental and theoretical previous results. Prediction to the ratio elastic
to total cross sections as a function of the collision energy is presented and
also compared with the experimental information.
| [
{
"created": "Mon, 30 Jan 2017 13:00:07 GMT",
"version": "v1"
}
] | 2017-01-31 | [
[
"Beggio",
"P. C.",
""
]
] | We investigated the energy dependence of the parton-parton inelastic cross sections, parton- parton inelastic overlap functions and the Cq moments in proton interactions from 10 to 14000 GeV. The used approach is based on a phenomenological procedure where elastic and inelastic proton observables are described in a connected way by exploring the unitarity of S- Matrix. Applying a Quantum Chromodynamics inspired eikonal model, that contains contributions of the quark-quark, quark-gluon and gluon-gluon interactions, theoretical predictions on inelastic cross sections and Cq moments are compared with measurements showing successfully description of the experimental data. The KNO hypothesis violation is discussed as a consequence of the semihard contribution to the multiparticle production in the interactions, in accordance to several experimental and theoretical previous results. Prediction to the ratio elastic to total cross sections as a function of the collision energy is presented and also compared with the experimental information. |
2406.18635 | Riku Mizuta | David McKeen, Riku Mizuta, David E. Morrissey, Michael Shamma | Dark Matter from Dark Glueball Dominance | 26 pages, 7 figures | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | New gauge forces can play an important role in the evolution of the early
universe. In this work we investigate the cosmological implications of a pure
Yang-Mills dark sector that is dominantly populated after primordial inflation.
Such a dark sector takes the form of a bath of dark gluons at high
temperatures, but confines at lower temperatures to produce a spectrum of dark
glueballs. These glueballs then undergo a freezeout process such that the
remnant population is nearly completely dominated by the lightest state. To
reproduce the observed cosmology, this lightest glueball species must decay to
the Standard Model to repopulate and reheat it. At leading order, this can
occur through a connector operator of dimension-6. In contrast, other glueballs
can be parametrically long-lived or stable, and remain as contributors to dark
matter or modify the observed cosmology through their later decays. In this
work we study the evolution of such dark sectors in detail. We demonstrate that
stable remnant glueballs can produce the measured dark matter abundance. We
also derive broad constraints on non-Abelian dark sectors from overproduction
of remnant glueballs when they are stable or from their destructive impact when
they are able to decay.
| [
{
"created": "Wed, 26 Jun 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-06-28 | [
[
"McKeen",
"David",
""
],
[
"Mizuta",
"Riku",
""
],
[
"Morrissey",
"David E.",
""
],
[
"Shamma",
"Michael",
""
]
] | New gauge forces can play an important role in the evolution of the early universe. In this work we investigate the cosmological implications of a pure Yang-Mills dark sector that is dominantly populated after primordial inflation. Such a dark sector takes the form of a bath of dark gluons at high temperatures, but confines at lower temperatures to produce a spectrum of dark glueballs. These glueballs then undergo a freezeout process such that the remnant population is nearly completely dominated by the lightest state. To reproduce the observed cosmology, this lightest glueball species must decay to the Standard Model to repopulate and reheat it. At leading order, this can occur through a connector operator of dimension-6. In contrast, other glueballs can be parametrically long-lived or stable, and remain as contributors to dark matter or modify the observed cosmology through their later decays. In this work we study the evolution of such dark sectors in detail. We demonstrate that stable remnant glueballs can produce the measured dark matter abundance. We also derive broad constraints on non-Abelian dark sectors from overproduction of remnant glueballs when they are stable or from their destructive impact when they are able to decay. |
0708.0119 | Javier Virto | Rafel Escribano, Joaquim Matias, Javier Virto (Barcelona, IFAE) | Sum rules for B-->pi eta('), K eta('), eta(') eta(') decays | 18 pages, 4 figures. Version published in PLB | Phys.Lett.B659:870-877,2008 | 10.1016/j.physletb.2007.12.023 | UAB-FT-634 | hep-ph | null | We provide a set of sum rules, using flavour symmetries, relating CP-averaged
ratios and CP asymmetries of different neutral and charged B mesons decaying
into an eta(') particle together with a pion, a kaon or a second eta('). These
sume rules allow us to give a prediction for the B^0-->K^0 eta branching ratio.
We also predict a clear sign anti-correlation between the two B^0-->pi^0
(eta,eta') CP-asymmetries, and find a combined constraint on the branching
ratios and CP-asymmetries of the three B-->eta(')eta(') decay modes.
| [
{
"created": "Wed, 1 Aug 2007 10:47:25 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2008 11:25:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Escribano",
"Rafel",
"",
"Barcelona, IFAE"
],
[
"Matias",
"Joaquim",
"",
"Barcelona, IFAE"
],
[
"Virto",
"Javier",
"",
"Barcelona, IFAE"
]
] | We provide a set of sum rules, using flavour symmetries, relating CP-averaged ratios and CP asymmetries of different neutral and charged B mesons decaying into an eta(') particle together with a pion, a kaon or a second eta('). These sume rules allow us to give a prediction for the B^0-->K^0 eta branching ratio. We also predict a clear sign anti-correlation between the two B^0-->pi^0 (eta,eta') CP-asymmetries, and find a combined constraint on the branching ratios and CP-asymmetries of the three B-->eta(')eta(') decay modes. |
2404.05491 | German Rodrigo | Selomit Ram\'irez-Uribe, Prasanna K. Dhani, German F.R. Sborlini and
Germ\'an Rodrigo | Rewording theoretical predictions at colliders with vacuum amplitudes | 8 pages, 3 figures | null | null | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose multiloop vacuum amplitudes as the optimal building blocks for
efficiently assembling theoretical predictions at high-energy colliders. This
hypothesis is strongly supported by the manifestly causal properties of the
loop-tree duality (LTD) representation of a vacuum amplitude. The vacuum
amplitude, acting as a kernel, encodes all the final states contributing to a
given scattering or decay process through residues in the on-shell energies of
the internal propagators. It also naturally implements gauge invariance and the
wave function renormalisation of the external legs. This methodological
approach, dubbed LTD causal unitary, leads to a novel representation of
differential cross sections and decay rates that is locally free of ultraviolet
and infrared singularities at all orders in perturbation theory. Unitary
threshold singularities also match between different phase-space residues. Most
notably, it allows us to conjecture for the first time the local functional
form of initial-state collinear singularities. The fulfillment of all these
properties provides a theoretical description of differential observables at
colliders that is well defined in the four physical dimensions of the
space-time.
| [
{
"created": "Mon, 8 Apr 2024 13:12:04 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Ramírez-Uribe",
"Selomit",
""
],
[
"Dhani",
"Prasanna K.",
""
],
[
"Sborlini",
"German F. R.",
""
],
[
"Rodrigo",
"Germán",
""
]
] | We propose multiloop vacuum amplitudes as the optimal building blocks for efficiently assembling theoretical predictions at high-energy colliders. This hypothesis is strongly supported by the manifestly causal properties of the loop-tree duality (LTD) representation of a vacuum amplitude. The vacuum amplitude, acting as a kernel, encodes all the final states contributing to a given scattering or decay process through residues in the on-shell energies of the internal propagators. It also naturally implements gauge invariance and the wave function renormalisation of the external legs. This methodological approach, dubbed LTD causal unitary, leads to a novel representation of differential cross sections and decay rates that is locally free of ultraviolet and infrared singularities at all orders in perturbation theory. Unitary threshold singularities also match between different phase-space residues. Most notably, it allows us to conjecture for the first time the local functional form of initial-state collinear singularities. The fulfillment of all these properties provides a theoretical description of differential observables at colliders that is well defined in the four physical dimensions of the space-time. |
1912.03245 | Geraldine Servant | Yann Gouttenoire, G\'eraldine Servant, Peera Simakachorn | BSM with Cosmic Strings: Heavy, up to EeV mass, Unstable Particles | 29 pages, 10 figures. v2: Section 4.4 extended on the scenario where
the cosmic string network and the dark photon mass have the same origin.
Version published in JCAP | null | 10.1088/1475-7516/2020/07/016 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Unstable heavy particles well above the TeV scale are unaccessible
experimentally. So far, Big-Bang Nucleosynthesis (BBN) provides the strongest
limits on their mass and lifetime, the latter being shorter than 0.1 second. We
show how these constraints could be potentially tremendously improved by the
next generation of Gravitational-Wave (GW) interferometers, extending to
lifetimes as short as $10^{-16}$ second. The key point is that these particles
may have dominated the energy density of the universe and have triggered a
period of matter domination at early times, until their decay before BBN. The
resulting modified cosmological history compared to the usually-assumed single
radiation era would imprint observable signatures in stochastic
gravitational-wave backgrounds of primordial origin. In particular, we show how
the detection of the GW spectrum produced by long-lasting sources such as
cosmic strings would provide a unique probe of particle physics parameters.
When applied to specific particle production mechanisms in the early universe,
these GW spectra could be used to derive new constraints on many UV extensions
of the Standard Model. We illustrate this on a few examples, such as
supersymmetric models where the mass scale of scalar moduli and gravitino can
be constrained up to $10^{10}$ GeV. Further bounds can be obtained on the
reheating temperature of models with only-gravitationally-interacting particles
as well as on the kinetic mixing of heavy dark photons at the level of
$10^{-18}$.
| [
{
"created": "Fri, 6 Dec 2019 17:35:48 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 2020 10:07:36 GMT",
"version": "v2"
}
] | 2020-07-22 | [
[
"Gouttenoire",
"Yann",
""
],
[
"Servant",
"Géraldine",
""
],
[
"Simakachorn",
"Peera",
""
]
] | Unstable heavy particles well above the TeV scale are unaccessible experimentally. So far, Big-Bang Nucleosynthesis (BBN) provides the strongest limits on their mass and lifetime, the latter being shorter than 0.1 second. We show how these constraints could be potentially tremendously improved by the next generation of Gravitational-Wave (GW) interferometers, extending to lifetimes as short as $10^{-16}$ second. The key point is that these particles may have dominated the energy density of the universe and have triggered a period of matter domination at early times, until their decay before BBN. The resulting modified cosmological history compared to the usually-assumed single radiation era would imprint observable signatures in stochastic gravitational-wave backgrounds of primordial origin. In particular, we show how the detection of the GW spectrum produced by long-lasting sources such as cosmic strings would provide a unique probe of particle physics parameters. When applied to specific particle production mechanisms in the early universe, these GW spectra could be used to derive new constraints on many UV extensions of the Standard Model. We illustrate this on a few examples, such as supersymmetric models where the mass scale of scalar moduli and gravitino can be constrained up to $10^{10}$ GeV. Further bounds can be obtained on the reheating temperature of models with only-gravitationally-interacting particles as well as on the kinetic mixing of heavy dark photons at the level of $10^{-18}$. |
2007.10837 | Leonardo Cosmai | Maurizio Consoli, Leonardo Cosmai | A resonance of the Higgs field at 700 GeV and a new phenomenology | 13 pages, 1 figure, 1 table. Revised version extended to the full
ATLAS statistics | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently proposed that, besides the known resonance with mass
$m_h\sim$ 125 GeV, the Higgs field could exhibit a new excitation with a larger
mass $M_h$ related by $M^2_h\sim m^2_h \ln (\Lambda_s/M_h)$, where $\Lambda_s$
is the ultraviolet cutoff of the scalar sector. Lattice simulations of the
propagator performed in the 4D Ising limit of the theory are consistent with
this two-mass picture and lead to the estimate $M_h\sim 700$ GeV. In spite of
its large mass, however, this heavier state would couple to longitudinal vector
bosons with the same typical strength of the low-mass state and would thus
represent a relatively narrow resonance. In this Letter we argue that this
hypothetical new resonance would naturally fit with some excess of 4-lepton
events which is observed by ATLAS around 680 GeV.
| [
{
"created": "Mon, 20 Jul 2020 09:08:09 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Dec 2020 11:48:23 GMT",
"version": "v2"
}
] | 2020-12-29 | [
[
"Consoli",
"Maurizio",
""
],
[
"Cosmai",
"Leonardo",
""
]
] | It has been recently proposed that, besides the known resonance with mass $m_h\sim$ 125 GeV, the Higgs field could exhibit a new excitation with a larger mass $M_h$ related by $M^2_h\sim m^2_h \ln (\Lambda_s/M_h)$, where $\Lambda_s$ is the ultraviolet cutoff of the scalar sector. Lattice simulations of the propagator performed in the 4D Ising limit of the theory are consistent with this two-mass picture and lead to the estimate $M_h\sim 700$ GeV. In spite of its large mass, however, this heavier state would couple to longitudinal vector bosons with the same typical strength of the low-mass state and would thus represent a relatively narrow resonance. In this Letter we argue that this hypothetical new resonance would naturally fit with some excess of 4-lepton events which is observed by ATLAS around 680 GeV. |
2001.11377 | Goutam Das | Ajjath A. H., Goutam Das, M. C. Kumar, Pooja Mukherjee, V. Ravindran,
Kajal Samanta | Resummed Drell-Yan cross-section at N$^3$LL | 43 pages, 8 figures, 3 tables | null | null | IMSc/2019/12/16, DESY 19-191, SI-HEP-2019-23 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present the resummed predictions for inclusive cross-section for Drell-Yan
(DY) production as well as onshell $Z,W^\pm$ productions at
next-to-next-to-next-to leading logarithmic (N$^{3}$LL) accuracy. Using the
standard techniques, we derive the $N$-dependent coefficients in the Mellin-$N$
space as well as the $N$-independent constants and match the resummed result
through the minimal prescription matching procedure with that of existing
next-to next-to leading order (NNLO). In addition to the standard $\ln N$
exponentiation, we study the numerical impacts of exponentiating
$N$-independent part of the soft function and the complete $\bar{g}_0$ that
appears in the resummed predictions in $N$ space. All the analytical pieces
needed in these different approaches are extracted from the soft-virtual part
of the inclusive cross section known to next-to-next-to-next-to leading order
(N$^3$LO). We perform a detailed analysis on the scale and parton distribution
function (PDF) variations and present predictions for the 13 TeV LHC for the
neutral Drell-Yan process as well as onshell charged and neutral vector boson
productions.
| [
{
"created": "Thu, 30 Jan 2020 15:02:56 GMT",
"version": "v1"
}
] | 2020-01-31 | [
[
"H.",
"Ajjath A.",
""
],
[
"Das",
"Goutam",
""
],
[
"Kumar",
"M. C.",
""
],
[
"Mukherjee",
"Pooja",
""
],
[
"Ravindran",
"V.",
""
],
[
"Samanta",
"Kajal",
""
]
] | We present the resummed predictions for inclusive cross-section for Drell-Yan (DY) production as well as onshell $Z,W^\pm$ productions at next-to-next-to-next-to leading logarithmic (N$^{3}$LL) accuracy. Using the standard techniques, we derive the $N$-dependent coefficients in the Mellin-$N$ space as well as the $N$-independent constants and match the resummed result through the minimal prescription matching procedure with that of existing next-to next-to leading order (NNLO). In addition to the standard $\ln N$ exponentiation, we study the numerical impacts of exponentiating $N$-independent part of the soft function and the complete $\bar{g}_0$ that appears in the resummed predictions in $N$ space. All the analytical pieces needed in these different approaches are extracted from the soft-virtual part of the inclusive cross section known to next-to-next-to-next-to leading order (N$^3$LO). We perform a detailed analysis on the scale and parton distribution function (PDF) variations and present predictions for the 13 TeV LHC for the neutral Drell-Yan process as well as onshell charged and neutral vector boson productions. |
1510.08482 | Barry Dillon | Djuna Croon, Barry M. Dillon, Stephan J. Huber, and Veronica Sanz | Exploring holographic Composite Higgs models | In v.2 we edited the plot in the last section and added some
discussion | null | 10.1007/JHEP07(2016)072 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simple Composite Higgs models predict new vector-like fermions not too far
from the electroweak scale, yet LHC limits are now sensitive to the TeV scale.
Motivated by this tension, we explore the holographic dual of the minimal
model, MCHM5, to understand how far naive 4D predictions are from their 5D
duals. Interestingly, we find that the usual hierarchy among the vector-like
quarks is not generic, hence ameliorating the tuning issue. We find that
lowering the UV cutoff in the 5D picture allows for heavier top partners, while
keeping the mass of the Higgs boson at its observed value. In the 4D dual this
corresponds to increasing the number of colours. This is essentially a Little
Randall-Sundrum Model, which are known to reduce some flavour and electroweak
constraints. Furthermore, in anticipation of the ongoing efforts at the LHC to
put bounds on the top Yukawa, we demonstrate that deviations from the SM can be
suppressed or enhanced with respect to what is expected from mere symmetry
arguments in 4D. We conclude that the 5D holographic realisation of the MCHM5
with a small UV cutoff is not in tension with the current experimental data.
| [
{
"created": "Wed, 28 Oct 2015 20:49:48 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2016 18:20:02 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Croon",
"Djuna",
""
],
[
"Dillon",
"Barry M.",
""
],
[
"Huber",
"Stephan J.",
""
],
[
"Sanz",
"Veronica",
""
]
] | Simple Composite Higgs models predict new vector-like fermions not too far from the electroweak scale, yet LHC limits are now sensitive to the TeV scale. Motivated by this tension, we explore the holographic dual of the minimal model, MCHM5, to understand how far naive 4D predictions are from their 5D duals. Interestingly, we find that the usual hierarchy among the vector-like quarks is not generic, hence ameliorating the tuning issue. We find that lowering the UV cutoff in the 5D picture allows for heavier top partners, while keeping the mass of the Higgs boson at its observed value. In the 4D dual this corresponds to increasing the number of colours. This is essentially a Little Randall-Sundrum Model, which are known to reduce some flavour and electroweak constraints. Furthermore, in anticipation of the ongoing efforts at the LHC to put bounds on the top Yukawa, we demonstrate that deviations from the SM can be suppressed or enhanced with respect to what is expected from mere symmetry arguments in 4D. We conclude that the 5D holographic realisation of the MCHM5 with a small UV cutoff is not in tension with the current experimental data. |
1709.06858 | Manibrata Sen | Amol Dighe, Manibrata Sen (Tata Inst.) | Non-standard neutrino self-interactions in a supernova and fast flavor
conversions | v2: Revised version. 13 pages, Revtex style, 15 figures. Matches
version published in PRD | Phys. Rev. D 97, 043011 (2018) | 10.1103/PhysRevD.97.043011 | TIFR/TH/17-33 | hep-ph astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of non-standard self-interactions (NSSI) of neutrinos
streaming out of a core-collapse supernova. We show that with NSSI, the
standard linear stability analysis gives rise to linearly as well as
exponentially growing solutions. For a two-box spectrum, we demonstrate
analytically that flavor-preserving NSSI lead to a suppression of bipolar
collective oscillations. In the intersecting four-beam model, we show that
flavor-violating NSSI can lead to fast oscillations even when the angle between
the neutrino and antineutrino beams is obtuse, which is forbidden in the
Standard Model. This leads to the new possibility of fast oscillations in a
two-beam system with opposing neutrino-antineutrino fluxes, even in the absence
of any spatial inhomogeneities. Finally, we solve the full non-linear equations
of motion in the four-beam model numerically, and explore the interplay of fast
and slow flavor conversions in the long-time behavior, in the presence of NSSI.
| [
{
"created": "Wed, 20 Sep 2017 13:44:17 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 16:57:31 GMT",
"version": "v2"
}
] | 2018-02-21 | [
[
"Dighe",
"Amol",
"",
"Tata Inst."
],
[
"Sen",
"Manibrata",
"",
"Tata Inst."
]
] | We study the effects of non-standard self-interactions (NSSI) of neutrinos streaming out of a core-collapse supernova. We show that with NSSI, the standard linear stability analysis gives rise to linearly as well as exponentially growing solutions. For a two-box spectrum, we demonstrate analytically that flavor-preserving NSSI lead to a suppression of bipolar collective oscillations. In the intersecting four-beam model, we show that flavor-violating NSSI can lead to fast oscillations even when the angle between the neutrino and antineutrino beams is obtuse, which is forbidden in the Standard Model. This leads to the new possibility of fast oscillations in a two-beam system with opposing neutrino-antineutrino fluxes, even in the absence of any spatial inhomogeneities. Finally, we solve the full non-linear equations of motion in the four-beam model numerically, and explore the interplay of fast and slow flavor conversions in the long-time behavior, in the presence of NSSI. |
hep-ph/9509270 | Nick Evans | Tom Appelquist and Nick Evans | An Extended Technicolor Model With QCD-like Symmetry Breaking | 25 pages, latex, 7 figures | Phys.Rev.D53:2789-2797,1996 | 10.1103/PhysRevD.53.2789 | YCTP-P10-95 | hep-ph | null | We present a one-doublet extended technicolor model, with all fermions in
fundamental representations. The bare lagrangian has no explicit mass terms but
generates masses through gauge symmetry breaking by purely QCD-like dynamics.
The model generates three families of quarks and leptons and can accommodate
the observed third family mass spectrum (including a large top mass and light
neutrinos). In addition, we show how the model may be extended to incorporate a
top color driven top mass without the need for a strong U(1) interaction. We
discuss the compatiblity of the model with experimental constraints and its
possible predicitive power with respect to first and second family masses.
| [
{
"created": "Mon, 11 Sep 1995 18:11:06 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Appelquist",
"Tom",
""
],
[
"Evans",
"Nick",
""
]
] | We present a one-doublet extended technicolor model, with all fermions in fundamental representations. The bare lagrangian has no explicit mass terms but generates masses through gauge symmetry breaking by purely QCD-like dynamics. The model generates three families of quarks and leptons and can accommodate the observed third family mass spectrum (including a large top mass and light neutrinos). In addition, we show how the model may be extended to incorporate a top color driven top mass without the need for a strong U(1) interaction. We discuss the compatiblity of the model with experimental constraints and its possible predicitive power with respect to first and second family masses. |
hep-ph/9901259 | Anatoli Efremov | A.V. Efremov (JINR, Dubna) | Highlight of Dubna-SPIN97 Workshop | Latex, sprocl.sty included, 8 pages. Talk at 13-th Internat.
Symposium on High Energy Spin Physics, Protvino, 8-12 Sept 1998. Will appear
in Proceedings (World Sci. PC). A misprint in title is corrected | null | null | null | hep-ph | null | A summary of the Workshop on High Energy Spin Physics (Dubna-SPIN97), Dubna,
7-12 July 1997, is given.
| [
{
"created": "Sat, 9 Jan 1999 18:34:43 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jan 1999 13:45:18 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Efremov",
"A. V.",
"",
"JINR, Dubna"
]
] | A summary of the Workshop on High Energy Spin Physics (Dubna-SPIN97), Dubna, 7-12 July 1997, is given. |
1803.04978 | Francisco J. de Anda | Francisco J. de Anda and Stephen F. King | An $S_4 \times SU(5)$ SUSY GUT of flavour in 6d | 23 pages, 6 figures. v3: Version published in JHEP | JHEP 07 (2018) 057 | 10.1007/JHEP07(2018)057 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a 6d model with a SUSY $SU(5)$ gauge symmetry. After
compactification, it explains the origin of the $S_4$ Family Symmetry with CSD3
vacuum alignment, as well as $SU(5)$ breaking with doublet-triplet splitting.
The model naturally accounts for all quark and lepton (including neutrino)
masses and mixings, incorporating the highly predictive Littlest Seesaw
structure. It spontaneously breaks CP symmetry, resulting in successful CP
violation in the quark and lepton sectors, while solving the Strong CP problem.
It also explains the Baryon Asymmetry of the Universe (BAU) through
leptogenesis, with the leptogenesis phase directly linked to the Dirac and
Majorana phases.
| [
{
"created": "Tue, 13 Mar 2018 18:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Mar 2018 15:33:18 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jul 2018 15:31:39 GMT",
"version": "v3"
}
] | 2018-07-12 | [
[
"de Anda",
"Francisco J.",
""
],
[
"King",
"Stephen F.",
""
]
] | We propose a 6d model with a SUSY $SU(5)$ gauge symmetry. After compactification, it explains the origin of the $S_4$ Family Symmetry with CSD3 vacuum alignment, as well as $SU(5)$ breaking with doublet-triplet splitting. The model naturally accounts for all quark and lepton (including neutrino) masses and mixings, incorporating the highly predictive Littlest Seesaw structure. It spontaneously breaks CP symmetry, resulting in successful CP violation in the quark and lepton sectors, while solving the Strong CP problem. It also explains the Baryon Asymmetry of the Universe (BAU) through leptogenesis, with the leptogenesis phase directly linked to the Dirac and Majorana phases. |
hep-ph/0208188 | Anatoli Kotikov | V. G. Krivokhijine, A. V. Kotikov (JINR, Dubna) | A study of QCD coupling constant and power corrections in the fixed
target deep inelastic measurements | 5 pages, 3 figures, latex. Talk presented at the X Int. Workshop on
Deep Inelastic Scattering (DIS2002), Cracow, 30 April - 4 May 2002 | Acta Phys.Polon. B33 (2002) 2947-2954 | null | null | hep-ph | null | We reanalyze deep inelastic scattering data of BCDMS Collaboration by
including proper cuts of ranges with large systematic errors. We perform also
the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM
and BFP Collaborations taking the data separately and in combined way and find
good agreement between these analyses. We extract the values of both the QCD
coupling constant \alpha_s(M^2_Z) up to NLO level and of the power corrections
to the structure function F_2.
| [
{
"created": "Wed, 21 Aug 2002 07:14:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krivokhijine",
"V. G.",
"",
"JINR, Dubna"
],
[
"Kotikov",
"A. V.",
"",
"JINR, Dubna"
]
] | We reanalyze deep inelastic scattering data of BCDMS Collaboration by including proper cuts of ranges with large systematic errors. We perform also the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM and BFP Collaborations taking the data separately and in combined way and find good agreement between these analyses. We extract the values of both the QCD coupling constant \alpha_s(M^2_Z) up to NLO level and of the power corrections to the structure function F_2. |
1104.3171 | Benedict von Harling | Tony Gherghetta, Benedict von Harling, Nicholas Setzer | A natural little hierarchy for RS from accidental SUSY | 37 pages, 3 figures; v2: minor corrections, version published in JHEP | JHEP 1107:011,2011 | 10.1007/JHEP07(2011)011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use supersymmetry to address the little hierarchy problem in
Randall-Sundrum models by naturally generating a hierarchy between the IR scale
and the electroweak scale. Supersymmetry is broken on the UV brane which
triggers the stabilization of the warped extra dimension at an IR scale of
order 10 TeV. The Higgs and top quark live near the IR brane whereas light
fermion generations are localized towards the UV brane. Supersymmetry breaking
causes the first two sparticle generations to decouple, thereby avoiding the
supersymmetric flavour and CP problems, while an accidental R-symmetry protects
the gaugino mass. The resulting low-energy sparticle spectrum consists of
stops, gauginos and Higgsinos which are sufficient to stabilize the little
hierarchy between the IR scale and the electroweak scale. Finally, the
supersymmetric little hierarchy problem is ameliorated by introducing a singlet
Higgs field on the IR brane.
| [
{
"created": "Fri, 15 Apr 2011 22:18:27 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2011 05:06:42 GMT",
"version": "v2"
}
] | 2011-08-22 | [
[
"Gherghetta",
"Tony",
""
],
[
"von Harling",
"Benedict",
""
],
[
"Setzer",
"Nicholas",
""
]
] | We use supersymmetry to address the little hierarchy problem in Randall-Sundrum models by naturally generating a hierarchy between the IR scale and the electroweak scale. Supersymmetry is broken on the UV brane which triggers the stabilization of the warped extra dimension at an IR scale of order 10 TeV. The Higgs and top quark live near the IR brane whereas light fermion generations are localized towards the UV brane. Supersymmetry breaking causes the first two sparticle generations to decouple, thereby avoiding the supersymmetric flavour and CP problems, while an accidental R-symmetry protects the gaugino mass. The resulting low-energy sparticle spectrum consists of stops, gauginos and Higgsinos which are sufficient to stabilize the little hierarchy between the IR scale and the electroweak scale. Finally, the supersymmetric little hierarchy problem is ameliorated by introducing a singlet Higgs field on the IR brane. |
1209.4354 | Estefania Coluccio Leskow | Ezequiel Alvarez and Estefania Coluccio Leskow | A charged Z' to conciliate the apparent disagreement between top-antitop
Tevatron forward-backward asymmetry and LHC charge asymmetry | 25 pages, 4 figures | null | 10.1103/PhysRevD.86.114034 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a charged, electrically neutral, and flavour changing Z' model to
conciliate the apparent disagreement between the important excess found in the
top-antitop Tevatron forward-backward asymmetry and the null -compatible with
negative- results found in the LHC charge asymmetry. We show that this model
contributes positively to the forward-backward asymmetry, whereas naturally a
new cancellation is turned on at the LHC, yielding a null, or even negative,
charge asymmetry. We found the region in parameter space that is simultaneously
allowed by the stringent Tevatron and LHC observables. We show that the model
is safe to atomic parity violation constraints and to tj resonance searches,
and propose a possible increase in the Z' width to avoid ttj constraints. We
evaluate the constraints to the model, as well as distinctive features in the
fore-coming experimental results.
| [
{
"created": "Wed, 19 Sep 2012 20:00:05 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Alvarez",
"Ezequiel",
""
],
[
"Leskow",
"Estefania Coluccio",
""
]
] | We propose a charged, electrically neutral, and flavour changing Z' model to conciliate the apparent disagreement between the important excess found in the top-antitop Tevatron forward-backward asymmetry and the null -compatible with negative- results found in the LHC charge asymmetry. We show that this model contributes positively to the forward-backward asymmetry, whereas naturally a new cancellation is turned on at the LHC, yielding a null, or even negative, charge asymmetry. We found the region in parameter space that is simultaneously allowed by the stringent Tevatron and LHC observables. We show that the model is safe to atomic parity violation constraints and to tj resonance searches, and propose a possible increase in the Z' width to avoid ttj constraints. We evaluate the constraints to the model, as well as distinctive features in the fore-coming experimental results. |
0811.2891 | Jose Illana | F. del Aguila, J.I. Illana, M.D. Jenkins | Precise limits from lepton flavour violating processes on the Littlest
Higgs model with T-parity | 41 pages, 11 figures; v3: matches published version in JHEP | JHEP 0901:080,2009 | 10.1088/1126-6708/2009/01/080 | CAFPE-109/08, UG-FT-239/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We recalculate the leading one-loop contributions to mu > e gamma and mu ->
eee in the Littlest Higgs model with T-parity, recovering previous results for
the former. When all the Goldstone interactions are taken into account, the
latter is also ultraviolet finite. The present experimental limits on these
processes require a somewhat heavy effective scale ~2.5 TeV, or the flavour
alignment of the Yukawa couplings of light and heavy leptons at the ~10% level,
or the splitting of heavy lepton masses to a similar precision. Present limits
on tau decays set no bounds on the corresponding parameters involving the tau
lepton
| [
{
"created": "Tue, 18 Nov 2008 15:24:20 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Nov 2008 14:21:23 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Jan 2009 18:06:21 GMT",
"version": "v3"
}
] | 2009-02-10 | [
[
"del Aguila",
"F.",
""
],
[
"Illana",
"J. I.",
""
],
[
"Jenkins",
"M. D.",
""
]
] | We recalculate the leading one-loop contributions to mu > e gamma and mu -> eee in the Littlest Higgs model with T-parity, recovering previous results for the former. When all the Goldstone interactions are taken into account, the latter is also ultraviolet finite. The present experimental limits on these processes require a somewhat heavy effective scale ~2.5 TeV, or the flavour alignment of the Yukawa couplings of light and heavy leptons at the ~10% level, or the splitting of heavy lepton masses to a similar precision. Present limits on tau decays set no bounds on the corresponding parameters involving the tau lepton |
hep-ph/0005233 | null | Stefano Catani (CERN) | Aspects of QCD, from the Tevatron to the LHC | 29 pages, latex, 13 postscript figures, to appear in the Proceedings
of the Workshop Physics at TeV Colliders, Les Houches, France June 1999 | null | null | CERN--TH/2000-073 | hep-ph | null | This contribution presents a selection of the topics (parton densities,
fixed-order calculations, parton showers, soft-gluon resummation) discussed in
my introductory lectures at the Workshop and includes a pedagogical overview of
the corresponding theoretical tools.
| [
{
"created": "Tue, 23 May 2000 15:53:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Catani",
"Stefano",
"",
"CERN"
]
] | This contribution presents a selection of the topics (parton densities, fixed-order calculations, parton showers, soft-gluon resummation) discussed in my introductory lectures at the Workshop and includes a pedagogical overview of the corresponding theoretical tools. |
2108.03063 | Sunao Sugiyama | Sunao Sugiyama, Masahiro Takada, Alexander Kusenko | Possible evidence of QCD axion stars in HSC and OGLE microlensing events | 8 pages, 2 figures; latest version for the publication in Physics
Letters B | null | 10.1016/j.physletb.2023.137891 | IPMU21-0050 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter in the form of axions is expected to form miniclusters, and their
dense regions can harbor compact axion stars. Such axion stars could be
discovered by microlensing events. In particular, some candidate events
reported by Subaru HSC and OGLE can be explained simultaneously if the axion
stars with masses of the order of the Earth mass make up about
$\sim27^{+7}_{013}$ percent of dark matter. For QCD axions, this corresponds to
the axion mass in the range $10^{-9}-10^{-6}$ eV, which is consistent with the
experimental constraints, as well as the cosmological anthropic window of
parameters.
| [
{
"created": "Fri, 6 Aug 2021 11:25:05 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Apr 2023 08:20:08 GMT",
"version": "v2"
}
] | 2023-04-10 | [
[
"Sugiyama",
"Sunao",
""
],
[
"Takada",
"Masahiro",
""
],
[
"Kusenko",
"Alexander",
""
]
] | Dark matter in the form of axions is expected to form miniclusters, and their dense regions can harbor compact axion stars. Such axion stars could be discovered by microlensing events. In particular, some candidate events reported by Subaru HSC and OGLE can be explained simultaneously if the axion stars with masses of the order of the Earth mass make up about $\sim27^{+7}_{013}$ percent of dark matter. For QCD axions, this corresponds to the axion mass in the range $10^{-9}-10^{-6}$ eV, which is consistent with the experimental constraints, as well as the cosmological anthropic window of parameters. |
hep-ph/9612232 | null | Zurab Berezhiani and Zurab Tavartkiladze (INFN Ferrara) | More missing VEV mechanism in supersymmetric SO(10) model | 18 pages, LATEX, no figures | Phys.Lett. B409 (1997) 220-228 | 10.1016/S0370-2693(97)00873-3 | INFN-FE 14/96 | hep-ph hep-th | null | The anomalous gauge $U(1)_A$ symmetry which could emerge in the context of
the string theories can be very useful ingredient towards builting the complete
supersymmetric SO(10) model. We present an example of the $SO(10)\times U(1)_A$
model which provides the ``all order'' solution to the doublet-triplet
splitting problem via the missing VEV mechanism -- the Planck scale corrections
only can induce the mu-term naturally of order 1 TeV. An interesting feature of
this model is that all relevant GUT scale VEVs are defined by the single
dimensional parameter in the Higgs superpotential, so that the SO(10) symmetry
breaks down to the MSSM practically at one step, without intermediate stages.
The colour Higgsino mediated d=5 operators can be naturally suppressed. We also
extend the model by implementing $U(1)_A$ as a horizontal symmetry for
explaining the fermion mass and mixing pattern, and obtain a predictive texture
for fermion masses. This model implies a moderate value of $\tan\beta$ ($\sim
6-10$) and leads to five predictions for the low energy observables. It also
leads to the neutrino masses and mixing pattern that could naturally explain
both the atmospheric and solar neutrino problems. In addition, a remarkable
interplay of the SO(10) and $U(1)_A$ symmetries guarantees an automatic R
parity conservation at any order in $M_P^{-1}$, and also suppresses the Planck
scale induced B and L violating d=5 operators to the needed level.
| [
{
"created": "Mon, 2 Dec 1996 21:40:52 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 1996 03:16:21 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Berezhiani",
"Zurab",
"",
"INFN Ferrara"
],
[
"Tavartkiladze",
"Zurab",
"",
"INFN Ferrara"
]
] | The anomalous gauge $U(1)_A$ symmetry which could emerge in the context of the string theories can be very useful ingredient towards builting the complete supersymmetric SO(10) model. We present an example of the $SO(10)\times U(1)_A$ model which provides the ``all order'' solution to the doublet-triplet splitting problem via the missing VEV mechanism -- the Planck scale corrections only can induce the mu-term naturally of order 1 TeV. An interesting feature of this model is that all relevant GUT scale VEVs are defined by the single dimensional parameter in the Higgs superpotential, so that the SO(10) symmetry breaks down to the MSSM practically at one step, without intermediate stages. The colour Higgsino mediated d=5 operators can be naturally suppressed. We also extend the model by implementing $U(1)_A$ as a horizontal symmetry for explaining the fermion mass and mixing pattern, and obtain a predictive texture for fermion masses. This model implies a moderate value of $\tan\beta$ ($\sim 6-10$) and leads to five predictions for the low energy observables. It also leads to the neutrino masses and mixing pattern that could naturally explain both the atmospheric and solar neutrino problems. In addition, a remarkable interplay of the SO(10) and $U(1)_A$ symmetries guarantees an automatic R parity conservation at any order in $M_P^{-1}$, and also suppresses the Planck scale induced B and L violating d=5 operators to the needed level. |
hep-ph/9408201 | Azusa Yamaguchi | Azusa Yamaguchi, Akio Sugamoto | Electroweak Baryogenesis and the Phase Transition Dynamics | OCHA-PP-44, (contribution paper to ICHEP94, Glasgow, 20 - 27 th July
1994) | Mod.Phys.Lett.A9:2599-2610,1994 | 10.1142/S0217732394002446 | null | hep-ph | null | The baryogenesis is reanalyzed based on the model by A.G.Cohen et al., in
which the lepton number, generated by the neutrinos' scattering from the bubble
walls appearing in the development of the electroweak phase transition, is
converted to the baryon number excess through the sphaleron transition. A
formula obtained in this paper on the lepton number production rate is correct
for the both thin and thick walls within the linear approximation.
Investigation on the time-development of the first order phase transition is
simulated, including the temporal change of the wall velocity as well as the
fusion effect of the bubbles. The details of such phase transition dynamics are
found to affect considerably the final value of the baryon number excess.
| [
{
"created": "Mon, 1 Aug 1994 06:57:11 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Yamaguchi",
"Azusa",
""
],
[
"Sugamoto",
"Akio",
""
]
] | The baryogenesis is reanalyzed based on the model by A.G.Cohen et al., in which the lepton number, generated by the neutrinos' scattering from the bubble walls appearing in the development of the electroweak phase transition, is converted to the baryon number excess through the sphaleron transition. A formula obtained in this paper on the lepton number production rate is correct for the both thin and thick walls within the linear approximation. Investigation on the time-development of the first order phase transition is simulated, including the temporal change of the wall velocity as well as the fusion effect of the bubbles. The details of such phase transition dynamics are found to affect considerably the final value of the baryon number excess. |
2301.04282 | Guo-Yun Shao | Gun-yun Shao, Xin-ran Yang, Chong-long Xie, Wei-bo He | Speed of sound in QCD matter at finite temperature and density]{Speed of
sound in QCD matter at finite temperature and density | 19 pages, 10 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The speed of sound in QCD matter at finite temperature and density is
investigated within the Polyakov loop improved Nambu--Jona-Lasinio (PNJL)
model. The spinodal structure associated with the chiral first-order chiral
phase transition is considered to describe the continuous variation of the
speed of sound. The behaviors of the squared sound speed in different phases,
including the stable, metastable and unstable phases, are derived. The relation
between speed of sound and QCD phase transitions is systematically explored. In
particular, the boundary of vanishing sound velocity is derived in the
temperature-density phase diagram, and the region where the sound wave equation
being broken is pointed out. Some interesting features of speed of sound under
different definitions are also discussed.
| [
{
"created": "Wed, 11 Jan 2023 03:04:06 GMT",
"version": "v1"
}
] | 2023-01-12 | [
[
"Shao",
"Gun-yun",
""
],
[
"Yang",
"Xin-ran",
""
],
[
"Xie",
"Chong-long",
""
],
[
"He",
"Wei-bo",
""
]
] | The speed of sound in QCD matter at finite temperature and density is investigated within the Polyakov loop improved Nambu--Jona-Lasinio (PNJL) model. The spinodal structure associated with the chiral first-order chiral phase transition is considered to describe the continuous variation of the speed of sound. The behaviors of the squared sound speed in different phases, including the stable, metastable and unstable phases, are derived. The relation between speed of sound and QCD phase transitions is systematically explored. In particular, the boundary of vanishing sound velocity is derived in the temperature-density phase diagram, and the region where the sound wave equation being broken is pointed out. Some interesting features of speed of sound under different definitions are also discussed. |
hep-ph/0407181 | Thomas Mehen | Thomas Mehen and Roxanne P. Springer (Duke U.) | Heavy-Quark Symmetry and the Electromagnetic Decays of Excited Charmed
Strange Mesons | 25 pages, 3 figures | Phys.Rev.D70:074014,2004 | 10.1103/PhysRevD.70.074014 | null | hep-ph hep-ex | null | Heavy-hadron chiral perturbation theory (HH$\chi$PT) is applied to the decays
of the even-parity charmed strange mesons, D_{s0}(2317) and D_{s1}(2460).
Heavy-quark spin symmetry predicts the branching fractions for the three
electromagnetic decays of these states to the ground states D_s and D_s^* in
terms of a single parameter. The resulting predictions for two of the branching
fractions are significantly higher than current upper limits from the CLEO
experiment. Leading corrections to the branching ratios from chiral loop
diagrams and spin-symmetry violating operators in the HH$\chi$PT Lagrangian can
naturally account for this discrepancy. Finally the proposal that the
D_{s0}(2317) (D_{s1}(2460)) is a hadronic bound state of a D (D^*) meson and a
kaon is considered. Leading order predictions for electromagnetic branching
ratios in this molecular scenario are in very poor agreement with existing
data.
| [
{
"created": "Thu, 15 Jul 2004 20:32:42 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Mehen",
"Thomas",
"",
"Duke U."
],
[
"Springer",
"Roxanne P.",
"",
"Duke U."
]
] | Heavy-hadron chiral perturbation theory (HH$\chi$PT) is applied to the decays of the even-parity charmed strange mesons, D_{s0}(2317) and D_{s1}(2460). Heavy-quark spin symmetry predicts the branching fractions for the three electromagnetic decays of these states to the ground states D_s and D_s^* in terms of a single parameter. The resulting predictions for two of the branching fractions are significantly higher than current upper limits from the CLEO experiment. Leading corrections to the branching ratios from chiral loop diagrams and spin-symmetry violating operators in the HH$\chi$PT Lagrangian can naturally account for this discrepancy. Finally the proposal that the D_{s0}(2317) (D_{s1}(2460)) is a hadronic bound state of a D (D^*) meson and a kaon is considered. Leading order predictions for electromagnetic branching ratios in this molecular scenario are in very poor agreement with existing data. |
1411.7155 | Klaus Sibold | Sven Heinemeyer, Jisuke Kubo, Myriam Mondragon, Olivier Piguet, Klaus
Sibold (responsible author), George Zoupanos, Wolfhart Zimmermann | Reduction of couplings and its application in particle physics, Finite
theories, Higgs and top mass predictions | At
\href{http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=222}{Proceedings of
Science, Sissa, 155 Trieste, Italy} the reader can find an electronic version
which includes the original articles. v2: author added | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this report we tell the story of the notion "reduction of couplings" as we
witnessed it in the course of time. Born as an innocent child of
renormalization theory it first served the study of asymptotic behavior of
several couplings in a given model. Reduced couplings appeared as functions of
a primary one, compatible with the renormalization group equation and thus
solutions of a specific set of ordinary differential equations. If these
functions have the form of power series the respective theories resemble
standard renormalizable ones and thus widen considerably the area covered until
then by symmetries as a tool for constraining the number of couplings
consistently. Still on the more abstract level reducing couplings enabled one
to construct theories with beta-functions vanishing to all orders of
perturbation theory. Reduction of couplings became physicswise truely
interesting and phenomenologically important when applied to the standard model
and its possible extensions. In particular in the context of supersymmetric
theories it became the most powerful tool known today once it was learned how
to apply it also to couplings having dimension of mass and to mass parameters.
Technically this all relies on the basic property that reducing couplings is a
renormalization scheme independent procedure. Predictions of top and Higgs mass
prior to their experimental finding highlight the fundamental physical
significance of this notion. Twenty-two original articles and one set of
lectures are being commented, put into historical perspective and interrelated
with each other.
| [
{
"created": "Wed, 26 Nov 2014 09:51:54 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Nov 2014 11:42:01 GMT",
"version": "v2"
}
] | 2014-12-01 | [
[
"Heinemeyer",
"Sven",
"",
"responsible author"
],
[
"Kubo",
"Jisuke",
"",
"responsible author"
],
[
"Mondragon",
"Myriam",
"",
"responsible author"
],
[
"Piguet",
"Olivier",
"",
"responsible author"
],
[
"Sibold",
"Klaus",
... | In this report we tell the story of the notion "reduction of couplings" as we witnessed it in the course of time. Born as an innocent child of renormalization theory it first served the study of asymptotic behavior of several couplings in a given model. Reduced couplings appeared as functions of a primary one, compatible with the renormalization group equation and thus solutions of a specific set of ordinary differential equations. If these functions have the form of power series the respective theories resemble standard renormalizable ones and thus widen considerably the area covered until then by symmetries as a tool for constraining the number of couplings consistently. Still on the more abstract level reducing couplings enabled one to construct theories with beta-functions vanishing to all orders of perturbation theory. Reduction of couplings became physicswise truely interesting and phenomenologically important when applied to the standard model and its possible extensions. In particular in the context of supersymmetric theories it became the most powerful tool known today once it was learned how to apply it also to couplings having dimension of mass and to mass parameters. Technically this all relies on the basic property that reducing couplings is a renormalization scheme independent procedure. Predictions of top and Higgs mass prior to their experimental finding highlight the fundamental physical significance of this notion. Twenty-two original articles and one set of lectures are being commented, put into historical perspective and interrelated with each other. |
1205.4129 | Jenifer Nebreda | J. Nebreda, J. R. Pelaez and G. Rios | Determination of SU(2) Chiral Perturbation Theory low energy constants
from a precise description of pion-pion scattering threshold parameters | 16 pages. Version published in Phys. Rev. D. Enlarged discussions in
several sections, appendices and many references added. Results and
conclusions unchanged | Phys. Rev. D 88, 054001 (2013) | 10.1103/PhysRevD.88.054001 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the values of the one- and two-loop low energy constants
appearing in the SU(2) Chiral Perturbation Theory calculation of pion-pion
scattering. For this we use a recent and precise sum rule determination of some
scattering lengths and slopes that appear in the effective range expansion. In
addition we provide sum rules for these coefficients up to third order in the
expansion. Our results when using only the scattering lengths and slopes of the
S, P, D and F waves are consistent with previous determinations, but seem to
require higher order contributions if they are to accommodate the third order
coefficients of the effective range expansion.
| [
{
"created": "Fri, 18 May 2012 10:30:08 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 2013 10:33:51 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Nebreda",
"J.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Rios",
"G.",
""
]
] | We determine the values of the one- and two-loop low energy constants appearing in the SU(2) Chiral Perturbation Theory calculation of pion-pion scattering. For this we use a recent and precise sum rule determination of some scattering lengths and slopes that appear in the effective range expansion. In addition we provide sum rules for these coefficients up to third order in the expansion. Our results when using only the scattering lengths and slopes of the S, P, D and F waves are consistent with previous determinations, but seem to require higher order contributions if they are to accommodate the third order coefficients of the effective range expansion. |
0902.2049 | Philipp Gubler | P.Gubler, D.Jido, T.Kojo, T.Nishikawa, M.Oka | Spin-3/2 Pentaquark in QCD Sum Rules | 9 pages, 6 figures, 1 table. To be published in Phys. Rev. D | Phys.Rev.D79:114011,2009 | 10.1103/PhysRevD.79.114011 | YITP-09-05, RBRC-775 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD sum rule method is formulated for the strangeness +1 pentaquark
baryon with isospin I=0 and spin-parity J^P = 3/2^\pm. The spin-3/2 states are
considered to be narrower than the spin-1/2 ones, and thus may provide a
natural explanation for the experimentally observed narrow width of \Theta^+.
In order to obtain reliable results in QCD sum rule calculations, we stress the
importance of establishing a wide Borel window, where convergence of the
operator product expansion and sufficient low-mass strength of the spectral
function are guaranteed. To this end, we employ the difference of two
independent correlators so that the high-energy continuum contribution is
suppressed. The stability of the physical quantities against the Borel mass is
confirmed within the Borel window. It is found that the sum rule gives positive
evidence for the (I, J^P) = (0, 3/2^+) state with a mass of about 1.4 \pm 0.2
GeV, while we cannot extract any evidence for the (0, 3/2^-) state.
| [
{
"created": "Thu, 12 Feb 2009 09:03:24 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2009 10:31:55 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Gubler",
"P.",
""
],
[
"Jido",
"D.",
""
],
[
"Kojo",
"T.",
""
],
[
"Nishikawa",
"T.",
""
],
[
"Oka",
"M.",
""
]
] | The QCD sum rule method is formulated for the strangeness +1 pentaquark baryon with isospin I=0 and spin-parity J^P = 3/2^\pm. The spin-3/2 states are considered to be narrower than the spin-1/2 ones, and thus may provide a natural explanation for the experimentally observed narrow width of \Theta^+. In order to obtain reliable results in QCD sum rule calculations, we stress the importance of establishing a wide Borel window, where convergence of the operator product expansion and sufficient low-mass strength of the spectral function are guaranteed. To this end, we employ the difference of two independent correlators so that the high-energy continuum contribution is suppressed. The stability of the physical quantities against the Borel mass is confirmed within the Borel window. It is found that the sum rule gives positive evidence for the (I, J^P) = (0, 3/2^+) state with a mass of about 1.4 \pm 0.2 GeV, while we cannot extract any evidence for the (0, 3/2^-) state. |
1506.07302 | Zuo-Tang Liang | Kai-bao Chen, Shu-yi Wei and Zuo-tang Liang | Three Dimensional Imaging of the Nucleon and Semi-Inclusive High Energy
Reactions | 20 pages, 7 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a short overview on the studies of transverse momentum dependent
parton distribution functions of the nucleon. The aim of such studies is to
provide a three dimensional imagining of the nucleon and a comprehensive
description of semi-inclusive high energy reactions. By comparing with the
theoretical framework that we have for the inclusive deep inelastic
lepton-nucleon scattering and the one-dimensional imaging of the nucleon, we
summarize what we need to do in order to construct such a comprehensive
theoretical framework for semi-inclusive processes in terms of three
dimensional gauge invariant parton distributions. After that, we present an
overview of what we have already achieved with emphasize on the theoretical
framework for semi-inclusive reactions in leading order perturbative QCD but
with leading and higher twist contributions. We summarize in particular the
results for the differential cross section and the azimuthal spin asymmetries
in terms of the gauge invariant transverse momentum dependent parton
distribution functions. We also briefly summarize the available experimental
results on semi-inclusive reactions and parameterizations of transverse
momentum dependent parton distributions extracted from them and make an outlook
for the future studies.
| [
{
"created": "Wed, 24 Jun 2015 10:12:15 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Chen",
"Kai-bao",
""
],
[
"Wei",
"Shu-yi",
""
],
[
"Liang",
"Zuo-tang",
""
]
] | We present a short overview on the studies of transverse momentum dependent parton distribution functions of the nucleon. The aim of such studies is to provide a three dimensional imagining of the nucleon and a comprehensive description of semi-inclusive high energy reactions. By comparing with the theoretical framework that we have for the inclusive deep inelastic lepton-nucleon scattering and the one-dimensional imaging of the nucleon, we summarize what we need to do in order to construct such a comprehensive theoretical framework for semi-inclusive processes in terms of three dimensional gauge invariant parton distributions. After that, we present an overview of what we have already achieved with emphasize on the theoretical framework for semi-inclusive reactions in leading order perturbative QCD but with leading and higher twist contributions. We summarize in particular the results for the differential cross section and the azimuthal spin asymmetries in terms of the gauge invariant transverse momentum dependent parton distribution functions. We also briefly summarize the available experimental results on semi-inclusive reactions and parameterizations of transverse momentum dependent parton distributions extracted from them and make an outlook for the future studies. |
0812.3357 | Francesco Giacosa | Francesco Giacosa and Giuseppe Pagliara | Brief report on `Radiative $\phi$ decays with derivative interactions' | Based on a presentation held at Confinement8, Quark Confinement and
the Hadron Spectrum, Mainz (Germany), 1-6 September 2008. To appear in
Proceedings of Science | PoS Confinement8:163,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the line shapes of radiative $\phi$-decays with a direct coupling of
the $\phi$ meson to the $f_{0}(980)$ and $a_{0}(980)$ scalar mesons. The latter
couple via derivative interactions to $\pi_0 \pi_0$ and $\pi_0 \eta$,
respectively. Although the kaon-loop mechanism is usually regarded as the
dominant mechanism in radiative $\phi$ decays, here we test a different
possibility: we set the kaon-loop to zero and we fit the theoretical curves to
the data by retaining only the direct coupling. Remarkably, satisfactory fits
can be achieved, mainly due to the effects of derivative interactions of scalar
with pseudoscalar mesons.
| [
{
"created": "Wed, 17 Dec 2008 18:03:46 GMT",
"version": "v1"
}
] | 2009-06-25 | [
[
"Giacosa",
"Francesco",
""
],
[
"Pagliara",
"Giuseppe",
""
]
] | We study the line shapes of radiative $\phi$-decays with a direct coupling of the $\phi$ meson to the $f_{0}(980)$ and $a_{0}(980)$ scalar mesons. The latter couple via derivative interactions to $\pi_0 \pi_0$ and $\pi_0 \eta$, respectively. Although the kaon-loop mechanism is usually regarded as the dominant mechanism in radiative $\phi$ decays, here we test a different possibility: we set the kaon-loop to zero and we fit the theoretical curves to the data by retaining only the direct coupling. Remarkably, satisfactory fits can be achieved, mainly due to the effects of derivative interactions of scalar with pseudoscalar mesons. |
hep-ph/9907346 | Sharon Jensen | S. J. Brodsky (SLAC) | Perspectives on EPIC Physics | Talk presented at EPIC'99 Workshop, Indiana University, April 1999 | null | null | SLAC-PUB-8198 | hep-ph | null | An electron-proton/ion polarized beam collider (EPIC) with high luminosity
and center-of-mass energy $\sqrt s = 25$ GeV would be a valuable facility for
fundamental studies of proton and nuclear structure and tests of quantum
chromodynamics, I review a sample of prospective EPIC topics, particularly
semi-exclusive reactions, studies of the proton fragmentation region, heavy
quark electroproduction, and a new probe of odderon/pomeron interference.
| [
{
"created": "Tue, 13 Jul 1999 22:15:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brodsky",
"S. J.",
"",
"SLAC"
]
] | An electron-proton/ion polarized beam collider (EPIC) with high luminosity and center-of-mass energy $\sqrt s = 25$ GeV would be a valuable facility for fundamental studies of proton and nuclear structure and tests of quantum chromodynamics, I review a sample of prospective EPIC topics, particularly semi-exclusive reactions, studies of the proton fragmentation region, heavy quark electroproduction, and a new probe of odderon/pomeron interference. |
0910.1326 | LuXin Liu | Lu-Xin Liu | Renormalization Invariants and Quark Flavor Mixings | 23 pages, 7 figures | Int.J.Mod.Phys.A25:4975-4991,2010 | 10.1142/S0217751X10050640 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A set of renormalization invariants is constructed using approximate,
two-flavor, analytic solutions for RGEs. These invariants exhibit explicitly
the correlation between quark flavor mixings and mass ratios in the context of
the SM, DHM and MSSM of electroweak interaction. The well known empirical
relations $\theta_{23}\propto m_s /m_b $, $\theta_{13}\propto m_d /m_b$ can
thus be understood as the result of renormalization evolution toward the
infrared point. The validity of this approximation is evaluated by comparing
the numerical solutions with the analytical approach. It is found that the
scale dependence of these quantities for general three flavoring mixing follows
closely these invariants up to the GUT scale.
| [
{
"created": "Wed, 7 Oct 2009 17:41:22 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2010 13:30:18 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jul 2010 09:15:45 GMT",
"version": "v3"
}
] | 2010-10-28 | [
[
"Liu",
"Lu-Xin",
""
]
] | A set of renormalization invariants is constructed using approximate, two-flavor, analytic solutions for RGEs. These invariants exhibit explicitly the correlation between quark flavor mixings and mass ratios in the context of the SM, DHM and MSSM of electroweak interaction. The well known empirical relations $\theta_{23}\propto m_s /m_b $, $\theta_{13}\propto m_d /m_b$ can thus be understood as the result of renormalization evolution toward the infrared point. The validity of this approximation is evaluated by comparing the numerical solutions with the analytical approach. It is found that the scale dependence of these quantities for general three flavoring mixing follows closely these invariants up to the GUT scale. |
1212.2753 | Abdullah Shams Bin Tariq | M. Hossain Ali, M. Jakir Hossain and Abdullah Shams Bin Tariq | Congeniality Bounds on Quark Masses from Nucleosynthesis | 5 pages, 4 figures, additional constraint in addendum, explanatory
text and refs added, main conclusion unchanged - rather strengthened, version
accepted in Phys. Rev. D | Phys. Rev. D 88, 034001 (2013) | 10.1103/PhysRevD.88.034001 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/3.0/ | The work of Jaffe, Jenkins and Kimchi [Phys. Rev. D79, 065014 (2009)] is
revisited to see if indeed the region of congeniality found in their analysis
survives further restrictions from nucleosynthesis. It is observed that much of
their congenial region disappears when imposing conditions required to produce
the correct and required abundances of the primordial elements as well as
ensure that stars can continue to burn hydrogen nuclei to form helium as the
first step in forming heavier elements in stellar nucleosynthesis. The
remaining region is a very narrow slit reduced in width from around 29 MeV
found by Jaffe et al. to only about 2.2 MeV in the difference of the
nucleon/quark masses. Further bounds on $\delta m_q /m_q$ seem to reduce even
this narrow slit to the physical point itself.
| [
{
"created": "Wed, 12 Dec 2012 10:00:12 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2012 19:50:23 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jul 2013 08:24:20 GMT",
"version": "v3"
}
] | 2013-08-27 | [
[
"Ali",
"M. Hossain",
""
],
[
"Hossain",
"M. Jakir",
""
],
[
"Tariq",
"Abdullah Shams Bin",
""
]
] | The work of Jaffe, Jenkins and Kimchi [Phys. Rev. D79, 065014 (2009)] is revisited to see if indeed the region of congeniality found in their analysis survives further restrictions from nucleosynthesis. It is observed that much of their congenial region disappears when imposing conditions required to produce the correct and required abundances of the primordial elements as well as ensure that stars can continue to burn hydrogen nuclei to form helium as the first step in forming heavier elements in stellar nucleosynthesis. The remaining region is a very narrow slit reduced in width from around 29 MeV found by Jaffe et al. to only about 2.2 MeV in the difference of the nucleon/quark masses. Further bounds on $\delta m_q /m_q$ seem to reduce even this narrow slit to the physical point itself. |
2204.08207 | Bing-Dong Wan | Chia-Wei Liu and Bing-Dong Wan | Searching $B_c^\ast$ via conservation laws | 15 pages, 4 figures. Accepted by PRD | null | 10.1103/PhysRevD.105.114015 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | To distinguish $B_c^{\ast +}(1^3S_1)$ and $B_c^+(1^1S_0)$ in the experiments,
we propose two methods based on the conservation laws. I. From the angular
momentum conservation, a nonzero helicity of $J/\psi$ of $B_c^{(\ast)+ } \to
J/\psi \pi^+$ would be an evidence of $B_c^{\ast +}$. II. Since $B_c^+ \to B^+
\phi$ is kinematically forbidden, $ B_c^{\ast +} \to B^+ \phi$ provides a clean
channel to probe $B_c^{\ast +}$\,. Particularly, our results show that
$B_c^{\ast +}$ is promising to be observed at LHC via $B_c^{(\ast)+} \to J/\psi
\pi^+$. On the other hand, we find that ${\cal B} ( B_c^{\ast+} \to B^+ \phi) =
( 7.0 \pm 3.0 ) \times 10 ^{-9} $, which is also feasible to be measured at the
forthcoming experiments at HL-LHC and FCC-hh.
| [
{
"created": "Mon, 18 Apr 2022 07:58:34 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2022 03:47:38 GMT",
"version": "v2"
}
] | 2022-06-17 | [
[
"Liu",
"Chia-Wei",
""
],
[
"Wan",
"Bing-Dong",
""
]
] | To distinguish $B_c^{\ast +}(1^3S_1)$ and $B_c^+(1^1S_0)$ in the experiments, we propose two methods based on the conservation laws. I. From the angular momentum conservation, a nonzero helicity of $J/\psi$ of $B_c^{(\ast)+ } \to J/\psi \pi^+$ would be an evidence of $B_c^{\ast +}$. II. Since $B_c^+ \to B^+ \phi$ is kinematically forbidden, $ B_c^{\ast +} \to B^+ \phi$ provides a clean channel to probe $B_c^{\ast +}$\,. Particularly, our results show that $B_c^{\ast +}$ is promising to be observed at LHC via $B_c^{(\ast)+} \to J/\psi \pi^+$. On the other hand, we find that ${\cal B} ( B_c^{\ast+} \to B^+ \phi) = ( 7.0 \pm 3.0 ) \times 10 ^{-9} $, which is also feasible to be measured at the forthcoming experiments at HL-LHC and FCC-hh. |
hep-ph/0205216 | Jose W. F. Valle | Jose W. F. Valle | Neutrinos: summarizing the state-of-the-art | 23 pages, 22 figures, invited talk at Fourth International Heidelberg
Conference on. Dark Matter in Astro and Particle Physics, Cape Town, South
Africa 4-9 February, 2002 | null | null | null | hep-ph | null | I review oscillation solutions to the neutrino anomalies and discuss how to
account for the required pattern of neutrino masses and mixings from first
principles. Unification and low-energy bottom-up approaches are discussed, the
latter open up the possibility of testing neutrino mixing at high energy
colliders, such as the LHC. Large \ne mixing is consistent with Supernova (SN)
astrophysics and may serve to probe galactic SN parameters at Cherenkov
detectors. I discuss the robustness of the atmospheric neutrino oscillation
hypothesis against the presence of Flavor Changing (FC) Non-Standard neutrino
Interactions (NSI), generally expected in models of neutrino mass. Atmospheric
data strongly constrain FC-NSI in the \nm-\nt channel, while solar data can be
explained by FC-NSI in the \ne-\nt channel, or, alternatively, by spin flavor
precession. I illustrate how a neutrino factory offers a unique way to probe or
FC-NSI and argue that a near-site detector is necessary in order to probe for
leptonic mixing and CP violation.
| [
{
"created": "Mon, 20 May 2002 14:48:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Valle",
"Jose W. F.",
""
]
] | I review oscillation solutions to the neutrino anomalies and discuss how to account for the required pattern of neutrino masses and mixings from first principles. Unification and low-energy bottom-up approaches are discussed, the latter open up the possibility of testing neutrino mixing at high energy colliders, such as the LHC. Large \ne mixing is consistent with Supernova (SN) astrophysics and may serve to probe galactic SN parameters at Cherenkov detectors. I discuss the robustness of the atmospheric neutrino oscillation hypothesis against the presence of Flavor Changing (FC) Non-Standard neutrino Interactions (NSI), generally expected in models of neutrino mass. Atmospheric data strongly constrain FC-NSI in the \nm-\nt channel, while solar data can be explained by FC-NSI in the \ne-\nt channel, or, alternatively, by spin flavor precession. I illustrate how a neutrino factory offers a unique way to probe or FC-NSI and argue that a near-site detector is necessary in order to probe for leptonic mixing and CP violation. |
0804.3941 | Alexandre Kisselev | A.V. Kisselev | RS model with a small curvature and two-photon production at the LHC | 23 pages, 12 figures. Appendix and 4 figures are added | JHEP 0809:039,2008 | 10.1088/1126-6708/2008/09/039 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The p_trans-distribution for the diphoton production at the LHC is calculated
in the modified Randall-Sundrum model with a small curvature of the space-time
kappa, and 5-dimensional Planck scale M_5 in the TeV region. The discovery
limits on M_5 are obtained to be 9.4 TeV and 11.6 TeV for the integrated
luminosities 30 fb^(-1) and 100 fb^(-1), respectively. These limits do not
depend on kappa provided it is much smaller than M_5. The account of graviton
widths is a crucial points of our calculations.
| [
{
"created": "Thu, 24 Apr 2008 14:43:26 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2008 15:08:52 GMT",
"version": "v2"
}
] | 2009-02-09 | [
[
"Kisselev",
"A. V.",
""
]
] | The p_trans-distribution for the diphoton production at the LHC is calculated in the modified Randall-Sundrum model with a small curvature of the space-time kappa, and 5-dimensional Planck scale M_5 in the TeV region. The discovery limits on M_5 are obtained to be 9.4 TeV and 11.6 TeV for the integrated luminosities 30 fb^(-1) and 100 fb^(-1), respectively. These limits do not depend on kappa provided it is much smaller than M_5. The account of graviton widths is a crucial points of our calculations. |
hep-ph/9907304 | Nikolai Kivel | N. Kivel | Conformal string operators and skewed parton distributions | 5 pages, 1 figure, talk given at PANIC99, June 10-16, Uppsala, Sweden | Nucl.Phys. A663 (2000) 1011-1014 | 10.1016/S0375-9474(99)00756-3 | TUM-39-16 | hep-ph | null | We discuss skewed parton distributions in the coordinate space. Solution of
the corresponding LO evolution equation is constructed in terms of
eigenfunctions of the evolution kernel and its relation to the conformal
symmetry is explained.
| [
{
"created": "Mon, 12 Jul 1999 11:12:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kivel",
"N.",
""
]
] | We discuss skewed parton distributions in the coordinate space. Solution of the corresponding LO evolution equation is constructed in terms of eigenfunctions of the evolution kernel and its relation to the conformal symmetry is explained. |
1506.02138 | Alan Cornell | Ammar Abdalgabar and Alan S. Cornell | Large trilinear $A_t$ soft supersymmetry breaking coupling from 5D MSSM | 6 pages, 6 figures, to appear in the proceedings of the High Energy
Particle Physics Workshop 2015 (iThemba Labs, Johannesburg, South Africa) | null | 10.1088/1742-6596/645/1/012001 | WITS-MITP-009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of generating a large trilinear $A_t$ soft supersymmetry
breaking coupling at low energies through renormalisation group evolution in
the 5D MSSM is investigated. Using the power law running in five dimensions and
a compactification scale in the 10-$10^3$ TeV range, to show that gluino mass
may drive a large enough $A_t$ to reproduce the measured Higgs mass and have a
light stop superpartner below $\sim 1$ TeV as preferred by the fine tuning
argument for the Higgs mass.
| [
{
"created": "Sat, 6 Jun 2015 12:22:55 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Abdalgabar",
"Ammar",
""
],
[
"Cornell",
"Alan S.",
""
]
] | The possibility of generating a large trilinear $A_t$ soft supersymmetry breaking coupling at low energies through renormalisation group evolution in the 5D MSSM is investigated. Using the power law running in five dimensions and a compactification scale in the 10-$10^3$ TeV range, to show that gluino mass may drive a large enough $A_t$ to reproduce the measured Higgs mass and have a light stop superpartner below $\sim 1$ TeV as preferred by the fine tuning argument for the Higgs mass. |
1811.07027 | Xiaojun Yao | Xiaojun Yao and Thomas Mehen | Quarkonium In-Medium Transport Equation Derived from First Principles | 29 pages, 1 figure, minor changes, version accepted by PRD | Phys. Rev. D 99, 096028 (2019) | 10.1103/PhysRevD.99.096028 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the open quantum system formalism to study the dynamical in-medium
evolution of quarkonium. The system of quarkonium is described by potential
non-relativistic QCD while the environment is a weakly coupled quark-gluon
plasma in local thermal equilibrium below the melting temperature of the
quarkonium. Under the Markovian approximation, it is shown that the Lindblad
equation leads to a Boltzmann transport equation if a Wigner transform is
applied to the system density matrix. Our derivation illuminates how the
microscopic time-reversibility of QCD is consistent with the time-irreversible
in-medium evolution of quarkonium states. Static screening, dissociation and
recombination of quarkonium are treated in the same theoretical framework. In
addition, quarkonium annihilation is included in a similar way, although the
effect is negligible for the phenomenology of the current heavy ion collision
experiments. The methods used here can be extended to study quarkonium
dynamical evolution inside a strongly coupled QGP, a hot medium out of
equilibrium or cold nuclear matter, which is important to studying quarkonium
production in heavy ion, proton-ion, and electron-ion collisions.
| [
{
"created": "Fri, 16 Nov 2018 20:34:52 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2019 19:25:52 GMT",
"version": "v2"
},
{
"created": "Mon, 27 May 2019 20:54:44 GMT",
"version": "v3"
}
] | 2019-06-04 | [
[
"Yao",
"Xiaojun",
""
],
[
"Mehen",
"Thomas",
""
]
] | We use the open quantum system formalism to study the dynamical in-medium evolution of quarkonium. The system of quarkonium is described by potential non-relativistic QCD while the environment is a weakly coupled quark-gluon plasma in local thermal equilibrium below the melting temperature of the quarkonium. Under the Markovian approximation, it is shown that the Lindblad equation leads to a Boltzmann transport equation if a Wigner transform is applied to the system density matrix. Our derivation illuminates how the microscopic time-reversibility of QCD is consistent with the time-irreversible in-medium evolution of quarkonium states. Static screening, dissociation and recombination of quarkonium are treated in the same theoretical framework. In addition, quarkonium annihilation is included in a similar way, although the effect is negligible for the phenomenology of the current heavy ion collision experiments. The methods used here can be extended to study quarkonium dynamical evolution inside a strongly coupled QGP, a hot medium out of equilibrium or cold nuclear matter, which is important to studying quarkonium production in heavy ion, proton-ion, and electron-ion collisions. |
hep-ph/0110183 | Seung Woo | S.W. Ham, S.K. OH, D. Son | Possibility of spontaneous CP violation in the nonminimal supersymmetric
standard model with two neutral Higgs singlets | 18 pages, 3figures | Phys.Rev. D66 (2002) 015008 | 10.1103/PhysRevD.66.015008 | null | hep-ph | null | A supersymmetric standard model with two Higgs doublets and two Higgs
singlets is investigated if it can accommodate the possibility of spontaneous
CP violation. Assuming the degeneracy of the scalar quark masses of the third
generation, we find that spontaneous CP violation in the Higgs sector is viable
in our model. In the case of spontaneous CP violation, the masses of the
lightest two neutral Higgs bosons are estimated to be 80 and 125 GeV for some
parameter values in our model, which, are consistent with LEP2 data.
| [
{
"created": "Mon, 15 Oct 2001 09:36:34 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2002 02:14:41 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Ham",
"S. W.",
""
],
[
"OH",
"S. K.",
""
],
[
"Son",
"D.",
""
]
] | A supersymmetric standard model with two Higgs doublets and two Higgs singlets is investigated if it can accommodate the possibility of spontaneous CP violation. Assuming the degeneracy of the scalar quark masses of the third generation, we find that spontaneous CP violation in the Higgs sector is viable in our model. In the case of spontaneous CP violation, the masses of the lightest two neutral Higgs bosons are estimated to be 80 and 125 GeV for some parameter values in our model, which, are consistent with LEP2 data. |
hep-ph/9505252 | Steve Godfrey | Stephen Godfrey | Quartic Gauge Boson Couplings | Latex file uses aipbook.sty with revtex and psfig.sty. 4 figures
(uuencoded) will be added with figures command. Full postcript version with
embedded figures is available at
ftp://ftp.physics.carleton.ca/pub/theory/godfrey/ocipc9505.ps To appear in
the Proceedings of the International Symposium on Vector Boson
Self-Interactions, UCLA, Feb. 1-3, 1995 | null | 10.1063/1.49305 | OCIP/C-95-5 | hep-ph | null | Quartic vertices provide a window into one of the most important problems in
particle physics; the understanding of electroweak symmetry breaking. I survey
the various processes that have been proposed to study quartic gauge boson
couplings at future $e^+e^-$, $e\gamma$, $\gamma\gamma$, $e^-e^-$, and $pp$
colliders. For the lowest dimension operators that do not include photons, it
appears that the LHC will provide the most constraining measurements. However,
precision measurements at high energy $e^+e^-$ colliders involving $W^+W^-$
rescattering are also quite sensitive to the effects of a strongly interacting
weak interaction. For quartic couplings involving photons, $\gamma\gamma$
collisions appear to be the best place to measure these couplings. Measurements
using gauge boson production in $e\gamma$ collisions are almost as precise as
the $\gamma\gamma$ processes with $e^+e^-\to VVV$ about an order or magnitude
less sensitive.
| [
{
"created": "Mon, 8 May 1995 15:20:22 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Godfrey",
"Stephen",
""
]
] | Quartic vertices provide a window into one of the most important problems in particle physics; the understanding of electroweak symmetry breaking. I survey the various processes that have been proposed to study quartic gauge boson couplings at future $e^+e^-$, $e\gamma$, $\gamma\gamma$, $e^-e^-$, and $pp$ colliders. For the lowest dimension operators that do not include photons, it appears that the LHC will provide the most constraining measurements. However, precision measurements at high energy $e^+e^-$ colliders involving $W^+W^-$ rescattering are also quite sensitive to the effects of a strongly interacting weak interaction. For quartic couplings involving photons, $\gamma\gamma$ collisions appear to be the best place to measure these couplings. Measurements using gauge boson production in $e\gamma$ collisions are almost as precise as the $\gamma\gamma$ processes with $e^+e^-\to VVV$ about an order or magnitude less sensitive. |
2006.02218 | Subhadeep Mondal | Katri Huitu, Subhadeep Mondal, Biswarup Mukhopadhyaya | Probing heavy scalars with an effective $Hb\bar bg$ coupling at the LHC | 9 pages, 4 figures, 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have explored the prospect of probing a neutral scalar ($H$) produced in
association with one $b$-quark and decaying either invisibly or into a pair of
$b$-quarks at the LHC with centre of mass energy $\sqrt s = 14$ TeV. In this
regard, we adopt an effective theory approach to parameterize a $Hb\bar bg$
vertex arising from a dimension six operator that encompasses the effect of
some new physics setting in at a high scale. We concentrate solely on the
five-flavor scheme to ascertain the sensitivity of the 14 TeV LHC in probing
such an effective coupling as a function of the scalar mass at the highest
possible projected luminosity, $3000~{\rm fb}^{-1}$. Through our multivariate
analysis using machine learning algorithm we show that staying within the
perturbative limit of the Wilson coefficient of the effective interaction,
evidence with statistical significance of $3\sigma$ can be obtained in two
different signal regions for $m_H\lesssim 2$ TeV and the scale of new physics
$\Lambda = 3$ TeV.
| [
{
"created": "Wed, 3 Jun 2020 12:30:47 GMT",
"version": "v1"
}
] | 2020-06-04 | [
[
"Huitu",
"Katri",
""
],
[
"Mondal",
"Subhadeep",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | We have explored the prospect of probing a neutral scalar ($H$) produced in association with one $b$-quark and decaying either invisibly or into a pair of $b$-quarks at the LHC with centre of mass energy $\sqrt s = 14$ TeV. In this regard, we adopt an effective theory approach to parameterize a $Hb\bar bg$ vertex arising from a dimension six operator that encompasses the effect of some new physics setting in at a high scale. We concentrate solely on the five-flavor scheme to ascertain the sensitivity of the 14 TeV LHC in probing such an effective coupling as a function of the scalar mass at the highest possible projected luminosity, $3000~{\rm fb}^{-1}$. Through our multivariate analysis using machine learning algorithm we show that staying within the perturbative limit of the Wilson coefficient of the effective interaction, evidence with statistical significance of $3\sigma$ can be obtained in two different signal regions for $m_H\lesssim 2$ TeV and the scale of new physics $\Lambda = 3$ TeV. |
hep-ph/0607336 | Yue-Liang Wu | Yue-Liang Wu | Maximally Symmetric Minimal Unification Model SO(32) with Three Families
in Ten Dimensional Space-time | 17 pages, RevTex, published version with minor typos corrected | Mod.Phys.Lett.A22:259-272,2007 | 10.1142/S0217732307022591 | null | hep-ph hep-th | null | Based on a maximally symmetric minimal unification hypothesis and a quantum
charge-dimension correspondence principle, it is demonstrated that each family
of quarks and leptons belongs to the Majorana-Weyl spinor representation of
14-dimensions that relate to quantum spin-isospin-color charges. Families of
quarks and leptons attribute to a spinor structure of extra 6-dimensions that
relate to quantum family charges. Of particular, it is shown that 10-dimensions
relating to quantum spin-family charges form a motional 10-dimensional quantum
space-time with a generalized Lorentz symmetry SO(1,9), and 10-dimensions
relating to quantum isospin-color charges become a motionless 10-dimensional
quantum intrinsic space. Its corresponding 32-component fermions in the spinor
representation possess a maximal gauge symmetry SO(32). As a consequence, a
maximally symmetric minimal unification model SO(32) containing three families
in ten dimensional quantum space-time is naturally obtained by choosing a
suitable Majorana-Weyl spinor structure into which quarks and leptons are
directly embedded. Both resulting symmetry and dimensions coincide with the
ones of type I string and heterotic string SO(32) in string theory.
| [
{
"created": "Mon, 31 Jul 2006 04:27:34 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2006 06:47:07 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jan 2007 02:13:14 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Wu",
"Yue-Liang",
""
]
] | Based on a maximally symmetric minimal unification hypothesis and a quantum charge-dimension correspondence principle, it is demonstrated that each family of quarks and leptons belongs to the Majorana-Weyl spinor representation of 14-dimensions that relate to quantum spin-isospin-color charges. Families of quarks and leptons attribute to a spinor structure of extra 6-dimensions that relate to quantum family charges. Of particular, it is shown that 10-dimensions relating to quantum spin-family charges form a motional 10-dimensional quantum space-time with a generalized Lorentz symmetry SO(1,9), and 10-dimensions relating to quantum isospin-color charges become a motionless 10-dimensional quantum intrinsic space. Its corresponding 32-component fermions in the spinor representation possess a maximal gauge symmetry SO(32). As a consequence, a maximally symmetric minimal unification model SO(32) containing three families in ten dimensional quantum space-time is naturally obtained by choosing a suitable Majorana-Weyl spinor structure into which quarks and leptons are directly embedded. Both resulting symmetry and dimensions coincide with the ones of type I string and heterotic string SO(32) in string theory. |
2405.08316 | Yoshihiko Abe | Yoshihiko Abe, Komei Goto, Testutaro Higaki, Tatsuo Kobayashi, Kaito
Nasu | Moduli stabilization in finite modular symmetric models | 46 pages, 12 figures, 10 tables | null | null | EPHOU-24-005 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We study vacua of moduli potential consisting of multiple contribution of
modular forms in a finite modular symmetry. If the potential is given by a
single modular form, the Minkowski vacuum is realized at the fixed point of the
modular symmetry. We show that de Sitter vacuum is realized with a multiple
modular form case and obtain a non-trivial vacuum which is away from the fixed
point, i.e. a large modulus vacuum expectation value, depending on the choice
of the weight and representation of the modular forms. We study these vacua by
a numerical and analytically. It is also found that vacua obtained in this
paper preserve CP symmetry.
| [
{
"created": "Tue, 14 May 2024 04:49:05 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Abe",
"Yoshihiko",
""
],
[
"Goto",
"Komei",
""
],
[
"Higaki",
"Testutaro",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Nasu",
"Kaito",
""
]
] | We study vacua of moduli potential consisting of multiple contribution of modular forms in a finite modular symmetry. If the potential is given by a single modular form, the Minkowski vacuum is realized at the fixed point of the modular symmetry. We show that de Sitter vacuum is realized with a multiple modular form case and obtain a non-trivial vacuum which is away from the fixed point, i.e. a large modulus vacuum expectation value, depending on the choice of the weight and representation of the modular forms. We study these vacua by a numerical and analytically. It is also found that vacua obtained in this paper preserve CP symmetry. |
0810.3633 | Stephanie Trine | Stephanie Trine | Charged-Higgs effects in B --> (D) tau nu decays | 5 pages, parallel talk given at the 34th International Conference on
High Energy Physics (ICHEP08), 29 July - 5 August 2008, Philadelphia, USA | null | null | TTP08-48, SFB/CPP-08-87 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update and compare the capabilities of the purely leptonic mode B --> tau
nu and the semileptonic mode B --> D tau nu in the search for a charged Higgs
boson.
| [
{
"created": "Mon, 20 Oct 2008 19:03:17 GMT",
"version": "v1"
}
] | 2008-10-21 | [
[
"Trine",
"Stephanie",
""
]
] | We update and compare the capabilities of the purely leptonic mode B --> tau nu and the semileptonic mode B --> D tau nu in the search for a charged Higgs boson. |
1309.7605 | Wolfgang Lucha | Wolfgang Lucha, Dmitri Melikhov | Resolving the Puzzle of the Pion-Photon Transition Form Factor | 7 pages, 4 figures, talk presented at the European Physical Society
Conference on High Energy Physics - EPS-HEP2013, 18-24 July 2013, Stockholm,
Sweden | PoS EPS-HEP 2013 (2013) 445 | null | HEPHY-PUB 930/13 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the form factors for pseudoscalar-meson-photon transitions by
means of dispersive QCD sum rules and demonstrate that most of the measurements
done so far (in particular, those by BaBar for $\eta,$ $\eta',$ and $\eta_c$
and those by Belle for $\pi^0$) are, on the one hand, compatible with each
other and with the saturation required by factorization theorems obtained from
perturbative QCD and, on the other hand, give a hint that saturation is
effective already at relatively low momentum transfers $Q^2;$ this hypothesis
is supported by experimental data for the charged-pion elastic form factor
available in the range $Q^2\approx2-4\;\{GeV}^2.$ The only exception are the
BaBar results for the $\pi^0\gamma$ transition form factor, which do not fit
into such picture. We point out that results expected from SHMS at JLab on the
pion elastic form factor in the region $Q^2\approx5-8\;\{GeV}^2$ will provide
the ultimate test of saturation and factorization and strongly impact our
general view of the form factors up to infinitely large $Q^2.$
| [
{
"created": "Sun, 29 Sep 2013 15:09:57 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 2013 07:58:29 GMT",
"version": "v2"
}
] | 2014-04-15 | [
[
"Lucha",
"Wolfgang",
""
],
[
"Melikhov",
"Dmitri",
""
]
] | We investigate the form factors for pseudoscalar-meson-photon transitions by means of dispersive QCD sum rules and demonstrate that most of the measurements done so far (in particular, those by BaBar for $\eta,$ $\eta',$ and $\eta_c$ and those by Belle for $\pi^0$) are, on the one hand, compatible with each other and with the saturation required by factorization theorems obtained from perturbative QCD and, on the other hand, give a hint that saturation is effective already at relatively low momentum transfers $Q^2;$ this hypothesis is supported by experimental data for the charged-pion elastic form factor available in the range $Q^2\approx2-4\;\{GeV}^2.$ The only exception are the BaBar results for the $\pi^0\gamma$ transition form factor, which do not fit into such picture. We point out that results expected from SHMS at JLab on the pion elastic form factor in the region $Q^2\approx5-8\;\{GeV}^2$ will provide the ultimate test of saturation and factorization and strongly impact our general view of the form factors up to infinitely large $Q^2.$ |
1910.14281 | Jinhui Chen | Tianhao Shao, Jinhui Chen, Che Ming Ko, and Kai-Jia Sun | Probing QCD critical fluctuations from the yield ratio of strange
hadrons in relativistic heavy-ion collisions | 7 pages, 3 tables and 1 figure | Physics Letters B Volume 801, 10 February 2020, 135177 | 10.1016/j.physletb.2019.135177 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By analyzing the available data on strange hadrons in central Pb+Pb
collisions from the NA49 Collaboration at the Super Proton Synchrotron (SPS)
and in central Au+Au collisions from the STAR Collaboration at the Relativistic
Heavy-Ion Collider (RHIC) in a wide collision energy range from $\sqrt{s_{\rm
NN}}$ = 6.3 GeV to 200 GeV, we find a possible non-monotonic behavior in the
ratio $\mathcal{O}_\text{K-$\Xi$-$\phi$-$\Lambda$}$=
$\frac{N(K^+)N(\Xi^-)}{N(\phi)N(\Lambda)}$ of $K^+$, $\Xi^-$, $\phi$, and
$\Lambda$ yields as a function of $\sqrt{s_{\rm NN}}$. Based on the quark
coalescence model, which can take into account the effect of quark density
fluctuations on hadron production, a possible non-monotonic behavior in the
dependence of the strange quark density fluctuation on $\sqrt{s_{NN}}$ is
obtained. This is in contrast to the coalescence model that does not include
quark density fluctuations and also to the statistical hadronization model as
both fail to describe even qualitatively the collision energy dependence of the
ratio $\mathcal{O}_\text{K-$\Xi$-$\phi$-$\Lambda$}$. Our findings thus suggest
that the signal and location of a possible critical endpoint in the QCD phase
diagram, which is expected to result in large quark density fluctuations, can
be found in the on-going Bean Energy Scan program at RHIC.
| [
{
"created": "Thu, 31 Oct 2019 07:01:40 GMT",
"version": "v1"
}
] | 2020-01-09 | [
[
"Shao",
"Tianhao",
""
],
[
"Chen",
"Jinhui",
""
],
[
"Ko",
"Che Ming",
""
],
[
"Sun",
"Kai-Jia",
""
]
] | By analyzing the available data on strange hadrons in central Pb+Pb collisions from the NA49 Collaboration at the Super Proton Synchrotron (SPS) and in central Au+Au collisions from the STAR Collaboration at the Relativistic Heavy-Ion Collider (RHIC) in a wide collision energy range from $\sqrt{s_{\rm NN}}$ = 6.3 GeV to 200 GeV, we find a possible non-monotonic behavior in the ratio $\mathcal{O}_\text{K-$\Xi$-$\phi$-$\Lambda$}$= $\frac{N(K^+)N(\Xi^-)}{N(\phi)N(\Lambda)}$ of $K^+$, $\Xi^-$, $\phi$, and $\Lambda$ yields as a function of $\sqrt{s_{\rm NN}}$. Based on the quark coalescence model, which can take into account the effect of quark density fluctuations on hadron production, a possible non-monotonic behavior in the dependence of the strange quark density fluctuation on $\sqrt{s_{NN}}$ is obtained. This is in contrast to the coalescence model that does not include quark density fluctuations and also to the statistical hadronization model as both fail to describe even qualitatively the collision energy dependence of the ratio $\mathcal{O}_\text{K-$\Xi$-$\phi$-$\Lambda$}$. Our findings thus suggest that the signal and location of a possible critical endpoint in the QCD phase diagram, which is expected to result in large quark density fluctuations, can be found in the on-going Bean Energy Scan program at RHIC. |
1611.04813 | Francesco Giovanni Celiberto | Francesco Caporale, Francesco G. Celiberto, Grigorios Chachamis, David
Gordo Gomez, Agustin Sabio Vera | Inclusive three- and four-jet production in multi-Regge kinematics at
the LHC | 4 pages, 2 figures; presented by F.G. Celiberto at "Diffraction
2016", International Workshop on Diffraction in High-Energy Physics, Acireale
(Catania, Sicily), Sept. 2-8, 2016; to be published in the conference
proceedings by AIP | null | 10.1063/1.4977165 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A study of differential cross sections for the production of three and four
jets in multi-Regge kinematics is presented. The main focus lies on the
azimuthal angle dependences in events with two forward/backward jets are tagged
in the final state. Furthermore, the tagging of one or two extra jets in more
central regions of the detector with a relative separation in rapidity from
each other is requested. It is found that the dependence of the cross sections
on the transverse momenta and the rapidities of the central jet(s) can offer
new means of studying the onset of BFKL dynamics.
| [
{
"created": "Tue, 15 Nov 2016 13:04:09 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2016 19:05:49 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Jan 2017 16:47:12 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Mar 2017 15:00:52 GMT",
"version": "v4"
}
] | 2017-04-05 | [
[
"Caporale",
"Francesco",
""
],
[
"Celiberto",
"Francesco G.",
""
],
[
"Chachamis",
"Grigorios",
""
],
[
"Gomez",
"David Gordo",
""
],
[
"Vera",
"Agustin Sabio",
""
]
] | A study of differential cross sections for the production of three and four jets in multi-Regge kinematics is presented. The main focus lies on the azimuthal angle dependences in events with two forward/backward jets are tagged in the final state. Furthermore, the tagging of one or two extra jets in more central regions of the detector with a relative separation in rapidity from each other is requested. It is found that the dependence of the cross sections on the transverse momenta and the rapidities of the central jet(s) can offer new means of studying the onset of BFKL dynamics. |
2408.06466 | A. M. Fedotov | Y.V. Selivanov, A.M. Fedotov | Final multiplicity of a QED cascade in generalized Heitler model | 13 pages, 7 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a generalized Heitler model for QED cascade. An exact formula for
the final number of leptons is obtained by solving the kinetic equations. We
demonstrate that in such a model the final number of leptons does not depend on
photon and lepton free paths. We derive approximate formulas for the main
characteristics of cascades at high energy, including the final number of
leptons and the cascade depth. We show that in general the final number of
leptons is asymptotically proportional to the energy of seed particle. It is
also demonstrated how the original Heitler model is reproduced as a special
case.
| [
{
"created": "Mon, 12 Aug 2024 19:32:52 GMT",
"version": "v1"
}
] | 2024-08-14 | [
[
"Selivanov",
"Y. V.",
""
],
[
"Fedotov",
"A. M.",
""
]
] | We consider a generalized Heitler model for QED cascade. An exact formula for the final number of leptons is obtained by solving the kinetic equations. We demonstrate that in such a model the final number of leptons does not depend on photon and lepton free paths. We derive approximate formulas for the main characteristics of cascades at high energy, including the final number of leptons and the cascade depth. We show that in general the final number of leptons is asymptotically proportional to the energy of seed particle. It is also demonstrated how the original Heitler model is reproduced as a special case. |
hep-ph/0308132 | Alan Cornell | A. S. Cornell and Naveen Gaur | The Forward Backward asymmetries of $B \to X_s \tau^+ \tau^-$ in the
MSSM | 14 pages, 4 figures (5 eps files); modified to JHEP format, accepted
in JHEP, references added | JHEP 0309:030,2003 | 10.1088/1126-6708/2003/09/030 | null | hep-ph | null | The relatively clean theoretical probes of the Standard Model (SM), and the
various theories beyond the SM, provided by radiative, semi-leptonic and
(purely) leptonic decays of B-mesons have become increasingly important. Due to
the large number of possible distributions in the semi-leptonic decays based on
the quark level transition $b \to s \ell^+ \ell^-$ (not just the branching
ratio), these transitions have become very useful. A study of the
Forward-Backward asymmetries for the inclusive decay ($B \to X_s \ell^+
\ell^-$) is carried out in this paper. This study shall be performed in the SM
and a minimal supersymmetric extensions of the SM, namely the mSUGRA model.
| [
{
"created": "Tue, 12 Aug 2003 11:43:25 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Sep 2003 14:58:50 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Sep 2003 03:42:18 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Cornell",
"A. S.",
""
],
[
"Gaur",
"Naveen",
""
]
] | The relatively clean theoretical probes of the Standard Model (SM), and the various theories beyond the SM, provided by radiative, semi-leptonic and (purely) leptonic decays of B-mesons have become increasingly important. Due to the large number of possible distributions in the semi-leptonic decays based on the quark level transition $b \to s \ell^+ \ell^-$ (not just the branching ratio), these transitions have become very useful. A study of the Forward-Backward asymmetries for the inclusive decay ($B \to X_s \ell^+ \ell^-$) is carried out in this paper. This study shall be performed in the SM and a minimal supersymmetric extensions of the SM, namely the mSUGRA model. |
1801.09069 | Kenji Yamada | Kenji Yamada, Tomohito Maeda | Radiative decays of light-quark mesons to a pion revisited in the
covariant oscillator quark model | 6 pages, talk at the XVII International Conference on Hadron
Spectroscopy and Structure - Hadron2017, 25-29 September 2017, University of
Salamanca, Salamanca, Spain; v2: the numerical error corrected for $f_1
\rightarrow \rho \gamma$ in Case B of Table 1 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present talk consists of two parts. The first one is allocated for
consideration of the dimension of bilocal meson fields for quark-antiquark
meson systems, which have been so far treated as the bosonic fields independent
of constituent quark flavors, in the covariant oscillator quark model.
Revisiting the electromagnetic currents of quark-antiquark meson systems, we
show that the bilocal meson fields should be bosonic for light-quark meson
systems, while fermionic for heavy-light and heavy-heavy meson systems. In the
second part we apply the effective electromagnetic interactions of meson
systems derived in the first part to radiative decay processes for the excited
states of light-quark mesons. The calculated results for the $\pi \gamma$ decay
widths of the $a_1(1260)$, $a_2(1320)$, $b_1(1235)$ and $\pi_2(1670)$ mesons
are in fair agreement with experiment, except for the $b_1(1235)$ meson. As for
the $\rho(770)^0 \gamma$ decay width of the $f_1(1285)$ the present model
strongly supports the experimental results in 1995 and 2016, respectively, of
VES and CLAS Collaborations, not the average value by the Particle Data Group.
| [
{
"created": "Sat, 27 Jan 2018 10:49:43 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2019 09:17:42 GMT",
"version": "v2"
}
] | 2019-01-09 | [
[
"Yamada",
"Kenji",
""
],
[
"Maeda",
"Tomohito",
""
]
] | The present talk consists of two parts. The first one is allocated for consideration of the dimension of bilocal meson fields for quark-antiquark meson systems, which have been so far treated as the bosonic fields independent of constituent quark flavors, in the covariant oscillator quark model. Revisiting the electromagnetic currents of quark-antiquark meson systems, we show that the bilocal meson fields should be bosonic for light-quark meson systems, while fermionic for heavy-light and heavy-heavy meson systems. In the second part we apply the effective electromagnetic interactions of meson systems derived in the first part to radiative decay processes for the excited states of light-quark mesons. The calculated results for the $\pi \gamma$ decay widths of the $a_1(1260)$, $a_2(1320)$, $b_1(1235)$ and $\pi_2(1670)$ mesons are in fair agreement with experiment, except for the $b_1(1235)$ meson. As for the $\rho(770)^0 \gamma$ decay width of the $f_1(1285)$ the present model strongly supports the experimental results in 1995 and 2016, respectively, of VES and CLAS Collaborations, not the average value by the Particle Data Group. |
1905.03513 | Suman Kumbhakar | Suman Kumbhakar, Ashutosh Kumar Alok, Dinesh Kumar and S Uma Sankar | Resolving $R_D$ and $R_{D^*}$ anomalies | 4 pages, 2 figures, Contribution to proceedings of 16th Conference on
Flavor Physics and CP Violation (FPCP 2018), July 14-18, 2018, Hyderabad,
India | Springer Proc.Phys. 234 (2019) 473-477 | 10.1007/978-3-030-29622-3_65 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current world averages of the ratios $R_{D^{(*)}}$ are about $4\sigma$
away from their Standard Model prediction. These measurements indicate towards
the violation of lepton flavor universality in $b\rightarrow c\,l\,\bar{\nu}$
decay. The different new physics operators, which can explain the $R_{D^{(*)}}$
measurements, have been identified previously. We show that a simultaneous
measurement of the polarization fractions of $\tau$ and $D^*$ and the angular
asymmetries $A_{FB}$ and $A_{LT}$ in $B\rightarrow D^*\tau\bar{\nu}$ decay can
distinguish all the new physics amplitudes and hence uniquely identify the
Lorentz structure of new physics.
| [
{
"created": "Thu, 9 May 2019 10:02:54 GMT",
"version": "v1"
}
] | 2020-02-18 | [
[
"Kumbhakar",
"Suman",
""
],
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Kumar",
"Dinesh",
""
],
[
"Sankar",
"S Uma",
""
]
] | The current world averages of the ratios $R_{D^{(*)}}$ are about $4\sigma$ away from their Standard Model prediction. These measurements indicate towards the violation of lepton flavor universality in $b\rightarrow c\,l\,\bar{\nu}$ decay. The different new physics operators, which can explain the $R_{D^{(*)}}$ measurements, have been identified previously. We show that a simultaneous measurement of the polarization fractions of $\tau$ and $D^*$ and the angular asymmetries $A_{FB}$ and $A_{LT}$ in $B\rightarrow D^*\tau\bar{\nu}$ decay can distinguish all the new physics amplitudes and hence uniquely identify the Lorentz structure of new physics. |
1503.09140 | P. S. Bhupal Dev | P. S. Bhupal Dev and Apostolos Pilaftsis | Natural Standard Model Alignment in the Two Higgs Doublet Model | 15 pages, 1 table, 8 figures; Contribution to the Proceedings of
DISCRETE 2014, London | Journal of Physics: Conference Series 631 (2015) 012030 | 10.1088/1742-6596/631/1/012030 | MAN/HEP/2015/04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current LHC Higgs data provide strong constraints on possible deviations
of the couplings of the observed 125 GeV Higgs boson from the Standard Model
(SM) expectations. Therefore, it now becomes compelling that any extended Higgs
sector must comply with the so-called SM alignment limit. In the context of the
Two Higgs Doublet Model (2HDM), this alignment is often associated with either
decoupling of the heavy Higgs sector or accidental cancellations in the 2HDM
potential. Here we present a new solution realizing natural alignment based on
symmetries, without decoupling or fine-tuning. In particular, we show that in
2HDMs where both Higgs doublets acquire vacuum expectation values, there exist
only three different symmetry realizations leading to natural alignment. We
discuss some phenomenological implications of the Maximally-Symmetric 2HDM
based on SO(5) symmetry group and analyze new collider signals for the heavy
Higgs sector, involving third-generation quarks, which can be a useful
observational tool during the Run-II phase of the LHC.
| [
{
"created": "Tue, 31 Mar 2015 17:40:17 GMT",
"version": "v1"
}
] | 2015-08-03 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] | The current LHC Higgs data provide strong constraints on possible deviations of the couplings of the observed 125 GeV Higgs boson from the Standard Model (SM) expectations. Therefore, it now becomes compelling that any extended Higgs sector must comply with the so-called SM alignment limit. In the context of the Two Higgs Doublet Model (2HDM), this alignment is often associated with either decoupling of the heavy Higgs sector or accidental cancellations in the 2HDM potential. Here we present a new solution realizing natural alignment based on symmetries, without decoupling or fine-tuning. In particular, we show that in 2HDMs where both Higgs doublets acquire vacuum expectation values, there exist only three different symmetry realizations leading to natural alignment. We discuss some phenomenological implications of the Maximally-Symmetric 2HDM based on SO(5) symmetry group and analyze new collider signals for the heavy Higgs sector, involving third-generation quarks, which can be a useful observational tool during the Run-II phase of the LHC. |
0709.0110 | Alexander V. Kuznetsov | Alexander V. Kuznetsov and Nickolay V. Mikheev (Yaroslavl State (P.G.
Demidov) University, Russia) | New bounds on the neutrino magnetic moment from the plasma induced
neutrino chirality flip in a supernova | 19 pages, LaTeX, 7 EPS figures, submitted to Journal of Cosmology and
Astroparticle Physics | JCAP 0711:031,2007 | 10.1088/1475-7516/2007/11/031 | YARU-HE-07/03 | hep-ph | null | The neutrino chirality-flip process under the conditions of the supernova
core is investigated in detail with the plasma polarization effects in the
photon propagator taken into account, in a more consistent way than in earlier
publications. It is shown in part that the contribution of the proton fraction
of plasma is essential. New upper bounds on the neutrino magnetic moment are
obtained: mu_nu < (0.5 - 1.1) 10^{-12} mu_B from the limit on the supernova
core luminosity for nu_R emission, and mu_nu < (0.4 - 0.6) 10^{-12} mu_B from
the limit on the averaged time of the neutrino spin-flip. The best upper bound
on the neutrino magnetic moment from SN1987A is improved by the factor of 3 to
7.
| [
{
"created": "Sun, 2 Sep 2007 15:26:49 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Kuznetsov",
"Alexander V.",
"",
"Yaroslavl State"
],
[
"Mikheev",
"Nickolay V.",
"",
"Yaroslavl State"
]
] | The neutrino chirality-flip process under the conditions of the supernova core is investigated in detail with the plasma polarization effects in the photon propagator taken into account, in a more consistent way than in earlier publications. It is shown in part that the contribution of the proton fraction of plasma is essential. New upper bounds on the neutrino magnetic moment are obtained: mu_nu < (0.5 - 1.1) 10^{-12} mu_B from the limit on the supernova core luminosity for nu_R emission, and mu_nu < (0.4 - 0.6) 10^{-12} mu_B from the limit on the averaged time of the neutrino spin-flip. The best upper bound on the neutrino magnetic moment from SN1987A is improved by the factor of 3 to 7. |
1808.00466 | David M. Straub | Jason Aebischer, Christoph Bobeth, Andrzej J. Buras, David M. Straub | Anatomy of $\varepsilon'/\varepsilon$ beyond the Standard Model | 47 pages, 4 figures. v3: signs in tables 6-10 corrected, numerical
results and conclusions unchanged | null | 10.1140/epjc/s10052-019-6715-6 | TUM-HEP-1153/18, AJB-18-7 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present for the first time a model-independent anatomy of the ratio
$\varepsilon'/\varepsilon$ in the context of the $\Delta S = 1$ effective
theory with operators invariant under QCD and QED and in the context of the
Standard Model Effective Field Theory (SMEFT) with the operators invariant
under the full SM gauge group. Our goal is to identify the new physics
scenarios that are probed by this ratio and which could help to explain a
possible deviation from the SM that is hinted by the data. To this end we
derive a master formula for $\varepsilon'/\varepsilon$, which can be applied to
any theory beyond the Standard Model (BSM) in which the Wilson coefficients of
all contributing operators have been calculated at the electroweak scale. The
relevant hadronic matrix elements of BSM operators are from the Dual QCD
approach and the SM ones from lattice QCD. Within SMEFT, the constraints from
$K^0$ and $D^0$ mixing as well as electric dipole moments limit significantly
potential new physics contributions to $\varepsilon'/\varepsilon$. Correlations
of $\varepsilon'/\varepsilon$ with $K\to\pi\nu\bar\nu$ decays are briefly
discussed. Building on our EFT analysis and the model-independent constraints,
we discuss implications of a possible deviation from the SM in
$\varepsilon'/\varepsilon$ for model building, highlighting the role of the new
scalar and tensor matrix elements in models with scalar mediators.
| [
{
"created": "Wed, 1 Aug 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Mar 2019 17:41:58 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Aug 2019 08:55:17 GMT",
"version": "v3"
}
] | 2019-08-08 | [
[
"Aebischer",
"Jason",
""
],
[
"Bobeth",
"Christoph",
""
],
[
"Buras",
"Andrzej J.",
""
],
[
"Straub",
"David M.",
""
]
] | We present for the first time a model-independent anatomy of the ratio $\varepsilon'/\varepsilon$ in the context of the $\Delta S = 1$ effective theory with operators invariant under QCD and QED and in the context of the Standard Model Effective Field Theory (SMEFT) with the operators invariant under the full SM gauge group. Our goal is to identify the new physics scenarios that are probed by this ratio and which could help to explain a possible deviation from the SM that is hinted by the data. To this end we derive a master formula for $\varepsilon'/\varepsilon$, which can be applied to any theory beyond the Standard Model (BSM) in which the Wilson coefficients of all contributing operators have been calculated at the electroweak scale. The relevant hadronic matrix elements of BSM operators are from the Dual QCD approach and the SM ones from lattice QCD. Within SMEFT, the constraints from $K^0$ and $D^0$ mixing as well as electric dipole moments limit significantly potential new physics contributions to $\varepsilon'/\varepsilon$. Correlations of $\varepsilon'/\varepsilon$ with $K\to\pi\nu\bar\nu$ decays are briefly discussed. Building on our EFT analysis and the model-independent constraints, we discuss implications of a possible deviation from the SM in $\varepsilon'/\varepsilon$ for model building, highlighting the role of the new scalar and tensor matrix elements in models with scalar mediators. |
1505.06336 | Gernot Eichmann | Gernot Eichmann, Christian S. Fischer, Walter Heupel | Four-point functions and the permutation group S4 | 23 pages, 9 figures, 5 tables | Phys. Rev. D 92, 056006 (2015) | 10.1103/PhysRevD.92.056006 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Four-point functions are at the heart of many interesting physical processes.
A prime example is the light-by-light scattering amplitude, which plays an
important role in the calculation of hadronic contributions to the anomalous
magnetic moment of the muon. In the calculation of such quantities one faces
the challenge of finding a suitable and well-behaved basis of tensor structures
in coordinate and/or momentum space. Provided all (or many) of the external
legs represent similar particle content, a powerful tool to construct and
organize such bases is the permutation group S4. We introduce an efficient
notation for dealing with the irreducible multiplets of S4, and we highlight
the merits of this treatment by exemplifying four-point functions with
gauge-boson legs such as the four-gluon vertex and the light-by-light
scattering amplitude. The multiplet analysis is also useful for isolating the
important kinematic regions and the dynamical singularity content of such
amplitudes. Our analysis serves as a basis for future efficient calculations of
these and similar objects.
| [
{
"created": "Sat, 23 May 2015 14:16:47 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Eichmann",
"Gernot",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Heupel",
"Walter",
""
]
] | Four-point functions are at the heart of many interesting physical processes. A prime example is the light-by-light scattering amplitude, which plays an important role in the calculation of hadronic contributions to the anomalous magnetic moment of the muon. In the calculation of such quantities one faces the challenge of finding a suitable and well-behaved basis of tensor structures in coordinate and/or momentum space. Provided all (or many) of the external legs represent similar particle content, a powerful tool to construct and organize such bases is the permutation group S4. We introduce an efficient notation for dealing with the irreducible multiplets of S4, and we highlight the merits of this treatment by exemplifying four-point functions with gauge-boson legs such as the four-gluon vertex and the light-by-light scattering amplitude. The multiplet analysis is also useful for isolating the important kinematic regions and the dynamical singularity content of such amplitudes. Our analysis serves as a basis for future efficient calculations of these and similar objects. |
2002.07496 | Dmitry Kirpichnikov | D. V. Kirpichnikov, Valery E. Lyubovitskij, Alexey S. Zhevlakov | Implication of the hidden sub-GeV bosons for the $(g-2)_\mu$,
$^8$Be-$^4$He anomaly, proton charge radius, EDM of fermions and dark axion
portal | 12 pages, 4 figures, version accepted for publication in PRD | null | 10.1103/PhysRevD.102.095024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss new physics phenomenology of hidden scalar ($S$), pseudoscalar
($P$), vector ($V$) and axial-vector ($A$) particles coupled to nucleons and
leptons, which could give contributions to proton charge radius, $(g-2)_\mu$,
$^8$Be-$^4$He anomaly and electric dipole moment (EDM) of Standard Model (SM)
particles. In particular, we estimate sensitivity of NA64$\mu$ experiment to
observe muon missing energy events involving hidden scalar and vector
particles. That analysis is based on {\tt GEANT4} Monte Carlo simulation of the
signal process of muon scattering off target nuclei $\mu N \to \mu N S(V)$
followed by invisible boson decay into Dark Matter (DM) particles, $S(V)\to
\chi \chi$. The existence of light sub-GeV bosons could possibly explain the
muon $(g-2)$ anomaly observed. We also summarize existing bounds on ATOMKI
$X17(J^P=0^-, 1^\pm)$ boson coupling with neutron, proton and electron. We
implement these constraints to estimate the contribution of $P$, $V$ and $A$
particles to proton charge radius via direct 1-loop calculation of Sachs form
factors. The analysis reveals the corresponding contribution is negligible. We
also calculate bounds on dark axion portal couplings of dimension-five
operators, which contribute to the EDMs of leptons and neutron.
| [
{
"created": "Tue, 18 Feb 2020 11:30:24 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Nov 2020 11:38:13 GMT",
"version": "v2"
}
] | 2020-12-30 | [
[
"Kirpichnikov",
"D. V.",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Zhevlakov",
"Alexey S.",
""
]
] | We discuss new physics phenomenology of hidden scalar ($S$), pseudoscalar ($P$), vector ($V$) and axial-vector ($A$) particles coupled to nucleons and leptons, which could give contributions to proton charge radius, $(g-2)_\mu$, $^8$Be-$^4$He anomaly and electric dipole moment (EDM) of Standard Model (SM) particles. In particular, we estimate sensitivity of NA64$\mu$ experiment to observe muon missing energy events involving hidden scalar and vector particles. That analysis is based on {\tt GEANT4} Monte Carlo simulation of the signal process of muon scattering off target nuclei $\mu N \to \mu N S(V)$ followed by invisible boson decay into Dark Matter (DM) particles, $S(V)\to \chi \chi$. The existence of light sub-GeV bosons could possibly explain the muon $(g-2)$ anomaly observed. We also summarize existing bounds on ATOMKI $X17(J^P=0^-, 1^\pm)$ boson coupling with neutron, proton and electron. We implement these constraints to estimate the contribution of $P$, $V$ and $A$ particles to proton charge radius via direct 1-loop calculation of Sachs form factors. The analysis reveals the corresponding contribution is negligible. We also calculate bounds on dark axion portal couplings of dimension-five operators, which contribute to the EDMs of leptons and neutron. |
1910.05267 | Mikhail Galynskii | M.V. Galynskii | On the Measurement of Sachs Form Factors in Processes without and with
Proton Spin Flip | 6 pages, 1 figure | JETP Lett. 109 (2019) no.1, 1-7, Pisma Zh.Eksp.Teor.Fiz. 109
(2019) no.1, 3-9 | 10.1134/S0021364019010089 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The physical meaning of the decomposition of the Rosenbluth formula into two
terms containing only squares of Sachs form factors has been established. A new
method has been proposed for their independent measurement in the $e \vec{p}
\to e \vec{p}$ elastic process when the initial proton at rest is fully
polarized along the direction of motion of the final proton.
| [
{
"created": "Fri, 11 Oct 2019 16:00:34 GMT",
"version": "v1"
}
] | 2019-10-14 | [
[
"Galynskii",
"M. V.",
""
]
] | The physical meaning of the decomposition of the Rosenbluth formula into two terms containing only squares of Sachs form factors has been established. A new method has been proposed for their independent measurement in the $e \vec{p} \to e \vec{p}$ elastic process when the initial proton at rest is fully polarized along the direction of motion of the final proton. |
hep-ph/0311310 | Yuval Grossman | Yuval Grossman and Subhendu Rakshit | Neutrino masses in R-parity violating supersymmetric models | 18 pages; minor typos corrected. To be published in Physical Review D | Phys.Rev. D69 (2004) 093002 | 10.1103/PhysRevD.69.093002 | SLAC-PUB-10253 | hep-ph | null | We study neutrino masses and mixing in R-parity violating supersymmetric
models with generic soft supersymmetry breaking terms. Neutrinos acquire masses
from various sources: Tree level neutrino--neutralino mixing and loop effects
proportional to bilinear and/or trilinear R-parity violating parameters. Each
of these contributions is controlled by different parameters and have different
suppression or enhancement factors which we identified. Within an Abelian
horizontal symmetry framework these factors are related and specific
predictions can be made. We found that the main contributions to the neutrino
masses are from the tree level and the bilinear loops and that the observed
neutrino data can be accommodated once mild fine-tuning is allowed.
| [
{
"created": "Mon, 24 Nov 2003 20:59:44 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2003 18:55:00 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Feb 2004 15:14:06 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Grossman",
"Yuval",
""
],
[
"Rakshit",
"Subhendu",
""
]
] | We study neutrino masses and mixing in R-parity violating supersymmetric models with generic soft supersymmetry breaking terms. Neutrinos acquire masses from various sources: Tree level neutrino--neutralino mixing and loop effects proportional to bilinear and/or trilinear R-parity violating parameters. Each of these contributions is controlled by different parameters and have different suppression or enhancement factors which we identified. Within an Abelian horizontal symmetry framework these factors are related and specific predictions can be made. We found that the main contributions to the neutrino masses are from the tree level and the bilinear loops and that the observed neutrino data can be accommodated once mild fine-tuning is allowed. |
1005.1577 | Sergio Campos | S.D. Campos | Phenomenological Analysis of $pp$ and $\bar{p}p$ Elastic Scattering Data
in the Impact Parameter Space | 15 pages, 16 figures | Int.J.Mod.Phys.A25:1937-1950,2010 | 10.1142/S0217751X10048354 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use an almost model-independent analytical parameterization for $pp$ and
$\bar{p}p$ elastic scattering data to analyze the eikonal, profile, and
inelastic overlap functions in the impact parameter space. Error propagation in
the fit parameters allows estimations of uncertainty regions, improving the
geometrical description of the hadron-hadron interaction. Several predictions
are shown and, in particular, the prediction for $pp$ inelastic overlap
function at $\sqrt{s}=14$ TeV shows the saturation of the Froissart-Martin
bound at LHC energies.
| [
{
"created": "Mon, 10 May 2010 15:09:13 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Campos",
"S. D.",
""
]
] | We use an almost model-independent analytical parameterization for $pp$ and $\bar{p}p$ elastic scattering data to analyze the eikonal, profile, and inelastic overlap functions in the impact parameter space. Error propagation in the fit parameters allows estimations of uncertainty regions, improving the geometrical description of the hadron-hadron interaction. Several predictions are shown and, in particular, the prediction for $pp$ inelastic overlap function at $\sqrt{s}=14$ TeV shows the saturation of the Froissart-Martin bound at LHC energies. |
2110.01685 | Einan Gardi | Einan Gardi, Mark Harley, Rebecca Lodin, Martina Palusa, Jennifer M.
Smillie, Chris D. White and Stephanie Yeomans | Boomerang webs up to three-loop order | 78 pages | null | 10.1007/JHEP12(2021)018 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Webs are sets of Feynman diagrams which manifest soft gluon exponentiation in
gauge theory scattering amplitudes: individual webs contribute to the logarithm
of the amplitude and their ultraviolet renormalization encodes its infrared
structure. In this paper, we consider the particular class of boomerang webs,
consisting of multiple gluon exchanges, but where at least one gluon has both
of its endpoints on the same Wilson line. First, we use the replica trick to
prove that diagrams involving self-energy insertions along the Wilson line do
not contribute to the web, i.e. their exponentiated colour factor vanishes.
Consequently boomerang webs effectively involve only integrals where boomerang
gluons straddle one or more gluons that connect to other Wilson lines. Next we
classify and calculate all boomerang webs involving semi-infinite non-lightlike
Wilson lines up to three-loop order, including a detailed discussion of how to
regulate and renormalize them. Furthermore, we show that they can be written
using a basis of specific harmonic polylogarithms, that has been conjectured to
be sufficient for expressing all multiple gluon exchange webs. However,
boomerang webs differ from other gluon-exchange webs by featuring a lower and
non-uniform transcendental weight. We cross-check our results by showing how
certain boomerang webs can be determined by the so-called collinear reduction
of previously calculated webs. Our results are a necessary ingredient of the
soft anomalous dimension for non-lightlike Wilson lines at three loops.
| [
{
"created": "Mon, 4 Oct 2021 19:38:33 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Gardi",
"Einan",
""
],
[
"Harley",
"Mark",
""
],
[
"Lodin",
"Rebecca",
""
],
[
"Palusa",
"Martina",
""
],
[
"Smillie",
"Jennifer M.",
""
],
[
"White",
"Chris D.",
""
],
[
"Yeomans",
"Stephanie",
""
]
] | Webs are sets of Feynman diagrams which manifest soft gluon exponentiation in gauge theory scattering amplitudes: individual webs contribute to the logarithm of the amplitude and their ultraviolet renormalization encodes its infrared structure. In this paper, we consider the particular class of boomerang webs, consisting of multiple gluon exchanges, but where at least one gluon has both of its endpoints on the same Wilson line. First, we use the replica trick to prove that diagrams involving self-energy insertions along the Wilson line do not contribute to the web, i.e. their exponentiated colour factor vanishes. Consequently boomerang webs effectively involve only integrals where boomerang gluons straddle one or more gluons that connect to other Wilson lines. Next we classify and calculate all boomerang webs involving semi-infinite non-lightlike Wilson lines up to three-loop order, including a detailed discussion of how to regulate and renormalize them. Furthermore, we show that they can be written using a basis of specific harmonic polylogarithms, that has been conjectured to be sufficient for expressing all multiple gluon exchange webs. However, boomerang webs differ from other gluon-exchange webs by featuring a lower and non-uniform transcendental weight. We cross-check our results by showing how certain boomerang webs can be determined by the so-called collinear reduction of previously calculated webs. Our results are a necessary ingredient of the soft anomalous dimension for non-lightlike Wilson lines at three loops. |
1811.12888 | Emmanuel de Oliveira | Mateus Reinke Pelicer, Emmanuel G. de Oliveira, Roman Pasechnik | Exclusive heavy quark-pair production in ultraperipheral collisions | 21 pages, 18 figures, improved conclusion | Phys. Rev. D 99, 034016 (2019) | 10.1103/PhysRevD.99.034016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the fully differential observables of exclusive
production of heavy (charm and bottom) quark pairs in high-energy
ultraperipheral $pA$ and $AA$ collisions. In these processes, the nucleus $A$
serves as an efficient source of the photon flux, while the QCD interaction of
the produced heavy-quark pair with the target ($p$ or $A$) proceeds via an
exchange of gluons in a color singlet state, described by the gluon Wigner
distribution. The corresponding predictions for differential cross sections
were obtained by using the dipole $S$-matrix in the McLerran--Venugopalan
saturation model with impact parameter dependence for the nucleus target, and
its recent generalization, for the proton target. Prospects of experimental
constraints on the gluon Wigner distribution in this class of reactions are
discussed.
| [
{
"created": "Fri, 30 Nov 2018 16:56:16 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Feb 2019 18:22:44 GMT",
"version": "v2"
}
] | 2019-02-27 | [
[
"Pelicer",
"Mateus Reinke",
""
],
[
"de Oliveira",
"Emmanuel G.",
""
],
[
"Pasechnik",
"Roman",
""
]
] | In this article, we study the fully differential observables of exclusive production of heavy (charm and bottom) quark pairs in high-energy ultraperipheral $pA$ and $AA$ collisions. In these processes, the nucleus $A$ serves as an efficient source of the photon flux, while the QCD interaction of the produced heavy-quark pair with the target ($p$ or $A$) proceeds via an exchange of gluons in a color singlet state, described by the gluon Wigner distribution. The corresponding predictions for differential cross sections were obtained by using the dipole $S$-matrix in the McLerran--Venugopalan saturation model with impact parameter dependence for the nucleus target, and its recent generalization, for the proton target. Prospects of experimental constraints on the gluon Wigner distribution in this class of reactions are discussed. |
hep-ph/0110116 | Mario Ivan Martinez | M. I. Martinez and G. Herrera (Mexico, IPN) | Dalitz plot slope parameters for $K \to \pi\pi\pi$ decays and two
particle interference | 17 pages, LaTex2e, 6 figures, v2 authors' affiliation modified, to
appear in Mod. Phys. Lett. A | Mod.Phys.Lett. A16 (2001) 2197-2206 | 10.1142/S0217732301005151 | null | hep-ph | null | We study the possible distortion of phase-space in the decays $K \to \pi \pi
\pi$, which may result from final state interference among the decay products.
Such distortion may influence the values of slope parameters extracted from the
Dalitz plot distribution of these decays. We comment on the consequences on the
magnitude of violation of the $\mid \Delta I \mid = 1/2$ rule in these decays.
| [
{
"created": "Tue, 9 Oct 2001 00:02:44 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2001 01:23:47 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Martinez",
"M. I.",
"",
"Mexico, IPN"
],
[
"Herrera",
"G.",
"",
"Mexico, IPN"
]
] | We study the possible distortion of phase-space in the decays $K \to \pi \pi \pi$, which may result from final state interference among the decay products. Such distortion may influence the values of slope parameters extracted from the Dalitz plot distribution of these decays. We comment on the consequences on the magnitude of violation of the $\mid \Delta I \mid = 1/2$ rule in these decays. |
1512.05357 | Ben Stefanek | Yang Bai, Ran Lu, Sida Lu, Jordi Salvado and Ben A. Stefanek | Three Twin Neutrinos: Evidence from LSND and MiniBooNE | null | Phys. Rev. D 93, 073004 (2016) | 10.1103/PhysRevD.93.073004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a neutrino model of three twin neutrinos in light of the
neutrino appearance excesses at LSND and MiniBooNE. The model, which includes a
twin parity, naturally predicts identical lepton Yukawa structures in the
Standard Model and the twin sectors. As a result, a universal mixing angle
controls all three twin neutrino couplings to the Standard Model charged
leptons. This mixing angle is predicted to be the ratio of the electroweak
scale over the composite scale of the Higgs boson and has the right order of
magnitude to fit the data. The heavy twin neutrinos decay within the
experimental lengths into active neutrinos plus a long-lived Majoron and can
provide a good fit, at around $4\sigma$ confidence level, to the LSND and
MiniBooNE appearance data while simultaneously satisfying the disappearance
constraints. For the Majorana neutrino case, the fact that neutrinos have a
larger scattering cross section than anti-neutrinos provides a natural
explanation to MiniBooNE's observation of a larger anti-neutrino appearance
excess.
| [
{
"created": "Wed, 16 Dec 2015 21:00:05 GMT",
"version": "v1"
}
] | 2016-04-13 | [
[
"Bai",
"Yang",
""
],
[
"Lu",
"Ran",
""
],
[
"Lu",
"Sida",
""
],
[
"Salvado",
"Jordi",
""
],
[
"Stefanek",
"Ben A.",
""
]
] | We construct a neutrino model of three twin neutrinos in light of the neutrino appearance excesses at LSND and MiniBooNE. The model, which includes a twin parity, naturally predicts identical lepton Yukawa structures in the Standard Model and the twin sectors. As a result, a universal mixing angle controls all three twin neutrino couplings to the Standard Model charged leptons. This mixing angle is predicted to be the ratio of the electroweak scale over the composite scale of the Higgs boson and has the right order of magnitude to fit the data. The heavy twin neutrinos decay within the experimental lengths into active neutrinos plus a long-lived Majoron and can provide a good fit, at around $4\sigma$ confidence level, to the LSND and MiniBooNE appearance data while simultaneously satisfying the disappearance constraints. For the Majorana neutrino case, the fact that neutrinos have a larger scattering cross section than anti-neutrinos provides a natural explanation to MiniBooNE's observation of a larger anti-neutrino appearance excess. |
hep-ph/9406271 | Shoji Hashimoto | Shoji Hashimoto, Jiro Kodaira, Yoshiaki Yasui and Ken Sasaki | The Background Field Method: Alternative Way of Deriving the Pinch
Technique's Results | 32 pages in LaTeX including 8 figures using epsf.sty,
uuencoded-compressed-tar format | Phys.Rev. D50 (1994) 7066-7076 | 10.1103/PhysRevD.50.7066 | HUPD-9408, YNU-HEPTh-94-104 | hep-ph | null | We show that the background field method (BFM) is a simple way of deriving
the same gauge-invariant results which are obtained by the pinch technique
(PT). For illustration we construct gauge-invariant self-energy and three-point
vertices for gluons at one-loop level by BFM and demonstrate that we get the
same results which were derived via PT. We also calculate the four-gluon vertex
in BFM and show that this vertex obeys the same Ward identity that was found
with PT.}
| [
{
"created": "Fri, 10 Jun 1994 06:32:23 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Hashimoto",
"Shoji",
""
],
[
"Kodaira",
"Jiro",
""
],
[
"Yasui",
"Yoshiaki",
""
],
[
"Sasaki",
"Ken",
""
]
] | We show that the background field method (BFM) is a simple way of deriving the same gauge-invariant results which are obtained by the pinch technique (PT). For illustration we construct gauge-invariant self-energy and three-point vertices for gluons at one-loop level by BFM and demonstrate that we get the same results which were derived via PT. We also calculate the four-gluon vertex in BFM and show that this vertex obeys the same Ward identity that was found with PT.} |
1605.08850 | Dremin | I.M. Dremin, V.A. Nechitailo | Asymmetric vector mesons produced in nuclear collisions | 11 pages, 2 Figures. arXiv admin note: text overlap with
arXiv:1505.06297 | null | 10.1140/epja/i2016-16288-5 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is argued that the experimentally observed phenomenon of asymmetric shapes
of vector mesons produced in nuclear media during high energy nucleus-nucleus
collisions can be explained as Fano-Feshbach resonances. It has been observed
that the mass distributions of lepton pairs created at meson decays decline
from the traditional Breit-Wigner shape with some excess in the low-mass wing
of the resonance. It is clear that the whole phenomenon is related to some
interaction with the nuclear medium. Moreover, it can be further detalized in
quantum mechanics as the interference of direct and continuum states in
Fano-Feshbach effect. To reveal the nature of the interaction it is proposed to
use a phenomenological model of the additional contribution due to Cherenkov
gluons. They can be created because of the excess of the refractivity index
over 1 just in the low-mass wing as required by the classical Cherenkov
treatment. In quantum mechanics, this requirement is related to the positive
real part of the interaction amplitude in this wing. The corresponding
parameters are found from the comparison with $\rho $-meson data and admit
reasonable explanation.
| [
{
"created": "Sat, 28 May 2016 06:34:58 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Dremin",
"I. M.",
""
],
[
"Nechitailo",
"V. A.",
""
]
] | It is argued that the experimentally observed phenomenon of asymmetric shapes of vector mesons produced in nuclear media during high energy nucleus-nucleus collisions can be explained as Fano-Feshbach resonances. It has been observed that the mass distributions of lepton pairs created at meson decays decline from the traditional Breit-Wigner shape with some excess in the low-mass wing of the resonance. It is clear that the whole phenomenon is related to some interaction with the nuclear medium. Moreover, it can be further detalized in quantum mechanics as the interference of direct and continuum states in Fano-Feshbach effect. To reveal the nature of the interaction it is proposed to use a phenomenological model of the additional contribution due to Cherenkov gluons. They can be created because of the excess of the refractivity index over 1 just in the low-mass wing as required by the classical Cherenkov treatment. In quantum mechanics, this requirement is related to the positive real part of the interaction amplitude in this wing. The corresponding parameters are found from the comparison with $\rho $-meson data and admit reasonable explanation. |
1103.4570 | Thomas Schwetz | Joachim Kopp, Michele Maltoni, Thomas Schwetz | Are there sterile neutrinos at the eV scale? | 5 pages, 5 figures, v2: reference and acknowledgements added | Phys.Rev.Lett.107:091801,2011 | 10.1103/PhysRevLett.107.091801 | FERMILAB-PUB-11-064-T, IFT-UAM/CSIC-11-12, EURONU-WP6-11-31 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New predictions for the anti-neutrino flux emitted by nuclear reactors
suggest that reactor experiments may have measured a deficit in the
anti-neutrino flux, which can be interpreted in terms of oscillations between
the known active neutrinos and new sterile states. Motivated by this
observation, we perform a re-analysis of global short-baseline neutrino
oscillation data in a framework with one or two sterile neutrinos. While one
sterile neutrino is still not sufficient to reconcile the signals suggested by
reactor experiments and by the LSND and MiniBooNE experiments with null results
from other searches, we find that, with the new reactor flux prediction, the
global fit improves considerably when the existence of two sterile neutrinos is
assumed.
| [
{
"created": "Wed, 23 Mar 2011 16:18:48 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2011 15:50:50 GMT",
"version": "v2"
}
] | 2011-09-29 | [
[
"Kopp",
"Joachim",
""
],
[
"Maltoni",
"Michele",
""
],
[
"Schwetz",
"Thomas",
""
]
] | New predictions for the anti-neutrino flux emitted by nuclear reactors suggest that reactor experiments may have measured a deficit in the anti-neutrino flux, which can be interpreted in terms of oscillations between the known active neutrinos and new sterile states. Motivated by this observation, we perform a re-analysis of global short-baseline neutrino oscillation data in a framework with one or two sterile neutrinos. While one sterile neutrino is still not sufficient to reconcile the signals suggested by reactor experiments and by the LSND and MiniBooNE experiments with null results from other searches, we find that, with the new reactor flux prediction, the global fit improves considerably when the existence of two sterile neutrinos is assumed. |
1003.4997 | Zack Sullivan | Zack Sullivan and Edmond L. Berger | Isolated leptons from heavy flavor decays: Theory and data | 12 pg, revtex, 5 fig, corrected typos | Phys.Rev.D82:014001,2010 | 10.1103/PhysRevD.82.014001 | IIT-CAPP-10-01, ANL-HEP-PR-10-10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Events with isolated leptons play a prominent role in signatures of new
physics phenomena at high energy collider physics facilities. In earlier
publications, we examine the standard model contribution to isolated lepton
production from bottom and charm mesons and baryons through their semileptonic
decays (b, c -> l + X), showing that this source can overwhelm the effects of
other standard model processes in some kinematic domains. In this paper, we
show that we obtain good agreement with recent Tevatron collider data, both
validating our simulations and showing that we underestimate the magnitude of
the heavy-flavor contribution to the isolated lepton yields. We also show that
the isolation requirement acts as a narrow bandpass filter on the momentum of
the isolated lepton, and we illustrate the effect of this filter on the
background to Higgs boson observation in the dilepton mode. We introduce and
justify a new rule of thumb: isolated electrons and muons from heavy flavor
decay are produced with roughly the same distributions as b and c quarks, but
with 1/200 times the rates of b and c production, respectively.
| [
{
"created": "Thu, 25 Mar 2010 20:27:07 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 2010 20:55:37 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Jul 2010 15:33:07 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Sullivan",
"Zack",
""
],
[
"Berger",
"Edmond L.",
""
]
] | Events with isolated leptons play a prominent role in signatures of new physics phenomena at high energy collider physics facilities. In earlier publications, we examine the standard model contribution to isolated lepton production from bottom and charm mesons and baryons through their semileptonic decays (b, c -> l + X), showing that this source can overwhelm the effects of other standard model processes in some kinematic domains. In this paper, we show that we obtain good agreement with recent Tevatron collider data, both validating our simulations and showing that we underestimate the magnitude of the heavy-flavor contribution to the isolated lepton yields. We also show that the isolation requirement acts as a narrow bandpass filter on the momentum of the isolated lepton, and we illustrate the effect of this filter on the background to Higgs boson observation in the dilepton mode. We introduce and justify a new rule of thumb: isolated electrons and muons from heavy flavor decay are produced with roughly the same distributions as b and c quarks, but with 1/200 times the rates of b and c production, respectively. |
2402.02914 | Upalaparna Banerjee | Upalaparna Banerjee, Sabyasachi Chakraborty, Suraj Prakash, and
Shakeel Ur Rahaman | The feasibility of ultra-relativistic bubbles in SMEFT | 17 pages, 5 figures, 2 tables, added discussion on the impact of
dimension 8 interactions, bibliography updated | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | A first order electroweak phase transition probes physics beyond the Standard
Model on multiple frontiers and therefore is of immense interest for
theoretical exploration. We conduct a model-independent study of the effects of
relevant dimension 6 operators, of the Standard Model Effective Field Theory,
on electroweak phase transition. We use a thermally corrected and
renormalization group improved potential and study its impact on nucleation
temperature. We then outline bubble dynamics that lead to ultra-relativistic
bubble wall velocities which are mainly motivated from the viewpoint of
gravitational wave detection. We highlight the ranges of the Wilson
coefficients that give rise to such bubble wall velocities and predict
gravitational wave spectra generated by such transitions which can be tested in
future experiments. The low new physics scale necessitates the inclusion of
dimension 8 contributions. We also quantify their impact on ultra-relativistic
bubble wall dynamics.
| [
{
"created": "Mon, 5 Feb 2024 11:30:04 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2024 05:56:07 GMT",
"version": "v2"
}
] | 2024-03-11 | [
[
"Banerjee",
"Upalaparna",
""
],
[
"Chakraborty",
"Sabyasachi",
""
],
[
"Prakash",
"Suraj",
""
],
[
"Rahaman",
"Shakeel Ur",
""
]
] | A first order electroweak phase transition probes physics beyond the Standard Model on multiple frontiers and therefore is of immense interest for theoretical exploration. We conduct a model-independent study of the effects of relevant dimension 6 operators, of the Standard Model Effective Field Theory, on electroweak phase transition. We use a thermally corrected and renormalization group improved potential and study its impact on nucleation temperature. We then outline bubble dynamics that lead to ultra-relativistic bubble wall velocities which are mainly motivated from the viewpoint of gravitational wave detection. We highlight the ranges of the Wilson coefficients that give rise to such bubble wall velocities and predict gravitational wave spectra generated by such transitions which can be tested in future experiments. The low new physics scale necessitates the inclusion of dimension 8 contributions. We also quantify their impact on ultra-relativistic bubble wall dynamics. |
1108.0284 | Balasubramanian Ananthanarayan | B. Ananthanarayan, I. Caprini, I. Sentitemsu Imsong | Implications of unitarity and analyticity for the D\pi form factors | 10 pages, 7 figures, uses EPJ style files: expanded version of v1
with extended discussion, additional analysis, explanation, figure and
references; corresponds to EPJA version | Eur. Phys. J. A (2011) 47: 147 | 10.1140/epja/i2011-11147-7 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the vector and scalar form factors of the charm-changing current
responsible for the semileptonic decay D\rightarrow \pi l \nu. Using as input
dispersion relations and unitarity for the moments of suitable heavy-light
correlators evaluated with Operator Product Expansions, including O(\alpha_s^2)
terms in perturbative QCD, we constrain the shape parameters of the form
factors and find exclusion regions for zeros on the real axis and in the
complex plane. For the scalar form factor, a low energy theorem and phase
information on the unitarity cut are also implemented to further constrain the
shape parameters. We finally propose new analytic expressions for the $D\pi$
form factors, derive constraints on the relevant coefficients from unitarity
and analyticity, and briefly discuss the usefulness of the new parametrizations
for describing semileptonic data.
| [
{
"created": "Mon, 1 Aug 2011 11:34:03 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2011 13:11:06 GMT",
"version": "v2"
}
] | 2011-11-24 | [
[
"Ananthanarayan",
"B.",
""
],
[
"Caprini",
"I.",
""
],
[
"Imsong",
"I. Sentitemsu",
""
]
] | We consider the vector and scalar form factors of the charm-changing current responsible for the semileptonic decay D\rightarrow \pi l \nu. Using as input dispersion relations and unitarity for the moments of suitable heavy-light correlators evaluated with Operator Product Expansions, including O(\alpha_s^2) terms in perturbative QCD, we constrain the shape parameters of the form factors and find exclusion regions for zeros on the real axis and in the complex plane. For the scalar form factor, a low energy theorem and phase information on the unitarity cut are also implemented to further constrain the shape parameters. We finally propose new analytic expressions for the $D\pi$ form factors, derive constraints on the relevant coefficients from unitarity and analyticity, and briefly discuss the usefulness of the new parametrizations for describing semileptonic data. |
hep-ph/9308327 | Herbert Weigel | R. Alkofer and H. Weigel | $1/N_C$ Corrections to $g_A$ in the Light of PCAC$ | 8 pages LaTeX, 1 figure , UNITU-THEP-9/1993 | Phys.Lett.B319:1-6,1993 | 10.1016/0370-2693(93)90771-9 | null | hep-ph | null | We comment on recently discovered $1/N_C$ corrections to the ` nucleon axial
current in the framework of the Nambu--Jona-Lasinio soliton. This kind of
corrections arises only for a special treatment of ordering ambiguities of
collective coordinates and operators in the semiclassical quantization. In
addition to the missing derivation of this special quantization scheme from
first principles its na\"\i ve application violates partial conservation of the
axial current (PCAC). We show how within this scheme PCAC can be restored and
determine the corresponding $1/N_C$ corrections to the equation of motion for
the chiral soliton. The resulting self-consistent solution allows to evaluate
the nucleon axial coupling constant $g_A$ directly as a matrix element of the
axial current as well as indirectly from the pion profile function. Enhancement
is found for those baryon properties which are sensitive to the long range
behavior of the pion profile.
| [
{
"created": "Tue, 24 Aug 1993 12:04:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alkofer",
"R.",
""
],
[
"Weigel",
"H.",
""
]
] | We comment on recently discovered $1/N_C$ corrections to the ` nucleon axial current in the framework of the Nambu--Jona-Lasinio soliton. This kind of corrections arises only for a special treatment of ordering ambiguities of collective coordinates and operators in the semiclassical quantization. In addition to the missing derivation of this special quantization scheme from first principles its na\"\i ve application violates partial conservation of the axial current (PCAC). We show how within this scheme PCAC can be restored and determine the corresponding $1/N_C$ corrections to the equation of motion for the chiral soliton. The resulting self-consistent solution allows to evaluate the nucleon axial coupling constant $g_A$ directly as a matrix element of the axial current as well as indirectly from the pion profile function. Enhancement is found for those baryon properties which are sensitive to the long range behavior of the pion profile. |
hep-ph/9611320 | Zoltan Fodor | F. Csikor and Z. Fodor | Determining the beta-function of the strong interaction and closing the
light gluino window | 6 pages, Latex, 3 eps figures included. Recently calculated
three-loop calculations and some new experimental results are included in the
analysis | Phys.Rev.Lett.78:4335-4338,1997 | 10.1103/PhysRevLett.78.4335 | CERN-TH/96-323, ITP-Budapest 522 | hep-ph hep-ex | null | We discuss the perturbative running of alpha_s in a model independent way.
Our analysis contains data on the hadronic tau decay and hadronic cross
sections in e+e- annihilation between 5 GeV and M_Z. We determine the color
coefficients and the perturbative beta-function of the strong interaction. The
results are in agreement with QCD and rule out the QCD+light gluino scenarios
on the 70.8 - 93.0% CL. We combine our method with that of the multi-jet
analysis at LEP. The combined result rules out light gluinos at least on the
99.76% CL, provided that nonperturbative effects are not large.
| [
{
"created": "Wed, 13 Nov 1996 20:13:02 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Nov 1996 15:54:49 GMT",
"version": "v2"
},
{
"created": "Thu, 15 May 1997 09:14:48 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Csikor",
"F.",
""
],
[
"Fodor",
"Z.",
""
]
] | We discuss the perturbative running of alpha_s in a model independent way. Our analysis contains data on the hadronic tau decay and hadronic cross sections in e+e- annihilation between 5 GeV and M_Z. We determine the color coefficients and the perturbative beta-function of the strong interaction. The results are in agreement with QCD and rule out the QCD+light gluino scenarios on the 70.8 - 93.0% CL. We combine our method with that of the multi-jet analysis at LEP. The combined result rules out light gluinos at least on the 99.76% CL, provided that nonperturbative effects are not large. |
1809.06300 | Robbert Rietkerk | Kirill Melnikov, Robbert Rietkerk, Lorenzo Tancredi and Christopher
Wever | Double-real contribution to the quark beam function at N$^{3}$LO QCD | 28 pages, 1 figure; updated ancillary file (accessible through url in
the section "Results") | null | 10.1007/JHEP02(2019)159 | CERN-TH-2018-205, TTP18-034 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the master integrals required for the calculation of the
double-real emission contributions to the matching coefficients of 0-jettiness
beam functions at next-to-next-to-next-to-leading order in perturbative QCD. As
an application, we combine these integrals and derive the double-real gluon
emission contribution to the matching coefficient $I_{qq}(t,z)$ of the quark
beam function.
| [
{
"created": "Mon, 17 Sep 2018 16:05:41 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2019 16:38:14 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Oct 2019 14:33:04 GMT",
"version": "v3"
}
] | 2019-10-24 | [
[
"Melnikov",
"Kirill",
""
],
[
"Rietkerk",
"Robbert",
""
],
[
"Tancredi",
"Lorenzo",
""
],
[
"Wever",
"Christopher",
""
]
] | We compute the master integrals required for the calculation of the double-real emission contributions to the matching coefficients of 0-jettiness beam functions at next-to-next-to-next-to-leading order in perturbative QCD. As an application, we combine these integrals and derive the double-real gluon emission contribution to the matching coefficient $I_{qq}(t,z)$ of the quark beam function. |
1312.5849 | Balasubramanian Ananthanarayan | B.Ananthanarayan, Irinel Caprini, Diganta Das, I. Sentitemsu Imsong | Two-pion low-energy contribution to the muon $g-2$ with improved
precision from analyticity and unitarity | 10 pages latex, using revtex, 5 figures; v2 corresponds to version to
appear in Physical Review D; references added; discussions improved | Phys. Rev. D 89, 036007 (2014) | 10.1103/PhysRevD.89.036007 | SI-HEP-2013-16, DO-TH 13/35, QFET-2013-13 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-pion contribution from low energies to the muon magnetic moment
anomaly, although small, has a large relative uncertainty since in this region
the experimental data on the cross sections are neither sufficient nor precise
enough. It is therefore of interest to see whether the precision can be
improved by means of additional theoretical information on the pion
electromagnetic form factor, which controls the leading order contribution. In
the present paper we address this problem by exploiting analyticity and
unitarity of the form factor in a parametrization-free approach that uses the
phase in the elastic region, known with high precision from the Fermi-Watson
theorem and Roy equations for $\pi\pi$ elastic scattering as input. The
formalism also includes experimental measurements on the modulus in the region
0.65-0.70 GeV, taken from the most recent $e^+e^-\to \pi^+\pi^-$ experiments,
and recent measurements of the form factor on the spacelike axis. By combining
the results obtained with inputs from CMD2, SND, BABAR and KLOE, we make the
predictions $a_\mu^{\pi\pi, \LO}\,[2 m_\pi,\, 0.30 \gev]=(0.553 \pm 0.004)
\times 10^{-10}$ and $a_\mu^{\pi\pi, \LO}\,[0.30 \gev,\, 0.63 \gev]=(133. 083
\pm 0.837)\times 10^{-10}$. These are consistent with the other recent
determinations, and have slightly smaller errors.
| [
{
"created": "Fri, 20 Dec 2013 08:37:20 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Feb 2014 03:59:18 GMT",
"version": "v2"
}
] | 2014-02-24 | [
[
"Ananthanarayan",
"B.",
""
],
[
"Caprini",
"Irinel",
""
],
[
"Das",
"Diganta",
""
],
[
"Imsong",
"I. Sentitemsu",
""
]
] | The two-pion contribution from low energies to the muon magnetic moment anomaly, although small, has a large relative uncertainty since in this region the experimental data on the cross sections are neither sufficient nor precise enough. It is therefore of interest to see whether the precision can be improved by means of additional theoretical information on the pion electromagnetic form factor, which controls the leading order contribution. In the present paper we address this problem by exploiting analyticity and unitarity of the form factor in a parametrization-free approach that uses the phase in the elastic region, known with high precision from the Fermi-Watson theorem and Roy equations for $\pi\pi$ elastic scattering as input. The formalism also includes experimental measurements on the modulus in the region 0.65-0.70 GeV, taken from the most recent $e^+e^-\to \pi^+\pi^-$ experiments, and recent measurements of the form factor on the spacelike axis. By combining the results obtained with inputs from CMD2, SND, BABAR and KLOE, we make the predictions $a_\mu^{\pi\pi, \LO}\,[2 m_\pi,\, 0.30 \gev]=(0.553 \pm 0.004) \times 10^{-10}$ and $a_\mu^{\pi\pi, \LO}\,[0.30 \gev,\, 0.63 \gev]=(133. 083 \pm 0.837)\times 10^{-10}$. These are consistent with the other recent determinations, and have slightly smaller errors. |
1209.0478 | A. H. Rezaeian | Amir H. Rezaeian | Semi-inclusive photon-hadron production in pp and pA collisions at RHIC
and LHC | 16 pages, 20 figures; v2: latex Compilation problem in Figs. 3,4
corrected | Phys.Rev.D86:094016,2012 | 10.1103/PhysRevD.86.094016 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate semi-inclusive photon-hadron production in the color glass
condensate (CGC) framework at RHIC and the LHC energies in proton-proton (pp)
and proton-nucleus (pA) collisions. We calculate the coincidence probability
for azimuthal correlation of pairs of photon-hadron and show that the away-side
correlations have a double-peak or a single-peak structure depending on trigger
particle selection and kinematics. This novel feature is unique for
semi-inclusive photon-hadron production compared to a similar measurement for
double inclusive dihadron production in pA collisions. We obtain necessary
conditions between kinematics variables for the appearance of a double-peak or
a single peak structure for the away-side photon-hadron correlations in pp and
pA collisions at forward rapidities and show that this feature is mainly
controlled by the ratio p_T^hadron/p_T^photon. Decorrelation of away-side
photon-hadron production by increasing the energy, rapidity and density, and
appearance of double-peak structure can be understood by QCD saturation
physics. We also provide predictions for the ratio of single inclusive prompt
photon to hadron production, and two-dimensional nuclear modification factor
for the semi-inclusive photon-hadron pair production at RHIC and the LHC at
forward rapidities.
| [
{
"created": "Mon, 3 Sep 2012 20:11:41 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2012 14:20:01 GMT",
"version": "v2"
}
] | 2012-11-07 | [
[
"Rezaeian",
"Amir H.",
""
]
] | We investigate semi-inclusive photon-hadron production in the color glass condensate (CGC) framework at RHIC and the LHC energies in proton-proton (pp) and proton-nucleus (pA) collisions. We calculate the coincidence probability for azimuthal correlation of pairs of photon-hadron and show that the away-side correlations have a double-peak or a single-peak structure depending on trigger particle selection and kinematics. This novel feature is unique for semi-inclusive photon-hadron production compared to a similar measurement for double inclusive dihadron production in pA collisions. We obtain necessary conditions between kinematics variables for the appearance of a double-peak or a single peak structure for the away-side photon-hadron correlations in pp and pA collisions at forward rapidities and show that this feature is mainly controlled by the ratio p_T^hadron/p_T^photon. Decorrelation of away-side photon-hadron production by increasing the energy, rapidity and density, and appearance of double-peak structure can be understood by QCD saturation physics. We also provide predictions for the ratio of single inclusive prompt photon to hadron production, and two-dimensional nuclear modification factor for the semi-inclusive photon-hadron pair production at RHIC and the LHC at forward rapidities. |
hep-ph/9708249 | null | R. Arnowitt and Pran Nath | Non-Universality Effects and Dark Matter in Gravity Mediated SUSY
Breaking | LaTeX 7 pages,4 figures, requires espcrc2.sty available from
http://dept.physics.upenn.edu | Nucl.Phys.Proc.Suppl.62:241-247,1998 | 10.1016/S0920-5632(97)00663-4 | null | hep-ph | null | Dark matter detection rates for supergravity models with R parity where
supersymmetry is broken at a scale >~M_G are discussed. Non-universal soft
breaking masses in both the Higgs and squark sectors are considered, and it is
seen that these can effect rates by a factor of 10-100 when m_X <~ 65 GeV
(X=lightest neutralino) but otherwise make relatively small corrections. The
b->s+\gamma branching ratio is seen to correlate with detector event rates,
large (small) branching ratios corresponding to small (large) event rates.
Effects of precision determinations of cosmological parameters or event rate
predictions by future satellite experiments are discussed for the LCDM and the
vCDM models.
| [
{
"created": "Tue, 5 Aug 1997 17:40:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arnowitt",
"R.",
""
],
[
"Nath",
"Pran",
""
]
] | Dark matter detection rates for supergravity models with R parity where supersymmetry is broken at a scale >~M_G are discussed. Non-universal soft breaking masses in both the Higgs and squark sectors are considered, and it is seen that these can effect rates by a factor of 10-100 when m_X <~ 65 GeV (X=lightest neutralino) but otherwise make relatively small corrections. The b->s+\gamma branching ratio is seen to correlate with detector event rates, large (small) branching ratios corresponding to small (large) event rates. Effects of precision determinations of cosmological parameters or event rate predictions by future satellite experiments are discussed for the LCDM and the vCDM models. |
1704.00965 | Masaaki Kuroda | M. Kuroda and D. Schildknecht | Color Dipole picture at Low-x DIS: The Mass Range of Active Photon
Fluctuations | 5 pages, 3 figure., Minor changed of sentences and Appendix A and B
added | Phys. Rev. D 96, 094013 (2017) | 10.1103/PhysRevD.96.094013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the mass range of the quark-antiquark fluctuations of the
photon that are active in producing the total photoabsorption cross section in
the color dipole picture, emphasizing the notion of color transparency and
saturation. We consider the implications of measurements at future extensions
of the available electron-proton-scattering energy.
| [
{
"created": "Tue, 4 Apr 2017 11:40:58 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2017 13:20:41 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Oct 2017 01:08:38 GMT",
"version": "v3"
}
] | 2017-11-22 | [
[
"Kuroda",
"M.",
""
],
[
"Schildknecht",
"D.",
""
]
] | We investigate the mass range of the quark-antiquark fluctuations of the photon that are active in producing the total photoabsorption cross section in the color dipole picture, emphasizing the notion of color transparency and saturation. We consider the implications of measurements at future extensions of the available electron-proton-scattering energy. |
2405.20925 | Ioannis Gialamas | Ioannis D. Gialamas, Timo J. K\"arkk\"ainen, Luca Marzola | Generalized uncertainty principle and neutrino phenomenology | 9 pages, matches published version | null | null | null | hep-ph gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Generalized uncertainty principles are effective changes to the Heisenberg
uncertainty principle that emerge in several quantum gravity models. In the
present letter, we study the consequences that two classes of these
modifications yield on the physics of neutrinos. Besides analyzing the change
in the oscillation probabilities that the generalized uncertainty principles
entail, we assess their impact on the neutrino coherence length and their
possible interpretation as nonstandard neutrino interactions. Constraints cast
by present and planned neutrino experiments on the generalized uncertainty
principles parameters are also derived.
| [
{
"created": "Fri, 31 May 2024 15:27:02 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2024 11:53:12 GMT",
"version": "v2"
}
] | 2024-07-19 | [
[
"Gialamas",
"Ioannis D.",
""
],
[
"Kärkkäinen",
"Timo J.",
""
],
[
"Marzola",
"Luca",
""
]
] | Generalized uncertainty principles are effective changes to the Heisenberg uncertainty principle that emerge in several quantum gravity models. In the present letter, we study the consequences that two classes of these modifications yield on the physics of neutrinos. Besides analyzing the change in the oscillation probabilities that the generalized uncertainty principles entail, we assess their impact on the neutrino coherence length and their possible interpretation as nonstandard neutrino interactions. Constraints cast by present and planned neutrino experiments on the generalized uncertainty principles parameters are also derived. |
0805.1677 | Apostolos Pilaftsis | Apostolos Pilaftsis | Electroweak Resonant Leptogenesis in the Singlet Majoron Model | 28 pages, 4 figures, references and clarifications added, to appear
in Physical Review D | Phys.Rev.D78:013008,2008 | 10.1103/PhysRevD.78.013008 | MAN/HEP/2008/09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study resonant leptogenesis at the electroweak phase transition in the
singlet Majoron model with right-handed neutrinos. We consider a scenario,
where the SM gauge group and the lepton number break down spontaneously during
a second-order electroweak phase transition. We calculate the flavour- and
temperature-dependent leptonic asymmetries, by including the novel
contributions from the transverse polarisations of the W+/- and Z bosons. The
required resummation of the gauge-dependent off-shell heavy-neutrino
self-energies is consistently treated within the gauge-invariant framework of
the Pinch Technique. Taking into consideration the freeze-out dynamics of
sphalerons, we delineate the parameter space of the model that is compatible
with successful electroweak resonant leptogenesis. The phenomenological and
astrophysical implications of the model are discussed.
| [
{
"created": "Mon, 12 May 2008 16:20:19 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jun 2008 15:31:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pilaftsis",
"Apostolos",
""
]
] | We study resonant leptogenesis at the electroweak phase transition in the singlet Majoron model with right-handed neutrinos. We consider a scenario, where the SM gauge group and the lepton number break down spontaneously during a second-order electroweak phase transition. We calculate the flavour- and temperature-dependent leptonic asymmetries, by including the novel contributions from the transverse polarisations of the W+/- and Z bosons. The required resummation of the gauge-dependent off-shell heavy-neutrino self-energies is consistently treated within the gauge-invariant framework of the Pinch Technique. Taking into consideration the freeze-out dynamics of sphalerons, we delineate the parameter space of the model that is compatible with successful electroweak resonant leptogenesis. The phenomenological and astrophysical implications of the model are discussed. |
2112.02341 | Arunima Bhattacharya Ms. | Arunima Bhattacharya, M. C. Kumar, Prakash Mathews and V. Ravindran | Next to SV resummed prediction for pseudoscalar Higgs boson production
at NNLO$+\overline{\text{NNLL}}$ | 29 pages, 8 figures, 3 tables | null | 10.1103/PhysRevD.105.116015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present first results on the resummation of Next-to-Soft Virtual (NSV)
logarithms for the threshold production of pseudoscalar Higgs boson through
gluon fusion at the LHC. These results are presented after resumming the NSV
logarithms of the kind ${\log}^{i}(1-z)$ to $\overline{\text{NNLL}}$ accuracy
and matching them systematically to the fixed order NNLO cross-sections. These
results are obtained using collinear factorization, renormalization group
invariance and recent developments in the NSV resummation techniques. The
phenomenological implications of these NSV resummed results for 13 TeV LHC are
studied and it is observed that these NSV logarithms are quite large. We also
evaluate theory uncertainties and find that the renormalization scale
uncertainties get reduced further with the inclusion of NSV corrections at
various orders in QCD. We further study the impact of QCD corrections on mixed
scalar-pseudoscalar states for different values of the mixing angle $\alpha$.
| [
{
"created": "Sat, 4 Dec 2021 14:03:17 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Apr 2022 06:04:02 GMT",
"version": "v2"
}
] | 2022-06-22 | [
[
"Bhattacharya",
"Arunima",
""
],
[
"Kumar",
"M. C.",
""
],
[
"Mathews",
"Prakash",
""
],
[
"Ravindran",
"V.",
""
]
] | We present first results on the resummation of Next-to-Soft Virtual (NSV) logarithms for the threshold production of pseudoscalar Higgs boson through gluon fusion at the LHC. These results are presented after resumming the NSV logarithms of the kind ${\log}^{i}(1-z)$ to $\overline{\text{NNLL}}$ accuracy and matching them systematically to the fixed order NNLO cross-sections. These results are obtained using collinear factorization, renormalization group invariance and recent developments in the NSV resummation techniques. The phenomenological implications of these NSV resummed results for 13 TeV LHC are studied and it is observed that these NSV logarithms are quite large. We also evaluate theory uncertainties and find that the renormalization scale uncertainties get reduced further with the inclusion of NSV corrections at various orders in QCD. We further study the impact of QCD corrections on mixed scalar-pseudoscalar states for different values of the mixing angle $\alpha$. |
1611.04593 | Pedro Machado | Dorival Goncalves, Pedro A. N. Machado, Jose Miguel No | Simplified Models for Dark Matter Face their Consistent Completions | 7 pages, 7 figures | Phys. Rev. D 95, 055027 (2017) | 10.1103/PhysRevD.95.055027 | IPPP/16/114, PITT-PACC-1613, FERMILAB-PUB-16-510-T,
KCL-PH-TH/2016-61 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simplified dark matter models have been recently advocated as a powerful tool
to exploit the complementarity between dark matter direct detection, indirect
detection and LHC experimental probes. Focusing on pseudoscalar mediators
between the dark and visible sectors, we show that the simplified dark matter
model phenomenology departs significantly from that of consistent
${SU(2)_{\mathrm{L}} \times U(1)_{\mathrm{Y}}}$ gauge invariant completions. We
discuss the key physics simplified models fail to capture, and its impact on
LHC searches. Notably, we show that resonant mono-Z searches provide
competitive sensitivities to standard mono-jet analyses at $13$ TeV LHC.
| [
{
"created": "Mon, 14 Nov 2016 21:00:01 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Goncalves",
"Dorival",
""
],
[
"Machado",
"Pedro A. N.",
""
],
[
"No",
"Jose Miguel",
""
]
] | Simplified dark matter models have been recently advocated as a powerful tool to exploit the complementarity between dark matter direct detection, indirect detection and LHC experimental probes. Focusing on pseudoscalar mediators between the dark and visible sectors, we show that the simplified dark matter model phenomenology departs significantly from that of consistent ${SU(2)_{\mathrm{L}} \times U(1)_{\mathrm{Y}}}$ gauge invariant completions. We discuss the key physics simplified models fail to capture, and its impact on LHC searches. Notably, we show that resonant mono-Z searches provide competitive sensitivities to standard mono-jet analyses at $13$ TeV LHC. |
hep-ph/0211281 | Guy D. Moore | Guy D. Moore | Transport Coefficients at Leading Order: Kinetic Theory versus Diagrams | 10 pages, 8 figures, to appear in the proceedings of SEWM2002 | null | 10.1142/9789812704498_0014 | null | hep-ph | null | I review what is required to compute transport coefficients in
ultra-relativistic, weakly coupled gauge theories, at leading order in $g$,
using kinetic theory. Then I discuss how the calculation would look in
alternative approaches: the 2PI method, and direct diagrammatic analysis. I
argue that the 2PI method may be a good way to derive the kinetic theory, but
is not very useful directly (in a gauge theory). The diagrammatic approach is
almost hopeless.
| [
{
"created": "Mon, 18 Nov 2002 17:58:30 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Moore",
"Guy D.",
""
]
] | I review what is required to compute transport coefficients in ultra-relativistic, weakly coupled gauge theories, at leading order in $g$, using kinetic theory. Then I discuss how the calculation would look in alternative approaches: the 2PI method, and direct diagrammatic analysis. I argue that the 2PI method may be a good way to derive the kinetic theory, but is not very useful directly (in a gauge theory). The diagrammatic approach is almost hopeless. |
1707.02137 | Gong-Ming Yu | Gong-Ming Yu and Jian-Song Wang | Studies of the hydrodynamic evolution of the dense baryonic matter
produced in relativistic heavy ion collisions | 5 pages,5 figures,1 table | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the relativistic perfect-fluid hydrodynamics to describe the
space-time evolution of dense baryonic matter produced in the central
nucleus-nucleus collisions at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD, and
RHIC-BES. The transverse flow of the fireball with cylindrical symmetry and
boost invariant along the longitudinal direction is also analyzed. Based on the
relativistic kinetic theory, we also present the first preliminary calculation
on the production of low-mass dileptons and low-pT photons can be considered as
the signals of the dense baryonic matter produced in the central Au-Au and U-U
collisions. We find that the rapid cooling of the expanding dense baryonic
matter with transverse flow effect can lead to the suppression of the low-mass
dileptons and low-pT photons production at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD,
and RHIC-BES energies.
| [
{
"created": "Fri, 7 Jul 2017 12:11:33 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2017 01:50:00 GMT",
"version": "v2"
}
] | 2017-07-11 | [
[
"Yu",
"Gong-Ming",
""
],
[
"Wang",
"Jian-Song",
""
]
] | We use the relativistic perfect-fluid hydrodynamics to describe the space-time evolution of dense baryonic matter produced in the central nucleus-nucleus collisions at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD, and RHIC-BES. The transverse flow of the fireball with cylindrical symmetry and boost invariant along the longitudinal direction is also analyzed. Based on the relativistic kinetic theory, we also present the first preliminary calculation on the production of low-mass dileptons and low-pT photons can be considered as the signals of the dense baryonic matter produced in the central Au-Au and U-U collisions. We find that the rapid cooling of the expanding dense baryonic matter with transverse flow effect can lead to the suppression of the low-mass dileptons and low-pT photons production at HIRFL-CSR, HIAF, FAIR-CBM, NICA-MPD, and RHIC-BES energies. |
1103.2781 | Carlos Quimbay | Y. F. Perez, C. J. Quimbay | Majorana neutrino oscillations in vacuum | 25 pages, abstract changed, two sections added, some references added | Journal of Modern Physics, 2012, 3, 803-814 | 10.4236/jmp.2012.38105 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of a type I seesaw scenario which leads to get light
left-handed and heavy right-handed Majorana neutrinos, we obtain expressions
for the transition probability densities between two flavor neutrinos in the
cases of left-handed and right-handed neutrinos. We obtain these expressions in
the context of an approach developed in the canonical formalism of Quantum
Field Theory for neutrinos which are considered as superpositions of
mass-eigenstate plane waves with specific momenta. The expressions obtained for
the left-handed neutrino case after the ultra-relativistic limit is taking lead
to the standard probability densities which describe light neutrino
oscillations. For the right-handed neutrino case, the expressions describing
heavy neutrino oscillations in the non-relativistic limit are different respect
to the ones of the standard neutrino oscillations. However, the right-handed
neutrino oscillations are phenomenologically restricted as is shown when the
propagation of heavy neutrinos is considered as superpositions of
mass-eigenstate wave packets.
| [
{
"created": "Mon, 14 Mar 2011 20:37:33 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2011 14:22:04 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Aug 2011 12:08:22 GMT",
"version": "v3"
},
{
"created": "Tue, 14 Feb 2012 11:11:51 GMT",
"version": "v4"
},
{
"c... | 2015-05-27 | [
[
"Perez",
"Y. F.",
""
],
[
"Quimbay",
"C. J.",
""
]
] | In the context of a type I seesaw scenario which leads to get light left-handed and heavy right-handed Majorana neutrinos, we obtain expressions for the transition probability densities between two flavor neutrinos in the cases of left-handed and right-handed neutrinos. We obtain these expressions in the context of an approach developed in the canonical formalism of Quantum Field Theory for neutrinos which are considered as superpositions of mass-eigenstate plane waves with specific momenta. The expressions obtained for the left-handed neutrino case after the ultra-relativistic limit is taking lead to the standard probability densities which describe light neutrino oscillations. For the right-handed neutrino case, the expressions describing heavy neutrino oscillations in the non-relativistic limit are different respect to the ones of the standard neutrino oscillations. However, the right-handed neutrino oscillations are phenomenologically restricted as is shown when the propagation of heavy neutrinos is considered as superpositions of mass-eigenstate wave packets. |
1506.09093 | Roberto Pittau | Ben Page, Roberto Pittau | Two-loop off-shell QCD amplitudes in FDR | 25 pages, 6 figures | JHEP 1511 (2015) 183 | 10.1007/JHEP11(2015)183 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We link the FDR treatment of ultraviolet (UV) divergences to dimensional
regularization up to two loops in QCD. This allows us to derive the one-loop
and two-loop coupling constant and quark mass shifts necessary to translate
infrared finite quantities computed in FDR to the MSbar renormalization scheme.
As a by-product of our analysis, we solve a problem analogous to the breakdown
of unitarity in the Four Dimensional Helicity (FDH) method beyond one loop. A
fix to FDH is then presented that preserves the renormalizability properties of
QCD without introducing evanescent quantities.
| [
{
"created": "Tue, 30 Jun 2015 14:00:38 GMT",
"version": "v1"
}
] | 2015-12-01 | [
[
"Page",
"Ben",
""
],
[
"Pittau",
"Roberto",
""
]
] | We link the FDR treatment of ultraviolet (UV) divergences to dimensional regularization up to two loops in QCD. This allows us to derive the one-loop and two-loop coupling constant and quark mass shifts necessary to translate infrared finite quantities computed in FDR to the MSbar renormalization scheme. As a by-product of our analysis, we solve a problem analogous to the breakdown of unitarity in the Four Dimensional Helicity (FDH) method beyond one loop. A fix to FDH is then presented that preserves the renormalizability properties of QCD without introducing evanescent quantities. |
2204.05269 | Johannes Braathen | Henning Bahl, Johannes Braathen, Georg Weiglein | New physics effects on the $W$-boson mass from a doublet extension of
the SM Higgs sector | 9 pages, 4 figures; v2: matches version published in PLB | Phys.Lett. B 833 (2022) 137295 | 10.1016/j.physletb.2022.137295 | DESY-22-065, EFI-22-4 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the CDF collaboration has reported a new precision measurement of
the $W$-boson mass, $M_W$, showing a large deviation from the value predicted
by the Standard Model (SM). In this paper, we analyse possible new physics
contributions to $M_W$ from extended Higgs sectors. We focus on the
Two-Higgs-Doublet Model (2HDM) as a concrete example. Employing predictions for
the electroweak precision observables in the 2HDM at the two-loop level and
taking into account further theoretical and experimental constraints, we
identify parameter regions of the 2HDM in which the prediction for $M_W$ is
close to the new CDF value. We assess the compatibility of these regions with
precision measurements of the effective weak mixing angle and the total width
of the $Z$ boson.
| [
{
"created": "Mon, 11 Apr 2022 17:17:56 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2022 10:03:18 GMT",
"version": "v2"
}
] | 2022-07-27 | [
[
"Bahl",
"Henning",
""
],
[
"Braathen",
"Johannes",
""
],
[
"Weiglein",
"Georg",
""
]
] | Recently, the CDF collaboration has reported a new precision measurement of the $W$-boson mass, $M_W$, showing a large deviation from the value predicted by the Standard Model (SM). In this paper, we analyse possible new physics contributions to $M_W$ from extended Higgs sectors. We focus on the Two-Higgs-Doublet Model (2HDM) as a concrete example. Employing predictions for the electroweak precision observables in the 2HDM at the two-loop level and taking into account further theoretical and experimental constraints, we identify parameter regions of the 2HDM in which the prediction for $M_W$ is close to the new CDF value. We assess the compatibility of these regions with precision measurements of the effective weak mixing angle and the total width of the $Z$ boson. |
2007.10311 | Wen Yin | Fuminobu Takahashi, Masaki Yamada, and Wen Yin | What if ALP dark matter for the XENON1T excess is the inflaton | 21pages, 4figures | null | 10.1007/JHEP01(2021)152 | TU-1106, IPMU20-0081 | hep-ph astro-ph.CO gr-qc hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent XENON1T excess in the electron recoil data can be explained by
anomaly-free axion-like particle (ALP) dark matter with mass $m_\phi = 2.3 \pm
0.2\,$keV and the decay constant $f_\phi/q_e \simeq 2 \times 10^{10}
\sqrt{\Omega_\phi/\Omega_{\rm DM}}\,{\rm GeV}$. Intriguingly, the suggested
mass and decay constant are consistent with the relation, $f_\phi \sim 10^3
\sqrt{m_\phi M_p}$, predicted in a scenario where the ALP plays the role of the
inflaton. This raises a possibility that the ALP dark matter responsible for
the XENON1T excess also drove inflation in the very early universe. We study
implications of the XENON1T excess for the ALP inflation and thermal history of
the universe after inflation.
| [
{
"created": "Mon, 20 Jul 2020 17:56:29 GMT",
"version": "v1"
}
] | 2021-05-12 | [
[
"Takahashi",
"Fuminobu",
""
],
[
"Yamada",
"Masaki",
""
],
[
"Yin",
"Wen",
""
]
] | The recent XENON1T excess in the electron recoil data can be explained by anomaly-free axion-like particle (ALP) dark matter with mass $m_\phi = 2.3 \pm 0.2\,$keV and the decay constant $f_\phi/q_e \simeq 2 \times 10^{10} \sqrt{\Omega_\phi/\Omega_{\rm DM}}\,{\rm GeV}$. Intriguingly, the suggested mass and decay constant are consistent with the relation, $f_\phi \sim 10^3 \sqrt{m_\phi M_p}$, predicted in a scenario where the ALP plays the role of the inflaton. This raises a possibility that the ALP dark matter responsible for the XENON1T excess also drove inflation in the very early universe. We study implications of the XENON1T excess for the ALP inflation and thermal history of the universe after inflation. |
hep-ph/9705368 | Jeremy S. Heyl | Jeremy S. Heyl and Lars Hernquist | QED One-loop Corrections to a Macroscopic Magnetic Dipole | 11 pages, 4 figures, to appear in Journal of Physics A | J.Phys.A30:6475-6483,1997 | 10.1088/0305-4470/30/18/021 | null | hep-ph astro-ph nucl-th | null | We consider the field equations of a static magnetic field including one-loop
QED corrections, and calculate the corrections to the field of a magnetic
dipole.
PACS: 12.20.Ds, 97.60.Jd, 97.60.Gb
| [
{
"created": "Tue, 20 May 1997 20:23:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Heyl",
"Jeremy S.",
""
],
[
"Hernquist",
"Lars",
""
]
] | We consider the field equations of a static magnetic field including one-loop QED corrections, and calculate the corrections to the field of a magnetic dipole. PACS: 12.20.Ds, 97.60.Jd, 97.60.Gb |
0806.1394 | Gregory Sanguinetti | S. Karg, G. Sanguinetti | NLO QCD corrections to the production of a weak boson pair associated by
a hard jet | Talk at 2008 Rencontres de Moriond, QCD session, La Thuile, March
2007. Four pages | null | null | LAPTH-Conf-1255/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we discuss recent progress concerning precise predictions for
the LHC. We give a status report of an application of the GOLEM method to deal
with multi-leg one-loop amplitudes, namely the next-to-leading order QCD
corrections to the process pp to V V + jet, where V is a weak boson W,Z.
| [
{
"created": "Mon, 9 Jun 2008 08:18:51 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jul 2008 16:54:19 GMT",
"version": "v2"
}
] | 2008-07-07 | [
[
"Karg",
"S.",
""
],
[
"Sanguinetti",
"G.",
""
]
] | In this talk we discuss recent progress concerning precise predictions for the LHC. We give a status report of an application of the GOLEM method to deal with multi-leg one-loop amplitudes, namely the next-to-leading order QCD corrections to the process pp to V V + jet, where V is a weak boson W,Z. |
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