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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0007147
|
Elena Goubankova
|
Elena Gubankova
|
Flow equations in the light-front QCD
|
12 pages, LaTeX2e, uses sprocl.sty, Talk presented at the 4th
Workshop "Continuous Advances in QCD", Minneapolis, Minnesota, May 12-14,
2000
| null | null | null |
hep-ph
| null |
Flow equations method of continuous unitary transformations is used to
eliminate the minimal quark-gluon interaction in the light-front quantized QCD
Hamiltonian. The coupled differential equations in the two lowest Fock sectors
correspond to the renormalization of the light-front gluon mass and the
generation of effective quark-antiquark interaction. The influence of the
renormalization of the gluon effective mass on the elimination of the
quark-gluon coupling and the induced quark-antiquark interaction is taken into
account. Namely, the original gauge field coupling can be completely
eliminated, even when the states connected by this interaction are degenerate.
Furthermore, even in the case where effective interaction, obtained within
perturbative schemes (bound state perturbation theory or perturbative
similarity approach), is not defined, we obtain more singular behavior $1/q^4$
at small gluon momenta. This is due to asymptotic behavior of the effective
gluon mass at small cutoffs. By discussing the consequences of this asymptotic
behavior, it seems that our approach is superior to perturbation theory and to
perturbative similarity approach.
|
[
{
"created": "Thu, 13 Jul 2000 23:28:33 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gubankova",
"Elena",
""
]
] |
Flow equations method of continuous unitary transformations is used to eliminate the minimal quark-gluon interaction in the light-front quantized QCD Hamiltonian. The coupled differential equations in the two lowest Fock sectors correspond to the renormalization of the light-front gluon mass and the generation of effective quark-antiquark interaction. The influence of the renormalization of the gluon effective mass on the elimination of the quark-gluon coupling and the induced quark-antiquark interaction is taken into account. Namely, the original gauge field coupling can be completely eliminated, even when the states connected by this interaction are degenerate. Furthermore, even in the case where effective interaction, obtained within perturbative schemes (bound state perturbation theory or perturbative similarity approach), is not defined, we obtain more singular behavior $1/q^4$ at small gluon momenta. This is due to asymptotic behavior of the effective gluon mass at small cutoffs. By discussing the consequences of this asymptotic behavior, it seems that our approach is superior to perturbation theory and to perturbative similarity approach.
|
hep-ph/0609143
|
Sherstnev Alexander
|
A. Sherstnev
|
Prospects for b-quark production cross section measurements in pp
collisions at the LHC
|
4 pages, 6 figures. Talk given at the 7th International Conference on
Hyperons, Charm And Beauty Hadrons (BEACH 2006), 2-8 July 2006, Lancaster, UK
|
Nucl.Phys.Proc.Suppl.167:21-24,2007
|
10.1016/j.nuclphysbps.2006.12.084
| null |
hep-ph
| null |
A brief review of theoretical and experimental aspects of $b$-quark
production measurements at the LHC.
|
[
{
"created": "Thu, 14 Sep 2006 17:43:29 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Sherstnev",
"A.",
""
]
] |
A brief review of theoretical and experimental aspects of $b$-quark production measurements at the LHC.
|
1605.08216
|
Dremin
|
I.M. Dremin
|
Critical behavior of cross sections at LHC
|
12 pages, 1 Fig
| null |
10.1142/S0217751X16501074
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent experimental data on elastic scattering of high energy protons show
that the critical regime has been reached at LHC energies. The approach to
criticality is demonstrated by increase of the ratio of elastic to total cross
sections from ISR to LHC energies. At LHC it reaches the value which can result
in principal change of the character of proton interactions. The treatment of
new physics of hollowed toroid-like hadrons requires usage of another branch of
the unitarity condition. Its further fate is speculated and interpreted with
the help of the unitarity condition in combination with present experimental
data. The gedanken experiments to distinguish between different possibilities
are proposed.
|
[
{
"created": "Thu, 26 May 2016 10:14:30 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2016 11:49:14 GMT",
"version": "v2"
}
] |
2016-08-03
|
[
[
"Dremin",
"I. M.",
""
]
] |
Recent experimental data on elastic scattering of high energy protons show that the critical regime has been reached at LHC energies. The approach to criticality is demonstrated by increase of the ratio of elastic to total cross sections from ISR to LHC energies. At LHC it reaches the value which can result in principal change of the character of proton interactions. The treatment of new physics of hollowed toroid-like hadrons requires usage of another branch of the unitarity condition. Its further fate is speculated and interpreted with the help of the unitarity condition in combination with present experimental data. The gedanken experiments to distinguish between different possibilities are proposed.
|
hep-ph/0110006
|
Yuri V. Novozhilov
|
Victor Novozhilov and Yuri Novozhilov (St.Petersburg University)
|
Colour chiral solitons in low energy QCD
|
12 pages, Latex, Discussion of the confining potential between colour
solitons and journal reference are added
|
Physics Letters B 522 (2001) 49-56
|
10.1016/S0370-2693(01)01263-1
| null |
hep-ph
| null |
We derive an effective colour chiral action with a background gauge field.
The action describes configurations of soliton-skyrmion type. Kinetic term
constant $f_0^2$, analogue of $f_\pi ^2$, is a phenomenological dimensional
parameter of the model; $d=4$ terms are unique up to the choice of background
gauge field. The case of SU(2) colour group is discussed in detail. We study an
isolated configuration, i.e. a configuration in a background field which is the
vacuum field forming the gluon condensate. Thereby we introduce the condensate
energy as a second parameter and scale. Compared with the case of flavor
skyrmion configuration, the colour chiral action contains a piece with slowly
decreasing terms coming from the background vacuum field. Asymptotic behaviour
at large distances shows exponential decrease for the case of chromomagnetic
condensates and periodic otherwise . This defines a stability region for a
colour soliton. The mass is given by the positive definite integrand for a
soliton of purely bosonization origin. Contribution from the Yang-Mills action
of the background colour field has the sign opposite to bosonization part. The
baryon number current is not influenced by the background field and leads to
the standard baryon number $B=N_F/N_C$ . For $B=1/3$ we evaluated the estimate
from above $M\approx 460$ $Mev$ .
|
[
{
"created": "Sat, 29 Sep 2001 04:55:10 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2002 18:10:27 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Novozhilov",
"Victor",
"",
"St.Petersburg University"
],
[
"Novozhilov",
"Yuri",
"",
"St.Petersburg University"
]
] |
We derive an effective colour chiral action with a background gauge field. The action describes configurations of soliton-skyrmion type. Kinetic term constant $f_0^2$, analogue of $f_\pi ^2$, is a phenomenological dimensional parameter of the model; $d=4$ terms are unique up to the choice of background gauge field. The case of SU(2) colour group is discussed in detail. We study an isolated configuration, i.e. a configuration in a background field which is the vacuum field forming the gluon condensate. Thereby we introduce the condensate energy as a second parameter and scale. Compared with the case of flavor skyrmion configuration, the colour chiral action contains a piece with slowly decreasing terms coming from the background vacuum field. Asymptotic behaviour at large distances shows exponential decrease for the case of chromomagnetic condensates and periodic otherwise . This defines a stability region for a colour soliton. The mass is given by the positive definite integrand for a soliton of purely bosonization origin. Contribution from the Yang-Mills action of the background colour field has the sign opposite to bosonization part. The baryon number current is not influenced by the background field and leads to the standard baryon number $B=N_F/N_C$ . For $B=1/3$ we evaluated the estimate from above $M\approx 460$ $Mev$ .
|
1802.01805
|
Mosleh Almarashi
|
M. M. Almarashi
|
The second lightest CP-even Higgs boson signals in the NMSSM at the LHC
|
12 pages, 6 figures, 37 subfigures
|
Int.J.Mod.Phys. A33 (2018) 1850071
|
10.1142/S0217751X18500719
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the signal rates of the second lightest CP-even Higgs boson, $h_2$,
of the NMSSM produced in gluon fusion, in association with bottom quarks and in
association with top quarks, which is not the SM-like Higgs boson, at the LHC.
We evaluate the production rates of the $h_2$ in the SM fermionic and bosonic
final states in addition to $a_1a_1$, $h_1h_1$ and $Za_1$ final states. It is
observed that the size of the signal rates in some regions of the NMSSM
parameter space is quite large and that could help extracting the $h_2$ signals
at the LHC through a variety of decay channels.
|
[
{
"created": "Tue, 6 Feb 2018 05:35:22 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2018 07:49:52 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Apr 2018 04:50:41 GMT",
"version": "v3"
}
] |
2018-04-05
|
[
[
"Almarashi",
"M. M.",
""
]
] |
We study the signal rates of the second lightest CP-even Higgs boson, $h_2$, of the NMSSM produced in gluon fusion, in association with bottom quarks and in association with top quarks, which is not the SM-like Higgs boson, at the LHC. We evaluate the production rates of the $h_2$ in the SM fermionic and bosonic final states in addition to $a_1a_1$, $h_1h_1$ and $Za_1$ final states. It is observed that the size of the signal rates in some regions of the NMSSM parameter space is quite large and that could help extracting the $h_2$ signals at the LHC through a variety of decay channels.
|
1708.09849
|
Gauthier Durieux
|
Gauthier Durieux
|
Precision constraints on the top-quark effective field theory at future
lepton colliders
|
5 pages, contribution to DIS 2017 proceedings
| null | null |
DESY 17-123
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We examine the constraints that future lepton colliders would impose on the
effective field theory describing modifications of top-quark interactions
beyond the standard model, through measurements of the $e^+e^-\to bW^+\:\bar
bW^-$ process. Statistically optimal observables are exploited to constrain
simultaneously and efficiently all relevant operators. Their constraining power
is sufficient for quadratic effective-field-theory contributions to have
negligible impact on limits which are therefore basis independent. This is
contrasted with the measurements of cross sections and forward-backward
asymmetries. An overall measure of constraints strength, the global determinant
parameter, is used to determine which run parameters impose the strongest
restriction on the multidimensional effective-field-theory parameter space.
|
[
{
"created": "Thu, 31 Aug 2017 17:55:10 GMT",
"version": "v1"
}
] |
2017-09-01
|
[
[
"Durieux",
"Gauthier",
""
]
] |
We examine the constraints that future lepton colliders would impose on the effective field theory describing modifications of top-quark interactions beyond the standard model, through measurements of the $e^+e^-\to bW^+\:\bar bW^-$ process. Statistically optimal observables are exploited to constrain simultaneously and efficiently all relevant operators. Their constraining power is sufficient for quadratic effective-field-theory contributions to have negligible impact on limits which are therefore basis independent. This is contrasted with the measurements of cross sections and forward-backward asymmetries. An overall measure of constraints strength, the global determinant parameter, is used to determine which run parameters impose the strongest restriction on the multidimensional effective-field-theory parameter space.
|
hep-ph/9311325
| null |
Matthias Neubert
|
QCD-Based Interpretation of the Lepton Spectrum in Inclusive $\bar B\to
X_u\,\ell\,\bar\nu$ Decays
|
17 pages LaTeX, 3 post- script figures available upon request,
CERN-TH.7087/93
|
Phys.Rev.D49:3392-3398,1994
|
10.1103/PhysRevD.49.3392
| null |
hep-ph
| null |
We present a QCD-based approach to the endpoint region of the lepton spectrum
in $\bar B\to X_u\,\ell\,\bar\nu$ decays. We introduce a genuinely
nonperturbative form factor, the shape function, which describes the fall-off
of the spectrum close to the endpoint. The moments of this function are related
to forward scattering matrix elements of local, higher-dimension operators. We
find that nonperturbative effects are dominant over a finite region in the
lepton energy spectrum, the width of which is related to the kinetic energy of
the $b$-quark inside the $B$ meson. Applications of our method to the
extraction of fundamental standard model parameters, among them $V_{ub}$, are
discussed in detail.
|
[
{
"created": "Sun, 21 Nov 1993 18:55:37 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Neubert",
"Matthias",
""
]
] |
We present a QCD-based approach to the endpoint region of the lepton spectrum in $\bar B\to X_u\,\ell\,\bar\nu$ decays. We introduce a genuinely nonperturbative form factor, the shape function, which describes the fall-off of the spectrum close to the endpoint. The moments of this function are related to forward scattering matrix elements of local, higher-dimension operators. We find that nonperturbative effects are dominant over a finite region in the lepton energy spectrum, the width of which is related to the kinetic energy of the $b$-quark inside the $B$ meson. Applications of our method to the extraction of fundamental standard model parameters, among them $V_{ub}$, are discussed in detail.
|
1006.2304
|
Jordy Vries de
|
J. de Vries, E. Mereghetti, R. G. E. Timmermans, U. van Kolck
|
The Nucleon Electric Dipole Form Factor From Dimension-Six Time-Reversal
Violation
| null |
Phys.Lett.B695:268-274,2011
|
10.1016/j.physletb.2010.11.042
|
INT-PUB-10-026
|
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the electric dipole form factor of the nucleon that arises as a
low-energy manifestation of time-reversal violation in quark-gluon interactions
of effective dimension 6: the quark electric and chromoelectric dipole moments,
and the gluon chromoelectric dipole moment. We use the framework of two-flavor
chiral perturbation theory to one loop.
|
[
{
"created": "Fri, 11 Jun 2010 13:35:24 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2010 09:28:15 GMT",
"version": "v2"
}
] |
2011-01-04
|
[
[
"de Vries",
"J.",
""
],
[
"Mereghetti",
"E.",
""
],
[
"Timmermans",
"R. G. E.",
""
],
[
"van Kolck",
"U.",
""
]
] |
We calculate the electric dipole form factor of the nucleon that arises as a low-energy manifestation of time-reversal violation in quark-gluon interactions of effective dimension 6: the quark electric and chromoelectric dipole moments, and the gluon chromoelectric dipole moment. We use the framework of two-flavor chiral perturbation theory to one loop.
|
1112.3570
|
Kirill Semenov-Tian-Shansky
|
J. P. Lansberg, B. Pire, K. Semenov-Tian-Shansky and L. Szymanowski
|
A consistent model for \pi N transition distribution amplitudes and
backward pion electroproduction
|
39 pages, 9 figures
| null |
10.1103/PhysRevD.85.054021
|
CPHT-RR100.1111; LPT-11-114
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The extension of the concept of generalized parton distributions leads to the
introduction of baryon to meson transition distribution amplitudes (TDAs),
non-diagonal matrix elements of the nonlocal three quark operator between a
nucleon and a meson state. We present a general framework for modelling nucleon
to pion ($\pi N$) TDAs. Our main tool is the spectral representation for \pi N
TDAs in terms of quadruple distributions. We propose a factorized Ansatz for
quadruple distributions with input from the soft-pion theorem for \pi N TDAs.
The spectral representation is complemented with a D-term like contribution
from the nucleon exchange in the cross channel. We then study backward pion
electroproduction in the QCD collinear factorization approach in which the
non-perturbative part of the amplitude involves \pi N TDAs. Within our two
component model for \pi N TDAs we update previous leading-twist estimates of
the unpolarized cross section. Finally, we compute the transverse target single
spin asymmetry as a function of skewness. We find it to be sizable in the
valence region and sensitive to the phenomenological input of our \pi N TDA
model.
|
[
{
"created": "Thu, 15 Dec 2011 17:14:25 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Lansberg",
"J. P.",
""
],
[
"Pire",
"B.",
""
],
[
"Semenov-Tian-Shansky",
"K.",
""
],
[
"Szymanowski",
"L.",
""
]
] |
The extension of the concept of generalized parton distributions leads to the introduction of baryon to meson transition distribution amplitudes (TDAs), non-diagonal matrix elements of the nonlocal three quark operator between a nucleon and a meson state. We present a general framework for modelling nucleon to pion ($\pi N$) TDAs. Our main tool is the spectral representation for \pi N TDAs in terms of quadruple distributions. We propose a factorized Ansatz for quadruple distributions with input from the soft-pion theorem for \pi N TDAs. The spectral representation is complemented with a D-term like contribution from the nucleon exchange in the cross channel. We then study backward pion electroproduction in the QCD collinear factorization approach in which the non-perturbative part of the amplitude involves \pi N TDAs. Within our two component model for \pi N TDAs we update previous leading-twist estimates of the unpolarized cross section. Finally, we compute the transverse target single spin asymmetry as a function of skewness. We find it to be sizable in the valence region and sensitive to the phenomenological input of our \pi N TDA model.
|
2005.05658
|
Marius Utheim
|
Torbj\"orn Sj\"ostrand, Marius Utheim
|
A Framework for Hadronic Rescattering in pp Collisions
|
61 pages, 24 figures, 10 tables
| null |
10.1140/epjc/s10052-020-8399-3
|
LU TP 20-11, MCnet-20-12
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, a framework for hadronic rescattering in the general-purpose
Pythia event generator is introduced. The starting point is the recently
presented space-time picture of the hadronization process. It is now extended
with a tracing of the subsequent motion of the primary hadrons, including both
subsequent scattering processes among them and decays of them. The major new
component is cross-section parameterizations for a range of possible
hadron-hadron combinations, applicable from threshold energies upwards. The
production dynamics in these collisions has also been extended to cope with
different kinds of low-energy processes. The properties of the model are
studied, and some first comparisons with LHC pp data are presented. Whereas it
turns out that approximately half of all final particles participated in
rescatterings, the net effects in pp events are still rather limited, and only
striking in a few distributions. The new code opens up for several future
studies, however, such as effects in pA and AA collisions.
|
[
{
"created": "Tue, 12 May 2020 10:08:33 GMT",
"version": "v1"
}
] |
2020-10-28
|
[
[
"Sjöstrand",
"Torbjörn",
""
],
[
"Utheim",
"Marius",
""
]
] |
In this article, a framework for hadronic rescattering in the general-purpose Pythia event generator is introduced. The starting point is the recently presented space-time picture of the hadronization process. It is now extended with a tracing of the subsequent motion of the primary hadrons, including both subsequent scattering processes among them and decays of them. The major new component is cross-section parameterizations for a range of possible hadron-hadron combinations, applicable from threshold energies upwards. The production dynamics in these collisions has also been extended to cope with different kinds of low-energy processes. The properties of the model are studied, and some first comparisons with LHC pp data are presented. Whereas it turns out that approximately half of all final particles participated in rescatterings, the net effects in pp events are still rather limited, and only striking in a few distributions. The new code opens up for several future studies, however, such as effects in pA and AA collisions.
|
2201.08139
|
Xiao-Min Shen
|
Xiao-Min Shen, YaLu Hu, ChuanLe Sun, Jun Gao
|
Decay of the charged Higgs boson and the top quark in two-Higgs-doublet
model at NNLO in QCD
|
27 pages, 8 figures; typos corrected
| null |
10.1007/JHEP05(2022)157
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We present numerical calculations of the partial width of the charged Higgs
boson decay into a top quark, $H^- \rightarrow \bar{t} + b + X$, and the
partial width of the top quark decay into a light charged Higgs boson $t
\rightarrow H^+ + b + X$ at next-to-next-to-leading order (NNLO) in QCD, based
on a factorization formula of the jet mass. The NNLO corrections significantly
reduce the renormalization scale dependence of the partial decay width in both
cases. We show relative size of the NNLO corrections for different charged
Higgs boson masses and for different renormalization scales. The NNLO
corrections are about 16% (1%) of the leading order widths for the charged
Higgs boson mass of 200GeV (2000GeV), while it is quite small for the top quark
decay. Our analyses are independent of the detailed structure of the Yukawa
couplings, and can be applied to various new physics models, as demonstrated by
the decay branching ratio in different types of the two-Higgs-doublet models.
|
[
{
"created": "Thu, 20 Jan 2022 12:32:31 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2022 07:23:03 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jun 2022 06:21:10 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Jul 2022 06:45:20 GMT",
"version": "v4"
}
] |
2022-07-07
|
[
[
"Shen",
"Xiao-Min",
""
],
[
"Hu",
"YaLu",
""
],
[
"Sun",
"ChuanLe",
""
],
[
"Gao",
"Jun",
""
]
] |
We present numerical calculations of the partial width of the charged Higgs boson decay into a top quark, $H^- \rightarrow \bar{t} + b + X$, and the partial width of the top quark decay into a light charged Higgs boson $t \rightarrow H^+ + b + X$ at next-to-next-to-leading order (NNLO) in QCD, based on a factorization formula of the jet mass. The NNLO corrections significantly reduce the renormalization scale dependence of the partial decay width in both cases. We show relative size of the NNLO corrections for different charged Higgs boson masses and for different renormalization scales. The NNLO corrections are about 16% (1%) of the leading order widths for the charged Higgs boson mass of 200GeV (2000GeV), while it is quite small for the top quark decay. Our analyses are independent of the detailed structure of the Yukawa couplings, and can be applied to various new physics models, as demonstrated by the decay branching ratio in different types of the two-Higgs-doublet models.
|
hep-ph/9504245
| null |
Wilfried Buchmuller (DESY)
|
Scaling and Diffraction in Deep Inelastic Scattering
|
8 pages
|
Phys.Lett. B353 (1995) 335-339
|
10.1016/0370-2693(95)00597-E
|
DESY 95-065
|
hep-ph
| null |
We pursue the hypothesis that the events with a large rapidity gap, observed
at HERA, reflect the scattering of electrons off lumps of wee partons inside
the proton. A simple scaling behaviour is predicted for the diffractive
structure functions, which are related to the inclusive structure function
$F_2(x,Q^2)$ at small values of the scaling variable $x$. The results are
compared with recent measurements of the diffractive structure function
$F_2^D(x,Q^2,M^2)$.
|
[
{
"created": "Thu, 6 Apr 1995 16:46:34 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Buchmuller",
"Wilfried",
"",
"DESY"
]
] |
We pursue the hypothesis that the events with a large rapidity gap, observed at HERA, reflect the scattering of electrons off lumps of wee partons inside the proton. A simple scaling behaviour is predicted for the diffractive structure functions, which are related to the inclusive structure function $F_2(x,Q^2)$ at small values of the scaling variable $x$. The results are compared with recent measurements of the diffractive structure function $F_2^D(x,Q^2,M^2)$.
|
1610.00364
|
Holger Frits Bech Nielsen
|
Holger Frits Bech Nielsen
|
F(750), We Miss You, as Bound State of 6 Top and 6 Anti top
|
minor corrections in calculation and commas and a few references
added. arXiv admin note: text overlap with arXiv:1607.07907, adding few
citations
| null |
10.1142/S0217751X16501864
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We collect and estimate support for our long speculated "multiple point
principle" saying that there should be several vacua all having (compared to
the scales of high energy physics) very low energy densities. In pure Standard
Model we suggest there being three by "multiple point principle" low energy
density vacua, "present", "condensate" and "high field" vacuum. We fit the mass
of the in our picture since long speculated bound state of six top and six anti
top quarks in three quite {\em independent ways} and get remarkably within our
crude accuracy the {\em same} mass in all three fits! The new point of the
present article is to estimate the bound state mass in what we could call a bag
model estimation. The two other fits, which we review, obtain the mass of the
bound state by fitting to the multiple point principle prediction of degenerate
vacua.
Our remarkable agreement of our three mass-fits can be interpreted to mean,
that we have calculated at the end the energy densities of the two extra
speculated vacua and found that they are indeed very small!. Unfortunately the
recently much discussed statistical fluctuation peak F(750) has now been
revealed to be just a fluctuation, very accidentally matches our fitted mass of
the bound state remarkably well with the mass of this fluctuation 750 GeV.
|
[
{
"created": "Sun, 2 Oct 2016 22:52:46 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2016 14:53:32 GMT",
"version": "v2"
}
] |
2017-02-01
|
[
[
"Nielsen",
"Holger Frits Bech",
""
]
] |
We collect and estimate support for our long speculated "multiple point principle" saying that there should be several vacua all having (compared to the scales of high energy physics) very low energy densities. In pure Standard Model we suggest there being three by "multiple point principle" low energy density vacua, "present", "condensate" and "high field" vacuum. We fit the mass of the in our picture since long speculated bound state of six top and six anti top quarks in three quite {\em independent ways} and get remarkably within our crude accuracy the {\em same} mass in all three fits! The new point of the present article is to estimate the bound state mass in what we could call a bag model estimation. The two other fits, which we review, obtain the mass of the bound state by fitting to the multiple point principle prediction of degenerate vacua. Our remarkable agreement of our three mass-fits can be interpreted to mean, that we have calculated at the end the energy densities of the two extra speculated vacua and found that they are indeed very small!. Unfortunately the recently much discussed statistical fluctuation peak F(750) has now been revealed to be just a fluctuation, very accidentally matches our fitted mass of the bound state remarkably well with the mass of this fluctuation 750 GeV.
|
1402.0837
|
Anatoliy Khrykin
|
A.S.Khrykin
|
On the existence of the $\it NN$-decoupled dibaryon $d^\ast_1$(1956)
|
Contribution to the MENU2013 Proceedings
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present strong experimental evidence for the existence of a nonstrange
$\it NN$-decoupled dibaryon with a mass of about 1956 MeV stable against strong
decay, which is a very likely candidate for long-sought multiquark hadrons with
the baryon number B=2. We start by presenting the first evidence for the
existence of this dibaryon called $d^{\ast }_{1}$(1956), that was found in the
energy spectrum of coincident photons emitted at $\pm 90^0$ from the reaction
$pp \to pp \gamma\gamma$ at an energy of 216 MeV measured at JINR. We then show
its signatures found in several experimental energy spectra of single photons
and invariant mass spectra of photon pairs from photon production processes
induced by nucleon-nucleon and nucleon-nucleus collisions at intermediate
energies.
|
[
{
"created": "Tue, 4 Feb 2014 19:21:27 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Khrykin",
"A. S.",
""
]
] |
We present strong experimental evidence for the existence of a nonstrange $\it NN$-decoupled dibaryon with a mass of about 1956 MeV stable against strong decay, which is a very likely candidate for long-sought multiquark hadrons with the baryon number B=2. We start by presenting the first evidence for the existence of this dibaryon called $d^{\ast }_{1}$(1956), that was found in the energy spectrum of coincident photons emitted at $\pm 90^0$ from the reaction $pp \to pp \gamma\gamma$ at an energy of 216 MeV measured at JINR. We then show its signatures found in several experimental energy spectra of single photons and invariant mass spectra of photon pairs from photon production processes induced by nucleon-nucleon and nucleon-nucleus collisions at intermediate energies.
|
hep-ph/9612349
|
Nikolai Uraltsev
|
N.G. Uraltsev
|
The Heavy Quark Expansion
|
30 pages, 3 figures in the text; LaTeX. Talk given at the Symposium
on Radiative Corrections (CRAD96), Cracow, 1-5 August 1996. To appear in
Proceedings of "CRAD96"
|
Acta Phys.Polon.B28:755-787,1997
| null |
UND-HEP-96-BIG08
|
hep-ph
| null |
I review the status of the modern theoretical approach to weak decays of
heavy flavor hadrons based on the 1/m_Q expansion in QCD. The qualitative
features are explained and the subtleties in simultaneously incorporating
perturbative and power-suppressed effects are addressed. A few topical
phenomenological applications are discussed in quantitative detail.
|
[
{
"created": "Fri, 13 Dec 1996 03:04:51 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Uraltsev",
"N. G.",
""
]
] |
I review the status of the modern theoretical approach to weak decays of heavy flavor hadrons based on the 1/m_Q expansion in QCD. The qualitative features are explained and the subtleties in simultaneously incorporating perturbative and power-suppressed effects are addressed. A few topical phenomenological applications are discussed in quantitative detail.
|
hep-ph/9409266
|
Masahiro Yamaguchi
|
Izumi Joichi and Masahiro Yamaguchi
|
Heavy Polonyi Field as a Solution of the Polonyi Problem
| null |
Phys.Lett. B342 (1995) 111-116
|
10.1016/0370-2693(94)01338-D
| null |
hep-ph
| null |
We study properties of the Polonyi field in the renormalizable hidden sector
in supergravity models. It is shown that radiative corrections induce a sizable
coupling of the Polonyi field to gravitinos as well as raise its mass to an
intermediate scale. We find it serves a solution of the Polonyi problem and
show that the gravitino abundance produced by the Polonyi decay is not large.
It is also pointed out that soft supersymmetry breaking terms induced by this
hidden sector are very restricted.
|
[
{
"created": "Fri, 9 Sep 1994 05:28:33 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Joichi",
"Izumi",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] |
We study properties of the Polonyi field in the renormalizable hidden sector in supergravity models. It is shown that radiative corrections induce a sizable coupling of the Polonyi field to gravitinos as well as raise its mass to an intermediate scale. We find it serves a solution of the Polonyi problem and show that the gravitino abundance produced by the Polonyi decay is not large. It is also pointed out that soft supersymmetry breaking terms induced by this hidden sector are very restricted.
|
2201.00832
|
Damiano Anselmi
|
Damiano Anselmi
|
Dressed propagators, fakeon self-energy and peak uncertainty
|
39 pages, 6 figures; v2: JHEP
|
J. High Energ. Phys. 2022, 58 (2022)
|
10.1007/JHEP06(2022)058
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the resummation of self-energy diagrams into dressed propagators in
the case of purely virtual particles and compare the results with those
obtained for physical particles and ghosts. The three geometric series differ
by infinitely many contact terms, which do not admit well-defined sums. The
peak region, which is outside the convergence domain, can only be reached in
the case of physical particles, thanks to analyticity. In the other cases,
nonperturbative effects become important. To clarify the matter, we introduce
the energy resolution $\Delta E$ around the peak and argue that a "peak
uncertainty" $\Delta E\gtrsim \Delta E_{\text{min}}\simeq \Gamma _{\text{f}}/2$
around energies $ E\simeq m_{\text{f}}$ expresses the impossibility to approach
the fakeon too closely, $m_{\text{f}}$ being the fakeon mass and $\Gamma
_{\text{f}}$ being the fakeon width. The introduction of $\Delta E$ is also
crucial to explain the observation of unstable long-lived particles, like the
muon. Indeed, by the common energy-time uncertainty relation, such particles
are also affected by ill-defined sums at $\Delta E=0$, whenever we separate
their observation from the observation of their decay products. We study the
regime of large $\Gamma _{\text{f}}$, which applies to collider physics (and
situations like the one of the $Z$ boson), and the regime of small $\Gamma
_{\text{f}}$, which applies to quantum gravity (and situations like the one of
the muon).
|
[
{
"created": "Mon, 3 Jan 2022 19:00:09 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2022 08:59:18 GMT",
"version": "v2"
}
] |
2022-06-15
|
[
[
"Anselmi",
"Damiano",
""
]
] |
We study the resummation of self-energy diagrams into dressed propagators in the case of purely virtual particles and compare the results with those obtained for physical particles and ghosts. The three geometric series differ by infinitely many contact terms, which do not admit well-defined sums. The peak region, which is outside the convergence domain, can only be reached in the case of physical particles, thanks to analyticity. In the other cases, nonperturbative effects become important. To clarify the matter, we introduce the energy resolution $\Delta E$ around the peak and argue that a "peak uncertainty" $\Delta E\gtrsim \Delta E_{\text{min}}\simeq \Gamma _{\text{f}}/2$ around energies $ E\simeq m_{\text{f}}$ expresses the impossibility to approach the fakeon too closely, $m_{\text{f}}$ being the fakeon mass and $\Gamma _{\text{f}}$ being the fakeon width. The introduction of $\Delta E$ is also crucial to explain the observation of unstable long-lived particles, like the muon. Indeed, by the common energy-time uncertainty relation, such particles are also affected by ill-defined sums at $\Delta E=0$, whenever we separate their observation from the observation of their decay products. We study the regime of large $\Gamma _{\text{f}}$, which applies to collider physics (and situations like the one of the $Z$ boson), and the regime of small $\Gamma _{\text{f}}$, which applies to quantum gravity (and situations like the one of the muon).
|
hep-ph/9704298
|
Bryan Webber
|
Yu.L. Dokshitzer and B.R. Webber
|
Power Corrections to Event Shape Distributions
|
11 pages, LaTeX, 2 figures; further reference to related work by
Korchemsky and Sterman added 30/4/97
|
Phys.Lett. B404 (1997) 321-327
|
10.1016/S0370-2693(97)00573-X
|
Cavendish-HEP-97/2
|
hep-ph
| null |
We estimate the effects of non-perturbative physics on the differential
distributions of infrared- and collinear-safe $e^+e^-$ event shape variables,
by extending the notion of an infrared-regular effective strong coupling, which
accounts for the non-perturbative corrections to the mean values of several
shape variables, to their distributions. This leads to $1/Q$ power corrections
over a range of values of the shape variables considered, where $Q$ is the
centre-of-mass energy. In the case of the thrust variable, the leading
correction is simply a shift of the distribution, by an amount proportional to
$1/Q$. We show that this gives an excellent description of the data throughout
a wide range of $T$ and $Q$.
|
[
{
"created": "Fri, 11 Apr 1997 17:34:27 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 1997 09:45:28 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Dokshitzer",
"Yu. L.",
""
],
[
"Webber",
"B. R.",
""
]
] |
We estimate the effects of non-perturbative physics on the differential distributions of infrared- and collinear-safe $e^+e^-$ event shape variables, by extending the notion of an infrared-regular effective strong coupling, which accounts for the non-perturbative corrections to the mean values of several shape variables, to their distributions. This leads to $1/Q$ power corrections over a range of values of the shape variables considered, where $Q$ is the centre-of-mass energy. In the case of the thrust variable, the leading correction is simply a shift of the distribution, by an amount proportional to $1/Q$. We show that this gives an excellent description of the data throughout a wide range of $T$ and $Q$.
|
hep-ph/0306266
|
Zack Sullivan
|
Zack Sullivan (Fermilab)
|
How to rule out Little Higgs (and constrain many other models) at the
LHC
|
Talk given at the XXXVIIIth Rencontres de Moriond: QCD and Hadronic
Interactions, 2003, 4 pg., latex, 5 ps figures
| null | null | null |
hep-ph hep-ex
| null |
In this talk I describe how to discover or rule out the existence of
W^{prime} bosons at the CERN Large Hadron Collider as a function of arbitrary
couplings and W^{prime} masses. If W^{prime} bosons are not found, I
demonstrate the 95% confidence-level exclusions that can be reached for several
classes of models. In particular, W^{prime} bosons in the entire reasonable
parameter space of Little Higgs models can be discovered or excluded in 1 year
at the LHC.
|
[
{
"created": "Thu, 26 Jun 2003 20:33:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sullivan",
"Zack",
"",
"Fermilab"
]
] |
In this talk I describe how to discover or rule out the existence of W^{prime} bosons at the CERN Large Hadron Collider as a function of arbitrary couplings and W^{prime} masses. If W^{prime} bosons are not found, I demonstrate the 95% confidence-level exclusions that can be reached for several classes of models. In particular, W^{prime} bosons in the entire reasonable parameter space of Little Higgs models can be discovered or excluded in 1 year at the LHC.
|
hep-ph/9403354
|
Yoshio Koide
|
Yoshio Koide and Hideo Fusaoka
|
Seesaw-Type Quark and Lepton Mass Matrices and U(3)-Family Nonet Higgs
Bosons
|
10 pages, Revised version of US-94-02, Latex file
| null | null | null |
hep-ph
| null |
A unified mass matrix model of quarks and leptons with a seesaw-type form
$M_f=m M_F^{-1} m$ is proposed on the basis of a non-standard Higgs scenario.
The matrix $m$ is provided by U(3)-family nonet bosons $\phi$, and the matrix
$M_F$ is a mass matrix of heavy fermions $F_i$ corresponding to the ordinary
fermions $f_i=\nu_i,e_i,u_i,d_i$ ($i=1,2,3$). It is shown that a Higgs
potential of $\phi$ with a broken U(3)-family symmetry leads to a desirable
charged lepton mass formula when $M_E\propto {\bf 1}$. Then, phenomenologically
desirable forms of heavy quark mass matrices $M_Q$ ($Q=U,D$) are investigated.
|
[
{
"created": "Thu, 24 Mar 1994 10:41:19 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 1994 05:48:59 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Koide",
"Yoshio",
""
],
[
"Fusaoka",
"Hideo",
""
]
] |
A unified mass matrix model of quarks and leptons with a seesaw-type form $M_f=m M_F^{-1} m$ is proposed on the basis of a non-standard Higgs scenario. The matrix $m$ is provided by U(3)-family nonet bosons $\phi$, and the matrix $M_F$ is a mass matrix of heavy fermions $F_i$ corresponding to the ordinary fermions $f_i=\nu_i,e_i,u_i,d_i$ ($i=1,2,3$). It is shown that a Higgs potential of $\phi$ with a broken U(3)-family symmetry leads to a desirable charged lepton mass formula when $M_E\propto {\bf 1}$. Then, phenomenologically desirable forms of heavy quark mass matrices $M_Q$ ($Q=U,D$) are investigated.
|
1605.08923
|
Hamad Alhendi
|
H. I. Alrebdi, H. A. Alhendi and T. Barakat
|
The Higgs Boson Mass from Three-loop Effective Potential of Massless
Standard Model
|
19 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effective potential of massless standard model (SM) is calculated up to
three-loop order. The stability of the effective potential and the Higgs boson
mass are investigated up to three-loop order. We found that, Higgs boson mass
$m_{H}$ of one-loop order is large. The two-loop and three-loop results are not
appreciably different from each other. The two-loop and three-loop radiative
corrections have led to an improvement of Higgs boson mass and the value of the
scalar coupling. For the value $m_{t}=170$ GeV at the energy scale $\mu\approx
5.68\times10^2$GeV, we get $m_{H2-loop}\approx 125.4$ GeV. At the energy scale
$\mu\geq28\times10^2$, the scalar coupling $\lambda$ at two-loop becomes
negative and leads to metastable vacuum while the three-loop level is stable
even at high $\mu$ $\approx 10^{19}$ GeV. For the larger $\mu$-range $(3 \times
10^{3} \text{GeV}\leq \mu \leq 20 \times 10^{3} \text{GeV})$ spontaneous
symmetry breaking for one-loop and three-loop occurs at approximately the same
scalar coupling values. We get $m_{H1-loop}\approx 126.14$ GeV at $\mu \approx
6.5 \times 10^{3}$ GeV while for three-loop $m_{H3-loop}\approx 126$ GeV at
$\mu \approx 20 \times 10^{3}$ GeV.
|
[
{
"created": "Sat, 28 May 2016 18:28:54 GMT",
"version": "v1"
}
] |
2016-05-31
|
[
[
"Alrebdi",
"H. I.",
""
],
[
"Alhendi",
"H. A.",
""
],
[
"Barakat",
"T.",
""
]
] |
The effective potential of massless standard model (SM) is calculated up to three-loop order. The stability of the effective potential and the Higgs boson mass are investigated up to three-loop order. We found that, Higgs boson mass $m_{H}$ of one-loop order is large. The two-loop and three-loop results are not appreciably different from each other. The two-loop and three-loop radiative corrections have led to an improvement of Higgs boson mass and the value of the scalar coupling. For the value $m_{t}=170$ GeV at the energy scale $\mu\approx 5.68\times10^2$GeV, we get $m_{H2-loop}\approx 125.4$ GeV. At the energy scale $\mu\geq28\times10^2$, the scalar coupling $\lambda$ at two-loop becomes negative and leads to metastable vacuum while the three-loop level is stable even at high $\mu$ $\approx 10^{19}$ GeV. For the larger $\mu$-range $(3 \times 10^{3} \text{GeV}\leq \mu \leq 20 \times 10^{3} \text{GeV})$ spontaneous symmetry breaking for one-loop and three-loop occurs at approximately the same scalar coupling values. We get $m_{H1-loop}\approx 126.14$ GeV at $\mu \approx 6.5 \times 10^{3}$ GeV while for three-loop $m_{H3-loop}\approx 126$ GeV at $\mu \approx 20 \times 10^{3}$ GeV.
|
hep-ph/9812393
|
Oleg Teryaev
|
M.V. Polyakov, A. Schaefer and O. V. Teryaev
|
The intrinsic charm contribution to the proton spin
|
LATEX, 6 pages
|
Phys.Rev.D60:051502,1999
|
10.1103/PhysRevD.60.051502
|
RUB-TPII-22/98; TPR-98-38
|
hep-ph
| null |
The charm quark contribution to the first moment of $g_1(x,Q^2)$ is
calculated using a heavy mass expansion of the divergence of the singlet axial
current. It is shown to be small.
|
[
{
"created": "Wed, 16 Dec 1998 16:34:27 GMT",
"version": "v1"
}
] |
2009-12-30
|
[
[
"Polyakov",
"M. V.",
""
],
[
"Schaefer",
"A.",
""
],
[
"Teryaev",
"O. V.",
""
]
] |
The charm quark contribution to the first moment of $g_1(x,Q^2)$ is calculated using a heavy mass expansion of the divergence of the singlet axial current. It is shown to be small.
|
hep-ph/9708242
| null |
Keiichi Akama (Saitama Medical College) and Takashi Hattori (Kanagawa
Dental College)
|
Complementarity between Gauge-Boson Compositeness and Asymptotic Freedom
|
5 pages, revtex
| null | null |
SMC-PHYS-154
|
hep-ph
| null |
We derive and solve the compositeness condition for the SU(N_c) gauge boson
at the next-to-leading order in 1/N_f (N_f is the number of flavors) and the
leading order in ln(\Lambda ^2) (\Lambda is the compositeness scale) to obtain
an expression for the gauge coupling constant in terms of the compositeness
scale. It turns out that the argument of gauge-boson compositeness (with a
large \Lambda) is successful only when N_f/N_c>11/2, in which the asymptotic
freedom fails.
|
[
{
"created": "Thu, 31 Jul 1997 10:07:38 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Sep 1997 07:57:42 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Akama",
"Keiichi",
"",
"Saitama Medical College"
],
[
"Hattori",
"Takashi",
"",
"Kanagawa\n Dental College"
]
] |
We derive and solve the compositeness condition for the SU(N_c) gauge boson at the next-to-leading order in 1/N_f (N_f is the number of flavors) and the leading order in ln(\Lambda ^2) (\Lambda is the compositeness scale) to obtain an expression for the gauge coupling constant in terms of the compositeness scale. It turns out that the argument of gauge-boson compositeness (with a large \Lambda) is successful only when N_f/N_c>11/2, in which the asymptotic freedom fails.
|
hep-ph/9706451
|
Cvetic
|
C.S. Kim (Yonsei Univ.) and G. Cvetic (Dortmund Univ.)
|
Flavor democracy and quark mass matrices
|
LaTeX, 12 pages, one correction in Acknowledgements
| null | null |
YUMS 97-018, DO-TH 97-15, SNUTP 97-089
|
hep-ph
| null |
Based on experimental mass hierarchy, a set of flavor-democratic (FD) quark
mass matrices at low energies is discussed. The model predicts CP violation
parameters $J_{CP}=(0.3 \pm 0.2) 10^{-4}$ and ${\epsilon'/\epsilon} = (0.6 \pm
0.5) 10^{-3}$. However, this simple FD model also predicts a physical top quark
mass not much higher than 100 GeV. As a next step, we assume that the Standard
Model (SM) breaks down around some high energy $\Lambda$, and is replaced by a
new FD flavor gauge theory (FGT). This possibility can be investigated by
studying renormalization group equations for the Yukawa couplings of the SM
with two Higgs doublets for various $m_t$ and VEV ratios $v_U/v_D$. With
appropriate flavor-democratic boundary conditions at $\Lambda_{FGT}$, bounds on
masses of top quark and tau-neutrino are derived, which are compatible with
experimental bounds.
|
[
{
"created": "Mon, 23 Jun 1997 08:54:05 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 1997 10:30:06 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jul 1997 09:11:16 GMT",
"version": "v3"
}
] |
2008-02-03
|
[
[
"Kim",
"C. S.",
"",
"Yonsei Univ."
],
[
"Cvetic",
"G.",
"",
"Dortmund Univ."
]
] |
Based on experimental mass hierarchy, a set of flavor-democratic (FD) quark mass matrices at low energies is discussed. The model predicts CP violation parameters $J_{CP}=(0.3 \pm 0.2) 10^{-4}$ and ${\epsilon'/\epsilon} = (0.6 \pm 0.5) 10^{-3}$. However, this simple FD model also predicts a physical top quark mass not much higher than 100 GeV. As a next step, we assume that the Standard Model (SM) breaks down around some high energy $\Lambda$, and is replaced by a new FD flavor gauge theory (FGT). This possibility can be investigated by studying renormalization group equations for the Yukawa couplings of the SM with two Higgs doublets for various $m_t$ and VEV ratios $v_U/v_D$. With appropriate flavor-democratic boundary conditions at $\Lambda_{FGT}$, bounds on masses of top quark and tau-neutrino are derived, which are compatible with experimental bounds.
|
2402.00981
|
Cumrun Vafa
|
Cumrun Vafa
|
Swamplandish Unification of the Dark Sector
|
13 pages
| null | null | null |
hep-ph gr-qc hep-th
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We provide a short overview of recent progress made in our understanding of
the dark sector based on the Swampland program which in turn is rooted in
lessons from string theory. We explain how the existence of one extra
mesoscopic dimension (the ``dark dimension") in the micron range emerges and
how this can lead to a unification of the dark energy and dark matter. In
particular the smallness of the dark energy leads to the prediction of the
existence of a tower of weakly interacting light particles which can naturally
play the role of dark matter. Moreover this unifies dark matter with gravity as
dark matter ends up being excitations of graviton in the dark dimension. We
also explain how in combination with other Swampland principles one finds an
explanation of the ``why now" and the ``cosmological coincidence" problems.
This model is consistent with the cosmological bounds as well as the Newton's
inverse square law, but makes predictions which differ from $\Lambda$CDM. It
also gives rise to an appealing picture of hierarchy of scales in particle
physics pegged to the dark energy, including a possible origin of the
electroweak hierarchy and the prediction of masses of QCD axion and sterile
neutrinos both in the 1-10 meV range. This review is intended for a broad
audience of high energy theorists and cosmologists without prior knowledge of
string theory and it explains the motivations and predictions of this program
in a non-technical form.
|
[
{
"created": "Thu, 1 Feb 2024 19:54:09 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2024 06:11:38 GMT",
"version": "v2"
}
] |
2024-06-24
|
[
[
"Vafa",
"Cumrun",
""
]
] |
We provide a short overview of recent progress made in our understanding of the dark sector based on the Swampland program which in turn is rooted in lessons from string theory. We explain how the existence of one extra mesoscopic dimension (the ``dark dimension") in the micron range emerges and how this can lead to a unification of the dark energy and dark matter. In particular the smallness of the dark energy leads to the prediction of the existence of a tower of weakly interacting light particles which can naturally play the role of dark matter. Moreover this unifies dark matter with gravity as dark matter ends up being excitations of graviton in the dark dimension. We also explain how in combination with other Swampland principles one finds an explanation of the ``why now" and the ``cosmological coincidence" problems. This model is consistent with the cosmological bounds as well as the Newton's inverse square law, but makes predictions which differ from $\Lambda$CDM. It also gives rise to an appealing picture of hierarchy of scales in particle physics pegged to the dark energy, including a possible origin of the electroweak hierarchy and the prediction of masses of QCD axion and sterile neutrinos both in the 1-10 meV range. This review is intended for a broad audience of high energy theorists and cosmologists without prior knowledge of string theory and it explains the motivations and predictions of this program in a non-technical form.
|
0709.1384
|
Massimo Blasone Dr
|
M.Blasone, A.Capolupo, C.R.Ji, G.Vitiello
|
Flavor states of mixed neutrinos
|
4 pages, presented at 13th International Symposium on Particles,
Strings and Cosmology, PASCOS-07, 2-7 July 2007, Imperial College London
|
AIPConf.Proc.957:189-192,2007
|
10.1063/1.2823757
| null |
hep-ph
| null |
By resorting to previous results on flavor mixing in Quantum Field Theory, we
show how to consistently define flavor states of mixed neutrinos as eigenstates
of the flavor charge operators.
|
[
{
"created": "Mon, 10 Sep 2007 13:14:39 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Blasone",
"M.",
""
],
[
"Capolupo",
"A.",
""
],
[
"Ji",
"C. R.",
""
],
[
"Vitiello",
"G.",
""
]
] |
By resorting to previous results on flavor mixing in Quantum Field Theory, we show how to consistently define flavor states of mixed neutrinos as eigenstates of the flavor charge operators.
|
2208.07521
|
Wei Kou
|
Wei Kou, Xiaopeng Wang, Xurong Chen
|
Page Entropy of Proton System in Deep-Inelastic-Scattering at Small-$x$
|
6 pages, 2 figures, Accepted by PRD
| null |
10.1103/PhysRevD.106.096027
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The partons model reveals the dynamical structure of nucleons (protons and
neutrons). Studies related to thermodynamic quantities of nucleons are
interesting and topical questions. In this work, for the first time we apply
Page's theory of the studies of black hole to investigate the entropy of proton
system. Inspired by the quantum entanglement entropy in black hole information
theories, we establish the proton entanglement with the similar way. Based our
calculations, the proton entanglement entropy has the approximate form $S = \ln
m -1/2$, where $m$ represents the partons density of proton (mainly gluon and
sea quark contributions) at small Bjorken $x$. Our calculations using Page's
theory are well in agreement with the recent DIS measurements from H1
collaboration.
|
[
{
"created": "Tue, 16 Aug 2022 03:45:45 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Nov 2022 01:22:36 GMT",
"version": "v2"
}
] |
2022-12-14
|
[
[
"Kou",
"Wei",
""
],
[
"Wang",
"Xiaopeng",
""
],
[
"Chen",
"Xurong",
""
]
] |
The partons model reveals the dynamical structure of nucleons (protons and neutrons). Studies related to thermodynamic quantities of nucleons are interesting and topical questions. In this work, for the first time we apply Page's theory of the studies of black hole to investigate the entropy of proton system. Inspired by the quantum entanglement entropy in black hole information theories, we establish the proton entanglement with the similar way. Based our calculations, the proton entanglement entropy has the approximate form $S = \ln m -1/2$, where $m$ represents the partons density of proton (mainly gluon and sea quark contributions) at small Bjorken $x$. Our calculations using Page's theory are well in agreement with the recent DIS measurements from H1 collaboration.
|
hep-ph/9510216
|
Jorge L. Lopez
|
J. Lopez and D. Nanopoulos
|
Vanishing Str M^2 in the presence of anomalous U_A(1)
|
7 pages, no figures, LaTeX
|
Phys.Lett. B369 (1996) 243-248
|
10.1016/0370-2693(95)01556-6
|
CTP-TAMU-37/95, DOE/ER/40717-16
|
hep-ph hep-th
| null |
We show that the presence of an anomalous $\rm U_A(1)$ factor in the gauge
group of string-derived models may have the new and important phenomenological
consequence of allowing the vanishing of ${\rm Str}\,{\cal M}^2$ in the
``shifted" vacuum, that results in the process of cancelling the anomalous $\rm
U_A(1)$. The feasibility of this effect seems to be enhanced by a vanishing
vacuum energy, and by a ``small" value of ${\rm Str}\,{\cal M}^2$ in the
original vacuum. In the class of free-fermionic models with vanishing vacuum
energy that we focus on, a necessary condition for this mechanism to be
effective is that ${\rm Str}\,{\cal M}^2>0$ in the original vacuum. A vanishing
${\rm Str}\,{\cal M}^2$ ameliorates the cosmological constant problem and is a
necessary element in the stability of the no-scale mechanism.
|
[
{
"created": "Tue, 3 Oct 1995 18:02:29 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
]
] |
We show that the presence of an anomalous $\rm U_A(1)$ factor in the gauge group of string-derived models may have the new and important phenomenological consequence of allowing the vanishing of ${\rm Str}\,{\cal M}^2$ in the ``shifted" vacuum, that results in the process of cancelling the anomalous $\rm U_A(1)$. The feasibility of this effect seems to be enhanced by a vanishing vacuum energy, and by a ``small" value of ${\rm Str}\,{\cal M}^2$ in the original vacuum. In the class of free-fermionic models with vanishing vacuum energy that we focus on, a necessary condition for this mechanism to be effective is that ${\rm Str}\,{\cal M}^2>0$ in the original vacuum. A vanishing ${\rm Str}\,{\cal M}^2$ ameliorates the cosmological constant problem and is a necessary element in the stability of the no-scale mechanism.
|
2304.02060
|
Zhanduo Tang
|
Zhanduo Tang and Ralf Rapp
|
Spin-Dependent Interactions and Heavy-Quark Transport in the QGP
|
17 pages, 11 figures
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We extend a previously constructed T-matrix approach to the quark-gluon
plasma (QGP) to include the effects of spin-dependent interactions between
partons. Following earlier work within the relativistic quark model, the
spin-dependent interactions figure as relativistic corrections to the Cornell
potential. When applied to the vacuum spectroscopy of quarkonia, in particular
their mass splittings in S- and P-wave states, the issue of the Lorentz
structure of the confining potential arises. We confirm that a significant
admixture of a vector interaction (to the previously assumed scalar
interaction) improves the description of the experimental mass splittings. The
temperature corrections to the in-medium potential are constrained by results
from thermal lattice-QCD for the equation of state (EoS) and heavy-quark (HQ)
free energy in a selfconsistent set-up for heavy- and light-parton spectral
functions in the QGP. We then deploy the refined in-medium heavy-light T-matrix
to compute the charm-quark transport coefficients in the QGP. The vector
component of the confining potential, through its relativistic corrections,
enhances the friction coefficient for charm quarks in the QGP over previous
calculations by tens of percent at low momenta and temperatures, and more at
higher momenta. Our results are promising for improving the current
phenomenology of open heavy-flavor observables at Relativistic Heavy Ion
Collider (RHIC) and the Large Hadron Collider (LHC).
|
[
{
"created": "Tue, 4 Apr 2023 18:19:46 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Apr 2023 06:20:55 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Aug 2023 18:53:43 GMT",
"version": "v3"
}
] |
2023-08-10
|
[
[
"Tang",
"Zhanduo",
""
],
[
"Rapp",
"Ralf",
""
]
] |
We extend a previously constructed T-matrix approach to the quark-gluon plasma (QGP) to include the effects of spin-dependent interactions between partons. Following earlier work within the relativistic quark model, the spin-dependent interactions figure as relativistic corrections to the Cornell potential. When applied to the vacuum spectroscopy of quarkonia, in particular their mass splittings in S- and P-wave states, the issue of the Lorentz structure of the confining potential arises. We confirm that a significant admixture of a vector interaction (to the previously assumed scalar interaction) improves the description of the experimental mass splittings. The temperature corrections to the in-medium potential are constrained by results from thermal lattice-QCD for the equation of state (EoS) and heavy-quark (HQ) free energy in a selfconsistent set-up for heavy- and light-parton spectral functions in the QGP. We then deploy the refined in-medium heavy-light T-matrix to compute the charm-quark transport coefficients in the QGP. The vector component of the confining potential, through its relativistic corrections, enhances the friction coefficient for charm quarks in the QGP over previous calculations by tens of percent at low momenta and temperatures, and more at higher momenta. Our results are promising for improving the current phenomenology of open heavy-flavor observables at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC).
|
2203.07495
|
Sri Aditya Gadam
|
Wolfgang Altmannshofer, Sri Aditya Gadam, Stefano Profumo
|
Snowmass White Paper: Probing New Physics with $\mu^+ \mu^- \to bs$ at a
Muon Collider
|
Contribution to Snowmass 2021
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this white paper for the Snowmass process, we discuss the prospects of
probing new physics explanations of the persistent rare $B$ decay anomalies
with a muon collider. If the anomalies are indirect signs of heavy new physics,
non-standard rates for $\mu^+ \mu^- \to b s$ production should be observed with
high significance at a muon collider with center of mass energy of $\sqrt{s} =
10$ TeV. The forward-backward asymmetry of the $b$-jet provides diagnostics of
the chirality structure of the new physics couplings. In the absence of a
signal, $\mu^+ \mu^- \to b s$ can indirectly probe new physics scales as large
as $86$ TeV. Beam polarization would have an important impact on the new
physics sensitivity.
|
[
{
"created": "Mon, 14 Mar 2022 21:04:15 GMT",
"version": "v1"
}
] |
2022-03-16
|
[
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Gadam",
"Sri Aditya",
""
],
[
"Profumo",
"Stefano",
""
]
] |
In this white paper for the Snowmass process, we discuss the prospects of probing new physics explanations of the persistent rare $B$ decay anomalies with a muon collider. If the anomalies are indirect signs of heavy new physics, non-standard rates for $\mu^+ \mu^- \to b s$ production should be observed with high significance at a muon collider with center of mass energy of $\sqrt{s} = 10$ TeV. The forward-backward asymmetry of the $b$-jet provides diagnostics of the chirality structure of the new physics couplings. In the absence of a signal, $\mu^+ \mu^- \to b s$ can indirectly probe new physics scales as large as $86$ TeV. Beam polarization would have an important impact on the new physics sensitivity.
|
hep-ph/0301134
|
Stefan Michalski
|
Stefan Michalski
|
Nonequilibrium dynamics of the O(N) linear sigma model
|
Based on an article published in Phys.Rev.D65, 065019 (2002) written
in collaboration with Jurgen Baacke. Presented at International Workshop on
Strong and Electroweak Matter (SEWM 2002), Heidelberg, Germany, 2-5 Oct 2002
| null | null | null |
hep-ph
| null |
We investigate the out-of-equilibrium evolution of a classical background
field and its quantum fluctuations in the scalar O(N) model with spontaneous
symmetry breaking. We consider the 2-loop 2PI effective action in the Hartree
approximation, i.e., including bubble resummation but without non-local
contributions to the Dyson-Schwinger equation. We concentrate on the
(nonequilibrium) phase structure of the model and observe a first-order
transition between a spontaneously broken and a symmetric phase at low and high
energy densities, respectively. So typical structures expected in thermal
equilibrium are encountered in nonequilibrium dynamics even at early times
before thermalization.
|
[
{
"created": "Fri, 17 Jan 2003 12:56:56 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Michalski",
"Stefan",
""
]
] |
We investigate the out-of-equilibrium evolution of a classical background field and its quantum fluctuations in the scalar O(N) model with spontaneous symmetry breaking. We consider the 2-loop 2PI effective action in the Hartree approximation, i.e., including bubble resummation but without non-local contributions to the Dyson-Schwinger equation. We concentrate on the (nonequilibrium) phase structure of the model and observe a first-order transition between a spontaneously broken and a symmetric phase at low and high energy densities, respectively. So typical structures expected in thermal equilibrium are encountered in nonequilibrium dynamics even at early times before thermalization.
|
1510.00204
|
Pratishruti Saha
|
Pratishruti Saha, Ken Kiers, Bhubanjyoti Bhattacharya, David London,
Alejandro Szynkman, Jordan Melendez
|
Measuring CP-Violating Observables in Rare Top Decays at the LHC
|
Published version
|
Phys. Rev. D 93, 054044 (2016)
|
10.1103/PhysRevD.93.054044
|
UdeM-GPP-TH-15-243
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we consider CP-violating new-physics contributions to the decay
$t \to b \bar b c$. We examine the prospects for detecting such new physics at
the LHC, which requires studying the process $gg \to t (\to b \bar b c) \bar t
(\to \bar b \ell \bar \nu)$. We find two observables that can be used to reveal
the presence of CP-violating new physics in $t \to b \bar b c$. They are (i)
the partial-rate asymmetry and (ii) the triple-product correlations involving
the momenta of various particles associated with the interaction. A Monte Carlo
analysis is performed to determine how well these observables can be used to
detect the presence of new physics, and to measure its parameters. We find that
there is little difficulty in extracting the value of the relevant new-physics
parameter from the partial-rate asymmetry. For the triple-product correlations,
we test multiple strategies that can be used for the extraction of the
corresponding combination of new-physics parameters.
|
[
{
"created": "Thu, 1 Oct 2015 12:48:29 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Apr 2016 04:35:29 GMT",
"version": "v2"
}
] |
2016-04-25
|
[
[
"Saha",
"Pratishruti",
""
],
[
"Kiers",
"Ken",
""
],
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"London",
"David",
""
],
[
"Szynkman",
"Alejandro",
""
],
[
"Melendez",
"Jordan",
""
]
] |
In this paper we consider CP-violating new-physics contributions to the decay $t \to b \bar b c$. We examine the prospects for detecting such new physics at the LHC, which requires studying the process $gg \to t (\to b \bar b c) \bar t (\to \bar b \ell \bar \nu)$. We find two observables that can be used to reveal the presence of CP-violating new physics in $t \to b \bar b c$. They are (i) the partial-rate asymmetry and (ii) the triple-product correlations involving the momenta of various particles associated with the interaction. A Monte Carlo analysis is performed to determine how well these observables can be used to detect the presence of new physics, and to measure its parameters. We find that there is little difficulty in extracting the value of the relevant new-physics parameter from the partial-rate asymmetry. For the triple-product correlations, we test multiple strategies that can be used for the extraction of the corresponding combination of new-physics parameters.
|
1012.0245
|
Daniele Binosi
|
Daniele Binosi
|
A dynamical study of the Kugo-Ojima function
|
3 pages, 3 figures. Talk presented at the Quark Confinement and the
Hadron Spectrum - Madrid 2010, August 30th - September 3rd 2010, Madrid,
Spain
| null |
10.1063/1.3574963
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As has been recently realized, a certain two-point function $\Lambda$ -- and
its associated form factors G and L -- play a prominent role in the PT-BFM
formulation of the Schwinger-Dyson equations used to study gauge-invariantly
the gluon and ghost propagators. After showing that in the (background) Landau
gauge $\Lambda$ fully constrains the QCD ghost sector, we show that G coincides
with the Kugo-Ojima function u, whose infrared behavior has traditionally
served as the standard criterion for the realization of the Kugo-Ojima
confinement mechanism. The determination of the behavior of G for all momenta
through a combination of the available lattice data on the gluon and ghost
propagators, as well as the dynamical equation G satisfies, will be then
discussed. In particular we will show that in the deep infrared the function
deviates considerably from the value associated with the realization of the
Kugo-Ojima confinement scenario; the dependence on the renormalization point of
u, and especially of its value at q=0, will be also briefly discussed.
|
[
{
"created": "Wed, 1 Dec 2010 16:57:06 GMT",
"version": "v1"
}
] |
2015-05-20
|
[
[
"Binosi",
"Daniele",
""
]
] |
As has been recently realized, a certain two-point function $\Lambda$ -- and its associated form factors G and L -- play a prominent role in the PT-BFM formulation of the Schwinger-Dyson equations used to study gauge-invariantly the gluon and ghost propagators. After showing that in the (background) Landau gauge $\Lambda$ fully constrains the QCD ghost sector, we show that G coincides with the Kugo-Ojima function u, whose infrared behavior has traditionally served as the standard criterion for the realization of the Kugo-Ojima confinement mechanism. The determination of the behavior of G for all momenta through a combination of the available lattice data on the gluon and ghost propagators, as well as the dynamical equation G satisfies, will be then discussed. In particular we will show that in the deep infrared the function deviates considerably from the value associated with the realization of the Kugo-Ojima confinement scenario; the dependence on the renormalization point of u, and especially of its value at q=0, will be also briefly discussed.
|
2402.16491
|
Surender Verma Ph. D.
|
Tapender, Surender Verma and Sanjeev Kumar
|
On Lepton Flavor Violation and Dark Matter in Scotogenic model with
Trimaximal Mixing
|
40 pages, 11 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We examine the Scotogenic model employing the TM$_2$ mixing matrix,
$U_{\text{TM}_2}$, for neutrinos and parameterize the Yukawa coupling matrix
$y$ based on the diagonalization condition for the neutrino mass matrix,
$m_{\nu}$. Our investigation centers on analyzing the relic density of cold
dark matter ($\Omega h^2$) and possible lepton flavor violation (LFV) in the
model. In particular, we study coannihilation dynamics and LFV, in the model,
considering various coannihilation scenarios including non-zero mass splitting
between lightest sterile neutrinos. While analyzing, we have taken into
consideration respective experimental constraints on $\Omega h^2$ and LFV
alongside neutrino oscillation data. Our study reveals that in both normal and
inverted hierarchy of neutrino masses, splitting between masses of $N_1$ and
$N_2$ can be up to $\approx 15\%$ for the model to be in consonance with the
above constraints. In the second part, we have extended the analysis
incorporating extended magic symmetry in $m_\nu$ enabling us to completely
determine Yukawa coupling matrix ($y$). We observe a notable exclusion of the
effective Majorana mass $|m_{ee}|$ parameter space by cosmological bound on sum
of neutrino masses, particularly in the normal hierarchy while inverted
hierarchy scenario is excluded due to constraints coming from extended magic
symmetry. These findings shed light on the interplay among the Scotogenic
model, TM$_2$ mixing, and extended magic symmetry, offering insights into the
permitted parameter space and hierarchy exclusion.
|
[
{
"created": "Mon, 26 Feb 2024 11:16:25 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2024 06:39:59 GMT",
"version": "v2"
}
] |
2024-06-27
|
[
[
"Tapender",
"",
""
],
[
"Verma",
"Surender",
""
],
[
"Kumar",
"Sanjeev",
""
]
] |
We examine the Scotogenic model employing the TM$_2$ mixing matrix, $U_{\text{TM}_2}$, for neutrinos and parameterize the Yukawa coupling matrix $y$ based on the diagonalization condition for the neutrino mass matrix, $m_{\nu}$. Our investigation centers on analyzing the relic density of cold dark matter ($\Omega h^2$) and possible lepton flavor violation (LFV) in the model. In particular, we study coannihilation dynamics and LFV, in the model, considering various coannihilation scenarios including non-zero mass splitting between lightest sterile neutrinos. While analyzing, we have taken into consideration respective experimental constraints on $\Omega h^2$ and LFV alongside neutrino oscillation data. Our study reveals that in both normal and inverted hierarchy of neutrino masses, splitting between masses of $N_1$ and $N_2$ can be up to $\approx 15\%$ for the model to be in consonance with the above constraints. In the second part, we have extended the analysis incorporating extended magic symmetry in $m_\nu$ enabling us to completely determine Yukawa coupling matrix ($y$). We observe a notable exclusion of the effective Majorana mass $|m_{ee}|$ parameter space by cosmological bound on sum of neutrino masses, particularly in the normal hierarchy while inverted hierarchy scenario is excluded due to constraints coming from extended magic symmetry. These findings shed light on the interplay among the Scotogenic model, TM$_2$ mixing, and extended magic symmetry, offering insights into the permitted parameter space and hierarchy exclusion.
|
2010.06947
|
Nikolaos Syrrakos
|
Dhimiter D. Canko and Nikolaos Syrrakos
|
Resummation methods for Master Integrals
|
20 pages, 3 figures and 2 tables, section 3.3 rewritten, version
accepted for publication to JHEP
| null |
10.1007/JHEP02(2021)080
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present in detail two resummation methods emerging from the application of
the Simplified Differential Equations approach to a canonical basis of master
integrals. The first one is a method which allows for an easy determination of
the boundary conditions, since it finds relations between the boundaries of the
basis elements and the second one indicates how using the $x \rightarrow 1$
limit to the solutions of a canonical basis, one can obtain the solutions to a
canonical basis for the same problem with one mass less. Both methods utilise
the residue matrices for the letters $\{0,1\}$ of the canonical differential
equation. As proof of concept, we apply these methods to a canonical basis for
the three-loop ladder-box with one external mass off-shell, obtaining
subsequently a canonical basis for the massless three-loop ladder-box as well
as its solution.
|
[
{
"created": "Wed, 14 Oct 2020 10:50:55 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Nov 2020 11:10:49 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Dec 2020 08:52:23 GMT",
"version": "v3"
}
] |
2021-02-24
|
[
[
"Canko",
"Dhimiter D.",
""
],
[
"Syrrakos",
"Nikolaos",
""
]
] |
We present in detail two resummation methods emerging from the application of the Simplified Differential Equations approach to a canonical basis of master integrals. The first one is a method which allows for an easy determination of the boundary conditions, since it finds relations between the boundaries of the basis elements and the second one indicates how using the $x \rightarrow 1$ limit to the solutions of a canonical basis, one can obtain the solutions to a canonical basis for the same problem with one mass less. Both methods utilise the residue matrices for the letters $\{0,1\}$ of the canonical differential equation. As proof of concept, we apply these methods to a canonical basis for the three-loop ladder-box with one external mass off-shell, obtaining subsequently a canonical basis for the massless three-loop ladder-box as well as its solution.
|
2203.06262
|
Benjamin Monreal
|
Benjamin Monreal
|
High-pressure TPCs in pressurized caverns: opportunities in dark matter
and neutrino physics
|
Snowmass 2022 whitepaper, 14 pages, 2 figures
| null | null | null |
hep-ph nucl-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The natural gas and hydrogen storage industries have experience creating
huge, pressurized underground spaces. The most common of these is "solution
mining", a method for making brine-filled cavities in salt formations. Unlike
conventionally-mined underground spaces, these spaces are (a) inexpensive to
construct and operate, (b) naturally serve as pressure vessels, at size scales
impossible to construct in a conventional lab, and (b) permit safe use of
flammable and/or toxic materials. If various engineering challenges could be
met, solution-mined caverns would allow unprecedentedly-large high pressure gas
TPCs. Lined rock caverns (LRC) may permit high pressure TPCs of considerable
size in more conventional spaces. In this whitepaper, we review some of the new
physics opportunities available in these caverns and suggest an R&D program
needed to realize them.
|
[
{
"created": "Fri, 11 Mar 2022 21:41:38 GMT",
"version": "v1"
}
] |
2022-03-15
|
[
[
"Monreal",
"Benjamin",
""
]
] |
The natural gas and hydrogen storage industries have experience creating huge, pressurized underground spaces. The most common of these is "solution mining", a method for making brine-filled cavities in salt formations. Unlike conventionally-mined underground spaces, these spaces are (a) inexpensive to construct and operate, (b) naturally serve as pressure vessels, at size scales impossible to construct in a conventional lab, and (b) permit safe use of flammable and/or toxic materials. If various engineering challenges could be met, solution-mined caverns would allow unprecedentedly-large high pressure gas TPCs. Lined rock caverns (LRC) may permit high pressure TPCs of considerable size in more conventional spaces. In this whitepaper, we review some of the new physics opportunities available in these caverns and suggest an R&D program needed to realize them.
|
2404.00298
|
Xu Cao
|
Xu Cao, Yu-Tie Liang, Rong-Gang Ping
|
Production and decay of hyperons in a transversely polarized
electron-positron collider
|
10 pages, 7 figures, typos corrected, figures 3 and 7 updated,
published version
|
PHYS. REV. D 110, 014035 (2024)
|
10.1103/PhysRevD.110.014035
| null |
hep-ph
|
http://creativecommons.org/licenses/by-sa/4.0/
|
The self-polarization of relativistic electrons or positrons moving in a
magnetic field at a storage ring occurs through the emission of spin-flip
synchrotron radiation, known as the Sokolov-Ternov effect. The resulting
transverse polarizations of the colliding electrons and positrons, away from
the depolarization resonances, allow for precise investigation of the spin
entangled hyperon-antihyperon pairs via virtual photon or charmonium decay. The
feasibility study reveals a promising increase in the statistical sensitivity
of the \CP violation signal after considering the transverse polarizations of
the lepton beams.
|
[
{
"created": "Sat, 30 Mar 2024 09:22:37 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 2024 01:14:54 GMT",
"version": "v2"
}
] |
2024-07-24
|
[
[
"Cao",
"Xu",
""
],
[
"Liang",
"Yu-Tie",
""
],
[
"Ping",
"Rong-Gang",
""
]
] |
The self-polarization of relativistic electrons or positrons moving in a magnetic field at a storage ring occurs through the emission of spin-flip synchrotron radiation, known as the Sokolov-Ternov effect. The resulting transverse polarizations of the colliding electrons and positrons, away from the depolarization resonances, allow for precise investigation of the spin entangled hyperon-antihyperon pairs via virtual photon or charmonium decay. The feasibility study reveals a promising increase in the statistical sensitivity of the \CP violation signal after considering the transverse polarizations of the lepton beams.
|
hep-ph/9212234
| null |
Michael J. Booth and Gerard Jungman
|
P and T Violation From Certain Dimension Eight Weinberg Operators
|
6 pages, EFI-92-51
|
Phys.Rev.D47:4828-4829,1993
|
10.1103/PhysRevD.47.R4828
| null |
hep-ph
| null |
Dimension eight operators of the Weinberg type have been shown to give
important contributions to CP violating phenomena, such as the electric dipole
moment of the neutron. In this note we show how operators related to these (and
expected to occur on equal footing) can give rise to time-reversal violating
phenomena such as atomic electric dipole moments. We also estimate the induced
parity violating phenomena such as small ``wrong'' parity admixtures in atomic
states and find that they are negligible. Uses harvmac.tex and epsf.tex; one
figure submitted as a uuencoded, compressed EPS file.
|
[
{
"created": "Tue, 8 Dec 1992 01:15:07 GMT",
"version": "v1"
}
] |
2009-12-30
|
[
[
"Booth",
"Michael J.",
""
],
[
"Jungman",
"Gerard",
""
]
] |
Dimension eight operators of the Weinberg type have been shown to give important contributions to CP violating phenomena, such as the electric dipole moment of the neutron. In this note we show how operators related to these (and expected to occur on equal footing) can give rise to time-reversal violating phenomena such as atomic electric dipole moments. We also estimate the induced parity violating phenomena such as small ``wrong'' parity admixtures in atomic states and find that they are negligible. Uses harvmac.tex and epsf.tex; one figure submitted as a uuencoded, compressed EPS file.
|
1901.05863
|
Jean-Rene Cudell
|
J.R. Cudell and O.V. Selyugin
|
TOTEM data and the real part of the hadron elastic amplitude at 13 TeV
|
9 pages, 5 figures. New section on the evaluation of the theoretical
error
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse the 13 TeV TOTEM data on elastic proton-proton scattering through
a thorough statistical analysis, and obtain that $\rho=0.096\pm 0.006$ and
$\sigma_{tot}=(107.5\pm 1.5)$ mb. Theoretical errors could lower the cross
section by about 2 mb and increase $\rho$ by about 0.002. We also show that
these results do not imply the existence of an odderon at $t=0$.
|
[
{
"created": "Thu, 17 Jan 2019 16:10:28 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2019 15:12:21 GMT",
"version": "v2"
}
] |
2019-05-22
|
[
[
"Cudell",
"J. R.",
""
],
[
"Selyugin",
"O. V.",
""
]
] |
We analyse the 13 TeV TOTEM data on elastic proton-proton scattering through a thorough statistical analysis, and obtain that $\rho=0.096\pm 0.006$ and $\sigma_{tot}=(107.5\pm 1.5)$ mb. Theoretical errors could lower the cross section by about 2 mb and increase $\rho$ by about 0.002. We also show that these results do not imply the existence of an odderon at $t=0$.
|
2403.09511
|
Xiao-Hui Hu
|
Xiao-Hui Hu, Cai Ping Jia, Fu Sheng Yu, Ye Xing
|
The study of weak decays of doubly charmed baryons within rescattering
mechanism
|
22 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The doubly charmed baryon $\Xi_{cc}^{++}$ has been observed by LHCb through
the non-leptonic decay modes of
$\Xi_{cc}^{++}\to\Lambda_{c}^{+}K^{-}\pi^{+}\pi^{+}$ and $\Xi_{c}^{+}\pi^{+}$
in 2017. After that, the experimentalists turn their attention to finding other
doubly charmed baryons $\Xi_{cc}^{+}$ and $\Omega_{cc}^{+}$. In this work, we
investigate the nonleptonic weak decays of doubly charmed baryons ${\cal
B}_{cc}\to{\cal B}_{c}P$, where ${\cal B}_{cc}$ denotes the doubly charmed
baryons $(\Xi_{cc}^{++},\Xi_{cc}^{+},\Omega_{cc}^{+})$, ${\cal B}_{c}$
represents the singly charmed baryons $({\cal B}_{\bar{3}},{\cal B}_{6})$ and
$P$ is the light pseudoscalar. For these non-leptonic decay modes, their
short-distance contributions can be accurately estimated in theoretical
calculations. However, dealing with the long-distance contributions for
final-state-interaction effects is challenging. To address this, we use the
rescattering mechanism to calculate the long-distance contributions and first
derive the whole hadronic loop contributions for these two-body nonleptonic
decays of doubly charmed baryons. Then the decay widths and branching ratios of
the 45 nonleptonic decays of doubly charmed baryon are predicted. Among that,
the ratio of the branching ratios ${\cal RB}=\frac{{\cal
B}(\Xi_{cc}^{++}\to\Xi_{c}^{\prime+}\pi^{+})}{{\cal
B}(\Xi_{cc}^{++}\to\Xi_{c}^{+}\pi^{+})}=1.15\pm0.45$ is consistent with the
experimental results within statistical errors.
|
[
{
"created": "Thu, 14 Mar 2024 15:56:41 GMT",
"version": "v1"
}
] |
2024-03-15
|
[
[
"Hu",
"Xiao-Hui",
""
],
[
"Jia",
"Cai Ping",
""
],
[
"Yu",
"Fu Sheng",
""
],
[
"Xing",
"Ye",
""
]
] |
The doubly charmed baryon $\Xi_{cc}^{++}$ has been observed by LHCb through the non-leptonic decay modes of $\Xi_{cc}^{++}\to\Lambda_{c}^{+}K^{-}\pi^{+}\pi^{+}$ and $\Xi_{c}^{+}\pi^{+}$ in 2017. After that, the experimentalists turn their attention to finding other doubly charmed baryons $\Xi_{cc}^{+}$ and $\Omega_{cc}^{+}$. In this work, we investigate the nonleptonic weak decays of doubly charmed baryons ${\cal B}_{cc}\to{\cal B}_{c}P$, where ${\cal B}_{cc}$ denotes the doubly charmed baryons $(\Xi_{cc}^{++},\Xi_{cc}^{+},\Omega_{cc}^{+})$, ${\cal B}_{c}$ represents the singly charmed baryons $({\cal B}_{\bar{3}},{\cal B}_{6})$ and $P$ is the light pseudoscalar. For these non-leptonic decay modes, their short-distance contributions can be accurately estimated in theoretical calculations. However, dealing with the long-distance contributions for final-state-interaction effects is challenging. To address this, we use the rescattering mechanism to calculate the long-distance contributions and first derive the whole hadronic loop contributions for these two-body nonleptonic decays of doubly charmed baryons. Then the decay widths and branching ratios of the 45 nonleptonic decays of doubly charmed baryon are predicted. Among that, the ratio of the branching ratios ${\cal RB}=\frac{{\cal B}(\Xi_{cc}^{++}\to\Xi_{c}^{\prime+}\pi^{+})}{{\cal B}(\Xi_{cc}^{++}\to\Xi_{c}^{+}\pi^{+})}=1.15\pm0.45$ is consistent with the experimental results within statistical errors.
|
hep-ph/0101184
|
Khrykin
|
A.S.Khrykin
|
Study of two-photon production process in proton-proton collisions below
the pion production threshold
|
6 pages, LaTex, 2 eps-figures; Talk given at the XV International
Seminar on High Energy Physics Problems, Dubna, Russia, September 25-29,2000,
to be published in the proceeding
| null | null | null |
hep-ph
| null |
The energy spectrum for high energy $\gamma$-rays ($E_\gamma \geq 10$ MeV)
from the process $pp \to \gamma \gamma X$ emitted at $90^0$ in the laboratory
frame has been measured at an energy below the pion production threshold,
namely, at 216 MeV. The resulting photon energy spectrum extracted from $\gamma
- \gamma$ coincidence events consists of a narrow peak at a photon energy of
about 24 MeV and a relatively broad peak in the energy range of (50 - 70) MeV.
The statistical significance for both the narrow and broad peaks exceeds
5$\sigma$. This behavior of the photon energy spectrum is interpreted as a
signature of the exotic dibaryon resonance $d^\star_1$ which is assumed to be
formed in the radiative process $pp \to \gamma d^\star_1$ followed by its
electromagnetic decay via the $d^\star_1 \to pp \gamma$ mode. The experimental
spectrum is compared with those obtained by means of Monte Carlo simulations.
|
[
{
"created": "Tue, 16 Jan 2001 17:33:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Khrykin",
"A. S.",
""
]
] |
The energy spectrum for high energy $\gamma$-rays ($E_\gamma \geq 10$ MeV) from the process $pp \to \gamma \gamma X$ emitted at $90^0$ in the laboratory frame has been measured at an energy below the pion production threshold, namely, at 216 MeV. The resulting photon energy spectrum extracted from $\gamma - \gamma$ coincidence events consists of a narrow peak at a photon energy of about 24 MeV and a relatively broad peak in the energy range of (50 - 70) MeV. The statistical significance for both the narrow and broad peaks exceeds 5$\sigma$. This behavior of the photon energy spectrum is interpreted as a signature of the exotic dibaryon resonance $d^\star_1$ which is assumed to be formed in the radiative process $pp \to \gamma d^\star_1$ followed by its electromagnetic decay via the $d^\star_1 \to pp \gamma$ mode. The experimental spectrum is compared with those obtained by means of Monte Carlo simulations.
|
hep-ph/0403236
|
Werner Rodejohann
|
W. Rodejohann
|
Type II See-Saw Mechanism, Deviations from Bimaximal Neutrino Mixing and
Leptogenesis
|
22 pages, 3 figures. Final corrections, matches version in PRD
|
Phys.Rev.D70:073010,2004
|
10.1103/PhysRevD.70.073010
|
SISSA 22/2004/EP
|
hep-ph
| null |
A possible interplay of both terms in the type II see-saw formula is
illustrated by presenting a novel way to generate deviations from exact
bimaximal neutrino mixing. In type II see-saw mechanism with dominance of the
non-canonical SU(2)_L triplet term, the conventional see-saw term can give a
small contribution to the neutrino mass matrix. If the triplet term corresponds
to the bimaximal mixing scheme in the normal hierarchy, the small contribution
of the conventional see-saw term naturally generates non-maximal solar neutrino
mixing. Atmospheric neutrino mixing is also reduced from maximal, corresponding
to 1 - \sin^2 2 \theta_{23} of order 0.01. Also, small but non-vanishing U_{e3}
of order 0.001 is obtained. It is also possible that the \Delta m^2 responsible
for solar neutrino oscillations is induced by the small conventional see-saw
term. Larger deviations from zero U_{e3} and from maximal atmospheric neutrino
mixing are then expected. This scenario links the small ratio of the solar and
atmospheric \Delta m^2 with the deviation from maximal solar neutrino mixing.
We comment on leptogenesis in this scenario and compare the contributions to
the decay asymmetry of the heavy Majorana neutrinos as induced by themselves
and by the triplet.
|
[
{
"created": "Mon, 22 Mar 2004 14:11:35 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 2004 09:24:30 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jul 2004 13:53:52 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Oct 2004 13:31:25 GMT",
"version": "v4"
}
] |
2014-11-17
|
[
[
"Rodejohann",
"W.",
""
]
] |
A possible interplay of both terms in the type II see-saw formula is illustrated by presenting a novel way to generate deviations from exact bimaximal neutrino mixing. In type II see-saw mechanism with dominance of the non-canonical SU(2)_L triplet term, the conventional see-saw term can give a small contribution to the neutrino mass matrix. If the triplet term corresponds to the bimaximal mixing scheme in the normal hierarchy, the small contribution of the conventional see-saw term naturally generates non-maximal solar neutrino mixing. Atmospheric neutrino mixing is also reduced from maximal, corresponding to 1 - \sin^2 2 \theta_{23} of order 0.01. Also, small but non-vanishing U_{e3} of order 0.001 is obtained. It is also possible that the \Delta m^2 responsible for solar neutrino oscillations is induced by the small conventional see-saw term. Larger deviations from zero U_{e3} and from maximal atmospheric neutrino mixing are then expected. This scenario links the small ratio of the solar and atmospheric \Delta m^2 with the deviation from maximal solar neutrino mixing. We comment on leptogenesis in this scenario and compare the contributions to the decay asymmetry of the heavy Majorana neutrinos as induced by themselves and by the triplet.
|
1110.4450
|
Iason Baldes
|
Iason Baldes, Nicole F. Bell, Raymond R. Volkas
|
Baryon Number Violating Scalar Diquarks at the LHC
|
10 pages, 9 figures. v2: references added, some typos corrected. v3:
some small corrections to match published version, no change in conclusions
|
Phys. Rev. D 84, 115019 (2011)
|
10.1103/PhysRevD.84.115019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Baryon number violating (BNV) processes are heavily constrained by
experiments searching for nucleon decay and neutron-antineutron oscillations.
If the baryon number violation occurs via the third generation quarks, however,
we may be able to avoid the nucleon stability constraints, thus making such BNV
interactions accessible at the LHC. In this paper we study a specific class of
BNV extensions of the standard model (SM) involving diquark and leptoquark
scalars. After an introduction to these models we study one promising extension
in detail, being interested in particles with mass of O(TeV). We calculate
limits on the masses and couplings from neutron-antineutron oscillations and
dineutron decay for couplings to first and third generation quarks. We explore
the possible consequences of such a model on the matter-antimatter asymmetry.
We shall see that for models which break the global baryon minus lepton number
symmetry, (B-L), the most stringent constraints come from the need to preserve
a matter-antimatter asymmetry. That is, the BNV interaction cannot be
introduced if it would remove the matter-antimatter asymmetry independent of
baryogenesis mechanism and temperature. Finally, we examine the phenomenology
of such models at colliders such as the LHC.
|
[
{
"created": "Thu, 20 Oct 2011 05:52:21 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2011 06:47:37 GMT",
"version": "v2"
},
{
"created": "Wed, 9 May 2012 07:29:00 GMT",
"version": "v3"
}
] |
2012-05-10
|
[
[
"Baldes",
"Iason",
""
],
[
"Bell",
"Nicole F.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] |
Baryon number violating (BNV) processes are heavily constrained by experiments searching for nucleon decay and neutron-antineutron oscillations. If the baryon number violation occurs via the third generation quarks, however, we may be able to avoid the nucleon stability constraints, thus making such BNV interactions accessible at the LHC. In this paper we study a specific class of BNV extensions of the standard model (SM) involving diquark and leptoquark scalars. After an introduction to these models we study one promising extension in detail, being interested in particles with mass of O(TeV). We calculate limits on the masses and couplings from neutron-antineutron oscillations and dineutron decay for couplings to first and third generation quarks. We explore the possible consequences of such a model on the matter-antimatter asymmetry. We shall see that for models which break the global baryon minus lepton number symmetry, (B-L), the most stringent constraints come from the need to preserve a matter-antimatter asymmetry. That is, the BNV interaction cannot be introduced if it would remove the matter-antimatter asymmetry independent of baryogenesis mechanism and temperature. Finally, we examine the phenomenology of such models at colliders such as the LHC.
|
1712.04527
|
Till Martini
|
Till Martini and Peter Uwer
|
The Matrix Element Method at next-to-leading order QCD for hadronic
collisions: Single top-quark production at the LHC as an example application
|
references and clarifications added, typos corrected, matches
published version
|
JHEP05(2018)141
|
10.1007/JHEP05(2018)141
|
HU-EP-17/28
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent work the authors have presented a general algorithm to extend the
Matrix Element Method (MEM) to the hadronic production of coloured partons
taking into account next-to-leading-order (NLO) corrections in quantum
chromodynamics (QCD). In this article, the general algorithm is applied to the
production of single top quarks at the LHC. In particular, the generation of
unweighted events following the NLO predictions is presented. Treating these
events as the result of a toy experiment we illustrate the first application of
the Matrix Element Method at NLO QCD for hadronic jet production. As a concrete
example, we study the determination of the top-quark mass. We show that the
inclusion of the NLO corrections can lead to sizeable effects compared to the
Matrix Element Method relying on leading-order predictions only and that the
incorporation of the NLO corrections is mandatory to obtain reliable estimates
of the theoretical uncertainties. In addition, we find that measuring the
top-quark mass using the MEM in single top-quark production offers an
interesting alternative to mass measurements in top-quark pair production.
|
[
{
"created": "Tue, 12 Dec 2017 21:21:36 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2018 09:55:17 GMT",
"version": "v2"
}
] |
2018-05-28
|
[
[
"Martini",
"Till",
""
],
[
"Uwer",
"Peter",
""
]
] |
In a recent work the authors have presented a general algorithm to extend the Matrix Element Method (MEM) to the hadronic production of coloured partons taking into account next-to-leading-order (NLO) corrections in quantum chromodynamics (QCD). In this article, the general algorithm is applied to the production of single top quarks at the LHC. In particular, the generation of unweighted events following the NLO predictions is presented. Treating these events as the result of a toy experiment we illustrate the first application of the Matrix Element Method at NLO QCD for hadronic jet production. As a concrete example, we study the determination of the top-quark mass. We show that the inclusion of the NLO corrections can lead to sizeable effects compared to the Matrix Element Method relying on leading-order predictions only and that the incorporation of the NLO corrections is mandatory to obtain reliable estimates of the theoretical uncertainties. In addition, we find that measuring the top-quark mass using the MEM in single top-quark production offers an interesting alternative to mass measurements in top-quark pair production.
|
1111.0805
|
Bartolome Alles
|
B. Alles
|
Relativity accommodates superluminal mean velocities
|
5 pages; Latex source, 2 eps figures (expanded discussion, a few
typos corrected, some refs. added)
|
Phys. Rev. D 85, 047501 (2012)
|
10.1103/PhysRevD.85.047501
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Contrary to a widespread belief, measures of velocity can yield a value
larger than $c$, the instantaneous light speed in vacuum, without contradicting
Einstein's relativity. Nevertheless, the effect turns out to be too small to
explain the recently claimed superluminal velocity by the OPERA collaboration.
Several other general relativistic effects acting on the OPERA neutrinos are
also analyzed. All of them are unable to explain the OPERA result.
|
[
{
"created": "Thu, 3 Nov 2011 11:54:47 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2012 10:31:04 GMT",
"version": "v2"
}
] |
2012-02-24
|
[
[
"Alles",
"B.",
""
]
] |
Contrary to a widespread belief, measures of velocity can yield a value larger than $c$, the instantaneous light speed in vacuum, without contradicting Einstein's relativity. Nevertheless, the effect turns out to be too small to explain the recently claimed superluminal velocity by the OPERA collaboration. Several other general relativistic effects acting on the OPERA neutrinos are also analyzed. All of them are unable to explain the OPERA result.
|
hep-ph/9709450
|
Howard Haber
|
Howard E. Haber (Santa Cruz Institute for Particle Physics)
|
The Status of the Minimal Supersymmetric Standard Model and Beyond
|
17 pages, LaTeX, with espcrc2.sty style file, to appear in the
Proceedings of the 5th International Conference on Supersymmetries in Physics
(SUSY 97)
|
Nucl.Phys.Proc.Suppl.62:469-484,1998
|
10.1016/S0920-5632(97)00688-9
|
SCIPP 97/27
|
hep-ph
| null |
The minimal supersymmetric extension of the Standard Model (MSSM) is
reviewed. In the most general framework with minimal field content and R-parity
conservation, the MSSM is a 124-parameter model (henceforth called MSSM-124).
An acceptable phenomenology occurs only at exceptional points (and small
perturbations around these points) of MSSM-124 parameter space. Among the
topics addressed in this review are: gauge coupling unification, precision
electroweak data, phenomenology of the MSSM Higgs sector, and supersymmetry
searches at present and future colliders. The implications of approaches beyond
the MSSM are briefly addressed.
|
[
{
"created": "Thu, 25 Sep 1997 00:45:51 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Haber",
"Howard E.",
"",
"Santa Cruz Institute for Particle Physics"
]
] |
The minimal supersymmetric extension of the Standard Model (MSSM) is reviewed. In the most general framework with minimal field content and R-parity conservation, the MSSM is a 124-parameter model (henceforth called MSSM-124). An acceptable phenomenology occurs only at exceptional points (and small perturbations around these points) of MSSM-124 parameter space. Among the topics addressed in this review are: gauge coupling unification, precision electroweak data, phenomenology of the MSSM Higgs sector, and supersymmetry searches at present and future colliders. The implications of approaches beyond the MSSM are briefly addressed.
|
2012.13856
|
Sourendu Gupta
|
Saumen Datta, Sourendu Gupta, Rishi Sharma
|
Fun with colours: the standard model with two colour QCD has radically
different long distance physics
|
Submitted to Indian Journal of Physics memorial issue for Pushan
Majumdar
| null | null | null |
hep-ph astro-ph.HE hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In our world the standard model of particle physics contains within it the
fairly intractable theory called QCD. A toy version with two colours is often
studied as a model confining and chiral symmetry breaking field theory. Here we
investigate the cascade of changes at various distance scales if we make this
change within the standard model. It is possible to limit the changes at the
hadronic scale. However, the minor changes that occur actually cascade down to
the far infrared, into nuclear and atomic physics, and chemistry. Through this
it also possibly affects the evolution of stars and galaxies. We remark on this
unexpected sensitivity of the universe to physics at the scale of quarks.
|
[
{
"created": "Sun, 27 Dec 2020 02:46:30 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2021 10:36:20 GMT",
"version": "v2"
}
] |
2021-04-21
|
[
[
"Datta",
"Saumen",
""
],
[
"Gupta",
"Sourendu",
""
],
[
"Sharma",
"Rishi",
""
]
] |
In our world the standard model of particle physics contains within it the fairly intractable theory called QCD. A toy version with two colours is often studied as a model confining and chiral symmetry breaking field theory. Here we investigate the cascade of changes at various distance scales if we make this change within the standard model. It is possible to limit the changes at the hadronic scale. However, the minor changes that occur actually cascade down to the far infrared, into nuclear and atomic physics, and chemistry. Through this it also possibly affects the evolution of stars and galaxies. We remark on this unexpected sensitivity of the universe to physics at the scale of quarks.
|
1807.01481
|
Ujjal Kumar Dey
|
Cheng-Wei Chiang, Ujjal Kumar Dey, Tapoja Jha
|
$t\to cg$ and $t\to cZ$ in Universal Extra Dimensional Models
|
27 pages, 9 figures; minor changes in text; matches published version
|
Eur. Phys. J. Plus (2019) 134: 210
|
10.1140/epjp/i2019-12607-1
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we perform a complete one-loop calculation of the
flavor-changing top quark decays $t\to cg$ and $t\to cZ$ in the universal extra
dimensional models. We find that the branching ratios of these decays in the
minimal scenario remain unaltered from the Standard Model expectations for
currently allowed values of the inverse compactification radius. In the
non-minimal setup, the branching ratios can be enhanced from the Standard Model
due to the presence of boundary localized terms which modify the mass spectrum
and couplings in the theory in a non-trivial way. We also check the
compatibility of the parameter choices that result in enhancements in these
rare decays with other experimental observations.
|
[
{
"created": "Wed, 4 Jul 2018 08:38:59 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 08:00:26 GMT",
"version": "v2"
}
] |
2019-05-17
|
[
[
"Chiang",
"Cheng-Wei",
""
],
[
"Dey",
"Ujjal Kumar",
""
],
[
"Jha",
"Tapoja",
""
]
] |
In this work we perform a complete one-loop calculation of the flavor-changing top quark decays $t\to cg$ and $t\to cZ$ in the universal extra dimensional models. We find that the branching ratios of these decays in the minimal scenario remain unaltered from the Standard Model expectations for currently allowed values of the inverse compactification radius. In the non-minimal setup, the branching ratios can be enhanced from the Standard Model due to the presence of boundary localized terms which modify the mass spectrum and couplings in the theory in a non-trivial way. We also check the compatibility of the parameter choices that result in enhancements in these rare decays with other experimental observations.
|
0907.0153
|
Daniele Binosi
|
A. C. Aguilar, D. Binosi and J. Papavassiliou
|
Indirect determination of the Kugo-Ojima function from lattice data
|
25 pages, 10 figures; v2: typos corrected, expanded version that
matches the published article
|
JHEP 0911:066,2009
|
10.1088/1126-6708/2009/11/066
|
ECT*-09-04
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the structure and non-perturbative properties of a special Green's
function, u(q), whose infrared behavior has traditionally served as the
standard criterion for the realization of the Kugo-Ojima confinement mechanism.
It turns out that, in the Landau gauge, u(q) can be determined from a dynamical
equation, whose main ingredients are the gluon propagator and the ghost
dressing function, integrated over all physical momenta. Using as input for
these two (infrared finite) quantities recent lattice data, we obtain an
indirect determination of u(q). The results of this mixed procedure are in
excellent agreement with those found previously on the lattice, through a
direct simulation of this function. Most importantly, in the deep infrared the
function deviates considerably from the value associated with the realization
of the aforementioned confinement scenario. In addition, the dependence of
u(q), and especially of its value at the origin, on the renormalization point
is clearly established. Some of the possible implications of these results are
briefly discussed.
|
[
{
"created": "Wed, 1 Jul 2009 14:35:38 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2011 10:45:57 GMT",
"version": "v2"
}
] |
2011-07-20
|
[
[
"Aguilar",
"A. C.",
""
],
[
"Binosi",
"D.",
""
],
[
"Papavassiliou",
"J.",
""
]
] |
We study the structure and non-perturbative properties of a special Green's function, u(q), whose infrared behavior has traditionally served as the standard criterion for the realization of the Kugo-Ojima confinement mechanism. It turns out that, in the Landau gauge, u(q) can be determined from a dynamical equation, whose main ingredients are the gluon propagator and the ghost dressing function, integrated over all physical momenta. Using as input for these two (infrared finite) quantities recent lattice data, we obtain an indirect determination of u(q). The results of this mixed procedure are in excellent agreement with those found previously on the lattice, through a direct simulation of this function. Most importantly, in the deep infrared the function deviates considerably from the value associated with the realization of the aforementioned confinement scenario. In addition, the dependence of u(q), and especially of its value at the origin, on the renormalization point is clearly established. Some of the possible implications of these results are briefly discussed.
|
0811.0847
|
Nicole F. Bell
|
Nicole F. Bell
|
Probing New Physics with Astrophysical Neutrinos
|
6 pages, 2 figures. Talk given at Neutrino 2008, Christchurch, New
Zealand, May 2008
|
J.Phys.Conf.Ser.136:022043,2008
|
10.1088/1742-6596/136/2/022043
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the prospects for probing new physics with neutrino astrophysics.
High energy neutrinos provide an important means of accessing physics beyond
the electroweak scale. Neutrinos have a number of advantages over conventional
astronomy and, in particular, carry information encoded in their flavor degree
of freedom which could reveal a variety of exotic neutrino properties. We also
outline ways in which neutrino astrophysics can be used to constrain dark
matter properties, and explain how neutrino-based limits lead to a strong
general bound on the dark matter total annihilation cross-section.
|
[
{
"created": "Thu, 6 Nov 2008 00:36:04 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Bell",
"Nicole F.",
""
]
] |
We review the prospects for probing new physics with neutrino astrophysics. High energy neutrinos provide an important means of accessing physics beyond the electroweak scale. Neutrinos have a number of advantages over conventional astronomy and, in particular, carry information encoded in their flavor degree of freedom which could reveal a variety of exotic neutrino properties. We also outline ways in which neutrino astrophysics can be used to constrain dark matter properties, and explain how neutrino-based limits lead to a strong general bound on the dark matter total annihilation cross-section.
|
1510.02110
|
Felix Kahlhoefer
|
Felix Kahlhoefer (DESY), Kai Schmidt-Hoberg (DESY), Thomas Schwetz
(KIT), Stefan Vogl (Stockholm & KIT)
|
Implications of unitarity and gauge invariance for simplified dark
matter models
|
25 pages + appendices, 10 figures; v2: monojet bounds added, relic
density calculation corrected, discussion of small couplings included,
matches published version
|
JHEP 1602 (2016) 016
|
10.1007/JHEP02(2016)016
|
DESY 15-182
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that simplified models used to describe the interactions of dark
matter with Standard Model particles do not in general respect gauge invariance
and that perturbative unitarity may be violated in large regions of the
parameter space. The modifications necessary to cure these inconsistencies may
imply a much richer phenomenology and lead to stringent constraints on the
model. We illustrate these observations by considering the simplified model of
a fermionic dark matter particle and a vector mediator. Imposing gauge
invariance then leads to strong constraints from dilepton resonance searches
and electroweak precision tests. Furthermore, the new states required to
restore perturbative unitarity can mix with Standard Model states and mediate
interactions between the dark and the visible sector, leading to new
experimental signatures such as invisible Higgs decays. The resulting
constraints are typically stronger than the 'classic' constraints on DM
simplified models such as monojet searches and make it difficult to avoid
thermal overproduction of dark matter.
|
[
{
"created": "Wed, 7 Oct 2015 20:18:20 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2016 10:55:37 GMT",
"version": "v2"
}
] |
2016-02-10
|
[
[
"Kahlhoefer",
"Felix",
"",
"DESY"
],
[
"Schmidt-Hoberg",
"Kai",
"",
"DESY"
],
[
"Schwetz",
"Thomas",
"",
"KIT"
],
[
"Vogl",
"Stefan",
"",
"Stockholm & KIT"
]
] |
We show that simplified models used to describe the interactions of dark matter with Standard Model particles do not in general respect gauge invariance and that perturbative unitarity may be violated in large regions of the parameter space. The modifications necessary to cure these inconsistencies may imply a much richer phenomenology and lead to stringent constraints on the model. We illustrate these observations by considering the simplified model of a fermionic dark matter particle and a vector mediator. Imposing gauge invariance then leads to strong constraints from dilepton resonance searches and electroweak precision tests. Furthermore, the new states required to restore perturbative unitarity can mix with Standard Model states and mediate interactions between the dark and the visible sector, leading to new experimental signatures such as invisible Higgs decays. The resulting constraints are typically stronger than the 'classic' constraints on DM simplified models such as monojet searches and make it difficult to avoid thermal overproduction of dark matter.
|
hep-ph/0312145
|
Ulrich Nierste
|
Sebastian Jager and Ulrich Nierste
|
B_s-B_s-bar mixing in an SO(10) SUSY GUT model
|
4 pages, 2 figures
|
Eur.Phys.J.C33:s256-s258,2004
|
10.1140/epjcd/s2004-03-1581-y
|
FERMILAB-Conf-03/394-T
|
hep-ph
| null |
We perform a renormalisation group analysis of the SO(10) model proposed by
Chang, Masiero and Murayama, which links the large atmospheric neutrino mixing
angle to loop-induced transitions between right-handed b and s quarks. We
compute the impact on B_s-B_s-bar mixing and find that the mass difference in
the B_s system can exceed its Standard Model value by a factor of 16.
|
[
{
"created": "Wed, 10 Dec 2003 21:19:42 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Jager",
"Sebastian",
""
],
[
"Nierste",
"Ulrich",
""
]
] |
We perform a renormalisation group analysis of the SO(10) model proposed by Chang, Masiero and Murayama, which links the large atmospheric neutrino mixing angle to loop-induced transitions between right-handed b and s quarks. We compute the impact on B_s-B_s-bar mixing and find that the mass difference in the B_s system can exceed its Standard Model value by a factor of 16.
|
1401.4229
|
Raquel Molina Ms.
|
R. Molina, A. Hosaka and H. Nagahiro
|
Decays of double charmed meson molecules
|
5 pages, 1 table, 1 figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The interaction between pseudoscalar and/or vector mesons can be studied
using hidden gauge Lagrangians. In this framework, the interaction between
charmed mesons has been studied. Furthermore, doubly charmed states are also
predicted. These new states are near the $D^*D^*$ and $D^*D^*_s$ thresholds,
and have spin-parity $J^P=1^+$. We evaluate the decay widths of these states,
named as $R_{cc}(3970)$ and $S_{cc}(4100)$ (with strangeness), and obtain $44$
MeV for the non-strangeness, and $24$ MeV for the doubly charm-strange state.
Essentially, the decay modes are $DD_{(s)}\pi$ and $DD_{(s)}\gamma$, being the
$D\pi$ and $D\gamma$ emitted by one of the $D^*$ meson which forms the
molecule.
|
[
{
"created": "Fri, 17 Jan 2014 02:52:07 GMT",
"version": "v1"
}
] |
2014-01-20
|
[
[
"Molina",
"R.",
""
],
[
"Hosaka",
"A.",
""
],
[
"Nagahiro",
"H.",
""
]
] |
The interaction between pseudoscalar and/or vector mesons can be studied using hidden gauge Lagrangians. In this framework, the interaction between charmed mesons has been studied. Furthermore, doubly charmed states are also predicted. These new states are near the $D^*D^*$ and $D^*D^*_s$ thresholds, and have spin-parity $J^P=1^+$. We evaluate the decay widths of these states, named as $R_{cc}(3970)$ and $S_{cc}(4100)$ (with strangeness), and obtain $44$ MeV for the non-strangeness, and $24$ MeV for the doubly charm-strange state. Essentially, the decay modes are $DD_{(s)}\pi$ and $DD_{(s)}\gamma$, being the $D\pi$ and $D\gamma$ emitted by one of the $D^*$ meson which forms the molecule.
|
1805.01441
|
Alexandre Kisselev
|
S.C. \.Inan, A.V. Kisselev
|
Search for the RS model with a small curvature through photon-induced
process at the LHC
|
22 pages, 8 figures; 11 equations and 8 references are added
|
Eur. Phys. J. C (2018) 78: 729
|
10.1140/epjc/s10052-018-6210-5
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, potential of the LHC to explore the phenomenology of the
Randall-Sundrum-like scenario with the small curvature for the process $pp \to
p \gamma \gamma p \to p \mu^- \mu^+p $ through the subprocess $\gamma \gamma
\to \mu^- \mu^+$ is examined for two forward detector acceptances, $0.0015 <
\xi< 0.5$ and $0.1< \xi <0.5$. This process is known to be one of the most
clean channels. The sensitivity bounds on the anomalous model parameters have
been found at the $95\%$ confidence level for various LHC integrated luminosity
values.
|
[
{
"created": "Thu, 3 May 2018 17:34:07 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2018 09:24:48 GMT",
"version": "v2"
}
] |
2018-09-26
|
[
[
"İnan",
"S. C.",
""
],
[
"Kisselev",
"A. V.",
""
]
] |
In this paper, potential of the LHC to explore the phenomenology of the Randall-Sundrum-like scenario with the small curvature for the process $pp \to p \gamma \gamma p \to p \mu^- \mu^+p $ through the subprocess $\gamma \gamma \to \mu^- \mu^+$ is examined for two forward detector acceptances, $0.0015 < \xi< 0.5$ and $0.1< \xi <0.5$. This process is known to be one of the most clean channels. The sensitivity bounds on the anomalous model parameters have been found at the $95\%$ confidence level for various LHC integrated luminosity values.
|
hep-ph/9405313
|
Uri Sarid
|
Riccardo Rattazzi, Uri Sarid and Lawrence J. Hall
|
Yukawa Unification: The Good, The Bad and The Ugly
|
(talk Uri Sarid at the Second IFT Workshop on Yukawa Couplings and
the Origins of Mass, 11-13 February 1994, Gainesville, Florida), 18 pages
plus 3 uuencoded figures (included at bottom), REVISED: small typos have been
fixed and some clarifications and a few forgotten acknowledgments and
references have been added. straight LATeX, SU-ITP-94/15
| null | null | null |
hep-ph
| null |
We analyze some consequences of grand unification of the third-generation
Yukawa couplings, in the context of the minimal supersymmetric standard model.
We address two issues: the prediction of the top quark mass, and the generation
of the top-bottom mass hierarchy through a hierarchy of Higgs vacuum
expectation values. The top mass is strongly dependent on a certain ratio of
superpartner masses. And the VEV hierarchy always entails some tuning of the
GUT-scale parameters. We study the RG equations and their semi-analytic
solutions, which exhibit several interesting features, such as a focusing
effect in the limit of certain symmetries and a correlation between the $A$
terms (which contribute to $b\rightarrow s\gamma$) and the gaugino masses. This
study shows that non-universal soft-SUSY-breaking masses are favored (in
particular for splitting the Higgs doublets via D-terms and for allowing more
natural scenarios of symmetry breaking), and hints at features desired in
Yukawa-unified models. Several phenomenological implications are also revealed.
|
[
{
"created": "Wed, 18 May 1994 07:09:32 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 1994 07:37:36 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Rattazzi",
"Riccardo",
""
],
[
"Sarid",
"Uri",
""
],
[
"Hall",
"Lawrence J.",
""
]
] |
We analyze some consequences of grand unification of the third-generation Yukawa couplings, in the context of the minimal supersymmetric standard model. We address two issues: the prediction of the top quark mass, and the generation of the top-bottom mass hierarchy through a hierarchy of Higgs vacuum expectation values. The top mass is strongly dependent on a certain ratio of superpartner masses. And the VEV hierarchy always entails some tuning of the GUT-scale parameters. We study the RG equations and their semi-analytic solutions, which exhibit several interesting features, such as a focusing effect in the limit of certain symmetries and a correlation between the $A$ terms (which contribute to $b\rightarrow s\gamma$) and the gaugino masses. This study shows that non-universal soft-SUSY-breaking masses are favored (in particular for splitting the Higgs doublets via D-terms and for allowing more natural scenarios of symmetry breaking), and hints at features desired in Yukawa-unified models. Several phenomenological implications are also revealed.
|
2106.06990
|
Margarete Muhlleitner
|
Thi Nhung Dao, Martin Gabelmann, Margarete M\"uhlleitner, Heidi Rzehak
|
Two-Loop ${\cal O}((\alpha_t+\alpha_\lambda+\alpha_\kappa)^2)$
Corrections to the Higgs Boson Masses in the CP-Violating NMSSM
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present our computation of the ${\cal
O}((\alpha_t+\alpha_\lambda+\alpha_\kappa)^2)$ two-loop corrections to the
Higgs boson masses of the CP-violating Next-to-Minimal Supersymmetric Standard
Model (NMSSM) using the Feynman-diagrammatic approach in the gaugeless limit at
vanishing external momentum. We choose a mixed $\overline{\mbox{DR}}$-on-shell
(OS) renormalisation scheme for the Higgs sector and apply both
$\overline{\mbox{DR}}$ and OS renormalisation in the top/stop sector. For the
treatment of the infrared divergences we apply and compare three different
regularisation methods: the introduction of a regulator mass, the application
of a small momentum expansion, and the inclusion of the full momentum
dependence. Our new corrections have been implemented in the Fortran code
NMSSMCALC that computes the Higgs mass spectrum of the CP-conserving and
CP-violating NMSSM as well as the Higgs boson decays including the
state-of-the-art higher-order corrections. Our numerical analysis shows that
the newly computed corrections increase with rising $\lambda$ and $\kappa$,
remaining overall below about 3\% compared to our previously computed ${\cal
O}(\alpha_t(\alpha_t+\alpha_s))$ corrections, in the region compatible with
perturbativity below the GUT scale. The renormalisation scheme and scale
dependence is of typical two-loop order. The impact of the CP-violating phases
in the new corrections is small. We furthermore show that the Goldstone Boson
Catastrophe due to the infrared divergences can be treated in a numerically
efficient way by introducing a regulator mass that approximates the
momentum-dependent results best for squared mass values in the permille range
of the squared renormalisation scale. Our results mark another step forward in
the program of increasing the precision in the NMSSM Higgs boson observables.
|
[
{
"created": "Sun, 13 Jun 2021 13:33:57 GMT",
"version": "v1"
}
] |
2021-06-15
|
[
[
"Dao",
"Thi Nhung",
""
],
[
"Gabelmann",
"Martin",
""
],
[
"Mühlleitner",
"Margarete",
""
],
[
"Rzehak",
"Heidi",
""
]
] |
We present our computation of the ${\cal O}((\alpha_t+\alpha_\lambda+\alpha_\kappa)^2)$ two-loop corrections to the Higgs boson masses of the CP-violating Next-to-Minimal Supersymmetric Standard Model (NMSSM) using the Feynman-diagrammatic approach in the gaugeless limit at vanishing external momentum. We choose a mixed $\overline{\mbox{DR}}$-on-shell (OS) renormalisation scheme for the Higgs sector and apply both $\overline{\mbox{DR}}$ and OS renormalisation in the top/stop sector. For the treatment of the infrared divergences we apply and compare three different regularisation methods: the introduction of a regulator mass, the application of a small momentum expansion, and the inclusion of the full momentum dependence. Our new corrections have been implemented in the Fortran code NMSSMCALC that computes the Higgs mass spectrum of the CP-conserving and CP-violating NMSSM as well as the Higgs boson decays including the state-of-the-art higher-order corrections. Our numerical analysis shows that the newly computed corrections increase with rising $\lambda$ and $\kappa$, remaining overall below about 3\% compared to our previously computed ${\cal O}(\alpha_t(\alpha_t+\alpha_s))$ corrections, in the region compatible with perturbativity below the GUT scale. The renormalisation scheme and scale dependence is of typical two-loop order. The impact of the CP-violating phases in the new corrections is small. We furthermore show that the Goldstone Boson Catastrophe due to the infrared divergences can be treated in a numerically efficient way by introducing a regulator mass that approximates the momentum-dependent results best for squared mass values in the permille range of the squared renormalisation scale. Our results mark another step forward in the program of increasing the precision in the NMSSM Higgs boson observables.
|
1803.03650
|
Yuber F. Perez-Gonzalez
|
M. C. Gonzalez-Garcia, Michele Maltoni, Yuber F. Perez-Gonzalez and
Renata Zukanovich Funchal
|
Neutrino Discovery Limit of Dark Matter Direct Detection Experiments in
the Presence of Non-Standard Interactions
|
21 pages, 4 figures. Matches version published in the JHEP. Corrected
exposure and results for CRESST phase III
|
JHEP07(2018)019
|
10.1007/JHEP07(2018)019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The detection of coherent neutrino-nucleus scattering by the COHERENT
collaboration has set on quantitative grounds the existence of an irreducible
neutrino background in direct detection searches of Weakly Interacting Massive
Dark Matter candidates. This background leads to an ultimate discovery limit
for these experiments: a minimum Dark Matter interaction cross section below
which events produced by the coherent neutrino scattering will mimic the Dark
Matter signal, the so-called \emph{neutrino floor}. In this work we study the
modification of such neutrino floor induced by non-standard neutrino
interactions within their presently allowed values by the global analysis of
oscillation and COHERENT data. By using the full likelihood information of such
global analysis we consistently account for the correlated effects of
non-standard neutrino interactions both in the neutrino propagation in matter
and in its interaction in the detector. We quantify their impact on the
neutrino floor for five future experiments: DARWIN (Xe), ARGO (Ar), Super-CDMS
HV (Ge and Si) and CRESST phase III (CaWO$_4$). Quantitatively, we find that
non-standard neutrino interactions allowed at the $3\sigma$ level can result in
an increase of the neutrino floor of up to a factor $\sim 5$ with respect to
the Standard Model expectations and impact the expected sensitivities of the
ARGO, CRESST phase III and DARWIN experiments.
|
[
{
"created": "Fri, 9 Mar 2018 19:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2018 12:00:38 GMT",
"version": "v2"
}
] |
2018-07-06
|
[
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"Michele",
""
],
[
"Perez-Gonzalez",
"Yuber F.",
""
],
[
"Funchal",
"Renata Zukanovich",
""
]
] |
The detection of coherent neutrino-nucleus scattering by the COHERENT collaboration has set on quantitative grounds the existence of an irreducible neutrino background in direct detection searches of Weakly Interacting Massive Dark Matter candidates. This background leads to an ultimate discovery limit for these experiments: a minimum Dark Matter interaction cross section below which events produced by the coherent neutrino scattering will mimic the Dark Matter signal, the so-called \emph{neutrino floor}. In this work we study the modification of such neutrino floor induced by non-standard neutrino interactions within their presently allowed values by the global analysis of oscillation and COHERENT data. By using the full likelihood information of such global analysis we consistently account for the correlated effects of non-standard neutrino interactions both in the neutrino propagation in matter and in its interaction in the detector. We quantify their impact on the neutrino floor for five future experiments: DARWIN (Xe), ARGO (Ar), Super-CDMS HV (Ge and Si) and CRESST phase III (CaWO$_4$). Quantitatively, we find that non-standard neutrino interactions allowed at the $3\sigma$ level can result in an increase of the neutrino floor of up to a factor $\sim 5$ with respect to the Standard Model expectations and impact the expected sensitivities of the ARGO, CRESST phase III and DARWIN experiments.
|
hep-ph/0009226
|
Bruce Hoeneisen
|
B. Hoeneisen and C. Marin
|
Like-sign dimuon charge asymmetry in the decay of B B-bar pairs
|
9 pages, 3 Postscript figures
| null | null |
Universidad San Francisco de Quito preprint USFQ-3-2000
|
hep-ph
| null |
We discuss the CP-violating dimuon charge asymmetry of events p p-bar ---> B
B-bar X ---> mu mu X in the Standard Model. Our conclusion is that the
asymmetry is larger than previously expected and may reach a few percent for
the (B_d^0, B-bar_d^0) system. The analysis is also extended to the Two Higgs
Doublet Model (Model II).
|
[
{
"created": "Tue, 19 Sep 2000 22:09:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hoeneisen",
"B.",
""
],
[
"Marin",
"C.",
""
]
] |
We discuss the CP-violating dimuon charge asymmetry of events p p-bar ---> B B-bar X ---> mu mu X in the Standard Model. Our conclusion is that the asymmetry is larger than previously expected and may reach a few percent for the (B_d^0, B-bar_d^0) system. The analysis is also extended to the Two Higgs Doublet Model (Model II).
|
1202.2470
|
Vesna Borka Jovanovi\'c
|
V. Borka Jovanovi\'c, D. Borka
|
Mass formulas for single-charm tetraquarks with Fermi-Breit hyperfine
interaction
|
13 pages, 6 tables, 2 figures. Accepted for publication in Rom. J.
Phys
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we present the main results of our investigation of the $cq
\bar{q} \bar{q}$ single-charm scalar tetraquarks and their SU(3)$_\mathrm{F}$
representations: $\bar{15}_S$, $\bar{3}_S$, $6_A$ and $\bar{3}_A$. We use the
Fermi-Breit interaction Hamiltonian with SU(3) flavor symmetry breaking to
determine the masses of the single-charm tetraquarks. We also discuss mass
spectra obtained from meson and baryon mass fits. The mass spectra are very
similar to those obtained with Glozman-Riska hyperfine interaction, and they
indicate that some of the experimentally detected states may have tetraquark
nature.
|
[
{
"created": "Sat, 11 Feb 2012 20:31:42 GMT",
"version": "v1"
}
] |
2012-02-14
|
[
[
"Jovanović",
"V. Borka",
""
],
[
"Borka",
"D.",
""
]
] |
In this paper we present the main results of our investigation of the $cq \bar{q} \bar{q}$ single-charm scalar tetraquarks and their SU(3)$_\mathrm{F}$ representations: $\bar{15}_S$, $\bar{3}_S$, $6_A$ and $\bar{3}_A$. We use the Fermi-Breit interaction Hamiltonian with SU(3) flavor symmetry breaking to determine the masses of the single-charm tetraquarks. We also discuss mass spectra obtained from meson and baryon mass fits. The mass spectra are very similar to those obtained with Glozman-Riska hyperfine interaction, and they indicate that some of the experimentally detected states may have tetraquark nature.
|
hep-ph/0106213
|
Liangsb
|
Chongxing Yue, Qingjun Xu, Guoli Liu
|
Lepton-Flavor Violating Processes $l_{i}\to l_{j}\gamma$ in Topcolor
Assisted Technicolor Models
|
some mistakes corrected and several references added
|
Commun.Theor.Phys.38:461-464,2002
|
10.1088/0253-6102/38/4/461
| null |
hep-ph
| null |
We consider the lepton-flavor violating(LFV) processes $l_{i}\to l_{j}\gamma$
in the framework of topcolor assisted technicolor(TC2) models. We find that the
new gauge boson $Z^{\prime}$ predicted by TC2 models can give significantly
contributions to these processes via the flavor changing couplings. The present
experimental bound on the LFV process $\mu \to e\gamma$ gives severe
constraints on the TC2 models. In the case that the $Z^{\prime}$ mass $M_{Z}$
is consistent with other experimental constraints, we obtain constraints on the
lepton mixing factors $K_{\tau\mu}$ and $K_{\tau e}$. The future LFV
experiments will be probe of the TC2 models.
|
[
{
"created": "Tue, 19 Jun 2001 09:25:52 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Aug 2001 22:59:27 GMT",
"version": "v2"
}
] |
2018-01-17
|
[
[
"Yue",
"Chongxing",
""
],
[
"Xu",
"Qingjun",
""
],
[
"Liu",
"Guoli",
""
]
] |
We consider the lepton-flavor violating(LFV) processes $l_{i}\to l_{j}\gamma$ in the framework of topcolor assisted technicolor(TC2) models. We find that the new gauge boson $Z^{\prime}$ predicted by TC2 models can give significantly contributions to these processes via the flavor changing couplings. The present experimental bound on the LFV process $\mu \to e\gamma$ gives severe constraints on the TC2 models. In the case that the $Z^{\prime}$ mass $M_{Z}$ is consistent with other experimental constraints, we obtain constraints on the lepton mixing factors $K_{\tau\mu}$ and $K_{\tau e}$. The future LFV experiments will be probe of the TC2 models.
|
hep-ph/0004184
|
Arnd Brandenburg
|
W. Bernreuther, A. Brandenburg, Z.G. Si
|
Next-to-leading order QCD corrections to top quark spin correlations at
hadron colliders: the reactions $q{\bar q}\to t{\bar t}(g)$
|
14 pages, 5 figures
|
Phys.Lett. B483 (2000) 99-104
|
10.1016/S0370-2693(00)00583-9
| null |
hep-ph
| null |
Future hadron collider experiments are expected to record large to huge
samples of $t\bar t$ events. The analysis of these data with respect to $t\bar
t$ spin-spin correlations requires precise predictions of the production of
these quark pairs in a general spin configuration. Therefore we have computed,
at next-to-leading order (NLO) in the QCD coupling, the spin density matrices
describing $t\bar t$ production by quark antiquark annihilation, which is the
dominant production process at the Tevatron. Moreover we have computed the
strength of the $t\bar t$ spin correlation at NLO, using various spin
quantization axes.
|
[
{
"created": "Wed, 19 Apr 2000 16:01:29 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bernreuther",
"W.",
""
],
[
"Brandenburg",
"A.",
""
],
[
"Si",
"Z. G.",
""
]
] |
Future hadron collider experiments are expected to record large to huge samples of $t\bar t$ events. The analysis of these data with respect to $t\bar t$ spin-spin correlations requires precise predictions of the production of these quark pairs in a general spin configuration. Therefore we have computed, at next-to-leading order (NLO) in the QCD coupling, the spin density matrices describing $t\bar t$ production by quark antiquark annihilation, which is the dominant production process at the Tevatron. Moreover we have computed the strength of the $t\bar t$ spin correlation at NLO, using various spin quantization axes.
|
1410.5478
|
Ben King
|
B. King
|
Double Compton scattering in a constant crossed field
|
8 pages, 6 figures
|
Phys. Rev. A 91, 033415 (2015)
|
10.1103/PhysRevA.91.033415
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Two-photon emission of an electron in an electromagnetic plane wave of
vanishing frequency is calculated. The unpolarised probability is split into a
two-step process, which is shown to be exactly equal to an integration over
polarised subprocesses, and a one-step process, which is found to be dominant
over the formation length. The assumptions of neglecting spin and simultaneous
emission, commonly used in numerical simulations, are discussed in light of
these results.
|
[
{
"created": "Mon, 20 Oct 2014 21:40:43 GMT",
"version": "v1"
}
] |
2015-09-15
|
[
[
"King",
"B.",
""
]
] |
Two-photon emission of an electron in an electromagnetic plane wave of vanishing frequency is calculated. The unpolarised probability is split into a two-step process, which is shown to be exactly equal to an integration over polarised subprocesses, and a one-step process, which is found to be dominant over the formation length. The assumptions of neglecting spin and simultaneous emission, commonly used in numerical simulations, are discussed in light of these results.
|
1606.04873
|
Yao De-Liang
|
Jambul Gegelia, Ulf-G. Mei{\ss}ner, De-Liang Yao
|
The width of the Roper resonance in baryon chiral perturbation theory
|
11 pages, 3 figures
| null |
10.1016/j.physletb.2016.07.068
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the width of the Roper resonance at next-to-leading order in a
systematic expansion of baryon chiral perturbation theory with pions, nucleons,
and the delta and Roper resonances as dynamical degrees of freedom. Three
unknown low-energy constants contribute up to the given order. One of them can
be fixed by reproducing the empirical value for the width of the Roper decay
into a pion and a nucleon. Assuming that the remaining two couplings of the
Roper interaction take values equal to those of the nucleon, the result for the
width of the Roper decaying into a nucleon and two pions is consistent with the
experimental value.
|
[
{
"created": "Wed, 15 Jun 2016 17:31:05 GMT",
"version": "v1"
}
] |
2016-08-24
|
[
[
"Gegelia",
"Jambul",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Yao",
"De-Liang",
""
]
] |
We calculate the width of the Roper resonance at next-to-leading order in a systematic expansion of baryon chiral perturbation theory with pions, nucleons, and the delta and Roper resonances as dynamical degrees of freedom. Three unknown low-energy constants contribute up to the given order. One of them can be fixed by reproducing the empirical value for the width of the Roper decay into a pion and a nucleon. Assuming that the remaining two couplings of the Roper interaction take values equal to those of the nucleon, the result for the width of the Roper decaying into a nucleon and two pions is consistent with the experimental value.
|
1207.1462
|
Christoph Berger
|
Ch. Berger and L. M. Sehgal
|
Flow of entropy in the evolution of the B^0 anti B^0 system: Upper bound
on CP violation from unidirectionality
|
8 pages, 4 figures. Typos corrected, comment on entropy added. To be
published in Physical Review D
|
Phys.Rev. D86 057901 2012
|
10.1103/PhysRevD.86.057901
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have previously studied the time-dependence of a B anti B meson mixture in
terms of its density matrix. The requirement that the absolute value of the
Stokes vector zeta(t) should evolve monotonically from its initial value
zeta(0)=0 to its final value zeta(infinity)=1 was shown to lead to an upper
bound on the CP violating overlap <B_L|B_S>. In the present note we consider an
entropy variable S as an alternative measure of mixing. We show that exactly
the same upper bound emerges from the requirement that the flow of entropy is
unidirectional (dS/dt<0). We compare the entropic current dS/dt with and
without CP violation and identify certain physical features that appear when
the bound on <B_L|B_S> is violated.
|
[
{
"created": "Thu, 5 Jul 2012 21:00:54 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Aug 2012 08:41:15 GMT",
"version": "v2"
}
] |
2015-08-06
|
[
[
"Berger",
"Ch.",
""
],
[
"Sehgal",
"L. M.",
""
]
] |
We have previously studied the time-dependence of a B anti B meson mixture in terms of its density matrix. The requirement that the absolute value of the Stokes vector zeta(t) should evolve monotonically from its initial value zeta(0)=0 to its final value zeta(infinity)=1 was shown to lead to an upper bound on the CP violating overlap <B_L|B_S>. In the present note we consider an entropy variable S as an alternative measure of mixing. We show that exactly the same upper bound emerges from the requirement that the flow of entropy is unidirectional (dS/dt<0). We compare the entropic current dS/dt with and without CP violation and identify certain physical features that appear when the bound on <B_L|B_S> is violated.
|
1812.08501
|
Clara \'Alvarez Luna
|
C. \'Alvarez-Luna and J. A. R. Cembranos
|
Dark photon searches with atomic transitions
|
16 pages, 3 figures
|
J. High Energ. Phys. (2019) 2019: 110
|
10.1007/JHEP07(2019)110
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter could be made up of dark photons, massive but very light
particles whose interactions with matter resemble those of usual photons but
suppressed by a small mixing parameter. We analyze the main approaches to dark
photon interactions and how they can be applied to direct detection experiments
which test different ranges of masses and mixings. A new experiment based on
counting dark photons from induced atomic transitions in a target material is
proposed. This approach appears to be particularly appropriate for dark photon
detection in the meV mass range, extending the constraints in the mixing
parameter by up to eight orders of magnitude with respect to previous
experiments.
|
[
{
"created": "Thu, 20 Dec 2018 11:49:05 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2019 14:13:25 GMT",
"version": "v2"
}
] |
2019-09-13
|
[
[
"Álvarez-Luna",
"C.",
""
],
[
"Cembranos",
"J. A. R.",
""
]
] |
Dark matter could be made up of dark photons, massive but very light particles whose interactions with matter resemble those of usual photons but suppressed by a small mixing parameter. We analyze the main approaches to dark photon interactions and how they can be applied to direct detection experiments which test different ranges of masses and mixings. A new experiment based on counting dark photons from induced atomic transitions in a target material is proposed. This approach appears to be particularly appropriate for dark photon detection in the meV mass range, extending the constraints in the mixing parameter by up to eight orders of magnitude with respect to previous experiments.
|
1404.5038
|
Huong Do Thi
|
L. T. Hue, D. T. Huong, H. N. Long, H. T. Hung, N. H. Thao
|
Signal of doubly charged Higgs at $e^+e^-$ colliders
|
48 pages, 22 figures, more considerations included, accepted for
publication in PTEP
|
Prog. Theor. Exp. Phys. (2015) 113B05
|
10.1093/ptep/ptv155
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Masses and signals of the production of Doubly charged Higgses(DCH) in the
framework of the supersymmetric reduced minimal 3-3-1 model(SUSYRM331) are
investigated. In the DCH sector, weprove that there always exists a region of
the parameter space where the mass of the lightest DCH is in order of
$\mathcal{O}(100)$ GeV even when all other new particles are very heavy.The
lightest DCH mainly decays to two same-sign leptons while the dominated decay
channels of the heavy DCHs are those decay to heavy particles. We analyze each
production cross section for $e^+e^- \rightarrow H^{++} H^{--}$ as a function
of a few kinematic variables, which are useful to discuss the creation of the
DCHs in the $e^+e^-$ colliders as a signal of new physics beyond the Standard
Model. The numerical study shows that the cross sections for creating the
lightest DCH can reach values of few pbs. The two other DCHs are too heavy,
beyond the observable range of experiments. The lightest DCH may be detected by
the International Linear Collider (ILC) or the Compact LInear Collider (CLIC)
by searching its decay to a same-sign charged lepton pair.
|
[
{
"created": "Sun, 20 Apr 2014 13:32:46 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2015 16:20:39 GMT",
"version": "v2"
}
] |
2015-12-03
|
[
[
"Hue",
"L. T.",
""
],
[
"Huong",
"D. T.",
""
],
[
"Long",
"H. N.",
""
],
[
"Hung",
"H. T.",
""
],
[
"Thao",
"N. H.",
""
]
] |
Masses and signals of the production of Doubly charged Higgses(DCH) in the framework of the supersymmetric reduced minimal 3-3-1 model(SUSYRM331) are investigated. In the DCH sector, weprove that there always exists a region of the parameter space where the mass of the lightest DCH is in order of $\mathcal{O}(100)$ GeV even when all other new particles are very heavy.The lightest DCH mainly decays to two same-sign leptons while the dominated decay channels of the heavy DCHs are those decay to heavy particles. We analyze each production cross section for $e^+e^- \rightarrow H^{++} H^{--}$ as a function of a few kinematic variables, which are useful to discuss the creation of the DCHs in the $e^+e^-$ colliders as a signal of new physics beyond the Standard Model. The numerical study shows that the cross sections for creating the lightest DCH can reach values of few pbs. The two other DCHs are too heavy, beyond the observable range of experiments. The lightest DCH may be detected by the International Linear Collider (ILC) or the Compact LInear Collider (CLIC) by searching its decay to a same-sign charged lepton pair.
|
1605.01209
|
Alfredo Urbano
|
Gian F. Giudice, Matthew McCullough, Alfredo Urbano
|
Hunting for Dark Particles with Gravitational Waves
|
44 pages, 14 figures. Revised version to appear in JCAP
| null |
10.1088/1475-7516/2016/10/001
| null |
hep-ph astro-ph.HE gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LIGO observation of gravitational waves from a binary black hole merger
has begun a new era in fundamental physics. If new dark sector particles, be
they bosons or fermions, can coalesce into exotic compact objects (ECOs) of
astronomical size, then the first evidence for such objects, and their
underlying microphysical description, may arise in gravitational wave
observations. In this work we study how the macroscopic properties of ECOs are
related to their microscopic properties, such as dark particle mass and
couplings. We then demonstrate the smoking gun exotic signatures that would
provide observational evidence for ECOs, and hence new particles, in
terrestrial gravitational wave observatories. Finally, we discuss how
gravitational waves can test a core concept in general relativity: Hawking's
area theorem.
|
[
{
"created": "Wed, 4 May 2016 10:22:37 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2016 08:34:23 GMT",
"version": "v2"
}
] |
2016-10-12
|
[
[
"Giudice",
"Gian F.",
""
],
[
"McCullough",
"Matthew",
""
],
[
"Urbano",
"Alfredo",
""
]
] |
The LIGO observation of gravitational waves from a binary black hole merger has begun a new era in fundamental physics. If new dark sector particles, be they bosons or fermions, can coalesce into exotic compact objects (ECOs) of astronomical size, then the first evidence for such objects, and their underlying microphysical description, may arise in gravitational wave observations. In this work we study how the macroscopic properties of ECOs are related to their microscopic properties, such as dark particle mass and couplings. We then demonstrate the smoking gun exotic signatures that would provide observational evidence for ECOs, and hence new particles, in terrestrial gravitational wave observatories. Finally, we discuss how gravitational waves can test a core concept in general relativity: Hawking's area theorem.
|
1408.4552
|
Dao-Neng Gao
|
Dao-Neng Gao
|
Analysis of $J/\psi(\eta_c)\to \gamma ~+$ invisible decays in the
standard model
|
7 pages, 4 figures. An appendix added, published version
|
Phys. Rev. D 90, 077501 (2014)
|
10.1103/PhysRevD.90.077501
|
USTC-ICTS-14-14
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the experimental study of $J/\psi\to\gamma ~+$ invisible decay
by the CLEO Collaboration, we analyze the process $J/\psi\to \gamma
\nu\bar{\nu}$, as the standard model background for this invisible decay, at
the lowest order. Our investigation shows that Br($J/\psi\to \gamma
\nu\bar{\nu}$) is far below the present experimental upper limit on the
branching ratio of $J/\psi\to\gamma ~+$ invisible, which indicates that some
interesting room for new physics in this channel might be expected. We also
present a similar analysis of the $\eta_c\to \gamma \nu\bar{\nu}$ decay.
|
[
{
"created": "Wed, 20 Aug 2014 07:33:59 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2014 06:12:03 GMT",
"version": "v2"
}
] |
2014-10-08
|
[
[
"Gao",
"Dao-Neng",
""
]
] |
Motivated by the experimental study of $J/\psi\to\gamma ~+$ invisible decay by the CLEO Collaboration, we analyze the process $J/\psi\to \gamma \nu\bar{\nu}$, as the standard model background for this invisible decay, at the lowest order. Our investigation shows that Br($J/\psi\to \gamma \nu\bar{\nu}$) is far below the present experimental upper limit on the branching ratio of $J/\psi\to\gamma ~+$ invisible, which indicates that some interesting room for new physics in this channel might be expected. We also present a similar analysis of the $\eta_c\to \gamma \nu\bar{\nu}$ decay.
|
hep-ph/9410257
|
Phil Ratcliffe
|
Giuliano Preparata and Philip G. Ratcliffe
|
The Pomeron in QCD
|
8 pages (LaTeX, plus 4 postscript figures in a separate file), report
number MITH 94/13 *** Replaced figures file with uuencoded, compressed,
tarred version ***
|
Phys.Lett. B345 (1995) 272-276
|
10.1016/0370-2693(94)01621-I
| null |
hep-ph
| null |
In the framework of Anisotropic Chromodynamics, a non-perturbative
realization of QCD, we develop the Low-Nussinov picture of the Pomeron. In this
approach all the usual problems of low pT perturbative calculations (infrared
divergence) are naturally absent. Thus, we are able to perform an ab initio
calculation of the hadron-hadron total cross section. The result is a cross
section of the same magnitude as indicated experimentally and approximately
energy-independent (with a log^2 s growth). We further discuss the pT
dependence of the hadron-hadron elastic-scattering cross section, which
displays all the experimentally observed features.
|
[
{
"created": "Tue, 11 Oct 1994 10:47:44 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 1994 10:53:22 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Oct 1994 16:32:36 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Preparata",
"Giuliano",
""
],
[
"Ratcliffe",
"Philip G.",
""
]
] |
In the framework of Anisotropic Chromodynamics, a non-perturbative realization of QCD, we develop the Low-Nussinov picture of the Pomeron. In this approach all the usual problems of low pT perturbative calculations (infrared divergence) are naturally absent. Thus, we are able to perform an ab initio calculation of the hadron-hadron total cross section. The result is a cross section of the same magnitude as indicated experimentally and approximately energy-independent (with a log^2 s growth). We further discuss the pT dependence of the hadron-hadron elastic-scattering cross section, which displays all the experimentally observed features.
|
0802.3193
|
Brigitte Hiller
|
Brigitte Hiller, Alexander A. Osipov, Alex H. Blin and Joao da
Providencia
|
Effects of Quark Interactions on Dynamical Chiral Symmetry Breaking by a
Magnetic Field
|
This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/
|
SIGMA 4:024,2008
|
10.3842/SIGMA.2008.024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown how the strong interaction dynamics of a multi-quark Lagrangian
affects the catalysis of dynamical symmetry breaking by a constant magnetic
field in (3+1) dimensions. Attention is drawn to the local minima structure of
the theory.
|
[
{
"created": "Thu, 21 Feb 2008 19:14:40 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Feb 2008 19:48:15 GMT",
"version": "v2"
}
] |
2008-12-19
|
[
[
"Hiller",
"Brigitte",
""
],
[
"Osipov",
"Alexander A.",
""
],
[
"Blin",
"Alex H.",
""
],
[
"da Providencia",
"Joao",
""
]
] |
It is shown how the strong interaction dynamics of a multi-quark Lagrangian affects the catalysis of dynamical symmetry breaking by a constant magnetic field in (3+1) dimensions. Attention is drawn to the local minima structure of the theory.
|
1512.05011
|
Todd Garon
|
Vernon Barger, Lisa L. Everett, and Todd S. Garon
|
Electroweak Naturalness and Deflected Mirage Mediation
|
17 Pages, 7 Figures
|
Phys. Rev. D 93, 075024 (2016)
|
10.1103/PhysRevD.93.075024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the question of electroweak naturalness within the deflected
mirage mediation (DMM) framework for supersymmetry breaking in the minimal
supersymmetric standard model (MSSM). The class of DMM models considered are
nine-parameter theories that fall within the general classification of the
19-parameter phenomenological MSSM (pMSSM). Our results show that these DMM
models have regions of parameter space with very low electroweak fine-tuning,
at levels comparable to the pMSSM. These parameter regions should be probed
extensively in the current LHC run.
|
[
{
"created": "Tue, 15 Dec 2015 23:30:04 GMT",
"version": "v1"
}
] |
2016-04-27
|
[
[
"Barger",
"Vernon",
""
],
[
"Everett",
"Lisa L.",
""
],
[
"Garon",
"Todd S.",
""
]
] |
We investigate the question of electroweak naturalness within the deflected mirage mediation (DMM) framework for supersymmetry breaking in the minimal supersymmetric standard model (MSSM). The class of DMM models considered are nine-parameter theories that fall within the general classification of the 19-parameter phenomenological MSSM (pMSSM). Our results show that these DMM models have regions of parameter space with very low electroweak fine-tuning, at levels comparable to the pMSSM. These parameter regions should be probed extensively in the current LHC run.
|
0705.2610
|
Rudy Gilmore
|
Rudy C. Gilmore
|
Mass Limits on Neutralino Dark Matter
|
11 pages, 3 figures
|
Phys.Rev.D76:043520,2007
|
10.1103/PhysRevD.76.043520
| null |
hep-ph
| null |
We set an upper limit on the mass of a supersymmetric neutralino dark matter
particle using the MicrOMEGAS and DarkSUSY software packages and the most
recent constraints on relic density from combined WMAP and SDSS data. We
explore several different possible scenarios within the MSSM, including
coannihilation with charginos and sfermions and annihilation through a massive
Higgs resonance, using low energy mass inputs. We find that no coannihilation
scenario is consistent with dark matter in observed abundance with a mass
greater than 2.5 TeV for a wino--type particle or 1.8 TeV for a Higgsino--type.
Contrived scenarios involving Higgs resonances with finely--tuned mass
parameters can allow masses as high as 34 TeV. The resulting gamma--ray energy
distribution is not in agreement with the recent multi--TeV gamma ray spectrum
observed by H.E.S.S. originating from the center of the Milky Way. Our results
are relevent only for dark matter densities resulting from a thermal origin.
|
[
{
"created": "Thu, 17 May 2007 22:14:04 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2007 00:55:01 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Gilmore",
"Rudy C.",
""
]
] |
We set an upper limit on the mass of a supersymmetric neutralino dark matter particle using the MicrOMEGAS and DarkSUSY software packages and the most recent constraints on relic density from combined WMAP and SDSS data. We explore several different possible scenarios within the MSSM, including coannihilation with charginos and sfermions and annihilation through a massive Higgs resonance, using low energy mass inputs. We find that no coannihilation scenario is consistent with dark matter in observed abundance with a mass greater than 2.5 TeV for a wino--type particle or 1.8 TeV for a Higgsino--type. Contrived scenarios involving Higgs resonances with finely--tuned mass parameters can allow masses as high as 34 TeV. The resulting gamma--ray energy distribution is not in agreement with the recent multi--TeV gamma ray spectrum observed by H.E.S.S. originating from the center of the Milky Way. Our results are relevent only for dark matter densities resulting from a thermal origin.
|
1503.05078
|
Thomas Steeger
|
Lisa Edelhaeuser, Alexander Knochel and Thomas Steeger
|
Applying EFT to Higgs Pair Production in Universal Extra Dimensions
|
13 pages, 8 figures
| null |
10.1007/JHEP11(2015)062
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate single Higgs and Higgs pair production at the LHC in models of
Universal Extra Dimensions. After calculating the relevant cross sections, we
use the UED model as a testing ground for the Effective Field Theory approach
to physics beyond the Standard Model. We show how the UED contributions to
Higgs production can be matched to a dimension-6 operator. We then discuss the
range of validity of this approach, in particular for Higgs pair production,
and determine the sensitivity to the number of KK modes in the loop.
|
[
{
"created": "Tue, 17 Mar 2015 14:46:30 GMT",
"version": "v1"
}
] |
2015-11-23
|
[
[
"Edelhaeuser",
"Lisa",
""
],
[
"Knochel",
"Alexander",
""
],
[
"Steeger",
"Thomas",
""
]
] |
We investigate single Higgs and Higgs pair production at the LHC in models of Universal Extra Dimensions. After calculating the relevant cross sections, we use the UED model as a testing ground for the Effective Field Theory approach to physics beyond the Standard Model. We show how the UED contributions to Higgs production can be matched to a dimension-6 operator. We then discuss the range of validity of this approach, in particular for Higgs pair production, and determine the sensitivity to the number of KK modes in the loop.
|
2208.13782
|
Andreas Bally
|
Andrei Angelescu, Andreas Bally, Florian Goertz, Sascha Weber
|
SU(6) Gauge-Higgs Grand Unification: Minimal Viable Models and Flavor
|
47 + 12 pages, 5 figures, 2 appendices
| null |
10.1007/JHEP04(2023)012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gauge-Higgs grand unification theories are models of gauge-Higgs unification
that extend the electroweak group into a simple group that includes the color
symmetry. The minimal option is a gauge-Higgs grand unification based on the
SU(6) gauge group, mirroring SU(5) grand unification in 4D while providing a
solution to the hierarchy problem. We explore different minimal and realistic
novel incarnations of SU(6) gauge-Higgs grand unification. We submit the setup
to the various flavor hierarchies observed in nature and, utilizing the power
of the fifth dimension, identify an embedding that provides a compelling model
of quarks and leptons that naturally explains the mass hierarchies and the
CKM/PMNS structure. We perform a detailed study of quark - and lepton - flavor
constraints (which are intimately related due to the GUT nature) together with
an analysis of the Higgs potential which arises at the loop level. Electroweak
precision constraints on the model are discussed and the rich scalar sector is
analyzed. Future flavor constraints from upcoming experiments will provide a
stringent test for this class of models, while a scalar singlet and leptoquark
provide unique targets for current and future collider experiments to probe
this solution to various open questions in nature.
|
[
{
"created": "Mon, 29 Aug 2022 18:00:00 GMT",
"version": "v1"
}
] |
2023-04-19
|
[
[
"Angelescu",
"Andrei",
""
],
[
"Bally",
"Andreas",
""
],
[
"Goertz",
"Florian",
""
],
[
"Weber",
"Sascha",
""
]
] |
Gauge-Higgs grand unification theories are models of gauge-Higgs unification that extend the electroweak group into a simple group that includes the color symmetry. The minimal option is a gauge-Higgs grand unification based on the SU(6) gauge group, mirroring SU(5) grand unification in 4D while providing a solution to the hierarchy problem. We explore different minimal and realistic novel incarnations of SU(6) gauge-Higgs grand unification. We submit the setup to the various flavor hierarchies observed in nature and, utilizing the power of the fifth dimension, identify an embedding that provides a compelling model of quarks and leptons that naturally explains the mass hierarchies and the CKM/PMNS structure. We perform a detailed study of quark - and lepton - flavor constraints (which are intimately related due to the GUT nature) together with an analysis of the Higgs potential which arises at the loop level. Electroweak precision constraints on the model are discussed and the rich scalar sector is analyzed. Future flavor constraints from upcoming experiments will provide a stringent test for this class of models, while a scalar singlet and leptoquark provide unique targets for current and future collider experiments to probe this solution to various open questions in nature.
|
hep-ph/9909241
|
Wolfgang Ochs
|
Wolfgang Ochs (MPI Physik, Munich)
|
Lightest glueball and scalar meson nonet in production and decay
|
3 pages, talk at EPS-HEP '99 Conference, July 15-21, 1999, Tampere,
Finland
| null | null |
MPI-PhT/99-40
|
hep-ph
| null |
Recent results concerning the evidence and classification of the
J^{PC}=0^{++} states, obtained with P. Minkowski, are presented: The isoscalars
f_0(980) and f_0(1500) are classified as members of the 0^{++} nonet, while the
broad state called f_0(400-1200) and the state f_0(1370) are considered as
different components of a single broad resonance, the lowest-lying 0^{++}
glueball. Furthermore, we propose the investigation of glueball production in
the fragmentation region of gluon jets.
|
[
{
"created": "Fri, 3 Sep 1999 10:44:34 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ochs",
"Wolfgang",
"",
"MPI Physik, Munich"
]
] |
Recent results concerning the evidence and classification of the J^{PC}=0^{++} states, obtained with P. Minkowski, are presented: The isoscalars f_0(980) and f_0(1500) are classified as members of the 0^{++} nonet, while the broad state called f_0(400-1200) and the state f_0(1370) are considered as different components of a single broad resonance, the lowest-lying 0^{++} glueball. Furthermore, we propose the investigation of glueball production in the fragmentation region of gluon jets.
|
hep-ph/9906289
|
Werner Vogelsang
|
W. Vogelsang (ITP, SUNY at Stony Brook)
|
Polarized lepton nucleon scattering -- summary of the theory talks on
spin physics at DIS 99
|
10 Pages, LaTeX, 6 figures as eps files
|
Nucl.Phys.Proc.Suppl.79:755-765,1999
|
10.1016/S0920-5632(99)00817-8
|
ITP-SB-99-26
|
hep-ph
| null |
We summarize the theory talks given in Working Group 4 `Polarized Lepton
Nucleon Scattering' at the DIS 99 workshop. The significant progress made over
the last year on many of the interesting topics in `spin physics' is
documented.
|
[
{
"created": "Tue, 8 Jun 1999 15:31:40 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Vogelsang",
"W.",
"",
"ITP, SUNY at Stony Brook"
]
] |
We summarize the theory talks given in Working Group 4 `Polarized Lepton Nucleon Scattering' at the DIS 99 workshop. The significant progress made over the last year on many of the interesting topics in `spin physics' is documented.
|
2309.02293
|
Manuel Donaire
|
M. Donaire
|
Acceleration of a polarized neutron by its weak nuclear self-interaction
|
4-page article + 6-page appendix + 1 figure
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
It is proven that the rotation of the spin of a polarized neutron is
accompanied by a net nuclear force upon it. This force arises from the weak
nuclear self-interaction of its constituent quarks, whose chiral nature induces
the transfer of a net momentum to the fields of Z and W-bosons. This effect is
linear in Fermi's constant. As a result, it is estimated that along the
spin-flip of a polarized neutron its velocity undergoes a variation of the
order of meters per second.
|
[
{
"created": "Tue, 5 Sep 2023 14:56:38 GMT",
"version": "v1"
}
] |
2023-09-06
|
[
[
"Donaire",
"M.",
""
]
] |
It is proven that the rotation of the spin of a polarized neutron is accompanied by a net nuclear force upon it. This force arises from the weak nuclear self-interaction of its constituent quarks, whose chiral nature induces the transfer of a net momentum to the fields of Z and W-bosons. This effect is linear in Fermi's constant. As a result, it is estimated that along the spin-flip of a polarized neutron its velocity undergoes a variation of the order of meters per second.
|
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