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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1011.1146 | Sushant Raut | Aniket Joglekar, Suprabh Prakash, Sushant K. Raut and S. Uma Sankar | Physics Potential of a 2540 Km Baseline Superbeam Experiment | 16 pages, 7 figures and 1 table: Published version | Mod.Phys.Lett.A26:2051-2063,2011 | 10.1142/S0217732311036486 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the physics potential of a neutrino superbeam experiment with a 2540
km baseline. We assume a neutrino beam similar to the NuMI beam in medium
energy configuration. We consider a 100 kton totally active scintillator
detector at a 7 mr off-axis location. We find that such a configuration has
outstanding hierarchy discriminating capability. In conjunction with the data
from the present reactor neutrino experiments, it can determine the neutrino
mass hierarchy at 3 sigma level in less than 5 years, if sin^2(2*theta13) >
0.01, running in the neutrino mode alone. As a stand alone experiment, with a 5
year neutrino run and a 5 year anti-neutrino run, it can determine non-zero
theta13 at 3 sigma level if sin^2(2*theta13) > 7*10^{-3} and hierarchy at 3
sigma level if sin^2(2*theta13) > 8*10^{-3}. This data can also distinguish
deltaCP = pi/2 from the CP conserving values of 0 and pi, for sin^2(2*theta13)
> 0.02.
| [
{
"created": "Thu, 4 Nov 2010 12:46:05 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2011 04:43:57 GMT",
"version": "v2"
}
] | 2011-09-27 | [
[
"Joglekar",
"Aniket",
""
],
[
"Prakash",
"Suprabh",
""
],
[
"Raut",
"Sushant K.",
""
],
[
"Sankar",
"S. Uma",
""
]
] | We study the physics potential of a neutrino superbeam experiment with a 2540 km baseline. We assume a neutrino beam similar to the NuMI beam in medium energy configuration. We consider a 100 kton totally active scintillator detector at a 7 mr off-axis location. We find that such a configuration has outstanding hierarchy discriminating capability. In conjunction with the data from the present reactor neutrino experiments, it can determine the neutrino mass hierarchy at 3 sigma level in less than 5 years, if sin^2(2*theta13) > 0.01, running in the neutrino mode alone. As a stand alone experiment, with a 5 year neutrino run and a 5 year anti-neutrino run, it can determine non-zero theta13 at 3 sigma level if sin^2(2*theta13) > 7*10^{-3} and hierarchy at 3 sigma level if sin^2(2*theta13) > 8*10^{-3}. This data can also distinguish deltaCP = pi/2 from the CP conserving values of 0 and pi, for sin^2(2*theta13) > 0.02. |
1007.3095 | Chaehyun Yu | P. Ko, Chaehyun Yu (KIAS), Jungil Lee (Korea U.) | Inclusive double-quarkonium production at the Large Hadron Collider | 26 pages, 7 figures, 3 tables, version published in JHEP | JHEP 1101:070,2011 | 10.1007/JHEP01(2011)070 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the nonrelativistic QCD (NRQCD) factorization formalism, we
investigate inclusive productions of two spin-triplet S-wave quarkonia
pp->2J/psi+X, 2Upsilon+X, and J/psi+Upsilon+X at the CERN Large Hadron
Collider. The total production rates integrated over the rapidity (y) and
transverse-momentum (p_T) ranges |y|<2.4 and p_T<50 GGeV are predicted to be
sigma[pp->2J/psi+X] = 22 (35) nb, sigma[pp->2Upsilon+X] = 24 (49) pb, and
sigma[pp->J/psi+Upsilon+X] = 7 (13) pb at the center-of-momentum energy sqrt{s}
= 7 (14) TeV. In order to provide predictions that can be useful in both small-
and large-p_T regions, we do not employ the fragmentation approximation and we
include the spin-triplet S-wave color-singlet and color-octet channels for each
quarkonium final state at leading order in the strong coupling. The p_T
distributions of pp->2J/psi+X and 2Upsilon+X in the low-p_T region are
dominated by the color-singlet contributions. At leading order in the strong
coupling, the color-singlet channel is absent for pp->J/psi+Upsilon+X.
Therefore, the process pp->J/psi+Upsilon+X may provide a useful probe to the
color-octet mechanism of NRQCD.
| [
{
"created": "Mon, 19 Jul 2010 09:19:09 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2011 10:23:38 GMT",
"version": "v2"
}
] | 2011-02-18 | [
[
"Ko",
"P.",
"",
"KIAS"
],
[
"Yu",
"Chaehyun",
"",
"KIAS"
],
[
"Lee",
"Jungil",
"",
"Korea U."
]
] | Based on the nonrelativistic QCD (NRQCD) factorization formalism, we investigate inclusive productions of two spin-triplet S-wave quarkonia pp->2J/psi+X, 2Upsilon+X, and J/psi+Upsilon+X at the CERN Large Hadron Collider. The total production rates integrated over the rapidity (y) and transverse-momentum (p_T) ranges |y|<2.4 and p_T<50 GGeV are predicted to be sigma[pp->2J/psi+X] = 22 (35) nb, sigma[pp->2Upsilon+X] = 24 (49) pb, and sigma[pp->J/psi+Upsilon+X] = 7 (13) pb at the center-of-momentum energy sqrt{s} = 7 (14) TeV. In order to provide predictions that can be useful in both small- and large-p_T regions, we do not employ the fragmentation approximation and we include the spin-triplet S-wave color-singlet and color-octet channels for each quarkonium final state at leading order in the strong coupling. The p_T distributions of pp->2J/psi+X and 2Upsilon+X in the low-p_T region are dominated by the color-singlet contributions. At leading order in the strong coupling, the color-singlet channel is absent for pp->J/psi+Upsilon+X. Therefore, the process pp->J/psi+Upsilon+X may provide a useful probe to the color-octet mechanism of NRQCD. |
hep-ph/0003011 | Galina L. Klimchitskaya | M. Bordag, B. Geyer, G. L. Klimchitskaya, and V. M. Mostepanenko | New constraints for non-Newtonian gravity in nanometer range from the
improved precision measurement of the Casimir force | 5 pages, 1 figure | Phys.Rev.D62:011701,2000 | 10.1103/PhysRevD.62.011701 | null | hep-ph | null | We obtain constraints on non-Newtonian gravity following from the improved
precision measurement of the Casimir force by means of atomic force microscope.
The hypothetical force is calculated in experimental configuration (a sphere
above a disk both covered by two metallic layers). The strengthenings of
constraints up to 4 times comparing the previous experiment and up to 560 times
comparing the Casimir force measurements between dielectrics are obtained in
the interaction range 5.9 nm$\leq\lambda\leq 115 $nm. Recent speculations about
the presence of some unexplained attractive force in the considered experiment
are shown to be unjustified.
| [
{
"created": "Wed, 1 Mar 2000 19:33:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bordag",
"M.",
""
],
[
"Geyer",
"B.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] | We obtain constraints on non-Newtonian gravity following from the improved precision measurement of the Casimir force by means of atomic force microscope. The hypothetical force is calculated in experimental configuration (a sphere above a disk both covered by two metallic layers). The strengthenings of constraints up to 4 times comparing the previous experiment and up to 560 times comparing the Casimir force measurements between dielectrics are obtained in the interaction range 5.9 nm$\leq\lambda\leq 115 $nm. Recent speculations about the presence of some unexplained attractive force in the considered experiment are shown to be unjustified. |
hep-ph/0503086 | Andre de Gouvea | Andre de Gouvea | Neutrinos Have Mass - So What? | invited brief review, 15 pages, 1 eps figure, typo corrected,
reference added | Mod.Phys.Lett. A19 (2004) 2799-2813 | 10.1142/S0217732304016032 | null | hep-ph hep-ex | null | In this brief review, I discuss the new physics unveiled by neutrino
oscillation experiments over the past several years, and discuss several
attempts at understanding the mechanism behind neutrino masses and lepton
mixing. It is fair to say that, while significant theoretical progress has been
made, we are yet to construct a coherent picture that naturally explains
non-zero, yet tiny, neutrino masses and the newly revealed, puzzling patterns
of lepton mixing. I discuss what the challenges are, and point to the fact that
more experimental input (from both neutrino and non-neutrino experiments) is
dearly required - and that new data is expected to reveal, in the next several
years, new information. Finally, I draw attention to the fact that neutrinos
may have only just begun to reshape fundamental physics, given the fact that we
are still to explain the LSND anomaly and because the neutrino oscillation
phenomenon is ultimately sensitive to very small new-physics effects.
| [
{
"created": "Wed, 9 Mar 2005 00:34:07 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2005 22:11:18 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"de Gouvea",
"Andre",
""
]
] | In this brief review, I discuss the new physics unveiled by neutrino oscillation experiments over the past several years, and discuss several attempts at understanding the mechanism behind neutrino masses and lepton mixing. It is fair to say that, while significant theoretical progress has been made, we are yet to construct a coherent picture that naturally explains non-zero, yet tiny, neutrino masses and the newly revealed, puzzling patterns of lepton mixing. I discuss what the challenges are, and point to the fact that more experimental input (from both neutrino and non-neutrino experiments) is dearly required - and that new data is expected to reveal, in the next several years, new information. Finally, I draw attention to the fact that neutrinos may have only just begun to reshape fundamental physics, given the fact that we are still to explain the LSND anomaly and because the neutrino oscillation phenomenon is ultimately sensitive to very small new-physics effects. |
1712.00178 | Helen Brooks | Jeppe R. Andersen, Helen M. Brooks, Leif L\"onnblad | Merging High Energy with Soft and Collinear Logarithms using HEJ and
PYTHIA | 31 pages, 7 figures; updated to published version | J. High Energ. Phys. (2018) 2018: 74 | 10.1007/JHEP09(2018)074 | CPT/17/184, IPPP/17/92, LU-TP 17-38, MCnet-17-22, CoEPP-MN-17-22 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method to combine the all-order treatment of the High Energy
Jets exclusive partonic Monte Carlo (HEJ) with the parton shower of Pythia8,
while retaining the logarithmic accuracy of both. This procedure enables the
generation of fully realistic and hadronised events with HEJ. Furthermore, the
combination of the two all-order treatments leads to improvements in the
quality of the description of observables, in particular for regions with
disparate transverse scales.
| [
{
"created": "Fri, 1 Dec 2017 03:53:12 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2018 04:16:12 GMT",
"version": "v2"
}
] | 2018-09-19 | [
[
"Andersen",
"Jeppe R.",
""
],
[
"Brooks",
"Helen M.",
""
],
[
"Lönnblad",
"Leif",
""
]
] | We present a method to combine the all-order treatment of the High Energy Jets exclusive partonic Monte Carlo (HEJ) with the parton shower of Pythia8, while retaining the logarithmic accuracy of both. This procedure enables the generation of fully realistic and hadronised events with HEJ. Furthermore, the combination of the two all-order treatments leads to improvements in the quality of the description of observables, in particular for regions with disparate transverse scales. |
0808.1077 | Jignesh Pandya | J N Pandya, Ajay Kumar Rai and P C Vinodkumar | Bottomonium masses, decay rates and scalar charge radii | Presented at Hadron07 at Laboratori Nazionali di Frascati during 8-13
October, 2007 | FrascatiPhys.Ser.46:1519-1522,2007 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The masses of bottomonium s and p-states, decay constants, leptonic as well
as radiative decay widths are computed in the framework of extended harmonic
confinement model without any additional parameters.
| [
{
"created": "Thu, 7 Aug 2008 17:31:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pandya",
"J N",
""
],
[
"Rai",
"Ajay Kumar",
""
],
[
"Vinodkumar",
"P C",
""
]
] | The masses of bottomonium s and p-states, decay constants, leptonic as well as radiative decay widths are computed in the framework of extended harmonic confinement model without any additional parameters. |
1406.3892 | Xing-Gang Wu | Hai-Bing Fu, Xing-Gang Wu, Hua-Yong Han and Yang Ma | $B\to \rho$ transition form factors within the QCD light-cone sum rules
and the $\rho$-meson leading-twist distribution amplitude | 14 pages, 3 figures and 12 tables. References updated and discussions
improved. To be published in J. Phys. G | J. Phys. G: Nucl. Part. Phys. 42 (2015) 055002 | 10.1088/0954-3899/42/5/055002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD light-cone sum rules (LCSR) provides an effective way for dealing
with the heavy-to-light transition form factors (TFFs), whose non-perturbative
dynamics are parameterized into the light-meson's light-cone distribution
amplitudes (LCDAs) with various twist structures. By taking the chiral
correlator as the starting point, we calculate the LCSRs for the $B\to\rho$
TFFs up to twist-4 accuracy. As for the TFFs at the large recoil region, we
observe that the twist-2 transverse DA $\phi_{2;\rho}^\bot$ provides the
dominant contribution, while the contributions from the remaining twist-3 and
twist-4 terms are $\delta^2$-suppressed. Thus, our present improved LCSRs
provides a good platform for testing the $\phi_{2;\rho}^\bot$ behavior. For the
purpose, we suggest a convenient WH-model for the $\rho$-meson leading-twist
wavefunction, in which the parameter $B_{2;\rho}^\bot\sim a^\bot_2$ dominantly
controls its longitudinal distribution. Typically, its DA $\phi_{2;\rho}^\bot$
is CZ-like as $B_{2;\rho}^\bot\simeq-0.20$, which changes to be asymptotic-like
as $B_{2;\rho}^\bot\simeq0.00$. By varying $B_{2;\rho}^\bot\in[-0.20,0.20]$, we
present a detailed comparison of the LCSR estimation for the $B\to\rho$ TFFs
with those of pQCD and Lattice QCD predictions. Furthermore, by using the
extrapolated TFFs, we estimate the CKM-matrix element $|V_{\rm ub}|$ with the
help of two $B\to\rho$ semi-leptonic decays. The predicted value for $|V_{\rm
ub}|$ increases with the increment of $B_{2;\rho}^\bot$, i.e. we have
$\Vub=(2.91\pm0.19)\times 10^{-3}$ for $B_{2;\rho}^\bot=-0.20$ and
$\Vub=(3.11\pm0.19)\times 10^{-3}$ for $B_{2;\rho}^\bot=0.00$. If using the
BABAR prediction as a criteria, we observe that
$B^{\perp}_{2;\rho}\in[-0.2,0.10]$, which indicates that the $\rho$-meson DA
$\phi_{2;\rho}^\bot$ prefers a single-peak behavior rather than a double-humped
behavior.
| [
{
"created": "Mon, 16 Jun 2014 03:20:48 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jan 2015 02:24:11 GMT",
"version": "v2"
}
] | 2015-02-20 | [
[
"Fu",
"Hai-Bing",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Han",
"Hua-Yong",
""
],
[
"Ma",
"Yang",
""
]
] | The QCD light-cone sum rules (LCSR) provides an effective way for dealing with the heavy-to-light transition form factors (TFFs), whose non-perturbative dynamics are parameterized into the light-meson's light-cone distribution amplitudes (LCDAs) with various twist structures. By taking the chiral correlator as the starting point, we calculate the LCSRs for the $B\to\rho$ TFFs up to twist-4 accuracy. As for the TFFs at the large recoil region, we observe that the twist-2 transverse DA $\phi_{2;\rho}^\bot$ provides the dominant contribution, while the contributions from the remaining twist-3 and twist-4 terms are $\delta^2$-suppressed. Thus, our present improved LCSRs provides a good platform for testing the $\phi_{2;\rho}^\bot$ behavior. For the purpose, we suggest a convenient WH-model for the $\rho$-meson leading-twist wavefunction, in which the parameter $B_{2;\rho}^\bot\sim a^\bot_2$ dominantly controls its longitudinal distribution. Typically, its DA $\phi_{2;\rho}^\bot$ is CZ-like as $B_{2;\rho}^\bot\simeq-0.20$, which changes to be asymptotic-like as $B_{2;\rho}^\bot\simeq0.00$. By varying $B_{2;\rho}^\bot\in[-0.20,0.20]$, we present a detailed comparison of the LCSR estimation for the $B\to\rho$ TFFs with those of pQCD and Lattice QCD predictions. Furthermore, by using the extrapolated TFFs, we estimate the CKM-matrix element $|V_{\rm ub}|$ with the help of two $B\to\rho$ semi-leptonic decays. The predicted value for $|V_{\rm ub}|$ increases with the increment of $B_{2;\rho}^\bot$, i.e. we have $\Vub=(2.91\pm0.19)\times 10^{-3}$ for $B_{2;\rho}^\bot=-0.20$ and $\Vub=(3.11\pm0.19)\times 10^{-3}$ for $B_{2;\rho}^\bot=0.00$. If using the BABAR prediction as a criteria, we observe that $B^{\perp}_{2;\rho}\in[-0.2,0.10]$, which indicates that the $\rho$-meson DA $\phi_{2;\rho}^\bot$ prefers a single-peak behavior rather than a double-humped behavior. |
hep-ph/0408220 | Tomohiro Inagaki | T. Hattori, M. Hayashi, T. Inagaki and Y. Kitadono (Hiroshima
University) | Effective Potential for $\lambda\phi^4$ Theory at Finite Temperature in
$R\otimes S^{D-1}$ and $R\otimes H^{D-1}$ | Revtex4, 10 pages, 11 figures, to appear in QG issue of TSPU Vestnik,
typos added | null | null | HUPD-0404 | hep-ph | null | We calculate the explicit expression of the effective potential in a
$\lambda\phi^4$ theory at finite temperature in a static universe for arbitrary
spacetime dimensions (2\leq D < 5). To study the combined effects of the
temperature and scale factor to the spontaneous symmetry breaking we evaluate
the effective potential at finite temperature in $R\otimes S^{D-1}$ and
$R\otimes H^{D-1}$. The phase structure of a $\lambda\phi^4$ theory is found by
observing the minimum of the effective potential with varying temperature and
scale factor. All the ring diagrams are resummed for $D\gtrsim 4$ to improve
the loop expansion at high temperature. For a conformally coupled and a
minimally coupled scalar field it is shown that temperature and positive
curvature suppress the symmetry breaking, while negative curvature enhances it.
The conformally coupled scalar has larger curvature effects than the minimally
coupled one.
| [
{
"created": "Fri, 20 Aug 2004 00:31:27 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Aug 2004 14:09:00 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Aug 2004 14:58:26 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Hattori",
"T.",
"",
"Hiroshima\n University"
],
[
"Hayashi",
"M.",
"",
"Hiroshima\n University"
],
[
"Inagaki",
"T.",
"",
"Hiroshima\n University"
],
[
"Kitadono",
"Y.",
"",
"Hiroshima\n University"
]
] | We calculate the explicit expression of the effective potential in a $\lambda\phi^4$ theory at finite temperature in a static universe for arbitrary spacetime dimensions (2\leq D < 5). To study the combined effects of the temperature and scale factor to the spontaneous symmetry breaking we evaluate the effective potential at finite temperature in $R\otimes S^{D-1}$ and $R\otimes H^{D-1}$. The phase structure of a $\lambda\phi^4$ theory is found by observing the minimum of the effective potential with varying temperature and scale factor. All the ring diagrams are resummed for $D\gtrsim 4$ to improve the loop expansion at high temperature. For a conformally coupled and a minimally coupled scalar field it is shown that temperature and positive curvature suppress the symmetry breaking, while negative curvature enhances it. The conformally coupled scalar has larger curvature effects than the minimally coupled one. |
1311.6746 | Biswajit Adhikary | Biswajit Adhikary, Ambar Ghosal and Probir Roy | Maximal zero textures of the inverse seesaw with broken $\mu\tau$
symmetry | 20 pages, no figure, published in Indian Journal of Physics (Special
issue commemorating the 125th birth anniversary of C.~V.~Raman) | Indian J Phys (2014) 88, 979-989 | 10.1007/s12648-014-0485-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inverse neutrino seesaw, characterised by only one source of lepton
number violation at an ultralight $O$(keV) scale and observable new phenomena
at TeV energies accessible to the LHC, is considered. Maximal zero textures of
the $3\times 3$ lighter and heavier Dirac mass matrices of neutral leptons,
appearing in the Lagarangian for such an inverse seesaw, are studied within the
framework of $\mu\tau$ symmetry in a specified weak basis. That symmetry
ensures the identity of the positions of maximal zeros of the heavy neutrino
mass matrix and its inverse. It then suffices to study the maximal zeros of the
lighter Dirac mass matrix and those of the inverse of the heavier one since
they come in a product. The observed absence of any unmixed neutrino flavour
and the assumption of no strictly massless physical neutrino state allow only
eight $4$-zero $\times$ $4$-zero, eight $4$-zero $\times$ $6$-zero and eight
$6$-zero $\times$ $4$-zero combinations. The additional requirement of
leptogenesis is shown to eliminate the last sixteen textures. The surviving
eight $4$-zero $\times$ $4$-zero textures are subjected to the most general
explicit $\mu\tau$ symmetry breaking terms in the Lagrangian in order to
accommodate the nonzero value of $\theta_{13}$ in the observed range. A full
diagonalisation is then carried out. On numerical comparison with all extant
and relevant neutrino (antineutrino) data, seven of these eight combination
textures in five neutrino matrix forms are found to be allowed, leading to five
distinct neutrino mass matrices. Two of these permit only a normal (and the
other three only an inverted) mass ordering of the light neutrinos.
| [
{
"created": "Tue, 26 Nov 2013 17:27:28 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2014 06:41:52 GMT",
"version": "v2"
}
] | 2014-08-14 | [
[
"Adhikary",
"Biswajit",
""
],
[
"Ghosal",
"Ambar",
""
],
[
"Roy",
"Probir",
""
]
] | The inverse neutrino seesaw, characterised by only one source of lepton number violation at an ultralight $O$(keV) scale and observable new phenomena at TeV energies accessible to the LHC, is considered. Maximal zero textures of the $3\times 3$ lighter and heavier Dirac mass matrices of neutral leptons, appearing in the Lagarangian for such an inverse seesaw, are studied within the framework of $\mu\tau$ symmetry in a specified weak basis. That symmetry ensures the identity of the positions of maximal zeros of the heavy neutrino mass matrix and its inverse. It then suffices to study the maximal zeros of the lighter Dirac mass matrix and those of the inverse of the heavier one since they come in a product. The observed absence of any unmixed neutrino flavour and the assumption of no strictly massless physical neutrino state allow only eight $4$-zero $\times$ $4$-zero, eight $4$-zero $\times$ $6$-zero and eight $6$-zero $\times$ $4$-zero combinations. The additional requirement of leptogenesis is shown to eliminate the last sixteen textures. The surviving eight $4$-zero $\times$ $4$-zero textures are subjected to the most general explicit $\mu\tau$ symmetry breaking terms in the Lagrangian in order to accommodate the nonzero value of $\theta_{13}$ in the observed range. A full diagonalisation is then carried out. On numerical comparison with all extant and relevant neutrino (antineutrino) data, seven of these eight combination textures in five neutrino matrix forms are found to be allowed, leading to five distinct neutrino mass matrices. Two of these permit only a normal (and the other three only an inverted) mass ordering of the light neutrinos. |
0710.3334 | Jan Kalinowski | S.Y. Choi, J. Kalinowski, H.-U. Martyn, R. Ruckl and H. Spiesberger | Speculations on Isolated Lepton Events at HERA | LaTeX, 6 pages, 2 figures, presented at the XXXI Conference of
Theoretical Physics "Matter to the Deepest", Ustron, Poland, September 5-11,
2007 | ActaPhys.Polon.B38:3415-3420,2007 | null | null | hep-ph | null | Speculations on mechanisms which might be responsible for events with an
isolated high p_T lepton, a hadron jet and missing energy, as observed in the
H1 experiment at HERA, are discussed.
| [
{
"created": "Wed, 17 Oct 2007 15:52:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Choi",
"S. Y.",
""
],
[
"Kalinowski",
"J.",
""
],
[
"Martyn",
"H. -U.",
""
],
[
"Ruckl",
"R.",
""
],
[
"Spiesberger",
"H.",
""
]
] | Speculations on mechanisms which might be responsible for events with an isolated high p_T lepton, a hadron jet and missing energy, as observed in the H1 experiment at HERA, are discussed. |
hep-ph/9910343 | Gavin Salam | V. Antonelli, M. Dasgupta and G.P. Salam | The resummed thrust distribution in DIS | 5 pages; talk presented by V. Antonelli at the UK Phenomenology
Workshop on Collider Physics, September 1999, St. John's College, Durham | J.Phys.G26:658-662,2000 | 10.1088/0954-3899/26/5/323 | Bicocca-FT-99-31 | hep-ph | null | We present preliminary results on the resummation of leading and
next-to-leading logarithms for the thrust distribution in deep inelastic
scattering. Our predictions, expanded to O(alpha_s^2), are compared to
corresponding results from the Monte Carlo programs DISASTER++ and DISENT.
| [
{
"created": "Thu, 14 Oct 1999 16:28:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Antonelli",
"V.",
""
],
[
"Dasgupta",
"M.",
""
],
[
"Salam",
"G. P.",
""
]
] | We present preliminary results on the resummation of leading and next-to-leading logarithms for the thrust distribution in deep inelastic scattering. Our predictions, expanded to O(alpha_s^2), are compared to corresponding results from the Monte Carlo programs DISASTER++ and DISENT. |
hep-ph/9203214 | Andrei Linde | Andrei Linde | Strings, Textures, Inflation and Spectrum Bending | 13 pages | Phys.Lett.B284:215-222,1992 | 10.1016/0370-2693(92)90423-2 | null | hep-ph | null | We discuss relationship between inflation and various models of production of
density inhomogeneities due to strings, global monopoles, textures and other
topological and non-topological defects. Neither of these models leads to a
consistent cosmological theory without the help of inflation. However, each of
these models can be incorporated into inflationary cosmology. We propose a
model of inflationary phase transitions, which, in addition to topological and
non-topological defects, may provide adiabatic density perturbations with a
sharp maximum between the galaxy scale $l_g$ and the horizon scale $l_H$.
| [
{
"created": "Mon, 16 Mar 1992 19:24:58 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Linde",
"Andrei",
""
]
] | We discuss relationship between inflation and various models of production of density inhomogeneities due to strings, global monopoles, textures and other topological and non-topological defects. Neither of these models leads to a consistent cosmological theory without the help of inflation. However, each of these models can be incorporated into inflationary cosmology. We propose a model of inflationary phase transitions, which, in addition to topological and non-topological defects, may provide adiabatic density perturbations with a sharp maximum between the galaxy scale $l_g$ and the horizon scale $l_H$. |
1102.2779 | Jens O. Andersen | Jens O. Andersen, Rashid Khan, and Lars T. Kyllingstad | The chiral phase transition and the role of vacuum fluctuations | 10 pages 5figs | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply optimized perturbation theory to the quark-meson model at finite
temperature T and quark chemical potential mu. The effective potential is
calculated to one loop both in the chiral limit and at the physical point and
used to study the chiral dynamics of two-flavor QCD. The critical temperature
and the order of the phase transition depends heavily on whether or not one
includes the bosonic and fermionic vacuum fluctuations in the effective
potential. A full one-loop calculation in the chiral limit predicts a
first-order transition for all values of mu. At the physical point, one finds a
crossover in the whole $\mu-T$ plane.
| [
{
"created": "Mon, 14 Feb 2011 14:29:22 GMT",
"version": "v1"
}
] | 2011-02-15 | [
[
"Andersen",
"Jens O.",
""
],
[
"Khan",
"Rashid",
""
],
[
"Kyllingstad",
"Lars T.",
""
]
] | We apply optimized perturbation theory to the quark-meson model at finite temperature T and quark chemical potential mu. The effective potential is calculated to one loop both in the chiral limit and at the physical point and used to study the chiral dynamics of two-flavor QCD. The critical temperature and the order of the phase transition depends heavily on whether or not one includes the bosonic and fermionic vacuum fluctuations in the effective potential. A full one-loop calculation in the chiral limit predicts a first-order transition for all values of mu. At the physical point, one finds a crossover in the whole $\mu-T$ plane. |
2302.11758 | Guo-Liang Yu | Guo-Liang Yu, Yan Meng, Zhen-Yu Li, Zhi-Gang Wang and Lu Jie | Strong decay properties of single heavy baryons $\Lambda_{Q}$,
$\Sigma_{Q}$ and $\Omega_{Q}$ | arXiv admin note: substantial text overlap with arXiv:2206.08128 | Int. J. Mod. Phys. A, 38 (2023) 2350082 | 10.1142/S0217751X23500823 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Motivated by recent progresses in experiments in searching for the
$\Omega_{c}$ baryons, we systematically analyze the strong decay behaviors of
single heavy baryons $\Lambda_{Q}$, $\Sigma_{Q}$ and $\Omega_{Q}$. The two-body
strong decay properties of $S$-wave, $P$-wave and some $D$-wave states are
studied with the $^{3}P_{0}$ model. The results support assigning the recently
observed $\Omega_{c}(3185)$ and $\Omega_{c}(3327)$ as the 2S($\frac{3}{2}^{+}$)
and 1D($\frac{3}{2}^{+}$) states, respectively. In addition, the quantum
numbers of many other experimentally observed baryons are also suggested
according to their strong decays. Finally, some baryons which have good
potentials to be observed in experiments are predicted and the possible decay
channels for searching for these predicted states are also suggested.
| [
{
"created": "Thu, 23 Feb 2023 03:14:32 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2023 11:26:52 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Apr 2023 13:15:29 GMT",
"version": "v3"
},
{
"created": "Sun, 16 Apr 2023 11:51:42 GMT",
"version": "v4"
},
{
"created": "Sat, 6 May 2023 12:50:05 GMT",
"version": "v5"
}
] | 2023-08-28 | [
[
"Yu",
"Guo-Liang",
""
],
[
"Meng",
"Yan",
""
],
[
"Li",
"Zhen-Yu",
""
],
[
"Wang",
"Zhi-Gang",
""
],
[
"Jie",
"Lu",
""
]
] | Motivated by recent progresses in experiments in searching for the $\Omega_{c}$ baryons, we systematically analyze the strong decay behaviors of single heavy baryons $\Lambda_{Q}$, $\Sigma_{Q}$ and $\Omega_{Q}$. The two-body strong decay properties of $S$-wave, $P$-wave and some $D$-wave states are studied with the $^{3}P_{0}$ model. The results support assigning the recently observed $\Omega_{c}(3185)$ and $\Omega_{c}(3327)$ as the 2S($\frac{3}{2}^{+}$) and 1D($\frac{3}{2}^{+}$) states, respectively. In addition, the quantum numbers of many other experimentally observed baryons are also suggested according to their strong decays. Finally, some baryons which have good potentials to be observed in experiments are predicted and the possible decay channels for searching for these predicted states are also suggested. |
hep-ph/9611409 | Manuel Drees | Manuel Drees (APCTP, Seoul) | An Introduction to Supersymmetry | Lectures given at Seoul summer symposium on field theory, August
1996; 42 pages, LaTeX with equation.sty and axodraw.sty | null | null | APCTP-96-05, KEK-TH-501 | hep-ph | null | A fairly elementary introduction to supersymmetric field theories in general
and the minimal supersymmetric Standard Model (MSSM) in particular is given.
Topics covered include the cancellation of quadratic divergencies, the
construction of the supersymmetric Lagrangian using superfields, the field
content of the MSSM, electroweak symmetry breaking in the MSSM, mixing between
different superparticles (current eigenstates) to produce mass eigenstates, and
the embedding of the MSSM in so--called minimal supergravity.
| [
{
"created": "Mon, 25 Nov 1996 12:57:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Drees",
"Manuel",
"",
"APCTP, Seoul"
]
] | A fairly elementary introduction to supersymmetric field theories in general and the minimal supersymmetric Standard Model (MSSM) in particular is given. Topics covered include the cancellation of quadratic divergencies, the construction of the supersymmetric Lagrangian using superfields, the field content of the MSSM, electroweak symmetry breaking in the MSSM, mixing between different superparticles (current eigenstates) to produce mass eigenstates, and the embedding of the MSSM in so--called minimal supergravity. |
2402.06406 | Patricia Magalhaes | Patricia C. Magalh\~aes, Tara Nanut Petri\v{c}, and Stefan Schacht | Summary of CKM 2023 Working Group 7: "Mixing and CP violation in the D
system: $x_D$, $y_D$, $|q/p|_D$, $\phi_D$, DCPV in $D$ decays" | Presented at the 12th Workshop on the CKM Unitarity Triangle, 18-22
September 2023, Santiago de Compostela | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We summarize the results of Working Group 7 at the 12th International
Workshop on the CKM Unitarity Triangle (CKM 2023) which took place in Santiago
de Compostela, Spain, 18--22 September 2023.
| [
{
"created": "Fri, 9 Feb 2024 13:45:29 GMT",
"version": "v1"
}
] | 2024-02-12 | [
[
"Magalhães",
"Patricia C.",
""
],
[
"Petrič",
"Tara Nanut",
""
],
[
"Schacht",
"Stefan",
""
]
] | We summarize the results of Working Group 7 at the 12th International Workshop on the CKM Unitarity Triangle (CKM 2023) which took place in Santiago de Compostela, Spain, 18--22 September 2023. |
1601.01837 | Nasuf Sonmez PhD | Nasuf Sonmez | Charged Higgs Pair Production in THDM Through Photon-photon Collisions
at the ILC | 9 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, the charged Higgs pair production is analyzed for the minimal
extension of the standard model called two-higgs-doublet model. The process
$\gamma\gamma\rightarrow H^+H^-$ is calculated at the tree level for the ILC
and the numerical analysis is presented for various parameters. The production
rate of the charged Higgs boson pair as a function of center-of-mass (CM)
energy and the differential cross section as a function of angle between photon
and positive charged Higgs boson is presented. The cross section gets high at
the low charged Higgs mass and low CM energies. The total integrated cross
section of the process is also calculated at a $e^+e^-$-collider by convoluting
the $\gamma\gamma\rightarrow H^+H^-$ subprocess with the photon luminosity of
the backscattered photons. The total integrated cross section peaks around
$\sqrt{s}=650 \;\text{GeV}$ and have a value of $1.4 \;\text{pb}$ for
$m_{H^\pm}=100\;\text{GeV/c}^2$. Charged Higgs detection is very important sign
for the new physics and the results shows the potential of the ILC for the
search of the new physics signals.
| [
{
"created": "Fri, 8 Jan 2016 11:34:20 GMT",
"version": "v1"
}
] | 2016-06-07 | [
[
"Sonmez",
"Nasuf",
""
]
] | In this study, the charged Higgs pair production is analyzed for the minimal extension of the standard model called two-higgs-doublet model. The process $\gamma\gamma\rightarrow H^+H^-$ is calculated at the tree level for the ILC and the numerical analysis is presented for various parameters. The production rate of the charged Higgs boson pair as a function of center-of-mass (CM) energy and the differential cross section as a function of angle between photon and positive charged Higgs boson is presented. The cross section gets high at the low charged Higgs mass and low CM energies. The total integrated cross section of the process is also calculated at a $e^+e^-$-collider by convoluting the $\gamma\gamma\rightarrow H^+H^-$ subprocess with the photon luminosity of the backscattered photons. The total integrated cross section peaks around $\sqrt{s}=650 \;\text{GeV}$ and have a value of $1.4 \;\text{pb}$ for $m_{H^\pm}=100\;\text{GeV/c}^2$. Charged Higgs detection is very important sign for the new physics and the results shows the potential of the ILC for the search of the new physics signals. |
2306.12578 | Rebeca Beltran | Rebeca Beltr\'an, Ricardo Cepedello, Martin Hirsch | Tree-level UV completions for $N_R$SMEFT $d=6$ and $d=7$ operators | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study ultra-violet completions for operators in standard model effective
field theory extended with right-handed neutrinos ($N_R$SMEFT). Using a
diagrammatic method, we generate systematically lists of possible tree-level
completions involving scalars, fermions or vectors for all operators at $d=6$
and $d=7$, which contain at least one right-handed neutrino. We compare our
lists of possible UV models to the ones found for pure SMEFT. We also discuss
how the observation of LNV processes via $N_R$SMEFT operators at the LHC can be
related to Majorana neutrino masses of the standard model neutrinos.
| [
{
"created": "Wed, 21 Jun 2023 21:27:22 GMT",
"version": "v1"
}
] | 2023-06-23 | [
[
"Beltrán",
"Rebeca",
""
],
[
"Cepedello",
"Ricardo",
""
],
[
"Hirsch",
"Martin",
""
]
] | We study ultra-violet completions for operators in standard model effective field theory extended with right-handed neutrinos ($N_R$SMEFT). Using a diagrammatic method, we generate systematically lists of possible tree-level completions involving scalars, fermions or vectors for all operators at $d=6$ and $d=7$, which contain at least one right-handed neutrino. We compare our lists of possible UV models to the ones found for pure SMEFT. We also discuss how the observation of LNV processes via $N_R$SMEFT operators at the LHC can be related to Majorana neutrino masses of the standard model neutrinos. |
hep-ph/0008324 | Tsou Sheung Tsun | S.T. Tsou (Oxford) and H.M. Chan (Rutherford-Appleton Lab) | Fermion transmutation - a renormalization effect in gauge theory | 6 pages, uses ws-p8-50x6-00.cls, invited talk at APPC 2000 Taipei | null | null | null | hep-ph | null | A new category of phenomena is predicted in which fermions of different
flavours can transmute into one another, for example $e \to \mu$ or $e \to
\tau$, as a consequence of the `rotating' mass matrix due to renormalization.
As examples, calculations will be presented for various such processes. Some of
these could be accessible to experiments in the near future.
| [
{
"created": "Wed, 30 Aug 2000 23:04:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tsou",
"S. T.",
"",
"Oxford"
],
[
"Chan",
"H. M.",
"",
"Rutherford-Appleton Lab"
]
] | A new category of phenomena is predicted in which fermions of different flavours can transmute into one another, for example $e \to \mu$ or $e \to \tau$, as a consequence of the `rotating' mass matrix due to renormalization. As examples, calculations will be presented for various such processes. Some of these could be accessible to experiments in the near future. |
2205.04663 | Motohiko Yoshimura | M. Yoshimura | B $-$ L genesis by sliding inflaton | Accepted for publication in JCAP | null | 10.1088/1475-7516/2022/08/080 | null | hep-ph astro-ph.CO gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a new mechanism of lepton (L) number asymmetry generation, hence
offer an explanation of matter-antimatter imbalance when a significant amount
of baryon number is later transformed from this L-number by known electroweak
sphaleron mediated process. The basic theoretical framework is a recently
proposed multiple scalar-tensor gravity that dynamically solves the
cosmological constant problem. The L-asymmetry generation in one of two
proposed scenarios is triggered by dynamical relaxation of scalar inflaton
field towards the zero cosmological constant. CPT violation (C= charge
conjugation, P = parity operation, T= time reversal) in the presence of a
chemical potential gives the necessary time arrow, and lepton number violating
scattering in cosmic thermal medium generates a net cosmological L-number via
resonance formation. Another scenario is L-asymmetry generation from
evaporating primordial black holes. These proposed mechanisms do not require CP
violating phases in physics beyond the standard model: the new required physics
is existence of heavy Majorana leptons of masses $ 10^{15} \sim 10^{17}$ GeV
that realizes the seesaw mechanism. We identify the cosmological epoch of
lepto-genesis in two scenarios, which may give the right amount of observed
baryon to entropy ratio. It might even be possible to experimentally determine
microscopic physics parameter, masses of three heavy Majorana leptons by
observing astrophysical footprints of primordial black hole evaporation at
specified hole masses.
| [
{
"created": "Tue, 10 May 2022 04:25:03 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2022 03:05:10 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Aug 2022 00:59:17 GMT",
"version": "v3"
}
] | 2022-09-07 | [
[
"Yoshimura",
"M.",
""
]
] | We propose a new mechanism of lepton (L) number asymmetry generation, hence offer an explanation of matter-antimatter imbalance when a significant amount of baryon number is later transformed from this L-number by known electroweak sphaleron mediated process. The basic theoretical framework is a recently proposed multiple scalar-tensor gravity that dynamically solves the cosmological constant problem. The L-asymmetry generation in one of two proposed scenarios is triggered by dynamical relaxation of scalar inflaton field towards the zero cosmological constant. CPT violation (C= charge conjugation, P = parity operation, T= time reversal) in the presence of a chemical potential gives the necessary time arrow, and lepton number violating scattering in cosmic thermal medium generates a net cosmological L-number via resonance formation. Another scenario is L-asymmetry generation from evaporating primordial black holes. These proposed mechanisms do not require CP violating phases in physics beyond the standard model: the new required physics is existence of heavy Majorana leptons of masses $ 10^{15} \sim 10^{17}$ GeV that realizes the seesaw mechanism. We identify the cosmological epoch of lepto-genesis in two scenarios, which may give the right amount of observed baryon to entropy ratio. It might even be possible to experimentally determine microscopic physics parameter, masses of three heavy Majorana leptons by observing astrophysical footprints of primordial black hole evaporation at specified hole masses. |
hep-ph/0403182 | Andreas Metz | A. Metz, M. Schlegel | Twist-3 Single-Spin Asymmetries in Semi-Inclusive Deep-Inelastic
Scattering | 9 pages, 2 figures, minor changes, version to appear in EPJA | Eur.Phys.J. A22 (2004) 489-494 | 10.1140/epja/i2004-10050-8 | null | hep-ph hep-ex | null | The single spin asymmetries for a longitudinally polarized lepton beam or a
longitudinally polarized nucleon target in semi-inclusive deep-inelastic
scattering are twist-3 observables. We study these asymmetries in a simple
diquark spectator model of the nucleon. Analogous to the case of transverse
target polarization, non-vanishing asymmetries are generated by gluon exchange
between the struck quark and the target system. It is pointed out that the
coupling of the virtual photon to the diquark is needed in order to preserve
electromagnetic gauge invariance at the twist-3 level. The calculation
indicates that previous analyses of these observables are incomplete.
| [
{
"created": "Tue, 16 Mar 2004 16:07:42 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Sep 2004 10:15:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Metz",
"A.",
""
],
[
"Schlegel",
"M.",
""
]
] | The single spin asymmetries for a longitudinally polarized lepton beam or a longitudinally polarized nucleon target in semi-inclusive deep-inelastic scattering are twist-3 observables. We study these asymmetries in a simple diquark spectator model of the nucleon. Analogous to the case of transverse target polarization, non-vanishing asymmetries are generated by gluon exchange between the struck quark and the target system. It is pointed out that the coupling of the virtual photon to the diquark is needed in order to preserve electromagnetic gauge invariance at the twist-3 level. The calculation indicates that previous analyses of these observables are incomplete. |
hep-ph/0110325 | Krzysztof Golec-Biernat | K. Golec-Biernat, L. Motyka, A. M. Stasto | Diffusion into infra-red and unitarization of the BFKL pomeron | 26 pages, 10 figures, some references corrected | Phys.Rev.D65:074037,2002 | 10.1103/PhysRevD.65.074037 | null | hep-ph | null | The BFKL pomeron in perturbative QCD is plagued by the lack of unitarity and
diffusion into the infra-red region of gluon virtualities. These two problems
are intimately related. We perform numerical studies of the evolution equation
proposed by Balitsky and Kovchegov which unitarizes the BFKL pomeron. We show
how diffusion into the infra-red region is suppressed due to the emergence of a
saturation scale and scaling behaviour. We study universality of this
phenomenon as well as its dependence on subleading corrections to the BFKL
pomeron such as the running coupling and kinematic constraint. These
corrections are very important for phenomenological applications.
| [
{
"created": "Thu, 25 Oct 2001 12:28:19 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Oct 2001 10:14:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Golec-Biernat",
"K.",
""
],
[
"Motyka",
"L.",
""
],
[
"Stasto",
"A. M.",
""
]
] | The BFKL pomeron in perturbative QCD is plagued by the lack of unitarity and diffusion into the infra-red region of gluon virtualities. These two problems are intimately related. We perform numerical studies of the evolution equation proposed by Balitsky and Kovchegov which unitarizes the BFKL pomeron. We show how diffusion into the infra-red region is suppressed due to the emergence of a saturation scale and scaling behaviour. We study universality of this phenomenon as well as its dependence on subleading corrections to the BFKL pomeron such as the running coupling and kinematic constraint. These corrections are very important for phenomenological applications. |
1611.04487 | Dipsikha Debnath | Dipsikha Debnath, James S. Gainer, Can Kilic, Doojin Kim, Konstantin
T. Matchev, Yuan-Pao Yang | Detecting kinematic boundary surfaces in phase space: particle mass
measurements in SUSY-like events | 49 pages, 26 figures, version published in JHEP, added preprint
number | JHEP 1706 (2017) 092 | 10.1007/JHEP06(2017)092 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We critically examine the classic endpoint method for particle mass
determination, focusing on difficult corners of parameter space, where some of
the measurements are not independent, while others are adversely affected by
the experimental resolution. In such scenarios, mass differences can be
measured relatively well, but the overall mass scale remains poorly
constrained. Using the example of the standard SUSY decay chain $\tilde q\to
\tilde\chi^0_2\to \tilde \ell \to \tilde \chi^0_1$, we demonstrate that
sensitivity to the remaining mass scale parameter can be recovered by measuring
the two-dimensional kinematical boundary in the relevant three-dimensional
phase space of invariant masses squared. We develop an algorithm for detecting
this boundary, which uses the geometric properties of the Voronoi tessellation
of the data, and in particular, the relative standard deviation (RSD) of the
volumes of the neighbors for each Voronoi cell in the tessellation. We propose
a new observable, $\bar\Sigma$, which is the average RSD per unit area,
calculated over the hypothesized boundary. We show that the location of the
$\bar\Sigma$ maximum correlates very well with the true values of the new
particle masses. Our approach represents the natural extension of the
one-dimensional kinematic endpoint method to the relevant three dimensions of
invariant mass phase space.
| [
{
"created": "Mon, 14 Nov 2016 17:26:22 GMT",
"version": "v1"
},
{
"created": "Sun, 27 May 2018 20:42:17 GMT",
"version": "v2"
}
] | 2018-05-29 | [
[
"Debnath",
"Dipsikha",
""
],
[
"Gainer",
"James S.",
""
],
[
"Kilic",
"Can",
""
],
[
"Kim",
"Doojin",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Yang",
"Yuan-Pao",
""
]
] | We critically examine the classic endpoint method for particle mass determination, focusing on difficult corners of parameter space, where some of the measurements are not independent, while others are adversely affected by the experimental resolution. In such scenarios, mass differences can be measured relatively well, but the overall mass scale remains poorly constrained. Using the example of the standard SUSY decay chain $\tilde q\to \tilde\chi^0_2\to \tilde \ell \to \tilde \chi^0_1$, we demonstrate that sensitivity to the remaining mass scale parameter can be recovered by measuring the two-dimensional kinematical boundary in the relevant three-dimensional phase space of invariant masses squared. We develop an algorithm for detecting this boundary, which uses the geometric properties of the Voronoi tessellation of the data, and in particular, the relative standard deviation (RSD) of the volumes of the neighbors for each Voronoi cell in the tessellation. We propose a new observable, $\bar\Sigma$, which is the average RSD per unit area, calculated over the hypothesized boundary. We show that the location of the $\bar\Sigma$ maximum correlates very well with the true values of the new particle masses. Our approach represents the natural extension of the one-dimensional kinematic endpoint method to the relevant three dimensions of invariant mass phase space. |
2308.10946 | Antonio Enrique C\'arcamo Hern\'andez | A. E. C\'arcamo Hern\'andez, Diego Restrepo, Ivan Schmidt, \'Oscar
Zapata | Effective interactions for the SM fermion mass hierarchy and their
possible UV realization | Improved version | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We built an extended 2HDM theory with a spontaneously broken $U(1) _{X}$
global symmetry, where the tree level Universal Seesaw Mechanism generates the
mass hierarchy of the Standard Model charged fermions and the Zee-Babu
mechanism produces tiny active neutrino masses. The third family of SM charged
fermions gets tree level masses from Yukawa interactions involving the Higgs
doublets $H_1$ (for the top quark) and $H_2$ (for the bottom quark and tau
lepton). The model under consideration is consistent with SM fermion masses and
mixings, with the muon and electron $g-2$ anomalies and successfully
accommodates the constraints arising from charged lepton flavor violation and
meson oscillations. The proposed model predicts rates for charged lepton flavor
violating decays within the reach of forthcoming experiments.
| [
{
"created": "Mon, 21 Aug 2023 18:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2024 01:28:28 GMT",
"version": "v2"
}
] | 2024-07-11 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Restrepo",
"Diego",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Zapata",
"Óscar",
""
]
] | We built an extended 2HDM theory with a spontaneously broken $U(1) _{X}$ global symmetry, where the tree level Universal Seesaw Mechanism generates the mass hierarchy of the Standard Model charged fermions and the Zee-Babu mechanism produces tiny active neutrino masses. The third family of SM charged fermions gets tree level masses from Yukawa interactions involving the Higgs doublets $H_1$ (for the top quark) and $H_2$ (for the bottom quark and tau lepton). The model under consideration is consistent with SM fermion masses and mixings, with the muon and electron $g-2$ anomalies and successfully accommodates the constraints arising from charged lepton flavor violation and meson oscillations. The proposed model predicts rates for charged lepton flavor violating decays within the reach of forthcoming experiments. |
1607.04921 | Gabriel Abelof | Gabriel Abelof, Radja Boughezal, Xiaohui Liu, Frank Petriello | Single-inclusive jet production in electron-nucleon collisions through
next-to-next-to-leading order in perturbative QCD | 9 pages, 4 figures | Physics Letters B (2016), pp. 52-59 | 10.1016/j.physletb.2016.10.022 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the ${\cal O}(\alpha^2\alpha_s^2)$ perturbative corrections to
inclusive jet production in electron-nucleon collisions. This process is of
particular interest to the physics program of a future Electron Ion Collider
(EIC). We include all relevant partonic processes, including deep-inelastic
scattering contributions, photon-initiated corrections, and parton-parton
scattering terms that first appear at this order. Upon integration over the
final-state hadronic phase space we validate our results for the deep-inelastic
corrections against the known next-to-next-to-leading order (NNLO) structure
functions. Our calculation uses the $N$-jettiness subtraction scheme for
performing higher-order computations, and allows for a completely differential
description of the deep-inelastic scattering process. We describe the
application of this method to inclusive jet production in detail, and present
phenomenological results for the proposed EIC. The NNLO corrections have a
non-trivial dependence on the jet kinematics and arise from an intricate
interplay between all contributing partonic channels.
| [
{
"created": "Sun, 17 Jul 2016 22:44:04 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2016 21:04:51 GMT",
"version": "v2"
}
] | 2016-10-28 | [
[
"Abelof",
"Gabriel",
""
],
[
"Boughezal",
"Radja",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Petriello",
"Frank",
""
]
] | We compute the ${\cal O}(\alpha^2\alpha_s^2)$ perturbative corrections to inclusive jet production in electron-nucleon collisions. This process is of particular interest to the physics program of a future Electron Ion Collider (EIC). We include all relevant partonic processes, including deep-inelastic scattering contributions, photon-initiated corrections, and parton-parton scattering terms that first appear at this order. Upon integration over the final-state hadronic phase space we validate our results for the deep-inelastic corrections against the known next-to-next-to-leading order (NNLO) structure functions. Our calculation uses the $N$-jettiness subtraction scheme for performing higher-order computations, and allows for a completely differential description of the deep-inelastic scattering process. We describe the application of this method to inclusive jet production in detail, and present phenomenological results for the proposed EIC. The NNLO corrections have a non-trivial dependence on the jet kinematics and arise from an intricate interplay between all contributing partonic channels. |
1302.0656 | Josip Trampetic Dr. | Josip Trampetic | Noncommutative geometry in quantum field theory and the cosmogenic
neutrino physics at the extreme energies | 10 pages, 6 figures, Invited talk given at Croatian Academy of
Science Symposium: "Nuclear and Subnuclear Physics", December 13, 2012,
Zagreb, Croatia | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analysis of the covariant theta-exact noncommutative (NC) gauge field theory
(GFT), inspired by high energy cosmic rays experiments, is performed in the
framework of the inelastic neutrino-nucleon scatterings. Next we have have
found neutrino two-point function and shows a closed form decoupled from the
hard ultraviolet (UV) divergent term, from softened ultraviolet/infrared
(UV/IR) mixing term, and from the finite terms as well. For a certain choice of
the noncommutative parameter theta which preserves unitarity, problematic UV
divergent and UV/IR mixing terms vanish. Non-perturbative modifications of the
neutrino dispersion relations are assymptotically independent of the scale of
noncommutativity in both, the low and high energy limits and may allow
superluminal propagation.
| [
{
"created": "Mon, 4 Feb 2013 11:49:40 GMT",
"version": "v1"
}
] | 2013-02-05 | [
[
"Trampetic",
"Josip",
""
]
] | Analysis of the covariant theta-exact noncommutative (NC) gauge field theory (GFT), inspired by high energy cosmic rays experiments, is performed in the framework of the inelastic neutrino-nucleon scatterings. Next we have have found neutrino two-point function and shows a closed form decoupled from the hard ultraviolet (UV) divergent term, from softened ultraviolet/infrared (UV/IR) mixing term, and from the finite terms as well. For a certain choice of the noncommutative parameter theta which preserves unitarity, problematic UV divergent and UV/IR mixing terms vanish. Non-perturbative modifications of the neutrino dispersion relations are assymptotically independent of the scale of noncommutativity in both, the low and high energy limits and may allow superluminal propagation. |
hep-ph/0411118 | Andreas Metz | A. Metz, M. Schlegel | Recent progress in the understanding of single spin asymmetries | 10 pages, contribution to the Festschrift on the occasion of Klaus
Goeke's 60th birthday; references added | Annalen Phys. 13 (2004) 699-708 | 10.1002/andp.200410112 | null | hep-ph hep-ex | null | Over the past years a lot of progress has been made in the understanding of
single spin asymmetries in hard scattering processes. We briefly review this
subject, covering the non-vanishing of time-reversal odd parton distributions,
universality of fragmentation functions, and the discovery of previously
unknown time-reversal odd parton distributions at subleading twist.
Interestingly enough, all these developments were initiated by simple model
calculations.
| [
{
"created": "Mon, 8 Nov 2004 18:08:18 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2004 16:10:10 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Metz",
"A.",
""
],
[
"Schlegel",
"M.",
""
]
] | Over the past years a lot of progress has been made in the understanding of single spin asymmetries in hard scattering processes. We briefly review this subject, covering the non-vanishing of time-reversal odd parton distributions, universality of fragmentation functions, and the discovery of previously unknown time-reversal odd parton distributions at subleading twist. Interestingly enough, all these developments were initiated by simple model calculations. |
1810.00768 | Marcel Krause | Marcel Krause, Margarete Muhlleitner, Michael Spira | 2HDECAY - A program for the Calculation of Electroweak One-Loop
Corrections to Higgs Decays in the Two-Higgs-Doublet Model Including
State-of-the-Art QCD Corrections | 58 pages, 3 figures, added the description of several new
renormalization schemes to match 2HDECAY 1.1.0, added a section about the
parameter conversion routine, added references | null | 10.1016/j.cpc.2019.08.003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the program package 2HDECAY for the calculation of the partial
decay widths and branching ratios of the Higgs bosons of a general
CP-conserving 2-Higgs doublet model (2HDM). The tool includes the full
electroweak one-loop corrections to all two-body on-shell Higgs decays in the
2HDM that are not loop-induced. It combines them with the state-of-the-art QCD
corrections that are already implemented in the program HDECAY. For the
renormalization of the electroweak sector an on-shell scheme is implemented for
most of the renormalization parameters. Exceptions are the
soft-$\mathbb{Z}_2$-breaking squared mass scale $m_{12}^2$, where an
$\overline{\text{MS}}$ condition is applied, as well as the 2HDM mixing angles
$\alpha$ and $\beta$, for which several distinct renormalization schemes are
implemented. The tool 2HDECAY can be used for phenomenological analyses of the
branching ratios of Higgs decays in the 2HDM. Furthermore, the separate output
of the electroweak contributions to the tree-level partial decay widths for
several different renormalization schemes allows for an efficient analysis of
the impact of the electroweak corrections and the remaining theoretical error
due to missing higher-order corrections. The latest version of the program
package 2HDECAY can be downloaded from the URL
https://github.com/marcel-krause/2HDECAY .
| [
{
"created": "Mon, 1 Oct 2018 15:46:32 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2019 14:06:34 GMT",
"version": "v2"
}
] | 2019-08-23 | [
[
"Krause",
"Marcel",
""
],
[
"Muhlleitner",
"Margarete",
""
],
[
"Spira",
"Michael",
""
]
] | We present the program package 2HDECAY for the calculation of the partial decay widths and branching ratios of the Higgs bosons of a general CP-conserving 2-Higgs doublet model (2HDM). The tool includes the full electroweak one-loop corrections to all two-body on-shell Higgs decays in the 2HDM that are not loop-induced. It combines them with the state-of-the-art QCD corrections that are already implemented in the program HDECAY. For the renormalization of the electroweak sector an on-shell scheme is implemented for most of the renormalization parameters. Exceptions are the soft-$\mathbb{Z}_2$-breaking squared mass scale $m_{12}^2$, where an $\overline{\text{MS}}$ condition is applied, as well as the 2HDM mixing angles $\alpha$ and $\beta$, for which several distinct renormalization schemes are implemented. The tool 2HDECAY can be used for phenomenological analyses of the branching ratios of Higgs decays in the 2HDM. Furthermore, the separate output of the electroweak contributions to the tree-level partial decay widths for several different renormalization schemes allows for an efficient analysis of the impact of the electroweak corrections and the remaining theoretical error due to missing higher-order corrections. The latest version of the program package 2HDECAY can be downloaded from the URL https://github.com/marcel-krause/2HDECAY . |
hep-ph/0303016 | Bernd Feucht | B. Feucht, J.H. K\"uhn, S. Moch | Fermionic and Scalar Corrections for the Abelian Form Factor at Two
Loops | Latex, 10 pages, 5 figures. B. Feucht is B. Jantzen in later
publications. (The contents of the paper is unchanged.) | Phys.Lett.B561:111-118,2003 | 10.1016/S0370-2693(03)00410-6 | TTP03-06, DESY 03-021 | hep-ph | null | Two-loop corrections for the form factor in a massive Abelian theory are
evaluated, which result from the insertion of massless fermion or scalar loops
into the massive gauge boson propagator. The result is valid for arbitrary
energies and gauge boson mass. Power-suppressed terms vanish rapidly in the
high energy region where the result is well approximated by a polynomial of
third order in ln(s/M^2). The relative importance of subleading logarithms is
emphasised.
| [
{
"created": "Tue, 4 Mar 2003 10:43:09 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2005 14:19:20 GMT",
"version": "v2"
}
] | 2009-03-16 | [
[
"Feucht",
"B.",
""
],
[
"Kühn",
"J. H.",
""
],
[
"Moch",
"S.",
""
]
] | Two-loop corrections for the form factor in a massive Abelian theory are evaluated, which result from the insertion of massless fermion or scalar loops into the massive gauge boson propagator. The result is valid for arbitrary energies and gauge boson mass. Power-suppressed terms vanish rapidly in the high energy region where the result is well approximated by a polynomial of third order in ln(s/M^2). The relative importance of subleading logarithms is emphasised. |
2011.13902 | Roman Pasechnik | Francisco J. de Anda, Alfredo Aranda, Ant\'onio P. Morais and Roman
Pasechnik | Gauge couplings evolution from the Standard Model, through Pati-Salam
theory, into $E_8$ unification of families and forces | 18 pages, 1 figure and 4 tables | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the potential of ultimate unification of the Standard Model matter
and gauge sectors into a single $E_8$ superfield in ten dimensions via an
intermediate Pati-Salam gauge theory. Through a consistent realisation of a
$\mathbb{T}^6/(\mathbb{Z}_6\times \mathbb{Z}_2)$ orbifolding procedure
accompanied by the Wilson line breaking mechanism and Renormalisation Group
evolution of gauge couplings, we have established several benchmark scenarios
for New Physics that are worth further phenomenological exploration.
| [
{
"created": "Fri, 27 Nov 2020 18:44:03 GMT",
"version": "v1"
}
] | 2020-11-30 | [
[
"de Anda",
"Francisco J.",
""
],
[
"Aranda",
"Alfredo",
""
],
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
]
] | We explore the potential of ultimate unification of the Standard Model matter and gauge sectors into a single $E_8$ superfield in ten dimensions via an intermediate Pati-Salam gauge theory. Through a consistent realisation of a $\mathbb{T}^6/(\mathbb{Z}_6\times \mathbb{Z}_2)$ orbifolding procedure accompanied by the Wilson line breaking mechanism and Renormalisation Group evolution of gauge couplings, we have established several benchmark scenarios for New Physics that are worth further phenomenological exploration. |
hep-ph/9604258 | Mustafa Savci | T.M. Aliev (Institute of Physics, Azerbaijanian Academy of Sciences),
M. Savci (Middle East Technical University) | The Strong g_B(**)BPi Coupling Constant in full QCD | 7 pages,LaTeX formatted | J.Phys.G22:1759-1764,1996 | 10.1088/0954-3899/22/12/006 | METU-PHYS-HEP-96-10 | hep-ph | null | To leading order in alpha_s, the leading and non-leading 1/m_b corrections to
the excited g_B^(**) meson coupling g_B^(**)BPi is calculated in the framework
of QCD spectral moment sum rules in the full theory. Our prediction is in good
agreement=20 with the light-cone QCD sum rule result.
| [
{
"created": "Sun, 7 Apr 1996 14:08:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Aliev",
"T. M.",
"",
"Institute of Physics, Azerbaijanian Academy of Sciences"
],
[
"Savci",
"M.",
"",
"Middle East Technical University"
]
] | To leading order in alpha_s, the leading and non-leading 1/m_b corrections to the excited g_B^(**) meson coupling g_B^(**)BPi is calculated in the framework of QCD spectral moment sum rules in the full theory. Our prediction is in good agreement=20 with the light-cone QCD sum rule result. |
2205.11846 | Zhi-Long Han | Ang Liu, Feng-Lan Shao, Zhi-Long Han, Yi Jin, Honglei Li | Sterile Neutrino Portal Dark Matter in $\nu$THDM | 27 pages, 14 figures | null | 10.1140/epjc/s10052-023-11609-5 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we propose the sterile neutrino portal dark matter in
$\nu$THDM. This model can naturally generate tiny neutrino mass with the
neutrinophilic scalar doublet $\Phi_{\nu}$ and sterile neutrinos $N$ around TeV
scale. Charged under a $Z_2$ symmetry, one Dirac fermion singlet $\chi$ and one
scalar singlet $\phi$ are further introduced in the dark sector. The sterile
neutrinos $N$ are the mediators between the DM and SM. Depending on the
coupling strength, the DM can be either WIMP or FIMP. For the WIMP scenario,
pair annihilation of DM into $NN$ is the key channel to satisfy various bounds,
which could be tested at indirect detection experiments. For the FIMP scenario,
besides the direct production of DM from freeze-in mechanism, contributions
from late decay of NLSP is also important. When sterile neutrinos are heavier
than the dark sector, NLSP is long-lived due to tiny mixing angle between
sterile and light neutrinos. Constrains from free-streaming length, CMB, BBN
and neutrino experiments are considered.
| [
{
"created": "Tue, 24 May 2022 07:12:05 GMT",
"version": "v1"
}
] | 2023-06-07 | [
[
"Liu",
"Ang",
""
],
[
"Shao",
"Feng-Lan",
""
],
[
"Han",
"Zhi-Long",
""
],
[
"Jin",
"Yi",
""
],
[
"Li",
"Honglei",
""
]
] | In this paper, we propose the sterile neutrino portal dark matter in $\nu$THDM. This model can naturally generate tiny neutrino mass with the neutrinophilic scalar doublet $\Phi_{\nu}$ and sterile neutrinos $N$ around TeV scale. Charged under a $Z_2$ symmetry, one Dirac fermion singlet $\chi$ and one scalar singlet $\phi$ are further introduced in the dark sector. The sterile neutrinos $N$ are the mediators between the DM and SM. Depending on the coupling strength, the DM can be either WIMP or FIMP. For the WIMP scenario, pair annihilation of DM into $NN$ is the key channel to satisfy various bounds, which could be tested at indirect detection experiments. For the FIMP scenario, besides the direct production of DM from freeze-in mechanism, contributions from late decay of NLSP is also important. When sterile neutrinos are heavier than the dark sector, NLSP is long-lived due to tiny mixing angle between sterile and light neutrinos. Constrains from free-streaming length, CMB, BBN and neutrino experiments are considered. |
1911.02461 | Jialun Ping | Yue Tan, Jialun Ping | $Y(4626)$ in a chiral constituent quark model | 6 pages, 3 figures | Phys. Rev. D 101, 054010 (2020) | 10.1103/PhysRevD.101.054010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Belle Collaboration reported a new exotic state $Y(4620)$ with mass
at 4625.9 MeV in the positronium annihilation process. Inspired by experiment,
we study the tetraquark system $c\bar{s}s\bar{c}$ with quantum numbers
$J^{P}=1^{-}$ in the framework of chiral constituent quark model with the help
of Gaussian expansion method. Two structures, diquark-antidiquark and
meson-meson, with all possible color and spin configurations are considered.
The result shows that no bound state can be formed. To investigate the possible
resonance states, the real scaling method is employed. Several resonance states
with energies 4354, 4408, 4469, 4497 and 4531 MeV, are proposed. Taking into
account the errors in calculating the $q\bar{q}$ mesons, the system errors in
the calculation of four-quark system are around 60$\sim 100$ MeV. The resonance
with energy 4531 MeV is possible the candidate of the newly found state
$Y(4620)$.
| [
{
"created": "Wed, 6 Nov 2019 16:26:09 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Nov 2019 06:44:31 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Dec 2019 07:33:45 GMT",
"version": "v3"
}
] | 2020-03-18 | [
[
"Tan",
"Yue",
""
],
[
"Ping",
"Jialun",
""
]
] | Recently, Belle Collaboration reported a new exotic state $Y(4620)$ with mass at 4625.9 MeV in the positronium annihilation process. Inspired by experiment, we study the tetraquark system $c\bar{s}s\bar{c}$ with quantum numbers $J^{P}=1^{-}$ in the framework of chiral constituent quark model with the help of Gaussian expansion method. Two structures, diquark-antidiquark and meson-meson, with all possible color and spin configurations are considered. The result shows that no bound state can be formed. To investigate the possible resonance states, the real scaling method is employed. Several resonance states with energies 4354, 4408, 4469, 4497 and 4531 MeV, are proposed. Taking into account the errors in calculating the $q\bar{q}$ mesons, the system errors in the calculation of four-quark system are around 60$\sim 100$ MeV. The resonance with energy 4531 MeV is possible the candidate of the newly found state $Y(4620)$. |
2405.05340 | Michele Maltoni | Saeed Ansarifard, M. C. Gonzalez-Garcia, Michele Maltoni, Joao Paulo
Pinheiro | Solar neutrinos and leptonic spin forces | 22 pages, 5 figures, 1 table. Matches published version | JHEP07(2024)172 | 10.1007/JHEP07(2024)172 | IFT-UAM/CSIC-24-67, YITP-SB-2024-08 | hep-ph astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | We quantify the effects of light spin-zero particles with pseudoscalar
couplings to leptons and scalar couplings to nucleons on the evolution of solar
neutrinos. In this scenario the matter potential sourced by the nucleons in the
Sun's matter gives rise to spin precession of the relativistic neutrino
ensemble. As such the effects in the solar observables are different if
neutrinos are Dirac or Majorana particles. For Dirac neutrinos the spin-flavour
precession results into left-handed neutrino to right-handed neutrino (i.e.,
active-sterile) oscillations, while for Majorana neutrinos it results into
left-handed neutrino to right-handed antineutrino (i.e., active-active)
oscillations. In both cases this leads to distortions in the solar neutrino
spectrum which we use to derive constraints on the allowed values of the
mediator mass and couplings via a global analysis of the solar neutrino data.
In addition for Majorana neutrinos spin-flavour precession results into a
potentially observable flux of solar electron antineutrinos at the Earth which
we quantify and constrain with the existing bounds from Borexino and KamLAND.
| [
{
"created": "Wed, 8 May 2024 18:12:58 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2024 08:37:50 GMT",
"version": "v2"
}
] | 2024-08-07 | [
[
"Ansarifard",
"Saeed",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"Michele",
""
],
[
"Pinheiro",
"Joao Paulo",
""
]
] | We quantify the effects of light spin-zero particles with pseudoscalar couplings to leptons and scalar couplings to nucleons on the evolution of solar neutrinos. In this scenario the matter potential sourced by the nucleons in the Sun's matter gives rise to spin precession of the relativistic neutrino ensemble. As such the effects in the solar observables are different if neutrinos are Dirac or Majorana particles. For Dirac neutrinos the spin-flavour precession results into left-handed neutrino to right-handed neutrino (i.e., active-sterile) oscillations, while for Majorana neutrinos it results into left-handed neutrino to right-handed antineutrino (i.e., active-active) oscillations. In both cases this leads to distortions in the solar neutrino spectrum which we use to derive constraints on the allowed values of the mediator mass and couplings via a global analysis of the solar neutrino data. In addition for Majorana neutrinos spin-flavour precession results into a potentially observable flux of solar electron antineutrinos at the Earth which we quantify and constrain with the existing bounds from Borexino and KamLAND. |
hep-ph/0106192 | Bernard Pire | E. R. Berger, F. Cano, M. Diehl and B. Pire | Generalized parton distributions in the deuteron | null | Phys.Rev.Lett.87:142302,2001 | 10.1103/PhysRevLett.87.142302 | null | hep-ph nucl-th | null | We introduce generalized quark and gluon distributions in the deuteron, which
can be measured in exclusive processes like deeply virtual Compton scattering
and meson electroproduction. We discuss the basic properties of these
distributions, and point out how they probe the interplay of nucleon and parton
degrees of freedom in the deuteron wave function.
| [
{
"created": "Mon, 18 Jun 2001 09:47:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Berger",
"E. R.",
""
],
[
"Cano",
"F.",
""
],
[
"Diehl",
"M.",
""
],
[
"Pire",
"B.",
""
]
] | We introduce generalized quark and gluon distributions in the deuteron, which can be measured in exclusive processes like deeply virtual Compton scattering and meson electroproduction. We discuss the basic properties of these distributions, and point out how they probe the interplay of nucleon and parton degrees of freedom in the deuteron wave function. |
hep-ph/9410304 | Rainer Jakob | R. Jakob, P. Kroll, M. Raulfs | Meson-Photon Transition Form Factors | 21 pages, REVTEX, 5 figures (appended as uuencoded compressed tar
file) preprint WU-B 94-28, BUGH Wuppertal | J.Phys.G22:45-58,1996 | 10.1088/0954-3899/22/1/004 | null | hep-ph | null | We report results on the $\pi$-$\gamma$ transition form factor obtained
within the hard scattering approach including transverse momentum effects and
Sudakov corrections. The results clearly favor distribution amplitudes close to
the asymptotic form, $\sim x_1x_2$, and disfavor distribution amplitudes which
are strongly concentrated in the end-point regions. This observation is backed
by information on the elastic form factor of the pion and on its valence quark
distribution function. Applications of our approach to the $\eta$-$\gamma$ and
$\eta^\prime$-$\gamma$ transition form factors are discussed as well. Combining
the form factor data with the two-photon decay widths, we determine the $\eta$
and the $\eta^\prime$ decay constants and the $\eta$-$\eta^\prime$ mixing
angle.
| [
{
"created": "Mon, 17 Oct 1994 11:41:16 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 1994 11:10:52 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Jakob",
"R.",
""
],
[
"Kroll",
"P.",
""
],
[
"Raulfs",
"M.",
""
]
] | We report results on the $\pi$-$\gamma$ transition form factor obtained within the hard scattering approach including transverse momentum effects and Sudakov corrections. The results clearly favor distribution amplitudes close to the asymptotic form, $\sim x_1x_2$, and disfavor distribution amplitudes which are strongly concentrated in the end-point regions. This observation is backed by information on the elastic form factor of the pion and on its valence quark distribution function. Applications of our approach to the $\eta$-$\gamma$ and $\eta^\prime$-$\gamma$ transition form factors are discussed as well. Combining the form factor data with the two-photon decay widths, we determine the $\eta$ and the $\eta^\prime$ decay constants and the $\eta$-$\eta^\prime$ mixing angle. |
hep-ph/0302027 | Stuart Raby | Stuart Raby | A Natural Framework for Bi-large Neutrino Mixing | 10 pages, no figures, extended discussion of standard model version
including charged lepton analysis | Phys.Lett. B561 (2003) 119-124 | 10.1016/S0370-2693(03)00421-0 | OHSTPY-HEP-T-03-001 | hep-ph | null | In this letter we present a "natural" framework for obtaining bi-large
neutrino mixing incorporating the FGY neutrino mass matrix ansatz. We show that
an $SU(2) \times U(1)$ family symmetry can provide the desired FGY neutrino
mass ansatz in the MSSM. We also show how to obtain an approximate FGY ansatz
in an SO(10) SUSY GUT. In this context, the same $SU(2) \times U(1)$ family
symmetry also generates the hierarchy of fermion masses as well as ameliorating
SUSY flavor problems.
| [
{
"created": "Tue, 4 Feb 2003 20:32:58 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 2003 03:08:44 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Mar 2003 19:15:38 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Raby",
"Stuart",
""
]
] | In this letter we present a "natural" framework for obtaining bi-large neutrino mixing incorporating the FGY neutrino mass matrix ansatz. We show that an $SU(2) \times U(1)$ family symmetry can provide the desired FGY neutrino mass ansatz in the MSSM. We also show how to obtain an approximate FGY ansatz in an SO(10) SUSY GUT. In this context, the same $SU(2) \times U(1)$ family symmetry also generates the hierarchy of fermion masses as well as ameliorating SUSY flavor problems. |
hep-ph/0503152 | Stefano Moretti Dr | S. Moretti, M.R. Nolten and D.A. Ross (Southampton University) | Weak corrections and high $E_T$ jets at Tevatron | 4 pages, 4 figures, no significant changes from v2, version to appear
in PRD | Phys.Rev.D74:097301,2006 | 10.1103/PhysRevD.74.097301 | SHEP-05-06 | hep-ph | null | We calculate one-loop (purely) Weak (W) corrections of ${\cal
O}(\alpha_{\mathrm{S}}^2\alpha_{\mathrm{W}})$ to the partonic cross section of
two jets at Tevatron and prove that they can be larger than the tree-level
${\cal O}(\alpha_{\mathrm{S}}\alpha_{\mathrm{EW}})$ and ${\cal
O}(\alpha_{\mathrm{EW}}^2)$ Electro-Weak (EW) ones. At high transverse energy
of the jets, all such corrections may lead to detectable effects of, e.g., -10%
or so, with respect to the leading-order (LO) QCD term of ${\cal
O}(\alpha_{\mathrm{S}}^2)$, for the highest value so far probed by Run 2,
depending on the factorisation/renormalisation scale. Besides, they increase
significantly with jet transverse energy. Hence, our results show that EW
corrections may be needed to fit the Standard Model (SM) to present and future
Tevatron jet data.
| [
{
"created": "Wed, 16 Mar 2005 11:39:42 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2006 16:09:16 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Oct 2006 17:02:04 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Moretti",
"S.",
"",
"Southampton University"
],
[
"Nolten",
"M. R.",
"",
"Southampton University"
],
[
"Ross",
"D. A.",
"",
"Southampton University"
]
] | We calculate one-loop (purely) Weak (W) corrections of ${\cal O}(\alpha_{\mathrm{S}}^2\alpha_{\mathrm{W}})$ to the partonic cross section of two jets at Tevatron and prove that they can be larger than the tree-level ${\cal O}(\alpha_{\mathrm{S}}\alpha_{\mathrm{EW}})$ and ${\cal O}(\alpha_{\mathrm{EW}}^2)$ Electro-Weak (EW) ones. At high transverse energy of the jets, all such corrections may lead to detectable effects of, e.g., -10% or so, with respect to the leading-order (LO) QCD term of ${\cal O}(\alpha_{\mathrm{S}}^2)$, for the highest value so far probed by Run 2, depending on the factorisation/renormalisation scale. Besides, they increase significantly with jet transverse energy. Hence, our results show that EW corrections may be needed to fit the Standard Model (SM) to present and future Tevatron jet data. |
1410.4157 | Grigory Ovanesyan | Grigory Ovanesyan | Jet quenching beyond the energy loss approach | 8 pages, 2 figures | null | 10.1142/S2010194515600605 | ACFI-T14-20 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the jet quenching effect in heavy ion collisions, based on
medium-induced splitting functions calculated from Soft Collinear Effective
Theory with Glauber Gluons. Our method is formulated in the language of DGLAP
evolution equations with medium-induced splitting functions. In the small-$x$
soft gluon approximation we analytically solve the evolution equations and find
an intuitive connection to the energy loss approach. For central Pb+Pb
collisions at the LHC we quantify the effect of finite-$x$ corrections for the
nuclear modification factor and compare to data.
| [
{
"created": "Wed, 15 Oct 2014 18:27:38 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Ovanesyan",
"Grigory",
""
]
] | We study the jet quenching effect in heavy ion collisions, based on medium-induced splitting functions calculated from Soft Collinear Effective Theory with Glauber Gluons. Our method is formulated in the language of DGLAP evolution equations with medium-induced splitting functions. In the small-$x$ soft gluon approximation we analytically solve the evolution equations and find an intuitive connection to the energy loss approach. For central Pb+Pb collisions at the LHC we quantify the effect of finite-$x$ corrections for the nuclear modification factor and compare to data. |
1304.1873 | Avdhesh Kumar | Avdhesh Kumar, Jitesh R. Bhatt and Ananta P. Mishra | Fluctuations in Relativistic Causal Hydrodynamics | 22 pages, 12 figures, (some typographical errors are corrected, new
references and figures have been added, accepted for publication in Nuclear
Physics A.) | Nucl. Phys. A, 925, 199 (2014) | 10.1016/j.nuclphysa.2014.02.012 | null | hep-ph nucl-th physics.flu-dyn physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Formalism to calculate the hydrodynamic fluctuations by applying the Onsager
theory to the relativistic Navier-Stokes equation is already known. In this
work, we calculate hydrodynamic-fluctuations within the framework of the second
order hydrodynamics of M\"{u}ller, Israel and Stewart and its generalization to
the third order. We have also calculated the fluctuations for several other
causal hydrodynamical equations. We show that the form for the
Onsager-coefficients and form of the correlation-functions remains same as
those obtained by the relativistic Navier-Stokes equation and it does not
depend on any specific model of hydrodynamics. Further we numerically
investigate evolution of the correlation function using the one dimensional
boost-invariant (Bjorken) flow. We compare the correlation functions obtained
using the causal hydrodynamics with the correlation-function for the
relativistic Navier-Stokes equation. We find that the qualitative behavior of
the correlation-functions remain same for all the models of the causal
hydrodynamics.
| [
{
"created": "Sat, 6 Apr 2013 10:12:56 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2013 06:17:38 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Feb 2014 17:05:15 GMT",
"version": "v3"
}
] | 2014-09-16 | [
[
"Kumar",
"Avdhesh",
""
],
[
"Bhatt",
"Jitesh R.",
""
],
[
"Mishra",
"Ananta P.",
""
]
] | Formalism to calculate the hydrodynamic fluctuations by applying the Onsager theory to the relativistic Navier-Stokes equation is already known. In this work, we calculate hydrodynamic-fluctuations within the framework of the second order hydrodynamics of M\"{u}ller, Israel and Stewart and its generalization to the third order. We have also calculated the fluctuations for several other causal hydrodynamical equations. We show that the form for the Onsager-coefficients and form of the correlation-functions remains same as those obtained by the relativistic Navier-Stokes equation and it does not depend on any specific model of hydrodynamics. Further we numerically investigate evolution of the correlation function using the one dimensional boost-invariant (Bjorken) flow. We compare the correlation functions obtained using the causal hydrodynamics with the correlation-function for the relativistic Navier-Stokes equation. We find that the qualitative behavior of the correlation-functions remain same for all the models of the causal hydrodynamics. |
1009.2450 | Emanuele Re | Emanuele Re | Single-top Wt-channel production matched with parton showers using the
POWHEG method | 23 pages, 9 figures | Eur.Phys.J.C71:1547,2011 | 10.1140/epjc/s10052-011-1547-z | IPPP/10/74, DCPT/10/148 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for the next-to-leading order calculation of single-top
Wt-channel production interfaced to Shower Monte Carlo programs, implemented
according to the POWHEG method. A comparison with MC@NLO is carried out.
Results obtained using the PYTHIA shower are also shown and the effect of
typical cuts is briefly discussed.
| [
{
"created": "Mon, 13 Sep 2010 17:00:38 GMT",
"version": "v1"
}
] | 2011-03-03 | [
[
"Re",
"Emanuele",
""
]
] | We present results for the next-to-leading order calculation of single-top Wt-channel production interfaced to Shower Monte Carlo programs, implemented according to the POWHEG method. A comparison with MC@NLO is carried out. Results obtained using the PYTHIA shower are also shown and the effect of typical cuts is briefly discussed. |
2303.04420 | Sergey Afonin | S.S. Afonin and T.D. Solomko | On incorporation of heavy-quark mass into soft-wall holographic models | 24 pages | International Journal of Modern Physics A38 (2023) 2350122 | 10.1142/S0217751X23501221 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the soft-wall holographic model with the linear dilaton
background. The model leads to a Hydrogen-like meson spectrum which can be
interpreted as the static limit with very large quark masses when the Coulomb
interaction dominates. The mass scale introduced by the linear dilaton is
matched to the quark mass. The resulting model is analyzed for the scalar,
vector and tensor cases. The electromagnetic coupling constants predicted by
the model are decreasing with the radial number in contrast to the soft-wall
model with quadratic dilaton where these couplings represent a universal
constant. The given prediction is qualitatively consistent with the
corresponding experimental data in vector quarkonia. The proposed model can
thus be used as a constituent part of more elaborated holographic models for
heavy quarkonia. A particular example of such a model is put forward.
| [
{
"created": "Wed, 8 Mar 2023 07:45:13 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2023 13:26:04 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Oct 2023 17:39:40 GMT",
"version": "v3"
}
] | 2023-10-20 | [
[
"Afonin",
"S. S.",
""
],
[
"Solomko",
"T. D.",
""
]
] | We consider the soft-wall holographic model with the linear dilaton background. The model leads to a Hydrogen-like meson spectrum which can be interpreted as the static limit with very large quark masses when the Coulomb interaction dominates. The mass scale introduced by the linear dilaton is matched to the quark mass. The resulting model is analyzed for the scalar, vector and tensor cases. The electromagnetic coupling constants predicted by the model are decreasing with the radial number in contrast to the soft-wall model with quadratic dilaton where these couplings represent a universal constant. The given prediction is qualitatively consistent with the corresponding experimental data in vector quarkonia. The proposed model can thus be used as a constituent part of more elaborated holographic models for heavy quarkonia. A particular example of such a model is put forward. |
1702.08073 | Thomas W. Kephart | Bradley L. Rachlin and Thomas W. Kephart | Spontaneous Breaking of Gauge Groups to Discrete Symmetries | 45 pages | null | 10.1007/JHEP08(2017)110 | null | hep-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many models of beyond Standard Model physics connect flavor symmetry with a
discrete group. Having this symmetry arise spontaneously from a gauge theory
maintains compatibility with quantum gravity and can be used to systematically
prevent anomalies. We minimize a number of Higgs potentials that break gauge
groups to discrete symmetries of interest, and examine their scalar mass
spectra.
| [
{
"created": "Sun, 26 Feb 2017 19:59:08 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Rachlin",
"Bradley L.",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | Many models of beyond Standard Model physics connect flavor symmetry with a discrete group. Having this symmetry arise spontaneously from a gauge theory maintains compatibility with quantum gravity and can be used to systematically prevent anomalies. We minimize a number of Higgs potentials that break gauge groups to discrete symmetries of interest, and examine their scalar mass spectra. |
1012.2455 | Andrej Arbuzov | A.B. Arbuzov, E.A. Kuraev, M.K. Volkov | Production of $\omega\pi^0$ pair in electron-positron annihilation | A mistake is corrected, results are updated; 5 pages | Phys.Rev.C83:048201,2011 | 10.1103/PhysRevC.83.048201 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The process of electron-positron annihilation into a pair of $\pi^0$ and
$\omega$ mesons is considered in the framework of the SU(2)$\times$SU(2)
Nambu--Jona-Lasinio model. Contributions of intermediate photons, $\rho(770)$
and $\rho'(1450)$ vector mesons are taken into account. It is shown that the
bulk of the cross section at energies below 2 GeV is provided by the process
with intermediate $\rho'(1450)$ state. The contribution due to single photon
and $\rho(770)$ exchange is in agreement with the vector meson dominance model.
Numerical results are compared with experimental data.
| [
{
"created": "Sat, 11 Dec 2010 13:33:43 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2011 12:15:37 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Volkov",
"M. K.",
""
]
] | The process of electron-positron annihilation into a pair of $\pi^0$ and $\omega$ mesons is considered in the framework of the SU(2)$\times$SU(2) Nambu--Jona-Lasinio model. Contributions of intermediate photons, $\rho(770)$ and $\rho'(1450)$ vector mesons are taken into account. It is shown that the bulk of the cross section at energies below 2 GeV is provided by the process with intermediate $\rho'(1450)$ state. The contribution due to single photon and $\rho(770)$ exchange is in agreement with the vector meson dominance model. Numerical results are compared with experimental data. |
1111.2854 | Pietro Slavich | E. Bagnaschi, G. Degrassi, P. Slavich and A. Vicini | Higgs production via gluon fusion in the POWHEG approach in the SM and
in the MSSM | 27 pages, 36 eps figures; v2: 2 eps figures added, section 3.2
expanded, version published in JHEP | JHEP 1202:088,2012 | 10.1007/JHEP02(2012)088 | RM3-TH/11-5; IFUM-990/FT | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the gluon fusion production cross section of a scalar Higgs boson
at NLO QCD in the SM and in the MSSM. We implement the calculation in the
POWHEG approach, and match the NLO-QCD results with the PYTHIA and HERWIG QCD
parton showers. We discuss a few representative scenarios in the SM and MSSM
parameter spaces, with emphasis on the fermion and squark mass effects on the
Higgs boson distributions.
| [
{
"created": "Fri, 11 Nov 2011 20:45:54 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Feb 2012 15:11:17 GMT",
"version": "v2"
}
] | 2012-03-01 | [
[
"Bagnaschi",
"E.",
""
],
[
"Degrassi",
"G.",
""
],
[
"Slavich",
"P.",
""
],
[
"Vicini",
"A.",
""
]
] | We consider the gluon fusion production cross section of a scalar Higgs boson at NLO QCD in the SM and in the MSSM. We implement the calculation in the POWHEG approach, and match the NLO-QCD results with the PYTHIA and HERWIG QCD parton showers. We discuss a few representative scenarios in the SM and MSSM parameter spaces, with emphasis on the fermion and squark mass effects on the Higgs boson distributions. |
2404.18992 | Ian Pang | Haoxing Du, Claudius Krause, Vinicius Mikuni, Benjamin Nachman, Ian
Pang and David Shih | Unifying Simulation and Inference with Normalizing Flows | 12 pages, 7 figures | null | null | HEPHY-ML-24-01 | hep-ph hep-ex physics.data-an physics.ins-det stat.ML | http://creativecommons.org/licenses/by/4.0/ | There have been many applications of deep neural networks to detector
calibrations and a growing number of studies that propose deep generative
models as automated fast detector simulators. We show that these two tasks can
be unified by using maximum likelihood estimation (MLE) from conditional
generative models for energy regression. Unlike direct regression techniques,
the MLE approach is prior-independent and non-Gaussian resolutions can be
determined from the shape of the likelihood near the maximum. Using an
ATLAS-like calorimeter simulation, we demonstrate this concept in the context
of calorimeter energy calibration.
| [
{
"created": "Mon, 29 Apr 2024 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 9 May 2024 21:41:49 GMT",
"version": "v2"
}
] | 2024-05-13 | [
[
"Du",
"Haoxing",
""
],
[
"Krause",
"Claudius",
""
],
[
"Mikuni",
"Vinicius",
""
],
[
"Nachman",
"Benjamin",
""
],
[
"Pang",
"Ian",
""
],
[
"Shih",
"David",
""
]
] | There have been many applications of deep neural networks to detector calibrations and a growing number of studies that propose deep generative models as automated fast detector simulators. We show that these two tasks can be unified by using maximum likelihood estimation (MLE) from conditional generative models for energy regression. Unlike direct regression techniques, the MLE approach is prior-independent and non-Gaussian resolutions can be determined from the shape of the likelihood near the maximum. Using an ATLAS-like calorimeter simulation, we demonstrate this concept in the context of calorimeter energy calibration. |
0707.3199 | Schoeffel Laurent | Laurent Schoeffel (DAPNIA, Saclay) | Review of diffraction at HERA and Tevatron | 3 pages (2 col.), 6 figures, proceedings of the conference
Photon2007, Paris 9-13 July 2007 | Nucl.Phys.Proc.Suppl.184:81-84,2008 | 10.1016/j.nuclphysbps.2008.09.142 | null | hep-ph | null | We present and discuss the recent results on diffraction from the HERA and
Tevatron experiments.
| [
{
"created": "Sat, 21 Jul 2007 11:04:02 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Schoeffel",
"Laurent",
"",
"DAPNIA, Saclay"
]
] | We present and discuss the recent results on diffraction from the HERA and Tevatron experiments. |
2105.03422 | Wen Yin | Dongok Kim, Younggeun Kim, Yannis K. Semertzidis, Yun Chang Shin, and
Wen Yin | Cosmic Axion Force | 30pages, 8figures | null | 10.1103/PhysRevD.104.095010 | TU-1023 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nambu-Goldstone bosons, or axions, may be ubiquitous. Some of the axions may
have small masses and thus serve as mediators of long-range forces. In this
paper, we study the force mediated by an extremely light axion, $\phi$, between
the visible sector and the dark sector, where dark matter lives. Since nature
does not preserve the CP symmetry, the coupling between dark matter and $\phi$
is generically CP-violating. In this case, the induced force is extremely
long-range and behaves as an effective magnetic field. If the force acts on
electrons or nucleons, the spins of them on Earth precess around a fixed
direction towards the galactic center. This provides an experimental
opportunity for $\phi$ with mass, $m_\phi$, and decay constant, $f_\phi$,
satisfying $m_\phi\lesssim 10^{-25}\,$ eV, $f_\phi\lesssim 10^{14}\,$GeV if the
daily modulation of the effective magnetic field signals in magnetometers is
measured by using the coherent averaging method. The effective magnetic field
induced by an axionic compact object, such as an axion domain wall, is also
discussed.
| [
{
"created": "Fri, 7 May 2021 17:54:25 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Kim",
"Dongok",
""
],
[
"Kim",
"Younggeun",
""
],
[
"Semertzidis",
"Yannis K.",
""
],
[
"Shin",
"Yun Chang",
""
],
[
"Yin",
"Wen",
""
]
] | Nambu-Goldstone bosons, or axions, may be ubiquitous. Some of the axions may have small masses and thus serve as mediators of long-range forces. In this paper, we study the force mediated by an extremely light axion, $\phi$, between the visible sector and the dark sector, where dark matter lives. Since nature does not preserve the CP symmetry, the coupling between dark matter and $\phi$ is generically CP-violating. In this case, the induced force is extremely long-range and behaves as an effective magnetic field. If the force acts on electrons or nucleons, the spins of them on Earth precess around a fixed direction towards the galactic center. This provides an experimental opportunity for $\phi$ with mass, $m_\phi$, and decay constant, $f_\phi$, satisfying $m_\phi\lesssim 10^{-25}\,$ eV, $f_\phi\lesssim 10^{14}\,$GeV if the daily modulation of the effective magnetic field signals in magnetometers is measured by using the coherent averaging method. The effective magnetic field induced by an axionic compact object, such as an axion domain wall, is also discussed. |
hep-ph/0203273 | Osamu Yasuda | Osamu Yasuda | Physics potential and present status of neutrino factories | 10 pages, 4 figures and 1 table, uses sprocl.sty. Talk at 3rd
Workshop on Neutrino Oscillations and Their Origin (NOON 2001), Kashiwa,
Japan, 5-8 Dec 2001 | null | 10.1142/9789812776488_0028 | null | hep-ph | null | I briefly review the recent status of research on physics potential of
neutrino factories with emphasis on measurements of the CP phase.
| [
{
"created": "Fri, 29 Mar 2002 13:12:00 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Yasuda",
"Osamu",
""
]
] | I briefly review the recent status of research on physics potential of neutrino factories with emphasis on measurements of the CP phase. |
2105.11189 | Sven Heinemeyer | S. Heinemeyer, C. Li, F. Lika, G. Moortgat-Pick, S. Paasch | A 96 GeV Higgs Boson in the 2HDMS: $e^+e^-$ collider prospects | 11 pages, 1 figure. Talks presented at the International Workshop on
Future Linear Colliders (LCWS2021), 15-18 March 2021. C21-03-15.1. arXiv
admin note: text overlap with arXiv:2002.06904 | null | null | IFT-UAM/CSIC-21-061, DESY 21-077 | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The CMS collaboration reported a $\sim 3 \, \sigma$ (local) excess at
$96\;$GeV in the search for light Higgs-boson decaying into two photons. This
mass coincides with a $\sim 2 \, \sigma$ (local) excess in the $b\bar b$ final
state at LEP. We show an interpretation of these possible signals as the
lightest Higgs boson in the 2 Higgs Doublet Model with an additional complex
Higgs singlet (2HDMS). The interpretation is in agreement with all experimental
and theoretical constraints. We concentrate on the 2HDMS type II, which
resembles the Higgs and Yukawa structure of the Next-to Minimal Supersymmetric
Standard Model. We discuss the experimental prospects for constraining our
explanation at future $e^+e^-$ colliders, with concrete analyses based on the
ILC prospects.
| [
{
"created": "Mon, 24 May 2021 10:29:50 GMT",
"version": "v1"
}
] | 2021-05-25 | [
[
"Heinemeyer",
"S.",
""
],
[
"Li",
"C.",
""
],
[
"Lika",
"F.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Paasch",
"S.",
""
]
] | The CMS collaboration reported a $\sim 3 \, \sigma$ (local) excess at $96\;$GeV in the search for light Higgs-boson decaying into two photons. This mass coincides with a $\sim 2 \, \sigma$ (local) excess in the $b\bar b$ final state at LEP. We show an interpretation of these possible signals as the lightest Higgs boson in the 2 Higgs Doublet Model with an additional complex Higgs singlet (2HDMS). The interpretation is in agreement with all experimental and theoretical constraints. We concentrate on the 2HDMS type II, which resembles the Higgs and Yukawa structure of the Next-to Minimal Supersymmetric Standard Model. We discuss the experimental prospects for constraining our explanation at future $e^+e^-$ colliders, with concrete analyses based on the ILC prospects. |
2003.11655 | Craig Roberts | Zhu-Fang Cui, Chen Chen, Daniele Binosi, Feliciano De Soto, Craig D.
Roberts, Jose Rodriguez-Quintero, Sebastian M. Schmidt and Jorge Segovia | Nucleon elastic form factors at accessible large spacelike momenta | 14 pages, 9 figures, 1 table | Phys. Rev. D 102, 014043 (2020) | 10.1103/PhysRevD.102.014043 | NJU-INP 017/20 | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Poincar\'e-covariant quark+diquark Faddeev equation is used to compute
nucleon elastic form factors on $0\leq Q^2\leq 18 \,m_N^2$ ($m_N$ is the
nucleon mass) and elucidate their role as probes of emergent hadronic mass in
the Standard Model. The calculations expose features of the form factors that
can be tested in new generation experiments at existing facilities, e.g. a zero
in $G_E^p/G_M^p$; a maximum in $G_E^n/G_M^n$; and a zero in the proton's
$d$-quark Dirac form factor, $F_1^d$. Additionally, examination of the
associated light-front-transverse number and anomalous magnetisation densities
reveals, inter alia: a marked excess of valence $u$-quarks in the neighbourhood
of the proton's centre of transverse momentum; and that the valence $d$-quark
is markedly more active magnetically than either of the valence $u$-quarks. The
calculations and analysis also reveal other aspects of nucleon structure that
could be tested with a high-luminosity accelerator capable of delivering higher
beam energies than are currently available.
| [
{
"created": "Wed, 25 Mar 2020 21:51:14 GMT",
"version": "v1"
}
] | 2020-08-05 | [
[
"Cui",
"Zhu-Fang",
""
],
[
"Chen",
"Chen",
""
],
[
"Binosi",
"Daniele",
""
],
[
"De Soto",
"Feliciano",
""
],
[
"Roberts",
"Craig D.",
""
],
[
"Rodriguez-Quintero",
"Jose",
""
],
[
"Schmidt",
"Sebastian M.",
""
],
[
"Segovia",
"Jorge",
""
]
] | A Poincar\'e-covariant quark+diquark Faddeev equation is used to compute nucleon elastic form factors on $0\leq Q^2\leq 18 \,m_N^2$ ($m_N$ is the nucleon mass) and elucidate their role as probes of emergent hadronic mass in the Standard Model. The calculations expose features of the form factors that can be tested in new generation experiments at existing facilities, e.g. a zero in $G_E^p/G_M^p$; a maximum in $G_E^n/G_M^n$; and a zero in the proton's $d$-quark Dirac form factor, $F_1^d$. Additionally, examination of the associated light-front-transverse number and anomalous magnetisation densities reveals, inter alia: a marked excess of valence $u$-quarks in the neighbourhood of the proton's centre of transverse momentum; and that the valence $d$-quark is markedly more active magnetically than either of the valence $u$-quarks. The calculations and analysis also reveal other aspects of nucleon structure that could be tested with a high-luminosity accelerator capable of delivering higher beam energies than are currently available. |
hep-ph/0611359 | Francis Halzen | M.C. Gonzalez-Garcia and F. Halzen | Gamma Ray Burst Neutrinos Probing Quantum Gravity | 14 pages, 2 figures | JCAP 0702:008,2007 | 10.1088/1475-7516/2007/02/008 | null | hep-ph astro-ph | null | Very high energy, short wavelength, neutrinos may interact with the
space-time foam predicted by theories of quantum gravity. They would propagate
like light through a crystal lattice and be delayed, with the delay depending
on the energy. This will appear to the observer as a violation of Lorenz
invariance. Back of the envelope calculations imply that observations of
neutrinos produced by gamma ray bursts may reach Planck-scale sensitivity. We
revisit the problem considering two essential complications: the imprecise
timing of the neutrinos associated with their poorly understood production
mechanism in the source and the indirect nature of their energy measurement
made by high energy neutrino telescopes.
| [
{
"created": "Tue, 28 Nov 2006 21:37:01 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Halzen",
"F.",
""
]
] | Very high energy, short wavelength, neutrinos may interact with the space-time foam predicted by theories of quantum gravity. They would propagate like light through a crystal lattice and be delayed, with the delay depending on the energy. This will appear to the observer as a violation of Lorenz invariance. Back of the envelope calculations imply that observations of neutrinos produced by gamma ray bursts may reach Planck-scale sensitivity. We revisit the problem considering two essential complications: the imprecise timing of the neutrinos associated with their poorly understood production mechanism in the source and the indirect nature of their energy measurement made by high energy neutrino telescopes. |
2309.00930 | Zhang Liang | Liang Zhang | Tensor Loop Reduction via the Baikov Representation and an Auxiliary
Vector | 28 pages, an ancillary file | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we introduce a simple and efficient approach for the general
reduction of one-loop integrals. Our method employs the introduction of an
auxiliary vector and the identification of the tensor structure as an auxiliary
propagator. This key insight allows us to express a wide range of one-loop
integrals, encompassing both tensor structures and higher poles, in the Baikov
representation. By establishing an integral-by-parts (IBP) relation, we derive
a recursive formula that systematically solves the one-loop reduction problem,
even in the presence of various degenerate cases. Our proposed strategy is
characterized by its simplicity and effectiveness, offering a significant
advancement in the field of one-loop calculations.
| [
{
"created": "Sat, 2 Sep 2023 12:46:49 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2023 11:51:30 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Mar 2024 04:45:20 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Mar 2024 01:46:32 GMT",
"version": "v4"
},
{
"created": "Tue, 30 Apr 2024 12:57:06 GMT",
"version": "v5"
}
] | 2024-05-01 | [
[
"Zhang",
"Liang",
""
]
] | In this paper, we introduce a simple and efficient approach for the general reduction of one-loop integrals. Our method employs the introduction of an auxiliary vector and the identification of the tensor structure as an auxiliary propagator. This key insight allows us to express a wide range of one-loop integrals, encompassing both tensor structures and higher poles, in the Baikov representation. By establishing an integral-by-parts (IBP) relation, we derive a recursive formula that systematically solves the one-loop reduction problem, even in the presence of various degenerate cases. Our proposed strategy is characterized by its simplicity and effectiveness, offering a significant advancement in the field of one-loop calculations. |
2103.11752 | Melek Y{\i}lmaz \c{S}eng\"ul | Melek Yilmaz Sengul | Double electron-positron pair production with two-electron capture in
relativistic heavy-ion collisions | 7 pages, 1 figure | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We calculated the cross section of double electron-positron pair production
with two-electron capture for the collisions of Pb+Pb ions and we did our
calculations at LHC energies. We applied a similar methodology for the
calculation of bound-free electron-positron pair production. We used
perturbation theory and implemented Monte Carlo integration techniques to
calculate the lowest order Feynman diagrams. We also compared our double
electron-positron pair production with two-electron capture cross section
results obtained in the literature. These calculations may help us to learn
more about strong QED.
| [
{
"created": "Mon, 22 Mar 2021 12:10:40 GMT",
"version": "v1"
}
] | 2021-03-23 | [
[
"Sengul",
"Melek Yilmaz",
""
]
] | We calculated the cross section of double electron-positron pair production with two-electron capture for the collisions of Pb+Pb ions and we did our calculations at LHC energies. We applied a similar methodology for the calculation of bound-free electron-positron pair production. We used perturbation theory and implemented Monte Carlo integration techniques to calculate the lowest order Feynman diagrams. We also compared our double electron-positron pair production with two-electron capture cross section results obtained in the literature. These calculations may help us to learn more about strong QED. |
hep-ph/9608459 | Alexey Yu Umnikov | A.Yu. Umnikov (INFN, Perugia, Italy), F.C. Khanna (Edmonton, Canada)
and L.P. Kaptari (JINR, Dubna, Russia) | Deep inelastic scattering on the deuteron in the Bethe-Salpeter
formalism II: Realistic $NN$-interaction | 29 pages of text using revtex, plus 15 Postscript figures | Phys.Rev.C56:1700-1719,1997 | 10.1103/PhysRevC.56.1700 | null | hep-ph | null | We present a systematic study of the leading twist structure functions of the
deuteron, F_2^D, b_{1,2}^D and g_1^D in a fully relativistic approach. Our
study is based on a realistic Bethe-Salpeter amplitude for the deuteron, which
is obtained as a solution to the homogeneous Bethe-Salpeter equation with a
realistic NN kernel. Particular effort is made to connect the structure
functions to the densities of the appropriate charges and currents. This allows
for a systematic comparison between the relativistic and nonrelativistic
calculations, by analysing the same densities in both approaches. Thus, the
sources of the relativistic effects in the structure functions are understood
and clearly distinguished from variations caused by the differences in the
model parameters. We present both the formalism and extensive numerical
calculations for all steps of our analysis. We find that the nonrelativistic
and relativistic calculations are qualitatively very much alike. However, three
main features systematically distinguish a consistent relativistic approach
from the nonrelativistic one: (i) the binding effects are larger, (ii) the
effect of Fermi motion at high $x$ is stronger and (iii) the relativistic
description of the structure functions b_{1,2}^D is fully consistent, unlike
the nonrelativistic approach, which is internally inconsistent and violates the
fundamental sum rules.
| [
{
"created": "Wed, 28 Aug 1996 03:26:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Umnikov",
"A. Yu.",
"",
"INFN, Perugia, Italy"
],
[
"Khanna",
"F. C.",
"",
"Edmonton, Canada"
],
[
"Kaptari",
"L. P.",
"",
"JINR, Dubna, Russia"
]
] | We present a systematic study of the leading twist structure functions of the deuteron, F_2^D, b_{1,2}^D and g_1^D in a fully relativistic approach. Our study is based on a realistic Bethe-Salpeter amplitude for the deuteron, which is obtained as a solution to the homogeneous Bethe-Salpeter equation with a realistic NN kernel. Particular effort is made to connect the structure functions to the densities of the appropriate charges and currents. This allows for a systematic comparison between the relativistic and nonrelativistic calculations, by analysing the same densities in both approaches. Thus, the sources of the relativistic effects in the structure functions are understood and clearly distinguished from variations caused by the differences in the model parameters. We present both the formalism and extensive numerical calculations for all steps of our analysis. We find that the nonrelativistic and relativistic calculations are qualitatively very much alike. However, three main features systematically distinguish a consistent relativistic approach from the nonrelativistic one: (i) the binding effects are larger, (ii) the effect of Fermi motion at high $x$ is stronger and (iii) the relativistic description of the structure functions b_{1,2}^D is fully consistent, unlike the nonrelativistic approach, which is internally inconsistent and violates the fundamental sum rules. |
1002.4557 | Mathieu Rubin | Mathieu Rubin | Non-Global Logarithms in Filtered Jet Algorithms | 47 pages, 25 figures, 1 figure and a few comments added, version
accepted for publication in JHEP | null | 10.1007/JHEP05(2010)005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically and numerically study the effect of perturbative gluons
emission on the "Filtering analysis", which is part of a subjet analysis
procedure proposed two years ago to possibly identify a low-mass Higgs boson
decaying into b\bar{b} at the LHC. This leads us to examine the non-global
structure of the resulting perturbative series in the leading single-log
large-N_c approximation, including all-orders numerical results, simple
analytical approximations to them and comments on the structure of their series
expansion. We then use these results to semi-analytically optimize the
parameters of the Filtering analysis so as to suppress as much as possible the
effect of underlying event and pile-up on the Higgs mass peak reconstruction
while keeping the major part of the perturbative radiation from the b\bar{b}
dipole.
| [
{
"created": "Wed, 24 Feb 2010 16:29:15 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2010 12:32:36 GMT",
"version": "v2"
}
] | 2010-05-11 | [
[
"Rubin",
"Mathieu",
""
]
] | We analytically and numerically study the effect of perturbative gluons emission on the "Filtering analysis", which is part of a subjet analysis procedure proposed two years ago to possibly identify a low-mass Higgs boson decaying into b\bar{b} at the LHC. This leads us to examine the non-global structure of the resulting perturbative series in the leading single-log large-N_c approximation, including all-orders numerical results, simple analytical approximations to them and comments on the structure of their series expansion. We then use these results to semi-analytically optimize the parameters of the Filtering analysis so as to suppress as much as possible the effect of underlying event and pile-up on the Higgs mass peak reconstruction while keeping the major part of the perturbative radiation from the b\bar{b} dipole. |
1009.2751 | Felix Yu | Arvind Rajaraman and Felix Yu | A New Method for Resolving Combinatorial Ambiguities at Hadron Colliders | 17 pages, 3 figures; v2, introduction, discussion, and conclusions
edited for clarity, figures condensed, published version | Phys.Lett.B700:126-132,2011 | 10.1016/j.physletb.2011.04.068 | UCI-TR-2010-19 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new method for resolving combinatorial ambiguities that arise in
multi-particle decay chains at hadron colliders where the assignment of visible
particles to the different decay chains has ambiguities. Our method, based on
selection cuts favoring high transverse momentum and low invariant mass
pairings, is shown to be significantly superior to the more traditional
hemisphere method for a large class of decay chains, producing an increase in
signal retention of up to a factor of 2. This new method can thus greatly
reduce the combinatorial ambiguities of decay chain assignments.
| [
{
"created": "Tue, 14 Sep 2010 20:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2011 19:14:51 GMT",
"version": "v2"
}
] | 2011-05-25 | [
[
"Rajaraman",
"Arvind",
""
],
[
"Yu",
"Felix",
""
]
] | We present a new method for resolving combinatorial ambiguities that arise in multi-particle decay chains at hadron colliders where the assignment of visible particles to the different decay chains has ambiguities. Our method, based on selection cuts favoring high transverse momentum and low invariant mass pairings, is shown to be significantly superior to the more traditional hemisphere method for a large class of decay chains, producing an increase in signal retention of up to a factor of 2. This new method can thus greatly reduce the combinatorial ambiguities of decay chain assignments. |
1004.5398 | A. M. Fedotov | A.M. Fedotov, N.B. Narozhny, G. Mourou, G. Korn | Limitations on the attainable intensity of high power lasers | 4 pages, 3 figures | Phys.Rev.Lett.105:080402,2010 | 10.1103/PhysRevLett.105.080402 | null | hep-ph physics.optics physics.plasm-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that even a single $e^-e^+$ pair created by a super strong laser
field in vacuum would cause development of an avalanche-like QED cascade which
rapidly depletes the incoming laser pulse. This confirms the old N. Bohr
conjecture that the electric field of the critical QED strength
$E_S=m^2c^3/e\hbar$ could never be created.
| [
{
"created": "Thu, 29 Apr 2010 20:43:54 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Fedotov",
"A. M.",
""
],
[
"Narozhny",
"N. B.",
""
],
[
"Mourou",
"G.",
""
],
[
"Korn",
"G.",
""
]
] | It is shown that even a single $e^-e^+$ pair created by a super strong laser field in vacuum would cause development of an avalanche-like QED cascade which rapidly depletes the incoming laser pulse. This confirms the old N. Bohr conjecture that the electric field of the critical QED strength $E_S=m^2c^3/e\hbar$ could never be created. |
hep-ph/9809315 | Robert Foot | R. Foot | Implications of the $\nu_\mu \to \nu_s$ solution to the atmospheric
neutrino anomaly for early Universe cosmology | some references added and expanded discussion | Astropart.Phys.10:253-273,1999 | 10.1016/S0927-6505(98)00051-6 | UM-P-98/44 | hep-ph astro-ph | null | By numerically solving the quantum kinetic equations we compute the range of
parameters where the $\nu_\mu \to \nu_s$ oscillation solution to the
atmospheric neutrino anomaly is consistent with a stringent big bang
nucleosynthesis (BBN) bound of $N_{eff}^{BBN} \stackrel{<}{\sim} 3.6$. We show
that this requires tau neutrino masses in the range $m_{\nu_\tau} \stackrel
{>}{\sim} 4 eV$ (for $|\delta m^2_{atm}| = 10^{-2.5} eV^2$). We discuss the
implications of this scenario for hot+cold dark matter, BBN, and the anisotropy
of the cosmic microwave background.
| [
{
"created": "Thu, 10 Sep 1998 05:47:33 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 1998 03:11:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Foot",
"R.",
""
]
] | By numerically solving the quantum kinetic equations we compute the range of parameters where the $\nu_\mu \to \nu_s$ oscillation solution to the atmospheric neutrino anomaly is consistent with a stringent big bang nucleosynthesis (BBN) bound of $N_{eff}^{BBN} \stackrel{<}{\sim} 3.6$. We show that this requires tau neutrino masses in the range $m_{\nu_\tau} \stackrel {>}{\sim} 4 eV$ (for $|\delta m^2_{atm}| = 10^{-2.5} eV^2$). We discuss the implications of this scenario for hot+cold dark matter, BBN, and the anisotropy of the cosmic microwave background. |
1510.03460 | Nishita Desai | Joseph Bramante, Nishita Desai, Patrick Fox, Adam Martin, Bryan
Ostdiek, Tilman Plehn | Towards the Final Word on Neutralino Dark Matter | 23 pages, 8 figures | Phys. Rev. D 93, 063525 (2016) | 10.1103/PhysRevD.93.063525 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a complete phenomenological prospectus for thermal relic
neutralinos. Including Sommerfeld enhancements to relic abundance and halo
annihilation calculations, we obtain direct, indirect, and collider discovery
prospects for all neutralinos with mass parameters $M_1,M_2,|\mu| < 4$ TeV,
that freeze out to the observed dark matter abundance, with scalar
superpartners decoupled. Much of the relic neutralino sector will be uncovered
by the direct detection experiments Xenon1T and LZ, as well as indirect
detection with CTA. We emphasize that thermal relic higgsinos will be found by
next-generation direct detection experiments, so long as $M_{1,2} < 4$ TeV.
Charged tracks at a 100 TeV hadron collider complement indirect searches for
relic winos. Thermal relic bino-winos still evade all planned experiments,
including disappearing charged-track searches. However, they can be discovered
by compressed electroweakino searches at a 100 TeV collider, completing the
full coverage of the relic neutralino surface.
| [
{
"created": "Mon, 12 Oct 2015 20:55:58 GMT",
"version": "v1"
}
] | 2016-03-30 | [
[
"Bramante",
"Joseph",
""
],
[
"Desai",
"Nishita",
""
],
[
"Fox",
"Patrick",
""
],
[
"Martin",
"Adam",
""
],
[
"Ostdiek",
"Bryan",
""
],
[
"Plehn",
"Tilman",
""
]
] | We present a complete phenomenological prospectus for thermal relic neutralinos. Including Sommerfeld enhancements to relic abundance and halo annihilation calculations, we obtain direct, indirect, and collider discovery prospects for all neutralinos with mass parameters $M_1,M_2,|\mu| < 4$ TeV, that freeze out to the observed dark matter abundance, with scalar superpartners decoupled. Much of the relic neutralino sector will be uncovered by the direct detection experiments Xenon1T and LZ, as well as indirect detection with CTA. We emphasize that thermal relic higgsinos will be found by next-generation direct detection experiments, so long as $M_{1,2} < 4$ TeV. Charged tracks at a 100 TeV hadron collider complement indirect searches for relic winos. Thermal relic bino-winos still evade all planned experiments, including disappearing charged-track searches. However, they can be discovered by compressed electroweakino searches at a 100 TeV collider, completing the full coverage of the relic neutralino surface. |
0806.4551 | Nikolaos Stefanis | I. V. Anikin, I. O. Cherednikov, N. G. Stefanis, O. V. Teryaev | Duality between different mechanisms of QCD factorization in
\gamma^*\gamma collisions | 14 pages, 8 figures. Substantial changes in the text, 4 figures
added, 1 removed; no changes in conclusions | Eur.Phys.J.C61:357-367,2009 | 10.1140/epjc/s10052-009-1010-6 | RUB-TPII-04/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenon of duality in hard exclusive reactions to which QCD
factorization applies. Considering "two-photon"-like processes in the scalar
$\phi^3_E$ model and also hadron-pair production from the collisions of a real
(transversely polarized) and a highly virtual, longitudinally polarized, photon
in QCD, we identify two regimes of factorization each of them associated with a
distinct nonperturbative mechanism. One mechanism involves twist-3 Generalized
Distribution Amplitudes, whereas the other one employs leading-twist Transition
Distribution Amplitudes. In the case of the scalar $\phi^3_E$ model, we find
duality in that kinematical region where the two mechanisms overlap. In the QCD
case, the appearance of duality is sensitive to the particular nonperturbative
model applied and can, therefore, be used as an additional adjudicator.
| [
{
"created": "Fri, 27 Jun 2008 15:44:07 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 2008 18:31:49 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Sep 2008 11:16:10 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Dec 2008 14:08:46 GMT",
"version": "v4"
}
] | 2009-07-22 | [
[
"Anikin",
"I. V.",
""
],
[
"Cherednikov",
"I. O.",
""
],
[
"Stefanis",
"N. G.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | We study the phenomenon of duality in hard exclusive reactions to which QCD factorization applies. Considering "two-photon"-like processes in the scalar $\phi^3_E$ model and also hadron-pair production from the collisions of a real (transversely polarized) and a highly virtual, longitudinally polarized, photon in QCD, we identify two regimes of factorization each of them associated with a distinct nonperturbative mechanism. One mechanism involves twist-3 Generalized Distribution Amplitudes, whereas the other one employs leading-twist Transition Distribution Amplitudes. In the case of the scalar $\phi^3_E$ model, we find duality in that kinematical region where the two mechanisms overlap. In the QCD case, the appearance of duality is sensitive to the particular nonperturbative model applied and can, therefore, be used as an additional adjudicator. |
2408.05716 | Fangyu Liu | Hoernisa Iminniyaz, Alimasi Aisha, Fangyu Liu | Constraints on non-standard cosmological models from Planck data | 10 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We review the relic density of dark matter in the non-standard cosmological
scenarios which includes kination models, brane world cosmology and shear
dominated universe. Then we use the Planck data to find constraints on the
parameter spaces as dark matter cross sections and the five dimentional Planck
mass for brane cosmology, enhancement factor for kination model and the
inverse-scaled shear temperature for shear dominated universe.
| [
{
"created": "Sun, 11 Aug 2024 08:00:23 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Iminniyaz",
"Hoernisa",
""
],
[
"Aisha",
"Alimasi",
""
],
[
"Liu",
"Fangyu",
""
]
] | We review the relic density of dark matter in the non-standard cosmological scenarios which includes kination models, brane world cosmology and shear dominated universe. Then we use the Planck data to find constraints on the parameter spaces as dark matter cross sections and the five dimentional Planck mass for brane cosmology, enhancement factor for kination model and the inverse-scaled shear temperature for shear dominated universe. |
hep-ph/0208027 | null | Thomas G. Rizzo | Unique Identification of Graviton Exchange Effects in e^+ e^- Collisions | 21 pages, 3 figs, LaTex | JHEP 0210 (2002) 013 | 10.1088/1126-6708/2002/10/013 | SLAC-PUB-9295 | hep-ph | null | Many types of new physics can lead to contact interaction-like modifications
in e^+ e^- processes below direct production threshold. We examine the
possibility of uniquely identifying the effects of graviton exchange, which are
anticipated in many extra dimensional theories, from amongst this large set of
models by using the moments of the angular distribution of the final state
particles. In the case of the e^+ e^- --> f bar{f} process we demonstrate that
this technique allows for the unique identification of the graviton exchange
signature at the 5 sigma level for mass scales as high as 6 sqrt(s). The
extension of this method to the e^+ e^- --> W^+ W^- process is also discussed.
| [
{
"created": "Fri, 2 Aug 2002 18:43:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Rizzo",
"Thomas G.",
""
]
] | Many types of new physics can lead to contact interaction-like modifications in e^+ e^- processes below direct production threshold. We examine the possibility of uniquely identifying the effects of graviton exchange, which are anticipated in many extra dimensional theories, from amongst this large set of models by using the moments of the angular distribution of the final state particles. In the case of the e^+ e^- --> f bar{f} process we demonstrate that this technique allows for the unique identification of the graviton exchange signature at the 5 sigma level for mass scales as high as 6 sqrt(s). The extension of this method to the e^+ e^- --> W^+ W^- process is also discussed. |
2309.07052 | Gabriele Levati | Luca Di Luzio, Gabriele Levati, Paride Paradisi, Xavier Ponce D\'iaz | Low-energy flavour probes of light vector bosons | 8 pages, 2 figures, Proceedings to "Les Rencontres de Physique de la
Vall\'ee d'Aoste" (March 5-11, 2023, La Thuile) | null | 10.1393/ncc/i2024-24009-0 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In this work, we construct the chiral Lagrangian for a light spin-1 boson $X$
possessing both vectorial and axial couplings to the light Standard Model
quarks $u, d, s$. We then use it in order to describe the tree-level,
model-independent contributions to the $\Delta S = 1$ transition $K^\pm
\rightarrow \pi^\pm X$, which is induced by Standard Model charged currents and
is possibly enhanced by the emission of a longitudinally polarized $X$ boson.
Such a flavour observable is then shown to set the best model-independent
bounds on the diagonal axial couplings of $X$ to light quarks in the mass range
allowed by the decay kinematics, improving the currently available constraints
from beam-dump experiments and collider searches.
| [
{
"created": "Wed, 13 Sep 2023 16:08:51 GMT",
"version": "v1"
}
] | 2024-01-11 | [
[
"Di Luzio",
"Luca",
""
],
[
"Levati",
"Gabriele",
""
],
[
"Paradisi",
"Paride",
""
],
[
"Díaz",
"Xavier Ponce",
""
]
] | In this work, we construct the chiral Lagrangian for a light spin-1 boson $X$ possessing both vectorial and axial couplings to the light Standard Model quarks $u, d, s$. We then use it in order to describe the tree-level, model-independent contributions to the $\Delta S = 1$ transition $K^\pm \rightarrow \pi^\pm X$, which is induced by Standard Model charged currents and is possibly enhanced by the emission of a longitudinally polarized $X$ boson. Such a flavour observable is then shown to set the best model-independent bounds on the diagonal axial couplings of $X$ to light quarks in the mass range allowed by the decay kinematics, improving the currently available constraints from beam-dump experiments and collider searches. |
1512.05870 | Guo-Li Wang | Wan-Li Ju, Tianhong Wang, Yue Jiang, Han Yuan, Guo-Li Wang | The nonleptonic charmless decays of $B_c$ meson | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, with the framework of (p)NRQCD and SCET, the processes $B_c\to
M_1 M_2$ are investigated. Here $M_{1(2)}$ denotes the light charmless meson,
such as $\pi$, $\rho$, $K$ or $K^*$. Based on the SCET power counting rules,
the leading transition amplitudes are picked out, which include $A_{wA}^2$,
$A_{wB}^2$, $A_{wC}^2$, $A_{wD}^2$ and $A_{c}^0$. From SCET, their
factorization formulae are proven. Based on the obtained factorization
formulae, in particular, the numerical calculation on $A_{wB}^2$ is performed.
| [
{
"created": "Fri, 18 Dec 2015 08:25:16 GMT",
"version": "v1"
}
] | 2015-12-21 | [
[
"Ju",
"Wan-Li",
""
],
[
"Wang",
"Tianhong",
""
],
[
"Jiang",
"Yue",
""
],
[
"Yuan",
"Han",
""
],
[
"Wang",
"Guo-Li",
""
]
] | In this paper, with the framework of (p)NRQCD and SCET, the processes $B_c\to M_1 M_2$ are investigated. Here $M_{1(2)}$ denotes the light charmless meson, such as $\pi$, $\rho$, $K$ or $K^*$. Based on the SCET power counting rules, the leading transition amplitudes are picked out, which include $A_{wA}^2$, $A_{wB}^2$, $A_{wC}^2$, $A_{wD}^2$ and $A_{c}^0$. From SCET, their factorization formulae are proven. Based on the obtained factorization formulae, in particular, the numerical calculation on $A_{wB}^2$ is performed. |
1604.06772 | V\'ictor Miguel Banda Guzm\'an | V. M. Banda Guzman, M. Kirchbach | Second order differential realization of the Bargmann-Wigner framework
for particles of any spin | null | null | null | null | hep-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bargmann-Wigner (BW) framework describes particles of spin-j in terms of
Dirac spinors of rank 2j, obtained as the local direct product of n Dirac
spinor copies, with n=2j. Such spinors are reducible, and contain also
(j,0)+(0,j)-pure spin representation spaces. The 2(2j+1) degrees of freedom of
the latter are identified by a projector given by the n-fold direct product of
the covariant parity projector within the Dirac spinor space. Considering
totally symmetric tensor spinors one is left with the expected number of
2(2j+1) independent degrees of freedom. The BW projector is of the order
$\partial ^{2j}$ in the derivatives, and so are the related spin-j wave
equations and associated Lagrangians. High order differential equations can not
be consistently gauged, and allow several unphysical aspects, such as
non-locality, acausality, ghosts and etc to enter the theory. In order to avoid
these difficulties we here suggest a strategy of replacing the high order of
the BW wave equations by the universal second order. To do so we replaced the
BW projector by one of zeroth order in the derivatives. We built it up from one
of the Casimir invariants of the Lorentz group when exclusively acting on
spaces of internal spin degrees of freedom. This projector allows one to
identify anyone of the irreducible sectors of the primordial rank-2j spinor, in
particular (j,0)+(0,j), and without any reference to the external space-time
and the four-momentum. The dynamics is then introduced by requiring the (j,0)+
(0,j) sector to satisfy the Klein-Gordon equation. The scheme allows for a
consistent minimal gauging.
| [
{
"created": "Fri, 22 Apr 2016 18:49:09 GMT",
"version": "v1"
}
] | 2016-04-25 | [
[
"Guzman",
"V. M. Banda",
""
],
[
"Kirchbach",
"M.",
""
]
] | The Bargmann-Wigner (BW) framework describes particles of spin-j in terms of Dirac spinors of rank 2j, obtained as the local direct product of n Dirac spinor copies, with n=2j. Such spinors are reducible, and contain also (j,0)+(0,j)-pure spin representation spaces. The 2(2j+1) degrees of freedom of the latter are identified by a projector given by the n-fold direct product of the covariant parity projector within the Dirac spinor space. Considering totally symmetric tensor spinors one is left with the expected number of 2(2j+1) independent degrees of freedom. The BW projector is of the order $\partial ^{2j}$ in the derivatives, and so are the related spin-j wave equations and associated Lagrangians. High order differential equations can not be consistently gauged, and allow several unphysical aspects, such as non-locality, acausality, ghosts and etc to enter the theory. In order to avoid these difficulties we here suggest a strategy of replacing the high order of the BW wave equations by the universal second order. To do so we replaced the BW projector by one of zeroth order in the derivatives. We built it up from one of the Casimir invariants of the Lorentz group when exclusively acting on spaces of internal spin degrees of freedom. This projector allows one to identify anyone of the irreducible sectors of the primordial rank-2j spinor, in particular (j,0)+(0,j), and without any reference to the external space-time and the four-momentum. The dynamics is then introduced by requiring the (j,0)+ (0,j) sector to satisfy the Klein-Gordon equation. The scheme allows for a consistent minimal gauging. |
1110.3929 | Swatantra Tiwari | P. K. Khandai, P. Shukla, and V. Singh | Meson spectra and m_T scaling in p+p, d+Au and Au+Au collisions at
\sqrtS_NN=200 GeV | 21 pages, 14 figures, Accepted for publication in Phys. Rev. C | null | 10.1103/PhysRevC.84.054904 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The meson spectra provide insight into the particle production mechanism and
interaction in the hadronic and quark gluon plasma (QGP) phases. The detailed
study of systematics of meson spectra is important also because it acts as
ingredient for estimating the hadronic decay backgrounds in the photon, single
lepton and dilepton spectra which are the penetrating probes of quark gluon
plasma. In this work, we parameterize experimentally measured pion spectra and
then obtain the spectra of other light mesons using a property known as $m_T$
scaling. The $m_{T}$ scaled spectra for each meson is compared with
experimental data for p+p, d+Au and Au+Au systems at $\surd s_{NN} $ = 200 GeV.
The agreement of the $m_{T}$ scaled and experimental data shapes are excellent
in most cases and their fitted relative normalization gives ratio of meson to
pion $m_T$ spectra. These ratios are useful to obtain the hadronic decay
contribution in photonic and leptonic channels but also point to the
quantitative changes in the dynamics of the heavy ion collision over p+p
collisions. It is shown that, the particles with charm contents behave
differently as compared to pions in d+Au systems and particles either with
strange or charm contents behave differently from pions in Au+Au systems. For
Au+Au system, three centrality classes have been studied which reveal that for
the particles like kaon and $\phi$, peripheral collision data is better
reproduced as compared to central and their relative ratios with pions also
increase as the collisions become more central.
| [
{
"created": "Tue, 18 Oct 2011 10:24:50 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Khandai",
"P. K.",
""
],
[
"Shukla",
"P.",
""
],
[
"Singh",
"V.",
""
]
] | The meson spectra provide insight into the particle production mechanism and interaction in the hadronic and quark gluon plasma (QGP) phases. The detailed study of systematics of meson spectra is important also because it acts as ingredient for estimating the hadronic decay backgrounds in the photon, single lepton and dilepton spectra which are the penetrating probes of quark gluon plasma. In this work, we parameterize experimentally measured pion spectra and then obtain the spectra of other light mesons using a property known as $m_T$ scaling. The $m_{T}$ scaled spectra for each meson is compared with experimental data for p+p, d+Au and Au+Au systems at $\surd s_{NN} $ = 200 GeV. The agreement of the $m_{T}$ scaled and experimental data shapes are excellent in most cases and their fitted relative normalization gives ratio of meson to pion $m_T$ spectra. These ratios are useful to obtain the hadronic decay contribution in photonic and leptonic channels but also point to the quantitative changes in the dynamics of the heavy ion collision over p+p collisions. It is shown that, the particles with charm contents behave differently as compared to pions in d+Au systems and particles either with strange or charm contents behave differently from pions in Au+Au systems. For Au+Au system, three centrality classes have been studied which reveal that for the particles like kaon and $\phi$, peripheral collision data is better reproduced as compared to central and their relative ratios with pions also increase as the collisions become more central. |
2212.12547 | Tran Quang Thong Nguyen | Thong T. Q. Nguyen and Tim M. P. Tait | Bounds on Long-lived Dark Matter Mediators from Neutron Stars | 7 pages, 6 figures (2 sub-figures). Published version on PRD | Phys. Rev. D 107 (2023) 115016 | 10.1103/PhysRevD.107.115016 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutron stars close to the Galactic center are expected to swim in a dense
background of dark matter. For models in which the dark matter has efficient
interactions with neutrons, they are expected to accumulate their own local
cloud of dark matter, making them appealing targets for observations seeking
signs of dark matter annihilation. For theories with very light mediators, the
dark matter may annihilate into pairs of mediators which are sufficiently
long-lived to escape the star and decay outside it into neutrinos. We examine
the bounds on the parameter space of heavy ($\sim$TeV to $\sim$PeV) dark matter
theories with long-lived mediators decaying into neutrinos based on
observations of high energy neutrino observatories, and make projections for
the future. We find that these observations provide information that is
complementary to terrestrial searches, and probe otherwise inaccessible regimes
of dark matter parameter space.
| [
{
"created": "Fri, 23 Dec 2022 19:00:03 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Jan 2023 03:06:37 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Jun 2023 11:10:13 GMT",
"version": "v3"
}
] | 2023-06-16 | [
[
"Nguyen",
"Thong T. Q.",
""
],
[
"Tait",
"Tim M. P.",
""
]
] | Neutron stars close to the Galactic center are expected to swim in a dense background of dark matter. For models in which the dark matter has efficient interactions with neutrons, they are expected to accumulate their own local cloud of dark matter, making them appealing targets for observations seeking signs of dark matter annihilation. For theories with very light mediators, the dark matter may annihilate into pairs of mediators which are sufficiently long-lived to escape the star and decay outside it into neutrinos. We examine the bounds on the parameter space of heavy ($\sim$TeV to $\sim$PeV) dark matter theories with long-lived mediators decaying into neutrinos based on observations of high energy neutrino observatories, and make projections for the future. We find that these observations provide information that is complementary to terrestrial searches, and probe otherwise inaccessible regimes of dark matter parameter space. |
hep-ph/9706353 | Gennadi Lykasov | O.Benhar, S.Fantoni, G.I.Lykasov and N.V.Slavin | Q**2-dependence of deep inelastic lepton scattering off nuclear targets | 11 pages including figs. Figs. can be sent by PS-file | Phys.Rev.C57:1532-1535,1998 | 10.1103/PhysRevC.57.1532 | null | hep-ph | null | Deep inelastic scattering of leptons off nuclear targets is analized within
the convolution model taking into account nucleon-nucleon correlations. We show
that in the nuclear medium nucleons are distributed according to a function
that exhibits a sizeable Q**2-dependence and reduces to the ordinary light-cone
distribution in the Bjorken limit. At Q**2 < 50 (GeV/c)**2 and x > 1 this
Q**2-dependence turns out to be stronger than the one associated with the
nucleon structure function, predicted by pertubative quantum chromodynamics.
| [
{
"created": "Fri, 13 Jun 1997 15:29:07 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Benhar",
"O.",
""
],
[
"Fantoni",
"S.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Slavin",
"N. V.",
""
]
] | Deep inelastic scattering of leptons off nuclear targets is analized within the convolution model taking into account nucleon-nucleon correlations. We show that in the nuclear medium nucleons are distributed according to a function that exhibits a sizeable Q**2-dependence and reduces to the ordinary light-cone distribution in the Bjorken limit. At Q**2 < 50 (GeV/c)**2 and x > 1 this Q**2-dependence turns out to be stronger than the one associated with the nucleon structure function, predicted by pertubative quantum chromodynamics. |
0709.2740 | Ben Gripaios | Ben Gripaios | Transverse Observables and Mass Determination at Hadron Colliders | 4 pages; version published in JHEP | JHEP0802:053,2008 | 10.1088/1126-6708/2008/02/053 | null | hep-ph hep-ex physics.data-an | null | I consider the two-body decay of a particle at a hadron collider into a
visible and an invisible particle, generalizing $W \to e \nu$, where the masses
of the decaying particle and the invisible decay particle are, {\em a priori},
unknown. I prove that the transverse mass, when maximized over possible
kinematic configurations, can be used to determine both of the unknown masses.
I argue that the proof can be generalized to cover cases such as decays of
pair-produced superpartners to the lightest, stable superpartner at the Large
Hadron Collider.
| [
{
"created": "Tue, 18 Sep 2007 19:57:20 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2007 10:48:54 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Feb 2008 12:51:46 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gripaios",
"Ben",
""
]
] | I consider the two-body decay of a particle at a hadron collider into a visible and an invisible particle, generalizing $W \to e \nu$, where the masses of the decaying particle and the invisible decay particle are, {\em a priori}, unknown. I prove that the transverse mass, when maximized over possible kinematic configurations, can be used to determine both of the unknown masses. I argue that the proof can be generalized to cover cases such as decays of pair-produced superpartners to the lightest, stable superpartner at the Large Hadron Collider. |
1403.2351 | Egle Tomasi-Gustafsson | G. I. Gakh, A. G. Gakh, E. Tomasi--Gustafsson | Polarization observables in lepton-deuteron elastic scattering including
the lepton mass | 29 pages, 6 figure | null | 10.1103/PhysRevC.90.064901 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Expressions for the unpolarized differential cross section and for various
polarization observables in the lepton-deuteron elastic scattering, $\ell+D\to
\ell+D$, $\ell=e$, $\mu$, $\tau$, have been obtained in one-photon-exchange
approximation, taking into account the lepton mass. Polarization effects have
been investigated for the case of a polarized lepton beam and polarized
deuteron target which can have vector or tensor polarization. Numerical
estimations of the lepton mass effects have been done for the unpolarized
differential cross section and for some polarization observables and applied to
the case of low energy muon deuteron elastic scattering.
| [
{
"created": "Mon, 10 Mar 2014 19:15:50 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Gakh",
"G. I.",
""
],
[
"Gakh",
"A. G.",
""
],
[
"Tomasi--Gustafsson",
"E.",
""
]
] | Expressions for the unpolarized differential cross section and for various polarization observables in the lepton-deuteron elastic scattering, $\ell+D\to \ell+D$, $\ell=e$, $\mu$, $\tau$, have been obtained in one-photon-exchange approximation, taking into account the lepton mass. Polarization effects have been investigated for the case of a polarized lepton beam and polarized deuteron target which can have vector or tensor polarization. Numerical estimations of the lepton mass effects have been done for the unpolarized differential cross section and for some polarization observables and applied to the case of low energy muon deuteron elastic scattering. |
hep-ph/0601111 | Vincenzo Cirigliano | Vincenzo Cirigliano and Benjamin Grinstein | Phenomenology of Minimal Lepton Flavor Violation | 23 pages, 6 figures | Nucl.Phys.B752:18-39,2006 | 10.1016/j.nuclphysb.2006.06.021 | KRL-MAP-316, UCSD/PTH-06-01 | hep-ph | null | We extend the effective theory of Minimal Lepton Flavor Violation (MLFV) by
including four-lepton operators. We compute the rates for mu -> 3 e and tau ->
3 ell decays and point out several new ways to test the hypothesis of MLFV. We
also investigate to what extent it will be possible from (future) experimental
information to pin down the contributions of different effective operators. In
particular we look for experimental handles on quark-lepton operators of the
type $\bar{ell}_i \Gamma \ell_j \times \bar q \Gamma q$ by working out their
contribution to hadronic processes such as tau -> mu pi^0, pi^0 -> mu^- e^+, Y
-> tau^- mu^+, as well as to purely leptonic decays such as mu -> 3 e through
loop effects.
| [
{
"created": "Fri, 13 Jan 2006 19:57:20 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2006 23:42:23 GMT",
"version": "v2"
}
] | 2009-08-05 | [
[
"Cirigliano",
"Vincenzo",
""
],
[
"Grinstein",
"Benjamin",
""
]
] | We extend the effective theory of Minimal Lepton Flavor Violation (MLFV) by including four-lepton operators. We compute the rates for mu -> 3 e and tau -> 3 ell decays and point out several new ways to test the hypothesis of MLFV. We also investigate to what extent it will be possible from (future) experimental information to pin down the contributions of different effective operators. In particular we look for experimental handles on quark-lepton operators of the type $\bar{ell}_i \Gamma \ell_j \times \bar q \Gamma q$ by working out their contribution to hadronic processes such as tau -> mu pi^0, pi^0 -> mu^- e^+, Y -> tau^- mu^+, as well as to purely leptonic decays such as mu -> 3 e through loop effects. |
hep-ph/0404215 | Alvaro de Rujula | Alvaro De Rujula | Fifty years of Yang-Mills Theories: a phenomenological point of view | Contribution to a book on "Fifty years of Yang-Mills Theories". 26
pages, including 10 figures | null | null | null | hep-ph hep-th physics.hist-ph | null | On the occasion of the celebration of the first half-century of Yang--Mills
theories, I am contributing a personal recollection of how the subject, in its
early times, confronted physical reality, that is, its "phenomenology". There
is nothing original in this work, except, perhaps, my own points of view. But I
hope that the older practitioners of the field will find here grounds for
nostalgia, or good reasons to disagree with me. Younger addicts may learn that
history does not resemble at all what is reflected in current textbooks: it was
orders of magnitude more fascinating.
| [
{
"created": "Fri, 23 Apr 2004 19:36:18 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2004 12:47:38 GMT",
"version": "v2"
},
{
"created": "Mon, 3 May 2004 13:14:25 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Jun 2004 18:02:08 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"De Rujula",
"Alvaro",
""
]
] | On the occasion of the celebration of the first half-century of Yang--Mills theories, I am contributing a personal recollection of how the subject, in its early times, confronted physical reality, that is, its "phenomenology". There is nothing original in this work, except, perhaps, my own points of view. But I hope that the older practitioners of the field will find here grounds for nostalgia, or good reasons to disagree with me. Younger addicts may learn that history does not resemble at all what is reflected in current textbooks: it was orders of magnitude more fascinating. |
hep-ph/0011231 | null | I.I. Bigi | CP, T and CPT Symmetries at the Turn of a New Millenium | 21 pages, LaTex, Lecture given at LEAP2000, Venice, Italy, Aug. 21 -
26, 2000 | Nucl.Phys. A692 (2001) 227-242 | 10.1016/S0375-9474(01)01183-6 | UND-HEP-00-BIG10 | hep-ph | null | After summarizing the status concerning CP violation in 1998 I describe the
exciting developments of the last two years and extrapolate to the future. I
comment on recent lessons about T and CPT invariance maninly from CPLEAR and
emphasize the potential of finding New Physics by analyzing $K_{\mu 3}$ and
charm decays and searching for electric dipole moments.
| [
{
"created": "Sun, 19 Nov 2000 06:57:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bigi",
"I. I.",
""
]
] | After summarizing the status concerning CP violation in 1998 I describe the exciting developments of the last two years and extrapolate to the future. I comment on recent lessons about T and CPT invariance maninly from CPLEAR and emphasize the potential of finding New Physics by analyzing $K_{\mu 3}$ and charm decays and searching for electric dipole moments. |
0910.5443 | Mathieu Segond | R. Kirschner, M. Segond | Small x resummation in collinear factorisation | 34 pages, 6 figures | Eur.Phys.J.C68:425-446,2010 | 10.1140/epjc/s10052-010-1363-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The summation of the small x-corrections to hard-scattering QCD amplitudes by
collinear factorisation method is reconsidered and the K-factor is derived in
leading ln x approximation with a result differing from the corresponding
expression by Catani and Hautmann (Nucl. Phys. B 427, 475, 1994). The
significance of the difference is demonstrated in the examples of structure
function F_L and of exclusive vector meson electroproduction. The formulation
covers the channels of non-vanishing conformal spin n paving the way for new
applications.
| [
{
"created": "Wed, 28 Oct 2009 17:36:15 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Sep 2010 15:45:02 GMT",
"version": "v2"
}
] | 2016-11-25 | [
[
"Kirschner",
"R.",
""
],
[
"Segond",
"M.",
""
]
] | The summation of the small x-corrections to hard-scattering QCD amplitudes by collinear factorisation method is reconsidered and the K-factor is derived in leading ln x approximation with a result differing from the corresponding expression by Catani and Hautmann (Nucl. Phys. B 427, 475, 1994). The significance of the difference is demonstrated in the examples of structure function F_L and of exclusive vector meson electroproduction. The formulation covers the channels of non-vanishing conformal spin n paving the way for new applications. |
1103.0735 | Felipe J. Llanes-Estrada | Antonio Dobado, Felipe J. Llanes-Estrada and Juan M. Torres-Rincon
(Univ. Complutense Madrid) | Bulk viscosity of low-temperature strongly interacting matter | 8 pages, 8 figures | null | 10.1016/j.physletb.2011.06.059 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the bulk viscosity of a pion gas in unitarized Chiral Perturbation
Theory at low and moderate temperatures, below any phase transition to a
quark-gluon plasma phase. We argue that inelastic processes are irrelevant and
exponentially suppressed at low temperatures. Since the system falls out of
chemical equilibrium upon expansion,a pion chemical potential must be
introduced, so we extend the existing theory to include it. We control the zero
modes of the collision operator and Landau's conditions of fit when solving the
Boltzmann equation with the elastic collision kernel. The dependence of the
bulk viscosity with temperature is reminiscent of the findings of
Fernandez-Fraile and Gomez Nicola, while the numerical value is closer to that
of Davesne. In the zero-temperature limit we correctly recover the vanishing
viscosity associated to a non-relativistic monoatomic gas.
| [
{
"created": "Thu, 3 Mar 2011 17:16:33 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Dobado",
"Antonio",
"",
"Univ. Complutense Madrid"
],
[
"Llanes-Estrada",
"Felipe J.",
"",
"Univ. Complutense Madrid"
],
[
"Torres-Rincon",
"Juan M.",
"",
"Univ. Complutense Madrid"
]
] | We study the bulk viscosity of a pion gas in unitarized Chiral Perturbation Theory at low and moderate temperatures, below any phase transition to a quark-gluon plasma phase. We argue that inelastic processes are irrelevant and exponentially suppressed at low temperatures. Since the system falls out of chemical equilibrium upon expansion,a pion chemical potential must be introduced, so we extend the existing theory to include it. We control the zero modes of the collision operator and Landau's conditions of fit when solving the Boltzmann equation with the elastic collision kernel. The dependence of the bulk viscosity with temperature is reminiscent of the findings of Fernandez-Fraile and Gomez Nicola, while the numerical value is closer to that of Davesne. In the zero-temperature limit we correctly recover the vanishing viscosity associated to a non-relativistic monoatomic gas. |
2111.10394 | Juan Antonio Aguilar-Saavedra | J. A. Aguilar-Saavedra, M.C.N. Fiolhais, P. Mart\'in-Ramiro, J. M.
Moreno, A. Onofre | A template method to measure the $t \bar t$ polarisation | LaTeX 9 pages. Minor changes and some extra discussions, final
version in EPJC | null | 10.1140/epjc/s10052-022-10063-z | IFT-UAM/CSIC-21-123 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a template method for the measurement of the polarisation of $t
\bar t$ pairs produced in hadron collisions. The method would allow to extract
the individual fractions of $t_L \bar t_L$, $t_R \bar t_R$, $t_L \bar t_R$ and
$t_R \bar t_L$ pairs with a fit to data, where $L,R$ refer to the polarisation
along any axis. These polarisation fractions have not been independently
measured at present. Secondarily, the method also provides the net polarisation
of $t$ and $\bar t$, as well as their spin correlation for arbitrary axes.
| [
{
"created": "Fri, 19 Nov 2021 19:09:48 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 11:46:48 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Fiolhais",
"M. C. N.",
""
],
[
"Martín-Ramiro",
"P.",
""
],
[
"Moreno",
"J. M.",
""
],
[
"Onofre",
"A.",
""
]
] | We develop a template method for the measurement of the polarisation of $t \bar t$ pairs produced in hadron collisions. The method would allow to extract the individual fractions of $t_L \bar t_L$, $t_R \bar t_R$, $t_L \bar t_R$ and $t_R \bar t_L$ pairs with a fit to data, where $L,R$ refer to the polarisation along any axis. These polarisation fractions have not been independently measured at present. Secondarily, the method also provides the net polarisation of $t$ and $\bar t$, as well as their spin correlation for arbitrary axes. |
1301.4693 | Nigel Glover | James Currie, E.W.N. Glover, Steven Wells | Infrared Structure at NNLO Using Antenna Subtraction | 65 pages, 7 figures, minor changes, version accepted by JHEP | null | 10.1007/JHEP04(2013)066 | IPPP/12/82, ZU-TH 26/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the infrared structure of hadron-hadron collisions at
next-to-next-to leading order using the antenna subtraction method. The general
form of the subtraction terms is presented for double real, real-virtual and
double virtual contributions. At NLO and NNLO it is shown that the virtual and
double virtual subtraction terms can be written in terms of integrated dipoles,
formed by systematically combining the mass factorisation contributions and
integrated antenna functions. The integrated dipoles describing $\ell$
unresolved partons, denoted $\bs{J}_{2}^{(\ell)}$, are related to Catani's IR
singularity operators, $\bs{I}_{ij}^{(\ell)}(\eps)$. It is shown that the IR
pole structure of the virtual and double virtual contributions can be written
as a sum over integrated dipoles within the antenna subtraction formalism and
the master expressions analogous to Catani's one- and two-loop factorisation
formulae are derived. To demonstrate the techniques described in this paper, we
apply antenna subtraction to the production of two gluon jets via
quark-antiquark scattering at NLO and NNLO. Double real, real-virtual and
double virtual subtraction terms are explicitly derived for the leading colour
NNLO contribution.
| [
{
"created": "Sun, 20 Jan 2013 21:30:50 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Apr 2013 14:51:26 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Currie",
"James",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Wells",
"Steven",
""
]
] | We consider the infrared structure of hadron-hadron collisions at next-to-next-to leading order using the antenna subtraction method. The general form of the subtraction terms is presented for double real, real-virtual and double virtual contributions. At NLO and NNLO it is shown that the virtual and double virtual subtraction terms can be written in terms of integrated dipoles, formed by systematically combining the mass factorisation contributions and integrated antenna functions. The integrated dipoles describing $\ell$ unresolved partons, denoted $\bs{J}_{2}^{(\ell)}$, are related to Catani's IR singularity operators, $\bs{I}_{ij}^{(\ell)}(\eps)$. It is shown that the IR pole structure of the virtual and double virtual contributions can be written as a sum over integrated dipoles within the antenna subtraction formalism and the master expressions analogous to Catani's one- and two-loop factorisation formulae are derived. To demonstrate the techniques described in this paper, we apply antenna subtraction to the production of two gluon jets via quark-antiquark scattering at NLO and NNLO. Double real, real-virtual and double virtual subtraction terms are explicitly derived for the leading colour NNLO contribution. |
1804.07313 | Peter Marquard | J. Ablinger, J. Bl\"umlein, P. Marquard, N. Rana, C. Schneider | Heavy Quark Form Factors at Three Loops in the Planar Limit | 9 pages, 4 figures | null | 10.1016/j.physletb.2018.05.077 | DESY 18--052 DO--TH 18/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the color-planar and complete light quark non-singlet
contributions to the heavy quark form factors in the case of the axialvector,
scalar and pseudoscalar currents at three loops in perturbative QCD. We
evaluate the master integrals applying a new method based on differential
equations for general bases, which is applicable for all first order
factorizing systems. The analytic results are expressed in terms of harmonic
polylogarithms and real-valued cyclotomic harmonic polylogarithms.
| [
{
"created": "Thu, 19 Apr 2018 18:00:16 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Ablinger",
"J.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Marquard",
"P.",
""
],
[
"Rana",
"N.",
""
],
[
"Schneider",
"C.",
""
]
] | We compute the color-planar and complete light quark non-singlet contributions to the heavy quark form factors in the case of the axialvector, scalar and pseudoscalar currents at three loops in perturbative QCD. We evaluate the master integrals applying a new method based on differential equations for general bases, which is applicable for all first order factorizing systems. The analytic results are expressed in terms of harmonic polylogarithms and real-valued cyclotomic harmonic polylogarithms. |
0911.2987 | Larry McLerran | Larry McLerran | Theoretical Concepts for Ultra-Relativistic Heavy Ion Collisions | To be published in the proceedings of DPF-2009, Detroit, MI, July
2009, eConf C090726 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various forms of matter may be produced in ultra-relativistic heavy ion
collisions. These are the Quark Gluon Plasma, the Color Glass Condensate, the
Glasma and Quarkyonic Matter. A novel effect that may be associated with
topological charge fluctuations is the Chiral Magnetic Effect. I explain these
concepts and explain how they may be seen in ultra-relativistic heavy ion
collisions.
| [
{
"created": "Mon, 16 Nov 2009 09:33:58 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2009 11:20:21 GMT",
"version": "v2"
}
] | 2009-11-18 | [
[
"McLerran",
"Larry",
""
]
] | Various forms of matter may be produced in ultra-relativistic heavy ion collisions. These are the Quark Gluon Plasma, the Color Glass Condensate, the Glasma and Quarkyonic Matter. A novel effect that may be associated with topological charge fluctuations is the Chiral Magnetic Effect. I explain these concepts and explain how they may be seen in ultra-relativistic heavy ion collisions. |
hep-ph/9407287 | Marek Karliner | John Ellis and Marek Karliner | Determination of $\alpha_s$ and the Nucleon Spin Decomposition Using
Recent Polarized Structure Function Data | 15 pages (LateX) + 5 postscript figures appended after the text;
CERN-TH-7324/94, TAUP-2178-94 | Phys.Lett.B341:397-406,1995 | 10.1016/0370-2693(95)80021-O | null | hep-ph | null | New data on polarized $\mu-p$ and $e-p$ scattering permit a first
determination of $\alpha_s$ using the Bjorken sum rule, as well as higher
precision in determining the nucleon spin decomposition. Using perturbative QCD
calculations to $O(\alpha_s^4)$ for the non-singlet combination of structure
functions, we find $\alpha_s(2.5 GeV^2) = 0.375^{+0.062}_{-0.081}$,
corresponding to $\alpha_s(M_Z^2) =0.122^{+0.005}_{-0.009}$, and using
calculations to $O(\alpha_s^3)$ for the singlet combination we find $\Delta u =
0.83 \pm 0.03$, $\Delta d= -0.43 \pm 0.03$, $\Delta s =-0.10 \pm 0.03$, $\Delta
\Sigma \equiv \Delta u + \Delta d + \Ds = 0.31 \pm 0.07$, at a renormalization
scale $Q^2=10 GeV^2$. Perturbative QCD corrections play an essential role in
reconciling the interpretations of data taken using different targets. We
discuss higher-twist uncertainties in these determinations. The $\Delta q$
determinations are used to update predictions for the couplings of massive Cold
Dark Matter particles and axions to nucleons.
| [
{
"created": "Wed, 13 Jul 1994 13:39:00 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 1994 14:00:00 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Ellis",
"John",
""
],
[
"Karliner",
"Marek",
""
]
] | New data on polarized $\mu-p$ and $e-p$ scattering permit a first determination of $\alpha_s$ using the Bjorken sum rule, as well as higher precision in determining the nucleon spin decomposition. Using perturbative QCD calculations to $O(\alpha_s^4)$ for the non-singlet combination of structure functions, we find $\alpha_s(2.5 GeV^2) = 0.375^{+0.062}_{-0.081}$, corresponding to $\alpha_s(M_Z^2) =0.122^{+0.005}_{-0.009}$, and using calculations to $O(\alpha_s^3)$ for the singlet combination we find $\Delta u = 0.83 \pm 0.03$, $\Delta d= -0.43 \pm 0.03$, $\Delta s =-0.10 \pm 0.03$, $\Delta \Sigma \equiv \Delta u + \Delta d + \Ds = 0.31 \pm 0.07$, at a renormalization scale $Q^2=10 GeV^2$. Perturbative QCD corrections play an essential role in reconciling the interpretations of data taken using different targets. We discuss higher-twist uncertainties in these determinations. The $\Delta q$ determinations are used to update predictions for the couplings of massive Cold Dark Matter particles and axions to nucleons. |
hep-ph/9303211 | Christo Christov | Chr.V.Christov, et al | Baryons as solitons in Effective Chiral Quark - Meson Theory | Talk presented at the German-Polish Symposium on Particle and Fields,
28.04 - 1.05, 1992, Rydzyna Castle, Poland,PHYSTEX, 12 pages, (3 figures
available upon request), Preprint RUB-TPII-23/92 | null | null | null | hep-ph | null | The Nambu - Jona-Lasinio model in its SU(2) and SU(3) versions with scalar
and pseudoscalar coupling are applied to baryons. The parameters of the model
are fixed in the meson sector. The baryons arise as a soliton of three valence
quarks coupled to the Dirac sea (quark-antiquarks pairs). Within the SU(2)
version the nucleon static properties as well as some form factors, namely, the
electric and axial ones are described quite successfully. The nucleon-delta
splitting comes out reasonable. In medium the nucleonic soliton gets less
stable -- the mass is reduced whereas the radius increases. At some critical
medium density there is a clear delocalization of the soliton: The nucleon does
not exsist anymore as a soliton. In SU(3) version the strangness carrying
baryons are described as SU(3)-rotational excitations of the SU(2)-soliton
embedded in the SU(3)-sector. The mass splittings between the octet and
decuplet as well as within the multiplets are peproduced not only in a correct
oder but also in a good agreement with the experimantal values.
| [
{
"created": "Wed, 3 Mar 1993 13:04:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Christov",
"Chr. V.",
""
]
] | The Nambu - Jona-Lasinio model in its SU(2) and SU(3) versions with scalar and pseudoscalar coupling are applied to baryons. The parameters of the model are fixed in the meson sector. The baryons arise as a soliton of three valence quarks coupled to the Dirac sea (quark-antiquarks pairs). Within the SU(2) version the nucleon static properties as well as some form factors, namely, the electric and axial ones are described quite successfully. The nucleon-delta splitting comes out reasonable. In medium the nucleonic soliton gets less stable -- the mass is reduced whereas the radius increases. At some critical medium density there is a clear delocalization of the soliton: The nucleon does not exsist anymore as a soliton. In SU(3) version the strangness carrying baryons are described as SU(3)-rotational excitations of the SU(2)-soliton embedded in the SU(3)-sector. The mass splittings between the octet and decuplet as well as within the multiplets are peproduced not only in a correct oder but also in a good agreement with the experimantal values. |
1608.03940 | Chengrong Deng | Chengrong Deng, Jialun Ping, Hongxia Huang, and Fan Wang | Heavy pentaquark states and a novel color structure | 7 pages, 1 figure and 3 tables | Phys. Rev. D 95, 014031 (2017) | 10.1103/PhysRevD.95.014031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Encouraged by the observation of the pentaquark states $P^+_c(4380)$ and
$P^+_c(4450)$, we propose a novel color flux-tube structure, pentagonal state,
for pentaquark states within the framework of color flux-tube mode involving a
five-body confinement potential. Numerical results on the heavy pentaquark
states indicate that the states with three color flux-tube structures, diquark,
octet and pentagonal structures, have the close masses, which can therefore be
called QCD isomers analogous to isomers in Chemistry. The pentagonal structure
has lowest energy. The state $P^+_c(4380)$ can be described as the compact
pentaquark state $uudc\bar{c}$ with the pentagonal structure and
$J^P=\frac{3}{2}^-$ in the color flux-tube model. The state $P^+_c(4450)$ can
not be accommodated into the color flux-tube model. The heavy pentaquark states
$uudc\bar{b}$, $uudb\bar{c}$ and $uudb\bar{b}$ are predicted in the color
flux-tube model. The five-body confinement potential basing on the color
flux-tube picture as a collective degree of freedom is a dynamical mechanism in
the formation of the compact heavy pentaquark states.
| [
{
"created": "Sat, 13 Aug 2016 04:22:32 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2017 09:27:55 GMT",
"version": "v2"
}
] | 2017-02-08 | [
[
"Deng",
"Chengrong",
""
],
[
"Ping",
"Jialun",
""
],
[
"Huang",
"Hongxia",
""
],
[
"Wang",
"Fan",
""
]
] | Encouraged by the observation of the pentaquark states $P^+_c(4380)$ and $P^+_c(4450)$, we propose a novel color flux-tube structure, pentagonal state, for pentaquark states within the framework of color flux-tube mode involving a five-body confinement potential. Numerical results on the heavy pentaquark states indicate that the states with three color flux-tube structures, diquark, octet and pentagonal structures, have the close masses, which can therefore be called QCD isomers analogous to isomers in Chemistry. The pentagonal structure has lowest energy. The state $P^+_c(4380)$ can be described as the compact pentaquark state $uudc\bar{c}$ with the pentagonal structure and $J^P=\frac{3}{2}^-$ in the color flux-tube model. The state $P^+_c(4450)$ can not be accommodated into the color flux-tube model. The heavy pentaquark states $uudc\bar{b}$, $uudb\bar{c}$ and $uudb\bar{b}$ are predicted in the color flux-tube model. The five-body confinement potential basing on the color flux-tube picture as a collective degree of freedom is a dynamical mechanism in the formation of the compact heavy pentaquark states. |
1705.05189 | Peihong Gu | Pei-Hong Gu | Cosmic matter from dark electroweak phase transition with neutrino mass
generation | 5 pages | Phys. Rev. D 96, 055038 (2017) | 10.1103/PhysRevD.96.055038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a dark electroweak phase transition, during which a baryon
asymmetry in the dark neutrons and an equal lepton asymmetry in the dark Dirac
neutrinos can be simultaneously induced by the CP-violating reflection of the
dark fermions off the expanding dark Higgs bubbles. The Yukawa couplings for
generating the ordinary Majorana neutrino masses can partially convert the dark
lepton asymmetry to an ordinary baryon asymmetry in association with the
ordinary sphaleron processes. The dark neutron can have a determined mass to
serve as a dark matter particle. By further imposing a proper mirror symmetry,
the Majorana neutrino mass matrix can have a form of linear seesaw while its
Dirac CP phase can provide a unique source for the required CP violation.
| [
{
"created": "Mon, 15 May 2017 12:44:51 GMT",
"version": "v1"
}
] | 2017-10-04 | [
[
"Gu",
"Pei-Hong",
""
]
] | We consider a dark electroweak phase transition, during which a baryon asymmetry in the dark neutrons and an equal lepton asymmetry in the dark Dirac neutrinos can be simultaneously induced by the CP-violating reflection of the dark fermions off the expanding dark Higgs bubbles. The Yukawa couplings for generating the ordinary Majorana neutrino masses can partially convert the dark lepton asymmetry to an ordinary baryon asymmetry in association with the ordinary sphaleron processes. The dark neutron can have a determined mass to serve as a dark matter particle. By further imposing a proper mirror symmetry, the Majorana neutrino mass matrix can have a form of linear seesaw while its Dirac CP phase can provide a unique source for the required CP violation. |
hep-ph/0007313 | Luca Silvestrini | A. J. Buras, P. Gambino, M. Gorbahn, S. Jager and L. Silvestrini | epsilon'/epsilon and Rare K and B Decays in the MSSM | 44 pages, 7 figures | Nucl.Phys.B592:55-91,2001 | 10.1016/S0550-3213(00)00582-4 | TUM-HEP-382/00 | hep-ph | null | We analyze the CP violating ratio epsilon'/epsilon and rare K and B decays in
the MSSM with minimal flavour and CP violation, including NLO QCD corrections
and imposing constraints on the supersymmetric parameters coming from epsilon,
B_{d,s}^0-\bar B_{d,s}^0 mixings, B to X_s gamma, Delta rho in the electroweak
precision studies and from the lower bound on the neutral Higgs mass. We
provide a compendium of phenomenologically relevant formulae in the MSSM.
Denoting by T(Q) the MSSM prediction for a given quantity normalized to the
Standard Model result we find the ranges: 0.53 < T(epsilon'/epsilon) < 1.07,
0.65 < T(K^+ to pi^+ nu nubar) < 1.02, 0.41 < T(K_L to pi^0 nu nubar) < 1.03,
0.48 < T(K_L to pi^0 e^+ e^-) < 1.10, 0.73 < T(B to X_s nu nubar) < 1.34 and
0.68 < T(B_s to mu^+ mu^-) < 1.53. We point out that these ranges will be
considerably reduced when the lower bounds on the neutral Higgs mass and tan
beta improve. Some contour plots illustrate the dependences of the quantities
above on the relevant supersymmetric parameters. As a byproduct of this work we
update our previous analysis of epsilon'/epsilon in the SM and find in NDR
epsilon'/epsilon = (9.2^{+6.8}_{-4.0}), a value 15 % higher than in our 1999
analysis.
| [
{
"created": "Thu, 27 Jul 2000 15:23:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Buras",
"A. J.",
""
],
[
"Gambino",
"P.",
""
],
[
"Gorbahn",
"M.",
""
],
[
"Jager",
"S.",
""
],
[
"Silvestrini",
"L.",
""
]
] | We analyze the CP violating ratio epsilon'/epsilon and rare K and B decays in the MSSM with minimal flavour and CP violation, including NLO QCD corrections and imposing constraints on the supersymmetric parameters coming from epsilon, B_{d,s}^0-\bar B_{d,s}^0 mixings, B to X_s gamma, Delta rho in the electroweak precision studies and from the lower bound on the neutral Higgs mass. We provide a compendium of phenomenologically relevant formulae in the MSSM. Denoting by T(Q) the MSSM prediction for a given quantity normalized to the Standard Model result we find the ranges: 0.53 < T(epsilon'/epsilon) < 1.07, 0.65 < T(K^+ to pi^+ nu nubar) < 1.02, 0.41 < T(K_L to pi^0 nu nubar) < 1.03, 0.48 < T(K_L to pi^0 e^+ e^-) < 1.10, 0.73 < T(B to X_s nu nubar) < 1.34 and 0.68 < T(B_s to mu^+ mu^-) < 1.53. We point out that these ranges will be considerably reduced when the lower bounds on the neutral Higgs mass and tan beta improve. Some contour plots illustrate the dependences of the quantities above on the relevant supersymmetric parameters. As a byproduct of this work we update our previous analysis of epsilon'/epsilon in the SM and find in NDR epsilon'/epsilon = (9.2^{+6.8}_{-4.0}), a value 15 % higher than in our 1999 analysis. |
1010.1789 | John F. Gunion | John F. Gunion (U.C. Davis) | The Higgs Sector and CoGeNT/DAMA-Like Dark Matter in Supersymmetric
Models | 11 pages, 3 figures. To appear in Proceedings of PASCOS 2010. The
paper is a compilation of talks given at: PASCOS 2010, ORSAY Workshop on
"Higgs Hunting", and SLAC Workshop on "Topologies for Early LHC Searches" | null | 10.1088/1742-6596/259/1/012012 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent data from CoGeNT and DAMA are roughly consistent with a very light
dark matter particle with $m\sim 4-10\gev$ and spin-independent cross section
of order $\sigma_{SI} \sim (1-3)\times 10^{-4}\pb$. An important question is
whether these observations are compatible with supersymmetric models obeying
$\Omega h^2\sim 0.11$ without violating existing collider constraints and
precision measurements. In this talk, I review the fact the the Minimal
Supersymmetric Model allows insufficient flexibility to achieve such
compatibility, basically because of the highly constrained nature of the MSSM
Higgs sector in relation to LEP limits on Higgs bosons. I then outline the
manner in which the more flexible Higgs sectors of the Next-to-Minimal
Supersymmetric Model and an Extended Next-to-Minimal Supersymmetric Model allow
large $\sigma_{SI}$ and $\Omega h^2\sim 0.11$ at low LSP mass without violating
LEP, Tevatron, BaBar and other experimental limits. The relationship of the
required Higgs sectors to the NMSSM "ideal-Higgs" scenarios is discussed.
| [
{
"created": "Fri, 8 Oct 2010 21:36:58 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 2010 18:46:45 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Gunion",
"John F.",
"",
"U.C. Davis"
]
] | Recent data from CoGeNT and DAMA are roughly consistent with a very light dark matter particle with $m\sim 4-10\gev$ and spin-independent cross section of order $\sigma_{SI} \sim (1-3)\times 10^{-4}\pb$. An important question is whether these observations are compatible with supersymmetric models obeying $\Omega h^2\sim 0.11$ without violating existing collider constraints and precision measurements. In this talk, I review the fact the the Minimal Supersymmetric Model allows insufficient flexibility to achieve such compatibility, basically because of the highly constrained nature of the MSSM Higgs sector in relation to LEP limits on Higgs bosons. I then outline the manner in which the more flexible Higgs sectors of the Next-to-Minimal Supersymmetric Model and an Extended Next-to-Minimal Supersymmetric Model allow large $\sigma_{SI}$ and $\Omega h^2\sim 0.11$ at low LSP mass without violating LEP, Tevatron, BaBar and other experimental limits. The relationship of the required Higgs sectors to the NMSSM "ideal-Higgs" scenarios is discussed. |
0803.0809 | Luis Roca | H. Nagahiro, L. Roca, E. Oset | Radiative decay into $\gamma P$ of the low lying axial-vector mesons | null | Phys.Rev.D77:034017,2008 | 10.1103/PhysRevD.77.034017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the radiative decay into a pseudoscalar meson and a photon of the
whole set of the axial-vector mesons dynamically generated from the
vector-pseudoscalar meson ($VP$) interaction. We take into account tree level
and loop diagrams coming from the axial-vector decay into a vector and a
pseudoscalar meson. We find a large span for the values of the radiative widths
of the different axial-vector mesons. In particular, we evaluate the radiative
decay into $K \gamma$ of the two $K_1(1270)$ states, recently claimed
theoretically, and discuss the experimental values quoted so far on the
assumption of only one state.
| [
{
"created": "Thu, 6 Mar 2008 08:10:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nagahiro",
"H.",
""
],
[
"Roca",
"L.",
""
],
[
"Oset",
"E.",
""
]
] | We evaluate the radiative decay into a pseudoscalar meson and a photon of the whole set of the axial-vector mesons dynamically generated from the vector-pseudoscalar meson ($VP$) interaction. We take into account tree level and loop diagrams coming from the axial-vector decay into a vector and a pseudoscalar meson. We find a large span for the values of the radiative widths of the different axial-vector mesons. In particular, we evaluate the radiative decay into $K \gamma$ of the two $K_1(1270)$ states, recently claimed theoretically, and discuss the experimental values quoted so far on the assumption of only one state. |
1504.04381 | Shufang Su | Tong Li (Monash University), Shufang Su (University of Arizona) | Exotic Higgs Decay via Charged Higgs | 19 pages, 11 figures, version appear in JHEP | null | 10.1007/JHEP11(2015)068 | COEPP-MN-15-3 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most common search channel for heavy neutral Higgses in models with an
extension of the Standard Model Higgs sector is $A/H^0\rightarrow \tau\tau$,
which becomes ineffective when new decay modes of $A/H^0$ open. In this paper,
we analyzed two such channels involving charged Higgses in the final states:
$A/H^0 \rightarrow W^\pm H^\mp$ and $H^0 \rightarrow H^+H^-$. With the
consequent decay of $H^\pm\rightarrow \tau\nu$, we found that the limits for
$\sigma\times{BR}(gg \rightarrow A/H^0 \rightarrow W^\pm H^\mp)\times
{BR}(H^\pm \rightarrow \tau \nu)$ vary from 30 to 10 fb for $m_{A/H^0}$ between
300 and 1000 GeV for 95% C.L. exclusion, and about 80 to 30 fb for 5$\sigma$
discovery. For $H^+H^-$ mode, 95% C.L. limits on $\sigma\times {BR}(gg\to
H^0\to H^+ H^-)\times {BR}^2(H^\pm\to \tau\nu)$ vary from 9 to 4 fb for
$m_{H^0}$ between 400 and 1000 GeV, while the 5$\sigma$ reach is about 20 to 10
fb. We further interpret the cross section limits in the Type II 2HDM parameter
space. While $A\rightarrow W^\pm H^\mp$ offers great sensitivity in both
$\sin(\beta-\alpha)$ versus $\tan\beta$ and $m_A$ versus $\tan\beta$ parameter
space, $H^0\rightarrow H^+ H^-$ can cover most of the parameter space for
$H^0$. Reach in $H^0\rightarrow W^\pm H^\mp$ is more limited, especially for
$m_{H^0}>2 m_{H^\pm}$. It is, however, complementary to $H^0\rightarrow H^+
H^-$ when ${BR}(H^0\rightarrow H^+ H^-)$ is accidentally suppressed.
| [
{
"created": "Thu, 16 Apr 2015 20:01:36 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2016 15:50:13 GMT",
"version": "v2"
}
] | 2016-01-20 | [
[
"Li",
"Tong",
"",
"Monash University"
],
[
"Su",
"Shufang",
"",
"University of Arizona"
]
] | The most common search channel for heavy neutral Higgses in models with an extension of the Standard Model Higgs sector is $A/H^0\rightarrow \tau\tau$, which becomes ineffective when new decay modes of $A/H^0$ open. In this paper, we analyzed two such channels involving charged Higgses in the final states: $A/H^0 \rightarrow W^\pm H^\mp$ and $H^0 \rightarrow H^+H^-$. With the consequent decay of $H^\pm\rightarrow \tau\nu$, we found that the limits for $\sigma\times{BR}(gg \rightarrow A/H^0 \rightarrow W^\pm H^\mp)\times {BR}(H^\pm \rightarrow \tau \nu)$ vary from 30 to 10 fb for $m_{A/H^0}$ between 300 and 1000 GeV for 95% C.L. exclusion, and about 80 to 30 fb for 5$\sigma$ discovery. For $H^+H^-$ mode, 95% C.L. limits on $\sigma\times {BR}(gg\to H^0\to H^+ H^-)\times {BR}^2(H^\pm\to \tau\nu)$ vary from 9 to 4 fb for $m_{H^0}$ between 400 and 1000 GeV, while the 5$\sigma$ reach is about 20 to 10 fb. We further interpret the cross section limits in the Type II 2HDM parameter space. While $A\rightarrow W^\pm H^\mp$ offers great sensitivity in both $\sin(\beta-\alpha)$ versus $\tan\beta$ and $m_A$ versus $\tan\beta$ parameter space, $H^0\rightarrow H^+ H^-$ can cover most of the parameter space for $H^0$. Reach in $H^0\rightarrow W^\pm H^\mp$ is more limited, especially for $m_{H^0}>2 m_{H^\pm}$. It is, however, complementary to $H^0\rightarrow H^+ H^-$ when ${BR}(H^0\rightarrow H^+ H^-)$ is accidentally suppressed. |
hep-ph/0412104 | Enrico Nardi | Enrico Nardi (INFN Frascati and Antioquia U.) and Jorge I. Zuluaga
(Antioquia U.) | Constraints on neutrino masses from a Galactic supernova neutrino signal
at present and future detectors | 28 pages, 5 Figures, added discussion on systematic errors and some
clarifications. Results unchanged. Published version | Nucl.Phys. B731 (2005) 140-163 | 10.1016/j.nuclphysb.2005.10.009 | null | hep-ph astro-ph | null | We study the constraints on neutrino masses that could be derived from the
observation of a Galactic supernova neutrino signal with present and future
neutrino detectors. Our analysis is based on a recently proposed method that
uses the full statistics of neutrino events and does not depend on particular
astrophysical assumptions. The statistical approach, originally justified
mainly in terms of intuitive reasoning, is put on a more solid basis by means
of Bayesian inference reasoning. Theoretical uncertainties in the neutrino
signal time profiles are estimated by applying the method to two widely
different supernova models. Present detectors can reach a sensitivity down to 1
eV. This is better than limits from tritium $\beta$-decay experiments,
competitive with the most conservative results from neutrinoless double
$\beta$-decay, less precise but less dependent from prior assumptions than
cosmological bounds. Future megaton water Cerencov detectors will allow for
about a factor of two improvement. However, they will not be competitive with
the next generation of laboratory experiments.
| [
{
"created": "Wed, 8 Dec 2004 02:35:31 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jan 2006 17:00:02 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Nardi",
"Enrico",
"",
"INFN Frascati and Antioquia U."
],
[
"Zuluaga",
"Jorge I.",
"",
"Antioquia U."
]
] | We study the constraints on neutrino masses that could be derived from the observation of a Galactic supernova neutrino signal with present and future neutrino detectors. Our analysis is based on a recently proposed method that uses the full statistics of neutrino events and does not depend on particular astrophysical assumptions. The statistical approach, originally justified mainly in terms of intuitive reasoning, is put on a more solid basis by means of Bayesian inference reasoning. Theoretical uncertainties in the neutrino signal time profiles are estimated by applying the method to two widely different supernova models. Present detectors can reach a sensitivity down to 1 eV. This is better than limits from tritium $\beta$-decay experiments, competitive with the most conservative results from neutrinoless double $\beta$-decay, less precise but less dependent from prior assumptions than cosmological bounds. Future megaton water Cerencov detectors will allow for about a factor of two improvement. However, they will not be competitive with the next generation of laboratory experiments. |
1208.1765 | Matthew Reece | Matthew Reece | Vacuum Instabilities with a Wrong-Sign Higgs-Gluon-Gluon Amplitude | 20 pages, 8 figures; v2: references added | null | 10.1088/1367-2630/15/4/043003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently discovered 125 GeV boson appears very similar to a Standard
Model Higgs, but with data favoring an enhanced h to gamma gamma rate. A number
of groups have found that fits would allow (or, less so after the latest
updates, prefer) that the h-t-tbar coupling have the opposite sign. This can be
given meaning in the context of an electroweak chiral Lagrangian, but it might
also be interpreted to mean that a new colored and charged particle runs in
loops and produces the opposite-sign hGG amplitude to that generated by
integrating out the top, as well as a contribution reinforcing the W-loop
contribution to hFF. In order to not suppress the rate of h to WW and h to ZZ,
which appear to be approximately Standard Model-like, one would need the loop
to "overshoot," not only canceling the top contribution but producing an
opposite-sign hGG vertex of about the same magnitude as that in the SM. We
argue that most such explanations have severe problems with fine-tuning and,
more importantly, vacuum stability. In particular, the case of stop loops
producing an opposite-sign hGG vertex of the same size as the Standard Model
one is ruled out by a combination of vacuum decay bounds and LEP constraints.
We also show that scenarios with a sign flip from loops of color octet charged
scalars or new fermionic states are highly constrained.
| [
{
"created": "Wed, 8 Aug 2012 20:00:09 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2012 01:43:14 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Reece",
"Matthew",
""
]
] | The recently discovered 125 GeV boson appears very similar to a Standard Model Higgs, but with data favoring an enhanced h to gamma gamma rate. A number of groups have found that fits would allow (or, less so after the latest updates, prefer) that the h-t-tbar coupling have the opposite sign. This can be given meaning in the context of an electroweak chiral Lagrangian, but it might also be interpreted to mean that a new colored and charged particle runs in loops and produces the opposite-sign hGG amplitude to that generated by integrating out the top, as well as a contribution reinforcing the W-loop contribution to hFF. In order to not suppress the rate of h to WW and h to ZZ, which appear to be approximately Standard Model-like, one would need the loop to "overshoot," not only canceling the top contribution but producing an opposite-sign hGG vertex of about the same magnitude as that in the SM. We argue that most such explanations have severe problems with fine-tuning and, more importantly, vacuum stability. In particular, the case of stop loops producing an opposite-sign hGG vertex of the same size as the Standard Model one is ruled out by a combination of vacuum decay bounds and LEP constraints. We also show that scenarios with a sign flip from loops of color octet charged scalars or new fermionic states are highly constrained. |
2203.01639 | Clara Lavinia Del Pio | E. Budassi, C. M. Carloni Calame, C. L. Del Pio and F. Piccinini | Single $\pi^0$ production in $\mu e$ scattering at MUonE | 9 pages, 11 figures | null | 10.1016/j.physletb.2022.137138 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently proposed MUonE experiment at CERN aims at providing a novel
determination of the leading order hadronic contribution to the muon anomalous
magnetic moment through the study of elastic muon-electron scattering at
relatively small momentum transfer. The anticipated accuracy of the order of
10ppm demands for high-precision prediction in radiative corrections to the
$\mu e$ scattering as well as for robust quantitative estimates of all possible
background processes. In this letter, the contribution due to the emission of a
neutral pion through the process $\mu e \to \mu e \pi^0$ is studied and its
numerical impact is discussed in different phase space configurations by means
of the upgraded Monte Carlo event generator MESMER. In fact, single $\pi^0$
production could be a source of reducible background for the measurement of the
QED running coupling constant at MUonE and it could be also an important
background for possible New Physics searches at MUonE involving $2 \to 3$
processes, in phase space regions complementary to the ones characteristic of
the elastic $\mu e$ scattering.
| [
{
"created": "Thu, 3 Mar 2022 10:59:37 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Budassi",
"E.",
""
],
[
"Calame",
"C. M. Carloni",
""
],
[
"Del Pio",
"C. L.",
""
],
[
"Piccinini",
"F.",
""
]
] | The recently proposed MUonE experiment at CERN aims at providing a novel determination of the leading order hadronic contribution to the muon anomalous magnetic moment through the study of elastic muon-electron scattering at relatively small momentum transfer. The anticipated accuracy of the order of 10ppm demands for high-precision prediction in radiative corrections to the $\mu e$ scattering as well as for robust quantitative estimates of all possible background processes. In this letter, the contribution due to the emission of a neutral pion through the process $\mu e \to \mu e \pi^0$ is studied and its numerical impact is discussed in different phase space configurations by means of the upgraded Monte Carlo event generator MESMER. In fact, single $\pi^0$ production could be a source of reducible background for the measurement of the QED running coupling constant at MUonE and it could be also an important background for possible New Physics searches at MUonE involving $2 \to 3$ processes, in phase space regions complementary to the ones characteristic of the elastic $\mu e$ scattering. |
1410.0921 | Nils-Erik Bomark | N.-E. Bomark, A. Kvellestad, S. Lola, P. Osland and A.R. Raklev | R-parity violating chargino decays at the LHC | Version published in JHEP | JHEP 1412 (2014) 121 | 10.1007/JHEP12(2014)121 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric models with R-parity violation (RPV) have become more popular
following the lack of any excess of missing energy events at the 8 TeV LHC. To
identify such models, the suggested searches generally rely on the decay
products of the (effectively) lightest supersymmetric particle (LSP), with
signals that depend on the identity of the LSP and the relevant RPV operators.
Here we look at the prospects for detecting RPV chargino decays at the LHC and
find substantial patches of parameter space in the Minimal Supersymmetric
Standard Model with possibly spectacular signatures, such as three
charged-lepton resonances.
| [
{
"created": "Fri, 3 Oct 2014 17:31:03 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2015 12:43:41 GMT",
"version": "v2"
}
] | 2015-01-12 | [
[
"Bomark",
"N. -E.",
""
],
[
"Kvellestad",
"A.",
""
],
[
"Lola",
"S.",
""
],
[
"Osland",
"P.",
""
],
[
"Raklev",
"A. R.",
""
]
] | Supersymmetric models with R-parity violation (RPV) have become more popular following the lack of any excess of missing energy events at the 8 TeV LHC. To identify such models, the suggested searches generally rely on the decay products of the (effectively) lightest supersymmetric particle (LSP), with signals that depend on the identity of the LSP and the relevant RPV operators. Here we look at the prospects for detecting RPV chargino decays at the LHC and find substantial patches of parameter space in the Minimal Supersymmetric Standard Model with possibly spectacular signatures, such as three charged-lepton resonances. |
1401.7431 | Michael Lublinsky | Tolga Altinoluk, Alex Kovner, Eugene Levin, and Michael Lublinsky | Reggeon Field Theory for Large Pomeron Loops | 38 pages, 4 figures | null | 10.1007/JHEP04(2014)075 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the range of applicability of the high energy Reggeon Field Theory
$H_{RFT}$ derived in [1]. We show that this theory is valid as long as at any
intermediate value of rapidity $\eta$ throughout the evolution at least one of
the colliding objects is dilute. Importantly, at some values of $\eta$ the
dilute object could be the projectile, while at others it could be the target,
so that $H_{RFT}$ does not reduce to either $H_{JIMWLK}$ or $H_{KLWMIJ}$. When
both objects are dense, corrections to the evolution not accounted for in [1]
become important. The same limitation applies to other approaches to high
energy evolution available today, such as for example [3] and [4]. We also show
that, in its regime of applicability $H_{RFT}$ can be simplified. We derive the
simpler version of $H_{RFT}$ and in the large $N_c$ limit rewrite it in terms
of the Reggeon creation and annihilation operators. The resulting $H_{RFT}$ is
explicitly self dual and provides the generalization of the Pomeron calculus
developed in [4] by including higher Reggeons in the evolution. It is
applicable for description of `large' Pomeron loops, namely Reggeon graphs
where all the splittings occur close in rapidity to one dilute object
(projectile), while all the merging close to the other one (target).
Additionally we derive, in the same regime expressions for single and double
inclusive gluon production (where the gluons are not separated by a large
rapidity interval) in terms of the Reggeon degrees of freedom.
| [
{
"created": "Wed, 29 Jan 2014 08:28:44 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Kovner",
"Alex",
""
],
[
"Levin",
"Eugene",
""
],
[
"Lublinsky",
"Michael",
""
]
] | We analyze the range of applicability of the high energy Reggeon Field Theory $H_{RFT}$ derived in [1]. We show that this theory is valid as long as at any intermediate value of rapidity $\eta$ throughout the evolution at least one of the colliding objects is dilute. Importantly, at some values of $\eta$ the dilute object could be the projectile, while at others it could be the target, so that $H_{RFT}$ does not reduce to either $H_{JIMWLK}$ or $H_{KLWMIJ}$. When both objects are dense, corrections to the evolution not accounted for in [1] become important. The same limitation applies to other approaches to high energy evolution available today, such as for example [3] and [4]. We also show that, in its regime of applicability $H_{RFT}$ can be simplified. We derive the simpler version of $H_{RFT}$ and in the large $N_c$ limit rewrite it in terms of the Reggeon creation and annihilation operators. The resulting $H_{RFT}$ is explicitly self dual and provides the generalization of the Pomeron calculus developed in [4] by including higher Reggeons in the evolution. It is applicable for description of `large' Pomeron loops, namely Reggeon graphs where all the splittings occur close in rapidity to one dilute object (projectile), while all the merging close to the other one (target). Additionally we derive, in the same regime expressions for single and double inclusive gluon production (where the gluons are not separated by a large rapidity interval) in terms of the Reggeon degrees of freedom. |
1509.03392 | Keigo Sumita | Keigo Sumita | Quasi-localized wavefunctions on magnetized tori and tiny neutrino
Yukawa couplings | 10 pages, 2 figures | null | 10.1007/JHEP01(2016)067 | WU-HEP-15-18 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper shows that, a quasi-localization of wavefunctions in toroidal
compactifications with magnetic fluxes can lead to a strong suppression for
relevant Yukawa couplings, and it is applicable to obtain tiny neutrino masses.
Although it is known that magnetic fluxes lead to a Gaussian profile of
zero-modes on a torus and that can yield a suppressed coupling in
higher-dimensional supersymmetric Yang-Mills (SYM) theories, the largest
(diagonal) entry of Yukawa matrices is always of $\mathcal O(1)$. In this
paper, we propose a way to induce an absolutely tiny global factor of Yukawa
matrices. In two SYM theories defined in different dimensional spacetime, their
bifundamental representations must be localized as a point in some directions.
Overlaps of such point-like localized wavefunctions and Gaussian zero-modes
give a global factor of Yukawa matrices, and it can be a strong suppression
factor or a usual $\mathcal O(1)$ factor, corresponding to their distance. Our
numerical analysis shows that it is possible to obtain a suppression strong
enough to realize the tiny neutrino masses without a hard fine-tuning.
Furthermore, we propose a concrete model of the tiny neutrino Yukawa couplings
in a magnetized SYM system.
| [
{
"created": "Fri, 11 Sep 2015 05:43:41 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Sumita",
"Keigo",
""
]
] | This paper shows that, a quasi-localization of wavefunctions in toroidal compactifications with magnetic fluxes can lead to a strong suppression for relevant Yukawa couplings, and it is applicable to obtain tiny neutrino masses. Although it is known that magnetic fluxes lead to a Gaussian profile of zero-modes on a torus and that can yield a suppressed coupling in higher-dimensional supersymmetric Yang-Mills (SYM) theories, the largest (diagonal) entry of Yukawa matrices is always of $\mathcal O(1)$. In this paper, we propose a way to induce an absolutely tiny global factor of Yukawa matrices. In two SYM theories defined in different dimensional spacetime, their bifundamental representations must be localized as a point in some directions. Overlaps of such point-like localized wavefunctions and Gaussian zero-modes give a global factor of Yukawa matrices, and it can be a strong suppression factor or a usual $\mathcal O(1)$ factor, corresponding to their distance. Our numerical analysis shows that it is possible to obtain a suppression strong enough to realize the tiny neutrino masses without a hard fine-tuning. Furthermore, we propose a concrete model of the tiny neutrino Yukawa couplings in a magnetized SYM system. |
1811.00187 | Hungchong Kim | Hungchong Kim, K. S. Kim, Myung-Ki Cheoun, Daisuke Jido, Makoto Oka | Further signatures to support the tetraquark mixing framework for the
two light-meson nonets | 15 pages, 2 figures, revised slighltly, version accepted for
publication in PRD | Phys. Rev. D 99, 014005 (2019) | 10.1103/PhysRevD.99.014005 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate additional signatures to support the tetraquark
mixing framework that has been recently proposed as a possible structure for
the two nonets, namely $a_0 (980)$, $K_0^* (800)$, $f_0 (500)$, $f_0 (980)$ in
the light nonet, $a_0 (1450)$, $K_0^* (1430)$, $f_0 (1370)$, $f_0 (1500)$ in
the heavy nonet. First, we advocate that the two nonets form the flavor nonet
approximately satisfying the Gell-Mann--Okubo mass relation. Then we reexamine
the mass ordering generated from the tetraquark nonets and show that this mass
ordering is satisfied by the two nonets although the ordering in the heavy
nonet is marginal. The marginal mass ordering however can be regarded as
another signature for tetraquarks because it can be explained partially by the
hyperfine masses calculated from the tetraquark mixing framework. The
tetraquark mixing parameters are found to be independent of isospins giving
additional support for the formation of the flavor nonets. In addition, we
discuss the other approaches like two-quark pictures or meson-meson bound
states, and their possible limitations in explaining the two nonets. As a
peculiar signature distinguished from other approaches, we investigate the
fall-apart coupling strengths into two vector mesons from our tetraquarks.
Coupling strengths into the two-vector modes are found to enhance strongly in
the heavy nonet while they are suppressed in the light nonet. The coupling
ratios, which depend on the isospin channel, are found to be huge around $\sim
15$. This trend in the two-vector modes, which is opposite to that in the
two-pseudoscalar fall-apart modes, can provide another testing ground for the
tetraquark mixing framework. Some experimental evidences related to the
phenomena are discussed particularly from the resonances belonging to the heavy
nonet.
| [
{
"created": "Thu, 1 Nov 2018 02:18:55 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2018 22:48:36 GMT",
"version": "v2"
}
] | 2019-01-09 | [
[
"Kim",
"Hungchong",
""
],
[
"Kim",
"K. S.",
""
],
[
"Cheoun",
"Myung-Ki",
""
],
[
"Jido",
"Daisuke",
""
],
[
"Oka",
"Makoto",
""
]
] | In this work, we investigate additional signatures to support the tetraquark mixing framework that has been recently proposed as a possible structure for the two nonets, namely $a_0 (980)$, $K_0^* (800)$, $f_0 (500)$, $f_0 (980)$ in the light nonet, $a_0 (1450)$, $K_0^* (1430)$, $f_0 (1370)$, $f_0 (1500)$ in the heavy nonet. First, we advocate that the two nonets form the flavor nonet approximately satisfying the Gell-Mann--Okubo mass relation. Then we reexamine the mass ordering generated from the tetraquark nonets and show that this mass ordering is satisfied by the two nonets although the ordering in the heavy nonet is marginal. The marginal mass ordering however can be regarded as another signature for tetraquarks because it can be explained partially by the hyperfine masses calculated from the tetraquark mixing framework. The tetraquark mixing parameters are found to be independent of isospins giving additional support for the formation of the flavor nonets. In addition, we discuss the other approaches like two-quark pictures or meson-meson bound states, and their possible limitations in explaining the two nonets. As a peculiar signature distinguished from other approaches, we investigate the fall-apart coupling strengths into two vector mesons from our tetraquarks. Coupling strengths into the two-vector modes are found to enhance strongly in the heavy nonet while they are suppressed in the light nonet. The coupling ratios, which depend on the isospin channel, are found to be huge around $\sim 15$. This trend in the two-vector modes, which is opposite to that in the two-pseudoscalar fall-apart modes, can provide another testing ground for the tetraquark mixing framework. Some experimental evidences related to the phenomena are discussed particularly from the resonances belonging to the heavy nonet. |
0801.1645 | Eduardo Pont\'on | Giuliano Panico, Eduardo Ponton, Jose Santiago and Marco Serone | Dark Matter and Electroweak Symmetry Breaking in Models with Warped
Extra Dimensions | 39 pages, 6 figures. v3: References added and typos corrected.
Published version. v4: Reference corrected | Phys.Rev.D77:115012,2008 | 10.1103/PhysRevD.77.115012 | null | hep-ph astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a discrete exchange symmetry can give rise to realistic dark
matter candidates in models with warped extra dimensions. We show how to
realize our construction in a variety of models with warped extra dimensions
and study in detail a realistic model of Gauge-Higgs Unification/composite
Higgs in which the observed amount of dark matter is naturally reproduced. In
this model, a realistic pattern of electroweak symmetry breaking typically
occurs in a region of parameter space in which the fit to the electroweak
precision observables improves, the Higgs is heavier than the experimental
bound and new light quark resonances are predicted. We also quantify the
fine-tuning of such scenarios, and discuss in which sense Gauge-Higgs
Unification models result in a natural theory of electroweak symmetry breaking.
| [
{
"created": "Thu, 10 Jan 2008 18:01:55 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2008 19:01:54 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Jun 2008 10:36:36 GMT",
"version": "v3"
},
{
"created": "Tue, 17 Jun 2008 08:00:14 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Panico",
"Giuliano",
""
],
[
"Ponton",
"Eduardo",
""
],
[
"Santiago",
"Jose",
""
],
[
"Serone",
"Marco",
""
]
] | We show that a discrete exchange symmetry can give rise to realistic dark matter candidates in models with warped extra dimensions. We show how to realize our construction in a variety of models with warped extra dimensions and study in detail a realistic model of Gauge-Higgs Unification/composite Higgs in which the observed amount of dark matter is naturally reproduced. In this model, a realistic pattern of electroweak symmetry breaking typically occurs in a region of parameter space in which the fit to the electroweak precision observables improves, the Higgs is heavier than the experimental bound and new light quark resonances are predicted. We also quantify the fine-tuning of such scenarios, and discuss in which sense Gauge-Higgs Unification models result in a natural theory of electroweak symmetry breaking. |
2209.07094 | Shu-Min Zhao | Shu-Min Zhao, Xi Wang, Xing-Xing Dong, Hai-Bin Zhang, Tai-Fu Feng | Study the Higgs mass with the effective potential and Higgs decays in
the $U(1)_X$SSM | 19 pages, 11 figures | Symmetry 2022, 14, 2153 | 10.3390/sym14102153 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As the U(1) extension of the minimal supersymmetric standard model, the
$U(1)_X$SSM has new super fields such as right-handed neutrinos and three Higgs
singlets. In the $U(1)_X$SSM, the lightest CP-even Higgs mass $m_{h^0}$ is
researched through the Higgs effective potential with one loop corrections. We
also calculate the Higgs decays $h^0\rightarrow\gamma\gamma$, $h^0\rightarrow
VV~(V=W,~Z)$, $h^0\rightarrow l\bar{l}Z$ and $h^0\rightarrow \nu\bar{\nu}Z$.
The obtained results are reasonable, which are in favour of the study of the
Higgs characteristic and the phenomenology of the $U(1)_X$SSM.
| [
{
"created": "Thu, 15 Sep 2022 07:18:12 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Oct 2022 06:28:51 GMT",
"version": "v2"
}
] | 2022-11-22 | [
[
"Zhao",
"Shu-Min",
""
],
[
"Wang",
"Xi",
""
],
[
"Dong",
"Xing-Xing",
""
],
[
"Zhang",
"Hai-Bin",
""
],
[
"Feng",
"Tai-Fu",
""
]
] | As the U(1) extension of the minimal supersymmetric standard model, the $U(1)_X$SSM has new super fields such as right-handed neutrinos and three Higgs singlets. In the $U(1)_X$SSM, the lightest CP-even Higgs mass $m_{h^0}$ is researched through the Higgs effective potential with one loop corrections. We also calculate the Higgs decays $h^0\rightarrow\gamma\gamma$, $h^0\rightarrow VV~(V=W,~Z)$, $h^0\rightarrow l\bar{l}Z$ and $h^0\rightarrow \nu\bar{\nu}Z$. The obtained results are reasonable, which are in favour of the study of the Higgs characteristic and the phenomenology of the $U(1)_X$SSM. |
2008.01088 | Kevin Kelly | Sebastian A. R. Ellis, Kevin J. Kelly, Shirley Weishi Li | Current and Future Neutrino Oscillation Constraints on Leptonic
Unitarity | 50 pages, 18 figures. Comments are welcome. Minor changes, rearranged
order of results. Matches version published in JHEP | JHEP12 (2020) 068 | 10.1007/JHEP12(2020)068 | FERMILAB-PUB-20-364-T, SLAC-PUB-17552 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The unitarity of the lepton mixing matrix is a critical assumption underlying
the standard neutrino-mixing paradigm. However, many models seeking to explain
the as-yet-unknown origin of neutrino masses predict deviations from unitarity
in the mixing of the active neutrino states. Motivated by the prospect that
future experiments may provide a precise measurement of the lepton mixing
matrix, we revisit current constraints on unitarity violation from oscillation
measurements and project how next-generation experiments will improve our
current knowledge. With the next-generation data, the normalizations of all
rows and columns of the lepton mixing matrix will be constrained to
$\lesssim$10\% precision, with the $e$-row best measured at $\lesssim$1\% and
the $\tau$-row worst measured at ${\sim}10\%$ precision. The measurements of
the mixing matrix elements themselves will be improved on average by a factor
of $3$. We highlight the complementarity of DUNE, T2HK, JUNO, and IceCube
Upgrade for these improvements, as well as the importance of $\nu_\tau$
appearance measurements and sterile neutrino searches for tests of leptonic
unitarity.
| [
{
"created": "Mon, 3 Aug 2020 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Aug 2020 19:49:26 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Dec 2020 21:25:58 GMT",
"version": "v3"
}
] | 2020-12-16 | [
[
"Ellis",
"Sebastian A. R.",
""
],
[
"Kelly",
"Kevin J.",
""
],
[
"Li",
"Shirley Weishi",
""
]
] | The unitarity of the lepton mixing matrix is a critical assumption underlying the standard neutrino-mixing paradigm. However, many models seeking to explain the as-yet-unknown origin of neutrino masses predict deviations from unitarity in the mixing of the active neutrino states. Motivated by the prospect that future experiments may provide a precise measurement of the lepton mixing matrix, we revisit current constraints on unitarity violation from oscillation measurements and project how next-generation experiments will improve our current knowledge. With the next-generation data, the normalizations of all rows and columns of the lepton mixing matrix will be constrained to $\lesssim$10\% precision, with the $e$-row best measured at $\lesssim$1\% and the $\tau$-row worst measured at ${\sim}10\%$ precision. The measurements of the mixing matrix elements themselves will be improved on average by a factor of $3$. We highlight the complementarity of DUNE, T2HK, JUNO, and IceCube Upgrade for these improvements, as well as the importance of $\nu_\tau$ appearance measurements and sterile neutrino searches for tests of leptonic unitarity. |
0707.0781 | Evgeny Komarov | E.V.Komarov, Yu.A.Simonov | Nonperturbative equation of state of quark-gluon plasma. Applications | 20 pages, 6 figures | AnnalsPhys.323:783-811,2008; AnnalsPhys.323:1230-1246,2008 | 10.1016/j.aop.2007.05.007 10.1016/j.aop.2007.07.005 | null | hep-ph | null | The vacuum-driven nonperturbative factors $L_i$ for quark and gluon Green's
functions are shown to define the nonperturbative dynamics of QGP in the
leading approximation. EoS obtained recently in the framework of this approach
is compared in detail with known lattice data for $\mu=0$ including $P/T^4$,
$\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$. The basic role in the dynamics at
$T\la 3T_c$ is played by the factors $L_i$ which are approximately equal to the
modulus of Polyakov line for quark $L_{fund}$ and gluon $L_{adj}$. The
properties of $L_i$ are derived from field correlators and compared to lattice
data, in particular the Casimir scaling property $L_{adj}
=(L_{fund})^{\frac{C_2(adj)}{C_2(fund)}}$ follows in the Gaussian approximation
valid for small vacuum correlation lengths. Resulting curves for $P/T^4$,
$\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$ are in a reasonable agreement with
lattice data, the remaining difference points out to an effective attraction
among QGP constituents.
| [
{
"created": "Thu, 5 Jul 2007 13:57:09 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2007 14:17:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Komarov",
"E. V.",
""
],
[
"Simonov",
"Yu. A.",
""
]
] | The vacuum-driven nonperturbative factors $L_i$ for quark and gluon Green's functions are shown to define the nonperturbative dynamics of QGP in the leading approximation. EoS obtained recently in the framework of this approach is compared in detail with known lattice data for $\mu=0$ including $P/T^4$, $\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$. The basic role in the dynamics at $T\la 3T_c$ is played by the factors $L_i$ which are approximately equal to the modulus of Polyakov line for quark $L_{fund}$ and gluon $L_{adj}$. The properties of $L_i$ are derived from field correlators and compared to lattice data, in particular the Casimir scaling property $L_{adj} =(L_{fund})^{\frac{C_2(adj)}{C_2(fund)}}$ follows in the Gaussian approximation valid for small vacuum correlation lengths. Resulting curves for $P/T^4$, $\epsilon/T^4$, $\frac{\epsilon-3P}{T^4}$ are in a reasonable agreement with lattice data, the remaining difference points out to an effective attraction among QGP constituents. |
1204.2383 | Maozhi Yang | Ji-Chong Yang and Mao-Zhi Yang | Radiative Leptonic Decays of the charged $B$ and $D$ Mesons Including
Long-Distance Contribution | 8 pages, 4 figures, 3 tables | null | 10.1142/S0217732312501209 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the radiative leptonic decays of $B^-$, $D^-$ and
$D_s^-\to \gamma l \bar{\nu}$, including both the short-distance and
long-distance contributions. The short-distance contribution is calculated by
using the relativistic quark model, where the bound state wave function we used
is that obtained in the relativistic potential model. The long-distance
contribution is estimated by using vector meson dominance model.
| [
{
"created": "Wed, 11 Apr 2012 09:25:31 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Yang",
"Ji-Chong",
""
],
[
"Yang",
"Mao-Zhi",
""
]
] | In this work we study the radiative leptonic decays of $B^-$, $D^-$ and $D_s^-\to \gamma l \bar{\nu}$, including both the short-distance and long-distance contributions. The short-distance contribution is calculated by using the relativistic quark model, where the bound state wave function we used is that obtained in the relativistic potential model. The long-distance contribution is estimated by using vector meson dominance model. |
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