id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2005.02320 | Charles Hughes | Charles Hughes, Antonio Carlos Oliveira Da Silva, and Christine
Nattrass | Model studies of fluctuations in the background for jets in heavy ion
collisions | null | Phys. Rev. C 106, 2022, 044915 | 10.1103/PhysRevC.106.044915 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Jets produced in high energy heavy ion collisions are quenched by the quark
gluon plasma. Measurements of these jets are influenced by the methods used to
suppress and subtract the large, fluctuating background and the assumptions
inherent in these methods. We compare the measurements of the background in
Pb+Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV by the ALICE Collaboration
$\underline{(B. Abelev \textit{et al.}, J. High Energy Phys. \mathbf{2012},
053)}$ to calculations in TennGen (a data-driven random background generator)
and PYTHIA Angantyr. A detailed understanding of the width of these
fluctuations is important for reducing uncertainties due to unfolding and
extending measurements to lower momenta and larger resolution parameters. The
standard deviation of the energy in random cones in TennGen is approximately in
agreement with the form predicted in the ALICE paper, with deviations of 1--6%.
The standard deviation of energy in random cones in Angantyr exceeds the same
predictions by approximately 13%. Deviations in both models can be explained by
the assumption that the single-particle $d^2N/dy$ $dp_T$ is a gamma
distribution in the derivation of the prediction, whereas the model uses a
different distribution. This indicates that model comparisons are potentially
sensitive to the treatment of the background. We demonstrate that unfolding
methods used to remove background fluctuations from jets can affect the
comparisons between models and data, $\textit{even in the absence of detector
effects}$. Our findings suggest the need to more carefully consider methods for
comparing simulations and data.
| [
{
"created": "Tue, 5 May 2020 16:24:30 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 19:15:58 GMT",
"version": "v2"
}
] | 2022-11-03 | [
[
"Hughes",
"Charles",
""
],
[
"Da Silva",
"Antonio Carlos Oliveira",
""
],
[
"Nattrass",
"Christine",
""
]
] | Jets produced in high energy heavy ion collisions are quenched by the quark gluon plasma. Measurements of these jets are influenced by the methods used to suppress and subtract the large, fluctuating background and the assumptions inherent in these methods. We compare the measurements of the background in Pb+Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV by the ALICE Collaboration $\underline{(B. Abelev \textit{et al.}, J. High Energy Phys. \mathbf{2012}, 053)}$ to calculations in TennGen (a data-driven random background generator) and PYTHIA Angantyr. A detailed understanding of the width of these fluctuations is important for reducing uncertainties due to unfolding and extending measurements to lower momenta and larger resolution parameters. The standard deviation of the energy in random cones in TennGen is approximately in agreement with the form predicted in the ALICE paper, with deviations of 1--6%. The standard deviation of energy in random cones in Angantyr exceeds the same predictions by approximately 13%. Deviations in both models can be explained by the assumption that the single-particle $d^2N/dy$ $dp_T$ is a gamma distribution in the derivation of the prediction, whereas the model uses a different distribution. This indicates that model comparisons are potentially sensitive to the treatment of the background. We demonstrate that unfolding methods used to remove background fluctuations from jets can affect the comparisons between models and data, $\textit{even in the absence of detector effects}$. Our findings suggest the need to more carefully consider methods for comparing simulations and data. |
1503.09063 | Danny van Dyk | Thorsten Feldmann, Bastian M\"uller and Danny van Dyk (Siegen U.) | Analyzing $b\to u$ transitions in semileptonic $\bar{B}_s \to K^{*+}(\to
K \pi)\ell^-\bar\nu_\ell$ decays | 14 pages, 2 figures | Phys. Rev. D 92, 034013 (2015) | 10.1103/PhysRevD.92.034013 | SI-HEP-2015-11, QFET-2015-12, EOS-2015-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the semileptonic decay $\bar{B}_s \to K^{*+} \ell^-\bar\nu_\ell$,
which is induced by $b\to u \ell^- \bar\nu_\ell$ transitions at the quark
level. We take into account the standard model (SM) operator from $W$-boson
exchange as well as possible extensions from physics beyond the SM. The
secondary decay $K^{*+}\to K\pi$ can be used to study a number of angular
observables, which are worked out in terms of short-distance Wilson
coefficients and hadronic form factors. Our analysis allows for an independent
extraction of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$ and for
the determination of certain ratios of $\bar{B}_s\to K^*$ form factors.
Moreover, a future precision measurement of the forward-backward asymmetry in
the $\bar{B}_s \to K^{*+} \ell^-\bar\nu_\ell$ decay can be used to
unambiguously verify the left-handed nature of the transition operator as
predicted by the SM. We provide numerical estimates for the relevant angular
observables and the resulting decay distributions on the basis of available
form-factor information from lattice and sum-rule estimates. In addition, we
pay particular attention to suitable combinations of angular observables in the
decays $\bar{B}_s \to K^{*+}(\to K\pi)\ell^-\bar\nu_\ell$ and $\bar{B} \to
K^{*0}(\to K\pi)\ell^+\ell^-$, and find that they provide complementary
constraints on the relevant $b\to s$ short-distance coefficients. As a
by-product, we perform a SM fit on the basis of selected experimental decay
rates and hadronic input functions, which results in $|V_{ub}| = (4.07 \pm
0.20) \cdot 10^{-3}$.
| [
{
"created": "Tue, 31 Mar 2015 14:30:14 GMT",
"version": "v1"
}
] | 2015-08-19 | [
[
"Feldmann",
"Thorsten",
"",
"Siegen U."
],
[
"Müller",
"Bastian",
"",
"Siegen U."
],
[
"van Dyk",
"Danny",
"",
"Siegen U."
]
] | We study the semileptonic decay $\bar{B}_s \to K^{*+} \ell^-\bar\nu_\ell$, which is induced by $b\to u \ell^- \bar\nu_\ell$ transitions at the quark level. We take into account the standard model (SM) operator from $W$-boson exchange as well as possible extensions from physics beyond the SM. The secondary decay $K^{*+}\to K\pi$ can be used to study a number of angular observables, which are worked out in terms of short-distance Wilson coefficients and hadronic form factors. Our analysis allows for an independent extraction of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$ and for the determination of certain ratios of $\bar{B}_s\to K^*$ form factors. Moreover, a future precision measurement of the forward-backward asymmetry in the $\bar{B}_s \to K^{*+} \ell^-\bar\nu_\ell$ decay can be used to unambiguously verify the left-handed nature of the transition operator as predicted by the SM. We provide numerical estimates for the relevant angular observables and the resulting decay distributions on the basis of available form-factor information from lattice and sum-rule estimates. In addition, we pay particular attention to suitable combinations of angular observables in the decays $\bar{B}_s \to K^{*+}(\to K\pi)\ell^-\bar\nu_\ell$ and $\bar{B} \to K^{*0}(\to K\pi)\ell^+\ell^-$, and find that they provide complementary constraints on the relevant $b\to s$ short-distance coefficients. As a by-product, we perform a SM fit on the basis of selected experimental decay rates and hadronic input functions, which results in $|V_{ub}| = (4.07 \pm 0.20) \cdot 10^{-3}$. |
1711.05510 | Tord Riemann | Johannes Bluemlein (1) and Khiem Hong Phan (1,2) and Tord Riemann
(1,3) ((1) DESY, (2) Vietnam National University, (3) University of Silesia) | Scalar one-loop vertex integrals as meromorphic functions of space-time
dimension d | 9 pages, talk presented by TR at workshop "Matter To The Deepest",
XLI International Conference on Recent Developments in Physics of Fundamental
Interactions (MTTD 2017), September 3-8, 2017, Podlesice, Poland, to appear
in the proceedings | null | 10.5506/APhysPolB.48.2313 | KW 17-002, DESY 17-186, DO-TH 17/29 | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | Representations are derived for the basic scalar one-loop vertex Feynman
integrals as meromorphic functions of the space-time dimension $d$ in terms of
(generalized) hypergeometric functions $_2F_1$ and $F_1$. Values at asymptotic
or exceptional kinematic points as well as expansions around the singular
points at $d=4+2n$, $n$ non-negative integers, may be derived from the
representations easily. The Feynman integrals studied here may be used as
building blocks for the calculation of one-loop and higher-loop scalar and
tensor amplitudes. From the recursion relation presented, higher n-point
functions may be obtained in a straightforward manner.
| [
{
"created": "Wed, 15 Nov 2017 11:50:55 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Bluemlein",
"Johannes",
"",
"DESY"
],
[
"Phan",
"Khiem Hong",
"",
"DESY",
"Vietnam National University"
],
[
"Riemann",
"Tord",
"",
"DESY",
"University of Silesia"
]
] | Representations are derived for the basic scalar one-loop vertex Feynman integrals as meromorphic functions of the space-time dimension $d$ in terms of (generalized) hypergeometric functions $_2F_1$ and $F_1$. Values at asymptotic or exceptional kinematic points as well as expansions around the singular points at $d=4+2n$, $n$ non-negative integers, may be derived from the representations easily. The Feynman integrals studied here may be used as building blocks for the calculation of one-loop and higher-loop scalar and tensor amplitudes. From the recursion relation presented, higher n-point functions may be obtained in a straightforward manner. |
hep-ph/9410259 | null | Anjan S. Joshipura and Jose W. F. Valle | Reconciling Cold Dark Matter with COBE/IRAS Plus Solar and Atmospheric
Neutrino Data | latex. This version includes the figure as a compressed fig.uu file,
appended at the end. Moreover it adds a reference to the work of Chun, Kim
and Kim | Nucl.Phys.B440:647-660,1995 | 10.1016/0550-3213(95)00060-6 | null | hep-ph astro-ph | null | We present a model where an unstable MeV Majorana tau \neu can naturally
reconcile the cold dark matter model (CDM) with cosmological observations of
large and small scale density fluctuations and, simultaneously, with data on
solar and atmospheric neutrinos. The solar \neu deficit is explained through
long wavelength, so-called {\sl just-so} oscillations involving conversions of
\ne into both \nm and a sterile species \ns, while atmospheric \neu data are
explained through \nm to \ne conversions. Future long baseline \neu oscillation
experiments, as well as some reactor experiments will test this hypothesis. The
model is based on the spontaneous violation of a global lepton number symmetry
at the weak scale. This symmetry plays a key role in generating the
cosmologically required decay of the \nt with lifetime $\tau_{\nu_\tau} \sim
10^2 - 10^4$ seconds, as well as the masses and oscillations of the three light
\neus \ne, \nm and \ns required in order to account for solar and atmospheric
\neu data. It also leads to the invisibly decaying higgs signature that can be
searched at LEP and future particle colliders.
| [
{
"created": "Tue, 11 Oct 1994 12:02:29 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 1994 14:22:06 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Joshipura",
"Anjan S.",
""
],
[
"Valle",
"Jose W. F.",
""
]
] | We present a model where an unstable MeV Majorana tau \neu can naturally reconcile the cold dark matter model (CDM) with cosmological observations of large and small scale density fluctuations and, simultaneously, with data on solar and atmospheric neutrinos. The solar \neu deficit is explained through long wavelength, so-called {\sl just-so} oscillations involving conversions of \ne into both \nm and a sterile species \ns, while atmospheric \neu data are explained through \nm to \ne conversions. Future long baseline \neu oscillation experiments, as well as some reactor experiments will test this hypothesis. The model is based on the spontaneous violation of a global lepton number symmetry at the weak scale. This symmetry plays a key role in generating the cosmologically required decay of the \nt with lifetime $\tau_{\nu_\tau} \sim 10^2 - 10^4$ seconds, as well as the masses and oscillations of the three light \neus \ne, \nm and \ns required in order to account for solar and atmospheric \neu data. It also leads to the invisibly decaying higgs signature that can be searched at LEP and future particle colliders. |
hep-ph/9704283 | null | F. Benatti and R. Floreanini | Experimental limits on complete positivity from the K-K system | 13 pages, plain-TeX, to appear in Phys. Lett. B | Phys.Lett. B401 (1997) 337-346 | 10.1016/S0370-2693(97)00409-7 | null | hep-ph hep-th | null | Available data on measured observables allow deriving estimates for some of
the phenomenological parameters that characterize the time-evolution and decay
of the neutral kaon system based on the hypothesis of complete positivity. The
present experimental uncertainties are still too large to permit a full test of
complete positivity.
| [
{
"created": "Thu, 10 Apr 1997 14:14:22 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Benatti",
"F.",
""
],
[
"Floreanini",
"R.",
""
]
] | Available data on measured observables allow deriving estimates for some of the phenomenological parameters that characterize the time-evolution and decay of the neutral kaon system based on the hypothesis of complete positivity. The present experimental uncertainties are still too large to permit a full test of complete positivity. |
hep-ph/0011386 | Dominique Monderen | Dominique Monderen | Neutrino focusing | 7 pages; 2 figures. Talk presented at the 'XXXVth Rencontres de
Moriond ElectroWeak Interactions and Unified Theories', March 2000, Les Arcs,
France | null | null | ULB-TH00/20 | hep-ph astro-ph | null | We study the lensing of neutrinos by astrophysical objects. At the difference
of photons, neutrinos can cross a stellar core; as a result the lens quality
improves. While Uranians alone would benefit from this effect in the Sun,
similar effects could be considered for binary systems.
| [
{
"created": "Thu, 30 Nov 2000 11:04:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Monderen",
"Dominique",
""
]
] | We study the lensing of neutrinos by astrophysical objects. At the difference of photons, neutrinos can cross a stellar core; as a result the lens quality improves. While Uranians alone would benefit from this effect in the Sun, similar effects could be considered for binary systems. |
1601.04928 | Radja Boughezal | Radja Boughezal | NNLO phenomenology using N-jettiness subtraction | 8 pages, 5 figures, to appear in the proceedings of the 12th
International Symposium on Radiative Corrections (Radcor 2015) and LoopFest
XIV (Radiative Corrections for the LHC and Future Colliders). V2: added
references | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss next-to-next-to-leading order QCD results for Higgs, W-boson and
Z-boson production in association with a jet in hadronic collisions, obtained
using the recently developed N-jettiness subtraction method.
| [
{
"created": "Tue, 19 Jan 2016 14:14:53 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2016 13:07:01 GMT",
"version": "v2"
}
] | 2016-01-22 | [
[
"Boughezal",
"Radja",
""
]
] | We discuss next-to-next-to-leading order QCD results for Higgs, W-boson and Z-boson production in association with a jet in hadronic collisions, obtained using the recently developed N-jettiness subtraction method. |
hep-ph/9910312 | Kent Hornbostel | K. Hornbostel | String Breaking in Two-Dimensional QCD | 9 pages, 3 figures, LaTeX2e Contribution to the Proceedings of the
TJNAF Workshop on the Transition from Low to High Q Form Factors, Athens, GA,
September 17, 1999. Minor typos corrected | null | null | SMUHEP 99-11 | hep-ph hep-lat | null | I present results of a numerical calculation of the effects of light
quark-antiquark pairs on the linear heavy-quark potential in light-cone
quantized two-dimensional QCD. I extract the potential from the Q-Qbar
component of the ground-state wavefunction, and observe string breaking at the
heavy-light meson pair threshold. I briefly comment on the states responsible
for the breaking.
| [
{
"created": "Tue, 12 Oct 1999 17:31:45 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Nov 1999 01:24:04 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hornbostel",
"K.",
""
]
] | I present results of a numerical calculation of the effects of light quark-antiquark pairs on the linear heavy-quark potential in light-cone quantized two-dimensional QCD. I extract the potential from the Q-Qbar component of the ground-state wavefunction, and observe string breaking at the heavy-light meson pair threshold. I briefly comment on the states responsible for the breaking. |
hep-ph/9811226 | Xiao-Gang He | Wu-Sheng Dai (Nankai) Xiao-Gang He (NTU), Xue-Qian Li (Nankai) and
Gang Zhao (Nankai) | Non-Spectator Contributions to Inclusive Charmless $B$ Decays | 11 pages, Revtex | Phys. Rev. D 60, 034005 (1999) | 10.1103/PhysRevD.60.034005 | null | hep-ph | null | The light quarks inside $B$ mesons are usually treated as spectators and do
not affect the decay rates which are assumed to be purely due to b quark
decays. In this paper we calculate the non-spectator contributions to inclusive
charmless $B$ decays due to the spectator effects. We find that the
non-spectator contributions to the branching ratio for $\bar B^0$ are small
($<2\times 10^{-4}$), but the contributions to $\Delta S = 0$ and $\Delta S =
-1$, $B^-$ decay branching ratios can be as large as $-7.5\times 10^{-4}$ and
$2\times 10^{-3}$, respectively. These contributions may play an important role
in rare charmless $B$ decays.
| [
{
"created": "Tue, 3 Nov 1998 06:49:27 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Dai",
"Wu-Sheng",
"",
"Nankai"
],
[
"He",
"Xiao-Gang",
"",
"NTU"
],
[
"Li",
"Xue-Qian",
"",
"Nankai"
],
[
"Zhao",
"Gang",
"",
"Nankai"
]
] | The light quarks inside $B$ mesons are usually treated as spectators and do not affect the decay rates which are assumed to be purely due to b quark decays. In this paper we calculate the non-spectator contributions to inclusive charmless $B$ decays due to the spectator effects. We find that the non-spectator contributions to the branching ratio for $\bar B^0$ are small ($<2\times 10^{-4}$), but the contributions to $\Delta S = 0$ and $\Delta S = -1$, $B^-$ decay branching ratios can be as large as $-7.5\times 10^{-4}$ and $2\times 10^{-3}$, respectively. These contributions may play an important role in rare charmless $B$ decays. |
1706.01964 | William Klemm | Abdesslam Arhrib, Rachid Benbrik, Rikard Enberg, William Klemm,
Stefano Moretti and Shoaib Munir | Identifying a light charged Higgs boson at the LHC Run II | 11 pages, 7 figures | Phys.Lett. B774 (2017) 591-598 | 10.1016/j.physletb.2017.10.006 | KIAS-P17035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the phenomenological implications of a light Higgs boson, $h$,
within the CP-conserving 2-Higgs Doublet Model (2HDM) Type-I, for the detection
prospects of the charged $H^\pm$ state at Run II of the Large Hadron Collider
(LHC), assuming $\sqrt{s}=13$ TeV as energy and ${\cal O}(100~{\rm fb}^{-1})$
as luminosity. When sufficiently light, this $h$ state can open up the bosonic
decay channel $H^\pm \to W^{\pm(*)}h$, which may have a branching ratio
significantly exceeding those of the $H^\pm \to \tau\nu$ and $H^\pm \to cs$
channels. We perform a broad scan of the 2HDM Type-I parameter space, assuming
the heavier of the two CP-even Higgs bosons, $H$, to be the observed SM-like
state with a mass near 125 GeV. Through these scans we highlight regions in
which $m_{H^\pm} < m_t +m_b$ that are still consistent with the most recent
limits from experimental searches. We find in these regions that, when the
$H^\pm \to W^{\pm(*)}h$ decay mode is the dominant one, the $h$ can be highly
fermiophobic, with a considerably large decay rate in the $\gamma\gamma$
channel. This can result in the total cross section of the $\sigma(pp\to H^\pm
h \to W^{\pm(*)} + 4\gamma)$ process reaching up to ${\cal O}(100~{\rm fb})$.
We therefore investigate the possibility of observing this spectacular signal
at the LHC Run II.
| [
{
"created": "Tue, 6 Jun 2017 20:34:35 GMT",
"version": "v1"
}
] | 2018-09-14 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Benbrik",
"Rachid",
""
],
[
"Enberg",
"Rikard",
""
],
[
"Klemm",
"William",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
]
] | We analyse the phenomenological implications of a light Higgs boson, $h$, within the CP-conserving 2-Higgs Doublet Model (2HDM) Type-I, for the detection prospects of the charged $H^\pm$ state at Run II of the Large Hadron Collider (LHC), assuming $\sqrt{s}=13$ TeV as energy and ${\cal O}(100~{\rm fb}^{-1})$ as luminosity. When sufficiently light, this $h$ state can open up the bosonic decay channel $H^\pm \to W^{\pm(*)}h$, which may have a branching ratio significantly exceeding those of the $H^\pm \to \tau\nu$ and $H^\pm \to cs$ channels. We perform a broad scan of the 2HDM Type-I parameter space, assuming the heavier of the two CP-even Higgs bosons, $H$, to be the observed SM-like state with a mass near 125 GeV. Through these scans we highlight regions in which $m_{H^\pm} < m_t +m_b$ that are still consistent with the most recent limits from experimental searches. We find in these regions that, when the $H^\pm \to W^{\pm(*)}h$ decay mode is the dominant one, the $h$ can be highly fermiophobic, with a considerably large decay rate in the $\gamma\gamma$ channel. This can result in the total cross section of the $\sigma(pp\to H^\pm h \to W^{\pm(*)} + 4\gamma)$ process reaching up to ${\cal O}(100~{\rm fb})$. We therefore investigate the possibility of observing this spectacular signal at the LHC Run II. |
2003.12850 | Igor Volobuev | Eduard Boos, Igor Volobuev | The specificity of the interactions of electroweak gauge bosons coming
from extra dimensions | null | null | 10.1142/S0217751X21500500 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the specificity of the interactions of the electroweak gauge boson
excitations in models with warped extra dimensions. In particular, we show that
the couplings of the gauge boson excitations $W^{\prime}$, $Z^{\prime}$, and
$\gamma^\prime$ to the SM gauge bosons treated as the zero modes of the 5D
gauge fields are either exactly equal to zero or very much suppressed. In the
former case, the three-particle and four-particle interaction Lagrangians of
the SM gauge bosons and their lowest excitations are found explicitly.
Meanwhile, the couplings of $W^{\prime}$, $Z^{\prime}$, and $\gamma^\prime$ to
the SM fermions are non-zero allowing for their production and decays. These
are the characteristic features of the gauge boson excitations in models with
warped extra dimensions, which distinguish them from the gauge boson
excitations in other models beyond the SM.
| [
{
"created": "Sat, 28 Mar 2020 17:50:10 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2020 17:45:31 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Dec 2020 16:14:30 GMT",
"version": "v3"
}
] | 2021-04-21 | [
[
"Boos",
"Eduard",
""
],
[
"Volobuev",
"Igor",
""
]
] | We discuss the specificity of the interactions of the electroweak gauge boson excitations in models with warped extra dimensions. In particular, we show that the couplings of the gauge boson excitations $W^{\prime}$, $Z^{\prime}$, and $\gamma^\prime$ to the SM gauge bosons treated as the zero modes of the 5D gauge fields are either exactly equal to zero or very much suppressed. In the former case, the three-particle and four-particle interaction Lagrangians of the SM gauge bosons and their lowest excitations are found explicitly. Meanwhile, the couplings of $W^{\prime}$, $Z^{\prime}$, and $\gamma^\prime$ to the SM fermions are non-zero allowing for their production and decays. These are the characteristic features of the gauge boson excitations in models with warped extra dimensions, which distinguish them from the gauge boson excitations in other models beyond the SM. |
hep-ph/9906348 | Zhang. dh | De-Hai Zhang (Graduate School, Academia Sinica) | The Cosmological Constant as a Residual Energy in the Chaotic
Inflationary Model | 7 pages, no figures, Latex | null | null | GS-AS-990612 | hep-ph astro-ph gr-qc | null | A new idea of the cosmological constant is proposed in this paper. Due to the
horizon is limited, the quantum fluctuation of the inflaton field is not zero,
a nonzero vacuum energy is remained as a residual inflationary energy of an
unusual potential, however the true stable vacuum energy is zero fortunately. A
unified model of the cosmological constant and the chaotic inflation is
proposed, which satisfies almost all cosmological phenomenology and will can be
tested by data of the cosmic large scale structure.
| [
{
"created": "Sat, 12 Jun 1999 15:58:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhang",
"De-Hai",
"",
"Graduate School, Academia Sinica"
]
] | A new idea of the cosmological constant is proposed in this paper. Due to the horizon is limited, the quantum fluctuation of the inflaton field is not zero, a nonzero vacuum energy is remained as a residual inflationary energy of an unusual potential, however the true stable vacuum energy is zero fortunately. A unified model of the cosmological constant and the chaotic inflation is proposed, which satisfies almost all cosmological phenomenology and will can be tested by data of the cosmic large scale structure. |
2304.08575 | June-Young Kim | June-Young Kim, Ho-Yeon Won, Jose L. Goity, Christian Weiss | QCD angular momentum in $N \rightarrow \Delta$ transitions | 7 pages, 1 figure | null | 10.1016/j.physletb.2023.138083 | JLAB-THY-23-3795 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $N \rightarrow \Delta$ transitions offer new possibilities for exploring the
isovector component of the QCD quark angular momentum (AM) operator causing the
$J^{u - d}$ flavor asymmetry in the nucleon. We extend the concept of QCD AM to
transitions between baryon states, using light-front densities of the
energy-momentum tensor in transversely localized states. We calculate the $N
\rightarrow \Delta$ transition AM in the $1/N_c$ expansion, connect it with the
$J^{u - d}$ flavor asymmetry in the nucleon, and estimate the values using
lattice QCD results. In the same setup we connect the transition AM to the
transition GPDs sampled in hard exclusive electroproduction processes with $N
\rightarrow \Delta$ transitions, enabling experimental study of the transition
AM.
| [
{
"created": "Mon, 17 Apr 2023 19:33:56 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Kim",
"June-Young",
""
],
[
"Won",
"Ho-Yeon",
""
],
[
"Goity",
"Jose L.",
""
],
[
"Weiss",
"Christian",
""
]
] | $N \rightarrow \Delta$ transitions offer new possibilities for exploring the isovector component of the QCD quark angular momentum (AM) operator causing the $J^{u - d}$ flavor asymmetry in the nucleon. We extend the concept of QCD AM to transitions between baryon states, using light-front densities of the energy-momentum tensor in transversely localized states. We calculate the $N \rightarrow \Delta$ transition AM in the $1/N_c$ expansion, connect it with the $J^{u - d}$ flavor asymmetry in the nucleon, and estimate the values using lattice QCD results. In the same setup we connect the transition AM to the transition GPDs sampled in hard exclusive electroproduction processes with $N \rightarrow \Delta$ transitions, enabling experimental study of the transition AM. |
hep-ph/9411326 | null | Thomas G. Rizzo | Constraints on the Left-Right Symmetric Model from $b\to s\gamma$ | 6 pages, 8 figures(available on request), LaTex, Worldsci Macro | null | null | SLAC-PUB-6719 | hep-ph | null | The recent observation by the CLEO Collaboration of the inclusive decay $b\to
s\gamma$ with a branching fraction consistent with the expectations of the
Standard Model is used to constrain the parameter space of the Left-Right
Symmetric Model. Two scenarios are considered: ($i$) equal left- and right-
handed Cabibbo-Kobayashi-Maskawa mixing matrices, $V_L=V_R (~{\rm or}~V_R^*)$
and ($ii$) the Gronau-Wakaizumi model wherein B-decays proceed only via
right-handed currents and $V_L$ and $V_R$ are quite distinct. In the later case
the bounds from $b\to s\gamma$ are combined with other constraints leaving a
parameter range that is very highly restricted and which implies that this
model may soon be completely ruled out by improving data. (To appear in the
{\it Proceedings of the 1994 International Workshop on B Physics, Physics
Beyond the Standard Model at the B Factory}, Nagoya, Japan, October 26-28,
1994.)
| [
{
"created": "Thu, 17 Nov 1994 22:38:34 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Rizzo",
"Thomas G.",
""
]
] | The recent observation by the CLEO Collaboration of the inclusive decay $b\to s\gamma$ with a branching fraction consistent with the expectations of the Standard Model is used to constrain the parameter space of the Left-Right Symmetric Model. Two scenarios are considered: ($i$) equal left- and right- handed Cabibbo-Kobayashi-Maskawa mixing matrices, $V_L=V_R (~{\rm or}~V_R^*)$ and ($ii$) the Gronau-Wakaizumi model wherein B-decays proceed only via right-handed currents and $V_L$ and $V_R$ are quite distinct. In the later case the bounds from $b\to s\gamma$ are combined with other constraints leaving a parameter range that is very highly restricted and which implies that this model may soon be completely ruled out by improving data. (To appear in the {\it Proceedings of the 1994 International Workshop on B Physics, Physics Beyond the Standard Model at the B Factory}, Nagoya, Japan, October 26-28, 1994.) |
1604.07633 | Alexei P. Martynenko | A.A. Karyasov, A.P. Martynenko, F.A. Martynenko (Samara University) | Relativistic corrections to the pair $B_c$-meson production in $e^+e^-$
annihilation | 15 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1308.3998 | Nuclear Physics B 911 (2016) 36-51 | 10.1016/j.nuclphysb.2016.07.034 | SSU-HEP-16/04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic corrections to the pair $B_c$-meson production in
$e^+e^-$-annihilation are calculated. We investigate a production of pair
pseudoscalar, vector and pseudoscalar+vector $B_c$-mesons in the leading order
perturbative quantum chromodynamics and relativistic quark model. Relativistic
expressions of the pair production cross sections are obtained. Their numerical
evaluation shows that relativistic effects in the production amplitudes and
bound state wave functions three times reduce nonrelativistic results at the
center-of-mass energy s=22 GeV.
| [
{
"created": "Tue, 26 Apr 2016 11:52:07 GMT",
"version": "v1"
}
] | 2016-08-11 | [
[
"Karyasov",
"A. A.",
"",
"Samara University"
],
[
"Martynenko",
"A. P.",
"",
"Samara University"
],
[
"Martynenko",
"F. A.",
"",
"Samara University"
]
] | Relativistic corrections to the pair $B_c$-meson production in $e^+e^-$-annihilation are calculated. We investigate a production of pair pseudoscalar, vector and pseudoscalar+vector $B_c$-mesons in the leading order perturbative quantum chromodynamics and relativistic quark model. Relativistic expressions of the pair production cross sections are obtained. Their numerical evaluation shows that relativistic effects in the production amplitudes and bound state wave functions three times reduce nonrelativistic results at the center-of-mass energy s=22 GeV. |
2204.12231 | Akanksha Bhardwaj | Oliver Atkinson, Akanksha Bhardwaj, Christoph Englert, Partha Konar,
Vishal S. Ngairangbam, and Michael Spannowsky | IRC-safe Graph Autoencoder for unsupervised anomaly detection | 16 pages, 5 figures, Matched with the published version | Front. Artif. Intell., 22 July 2022 Sec. Big Data and AI in High
Energy Physics | 10.3389/frai.2022.943135 | null | hep-ph cs.LG hep-ex | http://creativecommons.org/licenses/by/4.0/ | Anomaly detection through employing machine learning techniques has emerged
as a novel powerful tool in the search for new physics beyond the Standard
Model. Historically similar to the development of jet observables, theoretical
consistency has not always assumed a central role in the fast development of
algorithms and neural network architectures. In this work, we construct an
infrared and collinear safe autoencoder based on graph neural networks by
employing energy-weighted message passing. We demonstrate that whilst this
approach has theoretically favourable properties, it also exhibits formidable
sensitivity to non-QCD structures.
| [
{
"created": "Tue, 26 Apr 2022 11:21:09 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Jul 2022 22:36:48 GMT",
"version": "v2"
}
] | 2022-08-02 | [
[
"Atkinson",
"Oliver",
""
],
[
"Bhardwaj",
"Akanksha",
""
],
[
"Englert",
"Christoph",
""
],
[
"Konar",
"Partha",
""
],
[
"Ngairangbam",
"Vishal S.",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Anomaly detection through employing machine learning techniques has emerged as a novel powerful tool in the search for new physics beyond the Standard Model. Historically similar to the development of jet observables, theoretical consistency has not always assumed a central role in the fast development of algorithms and neural network architectures. In this work, we construct an infrared and collinear safe autoencoder based on graph neural networks by employing energy-weighted message passing. We demonstrate that whilst this approach has theoretically favourable properties, it also exhibits formidable sensitivity to non-QCD structures. |
1404.0272 | Basudeb Dasgupta | Basudeb Dasgupta, and Alexei Yu. Smirnov | Leptonic CP Violation Phases, Quark-Lepton Similarity and Seesaw
Mechanism | 30 pages. v3(typos fixed, matches version published in Nucl. Phys. B) | Nuclear Physics B, Volume 884, July 2014, Pages 357-378 | 10.1016/j.nuclphysb.2014.05.001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore generic features of the leptonic CP violation in the framework of
the seesaw type I mechanism with similarity of the Dirac lepton and quarks mass
matrices $m_D$. For this, we elaborate on the standard parametrization
conditions which allow to simultaneously obtain the Dirac and Majorana phases.
If the only origin of CP violation is the left-handed (LH) transformation which
diagonalizes $m_D$ (similar to quarks), the leptonic CP violation is suppressed
and the Dirac phase is close to $\pi$ or to $0$ with $\sin \delta_{CP} \approx
(\sin \theta_{13}^q /\sin \theta_{13}) \cos \theta_{23} \sin \delta_q \sim
\lambda^2 \sin \delta_q$. Here $\lambda \sim \theta_C$, is the Cabibbo mixing
angle, and $\theta_{13}^q$ and $\theta_{13}$ are the 1-3 mixing angles of
quarks and leptons respectively. The Majorana phases $\beta_1$ and $\beta_2$
are suppressed as $\lambda^3\sin\delta_q$. For Majorana neutrinos implied by
seesaw, the right-handed (RH) transformations are important. We explore the
simplest extension inspired by Left-Right (L-R) symmetry with small CKM-type CP
violation. In this case, seesaw enhancement of the CP violation occurs due to
strong hierarchy of the eigenvalues of $m_D$ leading to $\delta_{CP} \sim 1$.
The enhancement is absent under the phase factorization conditions which
require certain relations between parameters of the Majorana mass matrix of RH
neutrinos.
| [
{
"created": "Tue, 1 Apr 2014 15:19:59 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2014 12:37:13 GMT",
"version": "v2"
},
{
"created": "Tue, 20 May 2014 11:47:07 GMT",
"version": "v3"
}
] | 2014-05-30 | [
[
"Dasgupta",
"Basudeb",
""
],
[
"Smirnov",
"Alexei Yu.",
""
]
] | We explore generic features of the leptonic CP violation in the framework of the seesaw type I mechanism with similarity of the Dirac lepton and quarks mass matrices $m_D$. For this, we elaborate on the standard parametrization conditions which allow to simultaneously obtain the Dirac and Majorana phases. If the only origin of CP violation is the left-handed (LH) transformation which diagonalizes $m_D$ (similar to quarks), the leptonic CP violation is suppressed and the Dirac phase is close to $\pi$ or to $0$ with $\sin \delta_{CP} \approx (\sin \theta_{13}^q /\sin \theta_{13}) \cos \theta_{23} \sin \delta_q \sim \lambda^2 \sin \delta_q$. Here $\lambda \sim \theta_C$, is the Cabibbo mixing angle, and $\theta_{13}^q$ and $\theta_{13}$ are the 1-3 mixing angles of quarks and leptons respectively. The Majorana phases $\beta_1$ and $\beta_2$ are suppressed as $\lambda^3\sin\delta_q$. For Majorana neutrinos implied by seesaw, the right-handed (RH) transformations are important. We explore the simplest extension inspired by Left-Right (L-R) symmetry with small CKM-type CP violation. In this case, seesaw enhancement of the CP violation occurs due to strong hierarchy of the eigenvalues of $m_D$ leading to $\delta_{CP} \sim 1$. The enhancement is absent under the phase factorization conditions which require certain relations between parameters of the Majorana mass matrix of RH neutrinos. |
hep-ph/9511386 | Steve Kuhlmann | J. Huston, E. Kovacs, S. Kuhlmann, H. L. Lai, J. F. Owens, D. Soper,
W. K. Tung | Large Transverse Momentum Jet Production and the Gluon Distribution
Inside the Proton | 6 page Latex file using epsf.sty for 4 ps figures. Revised with more
up-to-date gluon distributions | Phys.Rev.Lett. 77 (1996) 444-447 | 10.1103/PhysRevLett.77.444 | Michigan State Report # MSU-HEP-50812, FSU-HEP-951031, CTEQ-512 | hep-ph hep-ex | null | The CDF experiment has reported an excess of high-$p_t$ jets compared to
previous next-to-leading order QCD expectations. Before attributing this to new
physics effects, we investigate whether these high-$p_t$ jets can be explained
by a modified gluon distribution inside the proton. We find enough flexibility
in a global QCD analysis including the CDF inclusive jet data to provide a
25-35\% increase in the jet cross sections at the highest $p_t$ of the
experiment. Two possible sets of parton distributions are presented, and the
effects of these on other existing data sets are presented. Further theoretical
and experimental work needed to clarify unresolved issues is outlined.
| [
{
"created": "Tue, 21 Nov 1995 19:57:26 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 1996 22:16:41 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Huston",
"J.",
""
],
[
"Kovacs",
"E.",
""
],
[
"Kuhlmann",
"S.",
""
],
[
"Lai",
"H. L.",
""
],
[
"Owens",
"J. F.",
""
],
[
"Soper",
"D.",
""
],
[
"Tung",
"W. K.",
""
]
] | The CDF experiment has reported an excess of high-$p_t$ jets compared to previous next-to-leading order QCD expectations. Before attributing this to new physics effects, we investigate whether these high-$p_t$ jets can be explained by a modified gluon distribution inside the proton. We find enough flexibility in a global QCD analysis including the CDF inclusive jet data to provide a 25-35\% increase in the jet cross sections at the highest $p_t$ of the experiment. Two possible sets of parton distributions are presented, and the effects of these on other existing data sets are presented. Further theoretical and experimental work needed to clarify unresolved issues is outlined. |
1311.1052 | Dalibor Kekez | D. Klabu\v{c}ar, S. Beni\'c, D. Horvati\'c, D. Kekez | eta' multiplicity and Witten-Veneziano relation at T>0 | appolb.sty, 6 pages, no figures. arXiv admin note: substantial text
overlap with arXiv:1105.0356 | Acta Phys.Polon.Supp. 6 (2013) 3, 935 | 10.5506/APhysPolBSupp.6.935 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent RHIC results on eta' multiplicity in heavy-ion collisions are of great
importance because they clearly signal a partial restoration of U_A(1) symmetry
at high temperatures T, and thus provide an unambiguous signature of the
formation of a new state of matter. Prompted by these experimental results of
STAR and PHENIX collaborations, we discuss and propose the minimal
generalization of the Witten-Veneziano relation to finite T.
| [
{
"created": "Tue, 5 Nov 2013 13:57:01 GMT",
"version": "v1"
}
] | 2013-11-06 | [
[
"Klabučar",
"D.",
""
],
[
"Benić",
"S.",
""
],
[
"Horvatić",
"D.",
""
],
[
"Kekez",
"D.",
""
]
] | Recent RHIC results on eta' multiplicity in heavy-ion collisions are of great importance because they clearly signal a partial restoration of U_A(1) symmetry at high temperatures T, and thus provide an unambiguous signature of the formation of a new state of matter. Prompted by these experimental results of STAR and PHENIX collaborations, we discuss and propose the minimal generalization of the Witten-Veneziano relation to finite T. |
0801.4235 | Mihail Chizhov | M. V. Chizhov, V. A. Bednyakov and J. A. Budagov | Proposal for chiral bosons search at LHC via their unique new signature | 4 pages, 5 figures | Phys.Atom.Nucl.71:2096-2100,2008 | 10.1134/S1063778808120107 | null | hep-ph hep-ex | null | The resonance production of new chiral spin-1 bosons and their detection
through the Drell--Yan process at the CERN LHC is considered. Quantitative
evaluations of various differential cross-sections of the chiral bosons
production are made within the CalcHEP package. The new neutral chiral bosons
can be observed as a Breit--Wigner resonance peak in the invariant dilepton
mass distribution, as usual. However, unique new signatures of the chiral
bosons exist. First, there is no Jacobian peak in the lepton transverse
momentum distribution. Second, the lepton angular distribution in the
Collins-Soper frame for the high on-peak invariant masses of the lepton pairs
has a peculiar "swallowtail" shape.
| [
{
"created": "Mon, 28 Jan 2008 10:40:51 GMT",
"version": "v1"
}
] | 2009-01-26 | [
[
"Chizhov",
"M. V.",
""
],
[
"Bednyakov",
"V. A.",
""
],
[
"Budagov",
"J. A.",
""
]
] | The resonance production of new chiral spin-1 bosons and their detection through the Drell--Yan process at the CERN LHC is considered. Quantitative evaluations of various differential cross-sections of the chiral bosons production are made within the CalcHEP package. The new neutral chiral bosons can be observed as a Breit--Wigner resonance peak in the invariant dilepton mass distribution, as usual. However, unique new signatures of the chiral bosons exist. First, there is no Jacobian peak in the lepton transverse momentum distribution. Second, the lepton angular distribution in the Collins-Soper frame for the high on-peak invariant masses of the lepton pairs has a peculiar "swallowtail" shape. |
2204.13121 | Kimiko Yamashita | Xu Li, Ken Mimasu, Kimiko Yamashita, Chengjie Yang, Cen Zhang,
Shuang-Yong Zhou | Moments for positivity: using Drell-Yan data to test positivity bounds
and reverse-engineer new physics | 54 pages, 8 figures, 9 tables, version to appear in JHEP | JHEP10(2022)107 | 10.1007/JHEP10(2022)107 | USTC-ICTS/PCFT-22-12, KCL-PH-TH/2022-09 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Moments of the leptonic angular distribution in the Drell-Yan process have
recently been shown to be sensitive probes of a specific class of dimension-8,
four-fermion operators in the Standard Model Effective Field Theory, involving
a pair of quarks and leptons. The same operators are also subject to positivity
bounds, when requiring the associated (unknown) UV completion to obey basic
principles of quantum field theory. We perform a phenomenological study to
quantify the sensitivity of the high-luminosity LHC to this set of operators
and, by extension, the positivity bounds. We further extend the angular basis
of moments and consider double differential information to improve the ability
to disentangle the different operators, leading to a sensitivity to new physics
scales up to 3 TeV. We use this information to explore the violation of
positivity at the LHC as a way to test the underlying principles of quantum
field theory. Finally, we present a case study which combines our results with
information from other (current and prospective) experiments, as well as the
positivity cone to infer the properties of possible tree-level UV completions.
The data lead to robust, model-independent lower bounds on the $M/\sqrt{g}$
combination of the particle mass and coupling, for states that couple to
right-handed leptons and/or up quarks.
| [
{
"created": "Wed, 27 Apr 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Oct 2022 01:31:43 GMT",
"version": "v2"
}
] | 2022-10-19 | [
[
"Li",
"Xu",
""
],
[
"Mimasu",
"Ken",
""
],
[
"Yamashita",
"Kimiko",
""
],
[
"Yang",
"Chengjie",
""
],
[
"Zhang",
"Cen",
""
],
[
"Zhou",
"Shuang-Yong",
""
]
] | Moments of the leptonic angular distribution in the Drell-Yan process have recently been shown to be sensitive probes of a specific class of dimension-8, four-fermion operators in the Standard Model Effective Field Theory, involving a pair of quarks and leptons. The same operators are also subject to positivity bounds, when requiring the associated (unknown) UV completion to obey basic principles of quantum field theory. We perform a phenomenological study to quantify the sensitivity of the high-luminosity LHC to this set of operators and, by extension, the positivity bounds. We further extend the angular basis of moments and consider double differential information to improve the ability to disentangle the different operators, leading to a sensitivity to new physics scales up to 3 TeV. We use this information to explore the violation of positivity at the LHC as a way to test the underlying principles of quantum field theory. Finally, we present a case study which combines our results with information from other (current and prospective) experiments, as well as the positivity cone to infer the properties of possible tree-level UV completions. The data lead to robust, model-independent lower bounds on the $M/\sqrt{g}$ combination of the particle mass and coupling, for states that couple to right-handed leptons and/or up quarks. |
2406.05180 | Miha Nemevsek | Pietro Baratella, Miha Nemev\v{s}ek, Yutaro Shoji, Katarina
Trailovi\'c, Lorenzo Ubaldi | The Standard Model lifetime is slightly shorter | 5 pages + Supplemental, 2 figures | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We revisit the decay rate of the electroweak vacuum in the Standard Model
with the full one-loop prefactor. We focus on the gauge degrees of freedom and
derive the degeneracy factors appearing in the functional determinant using
group theoretical arguments. Our treatment shows that the transverse modes were
previously overcounted, so we revise the calculation of that part of the
prefactor. The new result modifies the gauge fields' contribution by $7\%$ and
slightly decreases the previously predicted lifetime of the electroweak vacuum,
which remains much longer than the age of the universe. Our discussion of the
transverse mode degeneracy applies to any calculation of functional
determinants involving gauge fields in four dimensions.
| [
{
"created": "Fri, 7 Jun 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-06-11 | [
[
"Baratella",
"Pietro",
""
],
[
"Nemevšek",
"Miha",
""
],
[
"Shoji",
"Yutaro",
""
],
[
"Trailović",
"Katarina",
""
],
[
"Ubaldi",
"Lorenzo",
""
]
] | We revisit the decay rate of the electroweak vacuum in the Standard Model with the full one-loop prefactor. We focus on the gauge degrees of freedom and derive the degeneracy factors appearing in the functional determinant using group theoretical arguments. Our treatment shows that the transverse modes were previously overcounted, so we revise the calculation of that part of the prefactor. The new result modifies the gauge fields' contribution by $7\%$ and slightly decreases the previously predicted lifetime of the electroweak vacuum, which remains much longer than the age of the universe. Our discussion of the transverse mode degeneracy applies to any calculation of functional determinants involving gauge fields in four dimensions. |
hep-ph/9610491 | Nicos Stefanis | N. G. Stefanis, A. I. Karanikas, and C. N. Ktorides | Worldline description of the Isgur-Wise function | LaTeX, using Worldstyle and comprising three eps files (5 pages in
total). Invited talk presented by the first author at the International
Workshop Quark Confinement and the Hadron Spectrum II, June 26-29, 1996,
Villa Olmo, Como, Italy. To appear in the Proceedings (World Scientific) | null | null | RUB-TPII-11-96 (July 1996) | hep-ph | null | An effective field theoretic description of the Isgur-Wise function in
heavy-meson transitions is presented which emulates soft interactions by a
fermion worldline with an infinitesimal self-intersecting loop. A
point-splitting regularization technique is used, which replaces pointlike
worldlines by ``ribbons'' in the sense of Witten. The calculated vertex
function is correctly normalized, does not depend on the heavy-quark mass, and
complies with different sets of recent experimental data of the ARGUS and CLEO
collaborations.
| [
{
"created": "Fri, 25 Oct 1996 14:57:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stefanis",
"N. G.",
""
],
[
"Karanikas",
"A. I.",
""
],
[
"Ktorides",
"C. N.",
""
]
] | An effective field theoretic description of the Isgur-Wise function in heavy-meson transitions is presented which emulates soft interactions by a fermion worldline with an infinitesimal self-intersecting loop. A point-splitting regularization technique is used, which replaces pointlike worldlines by ``ribbons'' in the sense of Witten. The calculated vertex function is correctly normalized, does not depend on the heavy-quark mass, and complies with different sets of recent experimental data of the ARGUS and CLEO collaborations. |
hep-ph/9801356 | A. A. Penin | J.H.K\"uhn, A.A.Penin and A.A.Pivovarov | Coulomb resummation for $b \bar b$ system near threshold and precision
determination of $\al_s$ and $m_b$. | 22 pages Latex, some misprints in the Appendix are corrected | Nucl.Phys.B534:356-370,1998 | 10.1016/S0550-3213(98)00607-5 | preprint TTP98-01 | hep-ph | null | We analyze sum rules for the $\Upsilon$ system with resummation of threshold
effects on the basis of the nonrelativistic Coulomb approximation. We find for
the pole mass of the bottom quark $m_b=4.75\pm 0.04 GeV$ and for the strong
coupling constant $\al_s(M_Z)=0.118\pm 0.006$. The origin of the contradiction
between two recent estimates obtained within the same formal framework is
clarified.
| [
{
"created": "Tue, 20 Jan 1998 11:06:55 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Feb 1998 14:57:54 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Feb 1998 09:10:43 GMT",
"version": "v3"
},
{
"created": "Sun, 5 Apr 1998 12:51:35 GMT",
"version": "v4"
}
] | 2016-08-15 | [
[
"Kühn",
"J. H.",
""
],
[
"Penin",
"A. A.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] | We analyze sum rules for the $\Upsilon$ system with resummation of threshold effects on the basis of the nonrelativistic Coulomb approximation. We find for the pole mass of the bottom quark $m_b=4.75\pm 0.04 GeV$ and for the strong coupling constant $\al_s(M_Z)=0.118\pm 0.006$. The origin of the contradiction between two recent estimates obtained within the same formal framework is clarified. |
0706.2168 | Mu-Chun Chen | Mu-Chun Chen | Models of Neutrino Masses and Mixing | Talk presented at the 2nd International Colliders to Cosmic Rays
Conference (C2CR07), Lake Tahoe, CA, February 25 - March 1, 2007; 8 pages; 2
figures | AIPConf.Proc.928:153-160,2007 | 10.1063/1.2775909 | UCI-TR-2007-27, FERMILAB-CONF-07-200-T | hep-ph | null | Neutrino physics has entered an era of precision measurements. With these
precise measurements, we may be able to distinguish different models that have
been constructed to explain the small neutrino masses and the large mixing
among them. In this talk, I review some of the existing theoretical models and
their predictions for neutrino oscillations.
| [
{
"created": "Thu, 14 Jun 2007 17:45:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chen",
"Mu-Chun",
""
]
] | Neutrino physics has entered an era of precision measurements. With these precise measurements, we may be able to distinguish different models that have been constructed to explain the small neutrino masses and the large mixing among them. In this talk, I review some of the existing theoretical models and their predictions for neutrino oscillations. |
1205.0521 | Ulrich Jentschura | U. D. Jentschura and B. J. Wundt | From Generalized Dirac Equations to a Candidate for Dark Energy | 26 pages; RevTeX; 1 figure; some typographical errors corrected in
Sec. 5C; Version 6: typographical error in Eq.(3.3b) corrected; reference
[39] updated; ISRN High Energy Physics, in press | ISRN High Energy Physics 2013 (2013) 374612 | 10.1155/2013/374612 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider extensions of the Dirac equation with mass terms m1+i*gamma5*m2
and i*m_1+gamma*m2. The corresponding Hamiltonians are Hermitian and
pseudo-Hermitian ("gamma5 Hermitian"), respectively. The fundamental spinor
solutions for all generalized Dirac equations are found in the helicity basis
and brought into concise analytic form. We postulate that the time-ordered
product of field operators should yield the Feynman propagator (i*epsilon
prescription), and we also postulate that the tardyonic as well as tachyonic
Dirac equations should have a smooth massless limit. These postulates lead to
sum rules that connect the form of the fundamental field anticommutators with
the tensor sums of the fundamental plane-wave eigenspinors and the projectors
over positive-energy and negative-energy states. In the massless case, the sum
rules are fulfilled by two egregiously simple, distinguished functional forms.
The first sum rule remains valid in the case of a tardyonic theory and leads to
the canonical massive Dirac field. The second sum rule is valid for a tachyonic
mass term and leads to a natural suppression of the right-handed helicity
states for tachyonic particles, and left-handed helicity states for tachyonic
spin-1/2 antiparticles. When applied to neutrinos, the theory contains a free
tachyonic mass parameter. Tachyons are known to be repulsed by gravity. We
discuss a possible role of a tachyonic neutrino as a contribution to the
accelerated expansion of the Universe ("dark energy").
| [
{
"created": "Wed, 2 May 2012 18:49:00 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jun 2012 21:25:31 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Aug 2012 14:47:18 GMT",
"version": "v3"
},
{
"created": "Wed, 3 Oct 2012 10:42:02 GMT",
"version": "v4"
},
{
"created": "Fri, 16 Nov 2012 16:02:11 GMT",
"version": "v5"
},
{
"created": "Wed, 12 Dec 2012 19:09:40 GMT",
"version": "v6"
}
] | 2013-03-11 | [
[
"Jentschura",
"U. D.",
""
],
[
"Wundt",
"B. J.",
""
]
] | We consider extensions of the Dirac equation with mass terms m1+i*gamma5*m2 and i*m_1+gamma*m2. The corresponding Hamiltonians are Hermitian and pseudo-Hermitian ("gamma5 Hermitian"), respectively. The fundamental spinor solutions for all generalized Dirac equations are found in the helicity basis and brought into concise analytic form. We postulate that the time-ordered product of field operators should yield the Feynman propagator (i*epsilon prescription), and we also postulate that the tardyonic as well as tachyonic Dirac equations should have a smooth massless limit. These postulates lead to sum rules that connect the form of the fundamental field anticommutators with the tensor sums of the fundamental plane-wave eigenspinors and the projectors over positive-energy and negative-energy states. In the massless case, the sum rules are fulfilled by two egregiously simple, distinguished functional forms. The first sum rule remains valid in the case of a tardyonic theory and leads to the canonical massive Dirac field. The second sum rule is valid for a tachyonic mass term and leads to a natural suppression of the right-handed helicity states for tachyonic particles, and left-handed helicity states for tachyonic spin-1/2 antiparticles. When applied to neutrinos, the theory contains a free tachyonic mass parameter. Tachyons are known to be repulsed by gravity. We discuss a possible role of a tachyonic neutrino as a contribution to the accelerated expansion of the Universe ("dark energy"). |
hep-ph/9912441 | Catherine Eguren | Fabian Zomer | Inclusive Deep Inelastic Scattering at HERA and related phenomenology | 14 pages | null | null | LAL 99-69 | hep-ph | null | Recent measurements of inclusive deep inelastic scattering differential
cross-section in the range 1.5 \gev2\le Q^2\le 30000 \gev2 and 5\cdot
10^{-6}\le x\le 0.65 are presented. Phenomenological analyses performed from
these measurements are also described.
| [
{
"created": "Tue, 21 Dec 1999 12:50:07 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jan 2000 10:08:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Zomer",
"Fabian",
""
]
] | Recent measurements of inclusive deep inelastic scattering differential cross-section in the range 1.5 \gev2\le Q^2\le 30000 \gev2 and 5\cdot 10^{-6}\le x\le 0.65 are presented. Phenomenological analyses performed from these measurements are also described. |
1506.05799 | Ahmed Ismail | M. Cahill-Rowley, J.L. Hewett, A. Ismail, and T.G. Rizzo | The ATLAS Z + MET Excess in the MSSM | 20 pages, 11 figures | Phys. Rev. D 92, 075029 (2015) | 10.1103/PhysRevD.92.075029 | SLAC-PUB-16308 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the $3\sigma$ excess observed by ATLAS in the Z + MET
channel can be explained within the context of the MSSM. Using the freedom
inherent in the pMSSM, we perform a detailed analysis of the parameter space
and find a scenario that describes the excess while simultaneously complying
with all other search constraints from the Run I data at 7 and 8 TeV, including
the Z + MET analysis by CMS. We generate a small sample of simplified models,
using promising models from our existing pMSSM sample as seeds, and study their
properties. The successful region is described by the production of 1st/2nd
generation squark pairs, followed by their decay into a bino-like neutralino
which in turn decays into a Higgsino-like LSP triplet by emitting a Z boson,
i.e., $\tilde q\to\tilde B\to\tilde h$ with $\tilde q = \tilde Q_L,\tilde u_R,$
or $\tilde d_R$. The sweet spot for the sparticle spectrum is found to have
squark masses in the 500-750 GeV range, with bino masses near 350 GeV with a
mass splitting of 150-200 GeV with the Higgsino LSP. If this excess holds, then
this scenario predicts that a signal will be observed in the 0l + jets and/or
1l + jets searches in the early operations of Run II.
| [
{
"created": "Thu, 18 Jun 2015 20:00:24 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Cahill-Rowley",
"M.",
""
],
[
"Hewett",
"J. L.",
""
],
[
"Ismail",
"A.",
""
],
[
"Rizzo",
"T. G.",
""
]
] | We demonstrate that the $3\sigma$ excess observed by ATLAS in the Z + MET channel can be explained within the context of the MSSM. Using the freedom inherent in the pMSSM, we perform a detailed analysis of the parameter space and find a scenario that describes the excess while simultaneously complying with all other search constraints from the Run I data at 7 and 8 TeV, including the Z + MET analysis by CMS. We generate a small sample of simplified models, using promising models from our existing pMSSM sample as seeds, and study their properties. The successful region is described by the production of 1st/2nd generation squark pairs, followed by their decay into a bino-like neutralino which in turn decays into a Higgsino-like LSP triplet by emitting a Z boson, i.e., $\tilde q\to\tilde B\to\tilde h$ with $\tilde q = \tilde Q_L,\tilde u_R,$ or $\tilde d_R$. The sweet spot for the sparticle spectrum is found to have squark masses in the 500-750 GeV range, with bino masses near 350 GeV with a mass splitting of 150-200 GeV with the Higgsino LSP. If this excess holds, then this scenario predicts that a signal will be observed in the 0l + jets and/or 1l + jets searches in the early operations of Run II. |
hep-ph/9706230 | Lisi Eligio | G.L. Fogli, E. Lisi, D. Montanino, G. Scioscia (Bari U. & INFN, Bari) | Reconciling solar and terrestrial neutrino oscillation evidences with
minimum sacrifice | 16 pages (RevTeX) + 3 figures (postscript); requires epsfig.sty | Phys.Rev.D56:4365-4373,1997 | 10.1103/PhysRevD.56.4365 | BARI-TH/273-97 | hep-ph | null | The present possible evidences in favor of neutrino masses and mixings from
solar, atmospheric, and accelerator experiments cannot be all reconciled in a
three-family framework, unless some data are excluded. We grade all possible
three-family scenarios according to their compatibility with the available
data. A recently proposed scenario appears to emerge naturally as the most
likely solution to all oscillation evidences, with the only exception of the
angular dependence of multi-GeV atmospheric data in the Kamiokande experiment.
We describe in detail the status and the phenomenological implications of this
``minimum sacrifice'' solution.
| [
{
"created": "Tue, 3 Jun 1997 14:24:32 GMT",
"version": "v1"
}
] | 2009-10-07 | [
[
"Fogli",
"G. L.",
"",
"Bari U. & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"Bari U. & INFN, Bari"
],
[
"Montanino",
"D.",
"",
"Bari U. & INFN, Bari"
],
[
"Scioscia",
"G.",
"",
"Bari U. & INFN, Bari"
]
] | The present possible evidences in favor of neutrino masses and mixings from solar, atmospheric, and accelerator experiments cannot be all reconciled in a three-family framework, unless some data are excluded. We grade all possible three-family scenarios according to their compatibility with the available data. A recently proposed scenario appears to emerge naturally as the most likely solution to all oscillation evidences, with the only exception of the angular dependence of multi-GeV atmospheric data in the Kamiokande experiment. We describe in detail the status and the phenomenological implications of this ``minimum sacrifice'' solution. |
hep-ph/9611323 | Mikhail Krivoruchenko | M. I. Krivoruchenko (ITEP) | Explicit Solutions to the Unitarity Relations for Isovector Nucleon Form
Factors | Talk given at the 6-th International Symposium on Meson-Nucleon
Physics and the Structure of the Nucleon, Blaubeuren/Tuebingen, 10-14 July,
1995; published in PiN Newsletter, 10 (1995) 156 | PiN Newslett.10:156-158,1995 | null | null | hep-ph | null | The explicit one-dimensional integral representations for isovector nucleon
form factors are constructed by solving the unitarity relations in terms of the
pion form factor and imaginary parts of the t-channel p-wave $\pi N$-scattering
amplitudes. The possibility of computation of the high-energy parts of the
integrals with the use of the information on the low-energy real parts of the
$\pi N$-scattering amplitudes is discussed.
| [
{
"created": "Thu, 14 Nov 1996 10:44:50 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Krivoruchenko",
"M. I.",
"",
"ITEP"
]
] | The explicit one-dimensional integral representations for isovector nucleon form factors are constructed by solving the unitarity relations in terms of the pion form factor and imaginary parts of the t-channel p-wave $\pi N$-scattering amplitudes. The possibility of computation of the high-energy parts of the integrals with the use of the information on the low-energy real parts of the $\pi N$-scattering amplitudes is discussed. |
2101.02225 | Varun Vaidya | Varun Vaidya | Forward scattering in a thermal Plasma | 31 pages | null | null | MIT--CTP 5268 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I examine the regime of forward scattering of an energetic particle in a
Plasma medium in thermal equilibrium. Treating the particle as an open quantum
system interacting with a bath, I look at the time evolution of the reduced
density matrix of the system. The kinematic and dynamical time scales that
emerge can exist in several possible hierarchies which can lead to different
EFT formulations. I show that in certain hierarchies, it becomes necessary to
account for arbitrary number of coherent exchanges between the system and the
bath going beyond the independent scattering paradigm. Analytic results are
obtained in certain limits and the formalism is applied for the measurement of
transverse momentum broadening of a quark in a Quark Gluon Plasma medium.
| [
{
"created": "Wed, 6 Jan 2021 19:00:34 GMT",
"version": "v1"
}
] | 2021-01-08 | [
[
"Vaidya",
"Varun",
""
]
] | I examine the regime of forward scattering of an energetic particle in a Plasma medium in thermal equilibrium. Treating the particle as an open quantum system interacting with a bath, I look at the time evolution of the reduced density matrix of the system. The kinematic and dynamical time scales that emerge can exist in several possible hierarchies which can lead to different EFT formulations. I show that in certain hierarchies, it becomes necessary to account for arbitrary number of coherent exchanges between the system and the bath going beyond the independent scattering paradigm. Analytic results are obtained in certain limits and the formalism is applied for the measurement of transverse momentum broadening of a quark in a Quark Gluon Plasma medium. |
hep-ph/0611209 | Gary Steigman | Gary Steigman | BBN And The CBR Probe The Early Universe | 8 pages, 4 figures; to appear in Proceedings of SUSY06, the 14th
International Conference on Supersymmetry and the Unification of Fundamental
Interactions, UC Irvine, California, 12-17 June 2006" | AIPConf.Proc.903:40-47,2007 | 10.1063/1.2735129 | null | hep-ph astro-ph nucl-th | null | Big Bang Nucleosynthesis (BBN) and the Cosmic Background Radiation (CBR)
provide complementary probes of the early evolution of the Universe and of its
particle content. Neutrinos play important roles in both cases, influencing the
primordial abundances of the nuclides produced by BBN during the first 20
minutes, as well as the spectrum of temperature fluctuations imprinted on the
CBR when the Universe is some 400 thousand years old. The physical effects
relevant at these widely separated epochs are reviewed and the theoretical
predictions are compared with observational data to explore the consistency of
the standard models of cosmology and particle physics and to constrain
beyond-the-standard-model physics and cosmology.
| [
{
"created": "Wed, 15 Nov 2006 19:34:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Steigman",
"Gary",
""
]
] | Big Bang Nucleosynthesis (BBN) and the Cosmic Background Radiation (CBR) provide complementary probes of the early evolution of the Universe and of its particle content. Neutrinos play important roles in both cases, influencing the primordial abundances of the nuclides produced by BBN during the first 20 minutes, as well as the spectrum of temperature fluctuations imprinted on the CBR when the Universe is some 400 thousand years old. The physical effects relevant at these widely separated epochs are reviewed and the theoretical predictions are compared with observational data to explore the consistency of the standard models of cosmology and particle physics and to constrain beyond-the-standard-model physics and cosmology. |
1510.00965 | Nejc Ko\v{s}nik | Svjetlana Fajfer, Nejc Ko\v{s}nik | Prospects of discovering new physics in rare charm decays | 13 pages, 3 figures, typos fixed | null | 10.1140/epjc/s10052-015-3801-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHCb bounds on the branching ratio of rare decay $D^0 \to \mu^+ \mu^-$
and the constraints on the branching ratio of $D^+ \to \pi^+ \mu^+ \mu^-$ in
the nonresonant regions enable us to improve constraints on new physics
contributions. Using the effective Lagrangian approach we determine sizes of
the Wilson coefficients allowed by the existing LHCb bounds on rare charm
decays. Then we discuss contributions to rare charm meson decay observables in
several models of new physics: a model with an additional spin-1 weak triplet,
leptoquark models, Two Higgs doublets model of type III, and a $Z'$ model. Here
we complement the discussion by $D^0 - \bar D^0$ oscillations data. Among
considered models, only leptoquarks can significantly modify Wilson
coefficients. Assuming that the differential decay width for $D^+ \to \pi^+
\mu^+ \mu^-$ receives NP contribution, while the differential decay width for
$D^+ \to \pi^+ e^+ e^-$ is Standard Model-like, we find that lepton flavor
universality can be violated and might be observed at high dilepton invariant
mass.
| [
{
"created": "Sun, 4 Oct 2015 18:36:30 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Oct 2015 10:41:09 GMT",
"version": "v2"
},
{
"created": "Fri, 21 May 2021 13:00:32 GMT",
"version": "v3"
}
] | 2021-05-24 | [
[
"Fajfer",
"Svjetlana",
""
],
[
"Košnik",
"Nejc",
""
]
] | The LHCb bounds on the branching ratio of rare decay $D^0 \to \mu^+ \mu^-$ and the constraints on the branching ratio of $D^+ \to \pi^+ \mu^+ \mu^-$ in the nonresonant regions enable us to improve constraints on new physics contributions. Using the effective Lagrangian approach we determine sizes of the Wilson coefficients allowed by the existing LHCb bounds on rare charm decays. Then we discuss contributions to rare charm meson decay observables in several models of new physics: a model with an additional spin-1 weak triplet, leptoquark models, Two Higgs doublets model of type III, and a $Z'$ model. Here we complement the discussion by $D^0 - \bar D^0$ oscillations data. Among considered models, only leptoquarks can significantly modify Wilson coefficients. Assuming that the differential decay width for $D^+ \to \pi^+ \mu^+ \mu^-$ receives NP contribution, while the differential decay width for $D^+ \to \pi^+ e^+ e^-$ is Standard Model-like, we find that lepton flavor universality can be violated and might be observed at high dilepton invariant mass. |
1508.00912 | Stephen P. Martin | Stephen P. Martin | Four-loop Standard Model effective potential at leading order in QCD | 15 pages | Phys. Rev. D 92, 054029 (2015) | 10.1103/PhysRevD.92.054029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The leading QCD part of the four-loop contribution to the effective potential
for the Standard Model Higgs field is found. As a byproduct, I also find the
corresponding contribution to the four-loop beta function of the Higgs
self-interaction coupling.
| [
{
"created": "Tue, 4 Aug 2015 20:24:55 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Martin",
"Stephen P.",
""
]
] | The leading QCD part of the four-loop contribution to the effective potential for the Standard Model Higgs field is found. As a byproduct, I also find the corresponding contribution to the four-loop beta function of the Higgs self-interaction coupling. |
2211.14341 | Martin Beneke | Martin Beneke, Stefan Lederer, Clara Peset | Electroweak resummation of neutralino dark-matter annihilation into
high-energy photons | 31 pages, 3 figures | null | 10.1007/JHEP01(2023)171 | TUM-HEP-1426/22 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the resummation of large electroweak Sudakov logarithms for the
annihilation of neutralino DM with $\mathcal{O}$(TeV) mass to high-energy
photons in the minimal supersymmetric standard model, extending previous work
on the minimal wino and Higgsino models. We find that NLL resummation reduces
the yield of photons by about $20\%$ for Higgsino-dominated DM at masses around
1~TeV, and up to $45\%$ for neutralinos with larger wino admixture at heavier
masses near 3~TeV. This sizable effect is relevant when observations or
exclusion limits are translated into MSSM parameter-space constraints.
| [
{
"created": "Fri, 25 Nov 2022 19:00:58 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Beneke",
"Martin",
""
],
[
"Lederer",
"Stefan",
""
],
[
"Peset",
"Clara",
""
]
] | We consider the resummation of large electroweak Sudakov logarithms for the annihilation of neutralino DM with $\mathcal{O}$(TeV) mass to high-energy photons in the minimal supersymmetric standard model, extending previous work on the minimal wino and Higgsino models. We find that NLL resummation reduces the yield of photons by about $20\%$ for Higgsino-dominated DM at masses around 1~TeV, and up to $45\%$ for neutralinos with larger wino admixture at heavier masses near 3~TeV. This sizable effect is relevant when observations or exclusion limits are translated into MSSM parameter-space constraints. |
1203.2387 | Robert Foot | R. Foot | Mirror dark matter interpretations of the DAMA, CoGeNT and CRESST-II
data | 20 pages, minor changes, a minor mistake fixed | null | 10.1103/PhysRevD.86.023524 | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CRESST-II collaboration have announced evidence for the direct detection
of dark matter in 730 kg-days exposure of a CaWO$_4$ target. We examine these
new results, along with DAMA and CoGeNT data, in the context of the mirror dark
matter framework. We show that all three experiments can be simultaneously
explained via kinetic mixing induced elastic scattering of a mirror metal
component off target nuclei. This metal component can be as heavy as Fe$'$ if
the galactic rotational velocity is relatively low: $v_{rot} \stackrel{<}{\sim}
220$ km/s. This explanation is consistent with the constraints from the other
experiments, such as CDMS/Ge, CDMS/Si and XENON100 when modest $\sim 20-30%$
uncertainties in energy scale are considered.
| [
{
"created": "Mon, 12 Mar 2012 00:26:24 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2012 02:47:09 GMT",
"version": "v2"
},
{
"created": "Sat, 18 May 2013 04:41:42 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Foot",
"R.",
""
]
] | The CRESST-II collaboration have announced evidence for the direct detection of dark matter in 730 kg-days exposure of a CaWO$_4$ target. We examine these new results, along with DAMA and CoGeNT data, in the context of the mirror dark matter framework. We show that all three experiments can be simultaneously explained via kinetic mixing induced elastic scattering of a mirror metal component off target nuclei. This metal component can be as heavy as Fe$'$ if the galactic rotational velocity is relatively low: $v_{rot} \stackrel{<}{\sim} 220$ km/s. This explanation is consistent with the constraints from the other experiments, such as CDMS/Ge, CDMS/Si and XENON100 when modest $\sim 20-30%$ uncertainties in energy scale are considered. |
hep-ph/0407313 | Vladimir Pascalutsa | Vladimir Pascalutsa (JLab & W&M College), Barry R. Holstein (JLab &
UMass), Marc Vanderhaeghen (JLab & W&M College) | A Derivative of the Gerasimov-Drell-Hearn Sum Rule | 11 pages, 5 figures, minor corrections, published version | Phys.Lett.B600:239-247,2004 | 10.1016/j.physletb.2004.09.006 | WM-04-111, JLAB-THY-04-250 | hep-ph hep-th nucl-th | null | We derive a sum rule which establishes a linear relation between a particle's
anomalous magnetic moment and a quantity connected to the photoabsorption
cross-section. This quantity cannot be measured directly. However, it can be
computed within a given theory. As an example, we demonstrate validity of the
sum rule in QED at tree level--the renowned Schwinger's correction to the
anomalous magnetic moment is readily reproduced. In the case of the strong
interactions, we also consider the calculation of the nucleon magnetic moment
within chiral theories.
| [
{
"created": "Tue, 27 Jul 2004 21:03:05 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2004 16:05:37 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Sep 2004 00:39:58 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Pascalutsa",
"Vladimir",
"",
"JLab & W&M College"
],
[
"Holstein",
"Barry R.",
"",
"JLab &\n UMass"
],
[
"Vanderhaeghen",
"Marc",
"",
"JLab & W&M College"
]
] | We derive a sum rule which establishes a linear relation between a particle's anomalous magnetic moment and a quantity connected to the photoabsorption cross-section. This quantity cannot be measured directly. However, it can be computed within a given theory. As an example, we demonstrate validity of the sum rule in QED at tree level--the renowned Schwinger's correction to the anomalous magnetic moment is readily reproduced. In the case of the strong interactions, we also consider the calculation of the nucleon magnetic moment within chiral theories. |
0801.3349 | Wei Zhu | Jianhong Ruan, Zhenqi Shen and Wei Zhu | Nuclear Shadowing and Antishadowing in a Unitarized BFKL Equation | 19 pages, 6 figures, to be appeared in Chinese Physics C | null | 10.1088/1674-1137/32/9/009 | null | hep-ph | null | The nuclear shadowing and antishadowing effects are explained by a unitarized
BFKL equation. The $Q^2$- and $x$-variations of the nuclear parton
distributions are detailed based on the level of the unintegrated gluon
distribution. In particular, the asymptotical behavior of the unintegrated
gluon distribution near the saturation limit in nuclear targets is studied. Our
results in the nuclear targets are insensitive to the input distributions if
the parameters are fixed by the data of a free proton.
| [
{
"created": "Tue, 22 Jan 2008 11:46:57 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Ruan",
"Jianhong",
""
],
[
"Shen",
"Zhenqi",
""
],
[
"Zhu",
"Wei",
""
]
] | The nuclear shadowing and antishadowing effects are explained by a unitarized BFKL equation. The $Q^2$- and $x$-variations of the nuclear parton distributions are detailed based on the level of the unintegrated gluon distribution. In particular, the asymptotical behavior of the unintegrated gluon distribution near the saturation limit in nuclear targets is studied. Our results in the nuclear targets are insensitive to the input distributions if the parameters are fixed by the data of a free proton. |
1610.06299 | Agustin Moyotl-Acuahuitl Mr. | A. Moyotl, S. Chamorro-Solano, H. Castilla-Valdez and M. A. P\'erez | New physics effects in the Higgs trilinear self-coupling through
one-loop radiative corrections | 15 pages, 9 figures, 1 table, Revised version, we include appendices
with further technical details on our renormalization scheme, some references
added and minor typos corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the one-loop corrections to the triple Higgs self-interaction
$hhh$ in the framework of the Standard Model (SM), the Two Higgs Doublet Model
type III (THDM-III) and the Littlest Higgs Model with T parity (LHBM+T). Our
results are compared with previous results for the SM. In particular, we find
that an imaginary part for the $\lambda_{hhh}$ form factor is induced when one
of the Higgs boson legs is off-mass shell with 4-momentum magnitude higher than
the Higgs boson mass. This contribution is sensitive to virtual effects of the
Higgs self-interaction, that induces a radiative correction to the $hhh$
coupling of order 11%. However, the radiative corrections associated to the new
degrees of freedom of the THDM-III and the LHBM+T are rather smaller and
comparable to the $W^\pm$ and $Z^0$ gauge bosons one-loop corrections.
| [
{
"created": "Thu, 20 Oct 2016 06:26:43 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2016 06:51:21 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Nov 2017 23:08:22 GMT",
"version": "v3"
}
] | 2017-11-29 | [
[
"Moyotl",
"A.",
""
],
[
"Chamorro-Solano",
"S.",
""
],
[
"Castilla-Valdez",
"H.",
""
],
[
"Pérez",
"M. A.",
""
]
] | We compute the one-loop corrections to the triple Higgs self-interaction $hhh$ in the framework of the Standard Model (SM), the Two Higgs Doublet Model type III (THDM-III) and the Littlest Higgs Model with T parity (LHBM+T). Our results are compared with previous results for the SM. In particular, we find that an imaginary part for the $\lambda_{hhh}$ form factor is induced when one of the Higgs boson legs is off-mass shell with 4-momentum magnitude higher than the Higgs boson mass. This contribution is sensitive to virtual effects of the Higgs self-interaction, that induces a radiative correction to the $hhh$ coupling of order 11%. However, the radiative corrections associated to the new degrees of freedom of the THDM-III and the LHBM+T are rather smaller and comparable to the $W^\pm$ and $Z^0$ gauge bosons one-loop corrections. |
2305.13061 | Thomas Blackburn | T. G. Blackburn, B. King, S. Tang | Simulations of laser-driven strong-field QED with Ptarmigan: Resolving
wavelength-scale interference and $\gamma$-ray polarization | 19 pages, 6 figures; additional discussion of validity and updated
figures; to appear in Physics of Plasmas | Phys. Plasmas 30, 093903 (2023) | 10.1063/5.0159963 | null | hep-ph physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate modelling is necessary to support precision experiments
investigating strong-field QED phenomena. This modelling is particularly
challenging in the transition between the perturbative and nonperturbative
regimes, where the normalized laser amplitude $a_0$ is comparable to unity and
wavelength-scale interference is significant. Here we describe how to simulate
nonlinear Compton scattering, Breit-Wheeler pair creation, and trident pair
creation in this regime, using the Monte Carlo particle-tracking code
Ptarmigan. This code simulates collisions between high-intensity lasers and
beams of electrons or $\gamma$ rays, primarily in the framework of the locally
monochromatic approximation (LMA). We benchmark our simulation results against
full QED calculations for pulsed plane waves and show that they are accurate at
the level of a few per cent, across the full range of particle energies and
laser intensities. This work extends our previous results to linearly polarized
lasers and arbitrarily polarized $\gamma$ rays.
| [
{
"created": "Mon, 22 May 2023 14:20:41 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Sep 2023 11:23:20 GMT",
"version": "v2"
}
] | 2023-09-21 | [
[
"Blackburn",
"T. G.",
""
],
[
"King",
"B.",
""
],
[
"Tang",
"S.",
""
]
] | Accurate modelling is necessary to support precision experiments investigating strong-field QED phenomena. This modelling is particularly challenging in the transition between the perturbative and nonperturbative regimes, where the normalized laser amplitude $a_0$ is comparable to unity and wavelength-scale interference is significant. Here we describe how to simulate nonlinear Compton scattering, Breit-Wheeler pair creation, and trident pair creation in this regime, using the Monte Carlo particle-tracking code Ptarmigan. This code simulates collisions between high-intensity lasers and beams of electrons or $\gamma$ rays, primarily in the framework of the locally monochromatic approximation (LMA). We benchmark our simulation results against full QED calculations for pulsed plane waves and show that they are accurate at the level of a few per cent, across the full range of particle energies and laser intensities. This work extends our previous results to linearly polarized lasers and arbitrarily polarized $\gamma$ rays. |
2107.02225 | Meijian Li | Meijian Li, Tuomas Lappi, Xingbo Zhao | Scattering and gluon emission in a color field: a light-front
Hamiltonian approach | null | Phys. Rev. D104, 056014 (2021) | 10.1103/PhysRevD.104.056014 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We develop a numerical method to nonperturbatively study scattering and gluon
emission of a quark from a colored target using a light-front Hamiltonian
approach. The target is described as a classical color field, as in the Color
Glass Condensate effective theory. The Fock space of the scattering system is
restricted to the $\ket{q}+\ket{qg}$ sectors, but the time evolution of this
truncated system is solved exactly. This method allows us to study the
interplay between coherence and multiple scattering in gluon emission. It could
be applied both to studying subeikonal effects in high energy scattering and to
understanding jet quenching in a hot plasma.
| [
{
"created": "Mon, 5 Jul 2021 18:48:43 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Nov 2021 10:45:20 GMT",
"version": "v2"
}
] | 2021-11-16 | [
[
"Li",
"Meijian",
""
],
[
"Lappi",
"Tuomas",
""
],
[
"Zhao",
"Xingbo",
""
]
] | We develop a numerical method to nonperturbatively study scattering and gluon emission of a quark from a colored target using a light-front Hamiltonian approach. The target is described as a classical color field, as in the Color Glass Condensate effective theory. The Fock space of the scattering system is restricted to the $\ket{q}+\ket{qg}$ sectors, but the time evolution of this truncated system is solved exactly. This method allows us to study the interplay between coherence and multiple scattering in gluon emission. It could be applied both to studying subeikonal effects in high energy scattering and to understanding jet quenching in a hot plasma. |
2405.08081 | Giovani Dalla Valle Garcia | Giovani Dalla Valle Garcia, Felix Kahlhoefer, Maksym Ovchynnikov,
Thomas Schwetz | Not-so-inelastic Dark Matter | 20 pages, 7 figures, appendices | null | null | P3H-24-028, TTP24-011 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Models of inelastic (or pseudo-Dirac) dark matter commonly assume an
accidental symmetry between the left-handed and right-handed mass terms in
order to suppress diagonal couplings. We point out that this symmetry is
unnecessary, because for Majorana fermions the diagonal couplings are not
strongly constrained. Removing the requirement of such an ad-hoc symmetry
instead relaxes the relic density constraint due to additional annihilation
modes. We consider a simple UV-complete model realising this setup and study
constraints from (in)direct detection, beam dump experiments and colliders. We
identify two viable mass regions for the dark matter mass, around a few hundred
MeV and around a few GeV, respectively. The former region will be fully tested
by near-future analyses of NA64 and Belle II data, while the latter turns out
to be challenging to explore even with future experiments.
| [
{
"created": "Mon, 13 May 2024 18:00:41 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Garcia",
"Giovani Dalla Valle",
""
],
[
"Kahlhoefer",
"Felix",
""
],
[
"Ovchynnikov",
"Maksym",
""
],
[
"Schwetz",
"Thomas",
""
]
] | Models of inelastic (or pseudo-Dirac) dark matter commonly assume an accidental symmetry between the left-handed and right-handed mass terms in order to suppress diagonal couplings. We point out that this symmetry is unnecessary, because for Majorana fermions the diagonal couplings are not strongly constrained. Removing the requirement of such an ad-hoc symmetry instead relaxes the relic density constraint due to additional annihilation modes. We consider a simple UV-complete model realising this setup and study constraints from (in)direct detection, beam dump experiments and colliders. We identify two viable mass regions for the dark matter mass, around a few hundred MeV and around a few GeV, respectively. The former region will be fully tested by near-future analyses of NA64 and Belle II data, while the latter turns out to be challenging to explore even with future experiments. |
hep-ph/0606195 | Andrea Bianconi | Andrea Bianconi | A study on the feasibility of a precise measurement of the
$\tau$-dependence of the cross sections for Drell-Yan experiments at moderate
energies | 4 pages, 4 figures, in print on Physical Review D | Phys.Rev.D74:057501,2006 | 10.1103/PhysRevD.74.057501 | null | hep-ph | null | Recently, a reconsideration of Drell-Yan cross sections at moderate energies
and masses has suggested the possibility of relevant enhancements of the cross
sections in some kinematical regions. If confirmed, these predictions could
largely affect the planning of Drell-Yan experiments aimed at transverse spin
measurements after 2010. More in general, the problem is present of a precision
measurement of the $\tau$ dependence of Drell-Yan cross sections. Here we
discuss the feasibility of such a measurement within short time at the COMPASS
apparatus, and its relevance for the PANDA experiment.
| [
{
"created": "Mon, 19 Jun 2006 12:47:52 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2006 08:16:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bianconi",
"Andrea",
""
]
] | Recently, a reconsideration of Drell-Yan cross sections at moderate energies and masses has suggested the possibility of relevant enhancements of the cross sections in some kinematical regions. If confirmed, these predictions could largely affect the planning of Drell-Yan experiments aimed at transverse spin measurements after 2010. More in general, the problem is present of a precision measurement of the $\tau$ dependence of Drell-Yan cross sections. Here we discuss the feasibility of such a measurement within short time at the COMPASS apparatus, and its relevance for the PANDA experiment. |
hep-ph/9711204 | Long Hoang Ngoc | Hoang Ngoc Long | Scalar sector of the 3 3 1 model with three Higgs triplets | 9 pages, latex, no figures | Mod.Phys.Lett.A13:1865-1874,1998 | 10.1142/S0217732398001959 | IC/97/165 | hep-ph | null | A scalar sector of the 3 3 1 model with three Higgs triplets is considered.
The mass spectrum, eigenstates and interactions of the Higgs and the SM gauge
bosons are derived. We show that one of the neutral scalars can be identified
with the standard model Higgs boson, and in the considered potential there is
no mixing between scalars having VEV and ones without VEV.
| [
{
"created": "Mon, 3 Nov 1997 10:06:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Long",
"Hoang Ngoc",
""
]
] | A scalar sector of the 3 3 1 model with three Higgs triplets is considered. The mass spectrum, eigenstates and interactions of the Higgs and the SM gauge bosons are derived. We show that one of the neutral scalars can be identified with the standard model Higgs boson, and in the considered potential there is no mixing between scalars having VEV and ones without VEV. |
hep-ph/0501151 | Laura Tolos | L. Tolos, J. Schaffner-Bielich and A. Mishra | D-mesons in dense nuclear matter | 4 pages, 4 figures, to appear in the proceedings of Hard Probes 2004,
Ericeira, Portugal, November 4-10, 2004 (European Physical Journal C) | Eur.Phys.J.C43:127-130,2005 | 10.1140/epjc/s2005-02254-5 | null | hep-ph nucl-th | null | The D-meson properties in dense nuclear matter are studied. The D-meson
spectral density is obtained within the framework of a coupled-channel
self-consistent calculation assuming, as bare meson-baryon interaction, a
separable potential. The $\Lambda_c(2593)$ resonance is generated dynamically
in our coupled-channel model. The medium modifications of the D-meson
properties due to Pauli blocking and the dressing of D-mesons, nucleons and
pions are also studied. We conclude that the self-consistent coupled-channel
process reduces the in-medium effects on the D-meson compared to previous
literature which do not considered the coupled-channel structure
| [
{
"created": "Mon, 17 Jan 2005 10:55:04 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Tolos",
"L.",
""
],
[
"Schaffner-Bielich",
"J.",
""
],
[
"Mishra",
"A.",
""
]
] | The D-meson properties in dense nuclear matter are studied. The D-meson spectral density is obtained within the framework of a coupled-channel self-consistent calculation assuming, as bare meson-baryon interaction, a separable potential. The $\Lambda_c(2593)$ resonance is generated dynamically in our coupled-channel model. The medium modifications of the D-meson properties due to Pauli blocking and the dressing of D-mesons, nucleons and pions are also studied. We conclude that the self-consistent coupled-channel process reduces the in-medium effects on the D-meson compared to previous literature which do not considered the coupled-channel structure |
1708.04909 | Yufeng Li | Jian Tang, Yibing Zhang, Yu-Feng Li | Probing Direct and Indirect Unitarity Violation in Future Accelerator
Neutrino Facilities | 19 pages, 6 figures | null | 10.1016/j.physletb.2017.09.055 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible existence of light and heavy sterile neutrinos may give rise to
direct and indirect unitarity violation of the $3\times3$ lepton mixing matrix
respectively. In the current work we study the potential of future accelerator
neutrino facilities in probing the unitarity violation effects. Taking DUNE,
T2HK and a low-energy Neutrino Factory (LENF) as working examples of future
accelerator neutrino facilities, we study the distinct effects of direct and
indirect unitarity violation on the discovery reach of the leptonic CP
violation and precision measurements of $\theta_{23}$ in the three neutrino
framework. In addition, constraints on the additional mixing parameters of
direct and indirect unitarity violation are also discussed. Finally, we stress
that the combination of experiments with different oscillation channels,
different neutrino beams and different detector techniques will be an effective
solution to the parameter degeneracy problem and give the robust measurement of
leptonic CP violation even if the direct and indirect unitarity violation are
taken into account.
| [
{
"created": "Wed, 16 Aug 2017 14:31:37 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Tang",
"Jian",
""
],
[
"Zhang",
"Yibing",
""
],
[
"Li",
"Yu-Feng",
""
]
] | The possible existence of light and heavy sterile neutrinos may give rise to direct and indirect unitarity violation of the $3\times3$ lepton mixing matrix respectively. In the current work we study the potential of future accelerator neutrino facilities in probing the unitarity violation effects. Taking DUNE, T2HK and a low-energy Neutrino Factory (LENF) as working examples of future accelerator neutrino facilities, we study the distinct effects of direct and indirect unitarity violation on the discovery reach of the leptonic CP violation and precision measurements of $\theta_{23}$ in the three neutrino framework. In addition, constraints on the additional mixing parameters of direct and indirect unitarity violation are also discussed. Finally, we stress that the combination of experiments with different oscillation channels, different neutrino beams and different detector techniques will be an effective solution to the parameter degeneracy problem and give the robust measurement of leptonic CP violation even if the direct and indirect unitarity violation are taken into account. |
hep-ph/0409096 | Mu-Chun Chen | Mu-Chun Chen and K.T. Mahanthappa | Lepton Flavor Violating Decays, Soft Leptogenesis and SUSY SO(10) | RevTeX, 22 pages, 9 figures; v2: references added, version to appear
in Phys. Rev. D | Phys.Rev. D70 (2004) 113013 | 10.1103/PhysRevD.70.113013 | BNL-HET-04/14, COLO-HEP-502 | hep-ph | null | We investigate lepton flavor violating decays in a SUSY SO(10) model with
symmetric textures recently constructed by us. Unlike the models with lop-sided
textures which give rise to a large decay rate for mu -> e gamma, the decay
rate we get is much suppressed and yet it is large enough to be accessible to
the next generation of experiments. We have also investigated the possibility
of baryogenesis resulting from soft leptogenesis. We find that with the soft
SUSY masses assuming their natural values, B^\prime \equiv \sqrt{BM_{1}} ~ 1.4
TeV and Im(A) ~ 1 TeV, the observed baryon asymmetry in the Universe can be
accommodated in our model. We have also updated the predictions of our model
for the masses, mixing angles and CP violating measures in both charged fermion
and neutrino sectors, using the most up-to-date experimental data as input.
| [
{
"created": "Wed, 8 Sep 2004 19:27:01 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2004 22:05:51 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
]
] | We investigate lepton flavor violating decays in a SUSY SO(10) model with symmetric textures recently constructed by us. Unlike the models with lop-sided textures which give rise to a large decay rate for mu -> e gamma, the decay rate we get is much suppressed and yet it is large enough to be accessible to the next generation of experiments. We have also investigated the possibility of baryogenesis resulting from soft leptogenesis. We find that with the soft SUSY masses assuming their natural values, B^\prime \equiv \sqrt{BM_{1}} ~ 1.4 TeV and Im(A) ~ 1 TeV, the observed baryon asymmetry in the Universe can be accommodated in our model. We have also updated the predictions of our model for the masses, mixing angles and CP violating measures in both charged fermion and neutrino sectors, using the most up-to-date experimental data as input. |
2311.07347 | Shao-Jiang Wang | Jun-Chen Wang, Zi-Yan Yuwen, Yu-Shi Hao, Shao-Jiang Wang | General bubble expansion at strong coupling | v1, 22 pages, 10 figures; v2, two columns, 16 pages, 8 figures,
extended discussion on the difference between phase pressure difference and
wall pressure difference, version accepted for publication in Physical Review
D; v3, to match the published version | Phys. Rev. D 109 (2024) 9, 096012 | 10.1103/PhysRevD.109.096012 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strongly coupled system like the quark-hadron transition (if it is of
first order) is becoming an active play yard for the physics of cosmological
first-order phase transitions. However, the traditional field theoretic
approach to strongly coupled first-order phase transitions is of great
challenge, driving recent efforts from holographic dual theories with explicit
numerical simulations. These holographic numerical simulations have revealed an
intriguing linear correlation between the phase pressure difference (pressure
difference away from the wall) to the nonrelativistic terminal velocity of an
expanding planar wall, which has been reproduced analytically alongside both
cylindrical and spherical walls from perfect-fluid hydrodynamics in our
previous study but only for a bag equation of state. We also found, in our
previous study, a universal quadratic correlation between the wall pressure
difference (pressure difference near the bubble wall) to the nonrelativistic
terminal wall velocity regardless of wall geometries. In this paper, we will
generalize these analytic relations between the phase/wall pressure difference
and terminal wall velocity into a more realistic equation of state beyond the
simple bag model, providing the most general predictions so far for future
tests from holographic numerical simulations of strongly coupled first-order
phase transitions
| [
{
"created": "Mon, 13 Nov 2023 14:05:20 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2024 17:02:42 GMT",
"version": "v2"
},
{
"created": "Sat, 11 May 2024 16:26:11 GMT",
"version": "v3"
}
] | 2024-05-14 | [
[
"Wang",
"Jun-Chen",
""
],
[
"Yuwen",
"Zi-Yan",
""
],
[
"Hao",
"Yu-Shi",
""
],
[
"Wang",
"Shao-Jiang",
""
]
] | The strongly coupled system like the quark-hadron transition (if it is of first order) is becoming an active play yard for the physics of cosmological first-order phase transitions. However, the traditional field theoretic approach to strongly coupled first-order phase transitions is of great challenge, driving recent efforts from holographic dual theories with explicit numerical simulations. These holographic numerical simulations have revealed an intriguing linear correlation between the phase pressure difference (pressure difference away from the wall) to the nonrelativistic terminal velocity of an expanding planar wall, which has been reproduced analytically alongside both cylindrical and spherical walls from perfect-fluid hydrodynamics in our previous study but only for a bag equation of state. We also found, in our previous study, a universal quadratic correlation between the wall pressure difference (pressure difference near the bubble wall) to the nonrelativistic terminal wall velocity regardless of wall geometries. In this paper, we will generalize these analytic relations between the phase/wall pressure difference and terminal wall velocity into a more realistic equation of state beyond the simple bag model, providing the most general predictions so far for future tests from holographic numerical simulations of strongly coupled first-order phase transitions |
hep-ph/9305317 | null | B.K. Jennings (Triumf, 4004 Wesbrook Mall, Vancouver, B.C., V6T 2A3,
Canada) and G.A. Miller (Department of Physics, FM-15, University of
Washington, Seattle, WA, USA) | Natural Color Transparency in High Energy (p,pp) Reactions | latex file, 13 pages, 4 figures appended as ps files, look for "cut
here ..." 1993 Univ. of Washington preprint 404427-00-N93-11 | Phys.Lett.B318:7-13,1993 | 10.1016/0370-2693(93)91774-H | null | hep-ph nucl-th | null | New parameter free calculations including a variety of necessary kinematic
and dynamic effects show that the results of BNL $(p,2p)$ measurements are
consistent with the expectations of color transparency.
| [
{
"created": "Tue, 25 May 1993 23:48:03 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Jennings",
"B. K.",
"",
"Triumf, 4004 Wesbrook Mall, Vancouver, B.C., V6T 2A3,\n Canada"
],
[
"Miller",
"G. A.",
"",
"Department of Physics, FM-15, University of\n Washington, Seattle, WA, USA"
]
] | New parameter free calculations including a variety of necessary kinematic and dynamic effects show that the results of BNL $(p,2p)$ measurements are consistent with the expectations of color transparency. |
hep-ph/9808301 | null | R. N. Mohapatra and S. Nussinov | Gauge Model for Maximal Neutrino Mixing | 6 pages, one figure; References fixed | Phys.Lett. B441 (1998) 299-304 | 10.1016/S0370-2693(98)01169-1 | null | hep-ph | null | The recently announced Super-Kamiokande data on atmospheric neutrino
oscillation seems to require a maximal mixing between the $\nu_{\mu}$ and
$\nu_{\tau}$ within the conventional three neutrino picture. It is then
tempting to suggest as has been done in literature, that the solar neutrino
deficit be also understood as resulting from a maximal mixing between $\nu_e$
and $\nu_{\mu}$. In this letter, we propose a left-right symmetric extension of
the standard model where permutation symmetry leads to one of the maximal
mixing patterns in a technically natural manner. The double seesaw mechanism
gives small Majorana masses for neutrinos needed to understand the atmospheric
as well as the solar neutrino puzzles.
| [
{
"created": "Tue, 11 Aug 1998 18:46:03 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Aug 1998 17:51:21 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Nussinov",
"S.",
""
]
] | The recently announced Super-Kamiokande data on atmospheric neutrino oscillation seems to require a maximal mixing between the $\nu_{\mu}$ and $\nu_{\tau}$ within the conventional three neutrino picture. It is then tempting to suggest as has been done in literature, that the solar neutrino deficit be also understood as resulting from a maximal mixing between $\nu_e$ and $\nu_{\mu}$. In this letter, we propose a left-right symmetric extension of the standard model where permutation symmetry leads to one of the maximal mixing patterns in a technically natural manner. The double seesaw mechanism gives small Majorana masses for neutrinos needed to understand the atmospheric as well as the solar neutrino puzzles. |
1011.1248 | A. H. Rezaeian | Andrey Kormilitzin, Eugene Levin, Amir H. Rezaeian | On the Nuclear Modification Factor at RHIC and LHC | 14 pages, 10 figures; v2: results unchanged, more discussion and
references added. The version to appear in Nucl. Phys. A | Nucl.Phys.A860:84-101,2011 | 10.1016/j.nuclphysa.2011.05.009 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that pQCD factorization incorporated with pre-haronization
energy-loss effect naturally leads to flatness of the nuclear modification
factor R_{AA} for produced hadrons at high transverse momentum p_T. We consider
two possible scenarios for the pre-hadronization: In scenario 1, the produced
gluon propagates through dense QCD medium and loses energy. In scenario 2, all
gluons first decay to quark-antiquark pairs and then each pair loses energy as
propagating through the medium. We show that the estimates of the energy-loss
in these two different models lead to very close values and is able to explain
the suppression of high-p_T hadrons in nucleus-nucleus collisions at RHIC. We
show that the onset of the flatness of R_{AA} for the produced hadron in
central collisions at midrapidity is about p_T\approx 15 and 25 GeV at RHIC and
the LHC energies, respectively. We show that the smallness (R_{AA}<0.5) and the
high-p_T flatness of R_{AA} obtained from the k_T factorization supplemented
with the Balitsky-Kovchegov (BK) equation is rather generic and it does not
strongly depend on the details of the BK solutions. We show that energy-loss
effect reduces the nuclear modification factor obtained from the k_T
factorization about 30\div 50% at moderate p_T.
| [
{
"created": "Thu, 4 Nov 2010 19:49:32 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2011 21:01:01 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Kormilitzin",
"Andrey",
""
],
[
"Levin",
"Eugene",
""
],
[
"Rezaeian",
"Amir H.",
""
]
] | We show that pQCD factorization incorporated with pre-haronization energy-loss effect naturally leads to flatness of the nuclear modification factor R_{AA} for produced hadrons at high transverse momentum p_T. We consider two possible scenarios for the pre-hadronization: In scenario 1, the produced gluon propagates through dense QCD medium and loses energy. In scenario 2, all gluons first decay to quark-antiquark pairs and then each pair loses energy as propagating through the medium. We show that the estimates of the energy-loss in these two different models lead to very close values and is able to explain the suppression of high-p_T hadrons in nucleus-nucleus collisions at RHIC. We show that the onset of the flatness of R_{AA} for the produced hadron in central collisions at midrapidity is about p_T\approx 15 and 25 GeV at RHIC and the LHC energies, respectively. We show that the smallness (R_{AA}<0.5) and the high-p_T flatness of R_{AA} obtained from the k_T factorization supplemented with the Balitsky-Kovchegov (BK) equation is rather generic and it does not strongly depend on the details of the BK solutions. We show that energy-loss effect reduces the nuclear modification factor obtained from the k_T factorization about 30\div 50% at moderate p_T. |
1401.6269 | Xing-Gang Wu | Gu Chen, Xing-Gang Wu, Jia-Wei Zhang, Hua-Yong Han and Hai-Bing Fu | Hadronic production of $\Xi_{cc}$ at a fixed-target experiment at the
LHC | 6 pages, 7 figures. References updated and discussions improved. To
be published in Phys.Rev.D | Phys. Rev. D 89 (2014) 074020 | 10.1103/PhysRevD.89.074020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper, we present a detailed discussion on the $\Xi_{cc}$ production
at a fixed target experiment at the LHC (After@LHC). The doubly charmed baryon
$\Xi_{cc}$ is produced via the channel, ${\rm Proton} + {\rm
Proton}\to\Xi_{cc}+X$. In estimating its hadroproduction, we discuss three
dominant subprocesses, e.g. $g+g\to \Xi_{cc} +\bar{c} +\bar{c}$, $g+c\to
\Xi_{cc}+\bar{c}$ and $c+c\to \Xi_{cc}+g$. During the production, it shall
first generate a binding diquark and then form the $\Xi_{cc}$ baryon by
grabbing soft light-quarks or gluons. We observe that both the two diquark
configurations $(cc)[^3S_1]_{\bf\bar 3}$ and $(cc)[^1S_0]_{\bf 6}$ can have
sizable contributions to the $\Xi_{cc}$ production. Large number of $\Xi_{cc}$
events can be generated at the After@LHC, whose total production cross section
is larger than that of the SELEX experiment by about thirty-five times. It may
also possible to study the properties of $\Xi_{bc}$ at the After@LHC. More
specifically, we shall have about $8.3 \times 10^6$ $\Xi_{cc}$ events/year and
$1.8 \times 10^4$ $\Xi_{bc}$ events/year when its integrated luminosity
approaches to $2$ fb$^{-1}$/year. Thus, in addition to SELEX and LHC, the
After@LHC shall provide another useful platform for studying the baryon
properties.
| [
{
"created": "Fri, 24 Jan 2014 07:07:35 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Mar 2014 17:26:32 GMT",
"version": "v2"
}
] | 2014-04-10 | [
[
"Chen",
"Gu",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Zhang",
"Jia-Wei",
""
],
[
"Han",
"Hua-Yong",
""
],
[
"Fu",
"Hai-Bing",
""
]
] | In the paper, we present a detailed discussion on the $\Xi_{cc}$ production at a fixed target experiment at the LHC (After@LHC). The doubly charmed baryon $\Xi_{cc}$ is produced via the channel, ${\rm Proton} + {\rm Proton}\to\Xi_{cc}+X$. In estimating its hadroproduction, we discuss three dominant subprocesses, e.g. $g+g\to \Xi_{cc} +\bar{c} +\bar{c}$, $g+c\to \Xi_{cc}+\bar{c}$ and $c+c\to \Xi_{cc}+g$. During the production, it shall first generate a binding diquark and then form the $\Xi_{cc}$ baryon by grabbing soft light-quarks or gluons. We observe that both the two diquark configurations $(cc)[^3S_1]_{\bf\bar 3}$ and $(cc)[^1S_0]_{\bf 6}$ can have sizable contributions to the $\Xi_{cc}$ production. Large number of $\Xi_{cc}$ events can be generated at the After@LHC, whose total production cross section is larger than that of the SELEX experiment by about thirty-five times. It may also possible to study the properties of $\Xi_{bc}$ at the After@LHC. More specifically, we shall have about $8.3 \times 10^6$ $\Xi_{cc}$ events/year and $1.8 \times 10^4$ $\Xi_{bc}$ events/year when its integrated luminosity approaches to $2$ fb$^{-1}$/year. Thus, in addition to SELEX and LHC, the After@LHC shall provide another useful platform for studying the baryon properties. |
2107.06625 | Daniel Ma\^itre | Daniel Ma\^itre and Henry Truong | A factorisation-aware Matrix element emulator | 24 pages, 8 figures, v2 accepted for publication in JHEP | null | 10.1007/JHEP11(2021)066 | IPPP/21/11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we present a neural network based model to emulate matrix
elements. This model improves on existing methods by taking advantage of the
known factorisation properties of matrix elements. In so doing we can control
the behaviour of simulated matrix elements when extrapolating into more
singular regions than the ones used for training the neural network. We apply
our model to the case of leading-order jet production in $e^+e^-$ collisions
with up to five jets. Our results show that this model can reproduce the matrix
elements with errors below the one-percent level on the phase-space covered
during fitting and testing, and a robust extrapolation to the parts of the
phase-space where the matrix elements are more singular than seen at the
fitting stage.
| [
{
"created": "Wed, 14 Jul 2021 11:58:47 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 2021 16:07:30 GMT",
"version": "v2"
}
] | 2021-12-01 | [
[
"Maître",
"Daniel",
""
],
[
"Truong",
"Henry",
""
]
] | In this article we present a neural network based model to emulate matrix elements. This model improves on existing methods by taking advantage of the known factorisation properties of matrix elements. In so doing we can control the behaviour of simulated matrix elements when extrapolating into more singular regions than the ones used for training the neural network. We apply our model to the case of leading-order jet production in $e^+e^-$ collisions with up to five jets. Our results show that this model can reproduce the matrix elements with errors below the one-percent level on the phase-space covered during fitting and testing, and a robust extrapolation to the parts of the phase-space where the matrix elements are more singular than seen at the fitting stage. |
1312.5214 | Thomas Hambye | Thomas Hambye | Charged lepton flavor violation and the origin of neutrino masses | Review talk given at the "1st Conference on Charged Lepton Flavor
Violation", May 6-8 2013, Lecce, Italy | null | null | ULB-TH/13-16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino oscillations imply that charged lepton flavor violation (CLFV)
processes do exist. Even if the associated rates are in general expected very
suppressed, it turns out that this is not always necessarily the case. In the
framework of the three basic seesaw models, we review the possibilities of
having observable rates and thus, in this way, of distinguishing these possible
neutrino mass origins.
| [
{
"created": "Wed, 18 Dec 2013 16:40:38 GMT",
"version": "v1"
}
] | 2013-12-19 | [
[
"Hambye",
"Thomas",
""
]
] | The neutrino oscillations imply that charged lepton flavor violation (CLFV) processes do exist. Even if the associated rates are in general expected very suppressed, it turns out that this is not always necessarily the case. In the framework of the three basic seesaw models, we review the possibilities of having observable rates and thus, in this way, of distinguishing these possible neutrino mass origins. |
hep-ph/0306189 | Eun-Joo Ahn | Eun-Joo Ahn, Marco Cavaglia | Cosmic Black Holes | 7 pages. Essay submitted to the 2003 Gravity Research Foundation
essay competition. Received an honorable mention. Accepted for publication in
IJMP D | Int.J.Mod.Phys.D12:1699-1704,2003 | 10.1142/S0218271803004006 | null | hep-ph astro-ph gr-qc hep-th | null | Production of high-energy gravitational objects is a common feature of
gravitational theories. The primordial universe is a natural setting for the
creation of black holes and other nonperturbative gravitational entities.
Cosmic black holes can be used to probe physical properties of the very early
universe which would usually require the knowledge of the theory of quantum
gravity. They may be the only tool to explore thermalisation of the early
universe. Whereas the creation of cosmic black holes was active in the past, it
seems to be negligible at the present epoch.
| [
{
"created": "Fri, 20 Jun 2003 18:52:30 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Ahn",
"Eun-Joo",
""
],
[
"Cavaglia",
"Marco",
""
]
] | Production of high-energy gravitational objects is a common feature of gravitational theories. The primordial universe is a natural setting for the creation of black holes and other nonperturbative gravitational entities. Cosmic black holes can be used to probe physical properties of the very early universe which would usually require the knowledge of the theory of quantum gravity. They may be the only tool to explore thermalisation of the early universe. Whereas the creation of cosmic black holes was active in the past, it seems to be negligible at the present epoch. |
2107.04578 | Kai Schmitz | Wilfried Buchmuller, Valerie Domcke, Kai Schmitz | Stochastic gravitational-wave background from metastable cosmic strings | 31 pages, 6 figures. v2: signal recently reported by the Parkes
Pulsar Timing Array (PPTA) collaboration [2107.12112] added to Figs. 2 to 4 | null | 10.1088/1475-7516/2021/12/006 | CERN-TH-2021-107, DESY 21-101 | hep-ph astro-ph.CO gr-qc | http://creativecommons.org/licenses/by/4.0/ | A metastable cosmic-string network is a generic consequence of many grand
unified theories (GUTs) when combined with cosmic inflation. Metastable cosmic
strings are not topologically stable, but decay on cosmic time scales due to
pair production of GUT monopoles. This leads to a network consisting of
metastable long strings on superhorizon scales as well as of string loops and
segments on subhorizon scales. We compute for the first time the complete
stochastic gravitational-wave background (SGWB) arising from all these network
constituents, including several technical improvements to both the derivation
of the loop and segment contributions. We find that the gravitational waves
emitted by string loops provide the main contribution to the gravitational-wave
spectrum in the relevant parameter space. The resulting spectrum is consistent
with the tentative signal observed by the NANOGrav and Parkes pulsar timing
collaborations for a string tension of G\mu ~ 10^-11...-7 and has ample
discovery space for ground- and space-based detectors. For GUT-scale string
tensions, G\mu ~ 10^-8...-7, metastable strings predict a SGWB in the
LIGO-Virgo-KAGRA band that could be discovered in the near future.
| [
{
"created": "Fri, 9 Jul 2021 17:53:13 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Aug 2021 19:21:53 GMT",
"version": "v2"
}
] | 2021-12-15 | [
[
"Buchmuller",
"Wilfried",
""
],
[
"Domcke",
"Valerie",
""
],
[
"Schmitz",
"Kai",
""
]
] | A metastable cosmic-string network is a generic consequence of many grand unified theories (GUTs) when combined with cosmic inflation. Metastable cosmic strings are not topologically stable, but decay on cosmic time scales due to pair production of GUT monopoles. This leads to a network consisting of metastable long strings on superhorizon scales as well as of string loops and segments on subhorizon scales. We compute for the first time the complete stochastic gravitational-wave background (SGWB) arising from all these network constituents, including several technical improvements to both the derivation of the loop and segment contributions. We find that the gravitational waves emitted by string loops provide the main contribution to the gravitational-wave spectrum in the relevant parameter space. The resulting spectrum is consistent with the tentative signal observed by the NANOGrav and Parkes pulsar timing collaborations for a string tension of G\mu ~ 10^-11...-7 and has ample discovery space for ground- and space-based detectors. For GUT-scale string tensions, G\mu ~ 10^-8...-7, metastable strings predict a SGWB in the LIGO-Virgo-KAGRA band that could be discovered in the near future. |
0907.0859 | Long Hoang Ngoc | P. V. Dong, L. T. Hue, H. T. Hung, H. N. Long, and N. H. Thao | Symmetry Factors of Feynman Diagrams for Scalar Fields | Journal version, new references added | Theor.Math.Phys.165:1500-1511,2010 | 10.1007/s11232-010-0124-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The symmetry factor of Feynman diagrams for real and complex scalar fields is
presented. Being analysis of Wick expansion for Green functions, the mentioned
factor is derived in a general form. The symmetry factor can be separated into
two ones corresponding to that of connected and vacuum diagrams. The
determination of symmetry factors for the vacuum diagrams is necessary as they
play a role in the effective action and phase transitions in cosmology. In the
complex scalar theory the diagrams different in topology may give the same
contribution, hence inverse of the symmetry factor (1/S) for total contribution
is a summation of each similar ones (1/S_i), i.e., 1/S = \sum_i (1/S_i).
| [
{
"created": "Sun, 5 Jul 2009 14:07:05 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Nov 2010 07:23:38 GMT",
"version": "v2"
}
] | 2011-01-17 | [
[
"Dong",
"P. V.",
""
],
[
"Hue",
"L. T.",
""
],
[
"Hung",
"H. T.",
""
],
[
"Long",
"H. N.",
""
],
[
"Thao",
"N. H.",
""
]
] | The symmetry factor of Feynman diagrams for real and complex scalar fields is presented. Being analysis of Wick expansion for Green functions, the mentioned factor is derived in a general form. The symmetry factor can be separated into two ones corresponding to that of connected and vacuum diagrams. The determination of symmetry factors for the vacuum diagrams is necessary as they play a role in the effective action and phase transitions in cosmology. In the complex scalar theory the diagrams different in topology may give the same contribution, hence inverse of the symmetry factor (1/S) for total contribution is a summation of each similar ones (1/S_i), i.e., 1/S = \sum_i (1/S_i). |
hep-ph/0504087 | Junfeng Sun | Gang Hao, Lin Li, Cong-Feng Qiao | Ds+ -- Ds- Asymmetry in Photoproduction | 11 page, 5 figures | Phys.Lett.B621:139-144,2005 | 10.1016/j.physletb.2005.06.057 | null | hep-ph | null | Considering of the possible difference in strange and antistrange quark
distributions inside nucleon, we investigate the Ds+ -- Ds- asymmetry in
photoproduction in the framework of heavy-quark recombination mechanism. We
adopt two distribution models of strange sea, those are the light-cone
meson-baryon fluctuation model and the effective chiral quark model. Our
results show that the asymmetry induced by the strange quark distributions is
distinct, which is measurable in experiments. And, there are evident
differences between the predictions of our calculation and previous estimation.
Therefore, the experimental measurements on the Ds+ -- Ds- asymmetry may impose
a unique restriction on the strange-antistrange distribution asymmetry models.
| [
{
"created": "Tue, 12 Apr 2005 14:50:25 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jun 2005 10:04:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hao",
"Gang",
""
],
[
"Li",
"Lin",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | Considering of the possible difference in strange and antistrange quark distributions inside nucleon, we investigate the Ds+ -- Ds- asymmetry in photoproduction in the framework of heavy-quark recombination mechanism. We adopt two distribution models of strange sea, those are the light-cone meson-baryon fluctuation model and the effective chiral quark model. Our results show that the asymmetry induced by the strange quark distributions is distinct, which is measurable in experiments. And, there are evident differences between the predictions of our calculation and previous estimation. Therefore, the experimental measurements on the Ds+ -- Ds- asymmetry may impose a unique restriction on the strange-antistrange distribution asymmetry models. |
1002.2495 | Harmen J. Warringa | Kenji Fukushima, Dmitri E. Kharzeev, Harmen J. Warringa | Real-time dynamics of the Chiral Magnetic Effect | 4 pages, 3 figures, Revtex | Phys.Rev.Lett.104:212001,2010 | 10.1103/PhysRevLett.104.212001 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In quantum chromodynamics, a gauge field configuration with nonzero
topological charge generates a difference between the number of left- and
right-handed quarks. When a (electromagnetic) magnetic field is added to this
configuration, an electromagnetic current is induced along the magnetic field;
this is called the chiral magnetic effect. We compute this current in the
presence of a color flux tube possessing topological charge, with a magnetic
field applied perpendicular to it. We argue that this situation is realized at
the early stage of relativistic heavy-ion collisions.
| [
{
"created": "Fri, 12 Feb 2010 08:12:56 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Fukushima",
"Kenji",
""
],
[
"Kharzeev",
"Dmitri E.",
""
],
[
"Warringa",
"Harmen J.",
""
]
] | In quantum chromodynamics, a gauge field configuration with nonzero topological charge generates a difference between the number of left- and right-handed quarks. When a (electromagnetic) magnetic field is added to this configuration, an electromagnetic current is induced along the magnetic field; this is called the chiral magnetic effect. We compute this current in the presence of a color flux tube possessing topological charge, with a magnetic field applied perpendicular to it. We argue that this situation is realized at the early stage of relativistic heavy-ion collisions. |
2305.10497 | Keping Xie | Keping Xie, Bei Zhou, T.J. Hobbs | The Photon Content of the Neutron | 38 pages, 22 figures | null | null | ANL-182626, MSUHEP-24-004, PITT-PACC-2314 | hep-ph astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we complete our CT18qed study with the neutron's photon parton
distribution function (PDF), which is essential for the nucleus scattering
phenomenology. Two methods, CT18lux and CT18qed, based on the LUXqed formalism
and the DGLAP evolution, respectively, to determine the neutron's photon PDF
have been presented. Various low-$Q^2$ non-perturbative variations have been
carefully examined, which are treated as additional uncertainties on top of
those induced by quark and gluon PDFs. The impacts of the momentum sum rule as
well as isospin symmetry violation have been explored, and turn out to be
negligible. A detailed comparison with other neutron's photon PDF sets has been
performed, which shows a great improvement in the precision and a reasonable
uncertainty estimation in our results. Finally, two phenomenological
implications are demonstrated with photon-initiated processes: neutrino-nucleus
$W$-boson production, which is important for the near-future TeV--PeV neutrino
observations, and the axion-like particle production at a high-energy muon
beam-dump experiment.
| [
{
"created": "Wed, 17 May 2023 18:05:50 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2024 19:41:43 GMT",
"version": "v2"
}
] | 2024-04-01 | [
[
"Xie",
"Keping",
""
],
[
"Zhou",
"Bei",
""
],
[
"Hobbs",
"T. J.",
""
]
] | In this work, we complete our CT18qed study with the neutron's photon parton distribution function (PDF), which is essential for the nucleus scattering phenomenology. Two methods, CT18lux and CT18qed, based on the LUXqed formalism and the DGLAP evolution, respectively, to determine the neutron's photon PDF have been presented. Various low-$Q^2$ non-perturbative variations have been carefully examined, which are treated as additional uncertainties on top of those induced by quark and gluon PDFs. The impacts of the momentum sum rule as well as isospin symmetry violation have been explored, and turn out to be negligible. A detailed comparison with other neutron's photon PDF sets has been performed, which shows a great improvement in the precision and a reasonable uncertainty estimation in our results. Finally, two phenomenological implications are demonstrated with photon-initiated processes: neutrino-nucleus $W$-boson production, which is important for the near-future TeV--PeV neutrino observations, and the axion-like particle production at a high-energy muon beam-dump experiment. |
2004.07573 | Dmitri Melikhov | Dmitri Melikhov and Silvano Simula | Nonintegrable threshold singularities of two-point functions in
perturbation theory | 7 pages, Extended version, Proof by induction is given in Appendices
A and B, Conclusions remain unchanged | Eur. Phys. J. Plus 136 (2021) 106 | 10.1140/epjp/s13360-020-01024-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In perturbation theory, the spectral densities of two-point functions develop
non-integrable threshold singularities at higher orders. In QCD, such
singularities emerge when calculating the diagrams in terms of the pole quark
mass, and they become stronger when one rearranges the perturbative expansion
in terms of the running quark mass. In this paper we discuss the proper way to
handle such singularities.
| [
{
"created": "Thu, 16 Apr 2020 10:25:03 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jun 2020 14:05:25 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Aug 2020 21:59:57 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Oct 2020 20:13:59 GMT",
"version": "v4"
}
] | 2021-01-20 | [
[
"Melikhov",
"Dmitri",
""
],
[
"Simula",
"Silvano",
""
]
] | In perturbation theory, the spectral densities of two-point functions develop non-integrable threshold singularities at higher orders. In QCD, such singularities emerge when calculating the diagrams in terms of the pole quark mass, and they become stronger when one rearranges the perturbative expansion in terms of the running quark mass. In this paper we discuss the proper way to handle such singularities. |
hep-ph/9707207 | Martin Hirsch | M. Hirsch, H.V. Klapdor-Kleingrothaus and S.G. Kovalenko | R-parity Conserving Supersymmetry, Neutrino Mass and Neutrinoless Double
Beta Decay | LATEX, 29 pages + 4 (uuencoded) figures appended | Phys.Rev. D57 (1998) 1947-1961 | 10.1103/PhysRevD.57.1947 | null | hep-ph | null | We consider contributions of R-parity conserving softly broken supersymmetry
(SUSY) to neutrinoless double beta ($\znbb$) decay via the (B-L)-violating
sneutrino mass term. The latter is a generic ingredient of any weak-scale SUSY
model with a Majorana neutrino mass. The new R-parity conserving SUSY
contributions to $\znbb$ are realized at the level of box diagrams. We derive
the effective Lagrangian describing the SUSY-box mechanism of $\znbb$-decay and
the corresponding nuclear matrix elements. The 1-loop sneutrino contribution to
the Majorana neutrino mass is also derived.
Given the data on the $\znbb$-decay half-life of $^{76}$Ge and the neutrino
mass we obtain constraints on the (B-L)-violating sneutrino mass. These
constraints leave room for accelerator searches for certain manifestations of
the 2nd and 3rd generation (B-L)-violating sneutrino mass term, but are most
probably too tight for first generation (B-L)-violating sneutrino masses to be
searched for directly.
| [
{
"created": "Tue, 1 Jul 1997 15:26:19 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Hirsch",
"M.",
""
],
[
"Klapdor-Kleingrothaus",
"H. V.",
""
],
[
"Kovalenko",
"S. G.",
""
]
] | We consider contributions of R-parity conserving softly broken supersymmetry (SUSY) to neutrinoless double beta ($\znbb$) decay via the (B-L)-violating sneutrino mass term. The latter is a generic ingredient of any weak-scale SUSY model with a Majorana neutrino mass. The new R-parity conserving SUSY contributions to $\znbb$ are realized at the level of box diagrams. We derive the effective Lagrangian describing the SUSY-box mechanism of $\znbb$-decay and the corresponding nuclear matrix elements. The 1-loop sneutrino contribution to the Majorana neutrino mass is also derived. Given the data on the $\znbb$-decay half-life of $^{76}$Ge and the neutrino mass we obtain constraints on the (B-L)-violating sneutrino mass. These constraints leave room for accelerator searches for certain manifestations of the 2nd and 3rd generation (B-L)-violating sneutrino mass term, but are most probably too tight for first generation (B-L)-violating sneutrino masses to be searched for directly. |
1204.1230 | Xiao-Gang He | Guan-Nan Li, Hsiu-Hsien Lin, Dong Xu, Xiao-Gang He | The $\alpha$, $\beta$ and $\gamma$ parameterizations of CP violating CKM
phase | 14 page, 1 figure | null | 10.1142/S0217751X13500140 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CKM matrix describing quark mixing with three generations can be
parameterized by three mixing angles and one CP violating phase. In most of the
parameterizations, the CP violating phase chosen is not a directly measurable
quantity and is parametrization dependent. In this work, we propose to use
experimentally measurable CP violating quantities, $\alpha$, $\beta$ or
$\gamma$ in the unitarity triangle as the phase in the CKM matrix, and
construct explicit $\alpha$, $\beta$ and $\gamma$ parameterizations.
Approximate Wolfenstein-like expressions are also suggested.
| [
{
"created": "Thu, 5 Apr 2012 13:54:00 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Li",
"Guan-Nan",
""
],
[
"Lin",
"Hsiu-Hsien",
""
],
[
"Xu",
"Dong",
""
],
[
"He",
"Xiao-Gang",
""
]
] | The CKM matrix describing quark mixing with three generations can be parameterized by three mixing angles and one CP violating phase. In most of the parameterizations, the CP violating phase chosen is not a directly measurable quantity and is parametrization dependent. In this work, we propose to use experimentally measurable CP violating quantities, $\alpha$, $\beta$ or $\gamma$ in the unitarity triangle as the phase in the CKM matrix, and construct explicit $\alpha$, $\beta$ and $\gamma$ parameterizations. Approximate Wolfenstein-like expressions are also suggested. |
hep-ph/0703047 | Jonathan M. Flynn | Jonathan M Flynn (1), Juan Nieves (2) ((1) University of Southampton,
(2) Universidad de Granada) | Elastic s-wave B pi, D pi, D K and K pi scattering from lattice
calculations of scalar form factors in semileptonic decays | 16 pages, LaTeX, 5 figures: version accepted for publication | Phys.Rev.D75:074024,2007 | 10.1103/PhysRevD.75.074024 | null | hep-ph | null | We show how theoretical, principally lattice, calculations of the scalar form
factors in semileptonic pseudoscalar-to-pseudoscalar decays can be used to
extract information about the corresponding elastic s-wave scattering channels.
We find values for the scattering lengths m_pi a = 0.179(17)(14), 0.26(26) and
0.29(4) for elastic s-wave isospin-1/2 K pi, B pi and D pi channels
respectively. We also determine phase shifts. For the D K channel we find hints
that there is a bound state which can be identified with the recently
discovered D_{s0}^+(2317).
| [
{
"created": "Mon, 5 Mar 2007 11:37:53 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2007 09:02:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Flynn",
"Jonathan M",
""
],
[
"Nieves",
"Juan",
""
]
] | We show how theoretical, principally lattice, calculations of the scalar form factors in semileptonic pseudoscalar-to-pseudoscalar decays can be used to extract information about the corresponding elastic s-wave scattering channels. We find values for the scattering lengths m_pi a = 0.179(17)(14), 0.26(26) and 0.29(4) for elastic s-wave isospin-1/2 K pi, B pi and D pi channels respectively. We also determine phase shifts. For the D K channel we find hints that there is a bound state which can be identified with the recently discovered D_{s0}^+(2317). |
hep-ph/9910534 | Martin Beneke | M. Beneke (CERN) | Top quark production near threshold | 8 pages, LaTeX, Talk presented at the High Energy Physics
International Euroconference on Quantum Chromodynamics (QCD'99), Montpellier,
France, 7-13 July 1999 | Nucl.Phys.Proc.Suppl. 86 (2000) 547-554 | 10.1016/S0920-5632(00)00621-6 | CERN-TH/99-281 | hep-ph | null | The present theoretical status of top quark pair production near threshold at
(future) $e^+ e^-$ ($\mu^+\mu^-$) colliders is summarized.
| [
{
"created": "Thu, 28 Oct 1999 15:37:04 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Beneke",
"M.",
"",
"CERN"
]
] | The present theoretical status of top quark pair production near threshold at (future) $e^+ e^-$ ($\mu^+\mu^-$) colliders is summarized. |
1311.4732 | Jialun Ping | Hongxia Huang, Jialun Ping and Fan Wang | Possible $H$-like dibaryon states with heavy quarks | 6 pages, 4 figures, 3 tables | Phys. Rev. C 89, 035201 (2014) | 10.1103/PhysRevC.89.035201 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Possible $H$-like dibaryon states $\Lambda_{c}\Lambda_{c}$ and
$\Lambda_{b}\Lambda_{b}$ are investigated within the framework of quark
delocalization color screening model. The results show that the interaction
between two $\Lambda_{c}$'s is repulsive, so it cannot be bound state by
itself. However, the strong attraction in $\Sigma_{c}\Sigma_{c}$ and
$\Sigma^{*}_{c}\Sigma^{*}_{c}$ channels and the strong channel coupling, due to
the central interaction of one-gluon-exchange and one-pion-exchange, among
$\Lambda_{c}\Lambda_{c}$, $\Sigma_{c}\Sigma_{c}$ and
$\Sigma^{*}_{c}\Sigma^{*}_{c}$ push the energy of system below the threshold of
$\Lambda_{c}\Lambda_{c}$ by $22$ MeV. The corresponding system
$\Lambda_{b}\Lambda_{b}$ has the similar properties as that of
$\Lambda_{c}\Lambda_{c}$ system, and a bound state is also possible in
$\Lambda_{b}\Lambda_{b}$ system.
| [
{
"created": "Tue, 19 Nov 2013 13:30:36 GMT",
"version": "v1"
}
] | 2014-03-12 | [
[
"Huang",
"Hongxia",
""
],
[
"Ping",
"Jialun",
""
],
[
"Wang",
"Fan",
""
]
] | Possible $H$-like dibaryon states $\Lambda_{c}\Lambda_{c}$ and $\Lambda_{b}\Lambda_{b}$ are investigated within the framework of quark delocalization color screening model. The results show that the interaction between two $\Lambda_{c}$'s is repulsive, so it cannot be bound state by itself. However, the strong attraction in $\Sigma_{c}\Sigma_{c}$ and $\Sigma^{*}_{c}\Sigma^{*}_{c}$ channels and the strong channel coupling, due to the central interaction of one-gluon-exchange and one-pion-exchange, among $\Lambda_{c}\Lambda_{c}$, $\Sigma_{c}\Sigma_{c}$ and $\Sigma^{*}_{c}\Sigma^{*}_{c}$ push the energy of system below the threshold of $\Lambda_{c}\Lambda_{c}$ by $22$ MeV. The corresponding system $\Lambda_{b}\Lambda_{b}$ has the similar properties as that of $\Lambda_{c}\Lambda_{c}$ system, and a bound state is also possible in $\Lambda_{b}\Lambda_{b}$ system. |
0706.0399 | Sandhya Choubey | Ram Lal Awasthi, Sandhya Choubey | Confusing Sterile Neutrinos with Deviation from Tribimaximal Mixing at
Neutrino Telescopes | 22 pages, version to appear in Phys. Rev. D | Phys.Rev.D76:113002,2007 | 10.1103/PhysRevD.76.113002 | HRI-P-07-06-001 | hep-ph astro-ph hep-ex | null | We expound the impact of extra sterile species on the ultra high energy
neutrino fluxes in neutrino telescopes. We use three types of well-known flux
ratios and compare the values of these flux ratios in presence of sterile
neutrinos, with those predicted by deviation from the tribimaximal mixing
scheme. We show that in the upcoming neutrino telescopes, its easy to confuse
between the signature of sterile neutrinos with that of the deviation from
tribimaximal mixing. We also show that if the measured flux ratios acquire a
value well outside the range predicted by the standard scenario with three
active neutrinos only, it might be possible to tell the presence of extra
sterile neutrinos by observing ultra high energy neutrinos in future neutrino
telescopes.
| [
{
"created": "Mon, 4 Jun 2007 09:16:32 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2007 15:44:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Awasthi",
"Ram Lal",
""
],
[
"Choubey",
"Sandhya",
""
]
] | We expound the impact of extra sterile species on the ultra high energy neutrino fluxes in neutrino telescopes. We use three types of well-known flux ratios and compare the values of these flux ratios in presence of sterile neutrinos, with those predicted by deviation from the tribimaximal mixing scheme. We show that in the upcoming neutrino telescopes, its easy to confuse between the signature of sterile neutrinos with that of the deviation from tribimaximal mixing. We also show that if the measured flux ratios acquire a value well outside the range predicted by the standard scenario with three active neutrinos only, it might be possible to tell the presence of extra sterile neutrinos by observing ultra high energy neutrinos in future neutrino telescopes. |
hep-ph/0209229 | Felix Nagel | Markus Diehl, Otto Nachtmann and Felix Nagel | Triple gauge couplings in polarised e-e+ -> W-W+ and their measurement
using optimal observables | 56 pages, 20 figures | Eur.Phys.J.C27:375-397,2003 | 10.1140/epjc/s2002-01096-y | HD-THEP-02-34 | hep-ph | null | The sensitivity of optimal integrated observables to electroweak triple gauge
couplings is investigated for the process e-e+ -> W-W+ -> 4 fermions at future
linear colliders. By a suitable reparameterisation of the couplings we achieve
that all 28 coupling parameters have uncorrelated statistical errors and are
naturally normalised for this process. Discrete symmetry properties simplify
the analysis and allow checks on the stability of numerical results. We
investigate the sensitivity to the couplings of the normalised event
distribution and the additional constraints that can be obtained from the total
rate. Particular emphasis is put on the gain in sensitivity one can achieve
with longitudinal beam polarisation. We also point out questions that may best
be settled with transversely polarised beams. In particular we find that with
purely longitudinal polarisation one linear combination of coupling parameters
is hardly measurable by means of the normalised event distribution.
| [
{
"created": "Thu, 19 Sep 2002 16:01:29 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Diehl",
"Markus",
""
],
[
"Nachtmann",
"Otto",
""
],
[
"Nagel",
"Felix",
""
]
] | The sensitivity of optimal integrated observables to electroweak triple gauge couplings is investigated for the process e-e+ -> W-W+ -> 4 fermions at future linear colliders. By a suitable reparameterisation of the couplings we achieve that all 28 coupling parameters have uncorrelated statistical errors and are naturally normalised for this process. Discrete symmetry properties simplify the analysis and allow checks on the stability of numerical results. We investigate the sensitivity to the couplings of the normalised event distribution and the additional constraints that can be obtained from the total rate. Particular emphasis is put on the gain in sensitivity one can achieve with longitudinal beam polarisation. We also point out questions that may best be settled with transversely polarised beams. In particular we find that with purely longitudinal polarisation one linear combination of coupling parameters is hardly measurable by means of the normalised event distribution. |
hep-ph/0208003 | Lotfi Boubekeur | Lotfi Boubekeur (SISSA/ISAS Trieste & INFN Trieste) | Leptogenesis at Low Scale | LateX, 12 pages, axodraw figures | null | null | null | hep-ph | null | A typical problem of the leptogenesis scenario is the mismatch between the
maximum reheat temperature implied by gravitino overproduction bound and the
minimum temperature required to create thermally the lightest right-handed
neutrino. We explore the possibility of baryogenesis via leptogenesis in the
presence of low scale mass right-handed neutrino. In such a scenario,
right-handed neutrinos are created thermally at low reheat temperatures without
relying on non-perturbative production mechanisms. We focus on two specific
realizations of the scenario, namely the out-of-equilibrium decay of
right-handed neutrinos (Fukugita-Yanagida) and the leptogenesis via the $LH_u$
flat direction (Affleck-Dine). We find that in general, the two scenarios are
able to produce the required baryon excess for a reasonable amount of CP
violation.
| [
{
"created": "Thu, 1 Aug 2002 13:38:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boubekeur",
"Lotfi",
"",
"SISSA/ISAS Trieste & INFN Trieste"
]
] | A typical problem of the leptogenesis scenario is the mismatch between the maximum reheat temperature implied by gravitino overproduction bound and the minimum temperature required to create thermally the lightest right-handed neutrino. We explore the possibility of baryogenesis via leptogenesis in the presence of low scale mass right-handed neutrino. In such a scenario, right-handed neutrinos are created thermally at low reheat temperatures without relying on non-perturbative production mechanisms. We focus on two specific realizations of the scenario, namely the out-of-equilibrium decay of right-handed neutrinos (Fukugita-Yanagida) and the leptogenesis via the $LH_u$ flat direction (Affleck-Dine). We find that in general, the two scenarios are able to produce the required baryon excess for a reasonable amount of CP violation. |
0805.1119 | Qiang Zhao | Xiao-Hai Liu and Qiang Zhao | Search for a promising tetraquark candidate $X(ud\bar{s}\bar{s})$ in
$pn\to \Lambda\Lambda X$ | Revised version to appear on J. Phys. G. Additional discussions on
the tetraquark production mechanisms are included | J.Phys.G36:015003,2009 | 10.1088/0954-3899/36/1/015003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to search for a tetraquark candidate $X(ud\bar{s}\bar{s})$ in
$pn\to \Lambda\Lambda X(ud\bar{s}\bar{s})\to \Lambda\Lambda K^+K^0$ or
$\Lambda\Lambda KK^*$. The existence of tetraquark state $X(ud\bar{s}\bar{s})$
with $J^P=0^+$, $1^-$ or $1^+$ was predicted in the literature based on
specific diquark effective degrees of freedom inside hadrons. In order to
understand the underlying dynamics for exotic hadrons, a search for the
tetraquark $X(ud\bar{s}\bar{s})$ is strongly recommended. The proposed reaction
involves two $\Lambda$ production, of which the narrow widths make it a great
advantage in the analysis of the final state missing mass spectrum. We make an
estimate of the production rate of $X(ud\bar{s}\bar{s})$ in an effective
Lagrangian theory and find that for $J^P=1^-$ the sample events of $\sim 2200 \
nb^{-1}$ will be able to identify $X(ud\bar{s}\bar{s})$ with five standard
deviations at a width of 10 MeV to $K^+K^0$ near threshold. For $J^P=1^+$ with
a width of 20 MeV to $KK^*$, the sample events of $\sim 130 nb^{-1}$ will be
needed. Large production cross sections are expected in a kinematic region
beyond the threshold. We emphasize the advantage of low background in this
transition channel, and in the meantime caution the large uncertainties in the
present estimate due to lack of knowledge about the $X(ud\bar{s}\bar{s})$
state. Implications for its heavy-flavored partners $qq\bar{c}\bar{c}$ and
$qq\bar{b}\bar{b}$ are briefly discussed.
| [
{
"created": "Thu, 8 May 2008 08:20:35 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2008 13:35:11 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Oct 2008 04:19:45 GMT",
"version": "v3"
}
] | 2008-12-18 | [
[
"Liu",
"Xiao-Hai",
""
],
[
"Zhao",
"Qiang",
""
]
] | We propose to search for a tetraquark candidate $X(ud\bar{s}\bar{s})$ in $pn\to \Lambda\Lambda X(ud\bar{s}\bar{s})\to \Lambda\Lambda K^+K^0$ or $\Lambda\Lambda KK^*$. The existence of tetraquark state $X(ud\bar{s}\bar{s})$ with $J^P=0^+$, $1^-$ or $1^+$ was predicted in the literature based on specific diquark effective degrees of freedom inside hadrons. In order to understand the underlying dynamics for exotic hadrons, a search for the tetraquark $X(ud\bar{s}\bar{s})$ is strongly recommended. The proposed reaction involves two $\Lambda$ production, of which the narrow widths make it a great advantage in the analysis of the final state missing mass spectrum. We make an estimate of the production rate of $X(ud\bar{s}\bar{s})$ in an effective Lagrangian theory and find that for $J^P=1^-$ the sample events of $\sim 2200 \ nb^{-1}$ will be able to identify $X(ud\bar{s}\bar{s})$ with five standard deviations at a width of 10 MeV to $K^+K^0$ near threshold. For $J^P=1^+$ with a width of 20 MeV to $KK^*$, the sample events of $\sim 130 nb^{-1}$ will be needed. Large production cross sections are expected in a kinematic region beyond the threshold. We emphasize the advantage of low background in this transition channel, and in the meantime caution the large uncertainties in the present estimate due to lack of knowledge about the $X(ud\bar{s}\bar{s})$ state. Implications for its heavy-flavored partners $qq\bar{c}\bar{c}$ and $qq\bar{b}\bar{b}$ are briefly discussed. |
hep-ph/0012324 | Muneyuki Ishida | Kunio Takamatsu (CROSS, Japan) | sigma and kappa in Scattering Processes and New pi0 pi0 Phase Shift Data | proc. of ``Possible Existence of sigma-Meson and Its Implication to
Hadron Physics," YITP, Kyoto, June 12--14, 2000. 6 pages, uses ptptex.sty | Prog.Theor.Phys. 102 (2001) E52-E57 | null | null | hep-ph | null | The evidences for sigma(600) and kappa(900) observed in our analyses on the
pi pi and K pi scattering phase shift data are described, briefly. The analysis
have been performed by the interfering amplitude method, which satisfies the
unitarity requirement, using physically meaningful parameters. The introduction
of the negative phase shifts (repulsive force) are essential in the analysis.
New data for the pi0 pi0 scattering amplitudes and the I=0 S wave phase shifts
are presented. The data have been obtained in the pi-p charge exchange
reaction, pi- p --> pi0 pi0 n at 9 GeV by the E135 experiment at the KEK PS.
The amplitude analysis are performed. The behavior of the I=0 S wave phase
shifts below KKbar threshold are consistent with those of the pi+ pi-, so
called, standard data and those of the down-flat solution of the
CERN-Cracow-Munich polarization data. The analysis of the pi0 pi0 phase shift
data observes sigma(600) with the B-W parameters, M_sigma =588 +- 12 MeV and
Gamma_sigma =281 +- 25 MeV, which are in good agreement with those in our
analysis on the pi+ pi- data.
| [
{
"created": "Sat, 23 Dec 2000 13:57:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Takamatsu",
"Kunio",
"",
"CROSS, Japan"
]
] | The evidences for sigma(600) and kappa(900) observed in our analyses on the pi pi and K pi scattering phase shift data are described, briefly. The analysis have been performed by the interfering amplitude method, which satisfies the unitarity requirement, using physically meaningful parameters. The introduction of the negative phase shifts (repulsive force) are essential in the analysis. New data for the pi0 pi0 scattering amplitudes and the I=0 S wave phase shifts are presented. The data have been obtained in the pi-p charge exchange reaction, pi- p --> pi0 pi0 n at 9 GeV by the E135 experiment at the KEK PS. The amplitude analysis are performed. The behavior of the I=0 S wave phase shifts below KKbar threshold are consistent with those of the pi+ pi-, so called, standard data and those of the down-flat solution of the CERN-Cracow-Munich polarization data. The analysis of the pi0 pi0 phase shift data observes sigma(600) with the B-W parameters, M_sigma =588 +- 12 MeV and Gamma_sigma =281 +- 25 MeV, which are in good agreement with those in our analysis on the pi+ pi- data. |
1305.2627 | Cheuk-Yin Wong | Cheuk-Yin Wong and Grzegorz Wilk | Tsallis Fits to pT Spectra and Multiple Hard Scattering in pp Collisions
at the LHC | 19 pages, 8 figures | Phys. Rev. D 87, 114007 (2013) | 10.1103/PhysRevD.87.114007 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phenomenological Tsallis fits to the CMS, ATLAS, and ALICE transverse
momentum spectra of hadrons for pp collisions at LHC were recently found to
extend over a large range of the transverse momentum. We investigate whether
the few degrees of freedom in the Tsallis parametrization may arise from the
relativistic parton-parton hard-scattering and related processes. The effects
of the multiple hard-scattering and parton showering processes on the power law
are discussed. We find empirically that whereas the transverse spectra of both
hadrons and jets exhibit power-law behavior of 1/pT^n at high pT, the power
indices n for hadrons are systematically greater than those for jets, for which
n~4-5.
| [
{
"created": "Sun, 12 May 2013 20:01:33 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2013 17:33:58 GMT",
"version": "v2"
}
] | 2013-06-24 | [
[
"Wong",
"Cheuk-Yin",
""
],
[
"Wilk",
"Grzegorz",
""
]
] | Phenomenological Tsallis fits to the CMS, ATLAS, and ALICE transverse momentum spectra of hadrons for pp collisions at LHC were recently found to extend over a large range of the transverse momentum. We investigate whether the few degrees of freedom in the Tsallis parametrization may arise from the relativistic parton-parton hard-scattering and related processes. The effects of the multiple hard-scattering and parton showering processes on the power law are discussed. We find empirically that whereas the transverse spectra of both hadrons and jets exhibit power-law behavior of 1/pT^n at high pT, the power indices n for hadrons are systematically greater than those for jets, for which n~4-5. |
hep-ph/0105268 | Adrian Dumitru | Adrian Dumitru (Columbia Univ.) and Larry McLerran (BNL) | How Protons Shatter Colored Glass | 9 pages, RevTex, 3 Figures; some typos corrected, the scaling of
<kt>^2 with dN/dy is derived | Nucl.Phys.A700:492-508,2002 | 10.1016/S0375-9474(01)01301-X | CU-TP-1018, BNL-NT-01/10 | hep-ph nucl-th | null | We consider the implications of the Color Glass Condensate for the central
region of p+A collisions. We compute the k_t distribution of radiated gluons
and their rapidity distribution dN/dy analytically, both in the perturbative
regime and in the region between the two saturation momenta. We find an
analytic expression for the number of produced gluons which is valid when the
saturation momentum of the proton is much less than that of the nucleus. We
discuss the scaling of the produced multiplicity with A. We show that the slope
of the rapidity density dN/dy provides an experimental measure for the
renormalization-group evolution of the color charge density of the Color Glass
Condensate (CGC). We also argue that these results are easily generalized to
collisions of nuclei of different A at central rapidity, or with the same A but
at a rapidity far from the central region.
| [
{
"created": "Fri, 25 May 2001 18:46:44 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2001 14:41:16 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Dumitru",
"Adrian",
"",
"Columbia Univ."
],
[
"McLerran",
"Larry",
"",
"BNL"
]
] | We consider the implications of the Color Glass Condensate for the central region of p+A collisions. We compute the k_t distribution of radiated gluons and their rapidity distribution dN/dy analytically, both in the perturbative regime and in the region between the two saturation momenta. We find an analytic expression for the number of produced gluons which is valid when the saturation momentum of the proton is much less than that of the nucleus. We discuss the scaling of the produced multiplicity with A. We show that the slope of the rapidity density dN/dy provides an experimental measure for the renormalization-group evolution of the color charge density of the Color Glass Condensate (CGC). We also argue that these results are easily generalized to collisions of nuclei of different A at central rapidity, or with the same A but at a rapidity far from the central region. |
1012.0703 | Bohdan Grzadkowski | Bohdan Grzadkowski, Per Osland | Natural Two-Higgs-Doublet Model | 2 figures, submitted to Fortschritte der Physik, presented at the
10th Hellenic School on Elementary Particle Physics and Gravity, Corfu 2010 | null | 10.1002/prop.201000098 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Two-Higgs-Doublet Model (2HDM) constrained by the
two-loop-order requirement of cancellation of quadratic divergences is
consistent with the existing experimental constraints. The model allows to
ameliorate the little hierarchy problem by suppressing the quadratic
corrections to scalar masses and lifting the mass of the lightest Higgs boson.
A strong source of CP violation emerges from the scalar potential. The cutoff
originating from the naturality arguments is shifted from 0.6 TeV in the
Standard Model to >6 TeV in the 2HDM, depending on the mass of the lightest
scalar.
| [
{
"created": "Fri, 3 Dec 2010 11:15:02 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Dec 2010 11:44:41 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Grzadkowski",
"Bohdan",
""
],
[
"Osland",
"Per",
""
]
] | We show that the Two-Higgs-Doublet Model (2HDM) constrained by the two-loop-order requirement of cancellation of quadratic divergences is consistent with the existing experimental constraints. The model allows to ameliorate the little hierarchy problem by suppressing the quadratic corrections to scalar masses and lifting the mass of the lightest Higgs boson. A strong source of CP violation emerges from the scalar potential. The cutoff originating from the naturality arguments is shifted from 0.6 TeV in the Standard Model to >6 TeV in the 2HDM, depending on the mass of the lightest scalar. |
2306.03388 | Hai-Bing Fu | Hai-Jiang Tian, Xuan Luo, Hai-Bing Fu | Further study on the production of P-wave doubly heavy baryons from
Z-boson decays | 11 pages, 4 figures, matches published version in PLB | Physics Letters B 847 (2023) 138302 | 10.1016/j.physletb.2023.138302 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we carried out a systematic investigation for the excited
doubly heavy baryons production in $Z$-boson decays within the NRQCD
factorization approach. Our investigation accounts for all the $P$-wave
intermediate diquark states, {\it i.e.} $\langle cc\rangle[^1P_1]_{\bar 3}$,
$\langle cc\rangle[^3P_J]_{6}$, $\langle bc\rangle[^1P_1]_{\bar 3/6}$, $\langle
bc\rangle[^3P_J]_{\bar 3/6}$, $\langle bb\rangle[^1P_1]_{\bar 3}$, and $\langle
bb\rangle[^3P_J]_{6}$ with $J = (0, 1, 2)$. The results show that contributions
from all diquark states in $P$-wave were $7\%$, $8\%$, and $3\%$ in comparing
with $S$-wave for the production of $\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$ via
$Z$-boson decay, respectively. Based on these results, we predicted about
$0.539\times 10^3(10^6)$ events for $\Xi_{cc}$, $1.827\times 10^3(10^6)$ events
for $\Xi_{bc}$, and $0.036\times 10^3(10^6)$ events for $\Xi_{bb}$ can be
produced annually at the LHC (CEPC). Additionally, we plot the differential
decay widths of $\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$ as a function of the
invariant mass $s_{23}$ and energy function $z$ distributions, and analyze the
theoretical uncertainties in decay width arising from the mass parameters of
heavy quark.
| [
{
"created": "Tue, 6 Jun 2023 04:04:34 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 2023 16:10:26 GMT",
"version": "v2"
}
] | 2023-11-20 | [
[
"Tian",
"Hai-Jiang",
""
],
[
"Luo",
"Xuan",
""
],
[
"Fu",
"Hai-Bing",
""
]
] | In this paper, we carried out a systematic investigation for the excited doubly heavy baryons production in $Z$-boson decays within the NRQCD factorization approach. Our investigation accounts for all the $P$-wave intermediate diquark states, {\it i.e.} $\langle cc\rangle[^1P_1]_{\bar 3}$, $\langle cc\rangle[^3P_J]_{6}$, $\langle bc\rangle[^1P_1]_{\bar 3/6}$, $\langle bc\rangle[^3P_J]_{\bar 3/6}$, $\langle bb\rangle[^1P_1]_{\bar 3}$, and $\langle bb\rangle[^3P_J]_{6}$ with $J = (0, 1, 2)$. The results show that contributions from all diquark states in $P$-wave were $7\%$, $8\%$, and $3\%$ in comparing with $S$-wave for the production of $\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$ via $Z$-boson decay, respectively. Based on these results, we predicted about $0.539\times 10^3(10^6)$ events for $\Xi_{cc}$, $1.827\times 10^3(10^6)$ events for $\Xi_{bc}$, and $0.036\times 10^3(10^6)$ events for $\Xi_{bb}$ can be produced annually at the LHC (CEPC). Additionally, we plot the differential decay widths of $\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$ as a function of the invariant mass $s_{23}$ and energy function $z$ distributions, and analyze the theoretical uncertainties in decay width arising from the mass parameters of heavy quark. |
hep-ph/0604184 | Elena G. Ferreiro | A. Capella and E. G. Ferreiro | Elliptic Flow in a Final State Interaction Model | 4 pages, 6 figures, proceedings of XLIst Rencontres de Moriond: QCD
and Hadronic Interactions at high energy | null | null | null | hep-ph | null | We propose a final state interaction model to describe the fixed $p_T$
suppression of the yield of particles at all values of $p_T$. We make an
extension of the model to the motion in the transverse plane which introduces a
dependence of the suppression on the azimuthal angle $\theta_R$. We obtain
values of the elliptic flow $v_{2}$ close to the experimental ones for all
values of $p_T$.
| [
{
"created": "Fri, 21 Apr 2006 17:28:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Capella",
"A.",
""
],
[
"Ferreiro",
"E. G.",
""
]
] | We propose a final state interaction model to describe the fixed $p_T$ suppression of the yield of particles at all values of $p_T$. We make an extension of the model to the motion in the transverse plane which introduces a dependence of the suppression on the azimuthal angle $\theta_R$. We obtain values of the elliptic flow $v_{2}$ close to the experimental ones for all values of $p_T$. |
hep-ph/0011384 | Carlo Oleari | Carlo Oleari | The tensor reduction and master integrals of the two-loop massless
crossed box | 3 pages, 1 figure. Talk given at ACAT2000, Fermilab, IL, 16-20
October, 2000. To be published in "Advanced Computing and Analysis Techniques
in Physics Research", AIP | null | 10.1063/1.1405302 | null | hep-ph | null | We briefly discuss an algorithm for the tensor reduction of the two-loop
massless crossed boxes, with light-like external legs, and the computation of
the relative master integrals.
| [
{
"created": "Thu, 30 Nov 2000 07:43:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Oleari",
"Carlo",
""
]
] | We briefly discuss an algorithm for the tensor reduction of the two-loop massless crossed boxes, with light-like external legs, and the computation of the relative master integrals. |
2202.10509 | Alfredo Glioti | Siyu Chen, Alfredo Glioti, Riccardo Rattazzi, Lorenzo Ricci, Andrea
Wulzer | Learning from Radiation at a Very High Energy Lepton Collider | 48 pages, 17 figures | null | 10.1007/JHEP05(2022)180 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the potential of lepton collisions with about $10\text{ TeV}$ center
of mass energy to probe Electroweak, Higgs and Top short-distance physics at
the $100\text{ TeV}$ scale, pointing out the interplay with the long-distance
($100\text{ GeV}$) phenomenon of Electroweak radiation. On one hand, we find
that sufficiently accurate theoretical predictions require the resummed
inclusion of radiation effects, which we perform at the double logarithmic
order. On the other hand, we notice that short-distance physics does influence
the emission of Electroweak radiation. Therefore the investigation of the
radiation pattern can enhance the sensitivity to new short-distance physical
laws. We illustrate these aspects by studying Effective Field Theory contact
interactions in di-fermion and di-boson production, and comparing cross-section
measurements that require or that exclude the emission of massive Electroweak
bosons. The combination of the two types of measurements is found to enhance
the sensitivity to the new interactions. Based on these results, we perform
sensitivity projections to Higgs and Top Compositeness and to minimal $Z'$ new
physics scenarios at future muon colliders.
| [
{
"created": "Mon, 21 Feb 2022 19:45:50 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Chen",
"Siyu",
""
],
[
"Glioti",
"Alfredo",
""
],
[
"Rattazzi",
"Riccardo",
""
],
[
"Ricci",
"Lorenzo",
""
],
[
"Wulzer",
"Andrea",
""
]
] | We study the potential of lepton collisions with about $10\text{ TeV}$ center of mass energy to probe Electroweak, Higgs and Top short-distance physics at the $100\text{ TeV}$ scale, pointing out the interplay with the long-distance ($100\text{ GeV}$) phenomenon of Electroweak radiation. On one hand, we find that sufficiently accurate theoretical predictions require the resummed inclusion of radiation effects, which we perform at the double logarithmic order. On the other hand, we notice that short-distance physics does influence the emission of Electroweak radiation. Therefore the investigation of the radiation pattern can enhance the sensitivity to new short-distance physical laws. We illustrate these aspects by studying Effective Field Theory contact interactions in di-fermion and di-boson production, and comparing cross-section measurements that require or that exclude the emission of massive Electroweak bosons. The combination of the two types of measurements is found to enhance the sensitivity to the new interactions. Based on these results, we perform sensitivity projections to Higgs and Top Compositeness and to minimal $Z'$ new physics scenarios at future muon colliders. |
0907.2006 | Yusuke Shimizu | Hajime Ishimori, Tatsuo Kobayashi, Hiroshi Okada, Yusuke Shimizu,
Morimitsu Tanimoto | Delta(54) Flavor Model for Leptons and Sleptons | 22 pages, 4 figures, with minor modifications, figures are revised
and discussions are added | JHEP 0912:054,2009 | 10.1088/1126-6708/2009/12/054 | KUNS-2214 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied $\Delta(54)\times Z_2$ flavor model for leptons and sleptons.
The tri-bimaximal mixing can be reproduced for arbitrary neutrino masses if
vacuum alignments of scalar fields are guaranteed. The deviation from the
tri-bimaximal mixing of leptons is predicted. The predicted upper bound for
$\sin\theta_{13}$ is 0.06. The magnitude of $\sin\theta_{23}$ could be deviated
from the maximal mixing considerably, but $\sin\theta_{12}$ is hardly deviated
from the tri-maximal mixing. We have also studied SUSY breaking terms in the
slepton sector. Three families of left-handed and right-handed slepton masses
are degenerate. Even although flavor symmetry breaking effects are taken into
account, our model leads to smaller values of flavor changing neutral currents
than the present experimental bounds.
| [
{
"created": "Mon, 13 Jul 2009 04:16:37 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2009 07:57:58 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Oct 2009 08:38:37 GMT",
"version": "v3"
}
] | 2010-01-15 | [
[
"Ishimori",
"Hajime",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Shimizu",
"Yusuke",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We have studied $\Delta(54)\times Z_2$ flavor model for leptons and sleptons. The tri-bimaximal mixing can be reproduced for arbitrary neutrino masses if vacuum alignments of scalar fields are guaranteed. The deviation from the tri-bimaximal mixing of leptons is predicted. The predicted upper bound for $\sin\theta_{13}$ is 0.06. The magnitude of $\sin\theta_{23}$ could be deviated from the maximal mixing considerably, but $\sin\theta_{12}$ is hardly deviated from the tri-maximal mixing. We have also studied SUSY breaking terms in the slepton sector. Three families of left-handed and right-handed slepton masses are degenerate. Even although flavor symmetry breaking effects are taken into account, our model leads to smaller values of flavor changing neutral currents than the present experimental bounds. |
1909.00370 | Jose Antonio Oller | J.A. Oller | Coupled-channel approach in hadron-hadron scattering | 104 pages, 9 figures. Invited review article for Prog. Part. Nucl.
Phys | null | 10.1016/j.ppnp.2019.103728 | null | hep-ph cond-mat.quant-gas nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coupled-channel dynamics for scattering and production processes in
partial-wave amplitudes is discussed from a perspective that emphasizes
unitarity and analyticity. We elaborate on several methods that have driven to
important results in hadron physics, either by themselves or in conjunction
with effective field theory. We also develop and compare with the use of the
Lippmann-Schwinger equation in near-threshold scattering. The
final(initial)-state interactions are discussed in detail for the elastic and
coupled-channel case. Emphasis has been put in the derivation and discussion of
the methods presented, with some applications examined as important examples of
their usage.
| [
{
"created": "Sun, 1 Sep 2019 10:07:40 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Oller",
"J. A.",
""
]
] | Coupled-channel dynamics for scattering and production processes in partial-wave amplitudes is discussed from a perspective that emphasizes unitarity and analyticity. We elaborate on several methods that have driven to important results in hadron physics, either by themselves or in conjunction with effective field theory. We also develop and compare with the use of the Lippmann-Schwinger equation in near-threshold scattering. The final(initial)-state interactions are discussed in detail for the elastic and coupled-channel case. Emphasis has been put in the derivation and discussion of the methods presented, with some applications examined as important examples of their usage. |
2310.00586 | Kang Sin Choi | Kang-Sin Choi | On the Observables of Renormalizable Interactions | 9 pages, 1 figure, published version | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the renormalization of scalar mass and point out that the
quantum correction to the physical observable, as opposed to the bare
parameter, of a renormalizable operator, is technically insensitive to
ultraviolet physics and independent of the regularization scheme. It is
expressed as the difference in the same quantities at different energy scales,
maintaining the same asymptotics. Thus, any sensible regularization cancels out
the divergences, including the quadratic ones, and yields the same finite
corrections. To this end, we first show that the vacuum polarization of quantum
electrodynamics is independent of the regularization scheme and a
gauge-dependent quadratic divergence is canceled in the observable. We then
calculate the quantum correction to the Higgs mass squared by the top-quark
loop. It is again finite and regularization-scheme independent. For large
external momentum, the correction of the pole mass-squared is dominated by
power running, resulting in an order of 0.1 percent correction. In particular,
the effect of heavy fields on the scalar mass correction is suppressed.
| [
{
"created": "Sun, 1 Oct 2023 06:11:21 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Oct 2023 11:43:38 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Feb 2024 05:55:49 GMT",
"version": "v3"
}
] | 2024-02-12 | [
[
"Choi",
"Kang-Sin",
""
]
] | We reconsider the renormalization of scalar mass and point out that the quantum correction to the physical observable, as opposed to the bare parameter, of a renormalizable operator, is technically insensitive to ultraviolet physics and independent of the regularization scheme. It is expressed as the difference in the same quantities at different energy scales, maintaining the same asymptotics. Thus, any sensible regularization cancels out the divergences, including the quadratic ones, and yields the same finite corrections. To this end, we first show that the vacuum polarization of quantum electrodynamics is independent of the regularization scheme and a gauge-dependent quadratic divergence is canceled in the observable. We then calculate the quantum correction to the Higgs mass squared by the top-quark loop. It is again finite and regularization-scheme independent. For large external momentum, the correction of the pole mass-squared is dominated by power running, resulting in an order of 0.1 percent correction. In particular, the effect of heavy fields on the scalar mass correction is suppressed. |
0907.3737 | Adam Martin | Kenneth Lane, Adam Martin | An Effective Lagrangian for Low-Scale Technicolor | Updated introduction, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.80.115001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an effective Lagrangian for low-scale technicolor. It describes
the interactions at energies near the mass of the lowest-lying bound states of
the lightest technifermion doublet -- the spin-one $\rho_T,\omega_T, a_T, f_T$
and the corresponding technipions $\pi_T$. This Lagrangian is intended to put
on firmer ground the technicolor straw-man phenomenology used for collider
searches of low-scale technicolor. The technivectors are described using the
hidden local symmetry (HLS) formalism of Bando et al. The Lagrangian is based
on $SU(2)\otimes U(1)\otimes U(2)_L \otimes U(2)_R$, where $SU(2)\otimes U(1)$
is the electroweak gauge group and $U(2)_L \otimes U(2)_R$ is the HLS gauge
group. Special attention is paid to the higher-derivative standard HLS and
Wess-Zumino-Witten interactions needed to describe radiative and other decays
of the $a_T$ and $\rho_T/\omega_T$, respectively.
| [
{
"created": "Tue, 21 Jul 2009 20:08:48 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2009 18:57:14 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Lane",
"Kenneth",
""
],
[
"Martin",
"Adam",
""
]
] | We present an effective Lagrangian for low-scale technicolor. It describes the interactions at energies near the mass of the lowest-lying bound states of the lightest technifermion doublet -- the spin-one $\rho_T,\omega_T, a_T, f_T$ and the corresponding technipions $\pi_T$. This Lagrangian is intended to put on firmer ground the technicolor straw-man phenomenology used for collider searches of low-scale technicolor. The technivectors are described using the hidden local symmetry (HLS) formalism of Bando et al. The Lagrangian is based on $SU(2)\otimes U(1)\otimes U(2)_L \otimes U(2)_R$, where $SU(2)\otimes U(1)$ is the electroweak gauge group and $U(2)_L \otimes U(2)_R$ is the HLS gauge group. Special attention is paid to the higher-derivative standard HLS and Wess-Zumino-Witten interactions needed to describe radiative and other decays of the $a_T$ and $\rho_T/\omega_T$, respectively. |
0907.4110 | Prashant Saraswat | Daniele S. M. Alves, Martin Jankowiak, Prashant Saraswat | Experimental constraints on the free fall acceleration of antimatter | 7 pages (two columns), 2 figures | null | null | SU-ITP-09/36 | hep-ph gr-qc hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In light of recent experimental proposals to measure the free fall
acceleration of antihydrogen in the earth's gravitational field, we investigate
the bounds that existing experiments place on any asymmetry between the free
fall of matter and antimatter. We conclude that existing experiments constrain
any such asymmetry to be less than about 10^-7. First we consider contributions
to the inertial masses of atoms that encode the presence of antimatter and use
precision Eotvos experiments to establish the level at which they satisfy the
equivalence principle. In particular we focus on vacuum polarization effects
and the antiquark content of nucleons. Second we consider a class of theories
that contain long range scalar and vector forces that cancel with one another
to some high precision. By construction such theories would be able to evade
detection in Eotvos experiments that utilize matter while still allowing for a
signal in antimatter experiments. Even taking such cancellation for granted,
however, we show that the radiative damping of binary pulsar systems constrains
these forces to be significantly weaker than gravity. Furthermore we show that
there are limits to the accuracy with which such cancellation can be arranged:
first by determining the precision to which scalar charges can track vector
charges in the best candidate theories; and, second, by showing that the
different velocity dependence of scalar and vector forces necessarily
introduces non-cancellation at a quantifiable level.
| [
{
"created": "Thu, 23 Jul 2009 19:11:41 GMT",
"version": "v1"
}
] | 2009-07-24 | [
[
"Alves",
"Daniele S. M.",
""
],
[
"Jankowiak",
"Martin",
""
],
[
"Saraswat",
"Prashant",
""
]
] | In light of recent experimental proposals to measure the free fall acceleration of antihydrogen in the earth's gravitational field, we investigate the bounds that existing experiments place on any asymmetry between the free fall of matter and antimatter. We conclude that existing experiments constrain any such asymmetry to be less than about 10^-7. First we consider contributions to the inertial masses of atoms that encode the presence of antimatter and use precision Eotvos experiments to establish the level at which they satisfy the equivalence principle. In particular we focus on vacuum polarization effects and the antiquark content of nucleons. Second we consider a class of theories that contain long range scalar and vector forces that cancel with one another to some high precision. By construction such theories would be able to evade detection in Eotvos experiments that utilize matter while still allowing for a signal in antimatter experiments. Even taking such cancellation for granted, however, we show that the radiative damping of binary pulsar systems constrains these forces to be significantly weaker than gravity. Furthermore we show that there are limits to the accuracy with which such cancellation can be arranged: first by determining the precision to which scalar charges can track vector charges in the best candidate theories; and, second, by showing that the different velocity dependence of scalar and vector forces necessarily introduces non-cancellation at a quantifiable level. |
hep-ph/9710549 | null | A. Abada, O. Azi and A. Tadji | Damping rate for transverse gluons with finite soft momentum in hot QCD | 13 pages, TeX file. References updated, misprints corrected and minor
changes | null | null | ENSK-ph/97-02 | hep-ph | null | We calculate the damping rate for transverse gluons with {\nineti finite}
soft momentum to leading order in perturbative hot QCD. The internal momenta of
the one-loop contributing diagrams are soft. This means we have to use
effective vertices and propagators which incorporate the so-called hard thermal
loops. We expand the damping rate in powers of the incoming momentum and argue
that the series ought to converge within a finite radius of convergence. We
contrast such a behavior with the one obtained from a previous calculation that
produced a logarithmic behavior, a calculation based on letting the gluon
momentum come from the hard limit down towards the interior of the soft region.
This difference in behavior may point to interesting physics around some
`critical' region.
| [
{
"created": "Thu, 30 Oct 1997 21:53:16 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 1997 21:48:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Abada",
"A.",
""
],
[
"Azi",
"O.",
""
],
[
"Tadji",
"A.",
""
]
] | We calculate the damping rate for transverse gluons with {\nineti finite} soft momentum to leading order in perturbative hot QCD. The internal momenta of the one-loop contributing diagrams are soft. This means we have to use effective vertices and propagators which incorporate the so-called hard thermal loops. We expand the damping rate in powers of the incoming momentum and argue that the series ought to converge within a finite radius of convergence. We contrast such a behavior with the one obtained from a previous calculation that produced a logarithmic behavior, a calculation based on letting the gluon momentum come from the hard limit down towards the interior of the soft region. This difference in behavior may point to interesting physics around some `critical' region. |
0807.2329 | Dremin | I.M. Dremin | In-medium QCD and Cherenkov gluons vs Mach waves at LHC | 6 p., no figures. Talk at the HERA-LHC workshop, 28 May 2008, CERN | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equations of in-medium gluodynamics are proposed. Their classical lowest
order solution is explicitly shown for a color charge moving with constant
speed. For nuclear permittivity larger than 1 it describes the shock wave
induced by emission of Cherenkov gluons. Specific effects at LHC energies are
described and compared with Mach wave predictions.
| [
{
"created": "Tue, 15 Jul 2008 10:06:47 GMT",
"version": "v1"
}
] | 2008-07-21 | [
[
"Dremin",
"I. M.",
""
]
] | The equations of in-medium gluodynamics are proposed. Their classical lowest order solution is explicitly shown for a color charge moving with constant speed. For nuclear permittivity larger than 1 it describes the shock wave induced by emission of Cherenkov gluons. Specific effects at LHC energies are described and compared with Mach wave predictions. |
hep-ph/0701141 | Valery Zamiralov | E.N.Dubovik, V.S.Zamiralov, S.N.Lepshokov | Weak radiative hyperon decays in quark model | 12 pages, 5 tables, 5 figures | AIPConf.Proc.964:71-76,2007 | 10.1063/1.2823883 | null | hep-ph | null | Weak radiative hyperon decays are considered in the framework of a quark
model. The phenomenological model includes 1-quark transitions with the
effective $sd\gamma$-vertex and 2-quark ones with the W-exchange $s+u\to
u+d+\gamma$ and turns out to describe well the data and gives predictions for
asymmetry of the decays $\Lambda\to n+\gamma$ and $\Xi^-\to \Sigma^- +\gamma$.
| [
{
"created": "Thu, 18 Jan 2007 11:36:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dubovik",
"E. N.",
""
],
[
"Zamiralov",
"V. S.",
""
],
[
"Lepshokov",
"S. N.",
""
]
] | Weak radiative hyperon decays are considered in the framework of a quark model. The phenomenological model includes 1-quark transitions with the effective $sd\gamma$-vertex and 2-quark ones with the W-exchange $s+u\to u+d+\gamma$ and turns out to describe well the data and gives predictions for asymmetry of the decays $\Lambda\to n+\gamma$ and $\Xi^-\to \Sigma^- +\gamma$. |
hep-ph/9610349 | Thorsten Ohl | Thorsten Ohl (TH Darmstadt) | Electroweak Event Generators for LEP2 and the Linear Collider | 18 pages, LaTeX, to appear in the proceedings of CRAD'96, Third
International Symposium on Radiative Corrections, Cracow, August 1-5, 1996 | Acta Phys.Polon.B28:847-862,1997 | null | IKDA 96/21 | hep-ph | null | I discuss the state of the art and outline direction for research in event
generation for electroweak physics at LEP2 and e+e- Linear Colliders.
| [
{
"created": "Mon, 14 Oct 1996 12:07:01 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Ohl",
"Thorsten",
"",
"TH Darmstadt"
]
] | I discuss the state of the art and outline direction for research in event generation for electroweak physics at LEP2 and e+e- Linear Colliders. |
1704.08937 | Oleg Lebedev | Oleg Lebedev | Moriond QCD 2017: theoretical summary | 9 pages, 5 figures; to appear in the proceedings of Moriond QCD 2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I summarize the highlights of the theory talks at the 52nd Rencontres de
Moriond: QCD and high energy interactions.
| [
{
"created": "Fri, 28 Apr 2017 13:56:57 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2017 12:42:28 GMT",
"version": "v2"
}
] | 2017-05-11 | [
[
"Lebedev",
"Oleg",
""
]
] | I summarize the highlights of the theory talks at the 52nd Rencontres de Moriond: QCD and high energy interactions. |
hep-ph/9404352 | null | Keith A. Olive | Big Bang Baryogenesis | 36 pages, LaTeX, UMN-TH-1249, Lectures given at the 33rd
International Winter School on Nuclear and Particle Physics, ``Matter Under
Extreme Conditions", Feb. 27 - March 5 1994, Schladming Austria | null | 10.1007/3-540-58689-X_40 | null | hep-ph astro-ph | null | An overview of baryogenesis in the early Universe is presented. The standard
big bang model including big bang nucleosynthesis and inflation is breifly
reviewed. Three basic models for baryogenesis will be developed: The
``standard" out-of-equilibrium decay model; the decay of scalar consensates
along flat directions in supersymmetric models; and lepto-baryogenesis, which
is the conversion of a lepton asymmetry into a baryon asymmetry via
non-perturbative electroweak interactions.
| [
{
"created": "Thu, 28 Apr 1994 17:10:25 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Olive",
"Keith A.",
""
]
] | An overview of baryogenesis in the early Universe is presented. The standard big bang model including big bang nucleosynthesis and inflation is breifly reviewed. Three basic models for baryogenesis will be developed: The ``standard" out-of-equilibrium decay model; the decay of scalar consensates along flat directions in supersymmetric models; and lepto-baryogenesis, which is the conversion of a lepton asymmetry into a baryon asymmetry via non-perturbative electroweak interactions. |
hep-ph/9602288 | Paolo Nason | P. Nason, B.R. Webber, D.Ward, D. Lanske, L.A. del Pozo, F. Fabbri, B.
Poli, G.Cowan, C.Padilla, M. Seymour, F. Hautmann, Yu.L. Dokshitzer and V.A.
Khoze | QCD | 44 pages, Latex, epsfig, 18 figures, to appear on the Report of the
Workshop on Physics at LEP2, CERN 96-01, vol. 1, 1996 | null | null | null | hep-ph | null | We discuss QCD studies that will be possible at LEP2. We examine both
experimental and theoretical aspects of jets, fragmentation functions,
multiplicities and particle spectra.
| [
{
"created": "Tue, 13 Feb 1996 13:02:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nason",
"P.",
""
],
[
"Webber",
"B. R.",
""
],
[
"Ward",
"D.",
""
],
[
"Lanske",
"D.",
""
],
[
"del Pozo",
"L. A.",
""
],
[
"Fabbri",
"F.",
""
],
[
"Poli",
"B.",
""
],
[
"Cowan",
"G.",
""
],
[
"Padilla",
"C.",
""
],
[
"Seymour",
"M.",
""
],
[
"Hautmann",
"F.",
""
],
[
"Dokshitzer",
"Yu. L.",
""
],
[
"Khoze",
"V. A.",
""
]
] | We discuss QCD studies that will be possible at LEP2. We examine both experimental and theoretical aspects of jets, fragmentation functions, multiplicities and particle spectra. |
2009.00301 | Ivan Truten | I.V. Truten, A.Yu. Korchin | Energy and angular distributions of the bottom quark in the
electron-positron annihilation $e^+e^-\to b \, W^+ \, \bar{t}$ | 16 pages, 7 figures, ws-ijmpa style; v3: Appendix A with discussion
of gauge invariance and a few references added, published version | Int. J. Mod. Phys. A 36, No. 02, 2150013 (2021) | 10.1142/S0217751X21500135 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The distributions of the bottom quark in the process $e^+ e^- \to t \,
\bar{t} \to b \, W^+ \, \bar{t}$ are considered at the $e^+ e^-$ energy
corresponding to the first construction stage of the Compact Linear Collider.
The cross sections of $e^+ e^- \to b \ldots$, as functions of the $b$-quark
energy and angle with respect to the direction of the electron beam, are
derived and calculated. The effects of physics beyond the Standard Model are
included via the modified $\gamma t \bar{t}$ and $Z t \bar{t}$ couplings which
naturally appear in effective field theories. In addition to the cross
sections, the energy and angular asymmetries are calculated. The dependence of
these observables on the $e^+ e^-$ energy is calculated, and features of this
dependence are investigated.
| [
{
"created": "Tue, 1 Sep 2020 09:12:19 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Sep 2020 11:58:02 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Feb 2021 16:02:20 GMT",
"version": "v3"
}
] | 2021-02-25 | [
[
"Truten",
"I. V.",
""
],
[
"Korchin",
"A. Yu.",
""
]
] | The distributions of the bottom quark in the process $e^+ e^- \to t \, \bar{t} \to b \, W^+ \, \bar{t}$ are considered at the $e^+ e^-$ energy corresponding to the first construction stage of the Compact Linear Collider. The cross sections of $e^+ e^- \to b \ldots$, as functions of the $b$-quark energy and angle with respect to the direction of the electron beam, are derived and calculated. The effects of physics beyond the Standard Model are included via the modified $\gamma t \bar{t}$ and $Z t \bar{t}$ couplings which naturally appear in effective field theories. In addition to the cross sections, the energy and angular asymmetries are calculated. The dependence of these observables on the $e^+ e^-$ energy is calculated, and features of this dependence are investigated. |
1006.3562 | Juan Gonzalez-Fraile | O. J. P. Eboli, J. Gonzalez-Fraile, M. C. Gonzalez-Garcia | Scrutinizing the ZW+W- vertex at the Large Hadron Collider at 7 TeV | 12 pages, 3 figures. One reference added, matches published version | Phys.Lett.B692:20-25,2010 | 10.1016/j.physletb.2010.07.013 | YITP-SB-10--23 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the potential of the CERN Large Hadron Collider running at 7 TeV
to search for deviations from the Standard Model predictions for the triple
gauge boson coupling ZW+W- assuming an integrated luminosity of 1 fb^{-1}. We
show that the study of W+W- and W^\pm Z productions, followed by the leptonic
decay of the weak gauge bosons can improve the present sensitivity on the
anomalous couplings \Delta g_1^Z, \Delta \kappa_Z, \lambda_Z, g_4^Z, and
\tilde{\lambda}_Z at the 2\sigma level.
| [
{
"created": "Thu, 17 Jun 2010 20:00:23 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2011 09:36:54 GMT",
"version": "v2"
}
] | 2011-06-30 | [
[
"Eboli",
"O. J. P.",
""
],
[
"Gonzalez-Fraile",
"J.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
]
] | We analyze the potential of the CERN Large Hadron Collider running at 7 TeV to search for deviations from the Standard Model predictions for the triple gauge boson coupling ZW+W- assuming an integrated luminosity of 1 fb^{-1}. We show that the study of W+W- and W^\pm Z productions, followed by the leptonic decay of the weak gauge bosons can improve the present sensitivity on the anomalous couplings \Delta g_1^Z, \Delta \kappa_Z, \lambda_Z, g_4^Z, and \tilde{\lambda}_Z at the 2\sigma level. |
hep-ph/9812535 | Vassilis Spanos | A. B. Lahanas, V. C. Spanos and Vasilios Zarikas (Univ of Athens) | Charge asymmetry in two-Higgs doublet models | 20 pages, LaTeX file, 5 eps figures included using epsfig macro.
Major revision | Phys.Lett.B472:119,2000 | 10.1016/S0370-2693(99)01400-8 | null | hep-ph | null | We discuss the features of a two-Higgs doublet model exhibiting a two stage
phase transition. At finite temperatures electric charge violating stationary
points are developed. In conjunction with {\em CP} violation in the Higgs or
the Yukawa sector, the phase transition to the charge conserving vacuum,
generates a net charge asymmetry $\Delta Q$, in the presence of heavy leptons,
which may be well above the astrophysical bounds put on $\Delta Q$ unless the
heavy leptons are sufficiently massive. This type of transition may be of
relevance for supersymmetric extensions of the Standard Model, since it shares
the same features, namely two Higgs doublets and similar {\em CP} violating
sources.
| [
{
"created": "Thu, 31 Dec 1998 14:24:14 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jan 1999 12:04:55 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Oct 1999 17:47:15 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Lahanas",
"A. B.",
"",
"Univ of Athens"
],
[
"Spanos",
"V. C.",
"",
"Univ of Athens"
],
[
"Zarikas",
"Vasilios",
"",
"Univ of Athens"
]
] | We discuss the features of a two-Higgs doublet model exhibiting a two stage phase transition. At finite temperatures electric charge violating stationary points are developed. In conjunction with {\em CP} violation in the Higgs or the Yukawa sector, the phase transition to the charge conserving vacuum, generates a net charge asymmetry $\Delta Q$, in the presence of heavy leptons, which may be well above the astrophysical bounds put on $\Delta Q$ unless the heavy leptons are sufficiently massive. This type of transition may be of relevance for supersymmetric extensions of the Standard Model, since it shares the same features, namely two Higgs doublets and similar {\em CP} violating sources. |
hep-ph/0104307 | Juan M. Nieves Pamplona | Juan Nieves and Enrique Ruiz Arriola | The $S_{11}- N$(1535) and $-N$(1650) Resonances in Meson-Baryon
Unitarized Coupled Channel Chiral Perturbation Theory | 35 pages, LaTeX + 7 ps-figure files. Some minor mistakes have been
corrected for and a new appendix discussing the matching to HBChPT has been
also added | Phys.Rev. D64 (2001) 116008 | 10.1103/PhysRevD.64.116008 | UG-DFM-10/01 | hep-ph nucl-th | null | The $s-$wave meson-baryon scattering is analyzed for the strangeness S=0
sector in a Bethe-Salpeter coupled channel formalism incorporating Chiral
Symmetry. Four channels have been considered: $\pi N$, $\eta N$, $K \Lambda$,
$K \Sigma$. The needed two particle irreducible matrix amplitude is taken from
lowest order Chiral Perturbation Theory in a relativistic formalism and low
energy constants are fitted to the elastic $\pi N $ phase-shifts and the $\pi^-
p \to \eta n$ and $\pi^- p \to K^0 \Lambda$ cross section data. The position of
the complex poles in the second Riemann sheet of the scattering amplitude
determine masses and widths of the $S_{11}-$ $N$(1535) and $-N$(1650)
resonances, in reasonable agreement with experiment. A good overall description
of data, from $\pi N$ threshold up to 2 GeV, is achieved keeping in mind that
the two pion production channel has not been included.
| [
{
"created": "Mon, 30 Apr 2001 08:39:56 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2001 16:24:45 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Nieves",
"Juan",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] | The $s-$wave meson-baryon scattering is analyzed for the strangeness S=0 sector in a Bethe-Salpeter coupled channel formalism incorporating Chiral Symmetry. Four channels have been considered: $\pi N$, $\eta N$, $K \Lambda$, $K \Sigma$. The needed two particle irreducible matrix amplitude is taken from lowest order Chiral Perturbation Theory in a relativistic formalism and low energy constants are fitted to the elastic $\pi N $ phase-shifts and the $\pi^- p \to \eta n$ and $\pi^- p \to K^0 \Lambda$ cross section data. The position of the complex poles in the second Riemann sheet of the scattering amplitude determine masses and widths of the $S_{11}-$ $N$(1535) and $-N$(1650) resonances, in reasonable agreement with experiment. A good overall description of data, from $\pi N$ threshold up to 2 GeV, is achieved keeping in mind that the two pion production channel has not been included. |
hep-ph/0410184 | Mary Hall Reno | S. Kretzer (RIKEN-BNL and Brookhaven), M. H. Reno (Univ. of Iowa) | $\sigma_{DIS}(\nu N)$, NLO Perturbative QCD and O(1 GeV) Mass
Corrections | 6 pages, 7 figures, Talk given at 3rd International Workshop on
Neutrino Nucleus Interactions in the Few GeV Region (NuInt04), Gran Sasso,
Assergi, Italy, 17-21 Mar 2004 | null | 10.1016/j.nuclphysbps.2004.11.237 | null | hep-ph | null | The deep-inelastic neutrino-nucleon cross section is one of the components of
few GeV neutrino interactions. We present here our results for
neutrino-isoscalar nucleon charged current scattering including perturbative
next-to-leading order QCD corrections, target mass corrections, charm mass and
lepton mass corrections.
| [
{
"created": "Wed, 13 Oct 2004 04:09:23 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kretzer",
"S.",
"",
"RIKEN-BNL and Brookhaven"
],
[
"Reno",
"M. H.",
"",
"Univ. of Iowa"
]
] | The deep-inelastic neutrino-nucleon cross section is one of the components of few GeV neutrino interactions. We present here our results for neutrino-isoscalar nucleon charged current scattering including perturbative next-to-leading order QCD corrections, target mass corrections, charm mass and lepton mass corrections. |
0902.3718 | Bo-Qiang Ma | Jun She, Jiacai Zhu, Bo-Qiang Ma | Pretzelosity $h_{1T}^{\perp}$ and quark orbital angular momentum | 20 latex pages, 7 figures, to appear in PRD | Phys.Rev.D79:054008,2009 | 10.1103/PhysRevD.79.054008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the pretzelosity distribution ($h_{1T}^{\perp}$), which is one
of the eight leading twist transverse momentum dependent parton distributions
(TMDs), in the light-cone formalism. We find that this quantity has a simple
relation with the quark orbital angular momentum distribution, thus it may
provide a new possibility to access the quark orbital angular momentum inside
the nucleon. The pretzelosity distribution can manifest itself through the
$\sin(3\phi_h-\phi_S)$ asymmetry in semi-inclusive deep inelastic scattering
process. We calculate the $\sin(3\phi_h-\phi_S)$ asymmetry at HERMES, COMPASS
and JLab kinematics, and present our prediction on different targets including
the proton, deuteron and neutron targets. Inclusion of transverse momentum cut
in data analysis could significantly enhance the $\sin(3\phi_h-\phi_S)$
asymmetry for future measurements.
| [
{
"created": "Sat, 21 Feb 2009 05:15:54 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Mar 2009 11:58:55 GMT",
"version": "v2"
}
] | 2009-03-24 | [
[
"She",
"Jun",
""
],
[
"Zhu",
"Jiacai",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We calculate the pretzelosity distribution ($h_{1T}^{\perp}$), which is one of the eight leading twist transverse momentum dependent parton distributions (TMDs), in the light-cone formalism. We find that this quantity has a simple relation with the quark orbital angular momentum distribution, thus it may provide a new possibility to access the quark orbital angular momentum inside the nucleon. The pretzelosity distribution can manifest itself through the $\sin(3\phi_h-\phi_S)$ asymmetry in semi-inclusive deep inelastic scattering process. We calculate the $\sin(3\phi_h-\phi_S)$ asymmetry at HERMES, COMPASS and JLab kinematics, and present our prediction on different targets including the proton, deuteron and neutron targets. Inclusion of transverse momentum cut in data analysis could significantly enhance the $\sin(3\phi_h-\phi_S)$ asymmetry for future measurements. |
1505.05565 | Anibal Medina | Anibal D. Medina | SUSY Implications from WIMP Annihilation into Scalars at the Galactic
Center | 4 pages, 3 figures, proceedings of the HPNP2015 conference | null | null | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An excess in $\gamma$-rays emanating from the galactic centre has recently
been observed in the Fermi-LAT data. We investigate the new exciting
possibility of fitting the signal spectrum by dark matter annihilating
dominantly to a Higgs-pseudoscalar pair. We show that the fit to the
$\gamma$-ray excess for the Higgs-pseudoscalar channel can be just as good as
for annihilation into bottom-quark pairs. This channel arises naturally in a
full model such as the next-to-minimal supersymmetric Standard Model (NMSSM)
and we find regions where dark matter relic density, the $\gamma$-ray signal
and other experimental constraints, can all be satisfied simultaneously.
Annihilation into scalar pairs allows for the possibility of detecting the
Higgs or pseudoscalar decay into two photons, providing a smoking-gun signal of
the model.
| [
{
"created": "Thu, 21 May 2015 00:45:34 GMT",
"version": "v1"
}
] | 2015-05-22 | [
[
"Medina",
"Anibal D.",
""
]
] | An excess in $\gamma$-rays emanating from the galactic centre has recently been observed in the Fermi-LAT data. We investigate the new exciting possibility of fitting the signal spectrum by dark matter annihilating dominantly to a Higgs-pseudoscalar pair. We show that the fit to the $\gamma$-ray excess for the Higgs-pseudoscalar channel can be just as good as for annihilation into bottom-quark pairs. This channel arises naturally in a full model such as the next-to-minimal supersymmetric Standard Model (NMSSM) and we find regions where dark matter relic density, the $\gamma$-ray signal and other experimental constraints, can all be satisfied simultaneously. Annihilation into scalar pairs allows for the possibility of detecting the Higgs or pseudoscalar decay into two photons, providing a smoking-gun signal of the model. |
hep-ph/0412264 | Csaba Balazs | C. Balazs, M. Carena, A. Menon, D.E. Morrissey and C.E.M. Wagner | The Supersymmetric Origin of Matter | 30 pages, 14 figures | Phys.Rev.D71:075002,2005 | 10.1103/PhysRevD.71.075002 | ANL-HEP-PR-04-137, EFI-04-40, FERMILAB-PUB-04-397-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Minimal Supersymmetric extension of the Standard Model (MSSM) can provide
the correct neutralino relic abundance and baryon number asymmetry of the
universe. Both may be efficiently generated in the presence of CP violating
phases, light charginos and neutralinos, and a light top squark. Due to the
coannihilation of the neutralino with the light stop, we find a large region of
parameter space in which the neutralino relic density is consistent with WMAP
and SDSS data. We perform a detailed study of the additional constraints
induced when CP violating phases, consistent with the ones required for
baryogenesis, are included. We explore the possible tests of this scenario from
present and future electron Electric Dipole Moment (EDM) measurements, direct
neutralino detection experiments, collider searches and the b -> s gamma decay
rate. We find that the EDM constraints are quite severe and that electron EDM
experiments, together with stop searches at the Tevatron and Higgs searches at
the LHC, will provide a definite test of our scenario of electroweak
baryogenesis in the next few years.
| [
{
"created": "Fri, 17 Dec 2004 21:30:27 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jan 2009 22:32:17 GMT",
"version": "v2"
}
] | 2009-01-23 | [
[
"Balazs",
"C.",
""
],
[
"Carena",
"M.",
""
],
[
"Menon",
"A.",
""
],
[
"Morrissey",
"D. E.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] | The Minimal Supersymmetric extension of the Standard Model (MSSM) can provide the correct neutralino relic abundance and baryon number asymmetry of the universe. Both may be efficiently generated in the presence of CP violating phases, light charginos and neutralinos, and a light top squark. Due to the coannihilation of the neutralino with the light stop, we find a large region of parameter space in which the neutralino relic density is consistent with WMAP and SDSS data. We perform a detailed study of the additional constraints induced when CP violating phases, consistent with the ones required for baryogenesis, are included. We explore the possible tests of this scenario from present and future electron Electric Dipole Moment (EDM) measurements, direct neutralino detection experiments, collider searches and the b -> s gamma decay rate. We find that the EDM constraints are quite severe and that electron EDM experiments, together with stop searches at the Tevatron and Higgs searches at the LHC, will provide a definite test of our scenario of electroweak baryogenesis in the next few years. |
1506.07145 | Fedor Simkovic | Dusan Stefanik, Rastislav Dvornicky, Fedor Simkovic, Petr Vogel | The light neutrino exchange mechanism of the $0\nu\beta\beta$-decay with
left- and right-handed leptonic and hadronic currents revisited | 15 pages, 8 figures | Phys. Rev. C 92, 055502 (2015) | 10.1103/PhysRevC.92.055502 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The extension of Majorana neutrino mass mechanism of the neutrinoless
double-beta decay ($0\nu\beta\beta$) with the inclusion of right-handed
leptonic and hadronic currents is revisited. While only the exchange of light
neutrinos is assumed, the $s_{1/2}$ and $p_{1/2}$-states of emitted electrons
as well as recoil corrections to the nucleon currents are taken into account.
Within the standard approximations the decay rate is factorized into a sum of
products of kinematical phase-space factors, nuclear matrix elements and the
fundamental parameters that characterize the lepton number violation. Unlike in
the previous treatments the induced pseudoscalar term of hadron current is
included, resulting in additional nuclear matrix elements. An improved
numerical computation of the phase-space factors is presented, based on the
exact Dirac wave functions of the $s_{1/2}$ and $p_{1/2}$ electrons with finite
nuclear size and electron screening taken into account. The dependence of
values of these phase-space factors on the different approximation schemes used
in evaluation of electron wave functions is discussed. The upper limits for
effective neutrino mass and the parameters $\langle\lambda\rangle$ and
$\langle\eta\rangle$ characterizing the right-handed current mechanism are
deduced from data on the $0\nu\beta\beta$-decay of $^{76}$Ge and $^{136}$Xe
using nuclear matrix elements calculated within the nuclear shell model and
quasiparticle random phase approximation. The differential decay rates, i.e.
the angular correlations and the single electron energy distributions for
various combinations of the total lepton number violating parameters that can
help to disentangle the possible mechanism are described and discussed.
| [
{
"created": "Tue, 23 Jun 2015 19:14:34 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2015 16:10:19 GMT",
"version": "v2"
}
] | 2015-11-11 | [
[
"Stefanik",
"Dusan",
""
],
[
"Dvornicky",
"Rastislav",
""
],
[
"Simkovic",
"Fedor",
""
],
[
"Vogel",
"Petr",
""
]
] | The extension of Majorana neutrino mass mechanism of the neutrinoless double-beta decay ($0\nu\beta\beta$) with the inclusion of right-handed leptonic and hadronic currents is revisited. While only the exchange of light neutrinos is assumed, the $s_{1/2}$ and $p_{1/2}$-states of emitted electrons as well as recoil corrections to the nucleon currents are taken into account. Within the standard approximations the decay rate is factorized into a sum of products of kinematical phase-space factors, nuclear matrix elements and the fundamental parameters that characterize the lepton number violation. Unlike in the previous treatments the induced pseudoscalar term of hadron current is included, resulting in additional nuclear matrix elements. An improved numerical computation of the phase-space factors is presented, based on the exact Dirac wave functions of the $s_{1/2}$ and $p_{1/2}$ electrons with finite nuclear size and electron screening taken into account. The dependence of values of these phase-space factors on the different approximation schemes used in evaluation of electron wave functions is discussed. The upper limits for effective neutrino mass and the parameters $\langle\lambda\rangle$ and $\langle\eta\rangle$ characterizing the right-handed current mechanism are deduced from data on the $0\nu\beta\beta$-decay of $^{76}$Ge and $^{136}$Xe using nuclear matrix elements calculated within the nuclear shell model and quasiparticle random phase approximation. The differential decay rates, i.e. the angular correlations and the single electron energy distributions for various combinations of the total lepton number violating parameters that can help to disentangle the possible mechanism are described and discussed. |
1412.1603 | Reza Khosravi | R. Khosravi and D. Hatami | Decay constants and masses of light tensor mesons ($J^P =2^+$) | null | Int. J. Mod. Phys. A 30, 1550106 (2015) | 10.1142/S0217751X15501067 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the masses and decay constants of the light tensor mesons with
quantum numbers $J^P =2^+$ in the framework of the QCD sum rules in the
standard model. The non-perturbative contributions up to dimension-$5$ as
important terms of the operator product expansion are considered.
| [
{
"created": "Thu, 4 Dec 2014 10:08:42 GMT",
"version": "v1"
}
] | 2018-04-17 | [
[
"Khosravi",
"R.",
""
],
[
"Hatami",
"D.",
""
]
] | We calculate the masses and decay constants of the light tensor mesons with quantum numbers $J^P =2^+$ in the framework of the QCD sum rules in the standard model. The non-perturbative contributions up to dimension-$5$ as important terms of the operator product expansion are considered. |
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