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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9709385 | Alan R. White | Alan R. White | The VIIth Blois Workshop: Theory Summary and Factorization Issues | 12 pages, with 3 ps figures in the text. Presented at the
International Conference (VIIth Blois Workshop) On Elastic and Diffractive
Scattering - Recent Advances in Hadron Physics. Seoul, Korea. June 10-14,
1997 | null | null | ANL-HEP-CP-97-73 | hep-ph | null | Workshop presentations on elastic and diffractive scattering and other recent
advances in hadron physics are summarized. The role of ``factorization'' in
determining parton properties of the pomeron is particularly discussed.
| [
{
"created": "Thu, 18 Sep 1997 02:13:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"White",
"Alan R.",
""
]
] | Workshop presentations on elastic and diffractive scattering and other recent advances in hadron physics are summarized. The role of ``factorization'' in determining parton properties of the pomeron is particularly discussed. |
1002.3223 | Pedro David Ruiz-Femen\'ia | Andre Hoang, Christoph Reisser, Pedro Ruiz-Femenia | Phase Space Matching and Finite Lifetime Effects for Top-Pair Production
Close to Threshold | 62 pages, 21 figures | Phys.Rev.D82:014005,2010 | 10.1103/PhysRevD.82.014005 | MPP-2010-22, TKK-10-14, TPP10-15, SFB/CPP-10-18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The top-pair $t\bar t$ production cross section close to threshold in
$e^+e^-$ collisions is strongly affected by the small lifetime of the top
quark. Since the cross section is defined through final states containing the
top decay products, a consistent definition of the cross section depends on
prescriptions how these final states are accounted for the cross section.
Experimentally, these prescriptions are implemented for example through cuts on
kinematic quantities such as the reconstructed top quark invariant masses. As
long as these cuts do not reject final states that can arise from the decay of
a top and an anti-top quark with a small off-shellness compatible with the
nonrelativistic power-counting, they can be implemented through imaginary phase
space matching conditions in NRQCD. The prescription-dependent cross section
can then be determined from the optical theorem using the $e^+e^-$ forward
scattering amplitude. We compute the phase space matching conditions associated
to cuts on the top and anti-top invariant masses at next-to-next-to-leading
logarithmic (NNLL) order and partially at next-to-next-to-next-to-leading
logarithmic (N${}^3$LL) order in the nonrelativistic expansion and, together
with finite lifetime and electroweak effects known from previous work, analyze
their numerical impact on the $t\bar t$ cross section. We show that the phase
space matching contributions are essential to make reliable NRQCD predictions,
particularly for energies below the peak region, where the cross section is
small. We find that irreducible background contributions associated to final
states that do not come from top decays are strongly suppressed and can be
neglected for the theoretical predictions.
| [
{
"created": "Wed, 17 Feb 2010 16:59:35 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Hoang",
"Andre",
""
],
[
"Reisser",
"Christoph",
""
],
[
"Ruiz-Femenia",
"Pedro",
""
]
] | The top-pair $t\bar t$ production cross section close to threshold in $e^+e^-$ collisions is strongly affected by the small lifetime of the top quark. Since the cross section is defined through final states containing the top decay products, a consistent definition of the cross section depends on prescriptions how these final states are accounted for the cross section. Experimentally, these prescriptions are implemented for example through cuts on kinematic quantities such as the reconstructed top quark invariant masses. As long as these cuts do not reject final states that can arise from the decay of a top and an anti-top quark with a small off-shellness compatible with the nonrelativistic power-counting, they can be implemented through imaginary phase space matching conditions in NRQCD. The prescription-dependent cross section can then be determined from the optical theorem using the $e^+e^-$ forward scattering amplitude. We compute the phase space matching conditions associated to cuts on the top and anti-top invariant masses at next-to-next-to-leading logarithmic (NNLL) order and partially at next-to-next-to-next-to-leading logarithmic (N${}^3$LL) order in the nonrelativistic expansion and, together with finite lifetime and electroweak effects known from previous work, analyze their numerical impact on the $t\bar t$ cross section. We show that the phase space matching contributions are essential to make reliable NRQCD predictions, particularly for energies below the peak region, where the cross section is small. We find that irreducible background contributions associated to final states that do not come from top decays are strongly suppressed and can be neglected for the theoretical predictions. |
2405.19389 | Marco Gorghetto | Marco Gorghetto, Edward Hardy, Giovanni Villadoro | More Axion Stars from Strings | 23 pages + appendices | null | null | null | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that if dark matter consists of QCD axions in the post-inflationary
scenario more than ten percent of it efficiently collapses into Bose stars at
matter-radiation equality. Such a result is mostly independent of the present
uncertainties on the axion mass. This large population of solitons, with
asteroid masses and Earth-Moon distance sizes, might plausibly survive until
today, with potentially interesting implications for phenomenology and
experimental searches.
| [
{
"created": "Wed, 29 May 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-06-07 | [
[
"Gorghetto",
"Marco",
""
],
[
"Hardy",
"Edward",
""
],
[
"Villadoro",
"Giovanni",
""
]
] | We show that if dark matter consists of QCD axions in the post-inflationary scenario more than ten percent of it efficiently collapses into Bose stars at matter-radiation equality. Such a result is mostly independent of the present uncertainties on the axion mass. This large population of solitons, with asteroid masses and Earth-Moon distance sizes, might plausibly survive until today, with potentially interesting implications for phenomenology and experimental searches. |
2307.12568 | Raghunath Sahoo | Kamaljeet Singh, Jayanta Dey, and Raghunath Sahoo | Thermal conductivity of evolving quark-gluon plasma in the presence of a
time-varying magnetic field | Same as the published version in Phys. Rev D | Phys. Rev. D 109, 014018 (2024) | 10.1103/PhysRevD.109.014018 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by-sa/4.0/ | The effect of the temperature evolution of QGP on its thermal conductivity
and elliptic flow is investigated here in the presence of a time-varying
magnetic field. Thermal conductivity plays a vital role in the cooling rate of
the medium or its temperature evolution. The magnetic field produced during the
early stages of (non-central) heavy-ion collisions decays with time, where
electrical conductivity plays a significant role. As the medium expands, the
electrical and thermal properties change, reflecting the effect in various
observables. In this study, we have calculated the thermal conductivity of the
QGP medium, incorporating the effects of temperature and magnetic field
evolution. We discovered that conductivity significantly depends on the cooling
rate, and its value increases due to temperature evolution. Furthermore, the
influence of these evolutions on the elliptic flow coefficient is measured, and
elliptic flow decreases due to the evolution. We also extend our study for the
case of Gubser flow, where, along with the longitudinal Bjorken expansion, the
radially transverse expansion is also present.
| [
{
"created": "Mon, 24 Jul 2023 07:26:09 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2024 06:21:04 GMT",
"version": "v2"
}
] | 2024-01-19 | [
[
"Singh",
"Kamaljeet",
""
],
[
"Dey",
"Jayanta",
""
],
[
"Sahoo",
"Raghunath",
""
]
] | The effect of the temperature evolution of QGP on its thermal conductivity and elliptic flow is investigated here in the presence of a time-varying magnetic field. Thermal conductivity plays a vital role in the cooling rate of the medium or its temperature evolution. The magnetic field produced during the early stages of (non-central) heavy-ion collisions decays with time, where electrical conductivity plays a significant role. As the medium expands, the electrical and thermal properties change, reflecting the effect in various observables. In this study, we have calculated the thermal conductivity of the QGP medium, incorporating the effects of temperature and magnetic field evolution. We discovered that conductivity significantly depends on the cooling rate, and its value increases due to temperature evolution. Furthermore, the influence of these evolutions on the elliptic flow coefficient is measured, and elliptic flow decreases due to the evolution. We also extend our study for the case of Gubser flow, where, along with the longitudinal Bjorken expansion, the radially transverse expansion is also present. |
1708.01256 | Giulia Zanderighi | Aneesh V. Manohar, Paolo Nason, Gavin P. Salam, Giulia Zanderighi | The Photon Content of the Proton | 75 pages, 25 figures, data files corresponding to the figures
available at http://doi.org/10.5281/zenodo.837233, LUXqed17 PDF files
available in LHAPDF, references added in v2 | null | 10.1007/JHEP12(2017)046 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon PDF of the proton is needed for precision comparisons of LHC cross
sections with theoretical predictions. In a recent paper, we showed how the
photon PDF could be determined in terms of the electromagnetic proton structure
functions $F_2$ and $F_L$ measured in electron-proton scattering experiments,
and gave an explicit formula for the PDF including all terms up to
next-to-leading order. In this paper we give details of the derivation. We
obtain the photon PDF using the factorisation theorem and applying it to
suitable BSM hard scattering processes. We also obtain the same PDF in a
process-independent manner using the usual definition of PDFs in terms of
light-cone Fourier transforms of products of operators. We show how our method
gives an exact representation for the photon PDF in terms of $F_2$ and $F_L$,
valid to all orders in QED and QCD, and including all non-perturbative
corrections. This representation is then used to give an explicit formula for
the photon PDF to one order higher than our previous result. We also generalise
our results to obtain formul\ae\ for the polarised photon PDF, as well as the
photon TMDPDF. Using our formula, we derive the $P_{\gamma i}$ subset of DGLAP
splitting functions to order $\alpha \alpha_s$ and $\alpha^2$, which agree with
known results. We give a detailed explanation of the approach that we follow to
determine a photon PDF and its uncertainty within the above framework.
| [
{
"created": "Thu, 3 Aug 2017 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Aug 2017 11:23:39 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Manohar",
"Aneesh V.",
""
],
[
"Nason",
"Paolo",
""
],
[
"Salam",
"Gavin P.",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | The photon PDF of the proton is needed for precision comparisons of LHC cross sections with theoretical predictions. In a recent paper, we showed how the photon PDF could be determined in terms of the electromagnetic proton structure functions $F_2$ and $F_L$ measured in electron-proton scattering experiments, and gave an explicit formula for the PDF including all terms up to next-to-leading order. In this paper we give details of the derivation. We obtain the photon PDF using the factorisation theorem and applying it to suitable BSM hard scattering processes. We also obtain the same PDF in a process-independent manner using the usual definition of PDFs in terms of light-cone Fourier transforms of products of operators. We show how our method gives an exact representation for the photon PDF in terms of $F_2$ and $F_L$, valid to all orders in QED and QCD, and including all non-perturbative corrections. This representation is then used to give an explicit formula for the photon PDF to one order higher than our previous result. We also generalise our results to obtain formul\ae\ for the polarised photon PDF, as well as the photon TMDPDF. Using our formula, we derive the $P_{\gamma i}$ subset of DGLAP splitting functions to order $\alpha \alpha_s$ and $\alpha^2$, which agree with known results. We give a detailed explanation of the approach that we follow to determine a photon PDF and its uncertainty within the above framework. |
2405.13332 | Georgii Shestakov | N. N. Achasov and G. N. Shestakov | Qualitative explanation of the data on the decays $D^0\to
a_0(980)^\pm\pi^\mp$ and $D^+\to a_0(980)^{+(0)}\pi^{0(+)}$ in the four-quark
model of the $a_0(980)$ resonance | 4 pages, 5 figures, v2, clarifications and references added,
published in Phys. Rev. D | Phys. Rev. D 110, 016025 (2024) | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the values of the ratios $\mathcal{B}(D^0\to
a_0(980)^+\pi^-)/\mathcal{B} (D^0\to a_0(980)^-\pi^+ )$ and $\mathcal{B}(D^+\to
a_0(980)^+\pi^0)/\mathcal{B} (D^+\to a_0(980)^0 \pi^+)$, recently measured by
the BESIII Collaboration, are naturally explained in the four-quark model of
the $a_0(980) $ resonance.
| [
{
"created": "Wed, 22 May 2024 04:26:19 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 15:23:37 GMT",
"version": "v2"
}
] | 2024-07-26 | [
[
"Achasov",
"N. N.",
""
],
[
"Shestakov",
"G. N.",
""
]
] | It is shown that the values of the ratios $\mathcal{B}(D^0\to a_0(980)^+\pi^-)/\mathcal{B} (D^0\to a_0(980)^-\pi^+ )$ and $\mathcal{B}(D^+\to a_0(980)^+\pi^0)/\mathcal{B} (D^+\to a_0(980)^0 \pi^+)$, recently measured by the BESIII Collaboration, are naturally explained in the four-quark model of the $a_0(980) $ resonance. |
hep-ph/0007165 | Yang Jin-min | Jin Min Yang, Bing-Lin Young | Searching for a stop-pair sample from top counting experiments at hadron
colliders | 17 pages, 4 figures | Phys.Rev. D62 (2000) 115002 | 10.1103/PhysRevD.62.115002 | AMES-HET-00-05 | hep-ph hep-ex | null | The light stop pair if produced in hadron colliders and decaying through the
likely decay chain stop->chargino + b followed by chargino->neutralino + f f',
can mimic closely a top quark event when the mass of the stop is close to that
of the top quark. Because of the much lower production rate, the stop event can
be buried under the top quark event sample. In order to uncover the stop event,
specific selection cuts need to be applied. Through Monte Carlo simulation with
suitable kinematic cuts, we found that such stop event can be extracted from
the top quark sample and detected by the top quark counting experiments in the
upcoming upgraded Tevatron and LHC. However, because of the small statistics of
the Run 1 of the Tevatron, the stop signal remains hidden at Run 1.
| [
{
"created": "Sun, 16 Jul 2000 13:54:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Yang",
"Jin Min",
""
],
[
"Young",
"Bing-Lin",
""
]
] | The light stop pair if produced in hadron colliders and decaying through the likely decay chain stop->chargino + b followed by chargino->neutralino + f f', can mimic closely a top quark event when the mass of the stop is close to that of the top quark. Because of the much lower production rate, the stop event can be buried under the top quark event sample. In order to uncover the stop event, specific selection cuts need to be applied. Through Monte Carlo simulation with suitable kinematic cuts, we found that such stop event can be extracted from the top quark sample and detected by the top quark counting experiments in the upcoming upgraded Tevatron and LHC. However, because of the small statistics of the Run 1 of the Tevatron, the stop signal remains hidden at Run 1. |
hep-ph/0303064 | Lisi Eligio | G.L. Fogli, E. Lisi, A. Marrone (U. of Bari & INFN, Bari), D.
Montanino (U. of Lecce and INFN, Lecce) | Status of atmospheric neutrino(mu)<-->neutrino(tau) oscillations and
decoherence after the first K2K spectral data | 18 pages (RevTeX) + 12 figures (PostScript) | Phys.Rev.D67:093006,2003 | 10.1103/PhysRevD.67.093006 | null | hep-ph | null | We review the status of nu_mu-->nu_tau flavor transitions of atmospheric
neutrinos in the 92 kton-year data sample collected in the first phase of the
Super-Kamiokande (SK) experiment, in combination with the recent spectral data
from the KEK-to-Kamioka (K2K) accelerator experiment (including 29 single-ring
muon events). We consider a theoretical framework which embeds flavor
oscillations plus hypothetical decoherence effects, and where both standard
oscillations and pure decoherence represent limiting cases. It is found that
standard oscillations provide the best description of the SK+K2K data, and that
the associated mass-mixing parameters are determined at 1 sigma (and d.o.f.=1)
as: Delta m^2=(2.6 +- 0.4)x10^{-3} eV^2 and sin^2(2theta)=1.00+0.00-0.05. As
compared with standard oscillations, the case of pure decoherence is
disfavored, although it cannot be ruled out yet. In the general case,
additional decoherence effects in the nu_mu-->nu_tau channel do not improve the
fit to the SK and K2K data, and upper bounds can be placed on the associated
decoherence parameter. Such indications, presently dominated by SK, could be
strengthened by further K2K data, provided that the current spectral features
are confirmed with higher statistics. A detailed description of the statistical
analysis of SK and K2K data is also given, using the so-called ``pull''
approach to systematic uncertainties.
| [
{
"created": "Fri, 7 Mar 2003 20:03:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fogli",
"G. L.",
"",
"U. of Bari & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"U. of Bari & INFN, Bari"
],
[
"Marrone",
"A.",
"",
"U. of Bari & INFN, Bari"
],
[
"Montanino",
"D.",
"",
"U. of Lecce and INFN, Lecce"
]
] | We review the status of nu_mu-->nu_tau flavor transitions of atmospheric neutrinos in the 92 kton-year data sample collected in the first phase of the Super-Kamiokande (SK) experiment, in combination with the recent spectral data from the KEK-to-Kamioka (K2K) accelerator experiment (including 29 single-ring muon events). We consider a theoretical framework which embeds flavor oscillations plus hypothetical decoherence effects, and where both standard oscillations and pure decoherence represent limiting cases. It is found that standard oscillations provide the best description of the SK+K2K data, and that the associated mass-mixing parameters are determined at 1 sigma (and d.o.f.=1) as: Delta m^2=(2.6 +- 0.4)x10^{-3} eV^2 and sin^2(2theta)=1.00+0.00-0.05. As compared with standard oscillations, the case of pure decoherence is disfavored, although it cannot be ruled out yet. In the general case, additional decoherence effects in the nu_mu-->nu_tau channel do not improve the fit to the SK and K2K data, and upper bounds can be placed on the associated decoherence parameter. Such indications, presently dominated by SK, could be strengthened by further K2K data, provided that the current spectral features are confirmed with higher statistics. A detailed description of the statistical analysis of SK and K2K data is also given, using the so-called ``pull'' approach to systematic uncertainties. |
hep-ph/9607236 | Lee Jungil | Seungwon Baek (Seoul National Univ.), P. Ko (Hong-Ik Univ), Jungil Lee
and H. S. Song (Seoul National Univ.) | Color-octet heavy quarkonium productions in Z0 decays at LEP | 16 pages, LaTeX using revtex and epsfig. The version to appear in
Phys. Lett. B. With more discussions on the angular distributions. Some
references added and updated | Phys.Lett. B389 (1996) 609-615 | 10.1016/S0370-2693(96)01313-5 | SNUTP-96-061 | hep-ph | null | We consider the energy and the polar angle distributions of J/\psi's produced
via the color-singlet and the color-octet (^3S_1^{(8)}) mechanisms in Z^0 \to
J/\psi +X at LEP. Since both distributions of the J/\psi produced via
color-octet mechanism are significantly different from those via color-singlet
mechanism, these observables can be used as tests of color-octet production
mechanism for heavy quarkonia. We also discuss Z^0 \rightarrow \Upsilon + X and
W \to J/\psi ( or \Upsilon) + X in brief.
| [
{
"created": "Thu, 4 Jul 1996 10:08:04 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 1996 14:53:58 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Baek",
"Seungwon",
"",
"Seoul National Univ."
],
[
"Ko",
"P.",
"",
"Hong-Ik Univ"
],
[
"Lee",
"Jungil",
"",
"Seoul National Univ."
],
[
"Song",
"H. S.",
"",
"Seoul National Univ."
]
] | We consider the energy and the polar angle distributions of J/\psi's produced via the color-singlet and the color-octet (^3S_1^{(8)}) mechanisms in Z^0 \to J/\psi +X at LEP. Since both distributions of the J/\psi produced via color-octet mechanism are significantly different from those via color-singlet mechanism, these observables can be used as tests of color-octet production mechanism for heavy quarkonia. We also discuss Z^0 \rightarrow \Upsilon + X and W \to J/\psi ( or \Upsilon) + X in brief. |
hep-ph/9604232 | Jonathan Bagger | Jonathan A. Bagger | Weak-Scale Supersymmetry: Theory and Practice | 51 pages, Lectures delivered TASI-95 | null | null | JHU-TIPAC-96008 | hep-ph hep-th | null | These lectures contain an introduction to the theory and practice of
weak-scale supersymmetry. They begin with a discussion of the hierarchy problem
and the motivation for weak-scale supersymmetry. They continue by developing
the coset approach to superfields. They use superfield techniques to construct
the minimal supersymmetric version of the standard model and to discuss soft
supersymmetry breaking and its implications. The lectures end with a brief
survey of expectations for future collider experiments.
| [
{
"created": "Wed, 3 Apr 1996 16:09:33 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 1996 13:51:12 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Bagger",
"Jonathan A.",
""
]
] | These lectures contain an introduction to the theory and practice of weak-scale supersymmetry. They begin with a discussion of the hierarchy problem and the motivation for weak-scale supersymmetry. They continue by developing the coset approach to superfields. They use superfield techniques to construct the minimal supersymmetric version of the standard model and to discuss soft supersymmetry breaking and its implications. The lectures end with a brief survey of expectations for future collider experiments. |
0905.3069 | HongWei Ke | Zheng-Tao Wei, Hong-Wei Ke, Xiao-Feng Yang | Interpretation of the "$f_{D_s}$ puzzle" in SM and beyond | 16 pages, 6 figures, be accepted by PRD | Phys.Rev.D80:015022,2009 | 10.1103/PhysRevD.80.015022 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent measurement on the decay constant of $D_s$ shows a discrepancy
between theory and experiment. We study the leptonic and semileptonic decays of
$D$ and $D_s$ simultaneously within the standard model by employing a
lightfront quark model. There is space by tuning phenomenological parameters
which can explain the "$f_{D_s}$ puzzle" and do not contradict other
experiments on the semileptonic decays. We also investigate the leptonic decays
of D and $D_{s}$ with a new physics scenario, unparticle physics. The
unparticle effects induce a constructive interference with the standard model
contribution. The nontrivial phase in unparticle physics could produce direct
CP violation which may distinguish it from other new physics scenarios.
| [
{
"created": "Tue, 19 May 2009 11:42:08 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2009 08:14:36 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jul 2009 03:33:08 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Jul 2009 08:12:23 GMT",
"version": "v4"
}
] | 2009-09-02 | [
[
"Wei",
"Zheng-Tao",
""
],
[
"Ke",
"Hong-Wei",
""
],
[
"Yang",
"Xiao-Feng",
""
]
] | The recent measurement on the decay constant of $D_s$ shows a discrepancy between theory and experiment. We study the leptonic and semileptonic decays of $D$ and $D_s$ simultaneously within the standard model by employing a lightfront quark model. There is space by tuning phenomenological parameters which can explain the "$f_{D_s}$ puzzle" and do not contradict other experiments on the semileptonic decays. We also investigate the leptonic decays of D and $D_{s}$ with a new physics scenario, unparticle physics. The unparticle effects induce a constructive interference with the standard model contribution. The nontrivial phase in unparticle physics could produce direct CP violation which may distinguish it from other new physics scenarios. |
1602.00516 | Giorgio Busoni | Giorgio Busoni | Large Extra Dimensions at LHC Run 2 | 8 pages, 3 figures. References added, corrected figure 3, added
projected sensitivity for parameter M_T | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I extract new limits on the coefficient of the effective operator generated
by tree-level graviton exchange in large extra dimensions from $pp \rightarrow
jj$ angular distributions at LHC: $M_T > 6.8$ TeV (CMS after $2.6 fb^{-1}$ of
integrated luminosity) and $M_T > 8.3$ TeV (ATLAS after $3.6 fb^{-1}$). I also
compare such limits to the ones obtained using the full graviton amplitude, and
discuss the impact of additional constrains arising from other datasets, such
as Mono-Jet.
| [
{
"created": "Mon, 1 Feb 2016 13:32:48 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2016 15:57:04 GMT",
"version": "v2"
}
] | 2016-02-08 | [
[
"Busoni",
"Giorgio",
""
]
] | I extract new limits on the coefficient of the effective operator generated by tree-level graviton exchange in large extra dimensions from $pp \rightarrow jj$ angular distributions at LHC: $M_T > 6.8$ TeV (CMS after $2.6 fb^{-1}$ of integrated luminosity) and $M_T > 8.3$ TeV (ATLAS after $3.6 fb^{-1}$). I also compare such limits to the ones obtained using the full graviton amplitude, and discuss the impact of additional constrains arising from other datasets, such as Mono-Jet. |
hep-ph/9610389 | null | I. Gogoladze and A. Kobakhidze | Natural suppression of d=5 operator induced proton decay in
supersymmetric grand unified theories | 5 pages, latex, 3 latex figures included | Phys.Atom.Nucl. 60 (1997) 126-129; Yad.Fiz. 60N1 (1997) 136-139 | null | IPGAS-HEP-TH/43/95 | hep-ph | null | The proton decay in supersymmetric (SUSY) Grand Unified Theories (GUTs),
where the special mechanism provides the natural suppression of the dimension 5
($d=5$) operators, was studied. Due to this mechanism, $d=5$ operator induced
proton decay takes place only through the mixing of light generation fermions
with those from third generation and crucially depends on the structure of
fermion mass matrices. We show that in general proton decay is strongly
suppressed relative to the standard SUSY GUT situation and for wide class of
fermion mass matrices the SUSY parameter space practically has no restrictions.
| [
{
"created": "Thu, 17 Oct 1996 19:03:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gogoladze",
"I.",
""
],
[
"Kobakhidze",
"A.",
""
]
] | The proton decay in supersymmetric (SUSY) Grand Unified Theories (GUTs), where the special mechanism provides the natural suppression of the dimension 5 ($d=5$) operators, was studied. Due to this mechanism, $d=5$ operator induced proton decay takes place only through the mixing of light generation fermions with those from third generation and crucially depends on the structure of fermion mass matrices. We show that in general proton decay is strongly suppressed relative to the standard SUSY GUT situation and for wide class of fermion mass matrices the SUSY parameter space practically has no restrictions. |
0809.1499 | Yukinao Akamatsu | Yukinao Akamatsu, Tetsuo Hatsuda, and Tetsufumi Hirano | Heavy Quark Diffusion with Relativistic Langevin Dynamics in the
Quark-Gluon Fluid | 13 pages, 10 figures | Phys.Rev.C79:054907,2009 | 10.1103/PhysRevC.79.054907 | TKYNT-08-14 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic diffusion process of heavy quarks is formulated on the basis
of the relativistic Langevin equation in It\^{o} discretization scheme. The
drag force inside the quark-gluon plasma (QGP) is parametrized according to the
formula for the strongly coupled plasma obtained by the AdS/CFT correspondence.
The diffusion dynamics of charm and bottom quarks in QGP is described by
combining the Langevin simulation under the background matter described by the
relativistic hydrodynamics. Theoretical calculations of the nuclear
modification factor R_{AA} and the elliptic flow v_{2} for the single electrons
from the charm and bottom decays are compared with the experimental data from
the relativistic heavy ion collisions. The R_{AA} for electrons with large
transverse momentum (p_{T} > 3 GeV) indicates that the drag force from the QGP
is as strong as the AdS/CFT prediction.
| [
{
"created": "Tue, 9 Sep 2008 07:15:02 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2008 08:16:02 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Sep 2008 08:04:29 GMT",
"version": "v3"
}
] | 2009-08-03 | [
[
"Akamatsu",
"Yukinao",
""
],
[
"Hatsuda",
"Tetsuo",
""
],
[
"Hirano",
"Tetsufumi",
""
]
] | The relativistic diffusion process of heavy quarks is formulated on the basis of the relativistic Langevin equation in It\^{o} discretization scheme. The drag force inside the quark-gluon plasma (QGP) is parametrized according to the formula for the strongly coupled plasma obtained by the AdS/CFT correspondence. The diffusion dynamics of charm and bottom quarks in QGP is described by combining the Langevin simulation under the background matter described by the relativistic hydrodynamics. Theoretical calculations of the nuclear modification factor R_{AA} and the elliptic flow v_{2} for the single electrons from the charm and bottom decays are compared with the experimental data from the relativistic heavy ion collisions. The R_{AA} for electrons with large transverse momentum (p_{T} > 3 GeV) indicates that the drag force from the QGP is as strong as the AdS/CFT prediction. |
1605.00344 | Cheng-Hsien Li | Cheng-Hsien Li and Yong-Zhong Qian | Do Neutrino Wave Functions Overlap and Does it Matter? | Poster presented at NuPhys2015 (London, 16-18 December 2015). 4
pages, LaTeX, 1 jpg and 2 pdf figures | null | null | NuPhys2015-Li | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studies of neutrinos commonly ignore anti-symmetrization of their wave
functions. This implicitly assumes that either spatial wave functions for
neutrinos with approximately the same momentum do not overlap or their
overlapping has no measurable consequences. We examine these assumptions by
considering the evolution of three-dimensional neutrino wave packets (WPs). We
find that it is perfectly adequate to treat accelerator and reactor neutrinos
as separate WPs for typical experimental setup. While solar and supernova
neutrinos correspond to overlapping WPs, they can be treated effectively as
non-overlapping for analyses of their detection.
| [
{
"created": "Mon, 2 May 2016 03:53:22 GMT",
"version": "v1"
}
] | 2016-05-03 | [
[
"Li",
"Cheng-Hsien",
""
],
[
"Qian",
"Yong-Zhong",
""
]
] | Studies of neutrinos commonly ignore anti-symmetrization of their wave functions. This implicitly assumes that either spatial wave functions for neutrinos with approximately the same momentum do not overlap or their overlapping has no measurable consequences. We examine these assumptions by considering the evolution of three-dimensional neutrino wave packets (WPs). We find that it is perfectly adequate to treat accelerator and reactor neutrinos as separate WPs for typical experimental setup. While solar and supernova neutrinos correspond to overlapping WPs, they can be treated effectively as non-overlapping for analyses of their detection. |
hep-ph/0111293 | Randy Kobes | M. E. Carrington, T. J. Hammond, R. Kobes | Infrared behaviour of the pressure in g\phi^3 theory in 6 dimensions | 6 pages, 4 figures, uses revtex4 | Phys.Rev. D65 (2002) 067703 | 10.1103/PhysRevD.65.067703 | null | hep-ph | null | In an earlier paper Almeida and Frenkel considered the calculation of the
pressure in g\phi^3 theory in 6 dimensions via the Schwinger--Dyson equation.
They found, under certain approximations, that a finite result ensues in the
infrared limit. We find this conclusion to remain true with certain variations
of these approximations, suggesting the finiteness of the result to be fairly
robust.
| [
{
"created": "Thu, 22 Nov 2001 21:04:47 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Carrington",
"M. E.",
""
],
[
"Hammond",
"T. J.",
""
],
[
"Kobes",
"R.",
""
]
] | In an earlier paper Almeida and Frenkel considered the calculation of the pressure in g\phi^3 theory in 6 dimensions via the Schwinger--Dyson equation. They found, under certain approximations, that a finite result ensues in the infrared limit. We find this conclusion to remain true with certain variations of these approximations, suggesting the finiteness of the result to be fairly robust. |
hep-ph/0210120 | Jaume Guasch | Jaume Guasch, Wolfgang Hollik, Joan Sola | Full one-loop corrections to sfermion decays | LaTeX, 8 pages, 4 figures, 1 table. Talk presented at the 10th
International Conference on Supersymmetry and Unification of Fundamental
Interactions (SUSY 02), DESY, Hamburg, Germany, 17-23 June 2002, to appear in
the proceedings | null | null | PSI-PR-02-12, UB-ECM-PF-02-21 | hep-ph | null | We analyze the partial decay widths of sfermions decaying into charginos and
neutralinos \Gamma(\sfermion -> f'\chi) at the one-loop level. We present the
renormalization framework, and discuss the value of the corrections for top-
and bottom-squark decays.
| [
{
"created": "Tue, 8 Oct 2002 09:32:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guasch",
"Jaume",
""
],
[
"Hollik",
"Wolfgang",
""
],
[
"Sola",
"Joan",
""
]
] | We analyze the partial decay widths of sfermions decaying into charginos and neutralinos \Gamma(\sfermion -> f'\chi) at the one-loop level. We present the renormalization framework, and discuss the value of the corrections for top- and bottom-squark decays. |
1812.09845 | YuDong Wang | Yu-Dong Wang and Jian-Xiong Wang | Angular distribution coefficients of Z(W) boson produced in $e^+e^-$
collisions at $\sqrt{s}=240$ GeV | 7 pages,9 figures | null | 10.1088/1674-1137/43/4/043102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At designed CEPC, similar to hadron collider, the angular distribution
coefficients of decay lepton pair from produced Z(W) boson in $e^+ e^-$
collisions are predicted. Their dependence on $cos\theta_Z$($cos\theta_W$) are
presented in four different polarization frame. Furthermore, the value of
angular coefficients in different bins of $cos\theta_Z$ are presented in the
C-S frame. In comparison to the case at hadron collider, better accurate
measurement for $Z(W)$ is expected since there exists less background and $W$
could be reconstructed from it's leptonic decay channel. This work supply a way
to precise test the electroweak production mechanism or some effect induced
from new physics in the future measurements at the CEPC.
| [
{
"created": "Mon, 24 Dec 2018 06:57:11 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Wang",
"Yu-Dong",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] | At designed CEPC, similar to hadron collider, the angular distribution coefficients of decay lepton pair from produced Z(W) boson in $e^+ e^-$ collisions are predicted. Their dependence on $cos\theta_Z$($cos\theta_W$) are presented in four different polarization frame. Furthermore, the value of angular coefficients in different bins of $cos\theta_Z$ are presented in the C-S frame. In comparison to the case at hadron collider, better accurate measurement for $Z(W)$ is expected since there exists less background and $W$ could be reconstructed from it's leptonic decay channel. This work supply a way to precise test the electroweak production mechanism or some effect induced from new physics in the future measurements at the CEPC. |
hep-ph/9710233 | Marco Aurelio Diaz | Marco Aurelio Diaz | Charged Higgs Sector with and without R--Parity | 11 pages including 6 figures, Latex. Presented at the Third Warsaw
Workshop "Physics from Planck Scale to Electroweak Scale", Warsaw University,
2-5 April 1997, Warsaw, Poland | null | null | FTUV/97-56, IFIC/97-72 | hep-ph | null | The simplest way of studying systematically R-parity violating phenomena is
by introducing a bilinear term in the superpotential of the type $\epsilon\hat
L\hat H_2$, which violates R-parity and lepton number but keep barion number
conserved. In its simplest version, this ``$\epsilon$--model'' is a two
parameter extension of the MSSM and a one parameter extension of the
MSSM--SUGRA. Here we study the charged Higgs sector of the model, which mixes
with the stau sector, and compare it with the charged Higgs sector of the MSSM.
We demonstrate that $m_{H^{\pm}}$ can be lower than $m_W$ already at tree
level, and calculate the production cross section of pairs of charged Higgs and
staus. In this model it is possible the mixed production of a charged Higgs and
a stau and its production cross section can be sizable. We finally comment
about the new R-parity violating decay modes of the charged scalars.
| [
{
"created": "Fri, 3 Oct 1997 11:53:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diaz",
"Marco Aurelio",
""
]
] | The simplest way of studying systematically R-parity violating phenomena is by introducing a bilinear term in the superpotential of the type $\epsilon\hat L\hat H_2$, which violates R-parity and lepton number but keep barion number conserved. In its simplest version, this ``$\epsilon$--model'' is a two parameter extension of the MSSM and a one parameter extension of the MSSM--SUGRA. Here we study the charged Higgs sector of the model, which mixes with the stau sector, and compare it with the charged Higgs sector of the MSSM. We demonstrate that $m_{H^{\pm}}$ can be lower than $m_W$ already at tree level, and calculate the production cross section of pairs of charged Higgs and staus. In this model it is possible the mixed production of a charged Higgs and a stau and its production cross section can be sizable. We finally comment about the new R-parity violating decay modes of the charged scalars. |
1606.08388 | Christian Weiss | P. Schweitzer, C. Weiss | Spin-flavor structure of chiral-odd GPDs in the large-N_c limit | 13 pages, 1 figure | Phys. Rev. C 94, 045202 (2016) | 10.1103/PhysRevC.94.045202 | JLAB-THY-16-2278 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spin-flavor structure of the nucleon's chiral-odd generalized
parton distributions (transversity GPDs) in the large-N_c limit of QCD. In
contrast to the chiral-even case, only three combinations of the four
chiral-odd GPDs are non-zero in the leading order of the 1/N_c expansion:
E_T-bar = E_T + 2 H_T-tilde, H_T and E_T-tilde. The degeneracy is explained by
the absence of spin-orbit interactions correlating the transverse momentum
transfer with the transverse quark spin. It can also be deduced from the
natural N_c-scaling of the quark-nucleon helicity amplitudes associated with
the GPDs. In the GPD E_T-bar the flavor-singlet component u + d is leading in
the 1/N_c expansion, while in H_T and E_T-tilde it is the flavor-nonsinglet
components u - d. The large-N_c relations are consistent with the spin-flavor
structure extracted from hard exclusive pi0 and eta electroproduction data, if
it is assumed that the processes are mediated by twist-3 amplitudes involving
the chiral-odd GPDs and the chiral-odd pseudoscalar meson distribution
amplitudes.
| [
{
"created": "Mon, 27 Jun 2016 18:06:27 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Schweitzer",
"P.",
""
],
[
"Weiss",
"C.",
""
]
] | We study the spin-flavor structure of the nucleon's chiral-odd generalized parton distributions (transversity GPDs) in the large-N_c limit of QCD. In contrast to the chiral-even case, only three combinations of the four chiral-odd GPDs are non-zero in the leading order of the 1/N_c expansion: E_T-bar = E_T + 2 H_T-tilde, H_T and E_T-tilde. The degeneracy is explained by the absence of spin-orbit interactions correlating the transverse momentum transfer with the transverse quark spin. It can also be deduced from the natural N_c-scaling of the quark-nucleon helicity amplitudes associated with the GPDs. In the GPD E_T-bar the flavor-singlet component u + d is leading in the 1/N_c expansion, while in H_T and E_T-tilde it is the flavor-nonsinglet components u - d. The large-N_c relations are consistent with the spin-flavor structure extracted from hard exclusive pi0 and eta electroproduction data, if it is assumed that the processes are mediated by twist-3 amplitudes involving the chiral-odd GPDs and the chiral-odd pseudoscalar meson distribution amplitudes. |
1109.0199 | Helios Sanchis-Alepuz | Helios Sanchis-Alepuz, Gernot Eichmann, Selym Villalba-Chavez and
Reinhard Alkofer | Delta and Omega masses in a three-quark covariant Faddeev approach | 9 pages, 4 figures, 3 tables | Phys.Rev.D84:096003,2011 | 10.1103/PhysRevD.84.096003 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the solution of the Poincare-covariant Faddeev equation for the
Delta(1232) and Omega(1672) baryons. The covariant structure of the
corresponding baryon amplitudes and their decomposition in terms of internal
spin and orbital angular momentum is explicitly derived. The interaction kernel
is truncated to a rainbow-ladder dressed-gluon exchange such that chiral
symmetry and its dynamical breaking are correctly implemented. The resulting
physical masses agree reasonably with experiment and their evolution with the
pion mass compares favorably with lattice calculations. Evidence for the
non-sphericity of the Delta-resonance is discussed as well.
| [
{
"created": "Thu, 1 Sep 2011 14:50:15 GMT",
"version": "v1"
}
] | 2011-11-09 | [
[
"Sanchis-Alepuz",
"Helios",
""
],
[
"Eichmann",
"Gernot",
""
],
[
"Villalba-Chavez",
"Selym",
""
],
[
"Alkofer",
"Reinhard",
""
]
] | We present the solution of the Poincare-covariant Faddeev equation for the Delta(1232) and Omega(1672) baryons. The covariant structure of the corresponding baryon amplitudes and their decomposition in terms of internal spin and orbital angular momentum is explicitly derived. The interaction kernel is truncated to a rainbow-ladder dressed-gluon exchange such that chiral symmetry and its dynamical breaking are correctly implemented. The resulting physical masses agree reasonably with experiment and their evolution with the pion mass compares favorably with lattice calculations. Evidence for the non-sphericity of the Delta-resonance is discussed as well. |
hep-ph/0107184 | Ruo Peng Wang | Ruo Peng Wang | Varieties of Dirac equation and flavors of leptons and quarks | 5 pages, RevTeX | null | null | null | hep-ph | null | I show that there exist twelve independent Dirac equations for spin 1/2
fermions. The Dirac fields that satisfy these equations can be grouped into six
pairs according to the way they transform under continuous space-time
transformations. These six pairs of Dirac equations correspond to the three
quark generations and the three lepton generations. The charged V-A currents
can be formed only from fields of the same pair. This property of the Dirac
fields implies that a quark or lepton may be transformed only into its partner
of the same generation via the charged-current weak interaction. According to
the properties of the charged-current weak interaction, I conclude that
different elementary fermion fields must satisfy different Dirac equations, and
there may not be more than twelve flavors of elementary fermions that are
already known.
| [
{
"created": "Tue, 17 Jul 2001 03:27:21 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jul 2001 06:44:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Wang",
"Ruo Peng",
""
]
] | I show that there exist twelve independent Dirac equations for spin 1/2 fermions. The Dirac fields that satisfy these equations can be grouped into six pairs according to the way they transform under continuous space-time transformations. These six pairs of Dirac equations correspond to the three quark generations and the three lepton generations. The charged V-A currents can be formed only from fields of the same pair. This property of the Dirac fields implies that a quark or lepton may be transformed only into its partner of the same generation via the charged-current weak interaction. According to the properties of the charged-current weak interaction, I conclude that different elementary fermion fields must satisfy different Dirac equations, and there may not be more than twelve flavors of elementary fermions that are already known. |
1509.01536 | Helmut Haberzettl | Helmut Haberzettl, Xiao-Yun Wang, and Jun He | Preserving Local Gauge Invariance with t-Channel Regge Exchange | 11 pages, 2 figures, RevTeX4-1 | Phys. Rev. C 92, 055503 (2015) | 10.1103/PhysRevC.92.055503 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering single-meson photo- and electroproduction off a baryon, it is
shown how to restore local gauge invariance that was broken by replacing
standard Feynman-type meson exchange in the t-channel by exchange of a Regge
trajectory. This is achieved by constructing a contact current whose
four-divergence cancels the gauge-invariance-violating contributions resulting
from all states above the base state on the Regge trajectory. To illustrate the
procedure, modifications necessary for the process $\gamma +p \to K^+ +
\Sigma^{*0}$ are discussed in some detail. We also provide the general
expression for the contact current for an arbitrary reaction.
| [
{
"created": "Fri, 4 Sep 2015 17:37:01 GMT",
"version": "v1"
}
] | 2015-11-16 | [
[
"Haberzettl",
"Helmut",
""
],
[
"Wang",
"Xiao-Yun",
""
],
[
"He",
"Jun",
""
]
] | Considering single-meson photo- and electroproduction off a baryon, it is shown how to restore local gauge invariance that was broken by replacing standard Feynman-type meson exchange in the t-channel by exchange of a Regge trajectory. This is achieved by constructing a contact current whose four-divergence cancels the gauge-invariance-violating contributions resulting from all states above the base state on the Regge trajectory. To illustrate the procedure, modifications necessary for the process $\gamma +p \to K^+ + \Sigma^{*0}$ are discussed in some detail. We also provide the general expression for the contact current for an arbitrary reaction. |
1406.3349 | Chien-Yi Chen | Chien-Yi Chen, S. Dawson, I. M. Lewis | Top Partners and Higgs Boson Production | 37 pages, 11 figures. Minor changes to Figs. 8-11 | Phys. Rev. D 90, 035016 (2014) | 10.1103/PhysRevD.90.035016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs boson is produced at the LHC through gluon fusion at roughly the
Standard Model rate. New colored fermions, which can contribute to
$gg\rightarrow h$, must have vector-like interactions in order not to be in
conflict with the experimentally measured rate. We examine the size of the
corrections to single and double Higgs production from heavy vector-like
fermions in $SU(2)_L$ singlets and doublets and search for regions of parameter
space where double Higgs production is enhanced relative to the Standard Model
prediction. We compare production rates and distributions for double Higgs
production from gluon fusion using an exact calculation, the low energy theorem
(LET), where the top quark and the heavy vector-like fermions are taken to be
infinitely massive, and an effective theory (EFT) where top mass effects are
included exactly and the effects of the heavy fermions are included to ${\cal
O}(1/M^2_X)$. Unlike the LET, the EFT gives an extremely accurate description
of the kinematic distributions for double Higgs production.
| [
{
"created": "Thu, 12 Jun 2014 20:00:16 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Aug 2014 21:53:35 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Nov 2014 21:00:00 GMT",
"version": "v3"
}
] | 2014-11-06 | [
[
"Chen",
"Chien-Yi",
""
],
[
"Dawson",
"S.",
""
],
[
"Lewis",
"I. M.",
""
]
] | The Higgs boson is produced at the LHC through gluon fusion at roughly the Standard Model rate. New colored fermions, which can contribute to $gg\rightarrow h$, must have vector-like interactions in order not to be in conflict with the experimentally measured rate. We examine the size of the corrections to single and double Higgs production from heavy vector-like fermions in $SU(2)_L$ singlets and doublets and search for regions of parameter space where double Higgs production is enhanced relative to the Standard Model prediction. We compare production rates and distributions for double Higgs production from gluon fusion using an exact calculation, the low energy theorem (LET), where the top quark and the heavy vector-like fermions are taken to be infinitely massive, and an effective theory (EFT) where top mass effects are included exactly and the effects of the heavy fermions are included to ${\cal O}(1/M^2_X)$. Unlike the LET, the EFT gives an extremely accurate description of the kinematic distributions for double Higgs production. |
1002.2471 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the ${3\over 2}^+$ heavy and doubly heavy baryon states with
QCD sum rules | 19 pages, 34 figures, revised version | Eur.Phys.J.C68:459-472,2010 | 10.1140/epjc/s10052-010-1357-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the ${3\over 2}^+$ heavy and doubly heavy baryon
states $\Xi^*_{cc}$, $\Omega^*_{cc}$, $\Xi^*_{bb}$, $\Omega^*_{bb}$,
$\Sigma_c^*$, $\Xi_c^*$, $\Omega_c^*$, $\Sigma_b^*$, $\Xi_b^*$ and
$\Omega_b^*$ by subtracting the contributions from the corresponding ${3\over
2}^-$ heavy and doubly heavy baryon states with the QCD sum rules, and make
reasonable predictions for their masses.
| [
{
"created": "Fri, 12 Feb 2010 03:42:52 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Apr 2010 08:59:55 GMT",
"version": "v2"
}
] | 2010-08-09 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we study the ${3\over 2}^+$ heavy and doubly heavy baryon states $\Xi^*_{cc}$, $\Omega^*_{cc}$, $\Xi^*_{bb}$, $\Omega^*_{bb}$, $\Sigma_c^*$, $\Xi_c^*$, $\Omega_c^*$, $\Sigma_b^*$, $\Xi_b^*$ and $\Omega_b^*$ by subtracting the contributions from the corresponding ${3\over 2}^-$ heavy and doubly heavy baryon states with the QCD sum rules, and make reasonable predictions for their masses. |
0910.4492 | Igor Ivanov | A. Degee and I. P. Ivanov | Higgs masses of the general 2HDM in the Minkowski-space formalism | 14 pages, no figures; v2: reference added, misprints corrected | Phys.Rev.D81:015012,2010 | 10.1103/PhysRevD.81.015012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the masses of the Higgs bosons in the most general two-Higgs-doublet
model in a basis-independent approach. We adapt the recently developed
Minkowski-space formalism to this problem and calculate traces of any power of
the mass-matrix in a compact and reparametrization-invariant form. Our results
can be used to gain insight into the dynamics of the scalar sector of the
general 2HDM.
| [
{
"created": "Fri, 23 Oct 2009 12:20:22 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2009 13:50:55 GMT",
"version": "v2"
}
] | 2010-03-16 | [
[
"Degee",
"A.",
""
],
[
"Ivanov",
"I. P.",
""
]
] | We study the masses of the Higgs bosons in the most general two-Higgs-doublet model in a basis-independent approach. We adapt the recently developed Minkowski-space formalism to this problem and calculate traces of any power of the mass-matrix in a compact and reparametrization-invariant form. Our results can be used to gain insight into the dynamics of the scalar sector of the general 2HDM. |
hep-ph/0404258 | C. Anastasiou | C. Anastasiou, A. Lazopoulos | Automatic Integral Reduction for Higher Order Perturbative Calculations | 23 pages | JHEP 0407 (2004) 046 | 10.1088/1126-6708/2004/07/046 | null | hep-ph | null | We present a program for the reduction of large systems of integrals to
master integrals. The algorithm was first proposed by Laporta; in this paper,
we implement it in MAPLE. We also develop two new features which keep the size
of intermediate expressions relatively small throughout the calculation. The
program requires modest input information from the user and can be used for
generic calculations in perturbation theory.
| [
{
"created": "Wed, 28 Apr 2004 19:07:25 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2004 12:14:48 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Anastasiou",
"C.",
""
],
[
"Lazopoulos",
"A.",
""
]
] | We present a program for the reduction of large systems of integrals to master integrals. The algorithm was first proposed by Laporta; in this paper, we implement it in MAPLE. We also develop two new features which keep the size of intermediate expressions relatively small throughout the calculation. The program requires modest input information from the user and can be used for generic calculations in perturbation theory. |
hep-ph/0008321 | Ulrich Nierste | Ulrich Nierste and Tilman Plehn | Probing Light Sbottoms with B Decays | 10 pages, 2 figures | Phys.Lett. B493 (2000) 104-112 | 10.1016/S0370-2693(00)01122-9 | FERMILAB-Pub-00/211-T, MAD--PH--00--1190 | hep-ph | null | We discuss recently reported experimental hints for a bottom squark with mass
around 3.5 GeV decaying as sbottom -> charm + lepton + anti-sneutrino. We
correlate the sbottom lifetime with the decay rates for bottom -> sbottom +
neutrino + anti-sneutrino and bottom -> sbottom + anti-neutrino + sneutrino in
the framework of a minimal supersymmetric model extended by right-handed
(s)neutrinos. Confronting our results with the well-measured semileptonic
branching ratio of B mesons we conclude that the light sbottom interpretation
of the experimental anomalies is ruled out, unless m_bottom < m_sbottom +
m_sneutrino.
| [
{
"created": "Wed, 30 Aug 2000 22:18:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Nierste",
"Ulrich",
""
],
[
"Plehn",
"Tilman",
""
]
] | We discuss recently reported experimental hints for a bottom squark with mass around 3.5 GeV decaying as sbottom -> charm + lepton + anti-sneutrino. We correlate the sbottom lifetime with the decay rates for bottom -> sbottom + neutrino + anti-sneutrino and bottom -> sbottom + anti-neutrino + sneutrino in the framework of a minimal supersymmetric model extended by right-handed (s)neutrinos. Confronting our results with the well-measured semileptonic branching ratio of B mesons we conclude that the light sbottom interpretation of the experimental anomalies is ruled out, unless m_bottom < m_sbottom + m_sneutrino. |
1512.07904 | Keisuke Harigaya | Lawrence J. Hall, Keisuke Harigaya, and Yasunori Nomura | 750 GeV Diphotons: Implications for Supersymmetric Unification | 10 pages, 6 figures; to appear in JHEP | null | 10.1007/JHEP03(2016)017 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent signal of 750 GeV diphotons at the LHC can be explained within the
framework of supersymmetric unification by the introduction of vector quarks
and leptons with Yukawa couplings to a singlet S that describes the 750 GeV
resonance. We study the most general set of theories that allow successful
gauge coupling unification, and find that these Yukawa couplings are severely
constrained by renormalization group behavior: they are independent of
ultraviolet physics and flow to values at the TeV scale that we calculate
precisely. As a consequence the vector quarks and leptons must be light;
typically in the region of 375 GeV to 700 GeV, and in certain cases up to 1
TeV. The 750 GeV resonance may have a width less than the experimental
resolution; alternatively, with the mass splitting between scalar and
pseudoscalar components of S arising from one-loop diagrams involving vector
fermions, we compute an apparent width of 10s of GeV.
| [
{
"created": "Thu, 24 Dec 2015 20:47:17 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Dec 2015 20:30:06 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Mar 2016 01:42:23 GMT",
"version": "v3"
}
] | 2016-03-23 | [
[
"Hall",
"Lawrence J.",
""
],
[
"Harigaya",
"Keisuke",
""
],
[
"Nomura",
"Yasunori",
""
]
] | A recent signal of 750 GeV diphotons at the LHC can be explained within the framework of supersymmetric unification by the introduction of vector quarks and leptons with Yukawa couplings to a singlet S that describes the 750 GeV resonance. We study the most general set of theories that allow successful gauge coupling unification, and find that these Yukawa couplings are severely constrained by renormalization group behavior: they are independent of ultraviolet physics and flow to values at the TeV scale that we calculate precisely. As a consequence the vector quarks and leptons must be light; typically in the region of 375 GeV to 700 GeV, and in certain cases up to 1 TeV. The 750 GeV resonance may have a width less than the experimental resolution; alternatively, with the mass splitting between scalar and pseudoscalar components of S arising from one-loop diagrams involving vector fermions, we compute an apparent width of 10s of GeV. |
2302.08513 | Peter Denton | Peter B. Denton and Julia Gehrlein | Here Comes the Sun: Solar Parameters in Long-Baseline Accelerator
Neutrino Oscillations | 29 pages, 13 figures, comments welcome! v2: matches published version | JHEP 06 (2023) 090 | 10.1007/JHEP06(2023)090 | CERN-TH-2023-015 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Long-baseline (LBL) accelerator neutrino oscillation experiments, such as
NOvA and T2K in the current generation, and DUNE-LBL and HK-LBL in the coming
years, will measure the remaining unknown oscillation parameters with excellent
precision. These analyses assume external input on the so-called ``solar
parameters,'' $\theta_{12}$ and $\Delta m^2_{21}$, from solar experiments such
as SNO, SK, and Borexino, as well as reactor experiments like KamLAND. Here we
investigate their role in long-baseline experiments. We show that, without
external input on $\Delta m^2_{21}$ and $\theta_{12}$, the sensitivity to
detecting and quantifying CP violation is significantly, but not entirely,
reduced. Thus long-baseline accelerator experiments can actually determine
$\Delta m^2_{21}$ and $\theta_{12}$, and thus all six oscillation parameters,
without input from \emph{any} other oscillation experiment. In particular,
$\Delta m^2_{21}$ can be determined; thus DUNE-LBL and HK-LBL can measure both
the solar and atmospheric mass splittings in their long-baseline analyses
alone. While their sensitivities are not competitive with existing constraints,
they are very orthogonal probes of solar parameters and provide a key
consistency check of a less probed sector of the three-flavor oscillation
picture. Furthermore, we also show that the true values of $\Delta m^2_{21}$
and $\theta_{12}$ play an important role in the sensitivity of other
oscillation parameters such as the CP violating phase $\delta$.
| [
{
"created": "Thu, 16 Feb 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Jun 2023 14:07:08 GMT",
"version": "v2"
}
] | 2023-06-21 | [
[
"Denton",
"Peter B.",
""
],
[
"Gehrlein",
"Julia",
""
]
] | Long-baseline (LBL) accelerator neutrino oscillation experiments, such as NOvA and T2K in the current generation, and DUNE-LBL and HK-LBL in the coming years, will measure the remaining unknown oscillation parameters with excellent precision. These analyses assume external input on the so-called ``solar parameters,'' $\theta_{12}$ and $\Delta m^2_{21}$, from solar experiments such as SNO, SK, and Borexino, as well as reactor experiments like KamLAND. Here we investigate their role in long-baseline experiments. We show that, without external input on $\Delta m^2_{21}$ and $\theta_{12}$, the sensitivity to detecting and quantifying CP violation is significantly, but not entirely, reduced. Thus long-baseline accelerator experiments can actually determine $\Delta m^2_{21}$ and $\theta_{12}$, and thus all six oscillation parameters, without input from \emph{any} other oscillation experiment. In particular, $\Delta m^2_{21}$ can be determined; thus DUNE-LBL and HK-LBL can measure both the solar and atmospheric mass splittings in their long-baseline analyses alone. While their sensitivities are not competitive with existing constraints, they are very orthogonal probes of solar parameters and provide a key consistency check of a less probed sector of the three-flavor oscillation picture. Furthermore, we also show that the true values of $\Delta m^2_{21}$ and $\theta_{12}$ play an important role in the sensitivity of other oscillation parameters such as the CP violating phase $\delta$. |
hep-ph/0501279 | Chong Sheng Li | Li Gang Jin, Chong Sheng Li, Qiang Li, Jian Jun Liu, and Robert J.
Oakes | Next-to-leading order QCD predictions for pair production of neutral
Higgs bosons at the CERN Large Hadron Collider | 43 pages, 16 figures, minor changes, some references added, a version
to appear in PRD | Phys.Rev. D71 (2005) 095004 | 10.1103/PhysRevD.71.095004 | null | hep-ph | null | We present the calculations of the complete NLO inclusive total cross
sections for pair production of neutral Higgs bosons through $b\bar b$
annihilation in the minimal supersymmetric standard model at the CERN Large
Hadron Collider. In our calculations, we used both the DREG scheme and the DRED
scheme and found that the NLO total cross sections in the above two schemes are
the same. Our results show that the $b\bar b$-annihilation contributions can
exceed ones of $gg$ fusion and $q\bar q$ annihilation for $h^0H^0$, $A^0h^0$
and $A^0H^0$ productions when $\tan\beta$ is large. In the case of $\mu>0$, the
NLO corrections enhance the LO total cross sections significantly, which can
reach a few tens percent, while for $\mu<0$, the corrections are relatively
small, and are negative in most parameter space. Moreover, the NLO QCD
corrections can reduce the dependence of the total cross sections on the
renormalization/factorization scale, especially for $\mu<0$. We also use the
CTEQ6.1 PDF sets to estimate the uncertainty of LO and NLO total cross
sections, and find that the uncertainty arising from the choice of PDFs
increases with the increasing $m_{A^0}$.
| [
{
"created": "Sun, 30 Jan 2005 10:46:13 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Apr 2005 05:00:09 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Jin",
"Li Gang",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Li",
"Qiang",
""
],
[
"Liu",
"Jian Jun",
""
],
[
"Oakes",
"Robert J.",
""
]
] | We present the calculations of the complete NLO inclusive total cross sections for pair production of neutral Higgs bosons through $b\bar b$ annihilation in the minimal supersymmetric standard model at the CERN Large Hadron Collider. In our calculations, we used both the DREG scheme and the DRED scheme and found that the NLO total cross sections in the above two schemes are the same. Our results show that the $b\bar b$-annihilation contributions can exceed ones of $gg$ fusion and $q\bar q$ annihilation for $h^0H^0$, $A^0h^0$ and $A^0H^0$ productions when $\tan\beta$ is large. In the case of $\mu>0$, the NLO corrections enhance the LO total cross sections significantly, which can reach a few tens percent, while for $\mu<0$, the corrections are relatively small, and are negative in most parameter space. Moreover, the NLO QCD corrections can reduce the dependence of the total cross sections on the renormalization/factorization scale, especially for $\mu<0$. We also use the CTEQ6.1 PDF sets to estimate the uncertainty of LO and NLO total cross sections, and find that the uncertainty arising from the choice of PDFs increases with the increasing $m_{A^0}$. |
1710.07408 | Xing-Xing Dong | Xing-Xing Dong, Shu-Min Zhao, Jing-Jing Feng, Guo-Zhu Ning, Jian-Bin
Chen, Hai-Bin Zhang, Tai-Fu Feng | Search for charged lepton flavor violation of vector mesons in BLMSSM
model | null | Phys. Rev. D 97, 056027 (2018) | 10.1103/PhysRevD.97.056027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the charged lepton flavor violating (CLFV) decays of vector mesons
$V\rightarrow l_i^{\pm}l_j^{\mp}$ with $V\in\{\phi, J/\Psi, \Upsilon, \rho^0,
\omega \}$ in BLMSSM model. This new model is introduced as an supersymmetric
extension of Standard Model (SM), where local gauged baryon number B and lepton
number L are considered. The numerical results indicate BLMSSM model can
produce significant contributions to such two-body CLFV decays. And the
branching ratios for these CLFV processes can easily reach the present
experimental upper bounds. Therefore, searching for CLFV processes of vector
mesons may be an effective channels to study new physics.
| [
{
"created": "Fri, 20 Oct 2017 03:51:18 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2017 01:24:29 GMT",
"version": "v2"
}
] | 2018-04-04 | [
[
"Dong",
"Xing-Xing",
""
],
[
"Zhao",
"Shu-Min",
""
],
[
"Feng",
"Jing-Jing",
""
],
[
"Ning",
"Guo-Zhu",
""
],
[
"Chen",
"Jian-Bin",
""
],
[
"Zhang",
"Hai-Bin",
""
],
[
"Feng",
"Tai-Fu",
""
]
] | We analyze the charged lepton flavor violating (CLFV) decays of vector mesons $V\rightarrow l_i^{\pm}l_j^{\mp}$ with $V\in\{\phi, J/\Psi, \Upsilon, \rho^0, \omega \}$ in BLMSSM model. This new model is introduced as an supersymmetric extension of Standard Model (SM), where local gauged baryon number B and lepton number L are considered. The numerical results indicate BLMSSM model can produce significant contributions to such two-body CLFV decays. And the branching ratios for these CLFV processes can easily reach the present experimental upper bounds. Therefore, searching for CLFV processes of vector mesons may be an effective channels to study new physics. |
2302.11980 | Julia Panteleeva | J. Yu. Panteleeva | Internal force distributions in 't Hooft-Polyakov monopole and Julia-Zee
dyon | null | null | 10.1103/PhysRevD.107.055015 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The energy-momentum tensor of the 't Hooft-Polyakov monopole and the
Julia-Zee dyon are studied. This tensor contains important information about
the pressure and the shear force distributions which define the mechanical
properties of systems. Obtaining the violation of the local stability criterion
for the magnetic monopole and dyon we decompose the EMTs into long- and
short-range parts. This decomposition depends on the abelian field strength
tensor which can not be uniquely defined. We suggest to use the modified 't
Hooft definition for the tensor. Finally, the long- and short-range parts of
the EMTs are computed and new equilibrium equations are obtained. Numerical
values for masses, $D$-terms and various mean square radii for the monopole and
the dyon are also computed.
| [
{
"created": "Thu, 23 Feb 2023 12:52:24 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2023 09:48:25 GMT",
"version": "v2"
}
] | 2023-04-12 | [
[
"Panteleeva",
"J. Yu.",
""
]
] | The energy-momentum tensor of the 't Hooft-Polyakov monopole and the Julia-Zee dyon are studied. This tensor contains important information about the pressure and the shear force distributions which define the mechanical properties of systems. Obtaining the violation of the local stability criterion for the magnetic monopole and dyon we decompose the EMTs into long- and short-range parts. This decomposition depends on the abelian field strength tensor which can not be uniquely defined. We suggest to use the modified 't Hooft definition for the tensor. Finally, the long- and short-range parts of the EMTs are computed and new equilibrium equations are obtained. Numerical values for masses, $D$-terms and various mean square radii for the monopole and the dyon are also computed. |
1307.4773 | Hugo Serodio | H. Serodio | Yukawa sector of Multi Higgs Doublet Models in the presence of Abelian
symmetries | Small aesthetic corrections matching the publish version | null | 10.1103/PhysRevD.88.056015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general method for classifying the possible quark models of a
multi-Higgs-doublet model, in the presence of Abelian symmetries, is presented.
All the possible sets of textures that can be present in a given sector are
shown, thus turning the determination of the flavor models into a combinatorial
problem. Several symmetry implementations are studied for two and three Higgs
doublet models. Some models implementations are explored in great detail, with
a particular emphasis on models known as Branco-Grimus-Lavoura and
nearest-neighbour-nnteraction. Several considerations on the flavor changing
neutral currents of multi-Higgs models are also given.
| [
{
"created": "Wed, 17 Jul 2013 20:20:32 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Sep 2013 08:33:47 GMT",
"version": "v2"
}
] | 2013-10-02 | [
[
"Serodio",
"H.",
""
]
] | A general method for classifying the possible quark models of a multi-Higgs-doublet model, in the presence of Abelian symmetries, is presented. All the possible sets of textures that can be present in a given sector are shown, thus turning the determination of the flavor models into a combinatorial problem. Several symmetry implementations are studied for two and three Higgs doublet models. Some models implementations are explored in great detail, with a particular emphasis on models known as Branco-Grimus-Lavoura and nearest-neighbour-nnteraction. Several considerations on the flavor changing neutral currents of multi-Higgs models are also given. |
hep-ph/9907248 | Harald Anlauf | H. Anlauf, A.B. Arbuzov, E.A. Kuraev | QED corrections to DIS with a tagged photon at HERA | 8 pages, LaTeX2e, 3 figures. Contribution to the Workshop on Monte
Carlo Generators for HERA Physics, DESY, 1998/99 | null | null | SI-99-1 | hep-ph | null | We report on the calculation of the QED radiative corrections to deep
inelastic scattering with a tagged photon with next-to-leading logarithmic
accuracy. Numerical results are given for different experimental setups for the
case of the HERA collider.
| [
{
"created": "Tue, 6 Jul 1999 09:57:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anlauf",
"H.",
""
],
[
"Arbuzov",
"A. B.",
""
],
[
"Kuraev",
"E. A.",
""
]
] | We report on the calculation of the QED radiative corrections to deep inelastic scattering with a tagged photon with next-to-leading logarithmic accuracy. Numerical results are given for different experimental setups for the case of the HERA collider. |
hep-ph/9912398 | Talavera | G. Amor\'os (Lund U. & Helsinki U.), J. Bijnens and P. Talavera (Lund
U.) | Low Energy Constants from Kl4 Form-Factors | 6 pages, uses axodraw.sty, 2 figures, bug in program corrected, new
numerical results | Phys.Lett. B480 (2000) 71-76 | 10.1016/S0370-2693(00)00384-1 | LU TP 99-41 | hep-ph | null | We have calculated the form-factors F and G in K ---> pi pi e nu decays (Kl4)
to two-loop order in Chiral Perturbation Theory (ChPT). Combining this together
with earlier two-loop calculations an updated set of values for the L's, the
ChPT constants at p^4, is obtained. We discuss the uncertainties in the
determination and the changes compared to previous estimates.
| [
{
"created": "Fri, 17 Dec 1999 13:06:44 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Feb 2000 12:31:59 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Amorós",
"G.",
"",
"Lund U. & Helsinki U."
],
[
"Bijnens",
"J.",
"",
"Lund\n U."
],
[
"Talavera",
"P.",
"",
"Lund\n U."
]
] | We have calculated the form-factors F and G in K ---> pi pi e nu decays (Kl4) to two-loop order in Chiral Perturbation Theory (ChPT). Combining this together with earlier two-loop calculations an updated set of values for the L's, the ChPT constants at p^4, is obtained. We discuss the uncertainties in the determination and the changes compared to previous estimates. |
hep-ph/9307244 | Elizabeth Jenkins | E. Jenkins | Baryon Hyperfine Mass Splittings in Large N QCD | (10 pages and 4 figures, uses harvmac and uufiles), UCSD/PTH 93-19 | Phys.Lett.B315:441-446,1993 | 10.1016/0370-2693(93)91638-4 | null | hep-ph | null | The hyperfine mass splittings of baryons in large $N$ QCD are proved to be
proportional to ${\bf J}^2$. Hyperfine mass splittings are first allowed at
order $1/N$ in the $1/N$ expansion.
| [
{
"created": "Sun, 11 Jul 1993 03:31:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jenkins",
"E.",
""
]
] | The hyperfine mass splittings of baryons in large $N$ QCD are proved to be proportional to ${\bf J}^2$. Hyperfine mass splittings are first allowed at order $1/N$ in the $1/N$ expansion. |
2201.04639 | Jiang-Hao Yu | Hao-Lin Li, Zhe Ren, Ming-Lei Xiao, Jiang-Hao Yu, Yu-Hui Zheng | Operators For Generic Effective Field Theory at any Dimension: On-shell
Amplitude Basis Construction | 62 pages, 6 tables, with updated references | null | 10.1007/JHEP04(2022)140 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We describe a general procedure to construct the independent and complete
operator bases for generic Lorentz invariant effective field theories, given
any kind of gauge symmetry and field content, up to any mass dimension. By
considering the operator as contact on-shell amplitude, the so-called amplitude
operator correspondence, we provide a unified construction of the Lorentz and
gauge and flavor structures by Young Tableau tensor. Several bases are
constructed to emphasize different aspects: independence (y-basis and m-basis),
repeated fields with flavors (p-basis), and conserved quantum numbers
(j-basis). We also provide new algorithms for finding the m-basis by defining
inner products for group factors and the p-basis by constructing the matrix
representations of the Young symmetrizers from group generators. The on-shell
amplitude basis gives us a systematic way to convert any operator into such
basis, so that the conversions between any other operator bases can be easily
done by linear algebra. All of these are implemented in a Mathematica package:
ABC4EFT (Amplitude Basis Construction for Effective Field Theories).
| [
{
"created": "Wed, 12 Jan 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Feb 2022 02:49:27 GMT",
"version": "v2"
}
] | 2022-05-11 | [
[
"Li",
"Hao-Lin",
""
],
[
"Ren",
"Zhe",
""
],
[
"Xiao",
"Ming-Lei",
""
],
[
"Yu",
"Jiang-Hao",
""
],
[
"Zheng",
"Yu-Hui",
""
]
] | We describe a general procedure to construct the independent and complete operator bases for generic Lorentz invariant effective field theories, given any kind of gauge symmetry and field content, up to any mass dimension. By considering the operator as contact on-shell amplitude, the so-called amplitude operator correspondence, we provide a unified construction of the Lorentz and gauge and flavor structures by Young Tableau tensor. Several bases are constructed to emphasize different aspects: independence (y-basis and m-basis), repeated fields with flavors (p-basis), and conserved quantum numbers (j-basis). We also provide new algorithms for finding the m-basis by defining inner products for group factors and the p-basis by constructing the matrix representations of the Young symmetrizers from group generators. The on-shell amplitude basis gives us a systematic way to convert any operator into such basis, so that the conversions between any other operator bases can be easily done by linear algebra. All of these are implemented in a Mathematica package: ABC4EFT (Amplitude Basis Construction for Effective Field Theories). |
2102.12818 | Mikhail Ivanov | Stefan Groote, Mikhail A. Ivanov, J\"urgen G. K\"orner, Valery E.
Lyubovitskij, Pietro Santorelli, Chien-Thang Tran | Form-factor-independent test of lepton universality in semileptonic
heavy meson and baryon decays | 14 pages, 4 figures, 3 tables. Some discussion and references added.
Will be published in PRD | Phys. Rev. D 103, 093001 (2021) | 10.1103/PhysRevD.103.093001 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In the semileptonic decays of heavy mesons and baryons the lepton-mass
dependence factors out in the quadratic $\cos^2\theta$ coefficient of the
differential $\cos\theta$ distribution. We call the corresponding normalized
coefficient the convexity parameter. This observation opens the path to a test
of lepton universality in semileptonic heavy meson and baryon decays that is
independent of form-factor effects. By projecting out the quadratic rate
coefficient, dividing out the lepton-mass-dependent factor and restricting the
phase space integration to the $\tau$ lepton phase space, one can define
optimized partial rates which, in the Standard Model, are the same for all
three $(e,\mu,\tau)$ modes in a given semileptonic decay process. We discuss
how the identity is spoiled by New Physics effects. We discuss semileptonic
heavy meson decays such as $\bar{B}^0 \to D^{(\ast)+} \ell^- \bar\nu_\ell$ and
$B_c^- \to J/\psi (\eta_c)\ell^- \bar\nu_\ell$, and semileptonic heavy baryon
decays such as $\Lambda_b \to \Lambda_c \ell^- \bar\nu_\ell$ for each
$\ell=e,\mu,\tau$.
| [
{
"created": "Thu, 25 Feb 2021 12:35:27 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Apr 2021 10:17:52 GMT",
"version": "v2"
}
] | 2021-05-19 | [
[
"Groote",
"Stefan",
""
],
[
"Ivanov",
"Mikhail A.",
""
],
[
"Körner",
"Jürgen G.",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Santorelli",
"Pietro",
""
],
[
"Tran",
"Chien-Thang",
""
]
] | In the semileptonic decays of heavy mesons and baryons the lepton-mass dependence factors out in the quadratic $\cos^2\theta$ coefficient of the differential $\cos\theta$ distribution. We call the corresponding normalized coefficient the convexity parameter. This observation opens the path to a test of lepton universality in semileptonic heavy meson and baryon decays that is independent of form-factor effects. By projecting out the quadratic rate coefficient, dividing out the lepton-mass-dependent factor and restricting the phase space integration to the $\tau$ lepton phase space, one can define optimized partial rates which, in the Standard Model, are the same for all three $(e,\mu,\tau)$ modes in a given semileptonic decay process. We discuss how the identity is spoiled by New Physics effects. We discuss semileptonic heavy meson decays such as $\bar{B}^0 \to D^{(\ast)+} \ell^- \bar\nu_\ell$ and $B_c^- \to J/\psi (\eta_c)\ell^- \bar\nu_\ell$, and semileptonic heavy baryon decays such as $\Lambda_b \to \Lambda_c \ell^- \bar\nu_\ell$ for each $\ell=e,\mu,\tau$. |
1409.0687 | Alexander Nesterenko | A.V. Nesterenko | Dispersive approach to QCD: tau lepton hadronic decay in vector and
axial-vector channels | Talk given at 17th International QCD Conference (QCD 14), 30 June - 4
July 2014, Montpellier, France; 4 pages, 1 figure | Nucl. Phys. B (Proc. Suppl.) 258 (2015) 177-180 | 10.1016/j.nuclphysbps.2015.01.038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dispersive approach to QCD, which extends the applicability range of
perturbation theory towards the infrared domain, is developed. This approach
properly accounts for the intrinsically nonperturbative constraints, which
originate in the low-energy kinematic restrictions on pertinent strong
interaction processes. The dispersive approach proves to be capable of
describing OPAL (update 2012) and ALEPH (update 2014) experimental data on
inclusive tau lepton hadronic decay in vector and axial-vector channels in a
self-consistent way.
| [
{
"created": "Tue, 2 Sep 2014 12:50:29 GMT",
"version": "v1"
}
] | 2015-03-10 | [
[
"Nesterenko",
"A. V.",
""
]
] | The dispersive approach to QCD, which extends the applicability range of perturbation theory towards the infrared domain, is developed. This approach properly accounts for the intrinsically nonperturbative constraints, which originate in the low-energy kinematic restrictions on pertinent strong interaction processes. The dispersive approach proves to be capable of describing OPAL (update 2012) and ALEPH (update 2014) experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels in a self-consistent way. |
2212.11843 | Markus Diehl | Markus Diehl, Florian Fabry, Alexey Vladimirov | Two-loop evolution kernels for colour dependent double parton
distributions | 41 pages, 2 figures. v2: corrections (highest order of poles,
polarised valence kernels), added discussion of kinematic limits. v3: added
clarifications, fixed typos | null | 10.1007/JHEP05(2023)067 | DESY-22-206, IPARCOS-UCM-23-026 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | A key ingredient in the description of double parton distributions is their
scale dependence. If the colour of each individual parton is summed over, the
distributions evolve with the same DGLAP kernels as ordinary parton
distributions. This is no longer true if the two partons are colour correlated.
We compute the relevant kernels for this case at next-to-leading order in the
strong coupling, for unpolarised or longitudinally polarised partons and for
transversely polarised quarks.
| [
{
"created": "Thu, 22 Dec 2022 16:25:47 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2023 13:00:01 GMT",
"version": "v2"
},
{
"created": "Mon, 8 May 2023 16:51:15 GMT",
"version": "v3"
}
] | 2023-05-24 | [
[
"Diehl",
"Markus",
""
],
[
"Fabry",
"Florian",
""
],
[
"Vladimirov",
"Alexey",
""
]
] | A key ingredient in the description of double parton distributions is their scale dependence. If the colour of each individual parton is summed over, the distributions evolve with the same DGLAP kernels as ordinary parton distributions. This is no longer true if the two partons are colour correlated. We compute the relevant kernels for this case at next-to-leading order in the strong coupling, for unpolarised or longitudinally polarised partons and for transversely polarised quarks. |
hep-ph/0309330 | Gregory Korchemsky | V.M.Braun, D.Yu.Ivanov, G.P.Korchemsky | The B-Meson Distribution Amplitude in QCD | 17 pages, 8 figures, Latex style | Phys.Rev.D69:034014,2004 | 10.1103/PhysRevD.69.034014 | LPT-Orsay-03-63 | hep-ph | null | The B-meson distribution amplitude is calculated using QCD sum rules. In
particular we obtain an estimate for the integral relevant to exclusive
B-decays \lambda_B = 460 \pm 110 MeV at the scale 1 GeV. A simple QCD-motivated
parametrization of the distribution amplitude is suggested.
| [
{
"created": "Mon, 29 Sep 2003 19:31:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Braun",
"V. M.",
""
],
[
"Ivanov",
"D. Yu.",
""
],
[
"Korchemsky",
"G. P.",
""
]
] | The B-meson distribution amplitude is calculated using QCD sum rules. In particular we obtain an estimate for the integral relevant to exclusive B-decays \lambda_B = 460 \pm 110 MeV at the scale 1 GeV. A simple QCD-motivated parametrization of the distribution amplitude is suggested. |
2010.08271 | Ignasi Rosell | Ignasi Rosell, Antonio Pich, Juan Jos\'e Sanz-Cillero | Constraining resonances by using the electroweak effective theory | 6 pages, 1 figure, 1 table. Talk given at the 40th International
Conference on High Energy Physics - ICHEP2020 (28 July - 6 August, 2020,
virtual meeting, Prague, Czech Republic) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the light of the mass gap between Standard Model (SM) states and possible
new particles, effective field theories are a suitable approach. We take on the
non-linear realization of the electroweak symmetry breaking: the electroweak
effective theory (EWET), also known as Higgs effective field theory (HEFT) or
electroweak chiral Lagrangian (EWChL). At higher scales we consider a resonance
electroweak Lagrangian, coupling SM fields to resonances. Integrating out these
resonances and assuming a well-behaved high-energy behavior, some of the
bosonic low-energy constants are determined or constrained in terms of
resonance masses. Present experimental bounds on these low-energy constants
allow us to push the resonance mass scale to the TeV range, $M_R \geq 2\,$TeV,
in good agreement with previous estimations.
| [
{
"created": "Fri, 16 Oct 2020 09:44:31 GMT",
"version": "v1"
}
] | 2020-10-19 | [
[
"Rosell",
"Ignasi",
""
],
[
"Pich",
"Antonio",
""
],
[
"Sanz-Cillero",
"Juan José",
""
]
] | In the light of the mass gap between Standard Model (SM) states and possible new particles, effective field theories are a suitable approach. We take on the non-linear realization of the electroweak symmetry breaking: the electroweak effective theory (EWET), also known as Higgs effective field theory (HEFT) or electroweak chiral Lagrangian (EWChL). At higher scales we consider a resonance electroweak Lagrangian, coupling SM fields to resonances. Integrating out these resonances and assuming a well-behaved high-energy behavior, some of the bosonic low-energy constants are determined or constrained in terms of resonance masses. Present experimental bounds on these low-energy constants allow us to push the resonance mass scale to the TeV range, $M_R \geq 2\,$TeV, in good agreement with previous estimations. |
hep-ph/9611338 | Jan Bolz | P. Kroll (University of Wuppertal, Germany) | On hard exclusive reactions in the time-like region | Invited talk presented at the Fourth Biennal Conference on Low-Energy
Antiproton Physics, LEAP96, Dinkelsb\"{u}hl (August 1996); 8 pages, LaTeX, 4
PS-figures; uses 'espcrc2.sty' and 'psfig.sty' | Nucl.Phys.Proc.Suppl.56A:33-39,1997 | 10.1016/S0920-5632(97)00249-1 | WU-B 96-38 | hep-ph | null | The proton form factor, two-photon annihilations into $p\bar{p}$ as well as
exclusive charmonium decays are critically examined. It will be argued that the
standard perturbative QCD analysis of these reactions fails, i.e. the need for
additional contributions can convincingly be demonstrated. Possible dynamical
mechanisms such as colour-octet admixtures to the charmonium states or diquarks
inside baryons, will be discussed and compared to the data.
| [
{
"created": "Fri, 15 Nov 1996 11:38:12 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Kroll",
"P.",
"",
"University of Wuppertal, Germany"
]
] | The proton form factor, two-photon annihilations into $p\bar{p}$ as well as exclusive charmonium decays are critically examined. It will be argued that the standard perturbative QCD analysis of these reactions fails, i.e. the need for additional contributions can convincingly be demonstrated. Possible dynamical mechanisms such as colour-octet admixtures to the charmonium states or diquarks inside baryons, will be discussed and compared to the data. |
1711.00858 | Aviv Shalit | Oz Davidi, Rick S. Gupta, Gilad Perez, Diego Redigolo, Aviv Shalit | The Nelson-Barr Relaxion | updated version, 9 pages, 2 figures, phenomenology discussion
extended, conclusions unchanged | Phys. Rev. D 99, 035014 (2019) | 10.1103/PhysRevD.99.035014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological relaxation models in which the relaxion is identified with the
QCD axion, generically fail to account for the smallness of the strong CP
phase. We present a simple alternative solution to this "relaxion CP problem"
based on the Nelson-Barr mechanism. We take CP to be a symmetry of the UV
theory, and the relaxion to have no anomalous coupling with QCD. The non-zero
vacuum expectation value of the relaxion breaks CP spontaneously, and the
resulting phase is mapped to the Cabibbo-Kobayashi-Maskawa phase of the
Standard Model. The extended Nelson-Barr quark sector generates the relaxion
"rolling" potential radiatively, relating the new physics scale with the
relaxion decay constant. With no new states within the reach of the LHC, our
relaxion can still be probed in a variety of astrophysical and cosmological
processes, as well as in flavor experiments.
| [
{
"created": "Thu, 2 Nov 2017 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Mar 2018 12:50:14 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Davidi",
"Oz",
""
],
[
"Gupta",
"Rick S.",
""
],
[
"Perez",
"Gilad",
""
],
[
"Redigolo",
"Diego",
""
],
[
"Shalit",
"Aviv",
""
]
] | Cosmological relaxation models in which the relaxion is identified with the QCD axion, generically fail to account for the smallness of the strong CP phase. We present a simple alternative solution to this "relaxion CP problem" based on the Nelson-Barr mechanism. We take CP to be a symmetry of the UV theory, and the relaxion to have no anomalous coupling with QCD. The non-zero vacuum expectation value of the relaxion breaks CP spontaneously, and the resulting phase is mapped to the Cabibbo-Kobayashi-Maskawa phase of the Standard Model. The extended Nelson-Barr quark sector generates the relaxion "rolling" potential radiatively, relating the new physics scale with the relaxion decay constant. With no new states within the reach of the LHC, our relaxion can still be probed in a variety of astrophysical and cosmological processes, as well as in flavor experiments. |
hep-ph/9701247 | Michael Klasen | M. Klasen and G. Kramer | Jet Shapes in $ep$ and $p\overline{p}$ Collisions in NLO QCD | LaTeX, 18 pages, 12 figures, uses epsfig.sty | Phys. Rev. D 56, 2702 (1997) | 10.1103/PhysRevD.56.2702 | DESY 97-002 | hep-ph | null | We have calculated jet shapes in low $Q^2$ $ep$ and $p\overline{p}$
collisions in perturbation theory at order $\alpha_s^3$ for the hard
parton-parton processes. For the $\gamma p$ process resolved and direct
contributions are superimposed. The dependence of the jet shapes on transverse
energy, rapidity, and inner cone extension is studied. The numerical results of
the calculation are compared with recent data from ZEUS at HERA and from CDF
and D0 at the TEVATRON. Good agreement is achieved if the problem of merging
overlapping jets is taken into account by varying the parameter $R_{sep}$ as a
function of transverse energy and rapidity.
| [
{
"created": "Wed, 8 Jan 1997 17:45:30 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Klasen",
"M.",
""
],
[
"Kramer",
"G.",
""
]
] | We have calculated jet shapes in low $Q^2$ $ep$ and $p\overline{p}$ collisions in perturbation theory at order $\alpha_s^3$ for the hard parton-parton processes. For the $\gamma p$ process resolved and direct contributions are superimposed. The dependence of the jet shapes on transverse energy, rapidity, and inner cone extension is studied. The numerical results of the calculation are compared with recent data from ZEUS at HERA and from CDF and D0 at the TEVATRON. Good agreement is achieved if the problem of merging overlapping jets is taken into account by varying the parameter $R_{sep}$ as a function of transverse energy and rapidity. |
2408.08247 | Raymond Ehlers | R. Ehlers, Y. Chen, J. Mulligan, Y. Ji, A. Kumar, S. Mak, P. M.
Jacobs, A. Majumder, A. Angerami, R. Arora, S. A. Bass, R. Datta, L. Du, H.
Elfner, R. J. Fries, C. Gale, Y. He, B. V. Jacak, S. Jeon, F. Jonas, L.
Kasper, M. Kordell II, R. Kunnawalkam-Elayavalli, J. Latessa, Y.-J. Lee, R.
Lemmon, M. Luzum, A. Mankolli, C. Martin, H. Mehryar, T. Mengel, C. Nattrass,
J. Norman, C. Parker, J.-F. Paquet, J. H. Putschke, H. Roch, G. Roland, B.
Schenke, L. Schwiebert, A. Sengupta, C. Shen, M. Singh, C. Sirimanna, D.
Soeder, R. A. Soltz, I. Soudi, Y. Tachibana, J. Velkovska, G. Vujanovic,
X.-N. Wang, X. Wu, W. Zhao (JETSCAPE Collaboration) | Bayesian Inference analysis of jet quenching using inclusive jet and
hadron suppression measurements | 20 pages, 10 figures, 2 tables, submitted to PRC | null | null | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | The JETSCAPE Collaboration reports a new determination of the jet transport
parameter $\hat{q}$ in the Quark-Gluon Plasma (QGP) using Bayesian Inference,
incorporating all available inclusive hadron and jet yield suppression data
measured in heavy-ion collisions at RHIC and the LHC. This multi-observable
analysis extends the previously published JETSCAPE Bayesian Inference
determination of $\hat{q}$, which was based solely on a selection of inclusive
hadron suppression data. JETSCAPE is a modular framework incorporating detailed
dynamical models of QGP formation and evolution, and jet propagation and
interaction in the QGP. Virtuality-dependent partonic energy loss in the QGP is
modeled as a thermalized weakly-coupled plasma, with parameters determined from
Bayesian calibration using soft-sector observables. This Bayesian calibration
of $\hat{q}$ utilizes Active Learning, a machine--learning approach, for
efficient exploitation of computing resources. The experimental data included
in this analysis span a broad range in collision energy and centrality, and in
transverse momentum. In order to explore the systematic dependence of the
extracted parameter posterior distributions, several different calibrations are
reported, based on combined jet and hadron data; on jet or hadron data
separately; and on restricted kinematic or centrality ranges of the jet and
hadron data. Tension is observed in comparison of these variations, providing
new insights into the physics of jet transport in the QGP and its theoretical
formulation.
| [
{
"created": "Thu, 15 Aug 2024 16:33:07 GMT",
"version": "v1"
}
] | 2024-08-16 | [
[
"Ehlers",
"R.",
"",
"JETSCAPE Collaboration"
],
[
"Chen",
"Y.",
"",
"JETSCAPE Collaboration"
],
[
"Mulligan",
"J.",
"",
"JETSCAPE Collaboration"
],
[
"Ji",
"Y.",
"",
"JETSCAPE Collaboration"
],
[
"Kumar",
"A.",
"",
"JE... | The JETSCAPE Collaboration reports a new determination of the jet transport parameter $\hat{q}$ in the Quark-Gluon Plasma (QGP) using Bayesian Inference, incorporating all available inclusive hadron and jet yield suppression data measured in heavy-ion collisions at RHIC and the LHC. This multi-observable analysis extends the previously published JETSCAPE Bayesian Inference determination of $\hat{q}$, which was based solely on a selection of inclusive hadron suppression data. JETSCAPE is a modular framework incorporating detailed dynamical models of QGP formation and evolution, and jet propagation and interaction in the QGP. Virtuality-dependent partonic energy loss in the QGP is modeled as a thermalized weakly-coupled plasma, with parameters determined from Bayesian calibration using soft-sector observables. This Bayesian calibration of $\hat{q}$ utilizes Active Learning, a machine--learning approach, for efficient exploitation of computing resources. The experimental data included in this analysis span a broad range in collision energy and centrality, and in transverse momentum. In order to explore the systematic dependence of the extracted parameter posterior distributions, several different calibrations are reported, based on combined jet and hadron data; on jet or hadron data separately; and on restricted kinematic or centrality ranges of the jet and hadron data. Tension is observed in comparison of these variations, providing new insights into the physics of jet transport in the QGP and its theoretical formulation. |
1110.0647 | Adam Szczepaniak | Adam P. Szczepaniak | Hadron Spectroscopy | 8 pages, 4 figures. Talk presented at the DPF-2011 Conference,
Providence, RI, August 8-13, 2011 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Advances in experiment, theory and phenomenology of hadron spectroscopy are
discussed. We focus on specific developments in the meson sector.
| [
{
"created": "Tue, 4 Oct 2011 11:49:54 GMT",
"version": "v1"
}
] | 2011-10-05 | [
[
"Szczepaniak",
"Adam P.",
""
]
] | Advances in experiment, theory and phenomenology of hadron spectroscopy are discussed. We focus on specific developments in the meson sector. |
hep-ph/0407100 | Umberto D'Alesio | M. Anselmino (1), M. Boglione (1), U. D'Alesio (2), E. Leader (3), F.
Murgia (2) ((1) University and INFN, Torino, Italy, (2) University and INFN,
Cagliari, Italy, (3) Imperial College, London, UK) | Accessing Sivers gluon distribution via transverse single spin
asymmetries in p(transv. polarized) p --> D X processes at RHIC | RevTeX, 6 pages, 2 ps figures | Phys.Rev. D70 (2004) 074025 | 10.1103/PhysRevD.70.074025 | IC/HEP/04-4 | hep-ph | null | The production of D mesons in the scattering of transversely polarized
protons off unpolarized protons at RHIC offers a clear opportunity to gain
information on the Sivers gluon distribution function. D production at
intermediate rapidity values is dominated by the elementary g g --> c cbar
channel; contributions from q qbar --> c cbar s-channel become important only
at very large values of x_F. In both processes there is no single spin
transfer, so that the final c or cbar quarks are not polarized. Therefore, any
transverse single spin asymmetry observed for D's produced in p(transv.
polarized) p interactions cannot originate from the Collins fragmentation
mechanism, but only from the Sivers effect in the distribution functions. In
particular, any sizeable spin asymmetry measured in p(transv. polarized) p -->
D X at mid-rapidity values will be a direct indication of a non zero Sivers
gluon distribution function. We study the p(transv. polarized) p --> D X
process including intrinsic transverse motion in the parton distribution and
fragmentation functions and in the elementary dynamics, and show how results
from RHIC could allow a measurement of the Sivers gluon distribution function.
| [
{
"created": "Thu, 8 Jul 2004 15:07:19 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Leader",
"E.",
""
],
[
"Murgia",
"F.",
""
]
] | The production of D mesons in the scattering of transversely polarized protons off unpolarized protons at RHIC offers a clear opportunity to gain information on the Sivers gluon distribution function. D production at intermediate rapidity values is dominated by the elementary g g --> c cbar channel; contributions from q qbar --> c cbar s-channel become important only at very large values of x_F. In both processes there is no single spin transfer, so that the final c or cbar quarks are not polarized. Therefore, any transverse single spin asymmetry observed for D's produced in p(transv. polarized) p interactions cannot originate from the Collins fragmentation mechanism, but only from the Sivers effect in the distribution functions. In particular, any sizeable spin asymmetry measured in p(transv. polarized) p --> D X at mid-rapidity values will be a direct indication of a non zero Sivers gluon distribution function. We study the p(transv. polarized) p --> D X process including intrinsic transverse motion in the parton distribution and fragmentation functions and in the elementary dynamics, and show how results from RHIC could allow a measurement of the Sivers gluon distribution function. |
1206.0844 | Markus Diehl | Markus Diehl | Imaging partons in exclusive scattering processes | 4 pages, 5 figures. To appear in the proceedings of DIS 2012. v2:
minor corrections in text and figures | null | null | DESY 12-088 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spatial distribution of partons in the proton can be probed in suitable
exclusive scattering processes. I report on recent performance estimates for
parton imaging at a proposed Electron-Ion Collider.
| [
{
"created": "Tue, 5 Jun 2012 08:57:18 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Sep 2012 08:44:24 GMT",
"version": "v2"
}
] | 2012-09-21 | [
[
"Diehl",
"Markus",
""
]
] | The spatial distribution of partons in the proton can be probed in suitable exclusive scattering processes. I report on recent performance estimates for parton imaging at a proposed Electron-Ion Collider. |
2009.05680 | Mawande Lushozi | Isobel Kolb\'e, Mawande Lushozi, Larry D. McLerran, Gongming Yu | Distribution of Nuclear Matter and Radiation in the Fragmentation Region | 23 pages, 11 figures. We've added a pedagogical appendix to explain
the relation between different frames in a heavy ion collision. A footnote
has been added to the introduction. Figures 7 and 9 have been rescaled to
reflect the known nominal nuclear density. We have added a sentence below
Eq.3.30 to explain the implications of our results for baryon stopping power | Phys. Rev. C 103, 044908 (2021) | 10.1103/PhysRevC.103.044908 | INT-PUB-20-046 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the fragmentation (far forward/backward) region of heavy ion
collisions by considering an at-rest nucleus which is struck by a relativistic
sheet of colored glass. By means of a simple classical model, we calculate the
subsequent evolution of baryons and the associated radiation. We confirm that
the struck nucleus undergoes a compression and that the dynamics of the early
times of the collision are best described by two separate fluids as the
produced radiation's velocity distribution is very different to the velocity
distribution of the matter in the struck nucleus.
| [
{
"created": "Fri, 11 Sep 2020 22:44:41 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2021 16:17:36 GMT",
"version": "v2"
}
] | 2021-05-05 | [
[
"Kolbé",
"Isobel",
""
],
[
"Lushozi",
"Mawande",
""
],
[
"McLerran",
"Larry D.",
""
],
[
"Yu",
"Gongming",
""
]
] | We study the fragmentation (far forward/backward) region of heavy ion collisions by considering an at-rest nucleus which is struck by a relativistic sheet of colored glass. By means of a simple classical model, we calculate the subsequent evolution of baryons and the associated radiation. We confirm that the struck nucleus undergoes a compression and that the dynamics of the early times of the collision are best described by two separate fluids as the produced radiation's velocity distribution is very different to the velocity distribution of the matter in the struck nucleus. |
hep-ph/0407075 | Dmitry Chirkin | Dmitry Chirkin and Wolfgang Rhode | Propagating leptons through matter with Muon Monte Carlo (MMC) | MMC can be downloaded at http://icecube.wisc.edu/~dima/work/MUONPR/ | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An accurate simulation of the propagation of muons through matter is needed
for the analysis of data produced by muon/neutrino underground experiments. A
muon may sustain hundreds of interactions before it is detected by the
experiment. Since a small systematic uncertainty repeated hundreds of times may
lead to sizable errors, requirements on the precision of the muon propagation
code are very stringent. A new tool for propagating muon and tau charged
leptons through matter that is believed to meet these requirements is presented
here. An overview of the program is given and some results of its application
are discussed.
| [
{
"created": "Wed, 7 Jul 2004 16:30:30 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2008 15:19:52 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Aug 2016 20:33:57 GMT",
"version": "v3"
}
] | 2016-08-05 | [
[
"Chirkin",
"Dmitry",
""
],
[
"Rhode",
"Wolfgang",
""
]
] | An accurate simulation of the propagation of muons through matter is needed for the analysis of data produced by muon/neutrino underground experiments. A muon may sustain hundreds of interactions before it is detected by the experiment. Since a small systematic uncertainty repeated hundreds of times may lead to sizable errors, requirements on the precision of the muon propagation code are very stringent. A new tool for propagating muon and tau charged leptons through matter that is believed to meet these requirements is presented here. An overview of the program is given and some results of its application are discussed. |
2203.05889 | Tuomas Tenkanen | Leon S. Friedrich, Michael J. Ramsey-Musolf, Tuomas V. I. Tenkanen and
Van Que Tran | Addressing the Gravitational Wave - Collider Inverse Problem | 14 pages, 5 figures | null | null | NORDITA 2022-010 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We provide a roadmap for analyzing the interplay between hypothetical future
collider observations and the detection of a gravitational wave signal produced
by a strong first order electroweak phase transition in beyond the Standard
Model (BSM) theories. A cornerstone of this roadmap is a combination of a
dimensionally reduced, three-dimensional effective field theory and results of
both perturbation theory and non-perturbative lattice simulations. For the
first time we apply these state-of-the-art methods to a comprehensive parameter
space scan of a BSM theory. Concretely, we study an extension with the real
scalar triplet, which admits a possible two-step electroweak symmetry-breaking
thermal history. We find that (1) a first order transition during the second
step could generate a signal accessible to LISA generation detectors and (2)
the gravitational wave signal displays a strong sensitivity to the portal
coupling between the new scalar and the Higgs boson, and (3) the ability for
future experiments to detect the produced gravitational waves depends
decisively on the wall velocity of the bubbles produced during the phase
transition. We illustrate how a combination of direct and indirect measurements
of the new scalar properties, in combination with the presence or absence of a
gravitational wave detection, could test the model and identify the values of
the model parameters.
| [
{
"created": "Fri, 11 Mar 2022 12:47:40 GMT",
"version": "v1"
},
{
"created": "Fri, 3 May 2024 12:06:05 GMT",
"version": "v2"
}
] | 2024-05-06 | [
[
"Friedrich",
"Leon S.",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Tenkanen",
"Tuomas V. I.",
""
],
[
"Tran",
"Van Que",
""
]
] | We provide a roadmap for analyzing the interplay between hypothetical future collider observations and the detection of a gravitational wave signal produced by a strong first order electroweak phase transition in beyond the Standard Model (BSM) theories. A cornerstone of this roadmap is a combination of a dimensionally reduced, three-dimensional effective field theory and results of both perturbation theory and non-perturbative lattice simulations. For the first time we apply these state-of-the-art methods to a comprehensive parameter space scan of a BSM theory. Concretely, we study an extension with the real scalar triplet, which admits a possible two-step electroweak symmetry-breaking thermal history. We find that (1) a first order transition during the second step could generate a signal accessible to LISA generation detectors and (2) the gravitational wave signal displays a strong sensitivity to the portal coupling between the new scalar and the Higgs boson, and (3) the ability for future experiments to detect the produced gravitational waves depends decisively on the wall velocity of the bubbles produced during the phase transition. We illustrate how a combination of direct and indirect measurements of the new scalar properties, in combination with the presence or absence of a gravitational wave detection, could test the model and identify the values of the model parameters. |
2011.02510 | Nicol\'as Bernal Dr. | Nicol\'as Bernal, \'Oscar Zapata | Gravitational dark matter production: primordial black holes and UV
freeze-in | 5 pages, 2 figures. V2: matches accepted version in PLB | null | 10.1016/j.physletb.2021.136129 | PI/UAN-2020-682FT | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter (DM) interacting only gravitationally with the standard model
could have been produced in the early universe by Hawking evaporation of
primordial black holes (PBH). This mechanism is viable in a large range of DM
mass, spanning up to the Planck scale. However, DM is also unavoidably produced
by the irreducible UV gravitational freeze-in. We show that the latter
mechanism sets strong bounds, excluding large regions of the parameter space
favored by PBH production.
| [
{
"created": "Wed, 4 Nov 2020 19:23:37 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Feb 2021 13:54:52 GMT",
"version": "v2"
}
] | 2021-02-10 | [
[
"Bernal",
"Nicolás",
""
],
[
"Zapata",
"Óscar",
""
]
] | Dark matter (DM) interacting only gravitationally with the standard model could have been produced in the early universe by Hawking evaporation of primordial black holes (PBH). This mechanism is viable in a large range of DM mass, spanning up to the Planck scale. However, DM is also unavoidably produced by the irreducible UV gravitational freeze-in. We show that the latter mechanism sets strong bounds, excluding large regions of the parameter space favored by PBH production. |
0907.0728 | Mansoor Ur Rehman | Ilia Gogoladze, Mansoor Ur Rehman and Qaisar Shafi | Amelioration of Little Hierarchy Problem in SU(4)_c x SU(2)_L x SU(2)_R | 14 pages, 5 figures, 2 tables | Phys.Rev.D80:105002,2009 | 10.1103/PhysRevD.80.105002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The little hierarchy problem encountered in the constrained minimal
supersymmetric model (CMSSM) can be ameliorated in supersymmetric models based
on the gauge symmetry G_{422} \equiv SU(4)_c x SU(2)_L x SU(2)_R. The standard
assumption in CMSSM (and in SU(5) and SO(10)) of universal gaugino masses can
be relaxed in G_{422}, and this leads to a significant improvement in the
degree of fine tuning required to implement radiative electroweak breaking in
the presence of a characteristic supersymmetry breaking scale of around a TeV.
Examples of Higgs and sparticle mass spectra realized with 10% fine tuning are
presented.
| [
{
"created": "Fri, 3 Jul 2009 23:01:21 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gogoladze",
"Ilia",
""
],
[
"Rehman",
"Mansoor Ur",
""
],
[
"Shafi",
"Qaisar",
""
]
] | The little hierarchy problem encountered in the constrained minimal supersymmetric model (CMSSM) can be ameliorated in supersymmetric models based on the gauge symmetry G_{422} \equiv SU(4)_c x SU(2)_L x SU(2)_R. The standard assumption in CMSSM (and in SU(5) and SO(10)) of universal gaugino masses can be relaxed in G_{422}, and this leads to a significant improvement in the degree of fine tuning required to implement radiative electroweak breaking in the presence of a characteristic supersymmetry breaking scale of around a TeV. Examples of Higgs and sparticle mass spectra realized with 10% fine tuning are presented. |
2407.05598 | Xue Jie Liu | Xuejie Liu and Yue Tan and Xiaoyun Chen and Dianyong Chen and Hongxia
Huang and Jialun Ping | Probing the nature of the anticharmed-strange pentaquark states: mass
spectra, decays, and magnetic moments | null | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of the quark delocalization color screening model, a
systematic investigation of the anticharmed-strange pentaquark system is
performed using the resonance group method. The currently estimations predict
three bound states with estimated masses to be 2886 MeV, 3039 MeV, and 3153
MeV, respectively. Additionally, three resonance states are identified in
various scattering phase shifts processes. Among them, two resonance states
$\Sigma D$ and $\Sigma^{\ast}D^{\ast}$ with quantum number
$\frac{1}{2}(\frac{1}{2}^{-})$ are detected in channels $ND_{s}^{\ast}$ and
$ND$, and $\Sigma D^{\ast}$ and $\Lambda D$, with masses and decay widths of
($M_{R}=3053\sim3055$ MeV, $T_{total}=13.0\sim13.4$ MeV) and
($M_{R}=3389\sim3390$ MeV, $T_{total}=10.4$ MeV), respectively. In the $\Lambda
D^{\ast}$ and $\Sigma D^{\ast}$ channels, a resonance state with quantum number
$\frac{1}{2}(\frac{3}{2}^{-})$ is discovered, with its mass and decay width
being $3250\sim3252$ MeV and 4.4 MeV, respectively. These predicted pentaquark
states have $\bar{c}snnn$ quark compositions, allowing them to be recognized as
genuine pentaquark states. To validate these predictions, it is expected that
upcoming experiments will further explore the predicted resonance and bound
states in these possible decay channels.
| [
{
"created": "Mon, 8 Jul 2024 04:21:11 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Liu",
"Xuejie",
""
],
[
"Tan",
"Yue",
""
],
[
"Chen",
"Xiaoyun",
""
],
[
"Chen",
"Dianyong",
""
],
[
"Huang",
"Hongxia",
""
],
[
"Ping",
"Jialun",
""
]
] | Within the framework of the quark delocalization color screening model, a systematic investigation of the anticharmed-strange pentaquark system is performed using the resonance group method. The currently estimations predict three bound states with estimated masses to be 2886 MeV, 3039 MeV, and 3153 MeV, respectively. Additionally, three resonance states are identified in various scattering phase shifts processes. Among them, two resonance states $\Sigma D$ and $\Sigma^{\ast}D^{\ast}$ with quantum number $\frac{1}{2}(\frac{1}{2}^{-})$ are detected in channels $ND_{s}^{\ast}$ and $ND$, and $\Sigma D^{\ast}$ and $\Lambda D$, with masses and decay widths of ($M_{R}=3053\sim3055$ MeV, $T_{total}=13.0\sim13.4$ MeV) and ($M_{R}=3389\sim3390$ MeV, $T_{total}=10.4$ MeV), respectively. In the $\Lambda D^{\ast}$ and $\Sigma D^{\ast}$ channels, a resonance state with quantum number $\frac{1}{2}(\frac{3}{2}^{-})$ is discovered, with its mass and decay width being $3250\sim3252$ MeV and 4.4 MeV, respectively. These predicted pentaquark states have $\bar{c}snnn$ quark compositions, allowing them to be recognized as genuine pentaquark states. To validate these predictions, it is expected that upcoming experiments will further explore the predicted resonance and bound states in these possible decay channels. |
1909.10244 | Yannick Ulrich | T. Engel, A. Signer and Y. Ulrich | A subtraction scheme for massive QED | 25 pages, 6 figures, published version | J. High Energ. Phys. (2020) 2020: 085 | 10.1007/JHEP01(2020)085 | PSI-PR-19-19, ZU-TH 43/19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extension of the FKS subtraction scheme beyond next-to-leading
order to deal with soft singularities in fully differential calculations within
QED with massive fermions. After a detailed discussion of the
next-to-next-to-leading order case, we show how to extend the scheme to even
higher orders in perturbation theory. As an application we discuss the
computation of the next-to-next-to-leading order QED corrections to the muon
decay and present differential results with full electron mass dependence.
| [
{
"created": "Mon, 23 Sep 2019 09:35:48 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jan 2020 07:10:11 GMT",
"version": "v2"
}
] | 2020-01-20 | [
[
"Engel",
"T.",
""
],
[
"Signer",
"A.",
""
],
[
"Ulrich",
"Y.",
""
]
] | We present an extension of the FKS subtraction scheme beyond next-to-leading order to deal with soft singularities in fully differential calculations within QED with massive fermions. After a detailed discussion of the next-to-next-to-leading order case, we show how to extend the scheme to even higher orders in perturbation theory. As an application we discuss the computation of the next-to-next-to-leading order QED corrections to the muon decay and present differential results with full electron mass dependence. |
hep-ph/9811258 | David Bowser-Chao | David Bowser-Chao, Darwin Chang, and Wai-Yee Keung | On A New Class of Models for Soft CP Violation | Presented by Darwin Chang. Contribution to International Conference
on High Energy Physics, 1998, Triumf | null | null | null | hep-ph | null | We elaborate on a new class of models proposed recently by us and compare
with another class proposed by Georgi and Glashow(GG). The models can be
roughly classified as the righted-handed (or left-handed) models in our (or
GG's) case. Both classes of models use softly broken CP symmetry to suppress
tree level KM phase as well as the strong CP phase. The measured value of the
CP-violating parameter $\epsilon$ are accounted for by employing a new heavy
sector of scalars and vectorial fermions. The models can be milliweak or
superweak in nature depending on the scale of the heavy sector. We review the
phenomenology of the right-handed models and compare with the left-handed
models.
| [
{
"created": "Fri, 6 Nov 1998 04:23:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bowser-Chao",
"David",
""
],
[
"Chang",
"Darwin",
""
],
[
"Keung",
"Wai-Yee",
""
]
] | We elaborate on a new class of models proposed recently by us and compare with another class proposed by Georgi and Glashow(GG). The models can be roughly classified as the righted-handed (or left-handed) models in our (or GG's) case. Both classes of models use softly broken CP symmetry to suppress tree level KM phase as well as the strong CP phase. The measured value of the CP-violating parameter $\epsilon$ are accounted for by employing a new heavy sector of scalars and vectorial fermions. The models can be milliweak or superweak in nature depending on the scale of the heavy sector. We review the phenomenology of the right-handed models and compare with the left-handed models. |
0706.2532 | Probir Roy | Probir Roy (Tata Inst.) | Neutrino symmetries from high to low scales | 8 pages, 2 figures. Talk given at the International Workshop on
Theoretical and Experimental Physics, IIT (Roorkee), March 2007 | AIPConf.Proc.939:286-293,2007 | 10.1063/1.2803817 | null | hep-ph | null | Proposed symmetry relations, e.g., quark-lepton complementarity (QLC) or
tribimaximal mixing (TBM), need to be imposed at a high scale $\wedge \sim
10^{12}$ GeV characterising the large masses of right-handed neutrinos required
to implement the seesaw mechanism. RG evolution down to the laboratory scale
$\lambda \sim 10^3$ GeV, generically prone to spoil these relations and their
predicted neutrino mixing patterns, can be made to preserve them by
appropriately constraining the Majorana phases $\alpha_{2,3}$. This is
explicitly demonstrated in the MSSM for two versions of QLC and two versions of
TBM. A preference for $\alpha_2 \simeq \pi$ (i.e. $m_1 \simeq - m_2$) emerges
in each case. Discrimination among the four cases is shown to be possible by
future measurements of $\theta_{13}$.
| [
{
"created": "Mon, 18 Jun 2007 06:00:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Roy",
"Probir",
"",
"Tata Inst."
]
] | Proposed symmetry relations, e.g., quark-lepton complementarity (QLC) or tribimaximal mixing (TBM), need to be imposed at a high scale $\wedge \sim 10^{12}$ GeV characterising the large masses of right-handed neutrinos required to implement the seesaw mechanism. RG evolution down to the laboratory scale $\lambda \sim 10^3$ GeV, generically prone to spoil these relations and their predicted neutrino mixing patterns, can be made to preserve them by appropriately constraining the Majorana phases $\alpha_{2,3}$. This is explicitly demonstrated in the MSSM for two versions of QLC and two versions of TBM. A preference for $\alpha_2 \simeq \pi$ (i.e. $m_1 \simeq - m_2$) emerges in each case. Discrimination among the four cases is shown to be possible by future measurements of $\theta_{13}$. |
hep-ph/0411261 | Michal Czakon | M. Czakon | The Four-Loop QCD Beta-Function and Anomalous Dimensions | 14 pages | Nucl.Phys.B710:485-498,2005 | 10.1016/j.nuclphysb.2005.01.012 | DESY 04-223, SFB/CPP-04-62 | hep-ph | null | The four-loop beta-function of quantum chromodynamics is calculated and
agreement is found with the previous result. The anomalous dimensions of the
quark-gluon vertex, and quark, gluon and ghost fields are given for a general
compact simple Lie group.
| [
{
"created": "Fri, 19 Nov 2004 19:18:53 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Nov 2004 17:52:25 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Czakon",
"M.",
""
]
] | The four-loop beta-function of quantum chromodynamics is calculated and agreement is found with the previous result. The anomalous dimensions of the quark-gluon vertex, and quark, gluon and ghost fields are given for a general compact simple Lie group. |
hep-ph/0505187 | Dumitru Ghilencea | D. M. Ghilencea, Hyun Min Lee | Higher Derivative Operators from Transmission of Supersymmetry Breaking
on S_1/Z_2 | 29 pages, LaTeX. Added Section 4 ("Phenomenological implications:
living with ghosts?") and Appendix B | JHEP 0509:024,2005 | 10.1088/1126-6708/2005/09/024 | DAMTP-2005-34, DESY-05-073 | hep-ph hep-th | null | We discuss the role that higher derivative operators play in field theory
orbifold compactifications on S_1/Z_2 with local and non-local (Scherk-Schwarz)
breaking of supersymmetry. Integrating out the bulk fields generates
brane-localised higher derivative counterterms to the mass of the brane (or
zero-mode of the bulk) scalar field, identified with the Higgs field in many
realistic models. Both Yukawa and gauge interactions are considered and the
one-loop results found can be used to study the ``running'' of the scalar field
mass with respect to the momentum scale in 5D orbifolds. In particular this
allows the study of the behaviour of the mass under UV scaling of the momentum.
The relation between supersymmetry breaking and the presence of higher
derivative counterterms to the mass of the scalar field is investigated. This
shows that, regardless of the breaking mechanism, (initial) supersymmetry
cannot, in general, prevent the emergence of such operators. Some implications
for phenomenology of the higher derivative operators are also presented.
| [
{
"created": "Fri, 20 May 2005 21:17:28 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jun 2005 17:37:26 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Sep 2005 17:38:53 GMT",
"version": "v3"
}
] | 2010-11-19 | [
[
"Ghilencea",
"D. M.",
""
],
[
"Lee",
"Hyun Min",
""
]
] | We discuss the role that higher derivative operators play in field theory orbifold compactifications on S_1/Z_2 with local and non-local (Scherk-Schwarz) breaking of supersymmetry. Integrating out the bulk fields generates brane-localised higher derivative counterterms to the mass of the brane (or zero-mode of the bulk) scalar field, identified with the Higgs field in many realistic models. Both Yukawa and gauge interactions are considered and the one-loop results found can be used to study the ``running'' of the scalar field mass with respect to the momentum scale in 5D orbifolds. In particular this allows the study of the behaviour of the mass under UV scaling of the momentum. The relation between supersymmetry breaking and the presence of higher derivative counterterms to the mass of the scalar field is investigated. This shows that, regardless of the breaking mechanism, (initial) supersymmetry cannot, in general, prevent the emergence of such operators. Some implications for phenomenology of the higher derivative operators are also presented. |
1204.2292 | Carlos Tamarit | C. Tamarit | Decoupling heavy sparticles in hierarchical SUSY scenarios: Two-loop
Renormalization Group equations | 51 pages, one figure. Full beta functions can be found in additional
text files. v2: Uploaded ancillary files with beta functions. v3: Fixed
problem with references. v4: Added section with final comments. v5. Fixed
formulae for gaugino masses (Split SUSY results now agree with
arXiv:1312.5220). Added results for 2 loop Higgs anomalous dimension | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two loop renormalization group equations for dimensionless as well as
dimensionful parameters are obtained for the low energy theories that result
from decoupling heavy scalar particles in Split SUSY and Effective SUSY
scenarios, assuming that only a single Higgs field survives at low energy. For
the Effective SUSY case two scenarios are considered: first, when the only
light third generation scalars are the partners of the left-handed quark
doublet and the right-handed top quark --which yields the minimal matter
content compatible with naturalness-- and second, when all the scalars of the
third generation are light. These beta functions implementing decoupling will
be useful to avoid the problems of perturbation theory in the MSSM in a
mass-independent scheme such as DR-bar when large hierarchies in the spectrum
are present.
| [
{
"created": "Tue, 10 Apr 2012 21:54:19 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2012 15:42:08 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jun 2012 16:07:50 GMT",
"version": "v3"
},
{
"created": "Fri, 30 Aug 2013 20:18:03 GMT",
"version": "v4"
},
{
"c... | 2015-03-13 | [
[
"Tamarit",
"C.",
""
]
] | Two loop renormalization group equations for dimensionless as well as dimensionful parameters are obtained for the low energy theories that result from decoupling heavy scalar particles in Split SUSY and Effective SUSY scenarios, assuming that only a single Higgs field survives at low energy. For the Effective SUSY case two scenarios are considered: first, when the only light third generation scalars are the partners of the left-handed quark doublet and the right-handed top quark --which yields the minimal matter content compatible with naturalness-- and second, when all the scalars of the third generation are light. These beta functions implementing decoupling will be useful to avoid the problems of perturbation theory in the MSSM in a mass-independent scheme such as DR-bar when large hierarchies in the spectrum are present. |
1905.04272 | Gergely Fejos | G. Fejos, T. Hatsuda | Flows of multicomponent scalar models with U(1) gauge symmetry | 13 pages, 4 figures, matches published version | Phys. Rev. D 100, 036007 (2019) | 10.1103/PhysRevD.100.036007 | RIKEN-iTHEMS-Report-19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the renormalization group flows of multicomponent scalar
theories with $U(1)$ gauge symmetry using the functional renormalization group
method. The scalar sector is built up from traces of matrix fields that belong
to simple, compact Lie algebras. We find that in general these theories are
non-renormalizable even at zero gauge coupling, but if we add a $U(1)$ factor
to the Lie algebra structure, then they are consistent. In accordance with our
earlier findings, fluctuations introduce anomalous, regulator dependent gauge
contributions, which are only consistent with the flow equation for a given set
of gauge fixing parameters. We establish connections between regularization
procedures in the standard covariant and the $R_\xi$ gauges arguing that one is
not tied by introducing regulators at the level of the functional integral, and
it is allowed to switch between schemes at different levels of the
calculations. We calculate $\beta$ functions, classify fixed points, and
clarify compatibility of the flow equation and the Ward-Takahashi identity
between the scalar wavefunction renormalization and the charge rescaling
factor.
| [
{
"created": "Fri, 10 May 2019 17:22:17 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Aug 2019 19:48:54 GMT",
"version": "v2"
}
] | 2019-08-28 | [
[
"Fejos",
"G.",
""
],
[
"Hatsuda",
"T.",
""
]
] | We investigate the renormalization group flows of multicomponent scalar theories with $U(1)$ gauge symmetry using the functional renormalization group method. The scalar sector is built up from traces of matrix fields that belong to simple, compact Lie algebras. We find that in general these theories are non-renormalizable even at zero gauge coupling, but if we add a $U(1)$ factor to the Lie algebra structure, then they are consistent. In accordance with our earlier findings, fluctuations introduce anomalous, regulator dependent gauge contributions, which are only consistent with the flow equation for a given set of gauge fixing parameters. We establish connections between regularization procedures in the standard covariant and the $R_\xi$ gauges arguing that one is not tied by introducing regulators at the level of the functional integral, and it is allowed to switch between schemes at different levels of the calculations. We calculate $\beta$ functions, classify fixed points, and clarify compatibility of the flow equation and the Ward-Takahashi identity between the scalar wavefunction renormalization and the charge rescaling factor. |
hep-ph/0508143 | Christopher Gorham Lester | Christopher G. Lester, Michael A. Parker and Martin J. White | Determining SUSY model parameters and masses at the LHC using
cross-sections, kinematic edges and other observables | 42 pages, many figures | JHEP0601:080,2006 | 10.1088/1126-6708/2006/01/080 | CAV-HEP-2005-15, ATL-PHYS-PUB-2005-013, ATL-COM-PHYS-2005-033 | hep-ph | null | We address the problem of mass measurements of supersymmetric particles at
the Large Hadron Collider, using the ATLAS detector as an example. By using
Markov Chain sampling techniques to combine standard measurements of kinematic
edges in the invariant mass distributions of decay products with a measurement
of a missing $p_T$ cross-section, we show that the precision of mass
measurements at the LHC can be dramatically improved, even when we do not
assume that we have measured the kinematic endpoints precisely, or that we have
identified exactly which particles are involved in the decay chain causing the
endpoints. The generality of the technique is demonstrated in a preliminary
investigation of a non-universal SUGRA model, in which we relax the
requirements of mSUGRA by breaking the degeneracy of the GUT scale gaugino
masses. The model studied is compatible with the WMAP limits on dark matter
relic density.
| [
{
"created": "Fri, 12 Aug 2005 00:19:10 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2005 16:38:29 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Lester",
"Christopher G.",
""
],
[
"Parker",
"Michael A.",
""
],
[
"White",
"Martin J.",
""
]
] | We address the problem of mass measurements of supersymmetric particles at the Large Hadron Collider, using the ATLAS detector as an example. By using Markov Chain sampling techniques to combine standard measurements of kinematic edges in the invariant mass distributions of decay products with a measurement of a missing $p_T$ cross-section, we show that the precision of mass measurements at the LHC can be dramatically improved, even when we do not assume that we have measured the kinematic endpoints precisely, or that we have identified exactly which particles are involved in the decay chain causing the endpoints. The generality of the technique is demonstrated in a preliminary investigation of a non-universal SUGRA model, in which we relax the requirements of mSUGRA by breaking the degeneracy of the GUT scale gaugino masses. The model studied is compatible with the WMAP limits on dark matter relic density. |
1207.6587 | Liliana Apolin\'ario | Liliana Apolin\'ario, N\'estor Armesto, Let\'icia Cunqueiro | Background subtraction and jet quenching on jet reconstruction | 4 pages, 3 figures, Proceedings for Hard Probes 2012 | null | 10.1016/j.nuclphysa.2012.12.004 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to assess the ability of jet observables to constrain the
characteristics of the medium produced in heavy-ion collisions at the LHC, we
investigate the influence of background subtraction and jet quenching on jet
reconstruction, with focus on the dijet asymmetry as currently studied by ATLAS
and CMS. Using a toy model, we examine the influence of different background
subtraction methods on dijet momentum imbalance and azimuthal distributions. We
compare the usual jet-area based background subtraction technique and a variant
of the noise-pedestal subtraction method used by CMS. The purpose of this work
is to understand what are the differences between the two techniques, given the
same event configuration. We analyze the influence of the quenching effect
using the Q-PYTHIA Monte Carlo on the previous observables and to what extent
Q-PYTHIA is able to reproduce the CMS data for the average missing transverse
momentum that seems to indicate the presence of large angle emission of soft
particles.
| [
{
"created": "Fri, 27 Jul 2012 16:07:24 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Sep 2012 10:00:09 GMT",
"version": "v2"
}
] | 2013-01-04 | [
[
"Apolinário",
"Liliana",
""
],
[
"Armesto",
"Néstor",
""
],
[
"Cunqueiro",
"Letícia",
""
]
] | In order to assess the ability of jet observables to constrain the characteristics of the medium produced in heavy-ion collisions at the LHC, we investigate the influence of background subtraction and jet quenching on jet reconstruction, with focus on the dijet asymmetry as currently studied by ATLAS and CMS. Using a toy model, we examine the influence of different background subtraction methods on dijet momentum imbalance and azimuthal distributions. We compare the usual jet-area based background subtraction technique and a variant of the noise-pedestal subtraction method used by CMS. The purpose of this work is to understand what are the differences between the two techniques, given the same event configuration. We analyze the influence of the quenching effect using the Q-PYTHIA Monte Carlo on the previous observables and to what extent Q-PYTHIA is able to reproduce the CMS data for the average missing transverse momentum that seems to indicate the presence of large angle emission of soft particles. |
2402.02903 | Xiangkun Dong | Xiang-Kun Dong, Teng Ji, Feng-Kun Guo, Ulf-G. Mei{\ss}ner and
Bing-Song Zou | Hints of the $J^{PC}=0^{--}$ and $1^{--}$ $K^*\bar K_1(1270)$ Molecules
in the $J/\psi\to\phi\eta\eta'$ Decay | 11pages, 8figures and 1 table | Phys.Lett.B 853 (2024) 138646 | 10.1016/j.physletb.2024.138646 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The primary objective of this study is to investigate hadronic molecules of
$K^*\bar K_1(1270)$ using a one-boson-exchange model, which incorporates
exchanges of vector and pseudoscalar mesons in the $t$-channel, as well as the
pion exchange in the $u$-channel. Additionally, careful consideration is given
to the three-body effects resulting from the on-shell pion originating from
$K_1(1270)\to K^*\pi$. Then the BESIII data of the $J/\psi\to\phi\eta\eta'$
process is fitted using the $K^*\bar K_1(1270)$ scattering amplitude with
$J^{PC}=0^{--}$ or $1^{--}$. The analysis reveals that both the $J^{PC}=0^{--}$
and $1^{--}$ assumptions for $K^*\bar K_1(1270)$ scattering provide good
descriptions of the data, with similar fit qualities. Notably, the parameters
obtained from the best fits indicate the existence of $K^*\bar K_1(1270)$ bound
states, denoted by $\phi(2100)$ and $\phi_0(2100)$ for the $1^{--}$ and
$0^{--}$ states, respectively. The current experimental data, including the
$\eta$ polar angular distribution, cannot distinguish which $K^*\bar K_1(1270)$
bound state contributes to the $J/\psi\to\phi\eta\eta'$ process, or if both are
involved. Therefore, we propose further explorations of this process, as well
as other processes, in upcoming experiments with many more $J/\psi$ events to
disentangle the different possibilities.
| [
{
"created": "Mon, 5 Feb 2024 11:16:10 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2024 08:31:36 GMT",
"version": "v2"
}
] | 2024-04-24 | [
[
"Dong",
"Xiang-Kun",
""
],
[
"Ji",
"Teng",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Zou",
"Bing-Song",
""
]
] | The primary objective of this study is to investigate hadronic molecules of $K^*\bar K_1(1270)$ using a one-boson-exchange model, which incorporates exchanges of vector and pseudoscalar mesons in the $t$-channel, as well as the pion exchange in the $u$-channel. Additionally, careful consideration is given to the three-body effects resulting from the on-shell pion originating from $K_1(1270)\to K^*\pi$. Then the BESIII data of the $J/\psi\to\phi\eta\eta'$ process is fitted using the $K^*\bar K_1(1270)$ scattering amplitude with $J^{PC}=0^{--}$ or $1^{--}$. The analysis reveals that both the $J^{PC}=0^{--}$ and $1^{--}$ assumptions for $K^*\bar K_1(1270)$ scattering provide good descriptions of the data, with similar fit qualities. Notably, the parameters obtained from the best fits indicate the existence of $K^*\bar K_1(1270)$ bound states, denoted by $\phi(2100)$ and $\phi_0(2100)$ for the $1^{--}$ and $0^{--}$ states, respectively. The current experimental data, including the $\eta$ polar angular distribution, cannot distinguish which $K^*\bar K_1(1270)$ bound state contributes to the $J/\psi\to\phi\eta\eta'$ process, or if both are involved. Therefore, we propose further explorations of this process, as well as other processes, in upcoming experiments with many more $J/\psi$ events to disentangle the different possibilities. |
hep-ph/0105099 | Francesco Hautmann | F. Hautmann | The endpoint region in radiative quarkonia decays | Presented at the DPF2000 Meeting, Ohio State University, August 2000.
(Version 2: minor typos corrected.) | Int.J.Mod.Phys. A16S1A (2001) 167-171 | 10.1142/S0217751X01006395 | null | hep-ph | null | We consider the inclusive radiative decays quarkonium -> gamma + hadrons and
examine the effects of soft QCD radiation on the photon energy spectrum near
the endpoint.
| [
{
"created": "Fri, 11 May 2001 02:09:37 GMT",
"version": "v1"
},
{
"created": "Wed, 30 May 2001 17:38:34 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Hautmann",
"F.",
""
]
] | We consider the inclusive radiative decays quarkonium -> gamma + hadrons and examine the effects of soft QCD radiation on the photon energy spectrum near the endpoint. |
1307.6157 | Lauren Wozniak Pearce | Lauren Pearce, Alexander Kusenko, and R. D. Peccei | Phenomenology of Supersymmetric Models with a Symmetry-Breaking Seesaw
Mechanism | 9 pages, 6 figures | Phys. Rev. D 88, 075011 (2013) | 10.1103/PhysRevD.88.075011 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore phenomenological implications of the minimal supersymmetric
standard model (MSSM) with a strong supersymmetry breaking trilinear term.
Supersymmetry breaking can trigger electroweak symmetry breaking via a
symmetry-breaking seesaw mechanism, which can lead to a low-energy theory with
multiple composite Higgs bosons. In this model, the electroweak phase
transition can be first-order for some generic values of parameters.
Furthermore, there are additional sources of CP violation in the Higgs sector.
This opens the possibility of electroweak baryogenesis in the strongly coupled
MSSM. The extended Higgs dynamics can be discovered at Large Hadron Collider or
at a future linear collider.
| [
{
"created": "Tue, 23 Jul 2013 17:01:44 GMT",
"version": "v1"
}
] | 2014-02-24 | [
[
"Pearce",
"Lauren",
""
],
[
"Kusenko",
"Alexander",
""
],
[
"Peccei",
"R. D.",
""
]
] | We explore phenomenological implications of the minimal supersymmetric standard model (MSSM) with a strong supersymmetry breaking trilinear term. Supersymmetry breaking can trigger electroweak symmetry breaking via a symmetry-breaking seesaw mechanism, which can lead to a low-energy theory with multiple composite Higgs bosons. In this model, the electroweak phase transition can be first-order for some generic values of parameters. Furthermore, there are additional sources of CP violation in the Higgs sector. This opens the possibility of electroweak baryogenesis in the strongly coupled MSSM. The extended Higgs dynamics can be discovered at Large Hadron Collider or at a future linear collider. |
hep-ph/0409093 | Carlos Garcia Canal | C.A. Garcia Canal | Summary of the Latin American Workshop on Fundamental Interactions | 10 pages | null | null | null | hep-ph | null | Summary of the Latin American Workshop on Fundamental Interactions held at
the Physics Department of the Universidad de Buenos Aires from 26 to 30 July
2004.
| [
{
"created": "Wed, 8 Sep 2004 15:37:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Canal",
"C. A. Garcia",
""
]
] | Summary of the Latin American Workshop on Fundamental Interactions held at the Physics Department of the Universidad de Buenos Aires from 26 to 30 July 2004. |
2402.14468 | Miguel Vanvlasselaer | Miguel Vanvlasselaer | Baryogenesis and leptogenesis with relativistic bubble walls | Contribution to CORFU23 | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we study the impact of first order phase transitions with fast
bubble walls on mechanisms of leptogenesis and baryogenesis. We begin our
exploration with the usual leptogenesis where the breaking of $B-L$ occurs via
a PT with fast walls. Then we move to a more exotic case where the $B-L$
breaking phase transition creates heavy particles in the plasma and catalizes
the leptogenesis. Finally, we apply the same production mechanism to the EWPT
at low energy and build a new model of EWBG. Those models are all original and
contain crucial new phenomenological aspects like the emission of large amount
of Gravitational waves.
| [
{
"created": "Thu, 22 Feb 2024 11:55:23 GMT",
"version": "v1"
}
] | 2024-02-23 | [
[
"Vanvlasselaer",
"Miguel",
""
]
] | In this talk, we study the impact of first order phase transitions with fast bubble walls on mechanisms of leptogenesis and baryogenesis. We begin our exploration with the usual leptogenesis where the breaking of $B-L$ occurs via a PT with fast walls. Then we move to a more exotic case where the $B-L$ breaking phase transition creates heavy particles in the plasma and catalizes the leptogenesis. Finally, we apply the same production mechanism to the EWPT at low energy and build a new model of EWBG. Those models are all original and contain crucial new phenomenological aspects like the emission of large amount of Gravitational waves. |
1501.07428 | Sin Kyu Kang | Sin Kyu Kang, Morimitsu Tanimoto | Prediction of Leptonic CP Phase in $A_4$ symmetric model | 15 pages, 3 figures | Phys. Rev. D 91, 073010 (2015) | 10.1103/PhysRevD.91.073010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider minimal modifications to tribimaximal (TBM) mixing matrix which
accommodate non-zero mixing angle $\theta_{13}$ and CP violation. We derive
four possible forms for the minimal modifications to TBM mixing in a model with
$A_4$ flavor symmetry by incorporating symmetry breaking terms appropriately.
We show how possible values of the Dirac-type CP phase $\delta_D$ can be
predicted with regards to two neutrino mixing angles in the standard
parametrization of the neutrino mixing matrix. Carrying out numerical analysis
based on the recent updated experimental results for neutrino mixing angles, we
predict the values of the CP phase for all possible cases. We also confront our
predictions of the CP phase with the updated fit.
| [
{
"created": "Thu, 29 Jan 2015 12:06:13 GMT",
"version": "v1"
}
] | 2015-04-16 | [
[
"Kang",
"Sin Kyu",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We consider minimal modifications to tribimaximal (TBM) mixing matrix which accommodate non-zero mixing angle $\theta_{13}$ and CP violation. We derive four possible forms for the minimal modifications to TBM mixing in a model with $A_4$ flavor symmetry by incorporating symmetry breaking terms appropriately. We show how possible values of the Dirac-type CP phase $\delta_D$ can be predicted with regards to two neutrino mixing angles in the standard parametrization of the neutrino mixing matrix. Carrying out numerical analysis based on the recent updated experimental results for neutrino mixing angles, we predict the values of the CP phase for all possible cases. We also confront our predictions of the CP phase with the updated fit. |
hep-ph/0410360 | Sebastian J\"ager | Sebastian Jager and Ulrich Nierste | Hadronic vs leptonic flavor and CP violation in SUSY SO(10) | 4 pages, 3 figures, latex, uses pdproc.sty (included) | null | null | PITHA-04/15, FERMILAB-CONF-04-296-T | hep-ph | null | We study hadronic and leptonic flavor physics in a SUSY SO(10) model proposed
by Chang, Masiero, and Murayama, which links b -> s transitions to the observed
large atmospheric neutrino mixing angle. We find large effects in B_s-B_s-bar
mixing and BR(tau -> mu gamma) and comment on B_d -> phi K_S.
| [
{
"created": "Wed, 27 Oct 2004 12:06:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jager",
"Sebastian",
""
],
[
"Nierste",
"Ulrich",
""
]
] | We study hadronic and leptonic flavor physics in a SUSY SO(10) model proposed by Chang, Masiero, and Murayama, which links b -> s transitions to the observed large atmospheric neutrino mixing angle. We find large effects in B_s-B_s-bar mixing and BR(tau -> mu gamma) and comment on B_d -> phi K_S. |
hep-ph/0606215 | Martin Block | Martin M. Block | Hadronic forward scattering: Predictions for the Large Hadron Collider
and cosmic rays | 191 pages, 67 figures, 16 tables; corrected fig. 15 | Phys.Rept.436:71-215,2006 | 10.1016/j.physrep.2006.06.003 | null | hep-ph hep-th | null | The status of hadron-hadron interactions is reviewed, with emphasis on the
forward and near-forward scattering regions. From analyticity, Finite Energy
Sum Rules are introduced from which new analyticity constraints are derived
that exploit the many very accurate low energy experimental cross sections,
i.e., they constrain the values of the asymptotic cross sections and their
derivatives at low energies just above the resonance regions, allowing us new
insights into duality. A new robust fitting technique is introduced in order to
`clean up' large data samples that are contaminated by outliers. Using our
analyticity constraints, new methods of fitting high energy hadronic data are
introduced which result in much more precise estimates of the fit parameters,
allowing accurate extrapolations to much higher energies. It's shown that the
$\gamma p$, $\pi^\pm p$ and nucleon-nucleon cross sections {\em all} go
asymptotically as $\ln^2s$, saturating the Froissart bound, while conclusively
ruling out $\ln s$ and $s^{\alpha}$ ($\alpha\sim 0.08$) behavior. Implications
of this saturation for predictions of $\sigma_{pp}$ and $\rho_{pp}$ at the LHC
and for cosmic rays p-air cross sections are given.
| [
{
"created": "Tue, 20 Jun 2006 15:03:31 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2006 17:54:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Block",
"Martin M.",
""
]
] | The status of hadron-hadron interactions is reviewed, with emphasis on the forward and near-forward scattering regions. From analyticity, Finite Energy Sum Rules are introduced from which new analyticity constraints are derived that exploit the many very accurate low energy experimental cross sections, i.e., they constrain the values of the asymptotic cross sections and their derivatives at low energies just above the resonance regions, allowing us new insights into duality. A new robust fitting technique is introduced in order to `clean up' large data samples that are contaminated by outliers. Using our analyticity constraints, new methods of fitting high energy hadronic data are introduced which result in much more precise estimates of the fit parameters, allowing accurate extrapolations to much higher energies. It's shown that the $\gamma p$, $\pi^\pm p$ and nucleon-nucleon cross sections {\em all} go asymptotically as $\ln^2s$, saturating the Froissart bound, while conclusively ruling out $\ln s$ and $s^{\alpha}$ ($\alpha\sim 0.08$) behavior. Implications of this saturation for predictions of $\sigma_{pp}$ and $\rho_{pp}$ at the LHC and for cosmic rays p-air cross sections are given. |
1012.5529 | Xavier Calmet | Xavier Calmet | Asymptotically safe weak interactions | 7 pages | Mod.Phys.Lett.A26:1571-1576,2011 | 10.1142/S0217732311035900 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We emphasize that the electroweak interactions without a Higgs boson are very
similar to quantum general relativity. The Higgs field could just be a dressing
field and might not exist as a propagating particle. In that interpretation,
the electroweak interactions without a Higgs boson could be renormalizable at
the non-perturbative level because of a non-trivial fixed point. Tree-level
unitarity in electroweak bosons scattering is restored by the running of the
weak scale.
| [
{
"created": "Sun, 26 Dec 2010 16:58:14 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Calmet",
"Xavier",
""
]
] | We emphasize that the electroweak interactions without a Higgs boson are very similar to quantum general relativity. The Higgs field could just be a dressing field and might not exist as a propagating particle. In that interpretation, the electroweak interactions without a Higgs boson could be renormalizable at the non-perturbative level because of a non-trivial fixed point. Tree-level unitarity in electroweak bosons scattering is restored by the running of the weak scale. |
1912.12194 | Carlo Ewerz | Daniel Britzger, Carlo Ewerz, Sasha Glazov, Otto Nachtmann, Stefan
Schmitt | The Tensor Pomeron and Small-x Deep Inelastic Scattering | 6 pages, talk presented by C.E. at XXVII International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2019), Torino, Italy,
April 2019 | PoS(DIS2019)052 | 10.22323/1.352.0052 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the tensor-pomeron model to small-$x$ deep-inelastic lepton-proton
scattering and photoproduction. Our model includes a soft and a hard tensor
pomeron as well as a reggeon contribution. Data with c.m. energies $6 <
\sqrt{s} < 318$ GeV and virtualities $Q^2 < 50 \,\mbox{GeV}^2$ are considered.
Our fit gives a very good description of the available data in this kinematic
region, including the latest HERA data for $x < 0.01$. In particular, the
transition region from low to high $Q^2$ is well described. Within the errors,
the hard pomeron is absent in photoproduction. The intercepts of the soft and
hard pomeron in the two-tensor-pomeron model are found to be $1.0935\,
({}^{+76}_{-64})$ and $1.3008 \,({}^{+73}_{-84})$, respectively. We argue that
a vector pomeron would not give any contribution to photoproduction.
| [
{
"created": "Fri, 27 Dec 2019 15:56:27 GMT",
"version": "v1"
}
] | 2020-01-23 | [
[
"Britzger",
"Daniel",
""
],
[
"Ewerz",
"Carlo",
""
],
[
"Glazov",
"Sasha",
""
],
[
"Nachtmann",
"Otto",
""
],
[
"Schmitt",
"Stefan",
""
]
] | We apply the tensor-pomeron model to small-$x$ deep-inelastic lepton-proton scattering and photoproduction. Our model includes a soft and a hard tensor pomeron as well as a reggeon contribution. Data with c.m. energies $6 < \sqrt{s} < 318$ GeV and virtualities $Q^2 < 50 \,\mbox{GeV}^2$ are considered. Our fit gives a very good description of the available data in this kinematic region, including the latest HERA data for $x < 0.01$. In particular, the transition region from low to high $Q^2$ is well described. Within the errors, the hard pomeron is absent in photoproduction. The intercepts of the soft and hard pomeron in the two-tensor-pomeron model are found to be $1.0935\, ({}^{+76}_{-64})$ and $1.3008 \,({}^{+73}_{-84})$, respectively. We argue that a vector pomeron would not give any contribution to photoproduction. |
0807.0420 | Alakabha Datta | Alakabha Datta | Deviation from Tri-Bimaximal Neutrino mixing from the Charged Lepton
Sector | 14 pages, no figures. Material and references added and reorganized.
Conclusions are unchanged | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tri-bimaximal mixing matrix is most likely the leading order term in the
description of leptonic mixing. We derive deviations from tri-bimaximal
mixing(TBM) due to corrections from the charged lepton sector. We assume a
decoupled 2-3 symmetry, which is a $Z_2$ symmetry, in the charged lepton sector
and another $Z_2$ symmetry in the neutrino sector. The TBM is obtained in the
flavor symmetric limit. We consider deviations from the TBM form arising from
the breaking of the 2-3 symmetry in the charged lepton sector but do not
consider deviations from the breaking of the flavor symmetry in the neutrino
sector. In particular we find the size of $\sin{\theta_{13}}$ to be related to
the deviation $\sin{\theta_{12}}$ from $\sqrt{1/3}$ while the deviation of
$\sin{\theta_{23}}$ from its tri-bimaximal value is $ \sim {m_{\mu} \over
m_{\tau}}$.
| [
{
"created": "Wed, 2 Jul 2008 18:31:51 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2008 02:11:14 GMT",
"version": "v2"
}
] | 2008-09-17 | [
[
"Datta",
"Alakabha",
""
]
] | The tri-bimaximal mixing matrix is most likely the leading order term in the description of leptonic mixing. We derive deviations from tri-bimaximal mixing(TBM) due to corrections from the charged lepton sector. We assume a decoupled 2-3 symmetry, which is a $Z_2$ symmetry, in the charged lepton sector and another $Z_2$ symmetry in the neutrino sector. The TBM is obtained in the flavor symmetric limit. We consider deviations from the TBM form arising from the breaking of the 2-3 symmetry in the charged lepton sector but do not consider deviations from the breaking of the flavor symmetry in the neutrino sector. In particular we find the size of $\sin{\theta_{13}}$ to be related to the deviation $\sin{\theta_{12}}$ from $\sqrt{1/3}$ while the deviation of $\sin{\theta_{23}}$ from its tri-bimaximal value is $ \sim {m_{\mu} \over m_{\tau}}$. |
1909.02014 | Ke-Pan Xie | Ligong Bian, Yongcheng Wu, Ke-Pan Xie | Electroweak phase transition with composite Higgs models: calculability,
gravitational waves and collider searches | 36 pages, 5 figures. The version to be appear on JHEP | null | 10.1007/JHEP12(2019)028 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the strong first order electroweak phase transition (SFOEWPT) with
the $SO(6)/SO(5)$ composite Higgs model, whose scalar sector contains one Higgs
doublet and one real singlet. Six benchmark models are built with fermion
embeddings in $\textbf{1}$, $\textbf{6}$, and $\textbf{15}$ of $SO(6)$. We show
that SFOEWPT cannot be triggered under the minimal Higgs potential hypothesis,
which assumes the scalar potential is dominated by the form factors from the
lightest composite resonances. To get a SFOEWPT, the contributions from local
operators induced by physics above the cutoff scale are needed. We take the
$\textbf{6}+\textbf{6}$ model as an example to investigate the gravitational
waves prediction and the related collider phenomenology.
| [
{
"created": "Wed, 4 Sep 2019 18:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Dec 2019 11:09:22 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Bian",
"Ligong",
""
],
[
"Wu",
"Yongcheng",
""
],
[
"Xie",
"Ke-Pan",
""
]
] | We study the strong first order electroweak phase transition (SFOEWPT) with the $SO(6)/SO(5)$ composite Higgs model, whose scalar sector contains one Higgs doublet and one real singlet. Six benchmark models are built with fermion embeddings in $\textbf{1}$, $\textbf{6}$, and $\textbf{15}$ of $SO(6)$. We show that SFOEWPT cannot be triggered under the minimal Higgs potential hypothesis, which assumes the scalar potential is dominated by the form factors from the lightest composite resonances. To get a SFOEWPT, the contributions from local operators induced by physics above the cutoff scale are needed. We take the $\textbf{6}+\textbf{6}$ model as an example to investigate the gravitational waves prediction and the related collider phenomenology. |
1906.04132 | P. S. Bhupal Dev | Arindam Das, P. S. Bhupal Dev, Nobuchika Okada | Long-lived TeV-scale right-handed neutrino production at the LHC in
gauged $U(1)_X$ model | 31 pages, 5 figures, 2 tables | Phys. Lett. B 799 (2019) 135052 | 10.1016/j.physletb.2019.135052 | FERMILAB-PUB-19-268-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A gauged $U(1)_X$ extension of the Standard Model is a simple and consistent
framework to naturally incorporate three right-handed neutrinos (RHNs) for
generating the observed light neutrino masses and mixing by the type-I seesaw
mechanism. We examine the collider testability of the $U(1)_X$ model, both in
its minimal form with the conventional charges, as well as with an alternative
charge assignment, via the resonant production of the $U(1)_X$ gauge boson
($Z^\prime$) and its subsequent decay into a pair of RHNs. We first derive an
updated upper limit on the new gauge coupling $g_X$ as a function of the
$Z'$-boson mass from the latest LHC dilepton searches. Then we identify the
maximum possible cross section for the RHN pair-production under these
constraints. Finally, we investigate the possibility of having one of the RHNs
long-lived, even for a TeV-scale mass. Employing the general parametrization
for the light neutrino mass matrix to reproduce the observed neutrino
oscillation data, we perform a parameter scan and find a simple formula for the
maximum RHN lifetime as a function of the lightest neutrino mass eigenvalue
($m_{\rm lightest}$). We find that for $m_{\rm lightest}\lesssim 10^{-5}$ eV,
one of the RHNs in the minimal $U(1)_X$ scenario can be long-lived with a
displaced-vertex signature which can be searched for at the LHC and/or with a
dedicated long-lived particle detector, such as MATHUSLA. In other words, once
a long-lived RHN is observed, we can set an upper bound on the lightest
neutrino mass in this model.
| [
{
"created": "Mon, 10 Jun 2019 17:10:43 GMT",
"version": "v1"
}
] | 2019-11-13 | [
[
"Das",
"Arindam",
""
],
[
"Dev",
"P. S. Bhupal",
""
],
[
"Okada",
"Nobuchika",
""
]
] | A gauged $U(1)_X$ extension of the Standard Model is a simple and consistent framework to naturally incorporate three right-handed neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the type-I seesaw mechanism. We examine the collider testability of the $U(1)_X$ model, both in its minimal form with the conventional charges, as well as with an alternative charge assignment, via the resonant production of the $U(1)_X$ gauge boson ($Z^\prime$) and its subsequent decay into a pair of RHNs. We first derive an updated upper limit on the new gauge coupling $g_X$ as a function of the $Z'$-boson mass from the latest LHC dilepton searches. Then we identify the maximum possible cross section for the RHN pair-production under these constraints. Finally, we investigate the possibility of having one of the RHNs long-lived, even for a TeV-scale mass. Employing the general parametrization for the light neutrino mass matrix to reproduce the observed neutrino oscillation data, we perform a parameter scan and find a simple formula for the maximum RHN lifetime as a function of the lightest neutrino mass eigenvalue ($m_{\rm lightest}$). We find that for $m_{\rm lightest}\lesssim 10^{-5}$ eV, one of the RHNs in the minimal $U(1)_X$ scenario can be long-lived with a displaced-vertex signature which can be searched for at the LHC and/or with a dedicated long-lived particle detector, such as MATHUSLA. In other words, once a long-lived RHN is observed, we can set an upper bound on the lightest neutrino mass in this model. |
2109.13609 | Sougata Ganguly | Ananya Tapadar, Sougata Ganguly, Sourov Roy | Non-adiabatic evolution of dark sector in the presence of
$U(1)_{L_\mu-L_\tau}$ gauge symmetry | 39 pages, 12 figures, 2 tables. Figure 1, new discussions in the
introduction and section 3.1 are added. Figure 9 modified. References
updated. Conclusions remain unchanged. Matches with the published version in
JCAP | JCAP05(2022)019 | 10.1088/1475-7516/2022/05/019 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In secluded dark sector scenario, the connection between the visible and the
dark sector can be established through a portal coupling and its presence opens
up the possibility of non-adiabatic evolution of the dark sector. To study the
non-adiabatic evolution of the dark sector, we have considered a $U(1)_{L_\mu -
L_\tau} \otimes U(1)_X$ extension of the standard model (SM). Here the dark
sector is charged only under $U(1)_X$ gauge symmetry whereas the SM fields are
singlet under this symmetry. Due to the presence of tree-level kinetic mixing
between $U(1)_X$ and $U(1)_{L_\mu - L_\tau}$ gauge bosons, the dark sector
evolves non-adiabatically and thermal equilibrium between the visible and dark
sector is governed by the portal coupling. Depending on the values of the
portal coupling ($\epsilon$), dark sector gauge coupling ($g_X$), mass of the
dark matter ($m_\chi$) and mass of the dark vector boson ($m_{Z^\prime}$), we
study the temperature evolution of the dark sector as well as the various
non-equilibrium stages of the dark sector in detail. Furthermore we have also
investigated the constraints on the model parameters from various laboratory
and astrophysical searches. We have found that the parameter space for the
non-adiabatic evolution of dark sector is significantly constrained for
$m_{Z^\prime}$ $\lesssim 100 \, {\rm MeV}$ from the observations of beam dump
experiments, stellar cooling etc. The relic density satisfied region of our
parameter space is consistent with the bounds from direct detection, and self
interaction of dark matter (SIDM) for the mass ratio $r \equiv
m_{Z^\prime}/m_\chi = 10^{-3}$ and these bounds will be more relaxed for larger
values of $r$. However the constraints from measurement of diffuse $\gamma$-ray
background flux and cosmic microwave background (CMB) anisotropy are strongest
for $r = 10^{-1}$ and for smaller values of $r$, they are not significant.
| [
{
"created": "Tue, 28 Sep 2021 10:52:05 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2022 14:41:35 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"Tapadar",
"Ananya",
""
],
[
"Ganguly",
"Sougata",
""
],
[
"Roy",
"Sourov",
""
]
] | In secluded dark sector scenario, the connection between the visible and the dark sector can be established through a portal coupling and its presence opens up the possibility of non-adiabatic evolution of the dark sector. To study the non-adiabatic evolution of the dark sector, we have considered a $U(1)_{L_\mu - L_\tau} \otimes U(1)_X$ extension of the standard model (SM). Here the dark sector is charged only under $U(1)_X$ gauge symmetry whereas the SM fields are singlet under this symmetry. Due to the presence of tree-level kinetic mixing between $U(1)_X$ and $U(1)_{L_\mu - L_\tau}$ gauge bosons, the dark sector evolves non-adiabatically and thermal equilibrium between the visible and dark sector is governed by the portal coupling. Depending on the values of the portal coupling ($\epsilon$), dark sector gauge coupling ($g_X$), mass of the dark matter ($m_\chi$) and mass of the dark vector boson ($m_{Z^\prime}$), we study the temperature evolution of the dark sector as well as the various non-equilibrium stages of the dark sector in detail. Furthermore we have also investigated the constraints on the model parameters from various laboratory and astrophysical searches. We have found that the parameter space for the non-adiabatic evolution of dark sector is significantly constrained for $m_{Z^\prime}$ $\lesssim 100 \, {\rm MeV}$ from the observations of beam dump experiments, stellar cooling etc. The relic density satisfied region of our parameter space is consistent with the bounds from direct detection, and self interaction of dark matter (SIDM) for the mass ratio $r \equiv m_{Z^\prime}/m_\chi = 10^{-3}$ and these bounds will be more relaxed for larger values of $r$. However the constraints from measurement of diffuse $\gamma$-ray background flux and cosmic microwave background (CMB) anisotropy are strongest for $r = 10^{-1}$ and for smaller values of $r$, they are not significant. |
hep-ph/0601259 | Christian Weiss | M. Strikman, C. Weiss | The black-disk limit in high-energy ep and pp scattering | 6 pages, 3 figures. Uses aipproc.cls. Contributed to proceedings of
PANIC05, Santa Fe, NM, Oct. 24-28, 2005 | AIP Conf.Proc.842:210-215,2006 | 10.1063/1.2220229 | JLAB-THY-06-461 | hep-ph | null | We review a recently proposed framework for studying the approach to the
unitarity limit in small-x processes in ep and pp scattering within the DGLAP
approximation. Our formulation is based on the correspondence between the
standard QCD factorization theorems for hard processes and the dipole picture
of small-x scattering in the leading logarithmic approximation. It allows us to
incorporate information about the transverse spatial distribution of gluons in
the proton (GPD) from exclusive vector meson production at HERA. We show that
the interaction of small-size color singlet configurations with the proton
approaches the "black-disk limit" (BDL) due to the growth of the DGLAP gluon
density at small x. This new dynamical regime is marginally visible in
diffractive DIS at HERA, and will be fully reached in central pp collisions at
LHC.
| [
{
"created": "Tue, 31 Jan 2006 03:28:37 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Strikman",
"M.",
""
],
[
"Weiss",
"C.",
""
]
] | We review a recently proposed framework for studying the approach to the unitarity limit in small-x processes in ep and pp scattering within the DGLAP approximation. Our formulation is based on the correspondence between the standard QCD factorization theorems for hard processes and the dipole picture of small-x scattering in the leading logarithmic approximation. It allows us to incorporate information about the transverse spatial distribution of gluons in the proton (GPD) from exclusive vector meson production at HERA. We show that the interaction of small-size color singlet configurations with the proton approaches the "black-disk limit" (BDL) due to the growth of the DGLAP gluon density at small x. This new dynamical regime is marginally visible in diffractive DIS at HERA, and will be fully reached in central pp collisions at LHC. |
2104.13942 | N\'estor G. Gracia | N\'estor G. Gracia and Vicent Mateu | Towards massless and massive event shapes in the large-$\beta_0$ limit | 60 pages + appendices, 19 figures, 6 tables. Added references, fixed
typos, matches published version | null | 10.1007/JHEP07(2021)229 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for SCET and bHQET matching coefficients and jet functions
in the large-$\beta_0$ limit. Our computations exactly predict all terms of the
form $\alpha_s^{n+1} n_f^n$ for any $n\geq 0$, and we find full agreement with
the coefficients computed in the full theory up to $\mathcal{O}(\alpha_s^4)$.
We obtain all-order closed expressions for the cusp and non-cusp anomalous
dimensions (which turn out to be unambiguous) as well as matrix elements (with
ambiguities) in this limit, which can be easily expanded to arbitrarily high
powers of $\alpha_s$ using recursive algorithms to obtain the corresponding
fixed-order coefficients. Examining the poles laying on the positive real axis
of the Borel-transform variable $u$ we quantify the perturbative convergence of
a series and estimate the size of non-perturbative corrections. We find a so
far unknown $u=1/2$ renormalon in the bHQET hard factor $H_m$ that affects the
normalization of the peak differential cross section for boosted top quark pair
production. For ambiguous series the so-called Borel sum is defined with the
principal value prescription. Furthermore, one can assign an ambiguity based on
the arbitrariness of avoiding the poles by contour deformation into the
positive or negative imaginary half-plane. Finally, we compute the relation
between the pole mass and four low-scale short distance masses in the
large-$\beta_0$ approximation (MSR, RS and two versions of the jet mass), work
out their $\mu$- and $R$-evolution in this limit, and study how their
implementation improves the convergence of the position-space bHQET jet
function, whose three-loop coefficient in full QCD is numerically estimated.
| [
{
"created": "Wed, 28 Apr 2021 18:00:36 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2021 08:56:33 GMT",
"version": "v2"
}
] | 2021-09-03 | [
[
"Gracia",
"Néstor G.",
""
],
[
"Mateu",
"Vicent",
""
]
] | We present results for SCET and bHQET matching coefficients and jet functions in the large-$\beta_0$ limit. Our computations exactly predict all terms of the form $\alpha_s^{n+1} n_f^n$ for any $n\geq 0$, and we find full agreement with the coefficients computed in the full theory up to $\mathcal{O}(\alpha_s^4)$. We obtain all-order closed expressions for the cusp and non-cusp anomalous dimensions (which turn out to be unambiguous) as well as matrix elements (with ambiguities) in this limit, which can be easily expanded to arbitrarily high powers of $\alpha_s$ using recursive algorithms to obtain the corresponding fixed-order coefficients. Examining the poles laying on the positive real axis of the Borel-transform variable $u$ we quantify the perturbative convergence of a series and estimate the size of non-perturbative corrections. We find a so far unknown $u=1/2$ renormalon in the bHQET hard factor $H_m$ that affects the normalization of the peak differential cross section for boosted top quark pair production. For ambiguous series the so-called Borel sum is defined with the principal value prescription. Furthermore, one can assign an ambiguity based on the arbitrariness of avoiding the poles by contour deformation into the positive or negative imaginary half-plane. Finally, we compute the relation between the pole mass and four low-scale short distance masses in the large-$\beta_0$ approximation (MSR, RS and two versions of the jet mass), work out their $\mu$- and $R$-evolution in this limit, and study how their implementation improves the convergence of the position-space bHQET jet function, whose three-loop coefficient in full QCD is numerically estimated. |
2302.06654 | Arpan Hait | Debtosh Chowdhury, Arpan Hait | Thermalization in the presence of a time-dependent dissipation and its
impact on dark matter production | 27 pages, 9 figures. Comments are welcome. v2: references updated.
Matches with published version in JHEP | JHEP 09 (2023) 085 | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In standard cosmological scenarios, a heavy meta-stable field dominates the
energy density of the universe after inflation. The dissipation of this field
continuously sources high-energy particles. In general, the dissipation rate of
this meta-stable field can have a non-trivial time dependence. We study the
impact of this time-dependent dissipation rate on the thermalization of the
high-energy decay products of the meta-stable field. These energetic particles
can contribute substantially to dark matter production in addition to the usual
production from the thermal bath particles during reheating. We investigate the
impact of this generalized dissipation on dark matter production in a
model-independent way. We illustrate the parameter space that explains the
observed dark matter relic abundance in various cosmological scenarios. We
observed that dark matter having a mass larger than the maximum temperature
attained by the thermal bath can be produced from the collision of the
high-energy particles which are not yet thermalized.
| [
{
"created": "Mon, 13 Feb 2023 19:35:21 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2023 18:09:27 GMT",
"version": "v2"
}
] | 2023-10-20 | [
[
"Chowdhury",
"Debtosh",
""
],
[
"Hait",
"Arpan",
""
]
] | In standard cosmological scenarios, a heavy meta-stable field dominates the energy density of the universe after inflation. The dissipation of this field continuously sources high-energy particles. In general, the dissipation rate of this meta-stable field can have a non-trivial time dependence. We study the impact of this time-dependent dissipation rate on the thermalization of the high-energy decay products of the meta-stable field. These energetic particles can contribute substantially to dark matter production in addition to the usual production from the thermal bath particles during reheating. We investigate the impact of this generalized dissipation on dark matter production in a model-independent way. We illustrate the parameter space that explains the observed dark matter relic abundance in various cosmological scenarios. We observed that dark matter having a mass larger than the maximum temperature attained by the thermal bath can be produced from the collision of the high-energy particles which are not yet thermalized. |
hep-ph/0002064 | Hitoshi Murayama | Andre de Gouvea (CERN), Alexander Friedland, and Hitoshi Murayama (UC
Berkeley, LBNL) | The Dark Side of the Solar Neutrino Parameter Space | 4 pages, 3 figures, uses psfig. Fixed typos in Eq. (3). An imprecise
comment in the footnote removed | Phys.Lett.B490:125-130,2000 | 10.1016/S0370-2693(00)00989-8 | UCB-PTH-00/03, LBNL-45023 | hep-ph astro-ph hep-ex nucl-ex nucl-th | null | Results of neutrino oscillation experiments have always been presented on the
(sin^2 2theta, Delta m^2) parameter space for the case of two-flavor
oscillations. We point out, however, that this parameterization misses the half
of the parameter space pi/4 < theta <= pi/2 (``the dark side''), which is
physically inequivalent to the region 0 <= theta <= pi/4 (``the light side'')
in the presence of matter effects. The MSW solutions to the solar neutrino
problem can extend to the dark side, especially if we take the conservative
attitude to allow higher confidence levels, ignore some of the experimental
results in the fits, or relax theoretical predictions. Furthermore even the
so-called ``vacuum oscillation'' solution distinguishes the dark and the light
sides. We urge experimental collaborations to present their results on the
entire parameter space.
| [
{
"created": "Mon, 7 Feb 2000 17:12:55 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Feb 2000 05:19:38 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"de Gouvea",
"Andre",
"",
"CERN"
],
[
"Friedland",
"Alexander",
"",
"UC\n Berkeley, LBNL"
],
[
"Murayama",
"Hitoshi",
"",
"UC\n Berkeley, LBNL"
]
] | Results of neutrino oscillation experiments have always been presented on the (sin^2 2theta, Delta m^2) parameter space for the case of two-flavor oscillations. We point out, however, that this parameterization misses the half of the parameter space pi/4 < theta <= pi/2 (``the dark side''), which is physically inequivalent to the region 0 <= theta <= pi/4 (``the light side'') in the presence of matter effects. The MSW solutions to the solar neutrino problem can extend to the dark side, especially if we take the conservative attitude to allow higher confidence levels, ignore some of the experimental results in the fits, or relax theoretical predictions. Furthermore even the so-called ``vacuum oscillation'' solution distinguishes the dark and the light sides. We urge experimental collaborations to present their results on the entire parameter space. |
1005.1674 | Hale Sert | Hale Sert, Elif Cincioglu, Durmus A. Demir and Levent Solmaz | Tevatron Higgs Mass Bounds: Projecting U(1)' Models to LHC Domain | 11 pages, 3 figures | Phys.Lett.B692:327-335,2010 | 10.1016/j.physletb.2010.08.007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Higgs boson masses in supersymmetric models with an extra U(1)
symmetry to be called U(1)$^{\prime}$. Such extra gauge symmetries are urged by
the $\mu$ problem of the MSSM, and they also arise frequently in low-energy
supersymmetric models stemming from GUTs and strings. We analyze mass of the
lightest Higgs boson and various other particle masses and couplings by taking
into account the LEP bounds as well as the recent bounds from Tevatron
experiments. We find that the $\mu$-problem motivated generic low-energy
U(1)$^{\prime}$ model yields Higgs masses as large as $\sim 200\ {\rm GeV}$ and
violate the Tevatron bounds for certain ranges of parameters. We analyze
correlations among various model parameters, and determine excluded regions by
both scanning the parameter space and by examining certain likely parameter
values. We also make educated projections for LHC measurements in light of the
Tevatron restrictions on the parameter space. We further analyze certain
benchmark models stemming from E(6) breaking, and find that they elevate Higgs
boson mass into Tevatron's forbidden band when U(1)$^{\prime}$ gauge coupling
takes larger values than the one corresponding to one-step GUT breaking.
| [
{
"created": "Mon, 10 May 2010 21:20:12 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Sert",
"Hale",
""
],
[
"Cincioglu",
"Elif",
""
],
[
"Demir",
"Durmus A.",
""
],
[
"Solmaz",
"Levent",
""
]
] | We study Higgs boson masses in supersymmetric models with an extra U(1) symmetry to be called U(1)$^{\prime}$. Such extra gauge symmetries are urged by the $\mu$ problem of the MSSM, and they also arise frequently in low-energy supersymmetric models stemming from GUTs and strings. We analyze mass of the lightest Higgs boson and various other particle masses and couplings by taking into account the LEP bounds as well as the recent bounds from Tevatron experiments. We find that the $\mu$-problem motivated generic low-energy U(1)$^{\prime}$ model yields Higgs masses as large as $\sim 200\ {\rm GeV}$ and violate the Tevatron bounds for certain ranges of parameters. We analyze correlations among various model parameters, and determine excluded regions by both scanning the parameter space and by examining certain likely parameter values. We also make educated projections for LHC measurements in light of the Tevatron restrictions on the parameter space. We further analyze certain benchmark models stemming from E(6) breaking, and find that they elevate Higgs boson mass into Tevatron's forbidden band when U(1)$^{\prime}$ gauge coupling takes larger values than the one corresponding to one-step GUT breaking. |
0902.1990 | Nathaniel Craig | Nathaniel J. Craig | Gravitational Waves from Supersymmetry Breaking | 4 pages, 2 figures | null | null | SU-ITP-09/08 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In theories of supersymmetry breaking, it is often the case that there is
more than one metastable vacuum. First-order phase transitions among such
metastable vacua may generate a stochastic background of gravitational waves,
the observation of which would provide a direct window into the
supersymmetry-breaking sector.
| [
{
"created": "Wed, 11 Feb 2009 21:06:31 GMT",
"version": "v1"
}
] | 2009-02-18 | [
[
"Craig",
"Nathaniel J.",
""
]
] | In theories of supersymmetry breaking, it is often the case that there is more than one metastable vacuum. First-order phase transitions among such metastable vacua may generate a stochastic background of gravitational waves, the observation of which would provide a direct window into the supersymmetry-breaking sector. |
1505.06121 | Renato Fonseca | Renato M. Fonseca and Martin Hirsch | SU(5)-inspired double beta decay | Small changes made; matches the published version in Physical Review
D | Phys. Rev. D 92, 015014 (2015) | 10.1103/PhysRevD.92.015014 | IFIC/15-30 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The short-range part of the neutrinoless double beta amplitude is generated
via the exchange of exotic particles, such as charged scalars, leptoquarks
and/or diquarks. In order to give a sizeable contribution to the total decay
rate, the masses of these exotics should be of the order of (at most) a few
TeV. Here, we argue that these exotics could be the "light" (i.e weak-scale)
remnants of some $B-L$ violating variants of $SU(5)$. We show that unification
of the standard model gauge couplings, consistent with proton decay limits, can
be achieved in such a setup without the need to introduce supersymmetry. Since
these non-minimal $SU(5)$-inspired models violate $B-L$, they generate Majorana
neutrino masses and therefore make it possible to explain neutrino oscillation
data. The "light" coloured particles of these models can potentially be
observed at the LHC, and it might be possible to probe the origin of the
neutrino masses with $\Delta L=2$ violating signals. As particular realizations
of this idea, we present two models, one for each of the two possible
tree-level topologies of neutrinoless double beta decay.
| [
{
"created": "Fri, 22 May 2015 15:24:28 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2015 15:35:28 GMT",
"version": "v2"
}
] | 2015-07-24 | [
[
"Fonseca",
"Renato M.",
""
],
[
"Hirsch",
"Martin",
""
]
] | The short-range part of the neutrinoless double beta amplitude is generated via the exchange of exotic particles, such as charged scalars, leptoquarks and/or diquarks. In order to give a sizeable contribution to the total decay rate, the masses of these exotics should be of the order of (at most) a few TeV. Here, we argue that these exotics could be the "light" (i.e weak-scale) remnants of some $B-L$ violating variants of $SU(5)$. We show that unification of the standard model gauge couplings, consistent with proton decay limits, can be achieved in such a setup without the need to introduce supersymmetry. Since these non-minimal $SU(5)$-inspired models violate $B-L$, they generate Majorana neutrino masses and therefore make it possible to explain neutrino oscillation data. The "light" coloured particles of these models can potentially be observed at the LHC, and it might be possible to probe the origin of the neutrino masses with $\Delta L=2$ violating signals. As particular realizations of this idea, we present two models, one for each of the two possible tree-level topologies of neutrinoless double beta decay. |
1907.03414 | Shuntaro Sakai | Shuntaro Sakai, Hao-Jie Jing, Feng-Kun Guo | Decays of $P_c$ into $J/\psi N$ and $\eta_cN$ with heavy quark spin
symmetry | 24 pages, 2 figures | Phys. Rev. D 100, 074007 (2019) | 10.1103/PhysRevD.100.074007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the consequences of heavy quark spin symmetry (HQSS) on
hidden-charm pentaquark $P_c$ states. As has been proposed before, assuming the
$P_c(4440)$ and the $P_c(4457)$ as $S$-wave $\bar{D}^*\Sigma_c$ molecules,
seven hadronic molecular states composed of $\bar{D}\Sigma_c$,
$\bar{D}\Sigma_c^*$, $\bar{D}^*\Sigma_c$, and $\bar{D}^*\Sigma_c^*$ can be
obtained, with the $\bar{D}\Sigma_c$ molecule corresponding to the $P_c(4312)$.
These seven states can decay into $J/\psi N$ and $\eta_c N$, and we use HQSS to
predict ratios of partial widths of the $S$-wave decays. For the decays into
$J/\psi N$, it is found that among all six $P_c$ molecules with spin $1/2$ or
$3/2$, at least four states decay much more easily into the $J/\psi N$ than the
$P_c(4312)$, and two of them couple dominantly to the $\bar D^*\Sigma_c^*$.
While no significant peak around the $\bar{D}^*\Sigma_c^*$ threshold is found
in the $J/\psi p$ distribution, these higher $P_c$ states either are produced
with lower rates or some special production mechanism for the observed $P_c$
states might play an important role, such as an intricate interplay between the
production of pentaquarks and triangle singularities.
| [
{
"created": "Mon, 8 Jul 2019 06:05:15 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 2019 03:01:45 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Sakai",
"Shuntaro",
""
],
[
"Jing",
"Hao-Jie",
""
],
[
"Guo",
"Feng-Kun",
""
]
] | We investigate the consequences of heavy quark spin symmetry (HQSS) on hidden-charm pentaquark $P_c$ states. As has been proposed before, assuming the $P_c(4440)$ and the $P_c(4457)$ as $S$-wave $\bar{D}^*\Sigma_c$ molecules, seven hadronic molecular states composed of $\bar{D}\Sigma_c$, $\bar{D}\Sigma_c^*$, $\bar{D}^*\Sigma_c$, and $\bar{D}^*\Sigma_c^*$ can be obtained, with the $\bar{D}\Sigma_c$ molecule corresponding to the $P_c(4312)$. These seven states can decay into $J/\psi N$ and $\eta_c N$, and we use HQSS to predict ratios of partial widths of the $S$-wave decays. For the decays into $J/\psi N$, it is found that among all six $P_c$ molecules with spin $1/2$ or $3/2$, at least four states decay much more easily into the $J/\psi N$ than the $P_c(4312)$, and two of them couple dominantly to the $\bar D^*\Sigma_c^*$. While no significant peak around the $\bar{D}^*\Sigma_c^*$ threshold is found in the $J/\psi p$ distribution, these higher $P_c$ states either are produced with lower rates or some special production mechanism for the observed $P_c$ states might play an important role, such as an intricate interplay between the production of pentaquarks and triangle singularities. |
1710.02155 | Farinaldo Queiroz | Nicolao Fornengo, Antonio Masiero, Farinaldo S. Queiroz, Carlos E.
Yaguna | On the Role of Neutrinos Telescopes in the Search for Dark Matter
Annihilations in the Sun | 19 pages, 6 figures | null | 10.1088/1475-7516/2017/12/012 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of GeV neutrinos coming from the Sun would be an unmistakable
signal of dark matter. Current neutrino detectors have so far failed to detect
such a signal, however, and bounds from direct and indirect dark matter
searches may significantly restrict the possibility of observing it in future
experiments such as Hyper-Kamiokande or IceCube-Gen2. In this work, we assess
in the light of current data and of expected experimental sensitivities, the
prospects for the detection of a neutrino signal from dark matter annihilations
in the Sun. To be as general as possible, equilibrium between the capture and
the annihilation rates in the Sun is not assumed in our analysis; instead, the
dark matter scattering and annihilation cross sections are taken as free and
independent parameters. We consider capture via both spin-dependent and
spin-independent interactions, and annihilations into three representative
final states: $b\bar b$, $W^+W^-$, and $\tau^+\tau^-$. We find that when the
capture in the Sun is dominated by spin-independent interactions, current
direct detection bounds already preclude the observation of a neutrino signal
in future experiments. For capture via spin-dependent interactions, a strong
complementarity is observed, over most of the parameter space, between future
neutrino detectors and planned direct and indirect dark matter detection
experiments, such as PICO-500 and CTA. In this case, we also identify some
regions of the parameter space that can be probed, via the neutrino flux from
the Sun, only by future neutrino experiments.
| [
{
"created": "Thu, 5 Oct 2017 18:00:15 GMT",
"version": "v1"
}
] | 2017-12-20 | [
[
"Fornengo",
"Nicolao",
""
],
[
"Masiero",
"Antonio",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Yaguna",
"Carlos E.",
""
]
] | The observation of GeV neutrinos coming from the Sun would be an unmistakable signal of dark matter. Current neutrino detectors have so far failed to detect such a signal, however, and bounds from direct and indirect dark matter searches may significantly restrict the possibility of observing it in future experiments such as Hyper-Kamiokande or IceCube-Gen2. In this work, we assess in the light of current data and of expected experimental sensitivities, the prospects for the detection of a neutrino signal from dark matter annihilations in the Sun. To be as general as possible, equilibrium between the capture and the annihilation rates in the Sun is not assumed in our analysis; instead, the dark matter scattering and annihilation cross sections are taken as free and independent parameters. We consider capture via both spin-dependent and spin-independent interactions, and annihilations into three representative final states: $b\bar b$, $W^+W^-$, and $\tau^+\tau^-$. We find that when the capture in the Sun is dominated by spin-independent interactions, current direct detection bounds already preclude the observation of a neutrino signal in future experiments. For capture via spin-dependent interactions, a strong complementarity is observed, over most of the parameter space, between future neutrino detectors and planned direct and indirect dark matter detection experiments, such as PICO-500 and CTA. In this case, we also identify some regions of the parameter space that can be probed, via the neutrino flux from the Sun, only by future neutrino experiments. |
hep-ph/0309113 | Yue Chongxing | Chongxing Yue, Shunzhi Wang, Dongqi Yu | Littlest Higgs model and associated ZH production at high energy
$e^{+}e^{-}$ collider | 13 pages, 3 figures | Phys.Rev. D68 (2003) 115004 | 10.1103/PhysRevD.68.115004 | null | hep-ph | null | In the context of the littlest Higgs (LH) model, we consider the Higgs
strahlung process $e^{+}e^{-}\to ZH $. We find that the correction effects on
this process mainly come from the heavy photon $B'$. If we take the mixing
angle parameter $c$ in the range of 0.75 - 1, the contributions of the heavy
gauge boson $W_{3}'$ is larger than 6%. In most of the parameter space, the
deviation of the total production cross section $\sigma^{tot}$ from its SM
value is larger than 5%, which may be detected in the future high energy
$e^{+}e^{-}$ collider (LC) experiments. The future LC experiments could test
the LH model by measuring the cross section of the process $e^{+}e^{-}\to ZH $.
| [
{
"created": "Wed, 10 Sep 2003 18:01:12 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2003 09:24:26 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Yue",
"Chongxing",
""
],
[
"Wang",
"Shunzhi",
""
],
[
"Yu",
"Dongqi",
""
]
] | In the context of the littlest Higgs (LH) model, we consider the Higgs strahlung process $e^{+}e^{-}\to ZH $. We find that the correction effects on this process mainly come from the heavy photon $B'$. If we take the mixing angle parameter $c$ in the range of 0.75 - 1, the contributions of the heavy gauge boson $W_{3}'$ is larger than 6%. In most of the parameter space, the deviation of the total production cross section $\sigma^{tot}$ from its SM value is larger than 5%, which may be detected in the future high energy $e^{+}e^{-}$ collider (LC) experiments. The future LC experiments could test the LH model by measuring the cross section of the process $e^{+}e^{-}\to ZH $. |
2001.06449 | Renaud Boussarie | Renaud Boussarie, Yacine Mehtar-Tani | On gauge invariance of transverse momentum dependent distributions at
small x | 21 pages, 5 figures | Phys. Rev. D 103, 094012 (2021) | 10.1103/PhysRevD.103.094012 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interplay between the small x limit of QCD amplitudes and QCD
factorization at moderate x has been studied extensively in recent years. It
was finally shown that semiclassical formulations of small x physics can have
the form of an infinite twist framework involving Transverse Momentum Dependent
(TMD) distributions in the eikonal limit. In this work, we demonstrate that
small x distributions can be formulated in terms of transverse gauge links.
This allows in particular for direct and efficient decompositions of
observables into subamplitudes involving gauge invariant sub-operators which
span parton distributions.
| [
{
"created": "Fri, 17 Jan 2020 17:49:30 GMT",
"version": "v1"
}
] | 2021-05-19 | [
[
"Boussarie",
"Renaud",
""
],
[
"Mehtar-Tani",
"Yacine",
""
]
] | The interplay between the small x limit of QCD amplitudes and QCD factorization at moderate x has been studied extensively in recent years. It was finally shown that semiclassical formulations of small x physics can have the form of an infinite twist framework involving Transverse Momentum Dependent (TMD) distributions in the eikonal limit. In this work, we demonstrate that small x distributions can be formulated in terms of transverse gauge links. This allows in particular for direct and efficient decompositions of observables into subamplitudes involving gauge invariant sub-operators which span parton distributions. |
1507.06431 | Pasquale Di Bari | Pasquale Di Bari and Stephen F. King | Successful $N_2$ leptogenesis with flavour coupling effects in realistic
unified models | 26 pages, 1 figure; v2: typos corrected, Ref's added; v3: matches
JCAP published version | null | 10.1088/1475-7516/2015/10/008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In realistic unified models involving an $SO(10)$-like pattern of Dirac and
heavy right-handed (RH) neutrino masses, the lightest right-handed neutrino
$N_1$ is too light to yield successful thermal leptogenesis, barring highly
fine tuned solutions, while the second heaviest right-handed neutrino $N_2$ is
typically in the correct mass range. We show that flavour coupling effects in
the Boltzmann equations may be crucial to the success of such $N_2$ dominated
leptogenesis, by helping to ensure that the flavour asymmetries produced at the
$N_2$ scale survive $N_1$ washout. To illustrate these effects we focus on
$N_2$ dominated leptogenesis in an existing model, the A to Z of flavour with
Pati-Salam, where the neutrino Dirac mass matrix may be equal to an up-type
quark mass matrix and has a particular constrained structure. The numerical
results, supported by analytical insight, show that in order to achieve
successful $N_2$ leptogenesis, consistent with neutrino phenomenology, requires
a "flavour swap scenario" together with a less hierarchical pattern of RH
neutrino masses than naively expected, at the expense of some mild fine-tuning.
These results may be relevant for other $SO(10)$-like unified models where
$N_2$ leptogenesis is necessary.
| [
{
"created": "Thu, 23 Jul 2015 10:10:15 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 2015 19:31:09 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Oct 2015 15:38:24 GMT",
"version": "v3"
}
] | 2015-10-14 | [
[
"Di Bari",
"Pasquale",
""
],
[
"King",
"Stephen F.",
""
]
] | In realistic unified models involving an $SO(10)$-like pattern of Dirac and heavy right-handed (RH) neutrino masses, the lightest right-handed neutrino $N_1$ is too light to yield successful thermal leptogenesis, barring highly fine tuned solutions, while the second heaviest right-handed neutrino $N_2$ is typically in the correct mass range. We show that flavour coupling effects in the Boltzmann equations may be crucial to the success of such $N_2$ dominated leptogenesis, by helping to ensure that the flavour asymmetries produced at the $N_2$ scale survive $N_1$ washout. To illustrate these effects we focus on $N_2$ dominated leptogenesis in an existing model, the A to Z of flavour with Pati-Salam, where the neutrino Dirac mass matrix may be equal to an up-type quark mass matrix and has a particular constrained structure. The numerical results, supported by analytical insight, show that in order to achieve successful $N_2$ leptogenesis, consistent with neutrino phenomenology, requires a "flavour swap scenario" together with a less hierarchical pattern of RH neutrino masses than naively expected, at the expense of some mild fine-tuning. These results may be relevant for other $SO(10)$-like unified models where $N_2$ leptogenesis is necessary. |
1602.03401 | Marius Wiesemann | Marius Wiesemann | Transverse-momentum resummation of colorless final states at the
NNLL+NNLO | 12 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) | null | null | ZU-TH-6/16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general framework that allows to compute the resummed
transverse-momentum distribution of a system of colorless particles. The
implementation is fully differential in the degrees of freedom of the
final-state system. As a first application, we consider the transverse-momentum
spectrum of ZZ and WW boson pairs produced in hadron collisions, where we resum
the logarithmically enhanced contributions due to multiple soft-gluon emission
at small transverse momenta to all orders in perturbation theory. We exploit
the most advanced perturbative information for the ZZ and WW production
processes that is available at present by combining next-to-next-to-leading
order QCD corrections with next-to-next-to-leading logarithmic resummation.
| [
{
"created": "Wed, 10 Feb 2016 15:11:42 GMT",
"version": "v1"
}
] | 2016-02-11 | [
[
"Wiesemann",
"Marius",
""
]
] | We present a general framework that allows to compute the resummed transverse-momentum distribution of a system of colorless particles. The implementation is fully differential in the degrees of freedom of the final-state system. As a first application, we consider the transverse-momentum spectrum of ZZ and WW boson pairs produced in hadron collisions, where we resum the logarithmically enhanced contributions due to multiple soft-gluon emission at small transverse momenta to all orders in perturbation theory. We exploit the most advanced perturbative information for the ZZ and WW production processes that is available at present by combining next-to-next-to-leading order QCD corrections with next-to-next-to-leading logarithmic resummation. |
hep-ph/9908286 | Diego Restrepo | Marco A. Diaz, Diego A. Restrepo, Jose W. F. Valle | Two-Body Decays of the Lightest Stop in Supergravity with and without
R-Parity | Latex, 27 pages, including 11 figures. Version to be published in
Nucl. Phys. B | Nucl.Phys.B583:182-210,2000 | 10.1016/S0550-3213(00)00344-8 | FTUV/99-25,IFIC/99-27,FSU-HEP-990712,UCCHEP/10-00 | hep-ph | null | We study the decays of the lightest top squark in supergravity models with
and without R-parity. Using the simplest model with an effective explicit
bilinear breaking of R-parity and radiative electroweak symmetry breaking we
show that, below the threshold for decays into charginos $\tilde t_1\to
c\chi^+_1$, the lightest stop decays mainly into third generation fermions,
$\tilde t_1\to b\tau$ instead of the R-parity conserving mode $\tilde t_1\to
c\chi^0_1$, even for tiny tau--neutrino mass values. Moreover we show that,
even above the threshold for decays into charginos, the decay $\tilde t_1\to
b\tau$ may be dominant. We study the role played by the universality of the
boundary conditions on the soft supersymmetry breaking terms. This new decay
mode $\tilde t_1\to b\tau$ as well as the cascades originated by the
conventional $\tilde t_1\to c\chi^0_1$ decay followed by the R-parity violating
neutralino decays can provide new signatures for stop production at LEP and the
Tevatron.
| [
{
"created": "Fri, 6 Aug 1999 16:50:59 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2000 16:34:08 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Diaz",
"Marco A.",
""
],
[
"Restrepo",
"Diego A.",
""
],
[
"Valle",
"Jose W. F.",
""
]
] | We study the decays of the lightest top squark in supergravity models with and without R-parity. Using the simplest model with an effective explicit bilinear breaking of R-parity and radiative electroweak symmetry breaking we show that, below the threshold for decays into charginos $\tilde t_1\to c\chi^+_1$, the lightest stop decays mainly into third generation fermions, $\tilde t_1\to b\tau$ instead of the R-parity conserving mode $\tilde t_1\to c\chi^0_1$, even for tiny tau--neutrino mass values. Moreover we show that, even above the threshold for decays into charginos, the decay $\tilde t_1\to b\tau$ may be dominant. We study the role played by the universality of the boundary conditions on the soft supersymmetry breaking terms. This new decay mode $\tilde t_1\to b\tau$ as well as the cascades originated by the conventional $\tilde t_1\to c\chi^0_1$ decay followed by the R-parity violating neutralino decays can provide new signatures for stop production at LEP and the Tevatron. |
1702.02524 | David Curtin | David Curtin, Raman Sundrum | Flashes of Hidden Worlds at Colliders | Comment: 7 pages, 5 figures. Submitted to Physics Today. Shortened
second section, added discussion on collider searches, added references | Physics Today, June 2017, page 46 | 10.1063/PT.3.3594 | null | hep-ph astro-ph.CO hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | (This is a general physics level overview article about hidden sectors, and
how they motivate searches for long-lived particles. Intended for publication
in Physics Today.)
Searches for new physics at the Large Hadron Collider have so far come up
empty, but we just might not be looking in the right place. Spectacular bursts
of particles appearing seemingly out of nowhere could shed light on some of
nature's most profound mysteries.
| [
{
"created": "Wed, 8 Feb 2017 17:04:48 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 14:17:28 GMT",
"version": "v2"
}
] | 2017-06-15 | [
[
"Curtin",
"David",
""
],
[
"Sundrum",
"Raman",
""
]
] | (This is a general physics level overview article about hidden sectors, and how they motivate searches for long-lived particles. Intended for publication in Physics Today.) Searches for new physics at the Large Hadron Collider have so far come up empty, but we just might not be looking in the right place. Spectacular bursts of particles appearing seemingly out of nowhere could shed light on some of nature's most profound mysteries. |
hep-ph/0303078 | Sandhya Choubey | Biswajoy Brahmachari, Sandhya Choubey, Probir Roy | CP violation and matter effect for a variable earth density in very long
baseline experiments | Version to appear in Nucl. Phys. B | Nucl.Phys. B671 (2003) 483-497 | 10.1016/j.nuclphysb.2003.08.009 | null | hep-ph hep-ex | null | The perturbative treatment of subdominant oscillation and the matter effect
in neutrino beams/superbeams, propagating over long baselines and being used to
look for CP violation, is studied here for a general matter density function
varying with distance. New lowest order analytic expressions are given for
different flavour transition and survival probabilities in a general neutrino
mixing basis and a variable earth matter density profile. It is demonstrated
that the matter effect in the muon neutrino (antineutrino) flavour survival
probability vanishes to this order, provided the depletion, observed for
atmospheric muon neutrinos and antineutrinos at super-Kamiokande, is strictly
maximal. This result is independent of the earth density profile and the
distance L between the source and the detector. In the general variable density
case we show that one cannot separate the matter induced asymmetry from a
genuine CP effect by keeping two detectors at distances $L_1$ and $L_2$ from
the source while maintaining a fixed ratio $L_1/E_1 = L_2/E_2$. This needs to
be done numerically and we estimate the asymmetry generated by the earth matter
effect with particular density profiles and some chosen parameters for very
long baseline neutrino oscillation experiments.
| [
{
"created": "Mon, 10 Mar 2003 15:31:15 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2003 15:24:03 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Aug 2003 14:19:49 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Brahmachari",
"Biswajoy",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Roy",
"Probir",
""
]
] | The perturbative treatment of subdominant oscillation and the matter effect in neutrino beams/superbeams, propagating over long baselines and being used to look for CP violation, is studied here for a general matter density function varying with distance. New lowest order analytic expressions are given for different flavour transition and survival probabilities in a general neutrino mixing basis and a variable earth matter density profile. It is demonstrated that the matter effect in the muon neutrino (antineutrino) flavour survival probability vanishes to this order, provided the depletion, observed for atmospheric muon neutrinos and antineutrinos at super-Kamiokande, is strictly maximal. This result is independent of the earth density profile and the distance L between the source and the detector. In the general variable density case we show that one cannot separate the matter induced asymmetry from a genuine CP effect by keeping two detectors at distances $L_1$ and $L_2$ from the source while maintaining a fixed ratio $L_1/E_1 = L_2/E_2$. This needs to be done numerically and we estimate the asymmetry generated by the earth matter effect with particular density profiles and some chosen parameters for very long baseline neutrino oscillation experiments. |
1911.11706 | Feng Yuan | Yoshitaka Hatta (BNL), Mark Strikman (PSU), Ji Xu (SJTU), Feng Yuan
(LBNL) | Sub-threshold $J/\psi$ and $\Upsilon$ Production in $\gamma A$
Collisions | 7 pages, 5 figures | null | 10.1016/j.physletb.2020.135321 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study sub-threshold heavy quarkonium ($J/\psi$ and $\Upsilon$)
photo-productions in $\gamma A$ collisions as an independent test of the
universality of the nucleon-nucleon short range correlation (SRC) in nuclear
scattering processes. Just below the $\gamma p$ threshold, the cross section is
dominated by the mean field contribution of nucleons inside the nucleus. The
SRC contributions start to dominate at lower photon energies, depending on the
fraction of the SRC pairs in the target nucleus. We give an estimate of the
cross sections in the sub-threshold region both for $J/\psi$ and $\Upsilon$.
This may be helpful for future measurements at JLab as well as at the
Electron-Ion Collider in the U.S., and especially in China.
| [
{
"created": "Tue, 26 Nov 2019 17:20:48 GMT",
"version": "v1"
}
] | 2020-02-26 | [
[
"Hatta",
"Yoshitaka",
"",
"BNL"
],
[
"Strikman",
"Mark",
"",
"PSU"
],
[
"Xu",
"Ji",
"",
"SJTU"
],
[
"Yuan",
"Feng",
"",
"LBNL"
]
] | We study sub-threshold heavy quarkonium ($J/\psi$ and $\Upsilon$) photo-productions in $\gamma A$ collisions as an independent test of the universality of the nucleon-nucleon short range correlation (SRC) in nuclear scattering processes. Just below the $\gamma p$ threshold, the cross section is dominated by the mean field contribution of nucleons inside the nucleus. The SRC contributions start to dominate at lower photon energies, depending on the fraction of the SRC pairs in the target nucleus. We give an estimate of the cross sections in the sub-threshold region both for $J/\psi$ and $\Upsilon$. This may be helpful for future measurements at JLab as well as at the Electron-Ion Collider in the U.S., and especially in China. |
hep-ph/9405289 | Thomas Meissner | Th.Meissner | The Convergence Radius of the Chiral Expansion in the Dyson-Schwinger
Approach | 12 pages (REVTEX) + 4 postscript figures (uuencoded tar-compressed),
DOE/ER/40561-140INT94-00-01 | Phys.Lett. B340 (1994) 226-230 | 10.1016/0370-2693(94)01307-1 | null | hep-ph nucl-th | null | We determine the convergence radius $m_{conv}$ for the expansion in the
current quark mass using the Dyson-Schwinger (DS) equation of QCD in the
rainbow approximation. Within a Gaussian form for the gluon propagator
$D_{\mu\nu} ({\bf p}) \sim \delta_{\mu\nu} \chi^2 e^{- {{p^2} \over \Delta}}$
we find that $m_{conv}$ increases with decreasing width $\Delta$ and increasing
strength $\chi^2$. For those values of $\chi^2$ and $\Delta$, which provide the
best known description of low energy hadronic phenomena, $m_{conv}$ lies around
$2 \Lambda_{QCD}$, which is big enough, that the chiral expansion in the
strange sector converges. Our analysis also explains the rather low value of
$m_{conv} \approx 50 \dots 80 \ {\text MeV}$ in the Nambu--Jona-Lasinio model,
which as itself can be regarded as a special case of the rainbow DS models,
where the gluon propagator is a constant in momentum space.
| [
{
"created": "Sat, 14 May 1994 00:21:13 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Meissner",
"Th.",
""
]
] | We determine the convergence radius $m_{conv}$ for the expansion in the current quark mass using the Dyson-Schwinger (DS) equation of QCD in the rainbow approximation. Within a Gaussian form for the gluon propagator $D_{\mu\nu} ({\bf p}) \sim \delta_{\mu\nu} \chi^2 e^{- {{p^2} \over \Delta}}$ we find that $m_{conv}$ increases with decreasing width $\Delta$ and increasing strength $\chi^2$. For those values of $\chi^2$ and $\Delta$, which provide the best known description of low energy hadronic phenomena, $m_{conv}$ lies around $2 \Lambda_{QCD}$, which is big enough, that the chiral expansion in the strange sector converges. Our analysis also explains the rather low value of $m_{conv} \approx 50 \dots 80 \ {\text MeV}$ in the Nambu--Jona-Lasinio model, which as itself can be regarded as a special case of the rainbow DS models, where the gluon propagator is a constant in momentum space. |
hep-ph/9406272 | Andrzej J. Buras | A.J. Buras | CP Violation: Present and Future | 26 Pages, MPI-PhT/94-30, TUM-T31-64/94, Latex file, figures not
included | null | null | null | hep-ph | null | We review the present status of CP violation in the standard model.
Subsequently we make an excursion in the future in order to see what we could
expect in this field in this and the next decade. We present various strategies
for the determination of the CKM parameters and divide the decays into four
classes with respect to theoretical uncertainties. We emphasize that the
definitive tests of the Kobayashi-Maskawa picture of CP violation will come
through a {\it simultaneous} study of CP asymmetries in $B_{d,s}^o$ decays, the
rare decays $K^+ \to \pi^+\nu \bar\nu$ and $K_L \to \pi^o\nu\bar\nu$, and
$x_d/x_s$. We illustrate how the measurements of the CP asymmetries in
$B^0_{d,s}$-decays together with a measurement of $Br(K_L\to
\pi^\circ\nu\bar\nu)$ or $Br(\kpnn)$ and the known value of $\mid V_{us}\mid $
can determine {\it all} elements of the Cabibbo-Kobayashi-Maskawa matrix
essentially without any hadronic uncertainties.
| [
{
"created": "Fri, 10 Jun 1994 07:48:05 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Buras",
"A. J.",
""
]
] | We review the present status of CP violation in the standard model. Subsequently we make an excursion in the future in order to see what we could expect in this field in this and the next decade. We present various strategies for the determination of the CKM parameters and divide the decays into four classes with respect to theoretical uncertainties. We emphasize that the definitive tests of the Kobayashi-Maskawa picture of CP violation will come through a {\it simultaneous} study of CP asymmetries in $B_{d,s}^o$ decays, the rare decays $K^+ \to \pi^+\nu \bar\nu$ and $K_L \to \pi^o\nu\bar\nu$, and $x_d/x_s$. We illustrate how the measurements of the CP asymmetries in $B^0_{d,s}$-decays together with a measurement of $Br(K_L\to \pi^\circ\nu\bar\nu)$ or $Br(\kpnn)$ and the known value of $\mid V_{us}\mid $ can determine {\it all} elements of the Cabibbo-Kobayashi-Maskawa matrix essentially without any hadronic uncertainties. |
1206.3454 | Ignasi Rosell | Antonio Pich, Ignasi Rosell and Juan Jose Sanz-Cillero | One-Loop Calculation of the Oblique S Parameter in Higgsless Electroweak
Models | 34 pages, 9 figures. Version published in JHEP. Some references and
sentences have been added to facilitate the discussion | null | 10.1007/JHEP08(2012)106 | BARI-TH/2012-653; FTUV/12-0615; IFIC/12-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a one-loop calculation of the oblique S parameter within Higgsless
models of electroweak symmetry breaking and analyze the phenomenological
implications of the available electroweak precision data. We use the most
general effective Lagrangian with at most two derivatives, implementing the
chiral symmetry breaking SU(2)_L x SU(2)_R -> SU(2)_{L+R} with Goldstones,
gauge bosons and one multiplet of vector and axial-vector massive resonance
states. Using the dispersive representation of Peskin and Takeuchi and imposing
the short-distance constraints dictated by the operator product expansion, we
obtain S at the NLO in terms of a few resonance parameters. In
asymptotically-free gauge theories, the final result only depends on the
vector-resonance mass and requires M_V > 1.8 TeV (3.8 TeV) to satisfy the
experimental limits at the 3 \sigma (1\sigma) level; the axial state is always
heavier, we obtain M_A > 2.5 TeV (6.6 TeV) at 3\sigma (1\sigma). In
strongly-coupled models, such as walking or conformal technicolour, where the
second Weinberg sum rule does not apply, the vector and axial couplings are not
determined by the short-distance constraints; but one can still derive a lower
bound on S, provided the hierarchy M_V < M_A remains valid. Even in this less
constrained situation, we find that in order to satisfy the experimental limits
at 3\sigma one needs M_{V,A} > 1.8 TeV.
| [
{
"created": "Fri, 15 Jun 2012 13:12:29 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2012 11:24:14 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Pich",
"Antonio",
""
],
[
"Rosell",
"Ignasi",
""
],
[
"Sanz-Cillero",
"Juan Jose",
""
]
] | We present a one-loop calculation of the oblique S parameter within Higgsless models of electroweak symmetry breaking and analyze the phenomenological implications of the available electroweak precision data. We use the most general effective Lagrangian with at most two derivatives, implementing the chiral symmetry breaking SU(2)_L x SU(2)_R -> SU(2)_{L+R} with Goldstones, gauge bosons and one multiplet of vector and axial-vector massive resonance states. Using the dispersive representation of Peskin and Takeuchi and imposing the short-distance constraints dictated by the operator product expansion, we obtain S at the NLO in terms of a few resonance parameters. In asymptotically-free gauge theories, the final result only depends on the vector-resonance mass and requires M_V > 1.8 TeV (3.8 TeV) to satisfy the experimental limits at the 3 \sigma (1\sigma) level; the axial state is always heavier, we obtain M_A > 2.5 TeV (6.6 TeV) at 3\sigma (1\sigma). In strongly-coupled models, such as walking or conformal technicolour, where the second Weinberg sum rule does not apply, the vector and axial couplings are not determined by the short-distance constraints; but one can still derive a lower bound on S, provided the hierarchy M_V < M_A remains valid. Even in this less constrained situation, we find that in order to satisfy the experimental limits at 3\sigma one needs M_{V,A} > 1.8 TeV. |
hep-ph/0009054 | Piotr Zenczykowski | P. Zenczykowski (Institute of Nuclear Physics, Krakow, Poland) | Contribution of Inelastic Rescatterring to $B \to \pi \pi, K \bar{K}$
Decays | 25 LaTeX pages, 6 figures in one .ps file | Phys.Rev. D63 (2001) 014016 | 10.1103/PhysRevD.63.014016 | 1849/PH | hep-ph | null | We discuss multichannel inelastic rescatterring effects in B decays into a
pair $PP$ of pseudoscalar mesons ($PP = \pi \pi$ or $K\bar{K}$). In agreement
with short-distance models it is assumed that initially $B$ meson decays
dominantly into jet-like states composed of two flying-apart low-mass
resonances $M_1 M_2$ which rescatter into $PP$. Since from all S-matrix
elements $<i|S|PP>$ involving $PP$ only some ($i = M_1 M_2$) contribute to the
final state rescatterring, the latter is treated as a correction only. The
rescatterring of resonance pair $M_1 M_2$ into the final $PP$ state is assumed
to proceed through Regge exchange. Although effects due to a single
intermediate state $M_1 M_2$ are small, it is shown that the combined effect of
all such states should be large. In particular, amplitudes of B decays into
$K\bar{K}$ become significantly larger than those estimated through
short-distance penguin diagrams, to the point of being comparable to the $B\to
\pi \pi$ amplitudes.
| [
{
"created": "Tue, 5 Sep 2000 13:47:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Zenczykowski",
"P.",
"",
"Institute of Nuclear Physics, Krakow, Poland"
]
] | We discuss multichannel inelastic rescatterring effects in B decays into a pair $PP$ of pseudoscalar mesons ($PP = \pi \pi$ or $K\bar{K}$). In agreement with short-distance models it is assumed that initially $B$ meson decays dominantly into jet-like states composed of two flying-apart low-mass resonances $M_1 M_2$ which rescatter into $PP$. Since from all S-matrix elements $<i|S|PP>$ involving $PP$ only some ($i = M_1 M_2$) contribute to the final state rescatterring, the latter is treated as a correction only. The rescatterring of resonance pair $M_1 M_2$ into the final $PP$ state is assumed to proceed through Regge exchange. Although effects due to a single intermediate state $M_1 M_2$ are small, it is shown that the combined effect of all such states should be large. In particular, amplitudes of B decays into $K\bar{K}$ become significantly larger than those estimated through short-distance penguin diagrams, to the point of being comparable to the $B\to \pi \pi$ amplitudes. |
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