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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1711.10623 | Wei-Hong Liang | Wei-Hong Liang, J. M. Dias, V. R. Debastiani, E. Oset | Molecular $\Omega_b$ states | 11 pages, 9 tables; v2: discussion added, version accepted for
publication in NPB | Nucl. Phys. B 930, 524 (2018) | 10.1016/j.nuclphysb.2018.03.008 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent finding of five $\Omega_c$ states by the LHCb
collaboration, and the successful reproduction of three of them in a recent
approach searching for molecular states of meson-baryon with the quantum
numbers of $\Omega_c$, we extend these ideas and make predictions for the
interaction of meson-baryon in the beauty sector, searching for poles in the
scattering matrix that correspond to physical states. We find several
$\Omega_b$ states: two states with masses 6405~MeV and 6465~MeV for $J^P=
\frac{1}{2}^-$; two more states with masses 6427~MeV and 6665~MeV for
$\frac{3}{2}^-$; and three states between 6500 and 6820~MeV, degenerate with
$J^P=\frac{1}{2}^-,\,\frac{3}{2}^-$, stemming from the interaction of
vector-baryon in the beauty sector.
| [
{
"created": "Wed, 29 Nov 2017 00:05:27 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2018 14:02:51 GMT",
"version": "v2"
}
] | 2018-05-11 | [
[
"Liang",
"Wei-Hong",
""
],
[
"Dias",
"J. M.",
""
],
[
"Debastiani",
"V. R.",
""
],
[
"Oset",
"E.",
""
]
] | Motivated by the recent finding of five $\Omega_c$ states by the LHCb collaboration, and the successful reproduction of three of them in a recent approach searching for molecular states of meson-baryon with the quantum numbers of $\Omega_c$, we extend these ideas and make predictions for the interaction of meson-baryon in the beauty sector, searching for poles in the scattering matrix that correspond to physical states. We find several $\Omega_b$ states: two states with masses 6405~MeV and 6465~MeV for $J^P= \frac{1}{2}^-$; two more states with masses 6427~MeV and 6665~MeV for $\frac{3}{2}^-$; and three states between 6500 and 6820~MeV, degenerate with $J^P=\frac{1}{2}^-,\,\frac{3}{2}^-$, stemming from the interaction of vector-baryon in the beauty sector. |
1005.2984 | Roman Ryutin Dr | A.E. Sobol, R.A. Ryutin, V.A. Petrov and M. Murray | Elastic $\pi^{+}p$ and $\pi^{+}\pi^{+}$ scattering at LHC | 26 pages, 25 figures, to be published, minor text corrections | Eur.Phys.J.C69:641-655,2010 | 10.1140/epjc/s10052-010-1426-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the possibility of measuring leading neutron production at the
LHC. These data could be used to extract from it $\pi^+ p$ and $\pi^+\pi^+$
cross-sections. In this note we give some estimates for the case of elastic
cross-sections and discuss related problems and prospects.
| [
{
"created": "Mon, 17 May 2010 17:29:55 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2010 14:06:36 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Sobol",
"A. E.",
""
],
[
"Ryutin",
"R. A.",
""
],
[
"Petrov",
"V. A.",
""
],
[
"Murray",
"M.",
""
]
] | We discuss the possibility of measuring leading neutron production at the LHC. These data could be used to extract from it $\pi^+ p$ and $\pi^+\pi^+$ cross-sections. In this note we give some estimates for the case of elastic cross-sections and discuss related problems and prospects. |
2303.04542 | Fu-Lai Wang | Fu-Lai Wang, Si-Qiang Luo, and Xiang Liu | Radiative decays and magnetic moments of the predicted $B_c$-like
molecules | 13 pages, 8 tables, 1 figure | Phys. Rev. D 107,114017(2023) | 10.1103/PhysRevD.107.114017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we first perform a systematic study of the transition magnetic
moments and the corresponding radiative decay behaviors of the $B_c$-like
molecular states associated with their mass spectra, where the constituent
quark model is adopted by considering the $S$-$D$ wave mixing effect. Our
numerical results show that the radiative decay properties can be considered as
the effective physical observable to reflect the inner structures of these
$B_c$-like molecular states. Meanwhile, we also discuss the magnetic moments of
the $B_c$-like molecular states, and we find that the magnetic moment
properties can be used to distinguish the $B_c$-like molecular states from the
conventional $B_c$ mesonic states, which have the same quantum numbers and
similar masses. We expect that the present study can inspire the interest of
the experimentalist in exploring the electromagnetic properties of the
$B_c$-like molecular states, especially the radiative decay properties.
| [
{
"created": "Wed, 8 Mar 2023 12:38:31 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2023 09:30:39 GMT",
"version": "v2"
},
{
"created": "Mon, 29 May 2023 03:38:16 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Jun 2023 00:39:00 GMT",
"version": "v4"
}
] | 2023-06-16 | [
[
"Wang",
"Fu-Lai",
""
],
[
"Luo",
"Si-Qiang",
""
],
[
"Liu",
"Xiang",
""
]
] | In this work, we first perform a systematic study of the transition magnetic moments and the corresponding radiative decay behaviors of the $B_c$-like molecular states associated with their mass spectra, where the constituent quark model is adopted by considering the $S$-$D$ wave mixing effect. Our numerical results show that the radiative decay properties can be considered as the effective physical observable to reflect the inner structures of these $B_c$-like molecular states. Meanwhile, we also discuss the magnetic moments of the $B_c$-like molecular states, and we find that the magnetic moment properties can be used to distinguish the $B_c$-like molecular states from the conventional $B_c$ mesonic states, which have the same quantum numbers and similar masses. We expect that the present study can inspire the interest of the experimentalist in exploring the electromagnetic properties of the $B_c$-like molecular states, especially the radiative decay properties. |
1307.0013 | Simone Marzani | Mrinal Dasgupta, Alessandro Fregoso, Simone Marzani and Alexander
Powling | Jet substructure with analytical methods | 47 pages, 12 figures | Eur. Phys. J. C, 73 11 (2013) 2623 | 10.1140/epjc/s10052-013-2623-3 | DCPT/13/88, IPPP/13/44, MAN/HEP/2013/11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the mass distribution of QCD jets after the application of jet
substructure methods, specifically the mass-drop tagger, pruning, trimming and
their variants. In contrast to most current studies employing Monte Carlo
methods, we carry out analytical calculations at the next-to-leading order
level, which are sufficient to extract the dominant logarithmic behaviour for
each technique, and compare our findings to exact fixed-order results. Our
results should ultimately lead to a better understanding of these jet
substructure methods which in turn will influence the development of future
substructure tools for LHC phenomenology.
| [
{
"created": "Fri, 28 Jun 2013 20:00:12 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Oct 2013 17:53:39 GMT",
"version": "v2"
}
] | 2013-11-11 | [
[
"Dasgupta",
"Mrinal",
""
],
[
"Fregoso",
"Alessandro",
""
],
[
"Marzani",
"Simone",
""
],
[
"Powling",
"Alexander",
""
]
] | We consider the mass distribution of QCD jets after the application of jet substructure methods, specifically the mass-drop tagger, pruning, trimming and their variants. In contrast to most current studies employing Monte Carlo methods, we carry out analytical calculations at the next-to-leading order level, which are sufficient to extract the dominant logarithmic behaviour for each technique, and compare our findings to exact fixed-order results. Our results should ultimately lead to a better understanding of these jet substructure methods which in turn will influence the development of future substructure tools for LHC phenomenology. |
hep-ph/0506316 | Jin Zhu | Jin Zhu, Yue-Long Shen, Cai-Dian Lu | B_s \to \rho(\omega) K^* with Perturbative QCD approach | 16 pages, 5 figures | J.Phys.G32:101-110,2006 | 10.1088/0954-3899/32/2/004 | null | hep-ph hep-ex | null | $B_s \to \rho(\omega) K^{\ast}$ are useful to determine the $B_s$
distribution amplitude, as well as constrain the CKM phase angle $\alpha$. We
study these decays within the Perturbative QCD (PQCD) picture. In this
approach, we calculate factorizable, non-factorizable, as well as annihilation
diagrams. We find the branching ratio for $B_s \to \rho^+ K^{*-}$ is big to
order $10^{-5}$, we also find there's large direct CP violation in $B_s(\bar
B_s) \to \rho^0(\omega) \bar K^{*0}(K^{*0})$. Our predictions are consistent
with those from other methods and current experiments.
| [
{
"created": "Thu, 30 Jun 2005 08:50:36 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2005 04:40:45 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Zhu",
"Jin",
""
],
[
"Shen",
"Yue-Long",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | $B_s \to \rho(\omega) K^{\ast}$ are useful to determine the $B_s$ distribution amplitude, as well as constrain the CKM phase angle $\alpha$. We study these decays within the Perturbative QCD (PQCD) picture. In this approach, we calculate factorizable, non-factorizable, as well as annihilation diagrams. We find the branching ratio for $B_s \to \rho^+ K^{*-}$ is big to order $10^{-5}$, we also find there's large direct CP violation in $B_s(\bar B_s) \to \rho^0(\omega) \bar K^{*0}(K^{*0})$. Our predictions are consistent with those from other methods and current experiments. |
2305.05684 | Jury Radkovski I | Asher Berlin, Raffaele Tito D'Agnolo, Sebastian A. R. Ellis, Jury I.
Radkovski | Signals of Millicharged Dark Matter in Light-Shining-Through-Wall
Experiments | 17 pages, 4 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We discuss a novel detection technique for millicharged dark matter that
makes use of existing light-shining-through-wall (LSW) experiments searching
for massive dark photons. Since millicharged particles interact with both the
visible and dark sectors, a small background of such particles enables the
search for visible signals even in the limit of a massless dark photon.
Furthermore, for sufficiently large couplings, a small dark matter subcomponent
consisting of millicharged particles can have a terrestrial abundance that is
significantly enhanced with respect to its galactic abundance. We leverage this
fact to show that in certain parts of parameter space, future runs of the LSW
Dark SRF experiment can be used to set the strongest limits on millicharged
relics.
| [
{
"created": "Tue, 9 May 2023 18:00:01 GMT",
"version": "v1"
}
] | 2023-05-11 | [
[
"Berlin",
"Asher",
""
],
[
"D'Agnolo",
"Raffaele Tito",
""
],
[
"Ellis",
"Sebastian A. R.",
""
],
[
"Radkovski",
"Jury I.",
""
]
] | We discuss a novel detection technique for millicharged dark matter that makes use of existing light-shining-through-wall (LSW) experiments searching for massive dark photons. Since millicharged particles interact with both the visible and dark sectors, a small background of such particles enables the search for visible signals even in the limit of a massless dark photon. Furthermore, for sufficiently large couplings, a small dark matter subcomponent consisting of millicharged particles can have a terrestrial abundance that is significantly enhanced with respect to its galactic abundance. We leverage this fact to show that in certain parts of parameter space, future runs of the LSW Dark SRF experiment can be used to set the strongest limits on millicharged relics. |
hep-ph/0312297 | Naveen Gaur | Ashok Goyal (University of Delhi) | Mixed Phase in Compact Starts : M-R relations and radial oscillations | guest contribution at Int. Workshop on Astronomy & Relativistic
Astrophysics (IWARA 03)held at Olinda-PE (Brazil) from Oct. 12-17,2003 | Int.J.Mod.Phys. D13 (2004) 1197-1206 | 10.1142/S0218271804005316 | null | hep-ph | null | It is believed that quark stars or neutron stars with mixed phase in the core
have smaller radii compared to ordinary compact stars. With the recent
observation of several low radius objects, typically a radius of $<10 Km.$ for
star of mass $< 1M_0$ in low mass X-ray binaries (LMXB), it has become very
important to understand the nature of these objects. An accurate determination
of mass-radius relationship of these objects provide us with a physical
laboratory to study the composition of high density matter and the nature of
phase transition. We study the effect of quark and nuclear matter mixed phase
on mass radius relationship and radial oscillations of neutron stars. We find
that the effect of the mixed phase is to decrease the maximum mass of a stable
neutron star and to decrease the radial frequencies .
| [
{
"created": "Sat, 20 Dec 2003 13:13:35 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Goyal",
"Ashok",
"",
"University of Delhi"
]
] | It is believed that quark stars or neutron stars with mixed phase in the core have smaller radii compared to ordinary compact stars. With the recent observation of several low radius objects, typically a radius of $<10 Km.$ for star of mass $< 1M_0$ in low mass X-ray binaries (LMXB), it has become very important to understand the nature of these objects. An accurate determination of mass-radius relationship of these objects provide us with a physical laboratory to study the composition of high density matter and the nature of phase transition. We study the effect of quark and nuclear matter mixed phase on mass radius relationship and radial oscillations of neutron stars. We find that the effect of the mixed phase is to decrease the maximum mass of a stable neutron star and to decrease the radial frequencies . |
hep-ph/9602428 | Rohini Godbole | Rohini M. Godbole | Photon Structure Function | 14 pages, 6 postscript figures, latex, uses equation.sty and
epsfig.sty .sty files not added | null | null | CTS-TH-1/96 | hep-ph | null | After briefly explaining the idea of photon structure functions (\f2gam\ ,
\flgam) I review the current theoretical and experimental developements in the
subject of extraction of \qvph\ from a study of the Deep Inelastic Scattering
(DIS). I then end by pointing out recent progress in getting information about
the parton content of the photon from hard processes other than DIS.
| [
{
"created": "Thu, 29 Feb 1996 11:33:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Godbole",
"Rohini M.",
""
]
] | After briefly explaining the idea of photon structure functions (\f2gam\ , \flgam) I review the current theoretical and experimental developements in the subject of extraction of \qvph\ from a study of the Deep Inelastic Scattering (DIS). I then end by pointing out recent progress in getting information about the parton content of the photon from hard processes other than DIS. |
2204.02302 | Xu Sun | STAR Collaboration: M. S. Abdallah, B. E. Aboona, J. Adam, L.
Adamczyk, J. R. Adams, J. K. Adkins, G. Agakishiev, I. Aggarwal, M. M.
Aggarwal, Z. Ahammed, A. Aitbaev, I. Alekseev, D. M. Anderson, A. Aparin, E.
C. Aschenauer, M. U. Ashraf, F. G. Atetalla, G. S. Averichev, V. Bairathi, W.
Baker, J. G. Ball Cap, K. Barish, A. Behera, R. Bellwied, P. Bhagat, A.
Bhasin, J. Bielcik, J. Bielcikova, I. G. Bordyuzhin, J. D. Brandenburg, A. V.
Brandin, X. Z. Cai, H. Caines, M. Calder\'on de la Barca S\'anchez, D. Cebra,
I. Chakaberia, P. Chaloupka, B. K. Chan, F-H. Chang, Z. Chang, A. Chatterjee,
S. Chattopadhyay, D. Chen, J. Chen, J. H. Chen, X. Chen, Z. Chen, J. Cheng,
S. Choudhury, W. Christie, X. Chu, H. J. Crawford, M. Csan\'ad, M.
Daugherity, T. G. Dedovich, I. M. Deppner, A. A. Derevschikov, A. Dhamija, L.
Di Carlo, L. Didenko, P. Dixit, X. Dong, J. L. Drachenberg, E. Duckworth, J.
C. Dunlop, J. Engelage, G. Eppley, S. Esumi, O. Evdokimov, A. Ewigleben, O.
Eyser, R. Fatemi, F. M. Fawzi, S. Fazio, C. J. Feng, Y. Feng, E. Finch, Y.
Fisyak, A. Francisco, C. Fu, C. A. Gagliardi, T. Galatyuk, F. Geurts, N.
Ghimire, A. Gibson, K. Gopal, X. Gou, D. Grosnick, A. Gupta, W. Guryn, A.
Hamed, Y. Han, S. Harabasz, M. D. Harasty, J. W. Harris, H. Harrison, S. He,
W. He, X. H. He, Y. He, S. Heppelmann, N. Herrmann, E. Hoffman, L. Holub, C.
Hu, Q. Hu, Y. Hu, H. Huang, H. Z. Huang, S. L. Huang, T. Huang, X. Huang, Y.
Huang, T. J. Humanic, D. Isenhower, M. Isshiki, W. W. Jacobs, C. Jena, A.
Jentsch, Y. Ji, J. Jia, K. Jiang, X. Ju, E. G. Judd, S. Kabana, M. L. Kabir,
S. Kagamaster, D. Kalinkin, K. Kang, D. Kapukchyan, K. Kauder, H. W. Ke, D.
Keane, A. Kechechyan, M. Kelsey, D. P. Kiko{\l}a, B. Kimelman, D. Kincses, I.
Kisel, A. Kiselev, A. G. Knospe, H. S. Ko, L. Kochenda, A. Korobitsin, L. K.
Kosarzewski, L. Kramarik, P. Kravtsov, L. Kumar, S. Kumar, R. Kunnawalkam
Elayavalli, J. H. Kwasizur, R. Lacey, S. Lan, J. M. Landgraf, J. Lauret, A.
Lebedev, R. Lednicky, J. H. Lee, Y. H. Leung, N. Lewis, C. Li, C. Li, W. Li,
X. Li, Y. Li, X. Liang, Y. Liang, R. Licenik, T. Lin, Y. Lin, M. A. Lisa, F.
Liu, H. Liu, H. Liu, P. Liu, T. Liu, X. Liu, Y. Liu, Z. Liu, T. Ljubicic, W.
J. Llope, R. S. Longacre, E. Loyd, T. Lu, N. S. Lukow, X. F. Luo, L. Ma, R.
Ma, Y. G. Ma, N. Magdy, D. Mallick, S. L. Manukhov, S. Margetis, C. Markert,
H. S. Matis, J. A. Mazer, N. G. Minaev, S. Mioduszewski, B. Mohanty, M. M.
Mondal, I. Mooney, D. A. Morozov, A. Mukherjee, M. Nagy, J. D. Nam, Md.
Nasim, K. Nayak, D. Neff, J. M. Nelson, D. B. Nemes, M. Nie, G. Nigmatkulov,
T. Niida, R. Nishitani, L. V. Nogach, T. Nonaka, A. S. Nunes, G. Odyniec, A.
Ogawa, S. Oh, V. A. Okorokov, K. Okubo, B. S. Page, R. Pak, J. Pan, A.
Pandav, A. K. Pandey, Y. Panebratsev, P. Parfenov, A. Paul, B. Pawlik, D.
Pawlowska, C. Perkins, J. Pluta, B. R. Pokhrel, J. Porter, M. Posik, V.
Prozorova, N. K. Pruthi, M. Przybycien, J. Putschke, H. Qiu, A. Quintero, C.
Racz, S. K. Radhakrishnan, N. Raha, R. L. Ray, R. Reed, H. G. Ritter, M.
Robotkova, J. L. Romero, D. Roy, L. Ruan, A. K. Sahoo, N. R. Sahoo, H. Sako,
S. Salur, E. Samigullin, J. Sandweiss, S. Sato, W. B. Schmidke, N. Schmitz,
B. R. Schweid, F. Seck, J. Seger, R. Seto, P. Seyboth, N. Shah, E. Shahaliev,
P. V. Shanmuganathan, M. Shao, T. Shao, R. Sharma, A. I. Sheikh, D. Y. Shen,
S. S. Shi, Y. Shi, Q. Y. Shou, E. P. Sichtermann, R. Sikora, J. Singh, S.
Singha, P. Sinha, M. J. Skoby, N. Smirnov, Y. S\"ohngen, W. Solyst, Y. Song,
H. M. Spinka, B. Srivastava, T. D. S. Stanislaus, M. Stefaniak, D. J.
Stewart, M. Strikhanov, B. Stringfellow, A. A. P. Suaide, M. Sumbera, X. M.
Sun, X. Sun, Y. Sun, Y. Sun, B. Surrow, D. N. Svirida, Z. W. Sweger, P.
Szymanski, A. H. Tang, Z. Tang, A. Taranenko, T. Tarnowsky, J. H. Thomas, A.
R. Timmins, D. Tlusty, T. Todoroki, M. Tokarev, C. A. Tomkiel, S.
Trentalange, R. E. Tribble, P. Tribedy, S. K. Tripathy, T. Truhlar, B. A.
Trzeciak, O. D. Tsai, Z. Tu, T. Ullrich, D. G. Underwood, I. Upsal, G. Van
Buren, J. Vanek, A. N. Vasiliev, I. Vassiliev, V. Verkest, F. Videb{\ae}k, S.
Vokal, S. A. Voloshin, F. Wang, G. Wang, J. S. Wang, P. Wang, X. Wang, Y.
Wang, Y. Wang, Z. Wang, J. C. Webb, P. C. Weidenkaff, G. D. Westfall, H.
Wieman, S. W. Wissink, R. Witt, J. Wu, J. Wu, Y. Wu, B. Xi, Z. G. Xiao, G.
Xie, W. Xie, H. Xu, N. Xu, Q. H. Xu, Y. Xu, Z. Xu, Z. Xu, G. Yan, C. Yang, Q.
Yang, S. Yang, Y. Yang, Z. Ye, Z. Ye, L. Yi, K. Yip, Y. Yu, H. Zbroszczyk, W.
Zha, C. Zhang, D. Zhang, J. Zhang, S. Zhang, S. Zhang, Y. Zhang, Y. Zhang, Y.
Zhang, Z. J. Zhang, Z. Zhang, Z. Zhang, F. Zhao, J. Zhao, M. Zhao, C. Zhou,
Y. Zhou, X. Zhu, M. Zurek, M. Zyzak | Pattern of Global Spin Alignment of $\phi$ and $K^{*0}$ mesons in
Heavy-Ion Collisions | null | null | 10.1038/s41586-022-05557-5 | null | hep-ph nucl-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Notwithstanding decades of progress since Yukawa first developed a
description of the force between nucleons in terms of meson exchange, a full
understanding of the strong interaction remains a major challenge in modern
science. One remaining difficulty arises from the non-perturbative nature of
the strong force, which leads to the phenomenon of quark confinement at
distances on the order of the size of the proton. Here we show that in
relativistic heavy-ion collisions, where quarks and gluons are set free over an
extended volume, two species of produced vector (spin-1) mesons, namely $\phi$
and $K^{*0}$, emerge with a surprising pattern of global spin alignment. In
particular, the global spin alignment for $\phi$ is unexpectedly large, while
that for $K^{*0}$ is consistent with zero. The observed spin-alignment pattern
and magnitude for the $\phi$ cannot be explained by conventional mechanisms,
while a model with a connection to strong force fields, i.e. an effective proxy
description within the Standard Model and Quantum Chromodynamics, accommodates
the current data. This connection, if fully established, will open a potential
new avenue for studying the behaviour of strong force fields.
| [
{
"created": "Tue, 5 Apr 2022 15:55:21 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 19:17:37 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Jan 2023 17:34:20 GMT",
"version": "v3"
}
] | 2023-01-19 | [
[
"STAR Collaboration",
"",
""
],
[
"Abdallah",
"M. S.",
""
],
[
"Aboona",
"B. E.",
""
],
[
"Adam",
"J.",
""
],
[
"Adamczyk",
"L.",
""
],
[
"Adams",
"J. R.",
""
],
[
"Adkins",
"J. K.",
""
],
[
"Agakishiev",
"G.",
""
],
[
"Aggarwal",
"I.",
""
],
[
"Aggarwal",
"M. M.",
""
],
[
"Ahammed",
"Z.",
""
],
[
"Aitbaev",
"A.",
""
],
[
"Alekseev",
"I.",
""
],
[
"Anderson",
"D. M.",
""
],
[
"Aparin",
"A.",
""
],
[
"Aschenauer",
"E. C.",
""
],
[
"Ashraf",
"M. U.",
""
],
[
"Atetalla",
"F. G.",
""
],
[
"Averichev",
"G. S.",
""
],
[
"Bairathi",
"V.",
""
],
[
"Baker",
"W.",
""
],
[
"Cap",
"J. G. Ball",
""
],
[
"Barish",
"K.",
""
],
[
"Behera",
"A.",
""
],
[
"Bellwied",
"R.",
""
],
[
"Bhagat",
"P.",
""
],
[
"Bhasin",
"A.",
""
],
[
"Bielcik",
"J.",
""
],
[
"Bielcikova",
"J.",
""
],
[
"Bordyuzhin",
"I. G.",
""
],
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] | Notwithstanding decades of progress since Yukawa first developed a description of the force between nucleons in terms of meson exchange, a full understanding of the strong interaction remains a major challenge in modern science. One remaining difficulty arises from the non-perturbative nature of the strong force, which leads to the phenomenon of quark confinement at distances on the order of the size of the proton. Here we show that in relativistic heavy-ion collisions, where quarks and gluons are set free over an extended volume, two species of produced vector (spin-1) mesons, namely $\phi$ and $K^{*0}$, emerge with a surprising pattern of global spin alignment. In particular, the global spin alignment for $\phi$ is unexpectedly large, while that for $K^{*0}$ is consistent with zero. The observed spin-alignment pattern and magnitude for the $\phi$ cannot be explained by conventional mechanisms, while a model with a connection to strong force fields, i.e. an effective proxy description within the Standard Model and Quantum Chromodynamics, accommodates the current data. This connection, if fully established, will open a potential new avenue for studying the behaviour of strong force fields. |
2308.14811 | Gauhar Abbas | Gauhar Abbas, Rathin Adhikari, Eung Jin Chun, Neelam Singh | The problem of flavour | 22 pages, 21 figures, contribution to FRONTIERS IN PARTICLE PHYSICS
2023 | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We review the problem of flavour tracing back to the days when the standard
model was just coming together. We focus on the recently discussed new
solutions of this problem, namely models based on the discrete
$\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M}$ flavour symmetry and the VEVs
hierarchy, and discuss their various phenomenological consequences. In
particular, there appears a novel feature that the solution of the flavour
problem based on the discrete flavour symmetry can provide the so-called
flavonic dark matter. This predicts a specific relation between the mass and
the symmetry-breaking scale, which can be contrasted with the standard QCD
axion.
| [
{
"created": "Mon, 28 Aug 2023 18:02:49 GMT",
"version": "v1"
}
] | 2023-08-30 | [
[
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"Gauhar",
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[
"Adhikari",
"Rathin",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"Singh",
"Neelam",
""
]
] | We review the problem of flavour tracing back to the days when the standard model was just coming together. We focus on the recently discussed new solutions of this problem, namely models based on the discrete $\mathcal{Z}_{\rm N} \times \mathcal{Z}_{\rm M}$ flavour symmetry and the VEVs hierarchy, and discuss their various phenomenological consequences. In particular, there appears a novel feature that the solution of the flavour problem based on the discrete flavour symmetry can provide the so-called flavonic dark matter. This predicts a specific relation between the mass and the symmetry-breaking scale, which can be contrasted with the standard QCD axion. |
hep-ph/0703284 | Jonathan M. Flynn | Jonathan M Flynn and Juan Nieves | |Vub| from Exclusive Semileptonic B to pi Decays | 10 pages, Latex, 2 figures; version accepted for publication | Phys.Lett.B649:269-274,2007 | 10.1016/j.physletb.2007.04.028 | SHEP 0710 | hep-ph | null | We use Omnes representations of the form factors f_+ and f_0 for exclusive
semileptonic B to pi decays, paying special attention to the treatment of the
B* pole and its effect on f_+. We apply them to combine experimental partial
branching fraction information with theoretical calculations of both form
factors to extract |Vub|. The precision we achieve is competitive with the
inclusive determination and we do not find a significant discrepancy between
our result, |Vub| =(3.90+/-0.32+/-0.18)10^(-3), and the inclusive world average
value, (4.45+/-0.20+/-0.26)10^(-3).
| [
{
"created": "Tue, 27 Mar 2007 16:02:37 GMT",
"version": "v1"
},
{
"created": "Thu, 17 May 2007 13:28:20 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Flynn",
"Jonathan M",
""
],
[
"Nieves",
"Juan",
""
]
] | We use Omnes representations of the form factors f_+ and f_0 for exclusive semileptonic B to pi decays, paying special attention to the treatment of the B* pole and its effect on f_+. We apply them to combine experimental partial branching fraction information with theoretical calculations of both form factors to extract |Vub|. The precision we achieve is competitive with the inclusive determination and we do not find a significant discrepancy between our result, |Vub| =(3.90+/-0.32+/-0.18)10^(-3), and the inclusive world average value, (4.45+/-0.20+/-0.26)10^(-3). |
1306.4644 | Satoshi Mishima | Marco Ciuchini, Enrico Franco, Satoshi Mishima, Luca Silvestrini | Electroweak Precision Observables, New Physics and the Nature of a 126
GeV Higgs Boson | 44 pages, 12 figures. v2: references added, version to appear in JHEP | null | 10.1007/JHEP08(2013)106 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform the fit of electroweak precision observables within the Standard
Model with a 126 GeV Higgs boson, compare the results with the theoretical
predictions and discuss the impact of recent experimental and theoretical
improvements. We introduce New Physics contributions in a model-independent way
and fit for the S, T and U parameters, for the $\epsilon_{1,2,3,b}$ ones, for
modified $Zb\bar{b}$ couplings and for a modified Higgs coupling to vector
bosons. We point out that composite Higgs models are very strongly constrained.
Finally, we compute the bounds on dimension-six operators relevant for the
electroweak fit.
| [
{
"created": "Wed, 19 Jun 2013 19:04:53 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2013 00:10:14 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Ciuchini",
"Marco",
""
],
[
"Franco",
"Enrico",
""
],
[
"Mishima",
"Satoshi",
""
],
[
"Silvestrini",
"Luca",
""
]
] | We perform the fit of electroweak precision observables within the Standard Model with a 126 GeV Higgs boson, compare the results with the theoretical predictions and discuss the impact of recent experimental and theoretical improvements. We introduce New Physics contributions in a model-independent way and fit for the S, T and U parameters, for the $\epsilon_{1,2,3,b}$ ones, for modified $Zb\bar{b}$ couplings and for a modified Higgs coupling to vector bosons. We point out that composite Higgs models are very strongly constrained. Finally, we compute the bounds on dimension-six operators relevant for the electroweak fit. |
1810.01764 | Antonio Enrique C\'arcamo Hern\'andez | A. E. C\'arcamo Hern\'andez, Juan Carlos G\'omez-Izquierdo, Sergey
Kovalenko, M. Mondrag\'on | $\Delta \left( 27\right)$ flavor singlet-triplet Higgs model for fermion
masses and mixings | Revised version. Discussion enlarged, text improved. References
added. 19 pages, 2 figures | null | 10.1016/j.nuclphysb.2019.114688 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a multiscalar singlet extension of the singlet-triplet Higgs model
capable of explaining the SM fermion mass spectrum and mixing parameters. Our
model is based on the $\Delta \left( 27\right) $ family symmetry, supplemented
by cyclic symmetries, which are spontaneously broken thus yielding the observed
hierarchy of the SM charged fermion masses and quark mixing angles. The masses
of the light active neutrinos are produced by type-II seesaw mechanism mediated
by the neutral component of the $SU(2)_{L}$ scalar triplet. The model
symmetries lead to the extended Gatto-Sartori-Tonin relations between the quark
masses and mixing angles.
| [
{
"created": "Tue, 2 Oct 2018 14:14:02 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Apr 2019 02:01:56 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Gómez-Izquierdo",
"Juan Carlos",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Mondragón",
"M.",
""
]
] | We propose a multiscalar singlet extension of the singlet-triplet Higgs model capable of explaining the SM fermion mass spectrum and mixing parameters. Our model is based on the $\Delta \left( 27\right) $ family symmetry, supplemented by cyclic symmetries, which are spontaneously broken thus yielding the observed hierarchy of the SM charged fermion masses and quark mixing angles. The masses of the light active neutrinos are produced by type-II seesaw mechanism mediated by the neutral component of the $SU(2)_{L}$ scalar triplet. The model symmetries lead to the extended Gatto-Sartori-Tonin relations between the quark masses and mixing angles. |
1706.03432 | Yoshimasa Kurihara | Nhi M. U. Quach, Yoshimasa Kurihara, Khiem H. Phan, Takahiro Ueda | Beam polarization effects on top-pair production at the ILC | 15 pages, 8 figures | Eur. Phys. J. C (2018) 78: 422 | 10.1140/epjc/s10052-018-5895-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Full one-loop electroweak-corrections for an $e^-e^+\rightarrow t \bar{t}$
process associated with sequential $t\rightarrow b \mu\nu_\mu$ decay are
discussed. At the one-loop level, the spin-polarization effects of the initial
electron and positron beams are included in the total and differential cross
sections. A narrow-width approximation is used to treat the top-quark
production and decay while including full spin correlations between them. We
observed that the radiative corrections due to the weak interaction have a
large polarization dependence on both the total and differential cross
sections. Therefore, experimental observables that depend on angular
distributions such as the forward-backward asymmetry of the top production
angle must be treated carefully including radiative corrections. We also
observed that the energy distribution of bottom quarks is majorly affected by
the radiative corrections.
| [
{
"created": "Mon, 12 Jun 2017 01:34:05 GMT",
"version": "v1"
}
] | 2018-06-25 | [
[
"Quach",
"Nhi M. U.",
""
],
[
"Kurihara",
"Yoshimasa",
""
],
[
"Phan",
"Khiem H.",
""
],
[
"Ueda",
"Takahiro",
""
]
] | Full one-loop electroweak-corrections for an $e^-e^+\rightarrow t \bar{t}$ process associated with sequential $t\rightarrow b \mu\nu_\mu$ decay are discussed. At the one-loop level, the spin-polarization effects of the initial electron and positron beams are included in the total and differential cross sections. A narrow-width approximation is used to treat the top-quark production and decay while including full spin correlations between them. We observed that the radiative corrections due to the weak interaction have a large polarization dependence on both the total and differential cross sections. Therefore, experimental observables that depend on angular distributions such as the forward-backward asymmetry of the top production angle must be treated carefully including radiative corrections. We also observed that the energy distribution of bottom quarks is majorly affected by the radiative corrections. |
1305.0369 | Dong Phung Van | P. V. Dong, H. T. Hung, T. D. Tham | 3-3-1-1 model for dark matter | 32 pages, 2 figures, revised version, to appear in Physical Review D | Physical Review D 87, 115003 (2013) | 10.1103/PhysRevD.87.115003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the SU(3)_C X SU(3)_L X U(1)_X (3-3-1) model of strong and
electroweak interactions can naturally accommodate an extra U(1)_N symmetry
behaving as a gauge symmetry. Resulting theory based on SU(3)_C X SU(3)_L X
U(1)_X X U(1)_N (3-3-1-1) gauge symmetry realizes B-L=-(2/\sqrt{3})T_8+N as a
charge of SU(3)_L X U(1)_N. Consequently, a residual symmetry, W-parity,
resulting from broken B-L in similarity to R-parity in supersymmetry is always
conserved and may be unbroken. There is a specific fermion content recently
studied in which all new particles that have wrong lepton-numbers are odd under
W-parity, while the standard model particles are even. Therefore, the lightest
wrong-lepton particle (LWP) responsible for dark matter is naturally
stabilized. We explicitly show that the non-Hermitian neutral gauge boson (X^0)
as LWP cannot be a dark matter. However, the LWP as a new neutral fermion (N_R)
can be dark matter if its mass is in range 1.9 TeV \leq m_{N_R} \leq 2.5 TeV,
provided that the new neutral gauge boson (Z') mass satisfies 2.2 TeV \leq m_Z'
\leq 2.5 TeV. Moreover, the scalar dark matter candidate (H'\simeq \eta_3)
which has traditionally been studied is only stabilized by W-parity. All the
unwanted interactions and vacuums as often encountered in the 3-3-1 model are
naturally suppressed. And, the standing issues on tree-level flavor changing
neutral currents and CPT violation also disappear.
| [
{
"created": "Thu, 2 May 2013 08:40:33 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2013 08:18:30 GMT",
"version": "v2"
}
] | 2013-06-05 | [
[
"Dong",
"P. V.",
""
],
[
"Hung",
"H. T.",
""
],
[
"Tham",
"T. D.",
""
]
] | We show that the SU(3)_C X SU(3)_L X U(1)_X (3-3-1) model of strong and electroweak interactions can naturally accommodate an extra U(1)_N symmetry behaving as a gauge symmetry. Resulting theory based on SU(3)_C X SU(3)_L X U(1)_X X U(1)_N (3-3-1-1) gauge symmetry realizes B-L=-(2/\sqrt{3})T_8+N as a charge of SU(3)_L X U(1)_N. Consequently, a residual symmetry, W-parity, resulting from broken B-L in similarity to R-parity in supersymmetry is always conserved and may be unbroken. There is a specific fermion content recently studied in which all new particles that have wrong lepton-numbers are odd under W-parity, while the standard model particles are even. Therefore, the lightest wrong-lepton particle (LWP) responsible for dark matter is naturally stabilized. We explicitly show that the non-Hermitian neutral gauge boson (X^0) as LWP cannot be a dark matter. However, the LWP as a new neutral fermion (N_R) can be dark matter if its mass is in range 1.9 TeV \leq m_{N_R} \leq 2.5 TeV, provided that the new neutral gauge boson (Z') mass satisfies 2.2 TeV \leq m_Z' \leq 2.5 TeV. Moreover, the scalar dark matter candidate (H'\simeq \eta_3) which has traditionally been studied is only stabilized by W-parity. All the unwanted interactions and vacuums as often encountered in the 3-3-1 model are naturally suppressed. And, the standing issues on tree-level flavor changing neutral currents and CPT violation also disappear. |
1507.07569 | Sovan Chakraborty | Sovan Chakraborty, Rasmus Sloth Hansen, Ignacio Izaguirre and Georg
Raffelt | Self-induced flavor conversion of supernova neutrinos on small scales | 50 pages, 17 figures, minor improvements in the conclusions,
references added. Matches version published in JCAP | JCAP 1601 (2016) 028 | 10.1088/1475-7516/2016/01/028 | null | hep-ph astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-induced flavor conversion of supernova (SN) neutrinos is a generic
feature of neutrino-neutrino dispersion. The corresponding run-away modes in
flavor space can spontaneously break the original symmetries of the neutrino
flux and in particular can spontaneously produce small-scale features as shown
in recent schematic studies. However, the unavoidable "multi-angle matter
effect" shifts these small-scale instabilities into regions of matter and
neutrino density which are not encountered on the way out from a SN. The
traditional modes which are uniform on the largest scales are most prone for
instabilities and thus provide the most sensitive test for the appearance of
self-induced flavor conversion. As a by-product we clarify the relation between
the time evolution of an expanding neutrino gas and the radial evolution of a
stationary SN neutrino flux. Our results depend on several simplifying
assumptions, notably stationarity of the solution, the absence of a "backward"
neutrino flux caused by residual scattering, and global spherical symmetry of
emission.
| [
{
"created": "Mon, 27 Jul 2015 20:03:13 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jan 2016 15:38:57 GMT",
"version": "v2"
}
] | 2016-04-04 | [
[
"Chakraborty",
"Sovan",
""
],
[
"Hansen",
"Rasmus Sloth",
""
],
[
"Izaguirre",
"Ignacio",
""
],
[
"Raffelt",
"Georg",
""
]
] | Self-induced flavor conversion of supernova (SN) neutrinos is a generic feature of neutrino-neutrino dispersion. The corresponding run-away modes in flavor space can spontaneously break the original symmetries of the neutrino flux and in particular can spontaneously produce small-scale features as shown in recent schematic studies. However, the unavoidable "multi-angle matter effect" shifts these small-scale instabilities into regions of matter and neutrino density which are not encountered on the way out from a SN. The traditional modes which are uniform on the largest scales are most prone for instabilities and thus provide the most sensitive test for the appearance of self-induced flavor conversion. As a by-product we clarify the relation between the time evolution of an expanding neutrino gas and the radial evolution of a stationary SN neutrino flux. Our results depend on several simplifying assumptions, notably stationarity of the solution, the absence of a "backward" neutrino flux caused by residual scattering, and global spherical symmetry of emission. |
2203.14976 | Manibrata Sen | Andr\'e de Gouv\^ea, Manibrata Sen, Jean Weill | Visible Neutrino Decays and the Impact of the Daughter-Neutrino Mass | 23 pages, 14 figures, matches published version | null | 10.1103/PhysRevD.106.013005 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We compute the differential decay width of two- and three-body neutrino
decays, assuming neutrinos are Dirac fermions and allowing for the possibility
that the decay-daughters have nonzero masses. We examine different hypotheses
for the interaction that mediates neutrino decay and concentrate on identifying
circumstances where the decay-daughters can significantly impact the
neutrino-decay signature at different experiments. We are especially interested
in decay daughters produced by right-chiral neutrino fields, when the mass of
the daughter plays a decisive role. As a concrete example, we compare the
effects of visible and invisible antineutrino decays at the JUNO experimental
setup.
| [
{
"created": "Mon, 28 Mar 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2023 14:28:37 GMT",
"version": "v2"
}
] | 2023-08-17 | [
[
"de Gouvêa",
"André",
""
],
[
"Sen",
"Manibrata",
""
],
[
"Weill",
"Jean",
""
]
] | We compute the differential decay width of two- and three-body neutrino decays, assuming neutrinos are Dirac fermions and allowing for the possibility that the decay-daughters have nonzero masses. We examine different hypotheses for the interaction that mediates neutrino decay and concentrate on identifying circumstances where the decay-daughters can significantly impact the neutrino-decay signature at different experiments. We are especially interested in decay daughters produced by right-chiral neutrino fields, when the mass of the daughter plays a decisive role. As a concrete example, we compare the effects of visible and invisible antineutrino decays at the JUNO experimental setup. |
hep-ph/0205070 | Takahashi Keitaro | K.Takahashi and K.Sato | Effects of neutrino oscillation on supernova neutrino: inverted mass
hierarchy | 13 pages, 9 figures, significantly revised. Published version in PTP | Prog.Theor.Phys. 109 (2003) 919-931 | 10.1143/PTP.109.919 | UTAP-415/02 | hep-ph | null | We study the effects of neutrino oscillation on supernova neutrino in the
case of the inverted mass hierarchy ($m_{3} \ll m_{1} < m_{2}$) as well as the
normal mass hierarchy ($m_{1} < m_{2} \ll m_{3}$). Numerical analysis using a
realistic supernova and presupernova model allows us to discuss quantitatively
a possibility to probe neutrino oscillation parameters. We show that
information about the mass hierarchy can be obtained if $\theta_{13}$ is rather
large ($\sin^{2}{2 \theta_{13}} > 10^{-3}$) and that $\theta_{13}$ can be well
probed by SuperKamiokande if the neutrino mass hierarchy is the inverted case.
Errors due to the uncertainty of the original neutrino spectra and the Earth
effect are also discussed.
| [
{
"created": "Wed, 8 May 2002 07:12:17 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2002 04:43:29 GMT",
"version": "v2"
},
{
"created": "Tue, 6 May 2003 07:53:12 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Takahashi",
"K.",
""
],
[
"Sato",
"K.",
""
]
] | We study the effects of neutrino oscillation on supernova neutrino in the case of the inverted mass hierarchy ($m_{3} \ll m_{1} < m_{2}$) as well as the normal mass hierarchy ($m_{1} < m_{2} \ll m_{3}$). Numerical analysis using a realistic supernova and presupernova model allows us to discuss quantitatively a possibility to probe neutrino oscillation parameters. We show that information about the mass hierarchy can be obtained if $\theta_{13}$ is rather large ($\sin^{2}{2 \theta_{13}} > 10^{-3}$) and that $\theta_{13}$ can be well probed by SuperKamiokande if the neutrino mass hierarchy is the inverted case. Errors due to the uncertainty of the original neutrino spectra and the Earth effect are also discussed. |
hep-ph/0503017 | Nobuhiro Uekusa | Naohiro Muta and Nobuhiro Uekusa | Localized Kaluza-Klein Graviton and Cosmological Constant | 15 pages; references added | null | null | SAGA-HE-219, KYUSHU-HET-82 | hep-ph | null | We study linearized graviton in the presence of a four-dimensional
cosmological constant in two brane models with a warped extra dimension. In
explicit models including bulk scalar fields, we calculate the masses of
Kaluza-Klein modes of graviton and their interactions with matter on the
visible brane. It is shown that the effects of the cosmological constant
contribute by the equivalent size to the warp factor, masses and couplings and
that bulk scalar fields can increase the effects. This is examined further
independently of the forms of scalar potentials. Then it is found how the
masses and couplings are described in terms of the warp factors and generic
scalar potentials. A possibility that the masses and couplings are
significantly changed by cosmological constant effects is discussed.
| [
{
"created": "Wed, 2 Mar 2005 07:19:15 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2005 07:55:17 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jan 2006 05:05:15 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Muta",
"Naohiro",
""
],
[
"Uekusa",
"Nobuhiro",
""
]
] | We study linearized graviton in the presence of a four-dimensional cosmological constant in two brane models with a warped extra dimension. In explicit models including bulk scalar fields, we calculate the masses of Kaluza-Klein modes of graviton and their interactions with matter on the visible brane. It is shown that the effects of the cosmological constant contribute by the equivalent size to the warp factor, masses and couplings and that bulk scalar fields can increase the effects. This is examined further independently of the forms of scalar potentials. Then it is found how the masses and couplings are described in terms of the warp factors and generic scalar potentials. A possibility that the masses and couplings are significantly changed by cosmological constant effects is discussed. |
2107.04563 | Cem Salih Un | Qaisar Shafi and Cem Salih Un | Sparticle Spectroscopy at LHC-Run3 and LSP Dark Matter in light of Muon
g-2 | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the latest measurement of muon g-2 by the Fermilab Experiment, we
revisit a class of supersymmetric models in which non-universality at M_GUT
allows us to realize relatively light sleptons in the few hundred GeV range.
These sleptons provide additional contributions to muon g-2 that can be
arranged to reconcile theory and experiment. The solutions compatible with the
muon g-2 resolution typically predict light sleptons, charginos and
neutralinos. We show how these solutions can be probed during LHC-Run3. A
direct impact on the chargino mass is observed such that the chargino can be
probed up to about 800 GeV during the Run3 experiments. Despite such a direct
impact, it is still possible to realize lighter chargino masses which can
escape detection due to the chirality mixture of the lighter slepton states.
The colored squarks as well as the gluino turn out to be heavier than about 3-4
TeV if the LSP neutralino satisfies the Planck bound on the dark matter relic
abundance. We highlight a variety of benchmark points and, in particular,
coannihilation scenarios with dark matter candidates that will be tested in the
ongoing and planned direct and indirect detection experiments. By relaxing the
requirement that the LSP neutralino saturates the relic dark matter abundance,
we are able to find solutions with gluino and squark masses in a range that may
be accessible at LHC-Run3.
| [
{
"created": "Fri, 9 Jul 2021 17:30:11 GMT",
"version": "v1"
}
] | 2021-07-12 | [
[
"Shafi",
"Qaisar",
""
],
[
"Un",
"Cem Salih",
""
]
] | Inspired by the latest measurement of muon g-2 by the Fermilab Experiment, we revisit a class of supersymmetric models in which non-universality at M_GUT allows us to realize relatively light sleptons in the few hundred GeV range. These sleptons provide additional contributions to muon g-2 that can be arranged to reconcile theory and experiment. The solutions compatible with the muon g-2 resolution typically predict light sleptons, charginos and neutralinos. We show how these solutions can be probed during LHC-Run3. A direct impact on the chargino mass is observed such that the chargino can be probed up to about 800 GeV during the Run3 experiments. Despite such a direct impact, it is still possible to realize lighter chargino masses which can escape detection due to the chirality mixture of the lighter slepton states. The colored squarks as well as the gluino turn out to be heavier than about 3-4 TeV if the LSP neutralino satisfies the Planck bound on the dark matter relic abundance. We highlight a variety of benchmark points and, in particular, coannihilation scenarios with dark matter candidates that will be tested in the ongoing and planned direct and indirect detection experiments. By relaxing the requirement that the LSP neutralino saturates the relic dark matter abundance, we are able to find solutions with gluino and squark masses in a range that may be accessible at LHC-Run3. |
1201.2768 | Micha{\l} Szleper | K. Doroba, J. Kalinowski, J. Kuczmarski, S. Pokorski, J. Rosiek, M.
Szleper, S. Tkaczyk | The W_L W_L scattering at the LHC: improving the selection criteria | 25 pages, 32 figures | null | 10.1103/PhysRevD.86.036011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic study of the different mechanisms leading to WW pair
production at the LHC, both in the same-sign and opposite-sign channels, and we
emphasize that the former offers much better potential for investigating
non-resonant W_L W_L scattering. We propose a new kinematic variable to isolate
the W_L W_L scattering component in same-sign WW production at the LHC.
Focusing on purely leptonic W decay channels, we show that it considerably
improves the LHC capabilities to shed light on the electroweak symmetry
breaking mechanism after collecting 100 fb^{-1} of data at sqrt{s} = 14 TeV.
The new variable is less effective in the opposite-sign WW channel due to
different background composition.
| [
{
"created": "Fri, 13 Jan 2012 09:03:19 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2012 14:42:55 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Doroba",
"K.",
""
],
[
"Kalinowski",
"J.",
""
],
[
"Kuczmarski",
"J.",
""
],
[
"Pokorski",
"S.",
""
],
[
"Rosiek",
"J.",
""
],
[
"Szleper",
"M.",
""
],
[
"Tkaczyk",
"S.",
""
]
] | We present a systematic study of the different mechanisms leading to WW pair production at the LHC, both in the same-sign and opposite-sign channels, and we emphasize that the former offers much better potential for investigating non-resonant W_L W_L scattering. We propose a new kinematic variable to isolate the W_L W_L scattering component in same-sign WW production at the LHC. Focusing on purely leptonic W decay channels, we show that it considerably improves the LHC capabilities to shed light on the electroweak symmetry breaking mechanism after collecting 100 fb^{-1} of data at sqrt{s} = 14 TeV. The new variable is less effective in the opposite-sign WW channel due to different background composition. |
hep-ph/0309234 | Stefan Scherer | Thomas Fuchs, Jambul Gegelia, Stefan Scherer | Structure of the nucleon in chiral perturbation theory | Invited talk given by S. Scherer at the Fourth International
Conference on Perspectives in Hadronic Physics, Trieste, Italy, 12 -16 May
2003, 8 pages, 7 figures | Eur.Phys.J. A19 (2004) 35-42 | 10.1140/epjad/s2004-03-006-0 | MKPH-T-03-16 | hep-ph nucl-th | null | We discuss a renormalization scheme for relativistic baryon chiral
perturbation theory which provides a simple and consistent power counting for
renormalized diagrams. The method involves finite subtractions of dimensionally
regularized diagrams beyond the standard modified minimal subtraction scheme of
chiral perturbation theory to remove contributions violating the power
counting. This is achieved by a suitable renormalization of the parameters of
the most general effective Lagrangian. As applications we discuss the mass of
the nucleon, the $\sigma$ term, and the scalar and electromagnetic form
factors.
| [
{
"created": "Fri, 19 Sep 2003 14:44:22 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Fuchs",
"Thomas",
""
],
[
"Gegelia",
"Jambul",
""
],
[
"Scherer",
"Stefan",
""
]
] | We discuss a renormalization scheme for relativistic baryon chiral perturbation theory which provides a simple and consistent power counting for renormalized diagrams. The method involves finite subtractions of dimensionally regularized diagrams beyond the standard modified minimal subtraction scheme of chiral perturbation theory to remove contributions violating the power counting. This is achieved by a suitable renormalization of the parameters of the most general effective Lagrangian. As applications we discuss the mass of the nucleon, the $\sigma$ term, and the scalar and electromagnetic form factors. |
1305.7310 | Vladimir Saleev | Maxim Nefedov, Vladimir Saleev, and Alexandera Shipilova | Prompt Upsilon(nS) production at the LHC in the Regge limit of QCD | 22 pages, 7 figures, 2 tables. arXiv admin note: substantial text
overlap with arXiv:1201.3464 | null | 10.1103/PhysRevD.88.014003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study prompt Upsilon(nS) hadroproduction (n=1,2,3) invoking the hypothesis
of gluon Reggeization in t-channel exchanges at high energy and the
factorization formalism of nonrelativistic quantum chromodynamics at leading
order in the strong-coupling constant alpha_s and the relative velocity v of
the bound quarks. The transverse-momentum distributions of prompt
Upsilon(nS)-meson production measured by the ATLAS Collaboration at the CERN
LHC are fitted to obtain the color-octet nonperturbative long-distance matrix
elements, which are used to predict prompt Upsilon(nS) production spectra
measured by the CMS and LHCb Collaborations. At the numerical calculation, we
adopt the Kimber-Martin-Ryskin prescription to derive unintegrated gluon
distribution function of the proton from its collinear counterpart, for which
we use the Martin-Roberts-Stirling-Thorne set. We find good agreement with
measurements by the ATLAS, CMS and LHCb Collaborations at the LHC at the
hadronic c.m. energy sqrt S=7 TeV as well as with measurements by the CDF
Collaboration at the Fermilab Tevatron.
| [
{
"created": "Fri, 31 May 2013 06:42:01 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Nefedov",
"Maxim",
""
],
[
"Saleev",
"Vladimir",
""
],
[
"Shipilova",
"Alexandera",
""
]
] | We study prompt Upsilon(nS) hadroproduction (n=1,2,3) invoking the hypothesis of gluon Reggeization in t-channel exchanges at high energy and the factorization formalism of nonrelativistic quantum chromodynamics at leading order in the strong-coupling constant alpha_s and the relative velocity v of the bound quarks. The transverse-momentum distributions of prompt Upsilon(nS)-meson production measured by the ATLAS Collaboration at the CERN LHC are fitted to obtain the color-octet nonperturbative long-distance matrix elements, which are used to predict prompt Upsilon(nS) production spectra measured by the CMS and LHCb Collaborations. At the numerical calculation, we adopt the Kimber-Martin-Ryskin prescription to derive unintegrated gluon distribution function of the proton from its collinear counterpart, for which we use the Martin-Roberts-Stirling-Thorne set. We find good agreement with measurements by the ATLAS, CMS and LHCb Collaborations at the LHC at the hadronic c.m. energy sqrt S=7 TeV as well as with measurements by the CDF Collaboration at the Fermilab Tevatron. |
hep-ph/0102184 | Gabriela Barenboim | M.C.Banuls (IFIC), G.Barenboim (CERN) and J.Bernabeu (CERN and
U.Valencia) | Medium effects for terrestrial and atmospheric neutrino oscillations | 13 pages with 5 figures | Phys.Lett.B513:391-400,2001 | 10.1016/S0370-2693(01)00723-7 | null | hep-ph | null | Matter effects in neutrino propagation translate into effective parameters
for the oscillation and fake CP- and CPT-odd quantities, even in a scenario,
such as $\Delta_{12}=0$, where no genuine CP violation is present. This fact
seems to impose severe restrictions on the determination of intrinsic
parameters of the system from long-baseline experiments. We show, however, that
the resonance in the effective mixing $\tilde{\theta}_{13}$ can be observed for
a certain range of baselines. This provides a way to measure the vacuum mixing
angle $\theta_{13}$ and the sign of $\Delta m_{23}^2$ from atmospheric
neutrinos, using a detector with energy resolution and charge discrimination.
| [
{
"created": "Thu, 15 Feb 2001 08:19:31 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Banuls",
"M. C.",
"",
"IFIC"
],
[
"Barenboim",
"G.",
"",
"CERN"
],
[
"Bernabeu",
"J.",
"",
"CERN and\n U.Valencia"
]
] | Matter effects in neutrino propagation translate into effective parameters for the oscillation and fake CP- and CPT-odd quantities, even in a scenario, such as $\Delta_{12}=0$, where no genuine CP violation is present. This fact seems to impose severe restrictions on the determination of intrinsic parameters of the system from long-baseline experiments. We show, however, that the resonance in the effective mixing $\tilde{\theta}_{13}$ can be observed for a certain range of baselines. This provides a way to measure the vacuum mixing angle $\theta_{13}$ and the sign of $\Delta m_{23}^2$ from atmospheric neutrinos, using a detector with energy resolution and charge discrimination. |
hep-ph/9903220 | Gudrid Moortgat-Pick | G. Moortgat-Pick, H. Fraas, A. Bartl, W. Majerotto | Polarization and Spin Effects in Neutralino Production and Decay | 28 pages, 14 postscript figures, latex using epsf.sty, typographical
errors corrected in eqs.(17),(60),(61),(64) and (65) | Eur.Phys.J. C9 (1999) 521-534; Erratum-ibid. C9 (1999) 549 | null | WUE-ITP-99-006, UWThPh-1999-10, HEPHY-PUB 709/99 | hep-ph | null | We study the production of neutralinos e^+ e^- ->chi^0_i \chi^0_j with
polarized beams and the subsequent decays chi^0_i -> chi^0_k l^+ l^- and
chi^0_j -> chi^0_l l^+ l^-, including the complete spin correlations between
production and decay. We present analytical formulae for the differential cross
section of the combined process of production and decay of neutralinos. We also
allow for complex couplings. The spin correlations have a strong influence on
the decay angular distributions and the corresponding forward-backward
asymmetries. They are very sensitive to the SUSY parameters and depend strongly
on the beam polarizations. We present numerical results for the cross section
and the electron forward-backward asymmetry for e^+ e^- -> chi^0_1 chi^0_2,
chi^0_2 -> chi^0_1 e^+ e^-. We study the dependence on the parameter M' for
various mass splittings between tilde{e}_L and tilde{e}_R and different beam
polarizations.
| [
{
"created": "Mon, 1 Mar 1999 22:20:04 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Jul 1999 09:07:37 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Moortgat-Pick",
"G.",
""
],
[
"Fraas",
"H.",
""
],
[
"Bartl",
"A.",
""
],
[
"Majerotto",
"W.",
""
]
] | We study the production of neutralinos e^+ e^- ->chi^0_i \chi^0_j with polarized beams and the subsequent decays chi^0_i -> chi^0_k l^+ l^- and chi^0_j -> chi^0_l l^+ l^-, including the complete spin correlations between production and decay. We present analytical formulae for the differential cross section of the combined process of production and decay of neutralinos. We also allow for complex couplings. The spin correlations have a strong influence on the decay angular distributions and the corresponding forward-backward asymmetries. They are very sensitive to the SUSY parameters and depend strongly on the beam polarizations. We present numerical results for the cross section and the electron forward-backward asymmetry for e^+ e^- -> chi^0_1 chi^0_2, chi^0_2 -> chi^0_1 e^+ e^-. We study the dependence on the parameter M' for various mass splittings between tilde{e}_L and tilde{e}_R and different beam polarizations. |
0709.2359 | Ana Alboteanu | Ana Alboteanu, Thorsten Ohl, Reinhold R\"uckl (W\"urzburg University) | The Noncommutative Standard Model at the ILC | 5 pages, Latex, 6 eps-figures included, Talk given at 2007
International Linear Collider Workshop (LCWS07 and ILC07), Hamburg, Germany,
30 May - 3 Jun 2007, typos corrected | ECONF C0705302:TEV05,2007; Acta Phys.Polon.B38:3647,2007 | null | null | hep-ph | null | We study phenomenological consequences of a noncommutative extension of the
standard model in the theta-expanded approach at the ILC. We estimate the
sensitivity of the ILC for the noncommutative scale Lambda_NC. Comparing with
earlier estimates for the LHC, we demonstrate the complementarity of the
experiments at the two colliders.
| [
{
"created": "Fri, 14 Sep 2007 18:34:40 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2007 16:14:42 GMT",
"version": "v2"
}
] | 2009-02-16 | [
[
"Alboteanu",
"Ana",
"",
"Würzburg University"
],
[
"Ohl",
"Thorsten",
"",
"Würzburg University"
],
[
"Rückl",
"Reinhold",
"",
"Würzburg University"
]
] | We study phenomenological consequences of a noncommutative extension of the standard model in the theta-expanded approach at the ILC. We estimate the sensitivity of the ILC for the noncommutative scale Lambda_NC. Comparing with earlier estimates for the LHC, we demonstrate the complementarity of the experiments at the two colliders. |
1111.0222 | Xiangdong Gao | Gao Xiangdong, Qiang Li, Cai-Dian L\"u | Gluon Fusion induced Zg and Zgg Productions in the Standard Model at the
LHC | 8 pages, 5 figures | Int.J.Mod.Phys. A28 (2013) 1-8 | 10.1142/S0217751X13501017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report calculations of the gluon induced Zg and Zgg productions in the
Standard Model at the LHC operating at both 7 TeV and 14 TeV collision energy.
We present total cross sections and differential distributions of the processes
and compare them with the leading and next-to-leading order QCD pp -> Z+1 jet,
Z+2 jets results. Our results show that the gluon induced Zg and Zgg
productions contribute to pp -> Z+1 jet, Z+2 jets at 1% level.
| [
{
"created": "Tue, 1 Nov 2011 15:33:29 GMT",
"version": "v1"
}
] | 2013-09-11 | [
[
"Xiangdong",
"Gao",
""
],
[
"Li",
"Qiang",
""
],
[
"Lü",
"Cai-Dian",
""
]
] | We report calculations of the gluon induced Zg and Zgg productions in the Standard Model at the LHC operating at both 7 TeV and 14 TeV collision energy. We present total cross sections and differential distributions of the processes and compare them with the leading and next-to-leading order QCD pp -> Z+1 jet, Z+2 jets results. Our results show that the gluon induced Zg and Zgg productions contribute to pp -> Z+1 jet, Z+2 jets at 1% level. |
hep-ph/9902257 | Robin Stuart | Robin G. Stuart | An Improved Determination of the Fermi Coupling Constant, G_F | 9 pages, RevTeX, uses amsmath.sty and axodraw.sty. Talk presented at
DPF 99, UCLA, Los Angeles, USA, 5-9 January, 1999 | null | null | null | hep-ph | null | Over 40 years after the calculation of the 1-loop QED corrections to the muon
lifetime, new theoretical developments have made it possible to obtain an
analytic expression for the complete 2-loop QED contributions in the Fermi
theory. The exact result for the effects of virtual and real photons, virtual
electrons, muons and hadrons as well as e+e- pair creation is
Delta Gamma^(2)=Gamma_0(alpha/pi)^2[(156815/5184)-(1036/27)zeta(2)
-(895/36)zeta(3)+(67/8)zeta(4)
+53zeta(2)ln(2)-(0.042+/-0.002)]
where Gamma_0 is the tree-level width. This eliminates the theoretical error
in the extracted value of the Fermi coupling constant, G_F, which was
previously the source of the dominant uncertainty. The new value is
G_F=(1.16637 +/- 0.00001) x 10^-5 GeV^-2
The overall error has been roughly halved and is now entirely experimental.
Several experiments are planned for the next generation of muon lifetime
measurements and these can proceed unhindered by theoretical uncertainties.
| [
{
"created": "Fri, 5 Feb 1999 23:04:50 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 1999 03:12:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Stuart",
"Robin G.",
""
]
] | Over 40 years after the calculation of the 1-loop QED corrections to the muon lifetime, new theoretical developments have made it possible to obtain an analytic expression for the complete 2-loop QED contributions in the Fermi theory. The exact result for the effects of virtual and real photons, virtual electrons, muons and hadrons as well as e+e- pair creation is Delta Gamma^(2)=Gamma_0(alpha/pi)^2[(156815/5184)-(1036/27)zeta(2) -(895/36)zeta(3)+(67/8)zeta(4) +53zeta(2)ln(2)-(0.042+/-0.002)] where Gamma_0 is the tree-level width. This eliminates the theoretical error in the extracted value of the Fermi coupling constant, G_F, which was previously the source of the dominant uncertainty. The new value is G_F=(1.16637 +/- 0.00001) x 10^-5 GeV^-2 The overall error has been roughly halved and is now entirely experimental. Several experiments are planned for the next generation of muon lifetime measurements and these can proceed unhindered by theoretical uncertainties. |
hep-ph/9908245 | Boris Kopeliovich | B.Z. Kopeliovich, A. Schaefer and A.V. Tarasov | Nonperturbative Effects in Gluon Radiation and Photoproduction of Quark
Pairs | 58 pages of Latex including 11 figures. Shadowing for soft gluons and
Fig. 6 are added as well as a few references | Phys.Rev.D62:054022,2000 | 10.1103/PhysRevD.62.054022 | null | hep-ph nucl-th | null | We introduce a nonperturbative interaction for light-cone fluctuations
containing quarks and gluons. The $\bar qq$ interaction squeezes the transverse
size of these fluctuations in the photon and one does not need to simulate this
effect via effective quark masses. The strength of this interaction is fixed by
data. Data on diffractive dissociation of hadrons and photons show that the
nonperturbative interaction of gluons is much stronger. We fix the parameters
for the nonperturbative quark-gluon interaction by data for diffractive
dissociation to large masses (triple-Pomeron regime). This allows us to predict
nuclear shadowing for gluons which turns out to be not as strong as
perturbative QCD predicts. We expect a delayed onset of gluon shadowing at $x
\leq 10^{-2}$ shadowing of quarks. Gluon shadowing turns out to be nearly scale
invariant up to virtualities $Q^2\sim 4 GeV^2$ due to presence of a semihard
scale characterizing the strong nonperturbative interaction of gluons. We use
the same concept to improve our description of gluon bremsstrahlung which is
related to the distribution function for a quark-gluon fluctuation and the
interaction cross section of a $\bar qqG$ fluctuation with a nucleon. We expect
the nonperturbative interaction to suppress dramatically the gluon radiation at
small transverse momenta compared to perturbative calculations.
| [
{
"created": "Wed, 4 Aug 1999 10:23:42 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Apr 2000 12:35:24 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Schaefer",
"A.",
""
],
[
"Tarasov",
"A. V.",
""
]
] | We introduce a nonperturbative interaction for light-cone fluctuations containing quarks and gluons. The $\bar qq$ interaction squeezes the transverse size of these fluctuations in the photon and one does not need to simulate this effect via effective quark masses. The strength of this interaction is fixed by data. Data on diffractive dissociation of hadrons and photons show that the nonperturbative interaction of gluons is much stronger. We fix the parameters for the nonperturbative quark-gluon interaction by data for diffractive dissociation to large masses (triple-Pomeron regime). This allows us to predict nuclear shadowing for gluons which turns out to be not as strong as perturbative QCD predicts. We expect a delayed onset of gluon shadowing at $x \leq 10^{-2}$ shadowing of quarks. Gluon shadowing turns out to be nearly scale invariant up to virtualities $Q^2\sim 4 GeV^2$ due to presence of a semihard scale characterizing the strong nonperturbative interaction of gluons. We use the same concept to improve our description of gluon bremsstrahlung which is related to the distribution function for a quark-gluon fluctuation and the interaction cross section of a $\bar qqG$ fluctuation with a nucleon. We expect the nonperturbative interaction to suppress dramatically the gluon radiation at small transverse momenta compared to perturbative calculations. |
2310.13194 | Iain Bisset | Iain A. Bisset, Bhaskar Dutta, Wei-Chih Huang, Louis E. Strigari | Short Baseline Neutrino Anomalies at Stopped Pion Experiments | null | null | null | MI-HET-814 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stopped-pion experiments that measure coherent elastic neutrino-nucleus
scattering (CE$\nu$NS) are sensitive to sterile neutrinos via disappearance.
Using timing and energy spectra to perform flavor decomposition, we show that
the delayed electron neutrino component provides an independent test of
short-baseline anomalies that hint at $\sim$ eV-mass sterile neutrinos.
Dedicated experiments will be sensitive to nearly the entire sterile neutrino
parameter space consistent with short-baseline data.
| [
{
"created": "Thu, 19 Oct 2023 23:05:00 GMT",
"version": "v1"
}
] | 2023-10-23 | [
[
"Bisset",
"Iain A.",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Huang",
"Wei-Chih",
""
],
[
"Strigari",
"Louis E.",
""
]
] | Stopped-pion experiments that measure coherent elastic neutrino-nucleus scattering (CE$\nu$NS) are sensitive to sterile neutrinos via disappearance. Using timing and energy spectra to perform flavor decomposition, we show that the delayed electron neutrino component provides an independent test of short-baseline anomalies that hint at $\sim$ eV-mass sterile neutrinos. Dedicated experiments will be sensitive to nearly the entire sterile neutrino parameter space consistent with short-baseline data. |
1707.03829 | Anthony DiFranzo | Matthew R. Buckley and Anthony DiFranzo | Collapsed Dark Matter Structures | 6 pages, 1 figure, updated references and updated with changes for
published version | Phys. Rev. Lett. 120, 051102 (2018) | 10.1103/PhysRevLett.120.051102 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The distributions of dark matter and baryons in the Universe are known to be
very different: the dark matter resides in extended halos, while a significant
fraction of the baryons have radiated away much of their initial energy and
fallen deep into the potential wells. This difference in morphology leads to
the widely held conclusion that dark matter cannot cool and collapse on any
scale. We revisit this assumption, and show that a simple model where dark
matter is charged under a "dark electromagnetism" can allow dark matter to form
gravitationally collapsed objects with characteristic mass scales much smaller
than that of a Milky Way-type galaxy. Though the majority of the dark matter in
spiral galaxies would remain in the halo, such a model opens the possibility
that galaxies and their associated dark matter play host to a significant
number of collapsed substructures. The observational signatures of such
structures are not well explored, but potentially interesting.
| [
{
"created": "Wed, 12 Jul 2017 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Feb 2018 22:44:44 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Buckley",
"Matthew R.",
""
],
[
"DiFranzo",
"Anthony",
""
]
] | The distributions of dark matter and baryons in the Universe are known to be very different: the dark matter resides in extended halos, while a significant fraction of the baryons have radiated away much of their initial energy and fallen deep into the potential wells. This difference in morphology leads to the widely held conclusion that dark matter cannot cool and collapse on any scale. We revisit this assumption, and show that a simple model where dark matter is charged under a "dark electromagnetism" can allow dark matter to form gravitationally collapsed objects with characteristic mass scales much smaller than that of a Milky Way-type galaxy. Though the majority of the dark matter in spiral galaxies would remain in the halo, such a model opens the possibility that galaxies and their associated dark matter play host to a significant number of collapsed substructures. The observational signatures of such structures are not well explored, but potentially interesting. |
1305.0002 | Felix Kling | Baradhwaj Coleppa, Felix Kling and Shufang Su | Constraining Type II 2HDM in Light of LHC Higgs Searches | 34 pages, 18 figures | JHEP 1401, 161 (2014) | 10.1007/JHEP01(2014)161 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the implication of the LHC Higgs search results on the Type II Two
Higgs-Doublet Model. In particular, we explore the scenarios in which the
observed 126 GeV Higgs signal is interpreted as either the light CP-even Higgs
$h^0$ or the heavy CP-even Higgs $H^0$. Imposing both theoretical and
experimental constraints, we analyze the surviving parameter regions in $m_H$
($m_h$), $m_A$, $m_{H^\pm}$, $\tan\beta$ and $\sin(\beta - \alpha)$. We further
identify the regions that could accommodate a 126 GeV Higgs with cross sections
consistent with the observed Higgs signal. We find that in the $h^0$-126 case,
we are restricted to narrow regions of $\sin(\beta-\alpha) \approx \pm 1$ with
$\tan\beta$ up to 4, or an extended region with $0.55 < \sin(\beta-\alpha) <
0.9$ and $1.5 < \tan\beta < 4$. The values of $m_H$, $m_A$ and $m_{H^\pm}$,
however, are relatively unconstrained. In the $H^0$-126 case, we are restricted
to a narrow region of $\sin(\beta-\alpha) \sim 0$ with $\tan\beta$ up to about
8, or an extended region of $\sin(\beta-\alpha) $ between $-0.8$ to $-0.05$,
with $\tan\beta$ extended to 30 or higher. $m_A$ and $m_{H^\pm}$ are nearly
degenerate due to $\Delta\rho$ constraints. Imposing flavor constraints shrinks
the surviving parameter space significantly for the $H^0$-126 case, limiting
$\tan\beta \lesssim 10$, but has little effect in the $h^0$-126 case. We also
investigate the correlation between $\gamma\gamma$, $VV$ and $bb/\tau\tau$
channels. $\gamma\gamma$ and $VV$ channels are most likely to be highly
correlated with $\gamma\gamma:VV \sim 1$ for the normalized cross sections.
| [
{
"created": "Tue, 30 Apr 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2014 23:35:07 GMT",
"version": "v2"
}
] | 2014-03-18 | [
[
"Coleppa",
"Baradhwaj",
""
],
[
"Kling",
"Felix",
""
],
[
"Su",
"Shufang",
""
]
] | We study the implication of the LHC Higgs search results on the Type II Two Higgs-Doublet Model. In particular, we explore the scenarios in which the observed 126 GeV Higgs signal is interpreted as either the light CP-even Higgs $h^0$ or the heavy CP-even Higgs $H^0$. Imposing both theoretical and experimental constraints, we analyze the surviving parameter regions in $m_H$ ($m_h$), $m_A$, $m_{H^\pm}$, $\tan\beta$ and $\sin(\beta - \alpha)$. We further identify the regions that could accommodate a 126 GeV Higgs with cross sections consistent with the observed Higgs signal. We find that in the $h^0$-126 case, we are restricted to narrow regions of $\sin(\beta-\alpha) \approx \pm 1$ with $\tan\beta$ up to 4, or an extended region with $0.55 < \sin(\beta-\alpha) < 0.9$ and $1.5 < \tan\beta < 4$. The values of $m_H$, $m_A$ and $m_{H^\pm}$, however, are relatively unconstrained. In the $H^0$-126 case, we are restricted to a narrow region of $\sin(\beta-\alpha) \sim 0$ with $\tan\beta$ up to about 8, or an extended region of $\sin(\beta-\alpha) $ between $-0.8$ to $-0.05$, with $\tan\beta$ extended to 30 or higher. $m_A$ and $m_{H^\pm}$ are nearly degenerate due to $\Delta\rho$ constraints. Imposing flavor constraints shrinks the surviving parameter space significantly for the $H^0$-126 case, limiting $\tan\beta \lesssim 10$, but has little effect in the $h^0$-126 case. We also investigate the correlation between $\gamma\gamma$, $VV$ and $bb/\tau\tau$ channels. $\gamma\gamma$ and $VV$ channels are most likely to be highly correlated with $\gamma\gamma:VV \sim 1$ for the normalized cross sections. |
1207.2444 | Leonard Gamberg | Leonard Gamberg, Daniel Boer, Bernhard Musch, Alexei Prokudin | Bessel-weighted asymmetries and the Sivers effect | Proceedings of QNP 2012, 6th International Conference on Quarks and
Nuclear Physics, April 16-20, 2012, Ecole Polytechnique, Palaiseau, France | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the cross section in Fourier space, conjugate to the outgoing
hadron's transverse momentum, where convolutions of transverse momentum
dependent parton distribution functions and fragmentation functions become
simple products. Individual asymmetric terms in the cross section can be
projected out by means of a generalized set of weights involving Bessel
functions. Advantages of employing these Bessel weights are that they suppress
(divergent) contributions from high transverse momentum and that soft factors
cancel in (Bessel-) weighted asymmetries. Also, the resulting compact
expressions immediately connect to previous work on evolution equations for
transverse momentum dependent parton distribution and fragmentation functions
and to quantities accessible in lattice QCD. Bessel-weighted asymmetries are
thus model independent observables that augment the description and our
understanding of correlations of spin and momentum in nucleon structure.
| [
{
"created": "Tue, 10 Jul 2012 19:01:20 GMT",
"version": "v1"
}
] | 2012-07-11 | [
[
"Gamberg",
"Leonard",
""
],
[
"Boer",
"Daniel",
""
],
[
"Musch",
"Bernhard",
""
],
[
"Prokudin",
"Alexei",
""
]
] | We consider the cross section in Fourier space, conjugate to the outgoing hadron's transverse momentum, where convolutions of transverse momentum dependent parton distribution functions and fragmentation functions become simple products. Individual asymmetric terms in the cross section can be projected out by means of a generalized set of weights involving Bessel functions. Advantages of employing these Bessel weights are that they suppress (divergent) contributions from high transverse momentum and that soft factors cancel in (Bessel-) weighted asymmetries. Also, the resulting compact expressions immediately connect to previous work on evolution equations for transverse momentum dependent parton distribution and fragmentation functions and to quantities accessible in lattice QCD. Bessel-weighted asymmetries are thus model independent observables that augment the description and our understanding of correlations of spin and momentum in nucleon structure. |
1202.4012 | Bhupal Dev | P. S. Bhupal Dev, Bhaskar Dutta, R. N. Mohapatra, Matthew Severson | \theta_{13} and Proton Decay in a Minimal SO(10) x S_4 model of Flavor | 25 pages, 7 figures, 6 tables; version accepted for publication in
PRD | null | 10.1103/PhysRevD.86.035002 | UMD-PP-012-002, MIFPA-12-05 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, a minimal supersymmetric (SUSY) SO(10)xS_4 based unified
model of flavor for quarks and leptons was proposed with two 10 and one 126
contributing to fermion masses. An important aspect of this model is that
Yukawa couplings emerge dynamically from minimization of the flavon potential,
thereby reducing the number of parameters considerably. We make a detailed
numerical analysis of this model for fermion mixings including SUSY threshold
effects at the TeV scale and type-I corrections to a type-II dominant seesaw
for neutrino masses. This is a single-step breaking model with SUSY SO(10)
broken at the Grand Unified Theory (GUT)-scale of 2x10^16 GeV to the Minimal
Supersymmetric Standard Model (MSSM). The minimal model has only 11 parameters,
and therefore, the charged fermion fits predict the masses (up to an overall
scale) and mixings in the neutrino sector. We present correlations for the
different predictions in the neutrino mixing parameters. The recent
experimental "large" \theta_{13} value of \sim 9 degrees can be obtained by a
simple extension of the minimal model. We also find that proton decay mode p ->
K^+\bar{\nu}_\mu has a partial lifetime of \sim10^34 yrs, which is within reach
of the next round of planned proton decay searches. The successful fit for
fermion masses requires the Higgs mass to be below 129 GeV in this model. If
the Higgs mass lies between 120-128 GeV, as suggested by the recent LHC data,
we find a lower limit on the light stop mass of 755 (211) GeV for \mu>0 (<0).
| [
{
"created": "Fri, 17 Feb 2012 20:38:40 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2012 18:22:25 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jul 2012 03:34:22 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Mohapatra",
"R. N.",
""
],
[
"Severson",
"Matthew",
""
]
] | In a recent paper, a minimal supersymmetric (SUSY) SO(10)xS_4 based unified model of flavor for quarks and leptons was proposed with two 10 and one 126 contributing to fermion masses. An important aspect of this model is that Yukawa couplings emerge dynamically from minimization of the flavon potential, thereby reducing the number of parameters considerably. We make a detailed numerical analysis of this model for fermion mixings including SUSY threshold effects at the TeV scale and type-I corrections to a type-II dominant seesaw for neutrino masses. This is a single-step breaking model with SUSY SO(10) broken at the Grand Unified Theory (GUT)-scale of 2x10^16 GeV to the Minimal Supersymmetric Standard Model (MSSM). The minimal model has only 11 parameters, and therefore, the charged fermion fits predict the masses (up to an overall scale) and mixings in the neutrino sector. We present correlations for the different predictions in the neutrino mixing parameters. The recent experimental "large" \theta_{13} value of \sim 9 degrees can be obtained by a simple extension of the minimal model. We also find that proton decay mode p -> K^+\bar{\nu}_\mu has a partial lifetime of \sim10^34 yrs, which is within reach of the next round of planned proton decay searches. The successful fit for fermion masses requires the Higgs mass to be below 129 GeV in this model. If the Higgs mass lies between 120-128 GeV, as suggested by the recent LHC data, we find a lower limit on the light stop mass of 755 (211) GeV for \mu>0 (<0). |
0812.1532 | Brigitte Hiller | B. Hiller, J. Moreira, A. A. Osipov, A. H. Blin | The phase diagram for the Nambu--Jona-Lasinio model with 't Hooft and
eight-quark interactions | 12 pages, 4 figures, LaTeX, clarifying formulae included, detailed
description of Pauli-Villars regularization leading to correct asymptotics | Phys.Rev.D81:116005,2010 | 10.1103/PhysRevD.81.116005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the endpoint of the first order transition line which merges
into a crossover regime in the phase diagram of the Nambu--Jona-Lasinio model,
extended to include the six-quark 't Hooft and eight-quark interaction
Lagrangians, is pushed towards vanishing chemical potential and higher
temperatures with increasing strength of the OZI-violating eight-quark
interactions. We clarify the connection between the location of the endpoint in
the phase diagram and the mechanism of chiral symmetry breaking at the quark
level. We show how the 8q interactions affect the number of effective quark
degrees of freedom. We are able to obtain the correct asymptotics for this
number at large temperatures by using the Pauli-Villars regularization.
| [
{
"created": "Mon, 8 Dec 2008 18:22:20 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2010 14:10:19 GMT",
"version": "v2"
}
] | 2010-07-02 | [
[
"Hiller",
"B.",
""
],
[
"Moreira",
"J.",
""
],
[
"Osipov",
"A. A.",
""
],
[
"Blin",
"A. H.",
""
]
] | It is shown that the endpoint of the first order transition line which merges into a crossover regime in the phase diagram of the Nambu--Jona-Lasinio model, extended to include the six-quark 't Hooft and eight-quark interaction Lagrangians, is pushed towards vanishing chemical potential and higher temperatures with increasing strength of the OZI-violating eight-quark interactions. We clarify the connection between the location of the endpoint in the phase diagram and the mechanism of chiral symmetry breaking at the quark level. We show how the 8q interactions affect the number of effective quark degrees of freedom. We are able to obtain the correct asymptotics for this number at large temperatures by using the Pauli-Villars regularization. |
hep-ph/9312287 | J. W. F. Valle | Jos\'E W. F. Valle | Neutrino Mass Physics | 12 pages, latex, 8 figs. available by fax, FTUV/93-52, Invited Talk
at Third Workshop on Theory and Phenomenology of Underground Physics, TAUP93,
Gran Sasso, Sept. 1993, Italy. Expanded version of earlier talk at the Int.
School of Nuclear Physics, Erice, Italy, Sept. 1993 | Nucl.Phys.Proc.Suppl.35:309-320,1994 | 10.1016/0920-5632(94)90270-4 | null | hep-ph | null | Present limits on neutrino masses are briefly reviewed, along with
cosmological and astrophysical hints from dark matter, solar and atmospheric
neutrino observations that suggest neutrino masses. These would imply many
possible new phenomena such as neutrinoless $\beta\beta$ decay, lepton flavour
violating processes such as neutrino oscillations, $\mu \ra e \gamma$, $\mu \ra
3 e $, $\mu \ra e$ conversion in nuclei, as well as two-body decays with the
emission of a superweakly interacting spin zero particle, called majoron, e.g.
$\mu \ra e + J$. All of these processes may occur at levels consistent with
present or planned experimental sensitivities. The underlying physics may also
be probed at the high energies accessible at LEP, through related Z decay
processes. Another possible, albeit quite indirect, manifestation of massive
neutrinos is in Higgs physics. As an example I discuss the possibility of an
invisibly decaying Higgs, a quite generic feature of majoron models where the
lepton number is spontaneously violated close to the electroweak scale.
| [
{
"created": "Wed, 15 Dec 1993 11:40:00 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Valle",
"JosÉ W. F.",
""
]
] | Present limits on neutrino masses are briefly reviewed, along with cosmological and astrophysical hints from dark matter, solar and atmospheric neutrino observations that suggest neutrino masses. These would imply many possible new phenomena such as neutrinoless $\beta\beta$ decay, lepton flavour violating processes such as neutrino oscillations, $\mu \ra e \gamma$, $\mu \ra 3 e $, $\mu \ra e$ conversion in nuclei, as well as two-body decays with the emission of a superweakly interacting spin zero particle, called majoron, e.g. $\mu \ra e + J$. All of these processes may occur at levels consistent with present or planned experimental sensitivities. The underlying physics may also be probed at the high energies accessible at LEP, through related Z decay processes. Another possible, albeit quite indirect, manifestation of massive neutrinos is in Higgs physics. As an example I discuss the possibility of an invisibly decaying Higgs, a quite generic feature of majoron models where the lepton number is spontaneously violated close to the electroweak scale. |
hep-ph/0304212 | J. Lorenzo Diaz-Cruz | J.L. Diaz-Cruz and D.A. Lopez-Falcon | Probing the mechanism of EWSB with a rho parameter defined in terms of
Higgs couplings | 12 pages, 2 figures | Phys.Lett. B568 (2003) 245-253 | 10.1016/j.physletb.2003.06.047 | HEP-IFUAP-04-03 | hep-ph | null | A definition of the rho parameter based on the Higgs couplings with the gauge
bosons, rho_h= g_{hWW}}/c^2_W g_{hZZ}, is proposed as a new probe into the
origin of the mechanism of electroweak symmetry breaking. While $\rho_h=1$
holds in the SM, deviations from one are predicted in models with extended
Higgs sector.
We derive a general expresion of rho_h for a model with arbitrary Higgs
multiplets, and discuss its size within the context of specific models with
Higgs triplets, including the ``Little Higgs'' models recently proposed. We
find the even for Higgs models that incorporate the custodial symmetry to make
rho=1, one could have rho_h\neq 1, which could be tested at the level of a few
percent, with the precision Higgs meassurements expected at the NLC.
| [
{
"created": "Tue, 22 Apr 2003 23:20:14 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Diaz-Cruz",
"J. L.",
""
],
[
"Lopez-Falcon",
"D. A.",
""
]
] | A definition of the rho parameter based on the Higgs couplings with the gauge bosons, rho_h= g_{hWW}}/c^2_W g_{hZZ}, is proposed as a new probe into the origin of the mechanism of electroweak symmetry breaking. While $\rho_h=1$ holds in the SM, deviations from one are predicted in models with extended Higgs sector. We derive a general expresion of rho_h for a model with arbitrary Higgs multiplets, and discuss its size within the context of specific models with Higgs triplets, including the ``Little Higgs'' models recently proposed. We find the even for Higgs models that incorporate the custodial symmetry to make rho=1, one could have rho_h\neq 1, which could be tested at the level of a few percent, with the precision Higgs meassurements expected at the NLC. |
hep-ph/0412232 | Alexander E. Dorokhov | A.E. Dorokhov | Vector and axial-vector current correlators within the instanton model
of QCD vacuum | 5 pages, 1 figure, talk given at the 16th Intern. Spin Physics
Symposium, SPIN2004, Trieste, Italy (October 10-16, 2004) | null | 10.1142/9789812701909_0034 | null | hep-ph | null | The pion electric polarizability, \alpha^E_\pi^\pm, the leading order
hadronic contribution to the muon anomalous magnetic moment, $a_\mu^{hvp 1} $,
and the ratio of the difference to the sum of vector and axial-vector
correlators, (V-A)/(V+A), are found within the instanton model of QCD vacuum.
The results are compared with phenomenological estimates of these quantities
following from the ALEPH and OPAL data on vector and axial-vector spectral
densities.
| [
{
"created": "Thu, 16 Dec 2004 12:53:25 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Dorokhov",
"A. E.",
""
]
] | The pion electric polarizability, \alpha^E_\pi^\pm, the leading order hadronic contribution to the muon anomalous magnetic moment, $a_\mu^{hvp 1} $, and the ratio of the difference to the sum of vector and axial-vector correlators, (V-A)/(V+A), are found within the instanton model of QCD vacuum. The results are compared with phenomenological estimates of these quantities following from the ALEPH and OPAL data on vector and axial-vector spectral densities. |
1212.4408 | Bastian Kubis | J. T. Daub, H. K. Dreiner, C. Hanhart, B. Kubis, U.-G. Mei{\ss}ner | Improving the Hadron Physics of Non-Standard-Model Decays: Example
Bounds on R-parity Violation | 18 pages, 3 figures | JHEP 1301:179,2013 | 10.1007/JHEP01(2013)179 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the example of selected decays driven by R-parity-violating
supersymmetric operators, we demonstrate how strong final-state interactions
can be controlled quantitatively with high precision, thus allowing for a more
accurate extraction of effective parameters from data. In our examples we focus
on the lepton-flavor-violating decays tau --> mu pi+ pi-. In R-parity violation
these can arise due to the product of two couplings. We find bounds that are an
order of magnitude stronger than previous ones.
| [
{
"created": "Tue, 18 Dec 2012 16:18:24 GMT",
"version": "v1"
}
] | 2013-02-04 | [
[
"Daub",
"J. T.",
""
],
[
"Dreiner",
"H. K.",
""
],
[
"Hanhart",
"C.",
""
],
[
"Kubis",
"B.",
""
],
[
"Meißner",
"U. -G.",
""
]
] | Using the example of selected decays driven by R-parity-violating supersymmetric operators, we demonstrate how strong final-state interactions can be controlled quantitatively with high precision, thus allowing for a more accurate extraction of effective parameters from data. In our examples we focus on the lepton-flavor-violating decays tau --> mu pi+ pi-. In R-parity violation these can arise due to the product of two couplings. We find bounds that are an order of magnitude stronger than previous ones. |
1904.07127 | Benjamin Roberts | B. M. Roberts and V. V. Flambaum | Electron-interacting dark matter: Implications from DAMA/LIBRA-phase2
and prospects for liquid xenon detectors and NaI detectors | null | Phys. Rev. D 100, 063017 (2019) | 10.1103/PhysRevD.100.063017 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility for the direct detection of low mass (GeV
scale) WIMP dark matter in scintillation experiments. Such WIMPs are typically
too light to leave appreciable nuclear recoils, but may be detected via their
scattering off atomic electrons. In particular, the DAMA Collaboration [R.
Bernabei et al., Nucl. Phys. At. Energy 19, 307 (2018)] has recently presented
strong evidence of an annual modulation in the scintillation rate observed at
energies as low as 1 keV. Despite a strong enhancement in the calculated event
rate at low energies, we find that an interpretation in terms of
electron-interacting WIMPs cannot be consistent with existing constraints. We
also demonstrate the importance of correct treatment of the atomic
wavefunctions, and show the resulting event rate is very sensitive to the
low-energy performance of the detectors, meaning it is crucial that the
detector uncertainties be taken into account. Finally, we demonstrate that the
potential scintillation event rate can be much larger than may otherwise be
expected, meaning that competitive searches can be performed for GeV scale
WIMPs using the conventional prompt S1 scintillation signals. This is important
given the recent and upcoming very large liquid xenon detectors.
| [
{
"created": "Mon, 15 Apr 2019 15:33:08 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 2019 02:18:31 GMT",
"version": "v2"
}
] | 2019-10-09 | [
[
"Roberts",
"B. M.",
""
],
[
"Flambaum",
"V. V.",
""
]
] | We investigate the possibility for the direct detection of low mass (GeV scale) WIMP dark matter in scintillation experiments. Such WIMPs are typically too light to leave appreciable nuclear recoils, but may be detected via their scattering off atomic electrons. In particular, the DAMA Collaboration [R. Bernabei et al., Nucl. Phys. At. Energy 19, 307 (2018)] has recently presented strong evidence of an annual modulation in the scintillation rate observed at energies as low as 1 keV. Despite a strong enhancement in the calculated event rate at low energies, we find that an interpretation in terms of electron-interacting WIMPs cannot be consistent with existing constraints. We also demonstrate the importance of correct treatment of the atomic wavefunctions, and show the resulting event rate is very sensitive to the low-energy performance of the detectors, meaning it is crucial that the detector uncertainties be taken into account. Finally, we demonstrate that the potential scintillation event rate can be much larger than may otherwise be expected, meaning that competitive searches can be performed for GeV scale WIMPs using the conventional prompt S1 scintillation signals. This is important given the recent and upcoming very large liquid xenon detectors. |
1806.08090 | Andrej Arbuzov | A.B. Arbuzov, T.V. Kopylova, I.K. Sklyarov | On spin asymmetry in muon and tau decays | 8 pages, version to appear in IJMPA | International Journal of Modern Physics A, Vol. 33 (2018) 1850191 | 10.1142/S0217751X18501919 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The angular asymmetry in decays of polarized muons and tau leptons is
discussed. Both the standard $V-A$ Fermi model and the general parameterization
via Michel parameters are considered. Numerical importance of contributions
suppressed by charged lepton mass ratio is underlined. Contribution of the
second order QED correction is estimated in the leading logarithm
approximation.
| [
{
"created": "Thu, 21 Jun 2018 07:13:59 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2018 14:21:15 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Nov 2018 08:21:44 GMT",
"version": "v3"
}
] | 2018-11-15 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Kopylova",
"T. V.",
""
],
[
"Sklyarov",
"I. K.",
""
]
] | The angular asymmetry in decays of polarized muons and tau leptons is discussed. Both the standard $V-A$ Fermi model and the general parameterization via Michel parameters are considered. Numerical importance of contributions suppressed by charged lepton mass ratio is underlined. Contribution of the second order QED correction is estimated in the leading logarithm approximation. |
2405.08482 | Pedro De La Torre Luque | Pedro De la Torre Luque, Shyam Balaji, Pierluca Carenza, Leonardo
Mastrototaro | $\gamma$ rays from in-flight positron annihilation as a probe of new
physics | 6 pages, 3 figures, no appendices. Comments are welcome! | null | null | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The $\gamma$ ray emission originating from in-flight annihilation (IA) of
positrons is a powerful observable for constraining high-energy positron
production from exotic sources. By comparing diffuse $\gamma$ ray observations
of INTEGRAL, COMPTEL and EGRET to theoretical predictions, we set the most
stringent constraints on electrophilic feebly interacting particles (FIPs),
thereby proving IA as a valuable probe of new physics. In particular, we
extensively discuss the case of MeV-scale sterile neutrinos, where IA sets the
most stringent constraints, excluding $|U_{\mu4}|^{2} \gtrsim 10^{-13}$ and
$|U_{\tau4}|^{2} \gtrsim 2\times 10^{-13}$ for sterile neutrinos mixed with
$\mu$ and $\tau$ neutrinos respectively. These constraints improve existing
limits by more than an order of magnitude. We briefly discuss the application
of these results to a host of exotic positron sources such as dark photons,
axion-like particles, primordial black holes (PBHs) and sub-GeV dark matter
(DM).
| [
{
"created": "Tue, 14 May 2024 10:09:37 GMT",
"version": "v1"
}
] | 2024-05-15 | [
[
"Luque",
"Pedro De la Torre",
""
],
[
"Balaji",
"Shyam",
""
],
[
"Carenza",
"Pierluca",
""
],
[
"Mastrototaro",
"Leonardo",
""
]
] | The $\gamma$ ray emission originating from in-flight annihilation (IA) of positrons is a powerful observable for constraining high-energy positron production from exotic sources. By comparing diffuse $\gamma$ ray observations of INTEGRAL, COMPTEL and EGRET to theoretical predictions, we set the most stringent constraints on electrophilic feebly interacting particles (FIPs), thereby proving IA as a valuable probe of new physics. In particular, we extensively discuss the case of MeV-scale sterile neutrinos, where IA sets the most stringent constraints, excluding $|U_{\mu4}|^{2} \gtrsim 10^{-13}$ and $|U_{\tau4}|^{2} \gtrsim 2\times 10^{-13}$ for sterile neutrinos mixed with $\mu$ and $\tau$ neutrinos respectively. These constraints improve existing limits by more than an order of magnitude. We briefly discuss the application of these results to a host of exotic positron sources such as dark photons, axion-like particles, primordial black holes (PBHs) and sub-GeV dark matter (DM). |
1911.01427 | Ivan Esteban | Mona Dentler, Ivan Esteban, Joachim Kopp, Pedro Machado | Decaying Sterile Neutrinos and the Short Baseline Oscillation Anomalies | 5 pages, 4 figures + appendices. Matches published version | Phys. Rev. D 101, 115013 (2020) | 10.1103/PhysRevD.101.115013 | FERMILAB-PUB-19-538-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The MiniBooNE experiment has observed a significant excess of electron
neutrinos in a muon neutrino beam at source-detector distances too short to be
compatible with standard neutrino oscillations. The most straightforward
explanation for this signal in terms of oscillations between Standard Model
neutrinos and a new, sterile, neutrino, is disfavored by null results from
experiments looking for muon neutrino disappearance. Here, we discuss the
possibility that MiniBooNE data are instead explained by a sterile neutrino
that decays quickly back into active neutrinos plus a light boson. The flavor
composition of the secondary neutrinos is determined by the sterile neutrino
mixing angles, and we show that the data is best explained if the sterile
neutrino mixes mostly with electron neutrinos. The preferred range for the mass
of the sterile neutrino is between 100 eV and 1 keV. We argue that the model
can easily satisfy cosmological constraints because it has the "secret
interactions" mechanism built-in. Accommodating in addition to the MiniBooNE
anomaly also the LSND, reactor, and gallium anomalies is possible, but in this
case the model needs to be extended to avoid cosmological limits.
| [
{
"created": "Mon, 4 Nov 2019 19:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 2020 10:13:02 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"Dentler",
"Mona",
""
],
[
"Esteban",
"Ivan",
""
],
[
"Kopp",
"Joachim",
""
],
[
"Machado",
"Pedro",
""
]
] | The MiniBooNE experiment has observed a significant excess of electron neutrinos in a muon neutrino beam at source-detector distances too short to be compatible with standard neutrino oscillations. The most straightforward explanation for this signal in terms of oscillations between Standard Model neutrinos and a new, sterile, neutrino, is disfavored by null results from experiments looking for muon neutrino disappearance. Here, we discuss the possibility that MiniBooNE data are instead explained by a sterile neutrino that decays quickly back into active neutrinos plus a light boson. The flavor composition of the secondary neutrinos is determined by the sterile neutrino mixing angles, and we show that the data is best explained if the sterile neutrino mixes mostly with electron neutrinos. The preferred range for the mass of the sterile neutrino is between 100 eV and 1 keV. We argue that the model can easily satisfy cosmological constraints because it has the "secret interactions" mechanism built-in. Accommodating in addition to the MiniBooNE anomaly also the LSND, reactor, and gallium anomalies is possible, but in this case the model needs to be extended to avoid cosmological limits. |
0912.1309 | Lorenzo Calibbi | Andrzej J. Buras, Lorenzo Calibbi, Paride Paradisi | Slepton mass-splittings as a signal of LFV at the LHC | 11 pages, 5 figures. v2: added discussion on backgrounds, added
references, version to be published on JHEP | JHEP 1006:042,2010 | 10.1007/JHEP06(2010)042 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precise measurements of slepton mass-splittings might represent a powerful
tool to probe supersymmetric (SUSY) lepton flavour violation (LFV) at the LHC.
We point out that mass-splittings of the first two generations of sleptons are
especially sensitive to LFV effects involving $\tau-\mu$ transitions. If these
mass-splittings are LFV induced, high-energy LFV processes like the neutralino
decay ${\nt}_2\to\nt_1\tau^{\pm}\mu^{\mp}$ as well as low-energy LFV processes
like $\tau\to\mu\gamma$ are unavoidable. We show that precise slepton
mass-splitting measurements and LFV processes both at the high- and low-energy
scales are highly complementary in the attempt to (partially) reconstruct the
flavour sector of the SUSY model at work. The present study represents another
proof of the synergy and interplay existing between the LHC, i.e. the {\em
high-energy frontier}, and high-precision low-energy experiments, i.e. the {\em
high-intensity frontier}.
| [
{
"created": "Mon, 7 Dec 2009 19:11:06 GMT",
"version": "v1"
},
{
"created": "Thu, 27 May 2010 09:10:37 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Calibbi",
"Lorenzo",
""
],
[
"Paradisi",
"Paride",
""
]
] | Precise measurements of slepton mass-splittings might represent a powerful tool to probe supersymmetric (SUSY) lepton flavour violation (LFV) at the LHC. We point out that mass-splittings of the first two generations of sleptons are especially sensitive to LFV effects involving $\tau-\mu$ transitions. If these mass-splittings are LFV induced, high-energy LFV processes like the neutralino decay ${\nt}_2\to\nt_1\tau^{\pm}\mu^{\mp}$ as well as low-energy LFV processes like $\tau\to\mu\gamma$ are unavoidable. We show that precise slepton mass-splitting measurements and LFV processes both at the high- and low-energy scales are highly complementary in the attempt to (partially) reconstruct the flavour sector of the SUSY model at work. The present study represents another proof of the synergy and interplay existing between the LHC, i.e. the {\em high-energy frontier}, and high-precision low-energy experiments, i.e. the {\em high-intensity frontier}. |
hep-ph/9310335 | Kurt Langfeld | R. F. Langbein, K. Langfeld, H. Reinhardt, L. v. Smekal | Natural Slow-Roll Inflation | 14 LaTex pages (3 figures available on request), UNITUE-THEP-15-1993 | Mod.Phys.Lett.A11:631-646,1996 | 10.1142/S0217732396000655 | null | hep-ph | null | It is shown that the non-perturbative dynamics of a phase change to the
non-trivial phase of $\lambda\varphi^4$-theory in the early universe can give
rise to slow-rollover inflation without recourse to unnaturally small
couplings.
| [
{
"created": "Fri, 22 Oct 1993 07:45:48 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Langbein",
"R. F.",
""
],
[
"Langfeld",
"K.",
""
],
[
"Reinhardt",
"H.",
""
],
[
"Smekal",
"L. v.",
""
]
] | It is shown that the non-perturbative dynamics of a phase change to the non-trivial phase of $\lambda\varphi^4$-theory in the early universe can give rise to slow-rollover inflation without recourse to unnaturally small couplings. |
1812.08454 | Emilio Royo | Rafel Escribano, Sergi Gonz\`alez-Sol\'is, Renata Jora and Emilio Royo | A theoretical analysis of the doubly radiative decays
$\eta^{(\prime)}\to\pi^0\gamma\gamma$ and $\eta^\prime\to\eta\gamma\gamma$ | 16 pages, 4 figures, 2 tables; v2: includes experimental measurement
for the $\eta^\prime\to\eta\gamma\gamma$, a better treatment for the $\sigma$
propagator and a new discussion on the values of the $VP\gamma$ couplings | Phys. Rev. D 102, 034026 (2020) | 10.1103/PhysRevD.102.034026 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scalar and vector meson exchange contributions to the doubly radiative
decays $\eta^{(\prime)}\to\pi^0\gamma\gamma$ and
$\eta^\prime\to\eta\gamma\gamma$ are analysed within the Linear Sigma Model and
Vector Meson Dominance frameworks, respectively. Predictions for the diphoton
invariant mass spectra and the associated integrated branching ratios are given
and compared with current available experimental data. Whilst a satisfactory
description of the shape of the $\eta\to\pi^{0}\gamma\gamma$ and
$\eta^\prime\to\pi^{0}\gamma\gamma$ decay spectra is obtained, thus supporting
the validity of the approach, the corresponding branching ratios cannot be
reproduced simultaneously. A first theoretical prediction for the recently
measured $\eta^\prime\to\eta\gamma\gamma$ by the BESIII collaboration is also
presented.
| [
{
"created": "Thu, 20 Dec 2018 10:07:44 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2020 07:48:05 GMT",
"version": "v2"
}
] | 2020-09-02 | [
[
"Escribano",
"Rafel",
""
],
[
"Gonzàlez-Solís",
"Sergi",
""
],
[
"Jora",
"Renata",
""
],
[
"Royo",
"Emilio",
""
]
] | The scalar and vector meson exchange contributions to the doubly radiative decays $\eta^{(\prime)}\to\pi^0\gamma\gamma$ and $\eta^\prime\to\eta\gamma\gamma$ are analysed within the Linear Sigma Model and Vector Meson Dominance frameworks, respectively. Predictions for the diphoton invariant mass spectra and the associated integrated branching ratios are given and compared with current available experimental data. Whilst a satisfactory description of the shape of the $\eta\to\pi^{0}\gamma\gamma$ and $\eta^\prime\to\pi^{0}\gamma\gamma$ decay spectra is obtained, thus supporting the validity of the approach, the corresponding branching ratios cannot be reproduced simultaneously. A first theoretical prediction for the recently measured $\eta^\prime\to\eta\gamma\gamma$ by the BESIII collaboration is also presented. |
1912.11332 | Tomohiro Abe | Tomohiro Abe, K. S. Babu | Simple Theory of Chiral Fermion Dark Matter | 29 pages, 8 figures; Version published in Physical Review D | Phys. Rev. D 103, 015031 (2021) | 10.1103/PhysRevD.103.015031 | OSU-HEP-19-10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a theory of chiral fermion dark matter (DM) with an isospin-3/2
fermion of a dark sector $SU(2)_D$ gauge symmetry, which is arguably the
simplest chiral theory. An isospin-3 scalar breaks $SU(2)_D$ down to a discrete
non-Abelian group $T'$ and generates the DM mass. The $SU(2)_D$ gauge symmetry
protects the DM mass and guarantees its stability. We derive consistency
conditions for the theory and study its DM phenomenology. In some regions of
parameters of the theory a two-component DM scenario is realized, consisting of
a fermion and a boson, with the boson being the lightest $T'$ nonsinglet field.
In the case of single component fermionic DM, we find that internal consistency
of the theory, perturbativity arguments, and the observed relic abundance limit
the DM mass to be less than $280$ GeV, except when $s$-channel resonance
regions are open for annihilation. For a significant part of the parameter
space, the theory can be tested in DM direct detection signals at the LZ and
XENONnT experiments.
| [
{
"created": "Tue, 24 Dec 2019 13:09:23 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jan 2021 12:15:49 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Abe",
"Tomohiro",
""
],
[
"Babu",
"K. S.",
""
]
] | We propose a theory of chiral fermion dark matter (DM) with an isospin-3/2 fermion of a dark sector $SU(2)_D$ gauge symmetry, which is arguably the simplest chiral theory. An isospin-3 scalar breaks $SU(2)_D$ down to a discrete non-Abelian group $T'$ and generates the DM mass. The $SU(2)_D$ gauge symmetry protects the DM mass and guarantees its stability. We derive consistency conditions for the theory and study its DM phenomenology. In some regions of parameters of the theory a two-component DM scenario is realized, consisting of a fermion and a boson, with the boson being the lightest $T'$ nonsinglet field. In the case of single component fermionic DM, we find that internal consistency of the theory, perturbativity arguments, and the observed relic abundance limit the DM mass to be less than $280$ GeV, except when $s$-channel resonance regions are open for annihilation. For a significant part of the parameter space, the theory can be tested in DM direct detection signals at the LZ and XENONnT experiments. |
hep-ph/9709455 | Gunther Piller | J. Edelmann, G. Piller and W. Weise | Deuteron Spin Structure Functions at Small Bjorken-x | 30 pages, Revtex, include discussion on t-dependence of diffractive
production processes, to appear in Phys. Rev. C | Phys.Rev.C57:3392-3405,1998 | 10.1103/PhysRevC.57.3392 | TUM-T39-97-15 | hep-ph | null | We investigate polarized deuteron structure functions at small values of the
Bjorken variable, x < 0.1. In this region contributions from the coherent
interaction of diffractively excited hadronic states with both nucleons become
important. A proper treatment of this process requires an extension of the
Glauber-Gribov multiple scattering theory to include spin degrees of freedom.
In the kinematic domain of current fixed target experiments we observe that
shadowing effects in g_1d are approximately twice as large as for the
unpolarized structure function F_2d. Furthermore at x < 0.1 the tensor
structure function b_1 is found to receive significant contributions from
coherent double scattering.
| [
{
"created": "Thu, 25 Sep 1997 12:51:49 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Mar 1998 14:51:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Edelmann",
"J.",
""
],
[
"Piller",
"G.",
""
],
[
"Weise",
"W.",
""
]
] | We investigate polarized deuteron structure functions at small values of the Bjorken variable, x < 0.1. In this region contributions from the coherent interaction of diffractively excited hadronic states with both nucleons become important. A proper treatment of this process requires an extension of the Glauber-Gribov multiple scattering theory to include spin degrees of freedom. In the kinematic domain of current fixed target experiments we observe that shadowing effects in g_1d are approximately twice as large as for the unpolarized structure function F_2d. Furthermore at x < 0.1 the tensor structure function b_1 is found to receive significant contributions from coherent double scattering. |
1204.1951 | Kei Yagyu | Mayumi Aoki, Shinya Kanemura, Mariko Kikuchi, Kei Yagyu | Renormalization of the Higgs sector in the triplet model | Published version in Physics Letters B | null | 10.1016/j.physletb.2012.07.016 | KANAZAWA-12-04; UT-HET 067 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study radiative corrections to the mass spectrum and the triple Higgs
boson coupling in the model with an additional Y=1 triplet field. In this
model, the vacuum expectation value for the triplet field is strongly
constrained from the electroweak precision data, under which characteristic
mass spectrum appear at the tree level; i.e., $m_{H^{++}}^2-m_{H^+}^2\simeq
m_{H^+}^2-m_A^2$ and $m_A^2\simeq m_H^2$, where the CP-even ($H$), the CP-odd
($A$) and the doubly-charged ($H^{\pm\pm}$) as well as the singly-charged
($H^\pm$) Higgs bosons are the triplet-like. We evaluate how the tree-level
formulae are modified at the one-loop level. The $hhh$ coupling for the
standard model-like Higgs boson ($h$) is also calculated at the one-loop level.
One-loop corrections to these quantities can be large enough for identification
of the model by future precision data at the LHC or the International Linear
Collider.
| [
{
"created": "Mon, 9 Apr 2012 18:51:12 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Aug 2012 21:16:24 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Aoki",
"Mayumi",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Kikuchi",
"Mariko",
""
],
[
"Yagyu",
"Kei",
""
]
] | We study radiative corrections to the mass spectrum and the triple Higgs boson coupling in the model with an additional Y=1 triplet field. In this model, the vacuum expectation value for the triplet field is strongly constrained from the electroweak precision data, under which characteristic mass spectrum appear at the tree level; i.e., $m_{H^{++}}^2-m_{H^+}^2\simeq m_{H^+}^2-m_A^2$ and $m_A^2\simeq m_H^2$, where the CP-even ($H$), the CP-odd ($A$) and the doubly-charged ($H^{\pm\pm}$) as well as the singly-charged ($H^\pm$) Higgs bosons are the triplet-like. We evaluate how the tree-level formulae are modified at the one-loop level. The $hhh$ coupling for the standard model-like Higgs boson ($h$) is also calculated at the one-loop level. One-loop corrections to these quantities can be large enough for identification of the model by future precision data at the LHC or the International Linear Collider. |
0711.3086 | Hisaki Hatanaka | Hisaki Hatanaka and Kwei-Chou Yang | Pseudoscalar and Scalar Operators of Higgs-Penguins in the MSSM and B to
phi K^*, K eta(') Decays | 27 pages, 3 figures; (v2) data and results updated, typos corrected | Phys.Rev.D77:035013,2008 | 10.1103/PhysRevD.77.035013 | null | hep-ph | null | We study the effect of b to s sbar s scalar/pseudoscalar operators in B to K
eta('), phi K^* decays. In the minimal supersymmetric standard model (MSSM),
such scalar/pseudoscalar operators can be induced by the penguin diagrams of
neutral Higgs bosons. These operators can be Fierz-transformed into tensor
operators, and the resultant tensor operators could affect the transverse
polarization amplitudes in B to phi K^* decays. A combined analysis of the
decays B to phi K^* and B to K eta('), including b to s sbar s
scalar/pseudoscalar operators and their Fierz-transformed tensor operators
originated from the MSSM, is performed. Our study is based on the followings:
(1) Assuming that weak annihilations in B to phi K^* is negligible and the
polarization puzzle is resolved by Fierz-transformed tensor operators, it
results in too large coefficients of scalar/pseudoscalar operators, such that
the resulting B to K eta(') branching fractions are much larger than
observations. (2) When we take the weak annihilations in B to phi K^* into
account, the polarization puzzle can be resolved. In this case, new physics
effects are strongly suppressed and no more relevant to the enhancement of the
transverse modes in B to phi K^* decays.
| [
{
"created": "Tue, 20 Nov 2007 11:31:56 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2007 16:14:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hatanaka",
"Hisaki",
""
],
[
"Yang",
"Kwei-Chou",
""
]
] | We study the effect of b to s sbar s scalar/pseudoscalar operators in B to K eta('), phi K^* decays. In the minimal supersymmetric standard model (MSSM), such scalar/pseudoscalar operators can be induced by the penguin diagrams of neutral Higgs bosons. These operators can be Fierz-transformed into tensor operators, and the resultant tensor operators could affect the transverse polarization amplitudes in B to phi K^* decays. A combined analysis of the decays B to phi K^* and B to K eta('), including b to s sbar s scalar/pseudoscalar operators and their Fierz-transformed tensor operators originated from the MSSM, is performed. Our study is based on the followings: (1) Assuming that weak annihilations in B to phi K^* is negligible and the polarization puzzle is resolved by Fierz-transformed tensor operators, it results in too large coefficients of scalar/pseudoscalar operators, such that the resulting B to K eta(') branching fractions are much larger than observations. (2) When we take the weak annihilations in B to phi K^* into account, the polarization puzzle can be resolved. In this case, new physics effects are strongly suppressed and no more relevant to the enhancement of the transverse modes in B to phi K^* decays. |
2209.14659 | Gioacchino Piazza | Gioacchino Piazza, Asmaa Abada, Pablo Escribano, Xabier Marcano | Heavy Neutral Leptons Beyond Simplified Scenarios | 4 pages, 2 figures, Contribution to the 2022 EW session of the 56th
Rencontres de Moriond. Based on arxiv:2208.13882 [hep-ph] | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Heavy neutral leptons (HNL) constitute the building blocks of several
neutrino mass generation mechanisms. Experimental searches depend on their
masses and mixings with the active neutrinos, and exclusion regions in the
plane of mass and mixing rely most of the time on two assumptions: $(i)$ the
existence of $one$ HNL, which $(ii)$ mixes dominantly with only $one$ lepton
flavor. In this work we discuss how to reinterpret the limits from collider
searches relaxing these assumptions, providing a simple recipe to recast the
bounds in models with generic mixing patterns, and in which at least two HNLs
are coupled to the active sector.
| [
{
"created": "Thu, 29 Sep 2022 09:45:41 GMT",
"version": "v1"
}
] | 2022-09-30 | [
[
"Piazza",
"Gioacchino",
""
],
[
"Abada",
"Asmaa",
""
],
[
"Escribano",
"Pablo",
""
],
[
"Marcano",
"Xabier",
""
]
] | Heavy neutral leptons (HNL) constitute the building blocks of several neutrino mass generation mechanisms. Experimental searches depend on their masses and mixings with the active neutrinos, and exclusion regions in the plane of mass and mixing rely most of the time on two assumptions: $(i)$ the existence of $one$ HNL, which $(ii)$ mixes dominantly with only $one$ lepton flavor. In this work we discuss how to reinterpret the limits from collider searches relaxing these assumptions, providing a simple recipe to recast the bounds in models with generic mixing patterns, and in which at least two HNLs are coupled to the active sector. |
2003.03894 | En Wang | Guan-Ying Wang, Man-Yu Duan, En Wang, and De-Min Li | Enhancement near the $\bar{p}\Lambda$ threshold in the $\chi_{c0}\to
\bar{p}K^+\Lambda$ reaction | 9 pages, 7 figures, the version to be presented in PRD | Phys. Rev. D 102, 036003 (2020) | 10.1103/PhysRevD.102.036003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have analyzed the reaction $\chi_{c0}\to \bar{p} K^+\Lambda$ reported by
the BESIII Collaboration, taking into account the contributions from the
intermediate $K(1830)$, $N(2300)$, and $\Lambda(1520)$ resonances. Our results
are in good agreement with the BESIII measurements, and it is found that the
anomalous enhancement near the $\bar{p}\Lambda$ threshold is mainly due to the
contribution of the $K(1830)$ resonance. We also show that the interference of
the high-mass $N^*$ and $\Lambda^*$ can not produce the anomalous enhancement
near the $\bar{p}\Lambda$ threshold.
| [
{
"created": "Mon, 9 Mar 2020 02:37:08 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2020 22:54:55 GMT",
"version": "v2"
}
] | 2020-08-12 | [
[
"Wang",
"Guan-Ying",
""
],
[
"Duan",
"Man-Yu",
""
],
[
"Wang",
"En",
""
],
[
"Li",
"De-Min",
""
]
] | We have analyzed the reaction $\chi_{c0}\to \bar{p} K^+\Lambda$ reported by the BESIII Collaboration, taking into account the contributions from the intermediate $K(1830)$, $N(2300)$, and $\Lambda(1520)$ resonances. Our results are in good agreement with the BESIII measurements, and it is found that the anomalous enhancement near the $\bar{p}\Lambda$ threshold is mainly due to the contribution of the $K(1830)$ resonance. We also show that the interference of the high-mass $N^*$ and $\Lambda^*$ can not produce the anomalous enhancement near the $\bar{p}\Lambda$ threshold. |
hep-ph/0209320 | Francesco Hautmann | F. Hautmann | Diffractive jet production in lepton-hadron collisions | 16 pages, 4 figures | JHEP 0210 (2002) 025 | 10.1088/1126-6708/2002/10/025 | null | hep-ph | null | We study jet final states in diffractive deep-inelastic scattering. We
present the QCD factorization formula in terms of diffractive parton
distributions and discuss its implementation in NLO Monte Carlo generators. We
compute NLO predictions for the diffractive jet cross section. We use this
calculational framework to discuss theoretical models of the long-distance
behavior.
| [
{
"created": "Thu, 26 Sep 2002 17:57:13 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hautmann",
"F.",
""
]
] | We study jet final states in diffractive deep-inelastic scattering. We present the QCD factorization formula in terms of diffractive parton distributions and discuss its implementation in NLO Monte Carlo generators. We compute NLO predictions for the diffractive jet cross section. We use this calculational framework to discuss theoretical models of the long-distance behavior. |
1205.4042 | Jorge Eduardo Cieza Montalvo | J. E. Cieza Montalvo, R. J. Gil Ram\'irez, G. H. Ram\'irez Ulloa, A.
I. Rivasplata Mendoza | Neutral 3-3-1 Higgs Bosons at LHC | 27 pages 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of production and signature of neutral Higgs bosons on
the version of the 3-3-1 model containing heavy leptons at the Large Hadron
Collider (LHC). The production rate is found to be significant with a clear
signature ($\sqrt{s}=14$) TeV, showing that these scalars can be detected in
this accelerator. We also studied the possibility to identify them using their
respective branching ratios. Cross section are given for two collider energies,
$\sqrt{s} =$ 8 TeV and 14 TeV. Event rates and significances are discussed for
two possible values of integrated luminosity, 10 fb$^{-1}$ and 300 fb$^{-1}$.
| [
{
"created": "Thu, 17 May 2012 20:47:36 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2013 18:12:10 GMT",
"version": "v2"
}
] | 2013-05-16 | [
[
"Montalvo",
"J. E. Cieza",
""
],
[
"Ramírez",
"R. J. Gil",
""
],
[
"Ulloa",
"G. H. Ramírez",
""
],
[
"Mendoza",
"A. I. Rivasplata",
""
]
] | We present an analysis of production and signature of neutral Higgs bosons on the version of the 3-3-1 model containing heavy leptons at the Large Hadron Collider (LHC). The production rate is found to be significant with a clear signature ($\sqrt{s}=14$) TeV, showing that these scalars can be detected in this accelerator. We also studied the possibility to identify them using their respective branching ratios. Cross section are given for two collider energies, $\sqrt{s} =$ 8 TeV and 14 TeV. Event rates and significances are discussed for two possible values of integrated luminosity, 10 fb$^{-1}$ and 300 fb$^{-1}$. |
2206.07928 | Yang Bai | Yang Bai, Joshua Berger, Mrunal Korwar | IceCube at the Frontier of Macroscopic Dark Matter Direct Detection | 16 pages, 8 figures, 1 table | null | 10.1007/JHEP11(2022)079 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a class of macroscopic dark matter models, inelastic scattering of dark
matter off a nucleus can generate electromagnetic signatures with GeV-scale
energy. The IceCube detector, with its kilometer-scale size, is ideal for
directly detecting such inelastic scattering. Based on the slow particle
trigger for the DeepCore detector, we perform a detailed signal and background
simulation to estimate the discovery potential. For order 1 GeV deposited
energy in each interaction, we find that IceCube can probe the dark matter
masses up to one gram.
| [
{
"created": "Thu, 16 Jun 2022 05:22:02 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Bai",
"Yang",
""
],
[
"Berger",
"Joshua",
""
],
[
"Korwar",
"Mrunal",
""
]
] | For a class of macroscopic dark matter models, inelastic scattering of dark matter off a nucleus can generate electromagnetic signatures with GeV-scale energy. The IceCube detector, with its kilometer-scale size, is ideal for directly detecting such inelastic scattering. Based on the slow particle trigger for the DeepCore detector, we perform a detailed signal and background simulation to estimate the discovery potential. For order 1 GeV deposited energy in each interaction, we find that IceCube can probe the dark matter masses up to one gram. |
hep-ph/0108079 | Xavier Calmet | Xavier Calmet | Radiative Lepton Decays and the Substructure of Leptons | 5 pages, to appear in the proceedings of the International
Europhysics Conference on High Energy Physics, July 12-18 2001, Budapest | null | null | LMU 01/09 | hep-ph | null | The leptons are viewed as composite objects, exhibiting anomalous magnetic
moments and anomalous flavor-changing transition moments. The decay \mu \to e
\gamma is expected to occur with a branching ratio of the same order as the
present experimental limit. The first order QED radiative correction is
considered.
| [
{
"created": "Wed, 8 Aug 2001 15:56:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Calmet",
"Xavier",
""
]
] | The leptons are viewed as composite objects, exhibiting anomalous magnetic moments and anomalous flavor-changing transition moments. The decay \mu \to e \gamma is expected to occur with a branching ratio of the same order as the present experimental limit. The first order QED radiative correction is considered. |
1009.1936 | Leonard Gamberg | Leonard Gamberg and Zhong-Bo Kang | Process dependent Sivers function and implications for single spin
asymmetry in inclusive hadron production | 12 pages, 5 figures, extended discussion on connection with twist
three approach, references added | Phys.Lett.B696:109-118,2011 | 10.1016/j.physletb.2010.11.066 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the single transverse spin asymmetries in the single inclusive
particle production within the framework of the generalized parton model (GPM).
By carefully analyzing the initial- and final-state interactions, we include
the process-dependence of the Sivers functions into the GPM formalism. The
modified GPM formalism has a close connection with the collinear twist-3
approach. Within the new formalism, we make predictions for inclusive $\pi^0$
and direct photon productions at RHIC energies. We find the predictions are
opposite to those in the conventional GPM approach.
| [
{
"created": "Fri, 10 Sep 2010 05:51:43 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Nov 2010 17:22:11 GMT",
"version": "v2"
}
] | 2011-04-28 | [
[
"Gamberg",
"Leonard",
""
],
[
"Kang",
"Zhong-Bo",
""
]
] | We study the single transverse spin asymmetries in the single inclusive particle production within the framework of the generalized parton model (GPM). By carefully analyzing the initial- and final-state interactions, we include the process-dependence of the Sivers functions into the GPM formalism. The modified GPM formalism has a close connection with the collinear twist-3 approach. Within the new formalism, we make predictions for inclusive $\pi^0$ and direct photon productions at RHIC energies. We find the predictions are opposite to those in the conventional GPM approach. |
1608.03577 | Andrew Buckley | Andy Buckley, Debottam Bakshi Gupta | Powheg-Pythia matching scheme effects in NLO simulation of dijet events | 18 pages, 6 figures | null | null | MCnet-16-34 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most important developments in Monte Carlo simulation of collider
events for the LHC has been the arrival of schemes and codes for matching of
parton showers to matrix elements calculated at next-to-leading order in the
QCD coupling. The POWHEG scheme, and particularly its implementation in the
POWHEG-BOX code, has attracted most attention due to ease of use and effective
portability between parton shower algorithms.
But formal accuracy to NLO does not guarantee predictivity, and the
beyond-fixed-order corrections associated with the shower may be large.
Further, there are open questions over which is the "best" variant of the
POWHEG matching procedure to use, and how to evaluate systematic uncertainties
due to the degrees of freedom in the scheme.
In this paper we empirically explore the scheme variations allowed in Pythia8
matching to POWHEG-BOX dijet events, demonstrating the effects of both discrete
and continuous freedoms in emission vetoing details for both tuning to data and
for estimation of systematic uncertainties from the matching and parton shower
aspects of the POWHEG-BOX+Pythia8 generator combination.
| [
{
"created": "Thu, 11 Aug 2016 19:37:05 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2016 12:39:39 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Jan 2017 16:12:16 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Dec 2017 20:11:41 GMT",
"version": "v4"
}
] | 2017-12-21 | [
[
"Buckley",
"Andy",
""
],
[
"Gupta",
"Debottam Bakshi",
""
]
] | One of the most important developments in Monte Carlo simulation of collider events for the LHC has been the arrival of schemes and codes for matching of parton showers to matrix elements calculated at next-to-leading order in the QCD coupling. The POWHEG scheme, and particularly its implementation in the POWHEG-BOX code, has attracted most attention due to ease of use and effective portability between parton shower algorithms. But formal accuracy to NLO does not guarantee predictivity, and the beyond-fixed-order corrections associated with the shower may be large. Further, there are open questions over which is the "best" variant of the POWHEG matching procedure to use, and how to evaluate systematic uncertainties due to the degrees of freedom in the scheme. In this paper we empirically explore the scheme variations allowed in Pythia8 matching to POWHEG-BOX dijet events, demonstrating the effects of both discrete and continuous freedoms in emission vetoing details for both tuning to data and for estimation of systematic uncertainties from the matching and parton shower aspects of the POWHEG-BOX+Pythia8 generator combination. |
hep-ph/0212105 | Arlene Cristina Aguilar | A.C.Aguilar, A.A.Natale and P.S.Rodrigues da Silva (IFT-Unesp, Sao
Paulo) | Relating a gluon mass scale to an infrared fixed point in pure gauge QCD | 4 pages, Revtex - Added some clarifying comments and new references | Phys.Rev.Lett. 90 (2003) 152001 | 10.1103/PhysRevLett.90.152001 | null | hep-ph hep-th | null | We show that in pure gauge QCD (or any pure non-Abelian gauge theory) the
condition for the existence of a global minimum of energy with a gluon (gauge
boson) mass scale also implies the existence of a fixed point of the $\beta$
function. We argue that the frozen value of the coupling constant found in some
solutions of the Schwinger-Dyson equations of QCD can be related to this fixed
point. We also discuss how the inclusion of fermions modifies this property.
| [
{
"created": "Fri, 6 Dec 2002 17:41:23 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2003 12:55:24 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Aguilar",
"A. C.",
"",
"IFT-Unesp, Sao\n Paulo"
],
[
"Natale",
"A. A.",
"",
"IFT-Unesp, Sao\n Paulo"
],
[
"da Silva",
"P. S. Rodrigues",
"",
"IFT-Unesp, Sao\n Paulo"
]
] | We show that in pure gauge QCD (or any pure non-Abelian gauge theory) the condition for the existence of a global minimum of energy with a gluon (gauge boson) mass scale also implies the existence of a fixed point of the $\beta$ function. We argue that the frozen value of the coupling constant found in some solutions of the Schwinger-Dyson equations of QCD can be related to this fixed point. We also discuss how the inclusion of fermions modifies this property. |
0911.5348 | Edmond Berger | Edmond L. Berger, C. B. Jackson (Argonne), Gabe Shaughnessy (Argonne
and Northwestern) | Characteristics and Estimates of Double Parton Scattering at the Large
Hadron Collider | 23 pages, 11 figures | Phys.Rev.D81:014014,2010 | 10.1103/PhysRevD.81.014014 | ANL-HEP-PR-09-109, NU-HEP-TH/09-14 | hep-ph hep-ex | http://creativecommons.org/licenses/publicdomain/ | We evaluate the kinematic distributions in phase space of 4-parton
final-state subprocesses produced by double parton scattering, and we contrast
these with the final-state distributions that originate from conventional
single parton scattering. Our goal is to establish the distinct topologies of
events that arise from these two sources and to provide a methodology for
experimental determination of the relative magnitude of the double parton and
single parton contributions at Large Hadron Collider energies. We examine two
cases in detail, the $b \bar{b} \rm{jet jet}$ and the 4 jet final states. After
full parton-level simulations, we identify a few variables that separate the
two contributions remarkably well, and we suggest their use experimentally for
an empirical measurement of the relative cross section. We show that the double
parton contribution falls off significantly more rapidly with the transverse
momentum of the leading jet, but, up to issues of the relative normalization,
may be dominant at modest values of this transverse momentum.
| [
{
"created": "Fri, 27 Nov 2009 21:07:12 GMT",
"version": "v1"
}
] | 2010-05-28 | [
[
"Berger",
"Edmond L.",
"",
"Argonne"
],
[
"Jackson",
"C. B.",
"",
"Argonne"
],
[
"Shaughnessy",
"Gabe",
"",
"Argonne\n and Northwestern"
]
] | We evaluate the kinematic distributions in phase space of 4-parton final-state subprocesses produced by double parton scattering, and we contrast these with the final-state distributions that originate from conventional single parton scattering. Our goal is to establish the distinct topologies of events that arise from these two sources and to provide a methodology for experimental determination of the relative magnitude of the double parton and single parton contributions at Large Hadron Collider energies. We examine two cases in detail, the $b \bar{b} \rm{jet jet}$ and the 4 jet final states. After full parton-level simulations, we identify a few variables that separate the two contributions remarkably well, and we suggest their use experimentally for an empirical measurement of the relative cross section. We show that the double parton contribution falls off significantly more rapidly with the transverse momentum of the leading jet, but, up to issues of the relative normalization, may be dominant at modest values of this transverse momentum. |
1509.08727 | York Schroder | Ioan Ghisoiu, Jan Moller, York Schroder | Debye screening mass of hot Yang-Mills theory to three-loop order | 19 pages, 2 figures | null | 10.1007/JHEP11(2015)121 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building upon our earlier work, we compute a Debye mass of finite-temperature
Yang-Mills theory to three-loop order. As an application, we determine a $g^7$
contribution to the thermodynamic pressure of hot QCD.
| [
{
"created": "Tue, 29 Sep 2015 12:58:05 GMT",
"version": "v1"
}
] | 2016-01-20 | [
[
"Ghisoiu",
"Ioan",
""
],
[
"Moller",
"Jan",
""
],
[
"Schroder",
"York",
""
]
] | Building upon our earlier work, we compute a Debye mass of finite-temperature Yang-Mills theory to three-loop order. As an application, we determine a $g^7$ contribution to the thermodynamic pressure of hot QCD. |
1003.2765 | Sedigheh Deldar | Sedigheh Deldar, Shahnoosh Rafibakhsh (University of Tehran) | Removing the concavity of the thick center vortex potentials by
fluctuating the vortex profile | 7 pages, 4 figures | Phys.Rev.D81:054501,2010 | 10.1103/PhysRevD.81.054501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thick center vortex model reproduces important aspects of the potentials
between static quark sources as seen in lattice Yang-Mills calculations: Both
the intermediate distance behavior, governed by Casimir scaling, as well as the
long distance behavior, governed by N-ality, are obtained. However, when a
fixed vortex profile is used, these two distance regimes do not connect
naturally to each other. The transition in general violates concavity
constraints on the potential, especially for higher representations of the
gauge group. We demonstrate how this issue can be alleviated when the vortex
profile is allowed to fluctuate within this simple model.
| [
{
"created": "Sun, 14 Mar 2010 06:38:17 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Deldar",
"Sedigheh",
"",
"University of Tehran"
],
[
"Rafibakhsh",
"Shahnoosh",
"",
"University of Tehran"
]
] | The thick center vortex model reproduces important aspects of the potentials between static quark sources as seen in lattice Yang-Mills calculations: Both the intermediate distance behavior, governed by Casimir scaling, as well as the long distance behavior, governed by N-ality, are obtained. However, when a fixed vortex profile is used, these two distance regimes do not connect naturally to each other. The transition in general violates concavity constraints on the potential, especially for higher representations of the gauge group. We demonstrate how this issue can be alleviated when the vortex profile is allowed to fluctuate within this simple model. |
2002.02399 | Christopher Potter | C.T. Potter | Primer on ILC Physics and SiD Software Tools | Minor corrections. Submitted to EPJ+ | null | null | null | hep-ph hep-ex physics.comp-ph physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We first outline the Standard Model (SM) of particle physics, particle
production and decay, and the expected signal and background at a Higgs factory
like the International Linear Collider (ILC). We then introduce high energy
colliders and collider detectors, and briefly detail the ILC and the Silicon
Detector (SiD), one of the two detectors proposed for the ILC. Next we review
the available software tools for ILC event generation, SiD detector simulation,
and event reconstruction. Finally we suggest open avenues in research for
detector optimization and physics analysis. The pedagogical level is suitable
for advanced undergraduate and beginning graduate students in physics and
research scientists in related fields.
| [
{
"created": "Tue, 4 Feb 2020 23:18:51 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Apr 2020 17:30:05 GMT",
"version": "v2"
},
{
"created": "Fri, 8 May 2020 21:43:07 GMT",
"version": "v3"
}
] | 2020-05-12 | [
[
"Potter",
"C. T.",
""
]
] | We first outline the Standard Model (SM) of particle physics, particle production and decay, and the expected signal and background at a Higgs factory like the International Linear Collider (ILC). We then introduce high energy colliders and collider detectors, and briefly detail the ILC and the Silicon Detector (SiD), one of the two detectors proposed for the ILC. Next we review the available software tools for ILC event generation, SiD detector simulation, and event reconstruction. Finally we suggest open avenues in research for detector optimization and physics analysis. The pedagogical level is suitable for advanced undergraduate and beginning graduate students in physics and research scientists in related fields. |
hep-ph/0403145 | Alexander Khodjamirian | Alexander Khodjamirian | Quantum Chromodynamics and Hadrons: an Elementary Introduction | 52 pages, 25 figures, latex, cernrep.cls; lectures at the 2003
European School of High-Energy Physics, Tsakhkadzor, Armenia, September 2003 | null | null | SI-HEP-2004-03 | hep-ph | null | Notes of five lectures given at the 2003 European School of High-Energy
Physics, Tsakhkadzor, Armenia, September 2003
| [
{
"created": "Sat, 13 Mar 2004 20:29:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Khodjamirian",
"Alexander",
""
]
] | Notes of five lectures given at the 2003 European School of High-Energy Physics, Tsakhkadzor, Armenia, September 2003 |
2401.03146 | Xinjian Wen | Xin-Jian Wen and Jia Zhang | Thermal effect in hot QCD matter in strong magnetic fields | 8 pages, 6 figures, accepted for publication in PRC | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The quasiparticle model is improved by the free magnetic contribution to
investigated the QCD matter in a strong magnetic field. The
temperature-dependent bag function is determined by the thermodynamic
consistency to represent the difference in energy density between physical
vacuum and lowest state of QCD. It is found that the positive bag function
vanishes at high temperature indicating the deconfinement. The rapid decrease
of the bag function in stronger magnetic fields reveals the so-called inverse
magnetic catalysis. The interaction measure at high temperature remains so
large that the usual Stefan-Boltzmann limit can not be reached. We suggest a
limit $|q_iB_m|T^2/4$ for each landau level pressure. Finally, it is
demonstrated that the positive magnetization modified by the bag function and
free magnetic contribution indicates the paramagnetic characteristic of QCD
matter.
| [
{
"created": "Sat, 6 Jan 2024 07:39:27 GMT",
"version": "v1"
}
] | 2024-01-09 | [
[
"Wen",
"Xin-Jian",
""
],
[
"Zhang",
"Jia",
""
]
] | The quasiparticle model is improved by the free magnetic contribution to investigated the QCD matter in a strong magnetic field. The temperature-dependent bag function is determined by the thermodynamic consistency to represent the difference in energy density between physical vacuum and lowest state of QCD. It is found that the positive bag function vanishes at high temperature indicating the deconfinement. The rapid decrease of the bag function in stronger magnetic fields reveals the so-called inverse magnetic catalysis. The interaction measure at high temperature remains so large that the usual Stefan-Boltzmann limit can not be reached. We suggest a limit $|q_iB_m|T^2/4$ for each landau level pressure. Finally, it is demonstrated that the positive magnetization modified by the bag function and free magnetic contribution indicates the paramagnetic characteristic of QCD matter. |
hep-ph/0111036 | Miroslav Pardy | Miroslav Pardy | The circle electromagnetic pulsar | 11 pages | null | null | MUNI-2001/123 | hep-ph | null | The power spectrum formula of the synchrotron radiation generated by the
electron and positron moving along the concentric circles at the opposite
angular velocities in homogenous magnetic field is derived in the Schwinger
version of quantum electrodynamics. The asymptotical form of this formula is
found. The spectrum depends periodically on time which means that the system
composed from electron, positron and magnetic field forms the pulsating system.
The similar calculations are performed in the case that the circles of motion
are excentric.
| [
{
"created": "Mon, 5 Nov 2001 11:12:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pardy",
"Miroslav",
""
]
] | The power spectrum formula of the synchrotron radiation generated by the electron and positron moving along the concentric circles at the opposite angular velocities in homogenous magnetic field is derived in the Schwinger version of quantum electrodynamics. The asymptotical form of this formula is found. The spectrum depends periodically on time which means that the system composed from electron, positron and magnetic field forms the pulsating system. The similar calculations are performed in the case that the circles of motion are excentric. |
1701.07171 | Alexey Zhevlakov | A.S. Zhevlakov (Tomsk State University) | Transition form-factor of $\gamma\rightarrow 3\pi$ in nonlocal quark
model | 7 pages (3 Figures) | Phys. Rev. D 95, 074025 (2017) | 10.1103/PhysRevD.95.074025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transition form factor of a gamma into three pions $F_{3\pi}$ are studied
in a framework of nonlocal chiral quark model. In local limit the result is
agreement with chiral perturbative theory and reproduce Wess-Zumino-Witten
anomaly. Availability of nonlocality not change a value of transition form
factor in chiral limit. On the physical threshold of reaction, the transition
form factor $F_{3\pi}$ is obtained close to the experimental data on account of
current mass of quark.
| [
{
"created": "Wed, 25 Jan 2017 05:52:38 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2017 05:31:45 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Apr 2017 05:58:43 GMT",
"version": "v3"
}
] | 2017-04-26 | [
[
"Zhevlakov",
"A. S.",
"",
"Tomsk State University"
]
] | The transition form factor of a gamma into three pions $F_{3\pi}$ are studied in a framework of nonlocal chiral quark model. In local limit the result is agreement with chiral perturbative theory and reproduce Wess-Zumino-Witten anomaly. Availability of nonlocality not change a value of transition form factor in chiral limit. On the physical threshold of reaction, the transition form factor $F_{3\pi}$ is obtained close to the experimental data on account of current mass of quark. |
2003.02272 | Ameen Ismail | Ameen Ismail, Heather E. Logan, Yongcheng Wu | Updated constraints on the Georgi-Machacek model from LHC Run 2 | 16 pages, 15 figures; references added, submitted to PRD | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the experimental constraints on the Georgi-Machacek model from
direct searches for the new Higgs bosons and measurements of the properties of
the discovered 125 GeV Higgs boson. We apply these by interfacing the public
codes HiggsBounds 5.2.0 and HiggsSignals 2.2.1, which implement a large
collection of direct-search constraints on extra Higgs bosons and measurements
of the properties of the 125 GeV state to the model calculator GMCALC. We also
implement constraints involving searches for doubly-charged Higgs bosons and
Drell-Yan production of a neutral Higgs with decays to photon pairs directly
into GMCALC; these channels are not included in HiggsBounds but provide
important constraints on the model, especially at low mass. We identify new
constraints on the model from $H_3^0 \to Z h$ and $H \to hh$ and point out that
these channels remain promising. We also determine the allowed range of
couplings of the SM-like Higgs boson after all experimental constraints are
applied and show that the direct searches for additional Higgs bosons are
generally more constraining than the measurements of the 125 GeV Higgs boson
couplings. The updated GMCALC code will be released as version 1.5.0.
| [
{
"created": "Wed, 4 Mar 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 00:48:37 GMT",
"version": "v2"
}
] | 2020-04-17 | [
[
"Ismail",
"Ameen",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Wu",
"Yongcheng",
""
]
] | We study the experimental constraints on the Georgi-Machacek model from direct searches for the new Higgs bosons and measurements of the properties of the discovered 125 GeV Higgs boson. We apply these by interfacing the public codes HiggsBounds 5.2.0 and HiggsSignals 2.2.1, which implement a large collection of direct-search constraints on extra Higgs bosons and measurements of the properties of the 125 GeV state to the model calculator GMCALC. We also implement constraints involving searches for doubly-charged Higgs bosons and Drell-Yan production of a neutral Higgs with decays to photon pairs directly into GMCALC; these channels are not included in HiggsBounds but provide important constraints on the model, especially at low mass. We identify new constraints on the model from $H_3^0 \to Z h$ and $H \to hh$ and point out that these channels remain promising. We also determine the allowed range of couplings of the SM-like Higgs boson after all experimental constraints are applied and show that the direct searches for additional Higgs bosons are generally more constraining than the measurements of the 125 GeV Higgs boson couplings. The updated GMCALC code will be released as version 1.5.0. |
hep-ph/9603210 | Laura Reina | David Atwood (CEBAF), Laura Reina (BNL) and Amarjit Soni (BNL) | $R_b$ and $R_c$ in the Two Higgs Doublet Model with Flavor Changing
Neutral Currents | 35 pages, 5 Postscript figures, 10 Postscript files used in the tex
file, uses epsf.sty | Phys.Rev.D54:3296-3308,1996 | 10.1103/PhysRevD.54.3296 | CEBAF-TH-96-01 | hep-ph | null | A study of $R_b$ and $R_c$ is presented in the context of a Two Higgs Doublet
Model (2HDM) with flavor changing scalar currents (FCSC). Implications of the
model for the $\rho$-parameter and for $b\to s\gamma$ are also considered. The
experimental data on $R_b$ places stringent constraints on the model
parameters. The configuration of the model needed to account for $R_b$ is found
to be irreconcilable with constraints from $b\to s\gamma$ and $\rho$. In
particular, if $R^{\rm exp}_b>R^{\sss{\rm SM}}_b$ persists then this version of
2HDM will be ruled out or require significant modifications. Noting that
aspects of the experimental analysis for $R_b$ and $R_c$ may be of some
concern, we also disregard $R^{\rm exp}_b$ and $R^{\rm exp}_c$ and give
predictions for these using constraints from $b\to s\gamma$ and $\rho$
parameter only. We emphasize the theoretical and experimental advantages of the
observable $R_{b+c}\equiv \Gamma(Z\to b\bar b\mbox{ or } c\bar
c)/\Gamma(Z\to\mbox{hadrons})$. We also stress the role of $R_\ell\equiv
\Gamma(Z\to\mbox{hadrons})/\Gamma(Z\to \ell^+\ell^-)$ in testing the Standard
Model (SM) despite its dependence on QCD corrections. Noting that in models
with FCNC the amplitude for $Z\to c\bar c$ receives a contribution which grows
with $m^2_t$, the importance and uniqueness of precision $Z\to c\bar c$
measurements for constraining flavor changing $t\bar c$ currents is
underscored.
| [
{
"created": "Fri, 1 Mar 1996 23:26:14 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Atwood",
"David",
"",
"CEBAF"
],
[
"Reina",
"Laura",
"",
"BNL"
],
[
"Soni",
"Amarjit",
"",
"BNL"
]
] | A study of $R_b$ and $R_c$ is presented in the context of a Two Higgs Doublet Model (2HDM) with flavor changing scalar currents (FCSC). Implications of the model for the $\rho$-parameter and for $b\to s\gamma$ are also considered. The experimental data on $R_b$ places stringent constraints on the model parameters. The configuration of the model needed to account for $R_b$ is found to be irreconcilable with constraints from $b\to s\gamma$ and $\rho$. In particular, if $R^{\rm exp}_b>R^{\sss{\rm SM}}_b$ persists then this version of 2HDM will be ruled out or require significant modifications. Noting that aspects of the experimental analysis for $R_b$ and $R_c$ may be of some concern, we also disregard $R^{\rm exp}_b$ and $R^{\rm exp}_c$ and give predictions for these using constraints from $b\to s\gamma$ and $\rho$ parameter only. We emphasize the theoretical and experimental advantages of the observable $R_{b+c}\equiv \Gamma(Z\to b\bar b\mbox{ or } c\bar c)/\Gamma(Z\to\mbox{hadrons})$. We also stress the role of $R_\ell\equiv \Gamma(Z\to\mbox{hadrons})/\Gamma(Z\to \ell^+\ell^-)$ in testing the Standard Model (SM) despite its dependence on QCD corrections. Noting that in models with FCNC the amplitude for $Z\to c\bar c$ receives a contribution which grows with $m^2_t$, the importance and uniqueness of precision $Z\to c\bar c$ measurements for constraining flavor changing $t\bar c$ currents is underscored. |
2210.10560 | Mengchu Cai | Mengchu Cai, Tianbo Liu, Bo-Qiang Ma | Dilepton production in the photodisintegration of the deuteron | 30 pages, 16 figures | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study the lepton pair production in the photodisintegration of the
deuteron process. The complete seven-fold differential cross section is
calculated via the Bethe-Heitler mechanism with final state interactions taken
into account. The deuteron bound state is described by a relativistic covariant
deuteron-nucleon vertex. With numerical results, we find that the differential
cross section has strong dependence on the lepton azimuthal angle in the small
polar angle region and sharp peaks appear in the dependence on the invariant
mass of the produced lepton pair or the two nucleons in the final state. We
demonstrate that such nearly singular feature originates from the collinearity
between the produced lepton or antilepton and the incident photon, and it is
physically regularized by the lepton mass in our calculation. The final state
interaction between the knocked-out nucleon and the recoil nucleon
redistributes the differential cross section over the missing momentum, with a
significant enhancement at large missing momentum and a suppression in the
intermediate region. With a further decomposition of the final state
interaction contribution, it is found that the on-shell term dominates the near
quasi-elastic region while the off-shell term dominates the other end. In
addition, we examine the contribution from the interference between the proton
amplitude and the neutron amplitude, which as expected is found negligible even
if the proton-neutron rescattering is included. The result in this work can
serve as an input for the analysis and background estimation of multiple
exclusive measurements at Jefferson Lab and future electron-ion colliders.
| [
{
"created": "Wed, 19 Oct 2022 14:00:05 GMT",
"version": "v1"
}
] | 2022-10-20 | [
[
"Cai",
"Mengchu",
""
],
[
"Liu",
"Tianbo",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We study the lepton pair production in the photodisintegration of the deuteron process. The complete seven-fold differential cross section is calculated via the Bethe-Heitler mechanism with final state interactions taken into account. The deuteron bound state is described by a relativistic covariant deuteron-nucleon vertex. With numerical results, we find that the differential cross section has strong dependence on the lepton azimuthal angle in the small polar angle region and sharp peaks appear in the dependence on the invariant mass of the produced lepton pair or the two nucleons in the final state. We demonstrate that such nearly singular feature originates from the collinearity between the produced lepton or antilepton and the incident photon, and it is physically regularized by the lepton mass in our calculation. The final state interaction between the knocked-out nucleon and the recoil nucleon redistributes the differential cross section over the missing momentum, with a significant enhancement at large missing momentum and a suppression in the intermediate region. With a further decomposition of the final state interaction contribution, it is found that the on-shell term dominates the near quasi-elastic region while the off-shell term dominates the other end. In addition, we examine the contribution from the interference between the proton amplitude and the neutron amplitude, which as expected is found negligible even if the proton-neutron rescattering is included. The result in this work can serve as an input for the analysis and background estimation of multiple exclusive measurements at Jefferson Lab and future electron-ion colliders. |
1511.01011 | Nima Pourtolami | Mariana Frank, Nima Pourtolami, and Manuel Toharia | Higgs boson production and decay in 5D warped models | 29 pages, 10 figures | Phys. Rev. D 93, 056004 (2016) | 10.1103/PhysRevD.93.056004 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the production and decay rates of the Higgs boson at the LHC in
the context of general 5 dimensional (5D) warped scenarios with a spacetime
background modified from the usual $AdS_5$, with SM fields propagating in the
bulk. We extend previous work by considering the full flavor structure of the
SM, and thus including all possible flavor effects coming from mixings with
heavy fermions. We proceed in three different ways, first by only including two
complete Kaluza-Klein (KK) levels ($15\times15$ fermion mass matrices), then
including three complete KK levels ($21\times21$ fermion mass matrices) and
finally we compare with the effect of including the infinite (full) KK towers.
We present numerical results for the Higgs production cross section via gluon
fusion and Higgs decay branching fractions in both the modified metric scenario
and in the usual Randall-Sundrum metric scenario.
| [
{
"created": "Tue, 3 Nov 2015 17:48:08 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2016 19:27:03 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Frank",
"Mariana",
""
],
[
"Pourtolami",
"Nima",
""
],
[
"Toharia",
"Manuel",
""
]
] | We calculate the production and decay rates of the Higgs boson at the LHC in the context of general 5 dimensional (5D) warped scenarios with a spacetime background modified from the usual $AdS_5$, with SM fields propagating in the bulk. We extend previous work by considering the full flavor structure of the SM, and thus including all possible flavor effects coming from mixings with heavy fermions. We proceed in three different ways, first by only including two complete Kaluza-Klein (KK) levels ($15\times15$ fermion mass matrices), then including three complete KK levels ($21\times21$ fermion mass matrices) and finally we compare with the effect of including the infinite (full) KK towers. We present numerical results for the Higgs production cross section via gluon fusion and Higgs decay branching fractions in both the modified metric scenario and in the usual Randall-Sundrum metric scenario. |
hep-ph/9908468 | null | Aiichi Iwazaki | Emission of Radio Waves in Gamma Ray Bursts and Axionic Boson Stars | 9 pages, Revtex | null | null | Nisho-99/4 | hep-ph astro-ph | null | We point out that the bursts of photons with the energy of the axion mass may
appear coincidentally with gamma ray bursts if the gamma ray bursts are caused
by collisions between neutron stars and axionic boson stars. In this mechanism,
jets are formed in the collisions with large Lorentz factors $\geq 10^2$. We
explain qualitatively time-dependent complex structures of gamma ray bursts as
well as the large energy problem. Therefore, with detection of the
monochromatic photons we can test the model and determine the axion mass.
| [
{
"created": "Thu, 26 Aug 1999 00:51:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iwazaki",
"Aiichi",
""
]
] | We point out that the bursts of photons with the energy of the axion mass may appear coincidentally with gamma ray bursts if the gamma ray bursts are caused by collisions between neutron stars and axionic boson stars. In this mechanism, jets are formed in the collisions with large Lorentz factors $\geq 10^2$. We explain qualitatively time-dependent complex structures of gamma ray bursts as well as the large energy problem. Therefore, with detection of the monochromatic photons we can test the model and determine the axion mass. |
hep-ph/0402227 | XiaoHu Mo | P.Wang, X.H.Mo and C.Z.Yuan | Measuring psi(3770) -> Kshort Klong as a test of the S- and D-wave
mixing of charmonia | 4 pages, 1 figure | Phys.Rev.D70:077505,2004 | 10.1103/PhysRevD.70.077505 | null | hep-ph | null | Adding to the long standing "rho-pi puzzle" in psi(3686) and J/psi decays,
recently BES reported the branching ratio of psi(3686) -> Kshort Klong which is
enhanced relative to the pQCD " 12% rule" expectation from the branching ratio
of J/psi -> Kshort Klong. If the enhancement is due to the mixing of the S- and
D-wave charmonium states as in the rho-pi case, the newly measured branching
ratio of psi(3686) -> Kshort Klong gives a constraint on the psi(3770) ->
Kshort Klong. It serves as a good test for the scenario of the S- and D-wave
mixing in the psi(3686) and psi(3770).
| [
{
"created": "Sun, 22 Feb 2004 03:33:26 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 2004 00:59:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wang",
"P.",
""
],
[
"Mo",
"X. H.",
""
],
[
"Yuan",
"C. Z.",
""
]
] | Adding to the long standing "rho-pi puzzle" in psi(3686) and J/psi decays, recently BES reported the branching ratio of psi(3686) -> Kshort Klong which is enhanced relative to the pQCD " 12% rule" expectation from the branching ratio of J/psi -> Kshort Klong. If the enhancement is due to the mixing of the S- and D-wave charmonium states as in the rho-pi case, the newly measured branching ratio of psi(3686) -> Kshort Klong gives a constraint on the psi(3770) -> Kshort Klong. It serves as a good test for the scenario of the S- and D-wave mixing in the psi(3686) and psi(3770). |
2205.05997 | Ignazio Scimemi | Ignazio Scimemi | The vector boson transverse momentum distributions | Proceedings of Rencontres de Moriond 2022, QCD, 19-26 march 2022 | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transverse momentum dependent distributions (TMD) are an essential part
of the factorization theorems in vector boson production. They are
non-perturbative, double scale dependent functions that asymptotically match
onto collinear parton distributions functions (PDF). Once TMD are expressed
using PDF, one observes that they are sensitive to the choice and quality of
PDF sets (PDF bias). A solution to this problem is found and discussed.
Nevertheless the main source of error on vector boson spectra still comes from
PDF uncertainty propagation.
| [
{
"created": "Thu, 12 May 2022 10:18:28 GMT",
"version": "v1"
}
] | 2022-05-13 | [
[
"Scimemi",
"Ignazio",
""
]
] | The transverse momentum dependent distributions (TMD) are an essential part of the factorization theorems in vector boson production. They are non-perturbative, double scale dependent functions that asymptotically match onto collinear parton distributions functions (PDF). Once TMD are expressed using PDF, one observes that they are sensitive to the choice and quality of PDF sets (PDF bias). A solution to this problem is found and discussed. Nevertheless the main source of error on vector boson spectra still comes from PDF uncertainty propagation. |
hep-ph/9611298 | null | N.V.Krasnikov and V.V.Popov | PLANCKSUSY - new program for SUSY masses calculations: from Planck scale
to our reality | 11 pages, latex, no figures | null | null | Preprint INR 976TH/96 | hep-ph | null | We describe briefly new program for SUSY masses calculations. The main
distinction of our program is that we start to solve the renormalization group
equations for soft SUSY breaking parameters for SU(5) SUSY GUT model from
Planck scale $M_{PL} = 2.4\cdot 10^{18}$ Gev. Our program works also for large
$tan(\beta)$. We find that for $m_0 \leq 0.5 \cdot m_{1/2}$ the effects of the
evolution from Planck scale to GUT scale are very essential. In particular, we
find that neutralino even for small $m_0$ is always LSP. We also introduced in
our program some parameter of non-universality of the gaugino masses at GUT
scale. Playing with the non-universality of the gaugino masses at GUT scale it
is possible to have the situation when leptonic modes are suppressed and the
single SUSY signature is hadronic jets with missing energy.
| [
{
"created": "Mon, 11 Nov 1996 10:45:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krasnikov",
"N. V.",
""
],
[
"Popov",
"V. V.",
""
]
] | We describe briefly new program for SUSY masses calculations. The main distinction of our program is that we start to solve the renormalization group equations for soft SUSY breaking parameters for SU(5) SUSY GUT model from Planck scale $M_{PL} = 2.4\cdot 10^{18}$ Gev. Our program works also for large $tan(\beta)$. We find that for $m_0 \leq 0.5 \cdot m_{1/2}$ the effects of the evolution from Planck scale to GUT scale are very essential. In particular, we find that neutralino even for small $m_0$ is always LSP. We also introduced in our program some parameter of non-universality of the gaugino masses at GUT scale. Playing with the non-universality of the gaugino masses at GUT scale it is possible to have the situation when leptonic modes are suppressed and the single SUSY signature is hadronic jets with missing energy. |
hep-ph/9409417 | Yong Yeon Keum | Y. Y. Keum | On the determination of the relative sign of $a_1$ and $a_2$ from
polarization measurements in $B^- \rightarrow \rho^- {D^*}^o$ decay | 15 pages in Latex, 10 figures(available by request), Report # :
PAR/LPTHE/94-40, hep-ph/9409417 | Phys.Lett. B348 (1995) 247-255 | 10.1016/0370-2693(95)00117-4 | null | hep-ph | null | We point out that polarization measurements such as the longitudinal fraction
and the transverse left-right asymmetry in the Bauer-Stech-Wirbel (BSW) class
III processes involving two final vector mesons, $B^- \ra \rho^- {D^*}^o$ taken
as an example, are useful in determining the relative sign as well as the
relative magnitudes of the coefficients $a_1$ and $a_2$.
| [
{
"created": "Mon, 26 Sep 1994 17:01:11 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 1994 18:35:27 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Keum",
"Y. Y.",
""
]
] | We point out that polarization measurements such as the longitudinal fraction and the transverse left-right asymmetry in the Bauer-Stech-Wirbel (BSW) class III processes involving two final vector mesons, $B^- \ra \rho^- {D^*}^o$ taken as an example, are useful in determining the relative sign as well as the relative magnitudes of the coefficients $a_1$ and $a_2$. |
hep-ph/0207324 | Robert Fleischer | Robert Fleischer (DESY Hamburg) | Extracting gamma Through Flavour-Symmetry Strategies | 6 pages, LaTeX. Contribution to the proceedings of the workshop on
the CKM unitarity triangle, CERN, Geneva, 13-16 February 2002 | null | null | DESY 02-102 | hep-ph | null | A brief overview of flavour-symmetry strategies to extract the angle gamma of
the unitarity triangle is given, focusing on B --> pi K modes and the B_d -->
pi^+ pi^-, B_s --> K^+ K^- system. We discuss also a variant of the latter
approach for the e^+ e^- B-factories, where B_s --> K^+ K^- is replaced by B_d
--> pi^{+/-} K^{+/-}.
| [
{
"created": "Fri, 26 Jul 2002 14:29:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fleischer",
"Robert",
"",
"DESY Hamburg"
]
] | A brief overview of flavour-symmetry strategies to extract the angle gamma of the unitarity triangle is given, focusing on B --> pi K modes and the B_d --> pi^+ pi^-, B_s --> K^+ K^- system. We discuss also a variant of the latter approach for the e^+ e^- B-factories, where B_s --> K^+ K^- is replaced by B_d --> pi^{+/-} K^{+/-}. |
1106.4962 | Vladimir Skalozub | E.Elizalde and V.Skalozub | Lower bound on the magnetic field strength in the hot universe | 6 pages | null | null | null | hep-ph astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is assumed that long range coherent magnetic fields in the universe were
spontaneously generated at high temperature due to vacuum polarization of
non-Abelian gauge fields, and resulted in the present intergalaxy magnetic
field. The zero value of the screening mass for fields of this type was
discovered recently. Here, a procedure to estimate the field strengths at
different temperatures is developed and the lower bound on the magnetic field
strength $B \sim 10^{14} G$, at the electroweak phase transition temperature,
is derived. As a particular case, the standard model is considered. Some model
dependent peculiarities of the phenomena under investigation are briefly
discussed.
| [
{
"created": "Fri, 24 Jun 2011 13:05:56 GMT",
"version": "v1"
}
] | 2011-06-27 | [
[
"Elizalde",
"E.",
""
],
[
"Skalozub",
"V.",
""
]
] | It is assumed that long range coherent magnetic fields in the universe were spontaneously generated at high temperature due to vacuum polarization of non-Abelian gauge fields, and resulted in the present intergalaxy magnetic field. The zero value of the screening mass for fields of this type was discovered recently. Here, a procedure to estimate the field strengths at different temperatures is developed and the lower bound on the magnetic field strength $B \sim 10^{14} G$, at the electroweak phase transition temperature, is derived. As a particular case, the standard model is considered. Some model dependent peculiarities of the phenomena under investigation are briefly discussed. |
2310.15136 | Danny Marfatia | Alakabha Datta, Danny Marfatia, Lopamudra Mukherjee | $B \to K \nu\bar\nu$, MiniBooNE and muon $g-2$ anomalies from a dark
sector | 9 pages, 3 figures, 3 tables. Version to appear as a Letter in PRD | Phys. Rev. D 109, L031701 (2024) | 10.1103/PhysRevD.109.L031701 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Belle II has reported the first evidence for $B^+ \to K^+\nu\bar\nu$ with a
branching ratio $2.7 \sigma$ higher than the standard model expectation. We
explain this, and the MiniBooNE and muon anomalous magnetic moment anomalies in
a model with a dark scalar that couples to a slightly heavier sterile Dirac
neutrino and that communicates with the visible sector via a Higgs portal. We
make predictions for rare kaon and other $B$ meson decays.
| [
{
"created": "Mon, 23 Oct 2023 17:42:28 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2024 21:37:54 GMT",
"version": "v2"
}
] | 2024-02-16 | [
[
"Datta",
"Alakabha",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Mukherjee",
"Lopamudra",
""
]
] | Belle II has reported the first evidence for $B^+ \to K^+\nu\bar\nu$ with a branching ratio $2.7 \sigma$ higher than the standard model expectation. We explain this, and the MiniBooNE and muon anomalous magnetic moment anomalies in a model with a dark scalar that couples to a slightly heavier sterile Dirac neutrino and that communicates with the visible sector via a Higgs portal. We make predictions for rare kaon and other $B$ meson decays. |
2109.00040 | Juan Racker | J. Racker | CP violation in mixing and oscillations for leptogenesis II: the highly
degenerate case | 14 pages, 3 figures | null | 10.1007/JHEP11(2021)027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend to the highly degenerate case a recent approach for analyzing the
sources of CP violation in baryogenesis models with quasi-degenerate neutrinos.
In this approach an expansion of the resummed propagator around the poles is
plugged into a quantum field theory model of neutrino oscillations and a source
term for the time evolution of the lepton asymmetry is built directly from the
probabilities of lepton number violating processes involving only stable
particles. This allows for a transparent consideration of unitarity
requirements. The source term has contributions that can be identified with CP
violation from mixing, oscillations and interference between both. For the
highly degenerate case, i.e. when the mass difference between two neutrinos is
similar or smaller than their decay widths, we find that in general the mixing
and oscillation terms contribute with opposite signs to the generation of
lepton asymmetry and the contribution of the interference term is typically
very relevant and crucial to ensure unitarity is satisfied. Moreover, the
expressions we obtain are finite in the double degenerate limit of equal masses
and couplings. The calculations are done in a simple scalar toy model.
| [
{
"created": "Tue, 31 Aug 2021 19:00:40 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Racker",
"J.",
""
]
] | We extend to the highly degenerate case a recent approach for analyzing the sources of CP violation in baryogenesis models with quasi-degenerate neutrinos. In this approach an expansion of the resummed propagator around the poles is plugged into a quantum field theory model of neutrino oscillations and a source term for the time evolution of the lepton asymmetry is built directly from the probabilities of lepton number violating processes involving only stable particles. This allows for a transparent consideration of unitarity requirements. The source term has contributions that can be identified with CP violation from mixing, oscillations and interference between both. For the highly degenerate case, i.e. when the mass difference between two neutrinos is similar or smaller than their decay widths, we find that in general the mixing and oscillation terms contribute with opposite signs to the generation of lepton asymmetry and the contribution of the interference term is typically very relevant and crucial to ensure unitarity is satisfied. Moreover, the expressions we obtain are finite in the double degenerate limit of equal masses and couplings. The calculations are done in a simple scalar toy model. |
1601.07787 | Stefan Dittmaier | B.Biedermann, A.Denner, S.Dittmaier, L.Hofer, B.J\"ager | Electroweak corrections to $pp \to \mu^+\mu^-e^+e^- + X$ at the LHC -- a
Higgs background study | 5 pages, latex, 3 figures | Phys. Rev. Lett. 116, 161803 (2016) | 10.1103/PhysRevLett.116.161803 | FR-PHENO-2016-002, ICCUB-16-003 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first complete calculation of the next-to-leading-order electroweak
corrections to four-lepton production at the LHC is presented, where all
off-shell effects of intermediate Z bosons and photons are taken into account.
Focusing on the mixed final state $\mu^+\mu^-e^+e^-$, we study differential
cross sections that are particularly interesting for Higgs-boson analyses. The
electroweak corrections are divided into photonic and purely weak corrections.
The former exhibit patterns familiar from similar W/Z-boson production
processes with very large radiative tails near resonances and kinematical
shoulders. The weak corrections are of the generic size of 5% and show
interesting variations, in particular a sign change between the regions of
resonant Z-pair production and the Higgs signal.
| [
{
"created": "Thu, 28 Jan 2016 14:56:18 GMT",
"version": "v1"
}
] | 2016-04-27 | [
[
"Biedermann",
"B.",
""
],
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Hofer",
"L.",
""
],
[
"Jäger",
"B.",
""
]
] | The first complete calculation of the next-to-leading-order electroweak corrections to four-lepton production at the LHC is presented, where all off-shell effects of intermediate Z bosons and photons are taken into account. Focusing on the mixed final state $\mu^+\mu^-e^+e^-$, we study differential cross sections that are particularly interesting for Higgs-boson analyses. The electroweak corrections are divided into photonic and purely weak corrections. The former exhibit patterns familiar from similar W/Z-boson production processes with very large radiative tails near resonances and kinematical shoulders. The weak corrections are of the generic size of 5% and show interesting variations, in particular a sign change between the regions of resonant Z-pair production and the Higgs signal. |
hep-ph/9709453 | U. Meissner | Ulf-G. Mei{\ss}ner and S. Steininger | Isospin violation in pion-nucleon scattering | 13 pp, LaTeX, uses epsf, 1 fig | Phys.Lett.B419:403-411,1998 | 10.1016/S0370-2693(97)01418-4 | KFA-IKP(TH)-1997-17 | hep-ph nucl-th | null | We construct the complete effective chiral pion-nucleon Lagrangian in the
presence of virtual photons to one loop. As an application, we consider strong
and electromagnetic isospin violation for scattering of neutral pions off
nucleons. We show that for the scattering lengths these isospin violating terms
are of the same size as the purely hadronic ones. We also analyze
isospin-violating effects for the $\sigma$--term. These can be as large as 10%
for the absolute value but are negligible for the shift to the Cheng-Dashen
point.
| [
{
"created": "Thu, 25 Sep 1997 11:12:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Meißner",
"Ulf-G.",
""
],
[
"Steininger",
"S.",
""
]
] | We construct the complete effective chiral pion-nucleon Lagrangian in the presence of virtual photons to one loop. As an application, we consider strong and electromagnetic isospin violation for scattering of neutral pions off nucleons. We show that for the scattering lengths these isospin violating terms are of the same size as the purely hadronic ones. We also analyze isospin-violating effects for the $\sigma$--term. These can be as large as 10% for the absolute value but are negligible for the shift to the Cheng-Dashen point. |
1302.6229 | Zoe Thomas | Daniele Bertolini, Jesse Thaler, and Zoe Thomas | TASI 2012: Super-Tricks for Superspace | 75 pages, 4 figures, 1 table. v2: formatting improved, hyperlinks
added, references updated | null | 10.1142/9789814525220_0009 | MIT-CTP 4444 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lectures from the TASI 2012 summer school outline the basics of
supersymmetry (SUSY) in 3+1 dimensions. Starting from a ground-up development
of superspace, we develop all of the tools necessary to construct SUSY
lagrangians. While aimed at an introductory level, these lectures incorporate a
number of "super-tricks" for SUSY aficionados, including SUSY-covariant
derivatives, equations of motion in superspace, background field methods, and
non-linear realizations of goldstinos.
| [
{
"created": "Mon, 25 Feb 2013 20:59:33 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2013 19:55:57 GMT",
"version": "v2"
}
] | 2022-09-09 | [
[
"Bertolini",
"Daniele",
""
],
[
"Thaler",
"Jesse",
""
],
[
"Thomas",
"Zoe",
""
]
] | These lectures from the TASI 2012 summer school outline the basics of supersymmetry (SUSY) in 3+1 dimensions. Starting from a ground-up development of superspace, we develop all of the tools necessary to construct SUSY lagrangians. While aimed at an introductory level, these lectures incorporate a number of "super-tricks" for SUSY aficionados, including SUSY-covariant derivatives, equations of motion in superspace, background field methods, and non-linear realizations of goldstinos. |
1704.02149 | Sebastian Wild | Felix Kahlhoefer, Kai Schmidt-Hoberg, Sebastian Wild | Dark matter self-interactions from a general spin-0 mediator | 20 pages, 5 figures + appendices. v2: Matches published version. v3:
fixed typographical mistake in eq. (2.8). v4: fixed typographical mistake in
eq. (C.4) | JCAP08(2017)003 | 10.1088/1475-7516/2017/08/003 | DESY-17-052 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Dark matter particles interacting via the exchange of very light spin-0
mediators can have large self-interaction rates and obtain their relic
abundance from thermal freeze-out. At the same time, these models face strong
bounds from direct and indirect probes of dark matter as well as a number of
constraints on the properties of the mediator. We investigate whether these
constraints can be consistent with having observable effects from dark matter
self-interactions in astrophysical systems. For the case of a mediator with
purely scalar couplings we point out the highly relevant impact of
low-threshold direct detection experiments like CRESST-II, which essentially
rule out the simplest realization of this model. These constraints can be
significantly relaxed if the mediator has CP-violating couplings, but then the
model faces strong constraints from CMB measurements, which can only be avoided
in special regions of parameter space.
| [
{
"created": "Fri, 7 Apr 2017 09:17:47 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2017 15:00:51 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Nov 2017 10:41:21 GMT",
"version": "v3"
},
{
"created": "Fri, 22 Dec 2017 12:53:28 GMT",
"version": "v4"
}
] | 2017-12-25 | [
[
"Kahlhoefer",
"Felix",
""
],
[
"Schmidt-Hoberg",
"Kai",
""
],
[
"Wild",
"Sebastian",
""
]
] | Dark matter particles interacting via the exchange of very light spin-0 mediators can have large self-interaction rates and obtain their relic abundance from thermal freeze-out. At the same time, these models face strong bounds from direct and indirect probes of dark matter as well as a number of constraints on the properties of the mediator. We investigate whether these constraints can be consistent with having observable effects from dark matter self-interactions in astrophysical systems. For the case of a mediator with purely scalar couplings we point out the highly relevant impact of low-threshold direct detection experiments like CRESST-II, which essentially rule out the simplest realization of this model. These constraints can be significantly relaxed if the mediator has CP-violating couplings, but then the model faces strong constraints from CMB measurements, which can only be avoided in special regions of parameter space. |
hep-ph/9603392 | Terry Goldman | G. J. Stephenson Jr., T. Goldman and B. H. J. McKellar | Neutrino Clouds | 23 pages, LaTex, 9 Postscript figures included; submitted to Phys.
Rev. D | Int.J.Mod.Phys.A13:2765-2790,1998 | 10.1142/S0217751X98001414 | LA-UR-96-949 | hep-ph astro-ph | null | We consider the possibility that neutrinos are coupled very weakly to an
extremely light scalar boson. We first analyze the simple problem of one
generation of neutrino and show that, for ranges of parameters that are allowed
by existing data, such a system can have serious consequences for the evolution
of stars and could impact precision laboratory measurements. We discuss the
extension to more generations and show that the general conclusion remains
viable. Finally, we note that, should such a scalar field be present,
experiments give information about effective masses, not the masses that arise
in unified field theories.
| [
{
"created": "Sat, 23 Mar 1996 00:53:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Stephenson",
"G. J.",
"Jr."
],
[
"Goldman",
"T.",
""
],
[
"McKellar",
"B. H. J.",
""
]
] | We consider the possibility that neutrinos are coupled very weakly to an extremely light scalar boson. We first analyze the simple problem of one generation of neutrino and show that, for ranges of parameters that are allowed by existing data, such a system can have serious consequences for the evolution of stars and could impact precision laboratory measurements. We discuss the extension to more generations and show that the general conclusion remains viable. Finally, we note that, should such a scalar field be present, experiments give information about effective masses, not the masses that arise in unified field theories. |
0708.1225 | Yue Chongxing | Chong-Xing Yue, Li-Hong Wang, Jia Wen | Single production of heavy top quark from the three-site Higgsless model | latex files, 13 pages, 5 figures | Chin.Phys.Lett.25:1613-1616,2008 | 10.1088/0256-307X/25/5/025 | null | hep-ph | null | We consider single production of the heavy top quark T predicted by the
three-site Higgsless model in future high energy collider experiments, such as
the high energy linear e^{+}e^{-} collider (ILC), the linear-ring type $ep$
collider (THERA), and the CERN Large Hadron Collider (LHC). Our numerical
results show that the possible signals of the heavy top quark T might be
observed via the process $e^{+}e^{-}\to t\bar{T}\to t\bar{t}Z$ in future ILC
experiments and via the subprocess $qb\to q'T$ at the LHC.
| [
{
"created": "Thu, 9 Aug 2007 08:18:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Yue",
"Chong-Xing",
""
],
[
"Wang",
"Li-Hong",
""
],
[
"Wen",
"Jia",
""
]
] | We consider single production of the heavy top quark T predicted by the three-site Higgsless model in future high energy collider experiments, such as the high energy linear e^{+}e^{-} collider (ILC), the linear-ring type $ep$ collider (THERA), and the CERN Large Hadron Collider (LHC). Our numerical results show that the possible signals of the heavy top quark T might be observed via the process $e^{+}e^{-}\to t\bar{T}\to t\bar{t}Z$ in future ILC experiments and via the subprocess $qb\to q'T$ at the LHC. |
1809.06373 | Douglas Higinbotham | J. M. Alarc\'on, D. W. Higinbotham, C. Weiss and Z. Ye | Proton charge radius extraction from electron scattering data using
dispersively improved chiral effective field theory | 8 pages, 5 figures | Phys. Rev. C 99, 044303 (2019) | 10.1103/PhysRevC.99.044303 | JLAB-THY-18-2804 | hep-ph hep-lat nucl-ex nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extract the proton charge radius from the elastic form factor (FF) data
using a novel theoretical framework combining chiral effective field theory and
dispersion analysis. Complex analyticity in the momentum transfer correlates
the behavior of the spacelike FF at finite $Q^2$ with the derivative at $Q^2 =
0$. The FF calculated in the predictive theory contains the radius as a free
parameter. We determine its value by comparing the predictions with a
descriptive global fit of the spacelike FF data, taking into account the
theoretical and experimental uncertainties. Our method allows us to use the
finite-$Q^2$ FF data for constraining the radius (up to $Q^2\sim$ 0.5 GeV$^2$
and larger) and avoids the difficulties arising in methods relying on the $Q^2
\rightarrow 0$ extrapolation. We obtain a radius of 0.844(7) fm, consistent
with the high-precision muonic hydrogen results.
| [
{
"created": "Mon, 17 Sep 2018 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Apr 2019 15:50:51 GMT",
"version": "v2"
}
] | 2019-04-09 | [
[
"Alarcón",
"J. M.",
""
],
[
"Higinbotham",
"D. W.",
""
],
[
"Weiss",
"C.",
""
],
[
"Ye",
"Z.",
""
]
] | We extract the proton charge radius from the elastic form factor (FF) data using a novel theoretical framework combining chiral effective field theory and dispersion analysis. Complex analyticity in the momentum transfer correlates the behavior of the spacelike FF at finite $Q^2$ with the derivative at $Q^2 = 0$. The FF calculated in the predictive theory contains the radius as a free parameter. We determine its value by comparing the predictions with a descriptive global fit of the spacelike FF data, taking into account the theoretical and experimental uncertainties. Our method allows us to use the finite-$Q^2$ FF data for constraining the radius (up to $Q^2\sim$ 0.5 GeV$^2$ and larger) and avoids the difficulties arising in methods relying on the $Q^2 \rightarrow 0$ extrapolation. We obtain a radius of 0.844(7) fm, consistent with the high-precision muonic hydrogen results. |
hep-ph/9803268 | George Gogiberidze | G.L. Gogiberidze, L.K. Gelovani, E.K. Sarkisyan | Study of Multiparticle Spikes in Central 4.5A GeV/c C-Cu Collisions | 12 pages, LaTeX, 2 eps figs | Phys.Lett. B430 (1998) 368-374 | 10.1016/S0370-2693(98)00526-7 | null | hep-ph | null | An analysis of local fluctuations, or spikes, is performed for charged
particles produced in central C-Cu collisions at 4.5 GeV/$c$/nucleon. The
distributions of spike-centers and the maximum density distributions are
investigated for different narrow pseudorapidity windows to search for
multiparticle dynamical correlations. Two peaks over statistical background are
observed in the spike-center distributions with the structure similar to that
expected from the coherent gluon radiation model and recently found in hadronic
interactions. The dynamical contribution to maximum density fluctuations are
obtained to be hidden by statistical correlations, though behavior of the
distributions shows qualitative agreement with that from the one-dimensional
intermittency model. The observed features of the two different approaches,
coherent vs. stochastic, to the formation of the local dynamical fluctuations
are discussed.
| [
{
"created": "Fri, 6 Mar 1998 11:51:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gogiberidze",
"G. L.",
""
],
[
"Gelovani",
"L. K.",
""
],
[
"Sarkisyan",
"E. K.",
""
]
] | An analysis of local fluctuations, or spikes, is performed for charged particles produced in central C-Cu collisions at 4.5 GeV/$c$/nucleon. The distributions of spike-centers and the maximum density distributions are investigated for different narrow pseudorapidity windows to search for multiparticle dynamical correlations. Two peaks over statistical background are observed in the spike-center distributions with the structure similar to that expected from the coherent gluon radiation model and recently found in hadronic interactions. The dynamical contribution to maximum density fluctuations are obtained to be hidden by statistical correlations, though behavior of the distributions shows qualitative agreement with that from the one-dimensional intermittency model. The observed features of the two different approaches, coherent vs. stochastic, to the formation of the local dynamical fluctuations are discussed. |
1805.02664 | Jack Collins | Jack H. Collins, Kiel Howe, Benjamin Nachman | Anomaly Detection for Resonant New Physics with Machine Learning | Replaced with short PRL version. 7 pages, 2 figures. Revised long
version will be submitted separately | Phys. Rev. Lett. 121, 241803 (2018) | 10.1103/PhysRevLett.121.241803 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite extensive theoretical motivation for physics beyond the Standard
Model (BSM) of particle physics, searches at the Large Hadron Collider (LHC)
have found no significant evidence for BSM physics. Therefore, it is essential
to broaden the sensitivity of the search program to include unexpected
scenarios. We present a new model-agnostic anomaly detection technique that
naturally benefits from modern machine learning algorithms. The only
requirement on the signal for this new procedure is that it is localized in at
least one known direction in phase space. Any other directions of phase space
that are uncorrelated with the localized one can be used to search for
unexpected features. This new method is applied to the dijet resonance search
to show that it can turn a modest 2 sigma excess into a 7 sigma excess for a
model with an intermediate BSM particle that is not currently targeted by a
dedicated search.
| [
{
"created": "Mon, 7 May 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 9 May 2018 16:26:45 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Nov 2018 16:38:48 GMT",
"version": "v3"
}
] | 2019-03-21 | [
[
"Collins",
"Jack H.",
""
],
[
"Howe",
"Kiel",
""
],
[
"Nachman",
"Benjamin",
""
]
] | Despite extensive theoretical motivation for physics beyond the Standard Model (BSM) of particle physics, searches at the Large Hadron Collider (LHC) have found no significant evidence for BSM physics. Therefore, it is essential to broaden the sensitivity of the search program to include unexpected scenarios. We present a new model-agnostic anomaly detection technique that naturally benefits from modern machine learning algorithms. The only requirement on the signal for this new procedure is that it is localized in at least one known direction in phase space. Any other directions of phase space that are uncorrelated with the localized one can be used to search for unexpected features. This new method is applied to the dijet resonance search to show that it can turn a modest 2 sigma excess into a 7 sigma excess for a model with an intermediate BSM particle that is not currently targeted by a dedicated search. |
hep-ph/0111326 | Raymond R. Volkas | Raymond R. Volkas | Introduction to sterile neutrinos | 14 pages, latex. Invited lecture at the "International School of
Nuclear Physics, 23rd Course: Neutrinos in Astro, Particle and Nuclear
Physics", Erice, Italy, 18-26 Sept 2001. To appear in Progress in Particle
and Nuclear Physics | Prog.Part.Nucl.Phys. 48 (2002) 161-174 | 10.1016/S0146-6410(02)00122-9 | null | hep-ph | null | Model-building issues raised by the prospect of light sterile neutrinos are
discussed in a pedagogical way. I first review the na\"{\i}ve proposal that
sterile neutrinos be identified with ``right handed neutrinos''. A critical
discussion of the simple expedient of adding three gauge singlet fermions to
the usual minimal standard model matter content is followed by an examination
of right handed neutrinos in extended theories. I introduce the terminology of
``fully sterile'' and ``weakly sterile'' to classify varieties usually
conflated under the sterile neutrino banner. After introducing the concepts of
``technical naturalness'' and plain ``naturalness'', the unbearable lightness
of being a sterile neutrino is confronted. This problem is used to motivate
mirror neutrinos, whose connection with pairwise maximal mixing is emphasised.
Some brief remarks about phenomenology are made throughout. The impossibility
of identifying the sole sterile neutrino of the currently favoured $2 + 2$ and
$3 + 1$ phenomenological constructs as a lone gauge singlet fermion added to
the minimal standard model is explained. Finally, I remark on the beauty and
subtlety of light sterile neutrino cosmology.
| [
{
"created": "Mon, 26 Nov 2001 04:48:31 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Volkas",
"Raymond R.",
""
]
] | Model-building issues raised by the prospect of light sterile neutrinos are discussed in a pedagogical way. I first review the na\"{\i}ve proposal that sterile neutrinos be identified with ``right handed neutrinos''. A critical discussion of the simple expedient of adding three gauge singlet fermions to the usual minimal standard model matter content is followed by an examination of right handed neutrinos in extended theories. I introduce the terminology of ``fully sterile'' and ``weakly sterile'' to classify varieties usually conflated under the sterile neutrino banner. After introducing the concepts of ``technical naturalness'' and plain ``naturalness'', the unbearable lightness of being a sterile neutrino is confronted. This problem is used to motivate mirror neutrinos, whose connection with pairwise maximal mixing is emphasised. Some brief remarks about phenomenology are made throughout. The impossibility of identifying the sole sterile neutrino of the currently favoured $2 + 2$ and $3 + 1$ phenomenological constructs as a lone gauge singlet fermion added to the minimal standard model is explained. Finally, I remark on the beauty and subtlety of light sterile neutrino cosmology. |
1408.3411 | Gokce Basar | Gokce Basar, Derek Teaney | A scaling relation between proton-nucleus and nucleus-nucleus collisions | 4 pages, 2 figures, proceedings for Quark Matter XXIV, May 19-24
2014, Darmstadt | null | 10.1016/j.nuclphysa.2014.08.058 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is recently discovered that at high multiplicy, the proton-nucleus ($pA$)
collisions give rise to two particle correlations that are strikingly similar
to those of nucleus-nucleus ($AA$) collisions at the same multiplicity,
although the system size is smaller in $pA$. Using an independent cluster model
and a simple conformal scaling argument, where the ratio of the mean free path
to the system size stays constant at fixed multiplicity, we argue that flow in
$pA$ emerges as a collective response to the fluctuations in the position of
clusters, just like in $AA$ collisions. With several physically motivated and
parameter free rescalings of the recent LHC data, we show that this simple
model captures the essential physics of elliptic and triangular flow in $pA$
collisions.
| [
{
"created": "Thu, 14 Aug 2014 20:00:02 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Basar",
"Gokce",
""
],
[
"Teaney",
"Derek",
""
]
] | It is recently discovered that at high multiplicy, the proton-nucleus ($pA$) collisions give rise to two particle correlations that are strikingly similar to those of nucleus-nucleus ($AA$) collisions at the same multiplicity, although the system size is smaller in $pA$. Using an independent cluster model and a simple conformal scaling argument, where the ratio of the mean free path to the system size stays constant at fixed multiplicity, we argue that flow in $pA$ emerges as a collective response to the fluctuations in the position of clusters, just like in $AA$ collisions. With several physically motivated and parameter free rescalings of the recent LHC data, we show that this simple model captures the essential physics of elliptic and triangular flow in $pA$ collisions. |
hep-ph/0610434 | Hanqing Zheng | Zhi-Hui Guo, L. Y. Xiao and H. Q. Zheng | Is the $f_0(600)$ meson a dynamically generated resonance? -- a lesson
learned from the O(N) model and beyond | 15 pages, 3 figurs; references added; discussions slightly modified;
revised version accepted by IJMPA | Int.J.Mod.Phys.A22:4603-4616,2007 | 10.1142/S0217751X0703710X | null | hep-ph | null | O(N) linear $\sigma$ model is solvable in the large $N$ limit and hence
provides a useful theoretical laboratory to test various unitarization
approximations. We find that the large $N_c$ limit and the $m_\sigma\to \infty$
limit do not commute. In order to get the correct large $N_c$ spectrum one has
to firstly take the large $N_c$ limit. We argue that the $f_0(600)$ meson may
not be described as generated dynamically. On the contrary, it is most
appropriately described at the same level as the pions, i.e, both appear
explicitly in the effective lagrangian. Actually it is very likely the $\sigma$
meson responsible for the spontaneous chiral symmetry breaking in a lagrangian
with linearly realized chiral symmetry.
| [
{
"created": "Tue, 31 Oct 2006 15:14:42 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jun 2007 02:55:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Guo",
"Zhi-Hui",
""
],
[
"Xiao",
"L. Y.",
""
],
[
"Zheng",
"H. Q.",
""
]
] | O(N) linear $\sigma$ model is solvable in the large $N$ limit and hence provides a useful theoretical laboratory to test various unitarization approximations. We find that the large $N_c$ limit and the $m_\sigma\to \infty$ limit do not commute. In order to get the correct large $N_c$ spectrum one has to firstly take the large $N_c$ limit. We argue that the $f_0(600)$ meson may not be described as generated dynamically. On the contrary, it is most appropriately described at the same level as the pions, i.e, both appear explicitly in the effective lagrangian. Actually it is very likely the $\sigma$ meson responsible for the spontaneous chiral symmetry breaking in a lagrangian with linearly realized chiral symmetry. |
2204.10274 | Julian Heeck | Julian Heeck | W-boson mass in the triplet seesaw model | 6 pages; extended discussion, to appear in PRD | Phys. Rev. D 106 (2022), 015004 | 10.1103/PhysRevD.106.015004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CDF collaboration has recently published a precision measurement of the
W-boson mass that differs from the Standard Model prediction by seven standard
deviations. This result can be explained with additional electroweak multiplets
that either break the custodial symmetry or contribute to oblique parameters at
loop level. Here, we study one of the best-motivated scenarios involving new
multiplets: the type-II seesaw model, which involves a scalar triplet that
generates Majorana neutrino masses and can furthermore resolve the W-boson mass
discrepancy. This favors a doubly-charged scalar with mass between 100 and 200
GeV as well as other scalars with a fixed mass splitting. The entire preferred
parameter space is testable at the LHC.
| [
{
"created": "Thu, 21 Apr 2022 17:19:15 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 13:21:06 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jun 2022 06:52:40 GMT",
"version": "v3"
}
] | 2022-07-08 | [
[
"Heeck",
"Julian",
""
]
] | The CDF collaboration has recently published a precision measurement of the W-boson mass that differs from the Standard Model prediction by seven standard deviations. This result can be explained with additional electroweak multiplets that either break the custodial symmetry or contribute to oblique parameters at loop level. Here, we study one of the best-motivated scenarios involving new multiplets: the type-II seesaw model, which involves a scalar triplet that generates Majorana neutrino masses and can furthermore resolve the W-boson mass discrepancy. This favors a doubly-charged scalar with mass between 100 and 200 GeV as well as other scalars with a fixed mass splitting. The entire preferred parameter space is testable at the LHC. |
1501.04385 | Nguyen Thi Thuy | P. V. Dong, C. S. Kim, D. V. Soa, N. T. Thuy | Investigation of Dark Matter in Minimal 3-3-1 Models | 37 pages, 10 figures; final version accepted to Physical Review D
(2015) | Phys. Rev. D 91, 115019 (2015) | 10.1103/PhysRevD.91.115019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the 3-3-1 model with the minimal lepton content can work as
two-Higgs-triplet 3-3-1 model while leaving the other scalars as inert
particles responsible for dark matter. We study two cases of dark matter
corresponding to the doublet and singlet scalar candidates. We figure out the
parameter spaces in the WMAP allowed region of the relic density. The indirect
and direct searches for dark matter in both cases are investigated by using
micrOMEGAs.
| [
{
"created": "Mon, 19 Jan 2015 04:41:43 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2015 03:21:19 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Dong",
"P. V.",
""
],
[
"Kim",
"C. S.",
""
],
[
"Soa",
"D. V.",
""
],
[
"Thuy",
"N. T.",
""
]
] | It is shown that the 3-3-1 model with the minimal lepton content can work as two-Higgs-triplet 3-3-1 model while leaving the other scalars as inert particles responsible for dark matter. We study two cases of dark matter corresponding to the doublet and singlet scalar candidates. We figure out the parameter spaces in the WMAP allowed region of the relic density. The indirect and direct searches for dark matter in both cases are investigated by using micrOMEGAs. |
1804.00111 | Bryan Ostdiek | Timothy Cohen, Walter Hopkins, Stephanie Majewski, and Bryan Ostdiek | Magnifying the ATLAS Stealth Stop Splinter: Impact of Spin Correlations
and Finite Widths | 33 pages, 14 figures | null | 10.1007/JHEP07(2018)142 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we recast a "stealth stop" search in the notoriously difficult
region of the stop-neutralino Simplified Model parameter space for which
$m(\tilde{t}) - m(\tilde{\chi}) \simeq m_t$. The properties of the final state
are nearly identical for tops and stops, while the rate for stop pair
production is $\mathcal{O}(10\%)$ of that for $t\bar{t}$. Stop searches away
from this stealth region have left behind a "splinter" of open parameter space
when $m(\tilde{t}) \simeq m_t$. Removing this splinter requires surgical
precision: the ATLAS constraint on stop pair production reinterpreted here
treats the signal as a contaminant to the measurement of the top pair
production cross section using data from $\sqrt{s} = 7 \text{ TeV}$ and $8
\text{ TeV}$ in a correlated way to control for some systematic errors. ATLAS
fixed $m(\tilde{t}) \simeq m_t$ and $m(\tilde{\chi})= 1 \text{ GeV}$, implying
that a careful recasting of these results into the full $m(\tilde{t}) -
m(\tilde{\chi})$ plane is warranted. We find that the parameter space with
$m(\tilde{\chi})\lesssim 55 \text{ GeV}$ is excluded for $m(\tilde{t}) \simeq
m_t$ --- although this search does cover new parameter space, it is unable to
fully pull the splinter. Along the way, we review a variety of interesting
physical issues in detail: (i) when the two-body width is a good approximation;
(ii) what the impact on the total rate from taking the narrow width is a good
approximation; (iii) how the production rate is affected when the wrong widths
are used; (iv) what role the spin correlations play in the limits. In addition,
we provide a guide to using MadGraph for implementing the full production
including finite width and spin correlation effects, and we survey a variety of
pitfalls one might encounter.
| [
{
"created": "Sat, 31 Mar 2018 03:09:20 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Cohen",
"Timothy",
""
],
[
"Hopkins",
"Walter",
""
],
[
"Majewski",
"Stephanie",
""
],
[
"Ostdiek",
"Bryan",
""
]
] | In this paper, we recast a "stealth stop" search in the notoriously difficult region of the stop-neutralino Simplified Model parameter space for which $m(\tilde{t}) - m(\tilde{\chi}) \simeq m_t$. The properties of the final state are nearly identical for tops and stops, while the rate for stop pair production is $\mathcal{O}(10\%)$ of that for $t\bar{t}$. Stop searches away from this stealth region have left behind a "splinter" of open parameter space when $m(\tilde{t}) \simeq m_t$. Removing this splinter requires surgical precision: the ATLAS constraint on stop pair production reinterpreted here treats the signal as a contaminant to the measurement of the top pair production cross section using data from $\sqrt{s} = 7 \text{ TeV}$ and $8 \text{ TeV}$ in a correlated way to control for some systematic errors. ATLAS fixed $m(\tilde{t}) \simeq m_t$ and $m(\tilde{\chi})= 1 \text{ GeV}$, implying that a careful recasting of these results into the full $m(\tilde{t}) - m(\tilde{\chi})$ plane is warranted. We find that the parameter space with $m(\tilde{\chi})\lesssim 55 \text{ GeV}$ is excluded for $m(\tilde{t}) \simeq m_t$ --- although this search does cover new parameter space, it is unable to fully pull the splinter. Along the way, we review a variety of interesting physical issues in detail: (i) when the two-body width is a good approximation; (ii) what the impact on the total rate from taking the narrow width is a good approximation; (iii) how the production rate is affected when the wrong widths are used; (iv) what role the spin correlations play in the limits. In addition, we provide a guide to using MadGraph for implementing the full production including finite width and spin correlation effects, and we survey a variety of pitfalls one might encounter. |
hep-ph/0006261 | Nikolai Romanenko | K. Huitu, J. Laitinen, J.Maalampi and N. Romanenko (Helsinki Institute
of Physics and Department of Physics, FIN-00014 University of Helsinki,
Finland) | Singly charged higgses at linear collider | 22 pages 9 figures | Nucl.Phys.B598:13-29,2001 | 10.1016/S0550-3213(00)00715-X | Helsinki Institute of Physics HIP-2000-06/TH | hep-ph | null | We consider the production of singly charged Higgs bosons in the Higgs
triplet and two Higgs doublet models. We evaluate the cross sections for the
pair production and the single production of charged higgses at linear
collider. The decay modes of $H^+$ and the Standard Model backgrounds are
considered. We analyze the possibilities to differentiate between triplet and
two Higgs doublet models.
| [
{
"created": "Thu, 22 Jun 2000 15:51:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Huitu",
"K.",
"",
"Helsinki Institute\n of Physics and Department of Physics, FIN-00014 University of Helsinki,\n Finland"
],
[
"Laitinen",
"J.",
"",
"Helsinki Institute\n of Physics and Department of Physics, FIN-00014 University of Helsinki,\n Finland"
],
[
"Maalampi",
"J.",
"",
"Helsinki Institute\n of Physics and Department of Physics, FIN-00014 University of Helsinki,\n Finland"
],
[
"Romanenko",
"N.",
"",
"Helsinki Institute\n of Physics and Department of Physics, FIN-00014 University of Helsinki,\n Finland"
]
] | We consider the production of singly charged Higgs bosons in the Higgs triplet and two Higgs doublet models. We evaluate the cross sections for the pair production and the single production of charged higgses at linear collider. The decay modes of $H^+$ and the Standard Model backgrounds are considered. We analyze the possibilities to differentiate between triplet and two Higgs doublet models. |
hep-ph/9403220 | George Triantaphyllou | George Triantaphyllou (University of Toronto) | A New Paradigm for the Fermion Generations | 36 pages, LaTeX, minor typographical corrections and explanatory
remarks added, version published in Helvetica Physica Acta, 67, No. 6
(October 1994) | Helv.Phys.Acta 67 (1994) 660-682 | null | UTPT-94-06 | hep-ph | null | A new mechanism is proposed to explain the appearance of the three known
fermion generations in a natural way. The underlying idea is based on the
discreteness of the spectrum of solutions of the gap equation appearing in
models of dynamical chiral symmetry breaking. Within such a framework, the
number of parameters needed to describe the experimentally observed fermion
spectrum is drastically reduced. The phenomenological consequences of such a
mechanism are carefully discussed, in order to explore its viability.
| [
{
"created": "Thu, 3 Mar 1994 14:37:34 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 1994 18:55:50 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Triantaphyllou",
"George",
"",
"University of Toronto"
]
] | A new mechanism is proposed to explain the appearance of the three known fermion generations in a natural way. The underlying idea is based on the discreteness of the spectrum of solutions of the gap equation appearing in models of dynamical chiral symmetry breaking. Within such a framework, the number of parameters needed to describe the experimentally observed fermion spectrum is drastically reduced. The phenomenological consequences of such a mechanism are carefully discussed, in order to explore its viability. |
2306.07315 | Kunfeng Lyu | Yohei Ema, Zhen Liu, Kun-Feng Lyu and Maxim Pospelov | Heavy Neutral Leptons from Stopped Muons and Pions | 13 pages, 2 figures | null | null | UMN-TH-4217/23, FTPI-MINN-23-10 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Stopped muons, which are generic in pion-at-rest experiments, can shed light
on heavy neutral leptons (HNLs) in unexplored parameter spaces. If the HNL is
lighter than the muon, the HNL can be produced from decays of muons and
pions.The HNL will travel from the production location and decay into visible
Standard Model (SM) modes, leaving signals inside downstream detectors. We find
that in the case that the HNL dominantly mixes with muon neutrinos, the LSND
constraint on the mixing angle squared is stronger than all the previous
constraints by more than an order of magnitude. In this study, we recast the
LSND measurement of the $\nu-e$ scattering. Future experiments such as PIP2-BD
could further improve the sensitivity, provided they can distinguish the HNL
events from backgrounds induced by the SM neutrinos.
| [
{
"created": "Mon, 12 Jun 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-06-14 | [
[
"Ema",
"Yohei",
""
],
[
"Liu",
"Zhen",
""
],
[
"Lyu",
"Kun-Feng",
""
],
[
"Pospelov",
"Maxim",
""
]
] | Stopped muons, which are generic in pion-at-rest experiments, can shed light on heavy neutral leptons (HNLs) in unexplored parameter spaces. If the HNL is lighter than the muon, the HNL can be produced from decays of muons and pions.The HNL will travel from the production location and decay into visible Standard Model (SM) modes, leaving signals inside downstream detectors. We find that in the case that the HNL dominantly mixes with muon neutrinos, the LSND constraint on the mixing angle squared is stronger than all the previous constraints by more than an order of magnitude. In this study, we recast the LSND measurement of the $\nu-e$ scattering. Future experiments such as PIP2-BD could further improve the sensitivity, provided they can distinguish the HNL events from backgrounds induced by the SM neutrinos. |
2206.14394 | We-Fu Chang | We-Fu Chang and Shih-Hsien Kuo | Possibly heteroclite electron Yukawa coupling and small $\triangle
a_\mu$ in a hidden Abelian gauge model for neutrino masses | 32 pages, 10 figures. References added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt to simultaneously explain the neutrino oscillation data and the
observed $(g-2)_{e,\mu}$ in a hidden gauge $U(1)_X$ model where all the
Standard Model(SM) fields are $U(1)_X$ singlets. The minimal version of this
model calls for four exotic scalars and two pairs of vector fermions, and all
are charged under $U(1)_X$. We carefully consider the experimental limits on
charge lepton flavor violation without assuming any flavor symmetry and explore
the viable model parameter space. The model can accommodate the neutrino
oscillation data for both the normal and the inverted mass ordering while
explaining the central value of $\triangle a_e$ by adopting the fine structure
constant determined by using either Cesium or Rubidium atoms. However, mainly
constrained by the current experimental bound on ${\cal B}(\tau\rightarrow \mu
\gamma)$, this model predicts $\triangle a_\mu <5.5(8.0)\times 10^{-10}$ for
the normal(inverted) neutrino ordering. Moreover, while the muon Yukawa
coupling is close to the SM one, we find the magnitude of the electron Yukawa
coupling could be one order of magnitude larger than the SM prediction. This
abnormal electron Yukawa could be probed in the future FCC-ee collider and
plays an essential role in testing flavor physics.
| [
{
"created": "Wed, 29 Jun 2022 04:20:13 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2022 08:15:05 GMT",
"version": "v2"
}
] | 2022-07-12 | [
[
"Chang",
"We-Fu",
""
],
[
"Kuo",
"Shih-Hsien",
""
]
] | We attempt to simultaneously explain the neutrino oscillation data and the observed $(g-2)_{e,\mu}$ in a hidden gauge $U(1)_X$ model where all the Standard Model(SM) fields are $U(1)_X$ singlets. The minimal version of this model calls for four exotic scalars and two pairs of vector fermions, and all are charged under $U(1)_X$. We carefully consider the experimental limits on charge lepton flavor violation without assuming any flavor symmetry and explore the viable model parameter space. The model can accommodate the neutrino oscillation data for both the normal and the inverted mass ordering while explaining the central value of $\triangle a_e$ by adopting the fine structure constant determined by using either Cesium or Rubidium atoms. However, mainly constrained by the current experimental bound on ${\cal B}(\tau\rightarrow \mu \gamma)$, this model predicts $\triangle a_\mu <5.5(8.0)\times 10^{-10}$ for the normal(inverted) neutrino ordering. Moreover, while the muon Yukawa coupling is close to the SM one, we find the magnitude of the electron Yukawa coupling could be one order of magnitude larger than the SM prediction. This abnormal electron Yukawa could be probed in the future FCC-ee collider and plays an essential role in testing flavor physics. |
hep-ph/9710308 | Michael Chanowitz | Michael S. Chanowitz | Combining real and virtual Higgs boson mass constraints | 11 pages, Latex. Citations are added and paper is otherwise
reconciled with version to be published in Physical Review Letters | Phys.Rev.lett.80:2521-2524,1998 | 10.1103/PhysRevLett.80.2521 | LBNL-40877 | hep-ph hep-ex | null | Within the framework of the standard model we observe that there is a
significant discrepancy between the most precise $Z$ boson decay asymmetry
measurement and the limit from direct searches for Higgs boson production.
Using methods inspired by the Particle Data Group we explore the possible
effect on fits of the Higgs boson mass. In each case the central value and the
95% confidence level upper limit increase significantly relative to the
conventional fit. The results suggest caution in drawing conclusions about the
Higgs boson mass from the existing data.
| [
{
"created": "Thu, 9 Oct 1997 22:04:58 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Nov 1997 21:34:04 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Feb 1998 01:33:12 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Chanowitz",
"Michael S.",
""
]
] | Within the framework of the standard model we observe that there is a significant discrepancy between the most precise $Z$ boson decay asymmetry measurement and the limit from direct searches for Higgs boson production. Using methods inspired by the Particle Data Group we explore the possible effect on fits of the Higgs boson mass. In each case the central value and the 95% confidence level upper limit increase significantly relative to the conventional fit. The results suggest caution in drawing conclusions about the Higgs boson mass from the existing data. |
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