Searching a dark photon with HADES

Agakishiev, G.; Balanda, A.; Belver, D.; Belyaev, A.; Berger-Chen, J. C.; Blanco, A.; Böhmer, M.; Boyard, J. L.; Cabanelas, P.; Chernenko, S.; Dybczak, A.; Epple, E.; Fabbietti, L.; Fateev, O.; Krása, Antonín; Křížek, Filip; Kugler, Andrej; Sobolev, Yuri, G.; Tlustý, Pavel; Wagner, Vladimír

doi:https://dx.doi.org/10.1016/j.physletb.2014.02.035

Number of the records: 1

Searching a dark photon with HADES

1.

SYSNO ASEP	0428220
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Searching a dark photon with HADES
Author(s)	Agakishiev, G. (RU) Balanda, A. (PL) Belver, D. (ES) Belyaev, A. (RU) Berger-Chen, J. C. (DE) Blanco, A. (PT) Böhmer, M. (DE) Boyard, J. L. (FR) Cabanelas, P. (ES) Chernenko, S. (RU) Dybczak, A. (PL) Epple, E. (DE) Fabbietti, L. (DE) Fateev, O. (RU) Krása, Antonín (UJF-V) Křížek, Filip (UJF-V)_{RID, ORCID, SAI} Kugler, Andrej (UJF-V)_{RID, ORCID, SAI} Sobolev, Yuri, G. (UJF-V)_ORCID Tlustý, Pavel (UJF-V)_{ORCID, SAI} Wagner, Vladimír (UJF-V)_{RID, ORCID, SAI}
Number of authors	100
Source Title	Physics Letters. B. - : Elsevier - ISSN 0370-2693 Roč. 731, APR (2014), s. 265-271
Number of pages	6 s.
Publication form	Print - P
Language	eng - English
Country	NL - Netherlands
Keywords	HADES ; dark photon ; hidden sector ; dark matter ; rare eta decays
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
R&D Projects	GA13-06759S GA ČR - Czech Science Foundation (CSF)
	LG14004 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Institutional support	UJF-V - RVO:61389005
UT WOS	000334094500041
DOI	10.1016/j.physletb.2014.02.035
Annotation	We present a search for the e(+)e(-) decay of a hypothetical dark photon, also named U vector boson, in inclusive dielectron spectra measured by HADES in the p(3.5 GeV) + p, Nb reactions, as well as the Ar (1.756 GeV/u) KCl reaction. An upper limit on the kinetic mixing parameter squared epsilon(2) at 90% CL has been obtained for the mass range M-U = 0.02-0.55 GeV/c(2) and is compared with the present world data set. For masses 0.03-0.1 GeV/c(2), the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favored by the muon g - 2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 x 10(-6) has been set on the helicity-suppressed direct decay of the eta meson, eta --> e(+)e(-), at 90% CL.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2015

Number of the records: 1