Sigma(0) production in proton nucleus collisions near threshold

0491106 - ÚJF 2019 RIV NL eng J - Článek v odborném periodiku
Adamczewski-Musch, J. - Agakishiev, G. - Arnold, O. - Krása, Antonín - Kugler, Andrej - Sobolev, Yuri, G. - Svoboda, Ondřej - Tlustý, Pavel - Wagner, Vladimír - Wendisch, C. … celkem 109 autorů
Sigma(0) production in proton nucleus collisions near threshold.
Physics Letters. B. Roč. 781, č. 6 (2018), s. 735-740. ISSN 0370-2693. E-ISSN 1873-2445
Grant CEP: GA ČR GA13-06759S; GA MŠMT LM2015049
Institucionální podpora: RVO:61389005
Klíčová slova: HADES collaboration * hyperons * strangeness
Obor OECD: Nuclear physics
Impakt faktor: 4.162, rok: 2018

The production of Sigma(0) baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to root sNN = 3.18 GeV) is studied with the detector set-up HADES at GSI, Darmstadt. Sigma(0)s were identified via the decay Sigma 0 -> Lambda gamma with subsequent decays Lambda -> p pi(-) in coincidence with a e(+)e(-) pair from either external (gamma -> e(+)e(-)) or internal (Dalitz decay gamma* -> e(+)e(-)) gamma conversions. The differential Sigma(0) cross section integrated over the detector acceptance, i.e. the rapidity interval 0.5 < y < 1.1, has been extracted as Delta sigma(Sigma 0) = 2.3 +/- (0.2)(stat) +/- ((+0.6)(-0.6))(sys) +/- (0.2)(norm) mB, yielding the inclusive production cross section in full phase space sigma(total)(Sigma 0) = 5.8 +/- (0.5)(stat) +/- ((+1.4)(-1.4))(sys) +/- (0.6)(norm) +/- (1.7)(extrapol) mb by averaging over different extrapolation methods. The Lambda(all)/Sigma(0) ratio within the HADES acceptance is equal to 2.3 +/- (0.2)(stat) +/- ((+0.6)(-0.6))(sys). The obtained rapidity and momentum distributions are compared to transport model calculations. The Sigma(0) yield agrees with the statistical model of particle production in nuclear reactions.
Trvalý link: http://hdl.handle.net/11104/0285178