Dielectron production in Au+Au collisions at √.sup.s./sup.NN=200 GeV

0501342 - FZÚ 2019 RIV US eng J - Článek v odborném periodiku
Adare, A. - Aidala, C. - Ajitanand, N.N. - Tomášek, Michal - Tomášek, Lukáš - Vrba, Václav … celkem 447 autorů
Dielectron production in Au+Au collisions at √^sNN=200 GeV.
Physical Review C. Roč. 93, č. 1 (2016), s. 1-34, č. článku 014904. ISSN 2469-9985. E-ISSN 2469-9993
Institucionální podpora: RVO:68378271
Klíčová slova: RICH * PHENIX * CERES * experimental results * PYTHIA * NA60 * CERN SPS * numerical calculations * 200 GeV/nucleon
Obor OECD: Particles and field physics
Impakt faktor: 3.820, rok: 2016

We present measurements of e+e− production at midrapidity in Au+Au collisions at sNN=200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (mee<5 GeV/c2) and pair transverse momentum (pT<5 GeV/c) for minimum bias and for five centrality classes. The e+e− yield is compared to the expectations from known sources. In the low-mass region (mee=0.30–0.76 GeV/c2) there is an enhancement that increases with centrality and is distributed over the entire pair pT range measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts to 2.3±0.4(stat)±0.4(syst)±0.2(model) or to 1.7±0.3(stat)±0.3(syst)±0.2(model) for minimum bias collisions when the open heavy-flavor contribution is calculated with pythia or mc@nlo, respectively.

Trvalý link: http://hdl.handle.net/11104/0293331