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

0501342 - FZÚ 2019 RIV US eng J - Journal Article
Adare, A. - Aidala, C. - Ajitanand, N.N. - Tomášek, Michal - Tomášek, Lukáš - Vrba, Václav … Total 447 authors
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
Institutional support: RVO:68378271
Keywords : RICH * PHENIX * CERES * experimental results * PYTHIA * NA60 * CERN SPS * numerical calculations * 200 GeV/nucleon
OECD category: Particles and field physics
Impact factor: 3.820, year: 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.

Permanent Link: http://hdl.handle.net/11104/0293331