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Measurements of dielectron production in Au + Au collisions at sNN =200 GeV from the STAR experiment

Adamczyk, L.
•
Adkins, J. K.
•
Agakishiev, G.
altro
Zyzak, M.
2015
  • journal article

Periodico
PHYSICAL REVIEW. C, NUCLEAR PHYSICS
Abstract
We report on measurements of dielectron (e+e−) production in Au+Au collisions at a center-of-mass energy of 200 GeV per nucleon-nucleon pair using the STAR detector at BNL Relativistic Heavy Ion Collider. Systematic measurements of the dielectron yield as a function of transverse momentum (pT) and collision centrality show an enhancement compared to a cocktail simulation of hadronic sources in the low invariant-mass region (Mee<1GeV/c2). This enhancement cannot be reproduced by the ρ-meson vacuum spectral function. In minimum-bias collisions, in the invariant-mass range of 0.30–0.76GeV/c2, integrated over the full pT acceptance, the enhancement factor is 1.76±0.06(stat.)±0.26(sys.)±0.29(cocktail). The enhancement factor exhibits weak centrality and pT dependence in STAR's accessible kinematic regions, while the excess yield in this invariant-mass region as a function of the number of participating nucleons follows a power-law shape with a power of 1.44±0.10. Models that assume an in-medium broadening of the ρ-meson spectral function consistently describe the observed excess in these measurements. Additionally, we report on measurements of ω- and φ-meson production through their e+e− decay channel. These measurements show good agreement with Tsallis blast-wave model predictions, as well as, in the case of the φ meson, results through its K+K− decay channel. In the intermediate invariant-mass region (1.1<Mee<3GeV/c2), we investigate the spectral shapes from different collision centralities. Physics implications for possible in-medium modification of charmed hadron production and other physics sources are discussed.
DOI
10.1103/PhysRevC.92.024912
WOS
WOS:000359944200007
Archivio
http://hdl.handle.net/11368/2942034
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84940837769
http://harvest.aps.org/bagit/articles/10.1103/PhysRevC.92.024912/apsxml
Diritti
closed access
FVG url
https://arts.units.it/request-item?handle=11368/2942034
Soggetti
  • Nuclear and High Ener...

  • RHIC

  • STAR

  • heavy ion

  • quark gluon plasma

Web of Science© citazioni
68
Data di acquisizione
Mar 24, 2024
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