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Measurements of dielectron production in Au + Au collisions at sNN =200 GeV from the STAR experiment
Adamczyk, L Adkins, JK Agakishiev, G Aggarwal, MM Ahammed, Z Alekseev, I Alford, J Aparin, A Arkhipkin, D Aschenauer, EC
Adamczyk, L
Adkins, JK
Agakishiev, G
Aggarwal, MM
Ahammed, Z
Alekseev, I
Alford, J
Aparin, A
Arkhipkin, D
Aschenauer, EC
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Journal Article
Date
2015-08-24
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10.1103/PhysRevC.92.024912
Abstract
© 2015 American Physical Society. ©2015 American Physical Society. 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.
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Physical Review C - Nuclear Physics
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