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Dielectron mass spectra from Au+Au collisions at sNN =200 GeV

  • Author(s): Adamczyk, L
  • Adkins, JK
  • Agakishiev, G
  • Aggarwal, MM
  • Ahammed, Z
  • Alekseev, I
  • Alford, J
  • Anson, CD
  • Aparin, A
  • Arkhipkin, D
  • Aschenauer, EC
  • Averichev, GS
  • Banerjee, A
  • Barnovska, Z
  • Beavis, DR
  • Bellwied, R
  • Bhasin, A
  • Bhati, AK
  • Bhattarai, P
  • Bichsel, H
  • Bielcik, J
  • Bielcikova, J
  • Bland, LC
  • Bordyuzhin, IG
  • Borowski, W
  • Bouchet, J
  • Brandin, AV
  • Brovko, SG
  • Bültmann, S
  • Bunzarov, I
  • Burton, TP
  • Butterworth, J
  • Caines, H
  • Calderón De La Barca Sánchez, M
  • Cebra, D
  • Cendejas, R
  • Cervantes, MC
  • Chaloupka, P
  • Chang, Z
  • Chattopadhyay, S
  • Chen, HF
  • Chen, JH
  • Chen, L
  • Cheng, J
  • Cherney, M
  • Chikanian, A
  • Christie, W
  • Chwastowski, J
  • Codrington, MJM
  • Cramer, JG
  • Crawford, HJ
  • Cui, X
  • Das, S
  • Davila Leyva, A
  • De Silva, LC
  • Debbe, RR
  • Dedovich, TG
  • Deng, J
  • Derevschikov, AA
  • Derradi De Souza, R
  • Dhamija, S
  • Di Ruzza, B
  • Didenko, L
  • Dilks, C
  • Ding, F
  • Djawotho, P
  • Dong, X
  • Drachenberg, JL
  • Draper, JE
  • Du, CM
  • Dunkelberger, LE
  • Dunlop, JC
  • Efimov, LG
  • Engelage, J
  • Engle, KS
  • Eppley, G
  • Eun, L
  • Evdokimov, O
  • Fatemi, R
  • Fazio, S
  • Fedorisin, J
  • Filip, P
  • Finch, E
  • Fisyak, Y
  • Flores, CE
  • Gagliardi, CA
  • Gangadharan, DR
  • Garand, D
  • Geurts, F
  • Gibson, A
  • Girard, M
  • Gliske, S
  • Grosnick, D
  • Guo, Y
  • Gupta, A
  • Gupta, S
  • Guryn, W
  • Haag, B
  • Hajkova, O
  • Hamed, A
  • et al.
Abstract

We report the STAR measurements of dielectron (e+e-) production at midrapidity (|yee|<1) in Au+Au collisions at sNN=200GeV. The measurements are evaluated in different invariant mass regions with a focus on 0.30-0.76 (ρ-like), 0.76-0.80 (ω-like), and 0.98-1.05 (φ-like) GeV/c2. The spectrum in the ω-like and φ-like regions can be well described by the hadronic cocktail simulation. In the ρ-like region, however, the vacuum ρ spectral function cannot describe the shape of the dielectron excess. In this range, an enhancement of 1.77±0.11(stat)±0.24(syst)±0. 33(cocktail) is determined with respect to the hadronic cocktail simulation that excludes the ρ meson. The excess yield in the ρ-like region increases with the number of collision participants faster than the ω and φ yields. Theoretical models with broadened ρ contributions through interactions with constituents in the hot QCD medium provide a consistent description of the dilepton mass spectra for the measurement presented here and the earlier data at the Super Proton Synchrotron energies. © 2014 American Physical Society.

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