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

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    Genre
    Journal Article
    Date
    2015-08-24
    Author
    Adamczyk, L
    Adkins, JK
    Agakishiev, G
    Aggarwal, MM
    Ahammed, Z
    Alekseev, I
    Alford, J
    Aparin, A
    Arkhipkin, D
    Aschenauer, EC
    Averichev, GS
    Banerjee, A
    Bellwied, R
    Bhasin, A
    Bhati, AK
    Bhattarai, P
    Bielcik, J
    Bielcikova, J
    Bland, LC
    Bordyuzhin, IG
    Bouchet, J
    Brandin, AV
    Bunzarov, I
    Burton, TP
    Butterworth, J
    Caines, H
    Calderón De La Barca Sánchez, M
    Campbell, JM
    Cebra, D
    Cervantes, MC
    Chakaberia, I
    Chaloupka, P
    Chang, Z
    Chattopadhyay, S
    Chen, JH
    Chen, X
    Cheng, J
    Cherney, M
    Christie, W
    Contin, G
    Crawford, HJ
    Das, S
    De Silva, LC
    Debbe, RR
    Dedovich, TG
    Deng, J
    Derevschikov, AA
    Di Ruzza, B
    Didenko, L
    Dilks, C
    Dong, X
    Drachenberg, JL
    Draper, JE
    Du, CM
    Dunkelberger, LE
    Dunlop, JC
    Efimov, LG
    Engelage, J
    Eppley, G
    Esha, R
    Evdokimov, O
    Eyser, O
    Fatemi, R
    Fazio, S
    Federic, P
    Fedorisin, J
    Feng, Z
    Filip, P
    Fisyak, Y
    Flores, CE
    Fulek, L
    Gagliardi, CA
    Garand, D
    Geurts, F
    Gibson, A
    Girard, M
    Greiner, L
    Grosnick, D
    Gunarathne, DS
    Guo, Y
    Gupta, S
    Gupta, A
    Guryn, W
    Hamad, A
    Hamed, A
    Haque, R
    Harris, JW
    He, L
    Heppelmann, S
    Heppelmann, S
    Hirsch, A
    Hoffmann, GW
    Hofman, DJ
    Horvat, S
    Huang, B
    Huang, X
    Huang, HZ
    Huck, P
    Humanic, TJ
    Igo, G
    Show allShow less
    Subject
    hep-ex
    hep-ex
    nucl-ex
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5776
    
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    DOI
    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.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review C - Nuclear Physics
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    For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5758
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