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

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    Genre
    Journal Article
    Date
    2014-07-09
    Author
    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
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    Subject
    STAR Collaboration
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5874
    
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    Show full item record
    DOI
    10.1103/PhysRevLett.113.022301
    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.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review Letters
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5856
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