Dielectron azimuthal anisotropy at mid-rapidity in Au+Au collisions at sNN =200 GeV

L Adamczyk,J K Adkins,G Agakishiev,M M Aggarwal,Z Ahammed,I Alekseev,J Alford,C Anson,A Aparin,D Arkhipkin,E C Aschenauer,G S Averichev,A Banerjee, Beavis,R Bellwied,A Bhasin,A K Bhati,P Bhattarai,H Bichsel,J Bielcik,J Bielcikova,L C Bland,I G Bordyuzhin,W Borowski,J Bouchet,A V Brandin,S G Brovko,S Bultmann,I Bunzarov,T P Burton,J M Butterworth,H Caines,M Calderon De La Barca Sanchez,D Cebra,R Cendejas,M C Cervantes,P Chaloupka,Z Chang,Surojit Chattopadhyay, H F Chen, J H Chen,Lei Chen,J Cheng,M Cherney,A Chikanian,W Christie,J Chwastowski,M J M Codrington,G Contin,J G Cramer,H J Crawford,Xuefeng Cui,S Das,A Davila Leyva,L C De Silva,R Debbe,T G Dedovich,Jun Deng,A A Derevschikov,R Derradi De Souza,S Dhamija,B Di Ruzza,L Didenko,C Dilks,F Ding,P Djawotho,Xiaowu Dong,J L Drachenberg,J E Draper,C M Du,L E Dunkelberger,J C Dunlop,L G Efimov,J Engelage,K S Engle,G Eppley,L Eun,O Evdokimov,O Eyser,R Fatemi,S Fazio,J Fedorisin,P Filip,E Finch,Y Fisyak,C E Flores,C A Gagliardi, Gangadharan,D Garand,F J M Geurts,A Gibson,Mario Fusco Girard,S Gliske,L Greiner,D Grosnick,D S Gunarathne,Yong Guo,A Gupta,Sanjeev Gupta,W Guryn

PHYSICAL REVIEW C（2014）

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摘要

We report on the first measurement of the azimuthal anisotropy (v(2)) of dielectrons (e(+)e(-) pairs) at mid-rapidity fromv root s(NN) = 200 GeV Au + Au collisions with the STAR detector at the Relativistic Heavy Ion Collider (RHIC), presented as a function of transverse momentum (pT) for different invariant-mass regions. In the mass region M-ee < 1.1 GeV/c(2) the dielectron v(2) measurements are found to be consistent with expectations from pi(0), eta, omega, and phi decay contributions. In the mass region 1.1 < M-ee < 2.9 GeV/c(2), the measured dielectron v(2) is consistent, within experimental uncertainties, with that from the c<(c)over bar> contributions.

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