System size and energy dependence of near-side dihadron correlations
Two-particle azimuthal (Δφ) and pseudorapidity (Δη) correlations using a trigger particle with large transverse momentum (p T) in d+Au, Cu+Cu, and Au+Au collisions at √sNN = 62.4 GeV and 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider are presented. The near-side correlation is separated into a jet-like component, narrow in both Δφ and Δη, and the ridge, narrow in Δφ but broad in Δη. Both components are studied as a function of collision centrality, and the jet-like correlation is studied as a function of the trigger and associated pT. The behavior of the jet-like component is remarkably consistent for different collision systems, suggesting it is produced by fragmentation. The width of the jet-like correlation is found to increase with the system size. The ridge, previously observed in Au+Au collisions at √sNN = 200 GeV, is also found in Cu+Cu collisions and in collisions at √sNN = 62.4 GeV, but is found to be substantially smaller at √sNN = 62.4 GeV than at √sNN = 200 GeV for the same average number of participants (Npart). Measurements of the ridge are compared to models. © 2012 American Physical Society.
Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alakhverdyants, AV; Alekseev, I; Alford, J; Anderson, BD; Anson, CD; Arkhipkin, D; Averichev, GS; Balewski, J; Barnby, LS; Beavis, DR; Bellwied, R; Betancourt, MJ; Betts, RR; Bhasin, A; Bhati, AK; Bichsel, H; Bielcik, J; Bielcikova, J; Bland, LC; Bombara, M; Bordyuzhin, IG; Borowski, W; Bouchet, J; Braidot, E; Brandin, AV; Brovko, SG; Bruna, E; Bueltmann, S; Bunzarov, I; Burton, TP; Cai, XZ; Caines, H; Calderón DeLa Barca Sánchez, M; Cebra, D; Cendejas, R; Cervantes, MC; Chaloupka, P; Chattopadhyay, S; Chen, HF; Chen, JH; Chen, JY; Chen, L; Cheng, J; Cherney, M; Chikanian, A; Christie, W; Chung, P; Codrington, MJM; Corliss, R; Cramer, JG; Crawford, HJ; Cui, X; Davila Leyva, A; De Silva, LC; Debbe, RR; Dedovich, TG; Deng, J; Derevschikov, AA; Derradi De Souza, R; Dhamija, S; Didenko, L; Djawotho, P; Dong, X; Drachenberg, JL; Draper, JE; Du, CM; Dunkelberger, LE; Dunlop, JC; Efimov, LG; Elnimr, M; Engelage, J; Eppley, G; Eun, L; Evdokimov, O; Fatemi, R; Fedorisin, J; Fersch, RG; Filip, P; Finch, E; Fisyak, Y; Gagliardi, CA; Gaillard, L; Gangadharan, DR; Geurts, F; Ghosh, P; Gliske, S; Gorbunov, YN; Grebenyuk, OG; Grosnick, D; Gupta, A; Gupta, S; Guryn, W; Haag, B; Hajkova, O; Hamed, A; Han, LX; Harris, JW
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