System-size independence of directed flow measured at the BNL relativistic heavy-ion collider

System-size independence of directed flow measured at the BNL relativistic heavy-ion collider

We measure directed flow (v_{1}) for charged particles in Au+Au and Cu+Cu collisions at sqrt[s_{NN}]=200 and 62.4 GeV, as a function of pseudorapidity (eta), transverse momentum (p_{t}), and collision centrality, based on data from the STAR experiment. We find that the directed flow depends on the i...

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Veröffentlicht in:Physical review letters 2008-12, Vol.101 (25), p.252301-252301, Article 252301
Hauptverfasser: Abelev, B I, Aggarwal, M M, Ahammed, Z, Anderson, B D, Arkhipkin, D, Averichev, G S, Bai, Y, Balewski, J, Barannikova, O, Barnby, L S, Baudot, J, Baumgart, S, Beavis, D R, Bellwied, R, Benedosso, F, Betts, R R, Bhardwaj, S, Bhasin, A, Bhati, A K, Bichsel, H, Bielcik, J, Bielcikova, J, Biritz, B, Bland, L C, Bombara, M, Bonner, B E, Botje, M, Bouchet, J, Braidot, E, Brandin, A V, Bueltmann, S, Burton, T P, Bystersky, M, Cai, X Z, Caines, H, Calderón de la Barca Sánchez, M, Callner, J, Catu, O, Cebra, D, Cendejas, R, Cervantes, M C, Chajecki, Z, Chaloupka, P, Chattopadhyay, S, Chen, H F, Chen, J H, Chen, J Y, Cheng, J, Cherney, M, Chikanian, A, Choi, K E, Christie, W, Chung, S U, Clarke, R F, Codrington, M J M, Coffin, J P, Cormier, T M, Cosentino, M R, Cramer, J G, Crawford, H J, Das, D, Dash, S, Daugherity, M, de Moura, M M, Dedovich, T G, Dephillips, M, Derevschikov, A A, Derradi de Souza, R, Didenko, L, Dietel, T, Djawotho, P, Dogra, S M, Dong, X, Drachenberg, J L, Draper, J E, Du, F, Dunlop, J C, Dutta Mazumdar, M R, Edwards, W R, Efimov, L G, Elhalhuli, E, Elnimr, M, Emelianov, V, Engelage, J, Eppley, G, Erazmus, B, Estienne, M, Eun, L, Fachini, P, Fatemi, R, Fedorisin, J, Feng, A, Filip, P, Finch, E, Fine, V, Fisyak, Y, Gagliardi, C A, Gaillard, L, Gangadharan, D R, Ganti, M S
Format: Artikel
Sprache:eng
Schlagworte:
ATOM COLLISIONS
BNL
BROOKHAVEN RHIC
CHARGED PARTICLES
COLLIDING BEAMS
COPPER 63 BEAMS
COPPER 63 REACTIONS
COPPER 63 TARGET
GEV RANGE 10-100
GOLD 197 BEAMS
GOLD 197 REACTIONS
GOLD 197 TARGET
LIMITING FRAGMENTATION
NUCLEAR PHYSICS AND RADIATION PHYSICS
PARTICLE RAPIDITY
TRANSVERSE MOMENTUM
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Zusammenfassung:We measure directed flow (v_{1}) for charged particles in Au+Au and Cu+Cu collisions at sqrt[s_{NN}]=200 and 62.4 GeV, as a function of pseudorapidity (eta), transverse momentum (p_{t}), and collision centrality, based on data from the STAR experiment. We find that the directed flow depends on the incident energy but, contrary to all available model implementations, not on the size of the colliding system at a given centrality. We extend the validity of the limiting fragmentation concept to v_{1} in different collision systems, and investigate possible explanations for the observed sign change in v_{1}(p_{t}).
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.101.252301