Naslov
System-size independence of directed flow at the BNL Relativistic Heavy-Ion Collider

Autori
Abelev, B.I. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; et al. (the STAR Collaboration)

Izvornik
Physical Review Letters (0031-9007) 101 (2008), 25; 252301-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Au+Au and Cu+Cu collisions

Sažetak
We measure directed flow ($v_1$) for charged particles in Au+Au and Cu+Cu collisions at $\sqrt{; ; s_{; ; NN}; ; }; ; =$ 200 GeV 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 existing models, not on the size of the colliding system at a given centrality. We extend the validity of the limiting fragmentation concept to different collision systems, and investigate possible explanations for the observed sign change in $v_1(p_t)$

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Art. no. 252301.

POVEZANOST RADA