No abstract

At the LHC, the strong collective flow is observed in Pb+Pb collisions, as shown by the azimuthal correlations in the transverse-momentum distributions of the produced particles. We calculate flow components in a relativistic fluid dynamical model at constant time freeze out (FO) for massless equilibrated post FO pion gas. Our results indicate that at the LHC the v 1 flow is expected to peak at forward rapidities, at the same side and direction as the projectile residue. The effect of initial state center-of-mass rapidity fluctuations is taken into account. In order to better study the transverse-momentum flow dependence, we suggest a new "symmetrized" v S 1 function; and we also propose a new method to disentangle global v 1 flow from the contribution generated by the random fluctuations in the initial state. The result is sensitive to the global initial state, where different parameterizations exist.