Abstract
The azimuthal anisotropy of particle distributions is one of the important observables that characterize collective effects at the initial stage of the formation and expansion of quark-gluon matter in collisions of relativistic nuclei. It is expected that an increase in energy from RHIC to LHC values will be accompanied by the growth of the azimuthal-anisotropy coefficient υ 2 and the growth of nonflow effects (contribution of minijets and other correlations between particles). In the present study, methods for determining the azimuthal-anisotropy coefficient υ 2 are analyzed on the basis of events simulated with the aid of the HYDJET generator for Pb + Pb collisions at the LHC energies, the contribution of nonflow effects being estimated. The accuracy of measuring the coefficient υ 2 as a function the transverse momentum and pseudorapidity under experimental conditions at LHC is assessed.
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