Energy and system-size dependence of two- and four-particle nu(2) measurements in heavy-ion collisions at root S-NN=62.4 and 200 GeV and their implications on flow fluctuations and nonflow

0385115 - ÚJF 2013 RIV US eng J - Journal Article
Agakishiev, G. - Aggarwal, M. M. - Ahammed, Z. - Alakhverdyants, A. V. - Alekseev, I. - Alford, J. - Anderson, B. D. - Anson, C. - Bielčík, J. - Bielčíková, Jana - Chaloupka, Petr - Chung, Paul - Hajková, O. - Kapitán, Jan - Kushpil, Vasilij - Krus, M. - Pachr, M. - Rusňák, Jan - Šumbera, Michal - Tlustý, David … Total 366 authors
Energy and system-size dependence of two- and four-particle nu(2) measurements in heavy-ion collisions at root S-NN=62.4 and 200 GeV and their implications on flow fluctuations and nonflow.
Physical Review. C. Roč. 86, č. 1 (2012), s. 014904. ISSN 0556-2813
R&D Projects: GA MŠMT LA08015
Institutional support: RVO:61389005
Keywords : heavy ion collision * particle production * flow measurement
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.715, year: 2012

We present STAR measurements of azimuthal anisotropy by means of the two- and four-particle cumulants nu(2) (nu(2){2} and nu(2){4}) for Au + Au and Cu + Cu collisions at center-of-mass energies root S-NN = 62.4 and 200 GeV. The difference between nu(2){2}(2) and nu(2){4}(2) is related to nu(2) fluctuations (sigma(nu 2)) and nonflow (delta(2)). We present an upper limit to sigma(nu 2)/nu 2. Following the assumption that eccentricity fluctuations sigma(epsilon) dominate nu(2) fluctuations nu(2)/sigma nu(2) approximate to epsilon/sigma epsilon we deduce the nonflow implied for several models of eccentricity fluctuations that would be required for consistency with nu(2){2} and nu(2){4}. We also present results on the ratio of nu(2) to eccentricity.
Permanent Link: http://hdl.handle.net/11104/0216922