Azimuthal Anisotropy in U plus U and Au plus Au Collisions at RHIC

0454089 - ÚJF 2016 RIV US eng J - Journal Article
Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Tlustý, David - Trzeciak, B. A. - Vértési, Robert … Total 333 authors
Azimuthal Anisotropy in U plus U and Au plus Au Collisions at RHIC.
Physical Review Letters. Roč. 115, č. 22 (2015), s. 222301. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA ČR GA13-20841S
Institutional support: RVO:61389005
Keywords : STAR collaboration * heavy ion collisions * nuclear collisions
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 7.645, year: 2015

Collisions between prolate uranium nuclei are used to study how particle production and azimuthal anisotropies depend on initial geometry in heavy-ion collisions. We report the two- and four-particle cumulants, v(2){2} and v(2){4}, for charged hadrons from U + U collisions at root s(NN) = 193 GeV and Au + Au collisions at root s(NN) = 200 GeV. Nearly fully overlapping collisions are selected based on the energy deposited by spectators in zero degree calorimeters (ZDCs). Within this sample, the observed dependence of v(2){2} on multiplicity demonstrates that ZDC information combined with multiplicity can preferentially select different overlap configurations in U + U collisions. We also show that v(2) vs multiplicity can be better described by models, such as gluon saturation or quark participant models, that eliminate the dependence of the multiplicity on the number of binary nucleon-nucleon collisions.
Permanent Link: http://hdl.handle.net/11104/0254782