Directed Flow of Identified Particles in Au plus Au Collisions at root S-NN=200 GeV at RHIC

0486434 - ÚJF 2018 RIV US eng J - Journal Article
Adamczyk, L. - Agakishiev, G. - Aggarwal, M. M. - Barnovská, Zuzana - Bielčík, J. - Bielčíková, Jana - Chaloupka, Petr - Chung, Paul - Hajková, O. - Kapitán, Jan - Pachr, M. - Rusňák, Jan - Šumbera, Michal - Tlustý, David … Total 356 authors
Directed Flow of Identified Particles in Au plus Au Collisions at root S-NN=200 GeV at RHIC.
Physical Review Letters. Roč. 108, č. 20 (2012), č. článku 202301. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LA09013
Institutional support: RVO:61389005
Keywords : STAR collaboration * RHIC * heavy ions collisions
OECD category: Nuclear physics
Impact factor: 7.943, year: 2012

STAR's measurements of directed flow (v(1)) around midrapidity for pi(+/-), K-+/-, K-S(0), p, and (p) over bar in Au + Au collisions at root s(NN) = 200 GeV are presented. A negative v(1) (y) slope is observed for most of produced particles (pi(+/-), K-+/-, K-S(0), p, and (p) over bar). In 5%-30% central collisions, a sizable difference is present between the v(1)(y) slope of protons and antiprotons, with the former being consistent with zero within errors. The v(1) excitation function is presented. Comparisons to model calculations (RQMD, UrQMD, AMPT, QGSM with parton recombination, and a hydrodynamics model with a tilted source) are made. For those models which have calculations of v(1) for both pions and protons, none of them can describe v(1()y) forpions and protons simultaneously. The hydrodynamics model with a tilted source as currently implemented cannot explain the centrality dependence of the difference between the v(1)(y) slopes of protons and antiprotons.
Permanent Link: http://hdl.handle.net/11104/0281247