Measurements of mass-dependent azimuthal anisotropy in central p+Au, d+Au, and 3He+Au collisions at root(s)NN=200 GeV

Adare, A. and Makek, Mihael and Vukman, Nikola and Zou, L. (PHENIX Collaboration) (2018) Measurements of mass-dependent azimuthal anisotropy in central p+Au, d+Au, and 3He+Au collisions at root(s)NN=200 GeV. Physical Review C, 97 (6). pp. 64904-11. ISSN 2469-9985

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Abstract

We present measurements of the transverse- momentum dependence of elliptic flow v2 for identified pions and (anti)protons at midrapidity (|η|<0.35), in 0%–5% central p+Au and He3+Au collisions at sNN=200 GeV. When taken together with previously published measurements in d+Au collisions at sNN=200 GeV, the results cover a broad range of small-collision-system multiplicities and intrinsic initial geometries. We observe a clear mass-dependent splitting of v2(pT) in d+Au and He3+Au collisions, just as in large nucleus-nucleus (A+A) collisions, and a smaller splitting in p+Au collisions. Both hydrodynamic and transport model calculations successfully describe the data at low pT (<1.5GeV/c), but fail to describe various features at higher pT. In all systems, the v2 values follow an approximate quark-number scaling as a function of the hadron transverse kinetic energy per constituent quark (KET/nq), which was also seen previously in A+A collisions.

Item Type: Article
Keywords: azimuthal anisotropy ; small systems ; 200 GeV ; PHENIX ; RHIC
Date: 11 June 2018
Number of Pages: 11
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2018 American Physical Society. Received 27 October 2017; published 11 June 2018.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 16 Jul 2018 08:59
Last Modified: 16 Jul 2018 08:59
URI: http://digre.pmf.unizg.hr/id/eprint/5831

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