Mass, quark-number, and $\sqrt{s_{NN}}$ dependence of the second and fourth flow harmonics in ultra-relativistic nucleus-nucleus collisions

Abelev, B.I.; Aggarwal, M.M.; Ahammed, Z.; Anderson, B.D.; Arkhipkin, D.; Averichev, G.S.; Bai, Y.; Balewski, J.; Barannikova, O.; Barnby, L.S.

doi:10.1103/PhysRevC.75.054906

Mass, quark-number, and $\sqrt{s_{NN}}$ dependence of the second and fourth flow harmonics in ultra-relativistic nucleus-nucleus collisions

STAR

Collaboration

Jan, 2007

12 pages

Published in:

Phys.Rev.C 75 (2007) 054906

e-Print:

nucl-ex/0701010 [nucl-ex]

DOI:

10.1103/PhysRevC.75.054906

Experiments:

BNL-RHIC-STAR

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Abstract:

We present STAR measurements of the azimuthal anisotropy parameter

v_2

for pions, kaons, protons,

\Lambda

,

\bar{\Lambda}

,

\Xi+\bar{\Xi}

, and

\Omega + \bar{\Omega}

, along with

v_4

for pions, kaons, protons, and

\Lambda + \bar{\Lambda}

at mid-rapidity for Au+Au collisions at

\sqrt{s_{_{NN}}}=62.4

and 200 GeV. The

v_2(p_T)

values for all hadron species at 62.4 GeV are similar to those observed in 130 and 200 GeV collisions. For observed kinematic ranges,

v_2

values at 62.4, 130, and 200 GeV are as little as 10%--15% larger than those in Pb+Pb collisions at

\sqrt{s_{_{NN}}}=17.3

GeV. At intermediate transverse momentum (

p_T

from 1.5--5 GeV/c), the 62.4 GeV

v_2(p_T)

and

v_4(p_T)

values are consistent with the quark-number scaling first observed at 200 GeV. A four-particle cumulant analysis is used to assess the non-flow contributions to pions and protons and some indications are found for a smaller non-flow contribution to protons than pions. Baryon

v_2

is larger than anti-baryon

v_2

at 62.4 and 200 GeV perhaps indicating either that the initial spatial net-baryon distribution is anisotropic, that the mechanism leading to transport of baryon number from beam- to mid-rapidity enhances

v_2

, or that anti-baryon and baryon annihilation is larger in the in-plane direction.

Note:

12 pages, 8 figures, submitted for publication in Phys. Rev. C

25.75.Nq
25.75.Ld
scattering: heavy ion
gold
hadron: multiple production
pi
K
p
Lambda
Xi

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