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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents

ID: 543849.0, MPI für Physik / MPI für Physik
Mass, quark-number, and $\sqrt{s_{NN}}$ dependence of the second and fourth flow harmonics in ultra-relativistic nucleus-nucleus collisions
Authors:STAR Collaboration; Abelev, B.; Eckardt, V.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:75
Start Page:054906
Audience:Not Specified
Intended Educational Use:No
Abstract / Description: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.
Classification / Thesaurus:STAR
Comment of the Author/Creator:12 pages, 8 figures, submitted for publication in Phys. Rev. C
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
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