Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions -: art. no. 054907

被引：161

作者：

Bratkovskaya, EL ^{[1
]}

Bleicher, M

Reiter, M

Soff, S

Stöcker, H

van Leeuwen, M

Bass, SA

Cassing, W

机构：

[1] Goethe Univ Frankfurt, Inst Theoret Phys, D-60054 Frankfurt, Germany

[2] NIKHEF, Amsterdam, Netherlands

[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[4] Duke Univ, Dept Phys, Durham, NC 27708 USA

[5] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA

[6] Univ Giessen, Inst Theoret Phys, D-35392 Giessen, Germany

来源：

PHYSICAL REVIEW C | 2004年 / 69卷 / 05期

关键词：

D O I：

10.1103/PhysRevC.69.054907

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We investigate hadron production as well as transverse hadron spectra from proton-proton, proton-nucleus, and nucleus-nucleus collisions from 2A GeV to 213A TeV within two independent transport approaches, i.e., hadron-string dynamics (HSD) and ultrarelativistic quantum molecular dynamics (UrQMD) that are based on quark, diquark, string, and hadronic degrees of freedom. The comparison to experimental data on transverse mass spectra from pp, pA, and C + C (or Si + Si) reactions shows the reliability of the transport models for light systems. For central Au+Au (Pb+Pb) collisions at bombarding energies above similar to5A GeV, furthermore, the measured K+/- transverse mass spectra have a larger inverse slope parameter than expected from the default calculations. We investigate various scenarios to explore their potential effects on the K+/- spectra. In particular the initial state Cronin effect is found to play a substantial role at top Super Proton Synchrotron (SPS) and Relativistic Heavy Ion Collider (RHIC) energies. However, the maximum in the K+/-/pi(+) ratio at 20-30 A GeV is missed by 40% and the approximately constant slope of the K+/- spectra at SPS energies is not reproduced either. Our systematic analysis suggests that the additional pressure-as expected from lattice QCD calculations at finite quark chemical potential mu(q) and temperature T-should be generated by strong interactions in the early prehadronic/partonic phase of central Au+Au (Pb+Pb) collisions.

引用

页码：054907 / 1

页数：19

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