作者机构：
[Cheng, Y] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
通讯机构：
[Cheng, Y] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
Using the relativistic quantum molecular dynamics model, transverse momentum distributions and particle ratios are studied for 197Au+197Au collisions at sNN=200GeV. In particular, we present results on the mean transverse momentum of charged pions, charged kaons, protons, and antiprotons and compare with experimental measurements. We discuss an approach to study early partonic collectivity in high energy nuclear collisions.
作者机构：
[周代梅; 王晓荣; 蔡勖] 华中师范大学粒子物理研究所;[萨本豪] 中国原子能科学研究院;[台安] Department of Physics and Astronomy, University of California;[许怒] Lawrence Berkeley National Laboratory
期刊：
SCIENCE IN CHINA SERIES A-MATHEMATICS,2002年45(12):1582-1587 ISSN：1006-9283
通讯作者：
Wang, XR
作者机构：
[Wang, XR] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Inst Atom Energy, Beijing 102413, Peoples R China.;Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.;Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.;Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30303 USA.
通讯机构：
[Wang, XR] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
p-p and Pb-Pb collisions;transverse-mass distribution;φ meson production;LUCIAE model
摘要：
The φ meson yield, rapidity and transverse mass distributions in p-p and Pb-Pb collisions at 158 A GeV were studied by the hadron-string cascade model, LUCIAE. By adjusting the width parameter in q-q Gaussian like transverse momentum distribution in string fragmentation to fit the NA49 data ofφ meson transverse mass distribution in p-p collisions, the obtained φ meson rapidity distribution in p-p collisions, the rapidity and transverse mass distributions in Pb-Pb collisions, and theφ meson enhancement factor in Pb-Pb relative to p-p collisions were compatible with corresponding NA49 data, which might be attributed to the collective effect in gluon emission of string and the reduction of strange quark suppression mechanisms involved in the LUCIAE model.
作者机构：
China Inst Atom Energy, Beijing 102413, Peoples R China.;Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany.;Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.;Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.;Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China.
通讯机构：
[Sa, BH] C;China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China.
摘要：
Using a hadron-string cascade model LUCIAE, the phi -meson production in nuclear collisions (p + Pb and Pb + Pb) and elementary collisions p + p were studied systematically. Within the framework of the model, the experimentally measured phi enhancement in p + Ph and Pb + Pb over p + p collisions can be mostly explained by the collective effects in the gluon string emission and the reduction of the s-quark suppression. (C) 2001 Published by Elsevier Science B.V.
