作者机构：
[Zhou, DC; Yang, CB; Cai, X; Yang, HY] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Yang, HY] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
高能核-核碰撞;强相互作用;通量中心相依性
摘要：
Directed flow and elliptic flow of final state particles in high-energy nucleus-nucleus collisions in the EMU01 experiment have been studied. The dependences of directed flow and elliptic flow on incident energy and impact centrality of outgoing particles are presented. The results exhibit strong dependence of flow on centrality and energy. We also suggest a more reliable way to determine the event plane resolution here.
作者机构：
[周代翠; 冯又层] Institute of Particle Physics, Central China Normal Unviersity;[许晓明] Nuclear Physics Division, Shanghai Institute of Nuclear Research, Chinese Academy of Sciences
作者机构：
[Feng, YC] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Acad Sinica, Shanghai Inst Nucl Res, Shanghai 201800, Peoples R China.
通讯机构：
[Feng, YC] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
量子色动力学;核子χcJ;分解载面
摘要：
Nucleon-χcJ dissociation cross sections are calculated in a constituent interexchange model in which quark-quark potential is derived from the Buchmüller-Tye quark-anti-quark potential. These new cross sections for dominant reaction channels depend on the centre-of-mass energy of the nucleon and the charmonium.
通讯机构：
[Yang, HY] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
High-energy nucleus-nucleus collision;Factorial moment;Cumulant moment;Oscillation of moments
摘要：
The definitions of density function and moment of multiplicity distribution are introduced, and the method of moment analysis in e+e- and proton-proton (pp) interactions is extended into nucleus-nucleus (AA) interactions. We analyze the data for relativistic nucleus-nucleus collisions and calculate the values of Hq for charged particle multiplicity distributions, by which we study systematically the dependences of Hqon incident energy, mass of colliding system, pseudorapidity interval, centrality and truncation of multiplicity. We compare the oscillation structures induced by e+ e-, pp and AA interactions, and the comparison and analysis are carried out between experimental data and QCD prediction. The latest results are given in this paper.
作者机构：
[Zhou, DC; Wu, T] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, T] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
Multiplicity distributions of negative binomial distribution (NBD) and modified NBD are obtained from it birth process model with an immigration. The ratio of factorial cumulant moment to factorial moment, i.e., H moment is calculated from different multiplicity distributions of NBD, modified NBD and the three fireball model, which shows an oscillatory behavior when there is a truncation of multiplicity. The oscillation of H moment is related to the common character of the truncated multiplicity distributions.
期刊：
SCIENCE IN CHINA SERIES A-MATHEMATICS,2000年43(6):623-628 ISSN：1006-9283
通讯作者：
Wang, XR
作者机构：
[Wang, XR] Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;CCAST, World Lab, Beijing 100080, Peoples R China.;China Inst Atom Energy, Beijing 102413, Peoples R China.;Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.;CERN, Div PPE, CH-1211 Geneva 23, Switzerland.
通讯机构：
[Wang, XR] H;Hua Zhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
relativistic heavy-ion collision;strangeness production;LUCIAE model
摘要：
LUCIAE, a hadronic and string cascade model and its corresponding event generator are used to analyse strangeness production singly and multiply in p-Pb and Pb-Pb collisions at 158 A GeV. Spectra of multiplicity and transverse mass for single
$$(\Lambda ,\overline \Lambda )$$
and multiple
$$(\Xi ^ - ,\overline {\Xi ^ - } ,\Omega ^ - ,\overline {\Omega ^ - } )$$
strangeness are given. In LUCIAE model it suggests a physical mechanism, i.e. the dependence of the strange quark suppression factor on incident energy, projectile mass and centrality of colliding system might result in increase of yield of strange particles with increasing the above three parameters. Calculations from the model reconstruct well the WA97 experimental data: increase of yield of strange particles with increasing centrality and increase of strangeness enhancement with increasing number of strange quarks, in relativistic nucleus-nucleus collisions.
作者机构：
[Zhou, DC] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Univ Paris Sud, Inst Phys Nucl, F-91406 Orsay, France.
通讯机构：
[Zhou, DC] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
重离子碰撞;重夸克衰变;μ介子;双μ介子
摘要：
The production of heavy-flavor quark c(c̄) and b(b̄) in pp collisions is described under perturbative quantum chromodynamics framework, the extrapolation from hadron-hadron up to nucleus-nucleus collisions is based on geometrical model by taking into account the nucleus shadowing effect. We simulate the heavy quark production, the decay to dilepton and effects of detection and analysis technique of the pairs, and predict the muon rate and the invariant mass spectrum of dimuons that could be detected in forward region in Pb-Pb collisions at large hadron collider energies.
