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Strange particle production in relativistic nucleus-nucleus collisions at RHIC and LHC energy regions

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Chinese Physics C 2014年第5期38卷 28-32页

作者：任小文冯笙琴袁显宝 College of Science China Three Gorges University Key Laboratory of Quark and Lepton Physics(Huazhong Normal University)Ministry of Education School of Physics and Technology Wuhan University

PACIAE, a parton and hadron cascade model, is utilized to systematically investigate strange particle production and strangeness enhancement in Au＋Au collisions and in Pb＋Pb collisions with the √SNN = 200 GeV at the RHIC and 2.76 TeV at the LHC, respectively. The experimental results at different centralities, using data from the STAR collaboration and the ALICE collaboration, are well described by the PACIAE model. This may represent the importance of the parton and hadron rescatterings, as well as the reduction mechanism for strange quark suppression, that are implemented in the PACIAE model.

关键词： strange particle rapidity densities at midrapidity transverse momentum distribution PACIAE model

Projectile fragment emission in the fragmentation of ^(56)Fe on C,Al and CH_2 targets at 471 A MeV

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Chinese Physics C 2014年第1期38卷 19-27页

作者：李彦晶张东海晏世伟王立春程锦霞李俊生 S.Kodaira N.Yasuda College of Nuclear Science and Technology Beijing Normal University Institute of Modern Physics Shanxi Normal University Beijing Radiation Center Fundamental Technology Center National Institute of Radiological Sciences 4-9-1 AnagawaInage-kuChiba 263-8555Japan

The emission angle and the transverse momentum distributions of projectile fragments produced in the fragmentation of 56Fe on CHs, C and A1 targets at 471 A MeV are measured. It is found that for the same target, the average value and width of the angular distribution decrease with an increase of the projectile fragment charge; for the same projectile fragment, the average value of the distribution increases and the width of the distribution decreases with increasing the target charge number. The transverse momentum distribution of a projectile fragment can be explained by a single Gaussian distribution and the averaged transverse momentum per nucleon decreases with the increase of the charge of projectile fragment. The cumulated squared transverse momentum distribution of a projectile fragment can be explained well by a single Rayleigh distribution. The temperature parameter of the emission source of the projectile fragment, calculated from the cumulated squared transverse momentum distribution, decreases with the increase of the size of the projectile fragment.

关键词： heavy ion projectile fragmentation transverse momentum distribution CR-39

Effects of inelastic (re)scattering processes s→gg and gg→s on strange hadron production in pp collisions at RHIC and LHC energies

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Chinese Physics C 2012年第7期36卷 616-621页

作者：龙海燕冯笙琴 Dept.of Physics College of ScienceChina Three Gorges University Key Laboratory of Quark and Lepton Physics(Huazhong Normal University) Ministry of Education School of Physics and Technology Wuhan University

The rapidity densities at mid-rapidity and the transverse momentum distributions for strange hadrons produced in pp collisions are analyzed using the modified PACIAE model by considering the effect of inelastic （re）scattering processes ss -→gg and gg→ss in parton （re）scattering. The calculated results of the transverse momentum spectra of the strangeness fitting with data measured by STAR and ALICE Collaborations can be improved, especially at large transverse momentum levels. This demonstrates that the effect of inelastic （re）scattering processes of ss→gg and gg→ss is not negligible at RHIC and LHC energy levels.

关键词： strange particle rapidity distribution transverse momentum distribution PACIAE model inelastic (re)scattering process