Transverse momentum dependence of differential directed flow of Λ hyperon within kaon covariant dynamics  

作　　者：SRISAWAD Pornrad 

机构地区：[1]Department of Physics,Faculty of Science,Naresuan University Amphoe Mueany

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第2期331-335,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported in part by the National Natural Science Foundation of China (Grant Nos. 10575075, 10447006, 10435080, 10611140542and 10811240295);the Commission on Higher Education of Thailand(CHE-RES-RG Theoretical Physics)

摘　　要：The transverse momentum distributions of Λ's and proton's directed flows are investigated by using Quantum Molecular Dynamics model (QMD) within the framework of covariant kaon dynamics. The calculated results show that the transverse momentum distribution of differential directed flow of Lambda hyperons is dependent appreciably on the nuclear matter equation of states (EOS). The differential directed flow of Lambda hyperons calculated with soft EOS is consistent with the experimental data,whereas the discrepancy between the results obtained with hard EOS and experimental data increases with increasing the transverse momentum. Although the interaction acting on Λ's by nucleons in the dense medium is attractive,the analysis indicates,that the transverse momentum distribution of proton's directed flow is insensitive to the EOS. The results obtained with both hard and soft EOS are all roughly in agreement with the corresponding data.The transverse momentum distributions of Λ’s and proton’s directed flows are investigated by using Quantum Molecular Dynamics model (QMD) within the framework of covariant kaon dynamics. The calculated results show that the transverse momentum distribution of differential directed flow of Lambda hyperons is dependent appreciably on the nuclear matter equation of states (EOS). The differential directed flow of Lambda hyperons calculated with soft EOS is consistent with the experimental data,whereas the discrepancy between the results obtained with hard EOS and experimental data increases with increasing the transverse momentum. Although the interaction acting on Λ’s by nucleons in the dense medium is attractive,the analysis indicates,that the transverse momentum distribution of proton’s directed flow is insensitive to the EOS. The results obtained with both hard and soft EOS are all roughly in agreement with the corresponding data.

关 键 词：lambda HYPERON DIFFERENTIAL directed flow KAON MESON COVARIANT DYNAMICS 

分 类 号：O571[理学—粒子物理与原子核物理]