Effects of bulk viscosity on hadron spectra and the Hanbury-Brown Twiss radius by causal viscous hydrodynamics  

作　　者：李建伟 马余刚 马国亮 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences [2]Graduate School of the Chinese Academy of Sciences

出　　处：《Chinese Physics B》2009年第11期4786-4790,共5页中国物理B（英文版）

基　　金：Project supported in part by the National Natural Science Foundation of China (Grant Nos 10610285, 10775167 and 10705044);the Knowledge Innovation Project of Chinese Academy of Sciences (Grant Nos KJCX2-YW-A14 and KJCX3-SYW-N2);the Startup Foundation for the CAS Presidential Scholarship Award of China (Grant No 29010702)

摘　　要：The particle spectra and Hanbury-Brown Twiss （HBT） radius of Au＋Au collisions at RHIC energy are investigated by a hydrodynamical expanding source with both shear and bulk viscosities （ζ）. With a large width of the ratio of ζ to entropy density s, both the particle transverse momentum spectra and the ratio Rout/Raide Of HBT radii in the direction of the total transverse momentum of detected two particles （Rout） and perpendicular to both this direction and the beam direction （Rside） become a little steeper.The particle spectra and Hanbury-Brown Twiss （HBT） radius of Au＋Au collisions at RHIC energy are investigated by a hydrodynamical expanding source with both shear and bulk viscosities （ζ）. With a large width of the ratio of ζ to entropy density s, both the particle transverse momentum spectra and the ratio Rout/Raide Of HBT radii in the direction of the total transverse momentum of detected two particles （Rout） and perpendicular to both this direction and the beam direction （Rside） become a little steeper.

关 键 词：relativistic hydrodynamics bulk viscosity hadron spectra HBT radius 

分 类 号：O571.4[理学—粒子物理与原子核物理]