Study on the effect of finite size of hardons on pion
YIN Hongjie
ZHANG Yong
Abstract：In heavy－ion collisions,because hadrons cannot occupy too close space －time points,they are different from point－like objects.If the distance between two bosons is too close ,they will be indistinguishable which are considered that have not experienced Bose －Einstein statistics,this property is defined as composite nature of hadrons.The influence of finite size of hardons on HBT correlation is related to the size of hadrons and source.We use ideal fluid dynamics to describe the horizontal expansion source of (2+1) dimensional zero bary－on density,and combine with Byorken′s assumption of the enhancement invariance of source longitudinal expan－sion,We analysis the effects of composite nature for different sizes of sources on pion according to HBT interfer －ometry.At the same time,the two－pion correlation function are fitted by Gaussian formula.The fitting results in－dicate that the effect of the composite nature on HBT radius and chaos parameters is very small ,the normalized parameter was significantly reduced by the composite nature in small source , and decreases as HBT radii decrea－ses.
Keywords：HBT interferometrycomposite natureheavy－ion collisions
Publication Date：2019-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 238-243 )