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Multi-Pion Correlations in Two-Pion Interferometry
Authors:ZHANG Wei-Ning  JIANG Yu-Zhen  WANG Shan  LIU Yi-Ming
Affiliation: Department of Physics,Harbin Institute of Technology Harbin 1500062 Department of Physics,Kent State University Kent Ohio 442423 Department of Physics,University of California Riverside Ca 92521
Abstract:The influence of multi-pion correlations on two-pion interferometry analysis in multi-pion events can be expressed as the ratio of a multi pion correlation factor for the sample of like-pion pairs to a residual correlation factor for the reference sample.Although these two correlation factors can be partially cancelled our in data analyses,the difference between these two factors in the low relative momentum region is so large that the distortion on the analysed results of two-pion interferometry from multi-pion interference becomes a serious problem when the pion source has a small radius and the pion multiplicity of event is high.The distributions of multi-pion correlation factor Cn-2(q) can sensitively reflect the multi-pion correlation effects in the events The analyses of multi-pion correlation factor for two Bevalac streamer chamber data samples of 2.1AGeV Ne+Pb and 1.8AGeV Ar+Pb collisions show that the multi-pion correlation effect in the former data sample is greater that in the latter.
Keywords:
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