Analyses of multi-pion Bose-Einstein correlations for granular sources with coherent pion-emission droplets  

作　　者：Ghulam Bary Wei-Ning Zhang Peng Ru Jing Yang Ghulam Bary;张卫宁;茹芃;杨婧(School of Physics,Dalian University of Technology,Dalian 116024,China;School of Physics,Harbin Institute of Technology,Harbin 150006,China;Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China;School of Physics,Changchun Normal University,Changchun 130032,China)

机构地区：[1]School of Physics,Dalian University of Technology,Dalian 116024,China [2]School of Physics,Harbin Institute of Technology,Harbin 150006,China [3]Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China [4]School of Physics,Changchun Normal University,Changchun 130032,China

出　　处：《Chinese Physics C》2021年第2期467-478,共12页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(11675034,11275037)。

摘　　要：The ALICE Collaboration measured three-and four-pion Bose-Einstein correlations(BECs)for Pb-Pb collisions at the Large Hadron Collider(LHC).It is speculated that the observed significant suppression of multi-pion BECs is owing to a considerable degree of coherent pion emission in these collisions.Here,we study multi-pion BEC functions for granular sources with coherent pion-emission droplets.We find that the intercepts of the multi-pion correlation functions at the relative momenta near zero are sensitive to the number of droplets in the granular source.They decrease with the droplet number.The three-pion correlation functions for evolving granular sources with momentum-dependent partially coherent pion-emission droplets basically agree with the experimental data for Pb-Pb collisions at √SNN=2.76 TeV at the LHC.However,the model results for the four-pion correlation function are inconsistent with the experimental data.Investigations into normalized multi-pion correlation functions of granular sources suggest an interesting enhancement of the normalized four-pion correlation function in the moderate relative-momentum region.

关 键 词：pion interferometry multi-pion correlations viscous granular sources partially coherent emission relativistic heavy-ion collisions 

分 类 号：O572.33[理学—粒子物理与原子核物理]