Measurements of momentum correlation and interaction parameters between antiprotons  

作　　者：Zheng-Qiao Zhang Yu-Gang Ma 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy ofSciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nuclear Science and Techniques》2016年第6期67-73,共7页核技术（英文）

基　　金：supported in part by the National Natural Science Foundation of China(No.11421505);the Major State Basic Research Development Program in China(No.2014CB845401)

摘　　要：The two-particle momentum correlation is influenced by the nuclear force between two particles,which has been intensively studied for nucleons and nuclei,but not much for antinucleons or antinuclei.In this proceeding,we present our STAR measurements on momentum correlation function of antiproton-antiproton and proton-proton in Au+Au collisions at S_(NN)^(1/2)= 200 GeV at the Relativistic Heavy Ion Collider.Attractive nuclear force between two antiprotons is demonstrated,and the strong interaction parameters(the scattering length and the effective range) are determined.This measurement serves as an additional verification of CPT symmetry.The present information on the strong force in the antiproton-antiproton system provides a fundamental ingredient towards understanding the structure of more sophisticated antinuclei.The two-particle momentum correlation is influenced by the nuclear force between two particles,which has been intensively studied for nucleons and nuclei,but not much for antinucleons or antinuclei.In this proceeding,we present our STAR measurements on momentum correlation function of antiproton-antiproton and proton-proton in Au＋Au collisions at SNN1/2= 200 GeV at the Relativistic Heavy Ion Collider.Attractive nuclear force between two antiprotons is demonstrated,and the strong interaction parameters（the scattering length and the effective range） are determined.This measurement serves as an additional verification of CPT symmetry.The present information on the strong force in the antiproton-antiproton system provides a fundamental ingredient towards understanding the structure of more sophisticated antinuclei.

关 键 词：动量相关作用 相互作用参数 反质子 测量 重离子对撞机 散射长度 核力量 金+金 

分 类 号：O571[理学—粒子物理与原子核物理]