Measurements of momentum correlation and interaction parameters between antiprotons

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-ant...

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Bibliographic Details
Published in:Nuclear science and techniques 2016-12, Vol.27 (6), p.67-73, Article 152
Main Authors: Zhang, Zheng-Qiao, Ma, Yu-Gang
Format: Article
Language:English
Subjects:
Energy
Hadrons
Heavy Ions
Nuclear Energy
Nuclear Physics
动量相关作用
反质子
散射长度
核力量
测量
相互作用参数
重离子对撞机
金＋金
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Summary: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.
ISSN:1001-8042
2210-3147
DOI:10.1007/s41365-016-0147-x