Electromagnetic field produced in high-energy small collision systems within charge density models of nucleons  

作　　者：Zong-Wei Zhang Xian-Zhuo Cen Wei-Tian Deng 张宗炜;岑显焯;邓维天(School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China;Dalingshan Secondary School,DongGuan 523000,China)

机构地区：[1]School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]Dalingshan Secondary School,DongGuan 523000,China

出　　处：《Chinese Physics C》2022年第8期184-195,共12页中国物理C（英文版）

基　　金：Supported by the NSFC (12075094,11535005)。

摘　　要：Recent experiments show that Δy,an observable designed to detect the chiral magnetic effect(CME),in small collision systems(p+A) is similar to that in heavy ion collisions(A+A).This introduces a challenge to the existence of the CME because it is believed that no azimuthal correlation exists between the orientation of the magnetic field(Φ_(B)) and participant plane(Φ_(2)) in small collision systems.In this work,we introduce three charge density models to describe the inner charge distributions of protons and neutrons and calculate the electric and magnetic fields produced in small p+A collisions at both RHIC and LHC energies.Our results show that the contribution of the single projectile proton is the main contributor to the magnetic field after averaging over all participants.The azimuthal correlation between Φ_(B) and Φ_(2) is small but not vanished.Additionally,owing to the large fluctuation in field strength,the magnetic-field contribution to Δγ may be large.

关 键 词：electromagnetic field high energy small collision system chiral magnetic effect 

分 类 号：O572[理学—粒子物理与原子核物理]