Modification of the spectra of correlated charm-anticharm quark pairs in the quark-gluon plasma  

作　　者：Ismat Ullah Min He Ismat Ullah;何敏(Department of Applied Physics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]Department of Applied Physics,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Chinese Physics C》2020年第5期56-62,共7页中国物理C（英文版）

基　　金：This work was supported by Chinese government scholarship(CSC)for foreigner graduate students and by NSFC(11675079)。

摘　　要：Heavy quarks play an important role in probing the properties of strongly interacting quark-gluon plasma(QGP)created in ultra-relativistic heavy-ion collisions.We study the interactions of single heavy(charm)quarks and correlated charm and anticharm(ccˉ)quark pairs with the medium constituents of QGP by performing fireball+Langevin simulations of the pertinent Brownian motion with elastic collisions.Besides studying the traditional observables,the nuclear modification factor and the elliptic flow of single heavy quarks in QGP for different thermal relaxation rates,we also study the broadening of the azimuthal correlations of charm and anticharm quark pairs in the QGP medium for different relaxation rates and transverse momenta classes.We quantified the smearing of ccˉpair azimuthal correlations with an increasing thermal relaxation rate:while the(nearly)back-to-back correlations among ccˉpairs are almost completely washed out at low transverse momentum(pT),these correlations at high pT largely survive the pair diffusion.This provides a novel observable for diagnosing the properties of QGP.

关 键 词：QUARK-GLUON plasma heavy QUARKS BROWNIAN motion LANGEVIN simulation 

分 类 号：O572.33[理学—粒子物理与原子核物理] O53[理学—物理]