Non-extensive statistical distributions of charmed meson production in Pb-Pb and pp(p)collisions  

作　　者：Yuan Su Yong-Jie Sun Yi-Fei Zhang Xiao-Long Chen 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China [2]Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Nuclear Science and Techniques》2021年第10期79-87,共9页核技术（英文）

基　　金：This is supported by the National Key Research and Development Program of China(Nos.2018YFE0205200 and 2018YFE0104700);National Natural Science Foundation of China(Nos.11890712 and 12061141008);Strategic Priority Research Program of CAS(No.XDB34030000);Anhui Provincial Natural Science Foundation(No.1808085J02).

摘　　要：The mid-rapidity transverse momentum spectra of charmed mesons in Pb–Pb and pp(p)collisions are analyzed using the Tsallis–Pareto distribution derived from non-extensive statistics.We provide uniform descriptions of both small and large systems over a wide range of collision energies and hadron transverse momenta.By establishing the relationship between the event multiplicity and Tsallis parameters,we observe that there is a signifi-cant linear relationship between the thermal temperature and Tsallis q parameter in Pb–Pb collisions at √sNN=2.76 TeV and 5.02 TeV.Further,the slope of the T–(q-1)parameter plot is positively correlated with the hadron mass.In addition,charmed mesons have a higher thermal temperature than light hadrons at the same q-1,indicat-ing that the charm flavor requires a higher temperature to reach the same degree of non-extensivity as light flavors in heavy-ion collisions.The same fit is applied to the trans-verse momentum spectra of charmed mesons in pp(p)collisions over a large energy range using the Tsallis–Pareto distribution.It is found that the thermal temperature increases with system energy,whereas the q parameter becomes saturated at the pp(p)limit,q-1=0.142±0.010.In addition,the results of most peripheral Pb–Pb collisions are found to approach the pp(p)limit,which suggests that more peripheral heavy-ion collisions are less affected by the medium and more similar to pp(p)collisions.

关 键 词：Charmed meson Non-extensive statistics Tsallis-Pareto distribution QGP Heavy-ion collision 

分 类 号：O572.33[理学—粒子物理与原子核物理]