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物理学
Non-extensive statistical distributions of charmed meson production in Pb–Pb and pp(■) collisions
The mid-rapidity transverse momentum spectra of charmed mesons in Pb-Pb and pp(■) 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 significant linear relationship between the thermal temperature and Tsallis q parameter in Pb-Pb collisions at■=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 indicating 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 transverse momentum spectra of charmed mesons in pp(■)collisions over a large energy range using the TsallisPareto distribution.It is found that the thermal temperature increases with system energy,whereas the q parameter becomes saturated at the pp(■) limit,q-1=0.142±0.010.In addition,the results of most peripheral Pb-Pb collisions are found to approach the pp(■) limit,which suggests that more peripheral heavy-ion collisions are less affected by the medium and more similar to pp(■)collisions.
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Nuclear Science and Techniques
2021年10期
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