Charm-strange meson production in ultrarelativistic heavy-ion collisions at energies available at the CERN Large Hadron Collider

摘要

The nuclear modification factor R-AA and the elliptic flow coefficient v(2) of charm-strange meson D-s(+) is systematically studied in Pb-Pb collisions at root s(NN) = 5.02 and 2.76 TeV. During the modeling, the coupling strength between the injected charm quark and the incident medium constituents is extracted from the lattice QCD calculations: 2 pi T D-s = const (Model-A) and 2 pi T D-s = 1.3 + (T/T-c)(2) (Model-B). We find that, comparing R-AA (D-s+) with R-AA (nonstrange), the heavy-light coalescence effect is more pronounced for the former one, resulting in an enhancement behavior in the range 2 less than or similar to p(T) less than or similar to 5 GeV. The predictions for R-AA (D-s(+)) and R-AA (nonstrange) favor Model-A to have a better description of the measured pT dependence at both energies, while the predictions for v(2) prefer Model-B at moderate p(T) (2 less than or similar to p(T) less than or similar to 4 GeV). Therefore, it is necessary to consider the temperature and/or momentum dependence of 2 pi T D-s to describe simultaneously R-AA (D-s(+)) and v(2) (D-s(+)) in different centrality classes in Pb-Pb collisions.