Measurement of prompt $\rm{ D_{s}^{+}}$ production in pp and PbPb collisions at $\sqrt{s_{_{\text{NN}}}}$ = 5.02 TeV

The transverse momentum ($p_{T}$) spectra of prompt $\rm{ D_{s}^{+}}$ mesons and charge conjugates are measured in pp and PbPb collisions at a center-of-mass energy of 5.02 TeV per nucleon pair using the CMS detector at the LHC. The measurement is performed through the ${\rm D_{s}^{+}}$ $\to$ $\phi$$\pi^{+}$ $\to$ $\rm{K^{+}K^{-}}$$\pi^{+}$ decay channels with the $\rm{ D_{s}^{+}}$ rapidity range $|y| < 1.0 $. The $\rm{ D_{s}^{+}}$ production in the $p_{T}$ range from 2 (6) ${\rm GeV/c}$ to 40 ${\rm GeV/c}$ in pp (PbPb) collisions is measured. Suppression of the $\rm{ D_{s}^{+}}$ nuclear modification factor ($\rm{R_{AA}}$) in PbPb collisions suggests a strong interaction between charm quarks and the quark-gluon plasma. The double ratio of prompt $\rm{ D_{s}^{+}}$ to prompt ${\rm D^{0}}$ production in pp and PbPb is consistent with a PHSD model calculation and consistent with unity, which indicates that strange charm meson enhancement in PbPb collisions is not significant in the measured $\rm{ D_{s}^{+}}$ $p_{T}$ interval.