$B^0_s$ and $B^+$ nuclear modification factors in PbPb collisions at at $\sqrt S_{NN}$ = 5.02 TeV with the CMS detector

Beauty quark production in heavy-ion collisions is considered to be one of the key measurements to address the flavour-dependence of in-medium energy loss in heavy-ion collisions.On the other hand, the measurement of the production of strange beauty mesons can provide fundamental insights into the relevance of mechanisms of beauty recombination in the quark-gluon plasma.In this talk, CMS results on the nuclear modification factor, R AA , of fully reconstructed B 0 s and B + mesons as a function of transverse momentum at √ s NN = 5.02 TeV in PbPb collisions will be presented for the first time.The R AA double ratio between B 0 s and B + will also be presented.