Measurement of prompt and nonprompt charmonium suppression in collisions at 5.02

The nuclear modification factors of and mesons are measured in collisions at a centre-of-mass energy per nucleon pair of . The analysis is based on and data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 and 28, respectively. The measurements are performed in the dimuon rapidity range of as a function of centrality, rapidity, and transverse momentum ( ) from in the most forward region and up to 50. Both prompt and nonprompt (coming from b hadron decays) mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at for the two meson components. No dependence on rapidity is observed for either prompt or nonprompt mesons. An indication of a lower prompt meson suppression at is seen with respect to that observed at intermediate . The prompt meson yield is found to be more suppressed than that of the prompt mesons in the entire range.