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.