  The relative modification of the prompt psi(2S) and J/psi yields from pp to
PbPb collisions, at the center of mass energy of 5.02 TeV per nucleon pair, is
presented. The analysis is based on pp and PbPb data samples collected by the
CMS experiment at the LHC in 2015, corresponding to integrated luminosities of
28.0 inverse picobarns and 464 inverse microbarns, respectively. The double
ratio of measured yields of prompt charmonia reconstructed through their decays
into muon pairs, (N[psi(2S)]/N[J/psi])[PbPb] / (N[psi(2S)]/N[J/psi])[pp], is
determined as a function of PbPb collision centrality and charmonium transverse
momentum pt, in two kinematic intervals: abs(y) < 1.6 covering 6.5 < pt < 30
GeV/c and 1.6 < abs(y) < 2.4 covering 3 < pt < 30 GeV/c. The
centrality-integrated double ratios are 0.36 +/- 0.08 (stat) +/-0.05 (syst) in
the first interval and 0.24 +/- 0.22 (stat) +/- 0.09 (syst) in the second. The
double ratio is lower than unity in all the measured bins, suggesting that the
psi(2S) yield is more suppressed than the J/psi yield in the explored phase
space.
