The nuclear modification factor, \RAA, as a function of \pt for \phim mesons in different centrality classes in \PbPb collisions at \snn $=$ 5.02 \TeV compared with the results in \PbPb collisions at \snn $=$ 2.76 \TeV . The statistical and systematic uncertainties are shown as bars and boxes, respectively. The boxes around unity indicate the uncertainty on the normalization of \RAA.