Fragmentation of jets containing a ${\mathrm{J}/\psi}$ meson in PbPb and pp collisions at 5 TeV

Jets containing a ${\mathrm{J}/\psi}$ meson are studied in PbPb collisions at a center of mass energy of ${\sqrt{s_{_{\text{NN}}}}} = 5.02~\mathrm{TeV}$, using the CMS detector at the LHC. Jets are selected to be in the transverse momentum range of $30 < {p_{\mathrm{T}}} < 40~\mathrm{GeV}$. The yield of ${\mathrm{J}/\psi}$ in these jets is evaluated as function of the jet fragmentation function variable $z$, the ratio of the ${\mathrm{J}/\psi}\, {p_{\mathrm{T}}}$ to the jet ${p_{\mathrm{T}}}$. The nuclear modification factor is then derived by comparing the yield in PbPb to the corresponding expectation from pp data at the same collision energy. The suppression of the ${\mathrm{J}/\psi}$ yield shows a dependence on $z$, indicating that the interaction of the ${\mathrm{J}/\psi}$ with the quark-gluon plasma formed in heavy-ion collisions depends on the fragmentation pattern of the jet that gives rise to the ${\mathrm{J}/\psi}$ meson.