Production of prompt and nonprompt ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ mesons in jets in pp collisions at $\sqrt{s} = 5.02~\mathrm{TeV}$

The fragmentation of jets containing a ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ meson is studied in low pile-up pp data recorded in 2015, at a center-of-mass energy of $\sqrt{s} = 5.02~\mathrm{TeV}$. The fraction of the jet transverse momentum $p_{\rm T,jet}$ taken by the ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ is measured for both prompt and nonprompt ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ mesons. The value of $p_{\rm T,jet}$ is restricted to the range of 25 -- 35 GeV. The ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ mesons are measured above 3 and 6.5 GeV, in the endcap and barrel regions of the CMS detector, respectively. Whereas the results for nonprompt ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ are well-modeled by simulations using a Monte Carlo generator, the prompt ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ are found to be accompanied by a larger level of jet activity. The fraction of ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$ mesons that are found to be inside a jet within the $p_{\rm T,jet}$ selection is also reported, and found to be larger than simulation, for both prompt and nonprompt ${\rm J}\hspace{-.08em}/\hspace{-.14em}\psi$.