Recent LHCb measurements of the $J / ψ$ meson production in jets are analyzed using fragmentation jet function formalism. It is shown that disagreement with theoretical predictions for distribution over the fraction of $J / ψ$ transverse momentum $z (J / ψ)$ in the cases of prompt production can be explained if one takes into account evolution of the fragmentation function and contributions from double parton scattering (DPS) mechanism or gluon fragmentation.

Keywords:

PACS: 13.87.Ce, 13.87.Fh, 14.40.Pq

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