Abstract: A study of the production of prompt J/? mesons contained in jets in proton-proton collisions at ?s=8TeV is presented. The analysis is based on data corresponding to an integrated luminosity of 19.1 fb-1 collected with the CMS detector at the LHC. For events with at least one observed jet, the angular separation between the J/? meson and the jet is used to test whether the J/? meson is part of the jet. The analysis shows that most prompt J/? mesons having energy above 15 GeV and rapidity |y|<1 are contained in jets with pseudorapidity |?jet|<1. The differential distributions of the probability to have a J/? meson contained in a jet as a function of jet energy for a fixed J/? energy fraction are compared to a theoretical model using the fragmenting jet function approach. The data agree best with fragmenting jet function calculations that use a long-distance matrix element parameter set in which prompt J/? mesons are predicted to be unpolarized. This technique demonstrates a new way to test predictions for prompt J/? production using nonrelativistic quantum chromodynamics.

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