Sirunyan, A. M.Işıldak, Bora2024-03-122024-03-122020-05-100370-2693http://hdl.handle.net/10679/9293https://doi.org/10.1016/j.physletb.2020.135409A study of the production of prompt J/ψ 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/ψ meson and the jet is used to test whether the J/ψ meson is part of the jet. The analysis shows that most prompt J/ψ mesons having energy above 15 GeV and rapidity |y|<1 are contained in jets with pseudorapidity |ηjet|<1. The differential distributions of the probability to have a J/ψ meson contained in a jet as a function of jet energy for a fixed J/ψ 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/ψ mesons are predicted to be unpolarized. This technique demonstrates a new way to test predictions for prompt J/ψ production using nonrelativistic quantum chromodynamics.engopenAccessAttribution 4.0 Internationalhttps://creativecommons.org/licenses/by/4.0/article80400061306880000110.1016/j.physletb.2020.135409CMSJ/psi MesonsJets2-s2.0-85082850250