Study of J/psi meson production inside jets in pp collisions at sqrt(s) = 8 TeVстатья
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Дата последнего поиска статьи во внешних источниках: 16 сентября 2020 г.
Аннотация:A study of the production of prompt J/ψ\psiψ mesons contained in jets in proton-proton collisions at s=\sqrt{s} =s= 8 TeV is presented. The analysis is based on data corresponding to an integrated luminosity of 19.1 fb−1^{-1}−1 collected with the CMS detector at the LHC. For events with at least one observed jet, the angular separation between the J/ψ\psiψ meson and the jet is used to test whether the J/ψ\psiψ meson is part of the jet. The analysis shows that most prompt J/ψ\psiψ mesons with energy above 15 GeV and rapidity ∣y∣<|y|<∣y∣< 1 are contained in jets with pseudorapidity ∣ηjet∣|\eta_{\text{jet}}|∣ηjet∣ <<< 1. The differential distributions of the probability to have a J/ψ\psiψ meson contained in a jet as a function of jet energy for a fixed J/ψ\psiψ 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\psiψ mesons are predicted to be unpolarized. This technique demonstrates a new way to test predictions for prompt J/ψ\psiψ production using nonrelativistic quantum chromodynamics.