Study of J/$\psi$ meson production inside jets in pp collisions at $\sqrt{s}=$ 8 TeV

Abstract

A study of the production of prompt J/$\psi$ mesons contained in jets in proton-proton collisions at $\sqrt{s}=$ 8 TeV 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/$\psi$ meson and the jet is used to test whether the J/$\psi$ meson is part of the jet. The analysis shows that most prompt J/$\psi$ mesons with energy above 15 GeV and rapidity $|y|<$ 1 are contained in jets with pseudorapidity $|{\eta }_{\text{jet}}|$ $<$ 1. The differential distributions of the probability to have a J/$\psi$ meson contained in a jet as a function of jet energy for a fixed J/$\psi$ 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/$\psi$ mesons are predicted to be unpolarized. This technique demonstrates a new way to test predictions for prompt J/$\psi$ production using nonrelativistic quantum chromodynamics.

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-15-003 (CMS Public Pages)

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• Shedding Light on Hadronization by Quarkonium Energy Correlator
• Resummation of threshold double logarithms in hadroproduction of heavy quarkonium
• Measurements of $\psi (2S)$ and ${\chi }_{c1}(3872)$ production within fully reconstructed jets
• Non-Relativistic Quantum Chromodynamics in Parton Showers