Study of J/ψ meson production inside jets in pp collisions at s=8TeV

The CMS Collaboration

Research output: Contribution to journalArticle

Abstract

A 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.

Original languageEnglish
Article number135409
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume804
DOIs
Publication statusPublished - 2020 May 10

Keywords

  • CMS
  • J/psi Mesons
  • Jets

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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