Study of J=ψ Production in Jets

LHCb Collaboration, R Aaij, Marco Adinolfi, Emma Buchanan, Andrew Cook, Jeremy Dalseno, Sam Harnew, James Kariuki, Paras Naik, Konstantinos Petridis, Gabriela Pomery, Eugenia Price, Claire Prouve, Renato Quagliani, Jonas Rademacker, Sophie Richards, Daniel Saunders, Nicola Skidmore, Jaap Velthuis

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The production of J=ψ mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 TeV. The fraction of the jet transverse momentum carried by the J=ψ meson, zðJ=ψÞ ≡ pTðJ=ψÞ=pTðjetÞ, is measured using jets with pTðjetÞ > 20 GeV in the pseudorapidity range 2.5 < ηðjetÞ < 4.0. The observed zðJ=ψÞ distribution for J=ψ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt J=ψ production do not agree with predictions based on fixed-order nonrelativistic QCD. This is the first measurement of the pT fraction carried by prompt J=ψ mesons in jets at any experiment.
Original languageEnglish
JournalPhysical Review Letters
Publication statusPublished - 8 May 2017


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