Study of J/ψ production in jets

Abstract : 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, z≡pT(J/ψ)/pT(jet), is measured using jets with pT(jet)>20 GeV in the pseudorapidity range 2.5<η(jet)<4.0. The observed z 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 non-relativistic QCD. This is the first measurement of the pT fraction carried by prompt J/ψ mesons in jets at any experiment.
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Submitted on : Thursday, January 19, 2017 - 11:11:15 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Study of J/ψ production in jets. Physical Review Letters, American Physical Society, 2017, 118, pp.192001 ⟨10.1103/PhysRevLett.118.192001⟩. ⟨in2p3-01440279⟩

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