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 13TeV. The fraction of the jet transverse momentum carried by the J/ψ meson, z(J/ψ)≡p_{T}(J/ψ)/p_{T}(jet), is measured using jets with p_{T}(jet)>20 GeV in the pseudorapidity range 2.5<η(jet)<4.0. The observed z(J/ψ) 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 p_{T} fraction carried by prompt J/ψ mesons in jets at any experiment.
Highlights
The unfolded 1⁄2zðJ=ψÞ; pTðjetÞ distributions are integrated for pTðjetÞ > 20 GeV to produce the measured zðJ=ψÞ spectra
Wrong primary vertex (PV) ~t [ps]LHCb s = 13 TeV 20 < p < 30 GeV mass [45], and pLðJ=ψÞ is the component of the J=ψ momentum longitudinal to the beam axis
The yield of J=ψ → μþμ− decays reconstructed in each 1⁄2zðJ=ψÞ; pTðjetÞ bin, which includes J=ψ mesons produced promptly and in b-hadron decays, is determined from an unbinned maximum likelihood fit to the corresponding dimuon invariant-mass distribution
Summary
The unfolded 1⁄2zðJ=ψÞ; pTðjetÞ distributions are integrated for pTðjetÞ > 20 GeV to produce the measured zðJ=ψÞ spectra. The yield of J=ψ → μþμ− decays reconstructed in each 1⁄2zðJ=ψÞ; pTðjetÞ bin, which includes J=ψ mesons produced promptly and in b-hadron decays, is determined from an unbinned maximum likelihood fit to the corresponding dimuon invariant-mass distribution.
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