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Study of $J/\psi$ production in jets


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Study of $J/\psi$ production in jets. Physical Review Letters, 118(19):192001.

Abstract

The production of $J/\psi$ 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 $J/\psi$ meson, $\mathcal{z}(J/\psi \equiv p_T(J/\psi)/p_T(jet)$, is measured using jets with $p_T$(jet) > 20  GeV in the pseudorapidity range $2.5 < \eta(jet) < 4.0$. The observed $\mathcal{z}(J/\psi)$ distribution for $J/\psi$ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt $J/\psi$ 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 $J/\psi$ mesons in jets at any experiment.

Abstract

The production of $J/\psi$ 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 $J/\psi$ meson, $\mathcal{z}(J/\psi \equiv p_T(J/\psi)/p_T(jet)$, is measured using jets with $p_T$(jet) > 20  GeV in the pseudorapidity range $2.5 < \eta(jet) < 4.0$. The observed $\mathcal{z}(J/\psi)$ distribution for $J/\psi$ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt $J/\psi$ 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 $J/\psi$ mesons in jets at any experiment.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:08 Feb 2018 11:53
Last Modified:19 Feb 2018 10:44
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevLett.118.192001

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