The production cross-sections of J/psi mesons in proton-proton collisions at a centre-of-mass energy of root s = 5TeV are measured using a data sample corresponding to an integrated luminosity of 9.13 +/- 0.18 pb(-1), collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, p(T), and rapidity, y, and separately for J/psi mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised J/psi mesons, the production cross-sections integrated over the kinematic range 0 < p(T) < 20 GeV/c and 2.0 < y < 4.5 are sigma(prompt) J/psi = 8.154 +/- 0.010 +/- 0.283 mu b, sigma(nonprompt) J/psi = 0.820 +/- 0.003 +/- 0.034 mu b, where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at root s = 8TeV and 13TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for J/psi mesons at a centre-of-mass energy per nucleon pair of root s(NN) = 5TeV. The results are compared with theoretical predictions.

Measurement of J/psi production cross-sections in pp collisions at root s=5 TeV

Bassi, G.
Membro del Collaboration Group
;
Kleijne, N.
Membro del Collaboration Group
;
Lusiani, A.
Membro del Collaboration Group
;
Morello, M. J.
Membro del Collaboration Group
;
Pica, L.
Membro del Collaboration Group
;
Ribatti, R.;
2021

Abstract

The production cross-sections of J/psi mesons in proton-proton collisions at a centre-of-mass energy of root s = 5TeV are measured using a data sample corresponding to an integrated luminosity of 9.13 +/- 0.18 pb(-1), collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, p(T), and rapidity, y, and separately for J/psi mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised J/psi mesons, the production cross-sections integrated over the kinematic range 0 < p(T) < 20 GeV/c and 2.0 < y < 4.5 are sigma(prompt) J/psi = 8.154 +/- 0.010 +/- 0.283 mu b, sigma(nonprompt) J/psi = 0.820 +/- 0.003 +/- 0.034 mu b, where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at root s = 8TeV and 13TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for J/psi mesons at a centre-of-mass energy per nucleon pair of root s(NN) = 5TeV. The results are compared with theoretical predictions.
2021
Settore FIS/01 - Fisica Sperimentale
Hadron-Hadron scattering (experiments); Heavy quark production; QCD; Quarkonium
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/113082
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