TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
PY  - 2021
DA  - 2021//
TI  - Measurement of J/psi production cross-sections in pp collisions at root s=5 TeV
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 181
EP  - 32pp
VL  - 11
IS  - 11
PB  - Springer
KW  - Hadron-Hadron scattering (experiments)
KW  - Heavy quark production
KW  - QCD
KW  - Quarkonium
AB  - 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 μb, sigma(nonprompt) J/psi = 0.820 +/- 0.003 +/- 0.034 μb, 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.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2109.00220
UR  - https://doi.org/10.1007/JHEP11(2021)181
DO  - 10.1007/JHEP11(2021)181
LA  - English
N1  - WOS:000723655700003
ID  - LHCbCollaborationAaij_etal2021
ER  -