Measurement of associated J/ψ-ψ(2S) production cross-section in pp collisions at $$ \sqrt{s} $$ = 13 TeV

Brundu, D.;Contu, A.;De Angelis, C.;Dettori, F.;Dordei, F.;Fabiano, F.;Litvinov, R.;Manca, G.;Oldeman, R.;Saitta, B.;Sun, J.;
2024-01-01

Abstract

The cross-section of associated J/ψ-ψ(2S) production in proton-proton collisions at a centre-of-mass energy of √ s = 13 TeV is measured using a data sample corresponding to an integrated luminosity of 4.2 fb−1 , collected by the LHCb experiment. The measurement is performed for both J/ψ and ψ(2S) mesons having transverse momentum pT < 14 GeV/c and rapidity 2.0 < y < 4.5, assuming negligible polarisation of the J/ψ and ψ(2S) mesons. The production cross-section is measured to be 4.5 ± 0.7 ± 0.3 nb, where the frst uncertainty is statistical and the second systematic. The diferential cross-sections are measured as functions of several kinematic variables of the J/ψ-ψ(2S) candidates. The results are combined with a measurement of J/ψ-J/ψ production, giving a cross-section ratio between J/ψ-ψ(2S) and J/ψ-J/ψ production of 0.274 ± 0.044 ± 0.008, where the frst uncertainty is statistical and the second systematic.
2024
Hadron-Hadron Scattering, Multi-Parton Interactions, QCD, Quarkonium
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