This paper presents the first measurement of Psi(2S) and chi_{c1}(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J/Psi(->mu+mu-)pi+pi- final state in the forward region using proton-proton collision data collected by the LHCb experiment at the center-of-mass-energy of 13TeV in 2016, corresponding to an integrated luminosity of 1.64\,fb-1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)), is measured differentially in pT(jet) and pT(tag) bins. The distributions are separated into promptly produced quarkonia from proton-proton collisions and quarkonia produced from displaced b-hadron decays. While the displaced quarkonia fragmentation functions are in general well described by parton-shower predictions, the prompt quarkonium distributions differ significantly from fixed-order non-relativistic QCD (NRQCD) predictions followed by a QCD parton shower.
Measurements of Psi(2S) and Chi_{c1}(3872) production within fully reconstructed jets
Riccardi D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Bassi G.Membro del Collaboration Group
;
2025
Abstract
This paper presents the first measurement of Psi(2S) and chi_{c1}(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J/Psi(->mu+mu-)pi+pi- final state in the forward region using proton-proton collision data collected by the LHCb experiment at the center-of-mass-energy of 13TeV in 2016, corresponding to an integrated luminosity of 1.64\,fb-1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)), is measured differentially in pT(jet) and pT(tag) bins. The distributions are separated into promptly produced quarkonia from proton-proton collisions and quarkonia produced from displaced b-hadron decays. While the displaced quarkonia fragmentation functions are in general well described by parton-shower predictions, the prompt quarkonium distributions differ significantly from fixed-order non-relativistic QCD (NRQCD) predictions followed by a QCD parton shower.| File | Dimensione | Formato | |
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s10052-025-13852-4.pdf
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