This paper presents the first measurement of ψ(2S) and χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J/ψ(→μ+μ-)π+π- 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 ψ(2S) and χc1(3872) production within fully reconstructed jets / Zunica, G., Zuliani, D., Zou, Q., Zhuo, J., Zhukov, V., Zhu, X., Zhu, X., Zhu, L.Z., Zhovkovska, V., Zhou, Y., Zhou, X., Zhou, T., Zheng, Y., Zheng, X.Z., Zheng, S.Z., Zhelezov, A., Zharkova, A., Zhao, Y., Zhang, Y.Z., Zhang, Y., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 85:5(2025), pp. 0-0. [10.1140/epjc/s10052-025-13852-4]

Measurements of ψ(2S) and χc1(3872) production within fully reconstructed jets

Bizzeti A.;
2025

Abstract

This paper presents the first measurement of ψ(2S) and χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J/ψ(→μ+μ-)π+π- 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.
2025
85
5
0
0
Measurements of ψ(2S) and χc1(3872) production within fully reconstructed jets / Zunica, G., Zuliani, D., Zou, Q., Zhuo, J., Zhukov, V., Zhu, X., Zhu, X., Zhu, L.Z., Zhovkovska, V., Zhou, Y., Zhou, X., Zhou, T., Zheng, Y., Zheng, X.Z., Zheng, S.Z., Zhelezov, A., Zharkova, A., Zhao, Y., Zhang, Y.Z., Zhang, Y., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 85:5(2025), pp. 0-0. [10.1140/epjc/s10052-025-13852-4]
Zunica, G.; Zuliani, D.; Zou, Q.; Zhuo, J.; Zhukov, V.; Zhu, X.; Zhu, X.; Zhu, L. Z.; Zhovkovska, V.; Zhou, Y.; Zhou, X.; Zhou, T.; Zheng, Y.; Zheng, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1392458
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