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

LHCb Collaboration

doi:10.1140/epjc/s10052-025-13852-4

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

LHCb Collaboration

CERN
Institute of Physics
Swiss Federal Institute of Technology Lausanne
National Institute for Nuclear Physics
University of Padua
CAS - Institute of High Energy Physics
University of Chinese Academy of Sciences
University of Valencia
RWTH Aachen University
Central China Normal University
Tsinghua University
Center for High Energy Physics
University of Warwick
Peking University
Heidelberg University
University of Oxford
Hunan University
University of Bologna
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Max Planck Institute for Nuclear Physics
Department of Physics and Astronomy
University of Manchester
Université Paris-Saclay
University of Maryland, College Park
University of Genoa
Imperial College London
Consejo Nacional de Rectores (CONARE)

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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.

Original language	English
Article number	562
Journal	European Physical Journal C
Volume	85
Issue number	5
DOIs	https://doi.org/10.1140/epjc/s10052-025-13852-4
State	Published - May 2025
Externally published	Yes

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10.1140/epjc/s10052-025-13852-4

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@article{baf77949015c4bb8a90c063d29142ce2,

title = "Measurements of ψ(2S) and χc1(3872) production within fully reconstructed jets",

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\textbackslash{},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.",

author = "\{LHCb Collaboration\} and G. Zunica and D. Zuliani and Q. Zou and J. Zhuo and V. Zhukov and X. Zhu and X. Zhu and Zhu, \{L. Z.\} and V. Zhovkovska and Y. Zhou and X. Zhou and T. Zhou and Y. Zheng and Zheng, \{X. Z.\} and Zheng, \{S. Z.\} and A. Zhelezov and A. Zharkova and Y. Zhao and Zhang, \{Y. Z.\} and Y. Zhang and S. Zhang and S. Zhang and L. Zhang and J. Zhang and D. Zhang and C. Zhang and M. Zeng and C. Zeng and F. Zenesini and M. Zdybal and M. Zavertyaev and E. Zaffaroni and Y. Yuan and X. Yuan and J. Yu and Yu, \{C. Y.\} and X. Yin and H. Yin and H. Yeung and V. Yeroshenko and Z. Yang and Z. Yang and Y. Yang and X. Yang and S. Yang and K. Yang and D. Yang and Z. Xu and \{Castro Godinez\}, J. and \{Calderon Ramirez\}, S.",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2025.",

year = "2025",

month = may,

doi = "10.1140/epjc/s10052-025-13852-4",

language = "Ingl{\'e}s",

volume = "85",

journal = "European Physical Journal C",

issn = "1434-6044",

number = "5",

}

TY - JOUR

T1 - Measurements of ψ(2S) and χc1(3872) production within fully reconstructed jets

AU - LHCb Collaboration

AU - Zunica, G.

AU - Zuliani, D.

AU - Zou, Q.

AU - Zhuo, J.

AU - Zhukov, V.

AU - Zhu, X.

AU - Zhu, L. Z.

AU - Zhovkovska, V.

AU - Zhou, Y.

AU - Zhou, X.

AU - Zhou, T.

AU - Zheng, Y.

AU - Zheng, X. Z.

AU - Zheng, S. Z.

AU - Zhelezov, A.

AU - Zharkova, A.

AU - Zhao, Y.

AU - Zhang, Y. Z.

AU - Zhang, Y.

AU - Zhang, S.

AU - Zhang, L.

AU - Zhang, J.

AU - Zhang, D.

AU - Zhang, C.

AU - Zeng, M.

AU - Zeng, C.

AU - Zenesini, F.

AU - Zdybal, M.

AU - Zavertyaev, M.

AU - Zaffaroni, E.

AU - Yuan, Y.

AU - Yuan, X.

AU - Yu, J.

AU - Yu, C. Y.

AU - Yin, X.

AU - Yin, H.

AU - Yeung, H.

AU - Yeroshenko, V.

AU - Yang, Z.

AU - Yang, Y.

AU - Yang, X.

AU - Yang, S.

AU - Yang, K.

AU - Yang, D.

AU - Xu, Z.

AU - Castro Godinez, J.

AU - Calderon Ramirez, S.

PY - 2025/5

Y1 - 2025/5

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/105012445764

U2 - 10.1140/epjc/s10052-025-13852-4

DO - 10.1140/epjc/s10052-025-13852-4

M3 - Artículo

AN - SCOPUS:105012445764

SN - 1434-6044

VL - 85

JO - European Physical Journal C

JF - European Physical Journal C

IS - 5

M1 - 562

ER -

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

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