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

The LHCb Collaboration; W. Barter; F. Betti; A. Bohare; E. Buchanan; P. E. L. Clarke; R. Currie; S. Eisenhardt; K. Farmer; S. Gambetta; M. Kane; Y. Liu; M. Needham; F. Oliva; R.H. O'Neil; O. Ozcelik; M. Richardson-Slipper; G. Sarpis; L. Soares Lavra; C. Vrahas; M. R. J. Williams

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

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

The LHCb Collaboration, W. Barter, F. Betti, A. Bohare, E. Buchanan, P. E. L. Clarke, R. Currie, S. Eisenhardt, K. Farmer, S. Gambetta, M. Kane, Y. Liu, M. Needham, F. Oliva, R.H. O'Neil, O. Ozcelik, M. Richardson-Slipper, G. Sarpis, L. Soares Lavra, C. VrahasM. R. J. Williams

School of Physics and Astronomy

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

Abstract

This paper presents the first measurement of ψ(2S)ψ(2S) and χc1(3872)χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J ⁣/ψJ/ψ(→μ+μ−→μ+μ−)π+π−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 13TeV13TeV in 2016, corresponding to an integrated luminosity of 1.64 fb−11.64fb−1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)pT(tag)/pT(jet)), is measured differentially in pT(jet)pT(jet) and pT(tag)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
Pages (from-to)	1-24
Number of pages	24
Journal	The European Physical Journal C
Volume	85
Issue number	5
DOIs	https://doi.org/10.1140/epjc/s10052-025-13852-4
Publication status	Published - 22 May 2025

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10.1140/epjc/s10052-025-13852-4Licence: Creative Commons: Attribution (CC-BY)

3 Active
4 Finished

Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 31/03/26
Project: Research
Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
Barter, W. (Principal Investigator)
UKRI (formerly RCUK)
1/07/22 → 30/06/27
Project: Research

Cite this

The LHCb Collaboration, Barter, W., Betti, F., Bohare, A., Buchanan, E., Clarke, P. E. L., Currie, R., Eisenhardt, S., Farmer, K., Gambetta, S., Kane, M., Liu, Y., Needham, M., Oliva, F., O'Neil, R. H., Ozcelik, O., Richardson-Slipper, M., Sarpis, G., Lavra, L. S., ... Williams, M. R. J. (2025). Measurements of ψ(2S)ψ(2S) and χc1(3872)χc1(3872) production within fully reconstructed jets. The European Physical Journal C, 85(5), 1-24. Article 562. https://doi.org/10.1140/epjc/s10052-025-13852-4

@article{8e4796de7eff4467bfc56f22b0ff73d8,

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

abstract = "This paper presents the first measurement of ψ(2S)ψ(2S) and χc1(3872)χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J ⁣/ψJ/ψ(→μ+μ−→μ+μ−)π+π−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 13TeV13TeV in 2016, corresponding to an integrated luminosity of 1.64 fb−11.64fb−1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)pT(tag)/pT(jet)), is measured differentially in pT(jet)pT(jet) and pT(tag)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 = "\{The LHCb Collaboration\} and W. Barter and F. Betti and A. Bohare and E. Buchanan and Clarke, \{P. E. L.\} and R. Currie and S. Eisenhardt and K. Farmer and S. Gambetta and M. Kane and Y. Liu and M. Needham and F. Oliva and R.H. O'Neil and O. Ozcelik and M. Richardson-Slipper and G. Sarpis and Lavra, \{L. Soares\} and C. Vrahas and Williams, \{M. R. J.\}",

year = "2025",

month = may,

day = "22",

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

language = "English",

volume = "85",

pages = "1--24",

journal = "The European Physical Journal C",

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The LHCb Collaboration, Barter, W , Betti, F, Bohare, A, Buchanan, E , Clarke, PEL , Currie, R , Eisenhardt, S, Farmer, K, Gambetta, S , Kane, M, Liu, Y, Needham, M , Oliva, F, O'Neil, RH, Ozcelik, O, Richardson-Slipper, M, Sarpis, G, Lavra, LS, Vrahas, C & Williams, MRJ 2025, 'Measurements of ψ(2S)ψ(2S) and χc1(3872)χc1(3872) production within fully reconstructed jets', The European Physical Journal C, vol. 85, no. 5, 562, pp. 1-24. https://doi.org/10.1140/epjc/s10052-025-13852-4

TY - JOUR

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

AU - The LHCb Collaboration

AU - Barter, W.

AU - Betti, F.

AU - Bohare, A.

AU - Buchanan, E.

AU - Clarke, P. E. L.

AU - Currie, R.

AU - Eisenhardt, S.

AU - Farmer, K.

AU - Gambetta, S.

AU - Kane, M.

AU - Liu, Y.

AU - Needham, M.

AU - Oliva, F.

AU - O'Neil, R.H.

AU - Ozcelik, O.

AU - Richardson-Slipper, M.

AU - Sarpis, G.

AU - Lavra, L. Soares

AU - Vrahas, C.

AU - Williams, M. R. J.

PY - 2025/5/22

Y1 - 2025/5/22

N2 - This paper presents the first measurement of ψ(2S)ψ(2S) and χc1(3872)χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J ⁣/ψJ/ψ(→μ+μ−→μ+μ−)π+π−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 13TeV13TeV in 2016, corresponding to an integrated luminosity of 1.64 fb−11.64fb−1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)pT(tag)/pT(jet)), is measured differentially in pT(jet)pT(jet) and pT(tag)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)ψ(2S) and χc1(3872)χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J ⁣/ψJ/ψ(→μ+μ−→μ+μ−)π+π−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 13TeV13TeV in 2016, corresponding to an integrated luminosity of 1.64 fb−11.64fb−1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)pT(tag)/pT(jet)), is measured differentially in pT(jet)pT(jet) and pT(tag)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.

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

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

M3 - Article

SN - 1434-6044

VL - 85

SP - 1

EP - 24

JO - The European Physical Journal C

JF - The European Physical Journal C

IS - 5

M1 - 562

ER -

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

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Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons

Cite this

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