Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s = 13 TeV

LHCb Collaboration; W. Barter; F. Betti; A. Bohare; E. Buchanan; P. E. L. Clarke; R. Currie; S. Eisenhardt; D. Foulds-Holt; S. Gambetta; M. Kane; Y. Liu; F. Muheim; M. Needham; F. Oliva; K. Prasanth; L. Soares Lavra; A.R. Thomson-Strong; B. Urbach; C. Vrahas; M. R. J. Williams

doi:10.1007/JHEP04(2026)029

Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s = 13 TeV

LHCb Collaboration, W. Barter, F. Betti, A. Bohare, E. Buchanan, P. E. L. Clarke, R. Currie, S. Eisenhardt, D. Foulds-Holt, S. Gambetta, M. Kane, Y. Liu, F. Muheim, M. Needham, F. Oliva, K. Prasanth, L. Soares Lavra, A.R. Thomson-Strong, B. Urbach, C. VrahasM. R. J. Williams

School of Physics and Astronomy

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

Abstract

Charged-hadron distributions in heavy-flavor jets are measured in proton-proton
collisions at a center-of-mass energy of √s = 13 TeV collected by the LHCb experiment.
Distributions of the longitudinal momentum fraction, transverse momentum, and radial profile of charged hadrons are measured separately in beauty and charm jets. The distributions are compared to those previously measured by the LHCb collaboration in jets produced back-to-back with a Z boson, which in the forward region are primarily light-quark-initiated, to compare the hadronization mechanisms of heavy and light quarks. The observed differences between the heavy- and light-jet distributions are consistent with the heavy-quark dynamics expected to arise from the dead-cone effect, as well as with a hard fragmentation of the heavy-flavor hadron as previously measured in single-hadron fragmentation functions. This
measurement provides additional constraints for the extraction of collinear and transverse-momentum-dependent heavy-flavor fragmentation functions and offers another approach to probing the mechanisms that govern heavy-flavor hadronization.

Original language	English
Article number	29
Pages (from-to)	1-35
Number of pages	35
Journal	Journal of High Energy Physics
Volume	04
DOIs	https://doi.org/10.1007/JHEP04(2026)029
Publication status	Published - 2 Apr 2026

Keywords / Materials (for Non-textual outputs)

hadron-hadron scattering
jet physics
jet substructure and boosted jets
QCD

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10.1007/JHEP04(2026)029Licence: 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 → 30/09/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 30/09/26
Project: Research
Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
Barter, W. (Principal Investigator)
UKRI (formerly RCUK)
1/07/22 → 11/08/27
Project: Research

Cite this

LHCb Collaboration, Barter, W., Betti, F., Bohare, A., Buchanan, E., Clarke, P. E. L., Currie, R., Eisenhardt, S., Foulds-Holt, D., Gambetta, S., Kane, M., Liu, Y., Muheim, F., Needham, M., Oliva, F., Prasanth, K., Soares Lavra, L., Thomson-Strong, A. R., Urbach, B., ... Williams, M. R. J. (2026). Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s = 13 TeV. Journal of High Energy Physics, 04, 1-35. Article 29. https://doi.org/10.1007/JHEP04(2026)029

@article{055c72176a464b16a338339ae8f67c02,

title = "Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s = 13 TeV",

abstract = "Charged-hadron distributions in heavy-flavor jets are measured in proton-proton collisions at a center-of-mass energy of √s = 13 TeV collected by the LHCb experiment. Distributions of the longitudinal momentum fraction, transverse momentum, and radial profile of charged hadrons are measured separately in beauty and charm jets. The distributions are compared to those previously measured by the LHCb collaboration in jets produced back-to-back with a Z boson, which in the forward region are primarily light-quark-initiated, to compare the hadronization mechanisms of heavy and light quarks. The observed differences between the heavy- and light-jet distributions are consistent with the heavy-quark dynamics expected to arise from the dead-cone effect, as well as with a hard fragmentation of the heavy-flavor hadron as previously measured in single-hadron fragmentation functions. This measurement provides additional constraints for the extraction of collinear and transverse-momentum-dependent heavy-flavor fragmentation functions and offers another approach to probing the mechanisms that govern heavy-flavor hadronization.",

keywords = "hadron-hadron scattering, jet physics, jet substructure and boosted jets, QCD",

author = "\{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 D. Foulds-Holt and S. Gambetta and M. Kane and Y. Liu and F. Muheim and M. Needham and F. Oliva and K. Prasanth and \{Soares Lavra\}, L. and A.R. Thomson-Strong and B. Urbach and C. Vrahas and Williams, \{M. R. J.\}",

year = "2026",

month = apr,

day = "2",

doi = "10.1007/JHEP04(2026)029",

language = "English",

volume = "04",

pages = "1--35",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

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LHCb Collaboration, Barter, W, Betti, F, Bohare, A, Buchanan, E , Clarke, PEL , Currie, R , Eisenhardt, S , Foulds-Holt, D , Gambetta, S , Kane, M, Liu, Y, Muheim, F , Needham, M , Oliva, F , Prasanth, K , Soares Lavra, L, Thomson-Strong, AR, Urbach, B, Vrahas, C & Williams, MRJ 2026, 'Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s = 13 TeV', Journal of High Energy Physics, vol. 04, 29, pp. 1-35. https://doi.org/10.1007/JHEP04(2026)029

TY - JOUR

T1 - Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s = 13 TeV

AU - 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 - Foulds-Holt, D.

AU - Gambetta, S.

AU - Kane, M.

AU - Liu, Y.

AU - Muheim, F.

AU - Needham, M.

AU - Oliva, F.

AU - Prasanth, K.

AU - Soares Lavra, L.

AU - Thomson-Strong, A.R.

AU - Urbach, B.

AU - Vrahas, C.

AU - Williams, M. R. J.

PY - 2026/4/2

Y1 - 2026/4/2

N2 - Charged-hadron distributions in heavy-flavor jets are measured in proton-proton collisions at a center-of-mass energy of √s = 13 TeV collected by the LHCb experiment. Distributions of the longitudinal momentum fraction, transverse momentum, and radial profile of charged hadrons are measured separately in beauty and charm jets. The distributions are compared to those previously measured by the LHCb collaboration in jets produced back-to-back with a Z boson, which in the forward region are primarily light-quark-initiated, to compare the hadronization mechanisms of heavy and light quarks. The observed differences between the heavy- and light-jet distributions are consistent with the heavy-quark dynamics expected to arise from the dead-cone effect, as well as with a hard fragmentation of the heavy-flavor hadron as previously measured in single-hadron fragmentation functions. This measurement provides additional constraints for the extraction of collinear and transverse-momentum-dependent heavy-flavor fragmentation functions and offers another approach to probing the mechanisms that govern heavy-flavor hadronization.

AB - Charged-hadron distributions in heavy-flavor jets are measured in proton-proton collisions at a center-of-mass energy of √s = 13 TeV collected by the LHCb experiment. Distributions of the longitudinal momentum fraction, transverse momentum, and radial profile of charged hadrons are measured separately in beauty and charm jets. The distributions are compared to those previously measured by the LHCb collaboration in jets produced back-to-back with a Z boson, which in the forward region are primarily light-quark-initiated, to compare the hadronization mechanisms of heavy and light quarks. The observed differences between the heavy- and light-jet distributions are consistent with the heavy-quark dynamics expected to arise from the dead-cone effect, as well as with a hard fragmentation of the heavy-flavor hadron as previously measured in single-hadron fragmentation functions. This measurement provides additional constraints for the extraction of collinear and transverse-momentum-dependent heavy-flavor fragmentation functions and offers another approach to probing the mechanisms that govern heavy-flavor hadronization.

KW - hadron-hadron scattering

KW - jet physics

KW - jet substructure and boosted jets

KW - QCD

U2 - 10.1007/JHEP04(2026)029

DO - 10.1007/JHEP04(2026)029

M3 - Article

SN - 1126-6708

VL - 04

SP - 1

EP - 35

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

M1 - 29

ER -

Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at √s = 13 TeV

Abstract

Keywords / Materials (for Non-textual outputs)

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Projects

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