Measurement of jet track functions in pp collisions at s=13 TeV with the ATLAS detector

G. Aad; T.P.A. Åkesson; K.S.V. Astrand; C. Doglioni; P.A. Ekman; V. Hedberg; H. Herde; B. Konya; E. Lytken; R. Poettgen; O. Smirnova; E.J. Wallin; L. Zwalinski; ATLAS Collaboration

doi:10.1016/j.physletb.2025.139680

Measurement of jet track functions in pp collisions at s=13 TeV with the ATLAS detector

G. Aad, T.P.A. Åkesson, K.S.V. Astrand, C. Doglioni, P.A. Ekman, V. Hedberg, H. Herde, B. Konya, E. Lytken, R. Poettgen, O. Smirnova, E.J. Wallin, L. Zwalinski, ATLAS Collaboration

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Abstract

Measurements of jet substructure are key to probing the energy frontier at colliders, and many of them use track-based observables which take advantage of the angular precision of tracking detectors. Theoretical calculations of track-based observables require ‘track functions’, which characterize the transverse momentum fraction rq carried by charged hadrons from a fragmenting quark or gluon. This letter presents a direct measurement of rq distributions in dijet events from the 140 fb−1 of proton–proton collisions at s=13 TeV recorded with the ATLAS detector. The data are corrected for detector effects using machine-learning methods. The scale evolution of the moments of the rq distribution is sensitive to non-linear renormalization group evolution equations of QCD, and is compared with analytic predictions. When incorporated into future theoretical calculations, these results will enable a precision program of theory-data comparison for track-based jet substructure observables. © 2025 CERN for the benefit of the ATLAS Collaboration

Original language	English
Article number	139680
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	868
DOIs	https://doi.org/10.1016/j.physletb.2025.139680
Publication status	Published - 2025

Subject classification (UKÄ)

Subatomic Physics

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Aad, G., Åkesson, T. P. A., Astrand, K. S. V., Doglioni, C., Ekman, P. A., Hedberg, V., Herde, H., Konya, B., Lytken, E., Poettgen, R., Smirnova, O., Wallin, E. J., Zwalinski, L., & ATLAS Collaboration (2025). Measurement of jet track functions in pp collisions at s=13 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 868, Article 139680. https://doi.org/10.1016/j.physletb.2025.139680

@article{9f2920aebd434e569a4b28c23c667fd8,

title = "Measurement of jet track functions in pp collisions at s=13 TeV with the ATLAS detector",

abstract = "Measurements of jet substructure are key to probing the energy frontier at colliders, and many of them use track-based observables which take advantage of the angular precision of tracking detectors. Theoretical calculations of track-based observables require {\textquoteleft}track functions{\textquoteright}, which characterize the transverse momentum fraction rq carried by charged hadrons from a fragmenting quark or gluon. This letter presents a direct measurement of rq distributions in dijet events from the 140 fb−1 of proton–proton collisions at s=13 TeV recorded with the ATLAS detector. The data are corrected for detector effects using machine-learning methods. The scale evolution of the moments of the rq distribution is sensitive to non-linear renormalization group evolution equations of QCD, and is compared with analytic predictions. When incorporated into future theoretical calculations, these results will enable a precision program of theory-data comparison for track-based jet substructure observables. {\textcopyright} 2025 CERN for the benefit of the ATLAS Collaboration",

author = "G. Aad and T.P.A. {\AA}kesson and K.S.V. Astrand and C. Doglioni and P.A. Ekman and V. Hedberg and H. Herde and B. Konya and E. Lytken and R. Poettgen and O. Smirnova and E.J. Wallin and L. Zwalinski and \{ATLAS Collaboration\}",

year = "2025",

doi = "10.1016/j.physletb.2025.139680",

language = "English",

volume = "868",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

Aad, G, Åkesson, TPA , Astrand, KSV, Doglioni, C, Ekman, PA, Hedberg, V , Herde, H , Konya, B , Lytken, E , Poettgen, R , Smirnova, O , Wallin, EJ, Zwalinski, L & ATLAS Collaboration 2025, 'Measurement of jet track functions in pp collisions at s=13 TeV with the ATLAS detector', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 868, 139680. https://doi.org/10.1016/j.physletb.2025.139680

TY - JOUR

T1 - Measurement of jet track functions in pp collisions at s=13 TeV with the ATLAS detector

AU - Aad, G.

AU - Åkesson, T.P.A.

AU - Astrand, K.S.V.

AU - Doglioni, C.

AU - Ekman, P.A.

AU - Hedberg, V.

AU - Herde, H.

AU - Konya, B.

AU - Lytken, E.

AU - Poettgen, R.

AU - Smirnova, O.

AU - Wallin, E.J.

AU - Zwalinski, L.

AU - ATLAS Collaboration

PY - 2025

Y1 - 2025

N2 - Measurements of jet substructure are key to probing the energy frontier at colliders, and many of them use track-based observables which take advantage of the angular precision of tracking detectors. Theoretical calculations of track-based observables require ‘track functions’, which characterize the transverse momentum fraction rq carried by charged hadrons from a fragmenting quark or gluon. This letter presents a direct measurement of rq distributions in dijet events from the 140 fb−1 of proton–proton collisions at s=13 TeV recorded with the ATLAS detector. The data are corrected for detector effects using machine-learning methods. The scale evolution of the moments of the rq distribution is sensitive to non-linear renormalization group evolution equations of QCD, and is compared with analytic predictions. When incorporated into future theoretical calculations, these results will enable a precision program of theory-data comparison for track-based jet substructure observables. © 2025 CERN for the benefit of the ATLAS Collaboration

AB - Measurements of jet substructure are key to probing the energy frontier at colliders, and many of them use track-based observables which take advantage of the angular precision of tracking detectors. Theoretical calculations of track-based observables require ‘track functions’, which characterize the transverse momentum fraction rq carried by charged hadrons from a fragmenting quark or gluon. This letter presents a direct measurement of rq distributions in dijet events from the 140 fb−1 of proton–proton collisions at s=13 TeV recorded with the ATLAS detector. The data are corrected for detector effects using machine-learning methods. The scale evolution of the moments of the rq distribution is sensitive to non-linear renormalization group evolution equations of QCD, and is compared with analytic predictions. When incorporated into future theoretical calculations, these results will enable a precision program of theory-data comparison for track-based jet substructure observables. © 2025 CERN for the benefit of the ATLAS Collaboration

U2 - 10.1016/j.physletb.2025.139680

DO - 10.1016/j.physletb.2025.139680

M3 - Article

SN - 0370-2693

VL - 868

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 139680

ER -

Measurement of jet track functions in pp collisions at s=13 TeV with the ATLAS detector

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