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  • Open Access

Constraining color-charge effects of partonic energy loss with jet-axis-based inclusive jet substructure measurement

Raghunath Pradhan* and Olga Evdokimov†

  • *Contact author: raghunath.pradhan@cern.ch
  • †Contact author: evdolga@uic.edu
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Phys. Rev. C 112, 064914 – Published 22 December, 2025

DOI: https://doi.org/10.1103/cj9y-mcxj

Abstract

This study investigates the color-charge dependence of parton energy loss in the quark-gluon plasma (QGP) medium and the associated relative modifications of quark and gluon jet fractions compared to vacuum, using jet axis decorrelation observables. Recent CMS jet axis decorrelation measurements in PbPb collisions at 5.02 TeV are interpreted using Pythia simulations with varied quark/gluon jet compositions and emulated color-charge dependent energy loss. A template-fit procedure is employed to estimate the limits on gluon jet fractions in the published CMS data and average shift in jet momentum due to quenching for quark- and gluon-initiated jets traversing the QGP. The extracted gluon jet fractions and the estimated quark and gluon energy losses based on this study of jet axis decorrelations are found to be consistent with other model calculations based on inclusive observables. This work illustrates the use of jet substructure measurements for providing constraints on the color-charge dependence of parton energy loss and offers valuable insights for jet quenching models.

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Phys. Rev. C 112, 064914– Published 22 December, 2025
  • Received 9 September 2025
  • Accepted 24 November 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

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