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  • Open Access

Medium modifications to jet angularities using SCET with Glauber gluons

Ankita Budhraja*, Rishi Sharma†, and Balbeer Singh‡

  • *Contact author: ankita@theory.tifr.res.in
  • †Contact author: rishi@theory.tifr.res.in
  • ‡Contact author: balbeer@theory.tifr.res.in
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Phys. Rev. D 112, 034017 – Published 18 August, 2025

DOI: https://doi.org/10.1103/r12p-3jbm

Abstract

We perform a comprehensive analysis of medium modifications on ungroomed jet angularities, τa, within the framework of soft-collinear effective theory with Glauber gluons (SCETG). Angularities are a one-parameter family of jet substructure observables with angularity exponent a<2 for infrared safety. Variation of the angularity exponent allows one to modify the relative weighting of the collinear-to-soft radiations in the jet, thereby giving access to different moments of the jet transverse momentum spectrum. In this article, we focus on a<1 and provide detailed results for a=−1, 0, and 0.5. Within SCETG, the interactions between jet and medium constituents are mediated by off-shell Glauber gluons generated from the color sources in the medium. While medium modifications are incorporated into the jet function via the use of medium-induced splitting functions, the soft function remains unmodified for a<1. For all values of a, we find that compared to jets in vacuum, the medium-modified distributions are shifted towards smaller values of jet angularity and have a steeper fall. This redistribution of the ungroomed angularity spectrum is more apparent for a jet with a larger cone size and for higher values of a. We also present results for the medium sensitivity towards pT of the jet and for a jet initiated in a less central event (10%–30% centrality). Finally, we provide the ratios of nucleus-nucleus and proton-proton differential angularity distributions for different angularity exponents and for two values of the jet radius parameter.

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Phys. Rev. D 112, 034017– Published 18 August, 2025
  • Received 3 December 2024
  • Accepted 10 July 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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