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Flavor-changing nonglobal logarithms

Andrew J. Larkoski*

  • *Contact author: larkoski@aps.org
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Phys. Rev. D 113, 034013 – Published 11 February, 2026

DOI: https://doi.org/10.1103/4jvb-24hk

Abstract

Nonglobal logarithms are low energy correlations between the substructure of a jet and the event in which it is immersed. We study the leading nonglobal logarithms that arise from soft quark-antiquark emission and calculate their coefficient as a series in the jet radius, R, in arbitrary processes. We calculate the exact coefficient through quadratic order in R, and show that this truncation is within 5% of the complete result for radii up to R=1. These quark flavor-dependent nonglobal logarithms are also responsible for the infrared unsafety of a naïve definition of jet flavor that is simply the net sum of quark flavors in the jet of interest. We propose a small modification of this naïve jet flavor that we call subtractive jet flavor in which the problematic soft logarithms are explicitly subtracted. We further demonstrate how our analytic results can be interfaced with automated numerical fixed-order codes to extract subtractive jet flavor cross sections.

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Phys. Rev. D 113, 034013– Published 11 February, 2026
  • Received 23 October 2025
  • Accepted 21 January 2026
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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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