Jet broadening in the opacity and twist expansions
Authors
Clayton, Hannah
Sievert, Matthew D
Horowitz, WA
Publication Date
2022-05-12Journal Title
The European Physical Journal C
ISSN
1434-6044
Publisher
Springer Berlin Heidelberg
Volume
82
Issue
5
Language
en
Type
Article
This Version
VoR
Metadata
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Clayton, H., Sievert, M. D., & Horowitz, W. (2022). Jet broadening in the opacity and twist expansions. The European Physical Journal C, 82 (5) https://doi.org/10.1140/epjc/s10052-022-10386-x
Description
Funder: South African National Research Foundation
Abstract
Abstract: We compute the in-medium jet broadening ⟨p⊥2⟩ to leading order in energy in the opacity expansion. At leading order in αs the elastic energy loss gives a jet broadening that grows with lnE. The next-to-leading order in αs result is a jet narrowing, due to destructive LPM interference effects, that grows with ln2E. We find that in the opacity expansion the jet broadening asymptotics are – unlike for the mean energy loss – extremely sensitive to the correct treatment of the finite kinematics of the problem; integrating over all emitted gluon transverse momenta leads to a prediction of jet broadening rather than narrowing. We compare the asymptotics from the opacity expansion to a recent twist-4 derivation of ⟨p⊥2⟩ and find a qualitative disagreement: the twist-4 derivation predicts a jet broadening rather than a narrowing. Comparison with current jet measurements cannot distinguish between the broadening or narrowing predictions. We comment on the origin of the difference between the opacity expansion and twist-4 results.
Keywords
Regular Article - Theoretical Physics
Identifiers
s10052-022-10386-x, 10386
External DOI: https://doi.org/10.1140/epjc/s10052-022-10386-x
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337132
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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