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Title: Groomed jets in heavy-ion collisions: sensitivity to medium-induced bremsstrahlung

Here, we argue that contemporary jet substructure techniques might facilitate a more direct measurement of hard medium-induced gluon bremsstrahlung in heavy-ion collisions, and focus specifically on the “soft drop declustering” procedure that singles out the two leading jet substructures. Assuming coherent jet energy loss, we find an enhancement of the distribution of the energy fractions shared by the two substructures at small subjet energy caused by hard medium-induced gluon radiation. Departures from this approximation are discussed, in particular, the effects of colour decoherence and the contamination of the grooming procedure by soft background. Finally, we propose a complementary observable, that is the ratio of the two-pronged probability in Pb-Pb to proton-proton collisions and discuss its sensitivity to various energy loss mechanisms.
Authors:
 [1] ; ORCiD logo [2]
  1. Univ. of Washington, Seattle, WA (United States). Inst. of Nuclear Theory
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland). Dept. of Theoretical Physics
Publication Date:
Grant/Contract Number:
FG02-00ER41132; 655279
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 4; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Org:
USDOE; European Commission (EC)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Heavy Ion Phenomenology; Jets
OSTI Identifier:
1368380