Probing medium-induced jet splitting and energy loss in heavy-ion collisions

The nuclear modification of jet splitting in relativistic heavy-ion collisions at RHIC and the LHC energies is studied based on the higher twist formalism. Assuming coherent energy loss for the two splitted subjets, a non-monotonic jet energy dependence is found for the nuclear modification of jet s...

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Bibliographic Details
Published in:arXiv.org 2017-07
Main Authors: Ning-Bo, Chang, Cao, Shanshan, Guang-You Qin
Format: Article
Language:English
Subjects:
Dependence
Energy dissipation
Ionic collisions
Large Hadron Collider
Solenoids
Splitting
Online Access:Get full text
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Summary:The nuclear modification of jet splitting in relativistic heavy-ion collisions at RHIC and the LHC energies is studied based on the higher twist formalism. Assuming coherent energy loss for the two splitted subjets, a non-monotonic jet energy dependence is found for the nuclear modification of jet splitting function: strongest modification at intermediate jet energies whereas weaker modification for larger or smaller jet energies. Combined with the smaller size and lower density of the QGP medium at RHIC than at the LHC, this explains the CMS-STAR groomed jet puzzle -- strong nuclear modification of the momentum sharing \(z_g\) distribution at the LHC whereas no obvious modification of the \(z_g\) distribution at RHIC. In contrast, the observed nuclear modification pattern of the groomed jet \(z_g\) distribution cannot be explained solely by independent energy loss of the two subjets. Our result may be tested in future measurements of groomed jets with lower jet energies at the LHC and larger jet energies at RHIC, for different angular separations between the two subjets.
ISSN:2331-8422
DOI:10.48550/arxiv.1707.03767