PoS - Proceedings of Science
Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Heavy Ion Physics (Parallel Session). Conveners: Ralf Averbeck; Raphael Granier de Cassagnac; Carlos Salgado. Scientific Secretary: Andrea Dainese.
Jet evolution in a dense medium: event-by-event fluctuations and multi-particle correlations
M.A. Escobedo Espinosa* and E. Iancu
Full text: pdf
Pre-published on: December 01, 2017
Published on: March 20, 2018
Abstract
We study the gluon distribution produced via successive medium-induced branchings by an energetic jet propagating through a weakly-coupled quark-gluon plasma. We show that under suitable approximations, the jet evolution is a Markovian stochastic process, which is exactly solvable. For this process, we construct exact analytic solutions for all the n-point correlation functions describing the gluon distribution in the space of energy. Using these results, we study the event-by-event distribution of the energy lost by the jet at large angles and of the multiplicities of the soft particles which carry this energy. We find that the event-by-event fluctuations are huge: the standard deviation in the energy loss is parametrically as large as its mean value. This has important consequences for the phenomenology of di-jet asymmetry in Pb+Pb collisions at the LHC: it implies that the fluctuations in the branching process can contribute to the measured asymmetry on an equal footing with the geometry of the di-jet event (i.e. as the difference between the in-medium path lengths of the two jets). We compute the higher moments of the multiplicity distribution and identify a remarkable regularity known as Koba-Nielsen-Olesen (KNO) scaling. These predictions could be tested via event-by-event measurements of the di-jet asymmetry.
DOI: https://doi.org/10.22323/1.314.0164
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