Event-by-event hydrodynamics $+$ jet energy loss: A solution to the $R_{AA} \otimes v_2$ puzzle
Abstract
High GeV elliptic flow, which is experimentally measured via the correlation between soft and hard hadrons, receives competing contributions from event-by-event fluctuations of the low elliptic flow and event plane angle fluctuations in the soft sector. In this paper, a proper account of these event-by-event fluctuations in the soft sector, modeled via viscous hydrodynamics, is combined with a jet energy loss model to reveal that the positive contribution from low fluctuations overwhelms the negative contributions from event plane fluctuations. This leads to an enhancement of high GeV elliptic flow in comparison to previous calculations and provides a natural solution to the decade long high puzzle. We also present the first theoretical calculation of high , which is shown to be compatible with current LHC data. Furthermore, we discuss how short wavelength jet-medium physics can be deconvoluted from the physics of soft, bulk event-by-event flow observables using event shape engineering techniques.
Keywords
Cite
@article{arxiv.1602.03788,
title = {Event-by-event hydrodynamics $+$ jet energy loss: A solution to the $R_{AA} \otimes v_2$ puzzle},
author = {Jacquelyn Noronha-Hostler and Barbara Betz and Jorge Noronha and Miklos Gyulassy},
journal= {arXiv preprint arXiv:1602.03788},
year = {2016}
}
Comments
7 pages, 3 figures, references added, substantially revised, accepted for publication in Phys. Rev. Lett