title: Event-by-Event Hydrodynamics+Jet Energy Loss: A Solution to the R_{AA}⊗v_{2} Puzzle.
abstract: High p_{T}>10  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-p_{T} elliptic flow and event-plane angle fluctuations in the soft sector. In this Letter, 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-p_{T} v_{2} fluctuations overwhelms the negative contributions from event-plane fluctuations. This leads to an enhancement of high-p_{T}>10  GeV elliptic flow in comparison to previous calculations and provides a natural solution to the decade-long high-p_{T} R_{AA}⊗v_{2} puzzle. We also present the first theoretical calculation of high-p_{T} v_{3}, 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.
authors.affiliation: Department of Physics, University of Houston, Houston, Texas 77204, USA.
authors.forename: Jacquelyn
authors.initials: J
authors.lastname: Noronha-Hostler
authors.affiliation: Institute for Theoretical Physics, Goethe University, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany.
authors.forename: Barbara
authors.initials: B
authors.lastname: Betz
authors.affiliation: Instituto de Física, Universidade de Sáo Paulo, C.P. 66318, 05315-970 São Paulo, SP, Brazil.
authors.forename: Jorge
authors.initials: J
authors.lastname: Noronha
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.|Department of Physics, Pupin Lab MS-5202, Columbia University, New York, New York 10027, USA.|Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China.
authors.forename: Miklos
authors.initials: M
authors.lastname: Gyulassy