Event-by-Event Hydrodynamics+Jet Energy Loss: A Solution to the RAA - V2 Puzzle

Jacquelyn Noronha-Hostler, Barbara Betz, Jorge Noronha, Miklos Gyulassy

Research output: Contribution to journalArticlepeer-review


High pT>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-pT 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-pT v2 fluctuations overwhelms the negative contributions from event-plane fluctuations. This leads to an enhancement of high-pT>10 GeV elliptic flow in comparison to previous calculations and provides a natural solution to the decade-long high-pT RAA - v2 puzzle. We also present the first theoretical calculation of high-pT v3, 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.

Original languageEnglish (US)
Article number252301
JournalPhysical review letters
Issue number25
StatePublished - Jun 21 2016
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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