Event-by-event hydrodynamics $+$ jet energy loss: A solution to the $R_{AA} \otimes v_2$ puzzle
| Autor: | Noronha-Hostler, Jacquelyn, Betz, Barbara, Noronha, Jorge, Gyulassy, Miklos |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 116, 252301 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.252301 |
| Popis: | 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 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 $p_T$ $v_2$ 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 $p_T$ $R_{AA} \otimes v_2$ 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. Comment: 7 pages, 3 figures, references added, substantially revised, accepted for publication in Phys. Rev. Lett |
| Databáze: | arXiv |
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