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Nuclear Theory

arXiv:1602.03788 (nucl-th)
[Submitted on 11 Feb 2016 (v1), last revised 12 Jun 2016 (this version, v2)]

Title:Event-by-event hydrodynamics $+$ jet energy loss: A solution to the $R_{AA} \otimes v_2$ puzzle

Authors:Jacquelyn Noronha-Hostler (Houston U.), Barbara Betz (Frankfurt U.), Jorge Noronha (Sao Paulo U.), Miklos Gyulassy (LBNL, NSD and Columbia U. and CCNU, Wuhan, Inst. Part. Phys.)
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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 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.
Comments: 7 pages, 3 figures, references added, substantially revised, accepted for publication in Phys. Rev. Lett
Subjects: Nuclear Theory (nucl-th); High Energy Physics - Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
Cite as: arXiv:1602.03788 [nucl-th]
  (or arXiv:1602.03788v2 [nucl-th] for this version)
  https://doi.org/10.48550/arXiv.1602.03788
Journal reference: Phys. Rev. Lett. 116, 252301 (2016)
Related DOI: https://doi.org/10.1103/PhysRevLett.116.252301

Submission history

From: Jorge Noronha [view email]
[v1] Thu, 11 Feb 2016 16:44:32 UTC (527 KB)
[v2] Sun, 12 Jun 2016 22:32:40 UTC (191 KB)
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