Abstract
Event-Shape Engineering (ESE) is a tool that enables some control of the initial geometry in heavy-ion collisions in a similar way as the centrality enables some control of the number of participants. Utilizing ESE, the path length in and out-of plane can be varied while keeping the medium properties (centrality) fixed. In this proceeding it is argued that this provides additional experimental information about jet quenching. Finally, it is suggested that if ESE studies are done in parallel for light and heavy quarks one can determine, in a model independent way, if the path-length dependence of their quenching differs.
Highlights
Jet quenching offers a possibility to determine properties of the QGP but it requires that the energy loss mechanism and the effects of the expanding medium are under control
Results from the LHC have demonstrated that by going to high pT, pT > 10 GeV/c, the pT spectra are dominated by jets and so one avoids complicated overlap effects with soft and intermediate pT physics processes. In approximately this pT region, PHENIX has shown [1] that energy-loss models in general fails at describing both the nuclear modification factor, RAA, and the elliptic-flow coefficient, v2
The RAA,in and RAA,out have proven to be difficult observables to describe for jet-quenching models. By doing these measurements as a function of the eccentricity one constrains the underlying geometry in a way that simplifies the direct interpretation of the results and that allows further tests of models
Summary
1. Introduction Jet quenching offers a possibility to determine properties of the QGP but it requires that the energy loss mechanism and the effects of the expanding medium are under control. In approximately this pT region, PHENIX has shown [1] that energy-loss models in general fails at describing both the nuclear modification factor, RAA, and the elliptic-flow coefficient, v2 (at high pT, v2 is expected to be entirely due to jet quenching reflecting the azimuthal asymmetry of the path length).
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