Abstract
We propose a novel definition of a holographic light hadron jet and consider the phenomenological consequences, including the very first fully self-consistent, completely strong-coupling calculation of the jet nuclear modification factor R AA , which we find compares surprisingly well with recent preliminary data from LHC. We show that the thermalization distance for light parton jets is an extremely sensitive function of the a priori unspecified string initial conditions and that worldsheets corresponding to non-asymptotic energy jets are not well approximated by a collection of null geodesics. Our new string jet prescription, which is defined by a separation of scales from plasma to jet, leads to the re-emergence of the late-time Bragg peak in the instantaneous jet energy loss rate; unlike heavy quarks, the energy loss rate is unusually sensitive to the very definition of the string theory object itself. A straightforward application of the new jet definition leads to significant jet quenching, even in the absence of plasma. By renormalizing the in-medium suppression by that in the vacuum we find qualitative agreement with preliminary CMS R jet AA (p T ) data in our simple plasma brick model. We close with comments on our results and an outlook on future work.
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Morad, R., Horowitz, W.A. Strong-coupling jet energy loss from AdS/CFT. J. High Energ. Phys. 2014, 17 (2014). https://doi.org/10.1007/JHEP11(2014)017
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DOI: https://doi.org/10.1007/JHEP11(2014)017