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Title: Predictions for boson-jet observables and fragmentation function ratios from a hybrid strong/weak coupling model for jet quenching

We have previously introduced a hybrid strong/weak coupling model for jet quenching in heavy ion collisions in which we describe the production and fragmentation of jets at weak coupling, using Pythia, and describe the rate at which each parton in the jet shower loses energy as it propagates through the strongly coupled plasma, dE/dx, using an expression computed holographically at strong coupling. The model has a single free parameter that we fit to a single experimental measurement. We then confront our model with experimental data on many other jet observables, focusing in this paper on boson-jet observables, finding that it provides a good description of present jet data. Next, we provide the predictions of our hybrid model for many measurements to come, including those for inclusive jet, dijet, photon-jet and Z-jet observables in heavy ion collisions with energy √s = 5 : 02 ATeV coming soon at the LHC. As the statistical uncertainties on near-future measurements of photon-jet observables are expected to be much smaller than those in present data, with about an order of magnitude more photon-jet events expected, predictions for these observables are particularly important. We find that most of our pre- and post-dictions do not depend sensitivelymore » on the form we choose for the rate of energy loss dE/dx of the partons in the shower. This gives our predictions considerable robustness. To better discriminate between possible forms for the rate of energy loss, though, we must turn to intrajet observables. Here, we focus on ratios of fragmentation functions. Finally, we close with a suggestion for a particular ratio, between the fragmentation functions of inclusive and associated jets with the same kinematics in the same collisions, which is particularly sensitive to the x- and E-dependence of dE/dx, and hence may be used to learn which mechanism of parton energy loss best describes the quenching of jets.« less
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4]
  1. Univ. of Barcelona (Spain). Dept. of Structure and Constituents of Matter. Inst. of Sciences of the Cosmos (ICCUB)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics. Lab. for Nuclear Science
  3. Univ. of Lisbon (Portugal).Multidisciplinary Centre for Astrophysics (CENTRA). Superior Technical Inst.; European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Unit. Physics Dept.
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics. Lab. for Nuclear Science. Center for Theoretical Physics
Publication Date:
OSTI Identifier:
1326993
Grant/Contract Number:
SC0011088; SC0011090; FP7-PEOPLE-2012-GIG-333786; FPA2013-46570; FPA2013-40360-ERC; MDM-2014-0369; 2014-SGR-104; CERN/FP/123596/2011
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 3; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Barcelona (Spain); Univ. of Lisbon (Portugal); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Sponsoring Org:
USDOE; European Commission (EC); Ministry of Economy and Competitiveness (Spain); Government of Catalonia; Foundation for Science and Technology (FCT) (Portugal)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; heavy ion phenomenology; jets