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

Journal Article · · Journal of High Energy Physics (Online)
 [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

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 sensitively 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.

Research Organization:
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); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); European Commission (EC); Ministry of Economy and Competitiveness (Spain); Government of Catalonia; Foundation for Science and Technology (FCT) (Portugal)
Grant/Contract Number:
AC02-05CH11231; SC0011088; SC0011090; FP7-PEOPLE-2012-GIG-333786; FPA2013-46570; FPA2013-40360-ERC; MDM-2014-0369; 2014-SGR-104; CERN/FP/123596/2011
OSTI ID:
1326993
Alternate ID(s):
OSTI ID: 1360098; OSTI ID: 1422731
Journal Information:
Journal of High Energy Physics (Online), Vol. 2016, Issue 3; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Jet quenching via jet collimation journal November 2011
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Jet (de)coherence in Pb–Pb collisions at the LHC journal November 2014
Renormalization of the jet-quenching parameter journal November 2014
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Q-PYTHIA: a medium-modified implementation of final state radiation text January 2009
Jet quenching in the strongly-interacting quark-gluon plasma text January 2009
The theory and phenomenology of perturbative QCD based jet quenching text January 2010
Jet quenching in hot strongly coupled gauge theories revisited: 3-point correlators with gauge-gravity duality text January 2010
Antiangular Ordering of Gluon Radiation in QCD Media text January 2010
Jet quenching in hot strongly coupled gauge theories simplified text January 2011
Jets in QCD media: from color coherence to decoherence text January 2011
Jet quenching via jet collimation text January 2011
Coupling dependence of jet quenching in hot strongly-coupled gauge theories text January 2012
The contribution of medium-modified color flow to jet quenching text January 2012
New picture of jet quenching dictated by color coherence text January 2012
Momentum Broadening in Weakly Coupled Quark-Gluon Plasma (with a view to finding the quasiparticles within liquid quark-gluon plasma) text January 2012
Jet physics in heavy-ion collisions text January 2013
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Coherence phenomena between initial and final state radiation in a dense QCD medium text January 2013
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Confronting current NLO parton fragmentation functions with inclusive charged-particle spectra at hadron colliders text January 2013
Effects of Fluid Velocity Gradients on Heavy Quark Energy Loss text January 2013
Geometrical aspects of jet quenching in JEWEL text January 2013
Jet (de)coherence in Pb-Pb collisions at the LHC text January 2014
The non-linear evolution of jet quenching text January 2014
Renormalization of the jet-quenching parameter text January 2014
Jet quenching phenomenology from soft-collinear effective theory with Glauber gluons text January 2014
A Hybrid Strong/Weak Coupling Approach to Jet Quenching text January 2014
Picturing perturbative parton cascades in QCD matter text January 2014
Angular structure of the in-medium QCD cascade text January 2014
The iEBE-VISHNU code package for relativistic heavy-ion collisions preprint January 2014
A semi-holographic model for heavy-ion collisions text January 2014
Thermalization of mini-jets in a quark-gluon plasma text January 2015
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Photon and Gluon Emission in Relativistic Plasmas text January 2002
Matter in extremis: ultrarelativistic nuclear collisions at RHIC text January 2004
Radiative energy loss of high energy quarks and gluons in a finite volume quark-gluon plasma text January 1996
Medium-induced radiative energy loss; equivalence between the BDMPS and Zakharov formalisms text January 1998
Glauber Modeling in High Energy Nuclear Collisions text January 2007

Cited By (8)

Jet overlap in heavy ion collisions at energies available at the CERN Large Hadron Collider and its consequences for the jet shape journal January 2020
Simulating V+jet processes in heavy ion collisions with JEWEL journal December 2016
Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from $pp$ and Pb+Pb Collisions in ATLAS text January 2019
Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at √sNN=5.02 TeV text January 2017
Observation of medium induced modifications of jet fragmentation in PbPb collisions using isolated-photon-tagged jets text January 2018
Jet substructure using semi-inclusive jet functions within SCET text January 2016
Simulating V+jet processes in heavy ion collisions with JEWEL text January 2016
Resolution Effects in the Hybrid Strong/Weak Coupling Model text January 2017

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