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Title: A theory of jet shapes and cross sections: from hadrons to nuclei

A theory of jet shapes and cross sections: from hadrons to nuclei For jets, with great power comes great opportunity. The unprecedented center of mass energies available at the LHC open new windows on the QGP: we demonstrate that jet shape and jet cross section measurements become feasible as a new, differential and accurate test of the underlying QCD theory. We present a first step in understanding these shapes and cross sections in heavy ion reactions. Our approach allows for detailed simulations of the experimental acceptance/cuts that help isolate jets in such high-multiplicity environment. It is demonstrated for the first time that the pattern of stimulated gluon emission can be correlated with a variable quenching of the jet rates and provide an approximately model-independent approach to determining the characteristics of the medium-induced bremsstrahlung spectrum. Surprisingly, in realistic simulations of parton propagation through the QGP we find a minimal increase in the mean jet radius even for large jet attenuation. Jet broadening is manifest in the tails of the energy distribution away from the jet axis and its quantification requires high statistics measurements that will be possible at the LHC.
Authors: ; ;
Publication Date:
OSTI Identifier:OSTI ID: 960520
Report Number(s):LA-UR-08-06010; LA-UR-08-6010
TRN: US1002055
DOE Contract Number:AC52-06NA25396
Resource Type:Journal Article
Resource Relation:Journal Name: Physical Review D or Journal of High Energy Physics
Research Org:Los Alamos National Laboratory (LANL)
Sponsoring Org:DOE
Country of Publication:United States
Language:English
Subject: 72; ATTENUATION; BREMSSTRAHLUNG; CROSS SECTIONS; EMISSION; ENERGY SPECTRA; GLUONS; HADRONS; JET MODEL; HEAVY ION REACTIONS; MASS; NUCLEI; POWER; QUANTUM CHROMODYNAMICS; QUENCHING; SHAPE; STATISTICS