6533b7d7fe1ef96bd12690bd
RESEARCH PRODUCT
Event-by-event picture for the medium-induced jet evolution
Miguel A. EscobedoMiguel A. EscobedoEdmond Iancusubject
heavy ion: scatteringNuclear Theoryn-point functionHigh Energy Physics::LatticeNuclear TheoryPartonJet (particle physics)gluon: multiplicity01 natural sciencesHigh Energy Physics - Phenomenology (hep-ph)scaling: KNONuclear Experiment[ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th]quark gluon: plasmamedia_commonQuantum chromodynamicsPhysicsPhysicsgluon: productionPerturbative QCDmatter: effectjet: asymmetrycascadeHigh Energy Physics - PhenomenologyCERN LHC CollNuclear and High Energy PhysicsParticle physics[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]media_common.quotation_subjectQC1-999energy lossFOS: Physical sciencesjet: correlationformulaAsymmetryNuclear physicsNuclear Theory (nucl-th)gluon: spectrum0103 physical sciencesquantum chromodynamicsstochasticquantum chromodynamics: perturbation theory010306 general physicsScalingBranching processquantum chromodynamics: matterta114010308 nuclear & particles physicsgluon: fluctuationHigh Energy Physics::Phenomenologydijet: asymmetrygluon distributionGluonjet: energy losscorrelation[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Quark–gluon plasma[ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph]gluon: radiationHigh Energy Physics::Experimentjet: quenchingEvent (particle physics)jet evolutiondescription
We discuss the evolution of an energetic jet which propagates through a dense quark-gluon plasma and radiates gluons due to its interactions with the medium. Within perturbative QCD, this evolution can be described as a stochastic branching process, that we have managed to solve exactly. We present exact, analytic, results for the gluon spectrum (the average gluon distribution) and for the higher n-point functions, which describe correlations and fluctuations. Using these results, we construct the event-by-event picture of the gluon distribution produced via medium-induced gluon branching. In contrast to what happens in a usual QCD cascade in vacuum, the medium-induced branchings are quasi-democratic, with offspring gluons carrying sizable fractions of the energy of their parent parton. We find large fluctuations in the energy loss and in the multiplicity of soft gluons. The multiplicity distribution is predicted to exhibit KNO (Koba-Nielsen-Olesen) scaling. These predictions can be tested in Pb+Pb collisions at the LHC, via event-by-event measurements of the di-jet asymmetry. Based on JHEP 1605 (2016) 008 and arXiv:1609.06104
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-08-28 |