1. Nuclear modification factors for jet fragmentation
- Author
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Gregory Soyez, Paul Caucal, Alfred H. Mueller, Edmond Iancu, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and ANR-16-CE31-0019,DenseQCDatLHC,Etude du régime de haute densité partonique de QCD dans les collisions hadroniques au LHC(2016)
- Subjects
Nuclear and High Energy Physics ,Nuclear Theory ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,Monte Carlo method ,FOS: Physical sciences ,01 natural sciences ,Nuclear Theory (nucl-th) ,Nuclear physics ,High Energy Physics - Phenomenology (hep-ph) ,Fragmentation (mass spectrometry) ,jet: fragmentation ,Jets ,0103 physical sciences ,Fragmentation function ,Cutoff ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,quantum chromodynamics: perturbation theory ,Nuclear Experiment ,010306 general physics ,enhancement ,quark gluon: plasma ,Physics ,Large Hadron Collider ,010308 nuclear & particles physics ,nucleus ,Observable ,Modification factor ,Plasma ,Heavy Ion Phenomenology ,High Energy Physics - Phenomenology ,CERN LHC Coll ,jet: fragmentation function ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,lcsh:QC770-798 ,High Energy Physics::Experiment ,numerical calculations: Monte Carlo - Abstract
Using a recently-developed perturbative-QCD approach for jet evolution in a dense quark-gluon plasma, we study the nuclear modification factor for the jet fragmentation function. The qualitative behaviour that we find is in agreement with the respective experimental observations in Pb+Pb collisions at the LHC: a pronounced nuclear enhancement at both ends of the spectrum. Our Monte Carlo simulations are supplemented with analytic estimates which clarify the physical interpretation of the results. The main source of theoretical uncertainty is the sensitivity of our calculations to a low-momentum cutoff which mimics confinement. To reduce this sensitivity, we propose a new observable, which describes the jet fragmentation into subjets and is infrared-and-collinear safe by construction. We present Monte Carlo predictions for the associated nuclear modification factor together with their physical interpretation., Comment: 37 pages, 11 figures, to appear in JHEP
- Published
- 2020
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