Bridging soft-hard transport properties of quark-gluon plasmas with CUJET3.0

2015/08/31 by Jiechen Xu, Jinfeng Liao, Miklos Gyulassy +1 · 2 citations
Physics and Astronomy · #Gluon #Hadron #High-Energy Particle Collisions Research #Inverse #Jet quenching #Magnetic monopole #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Perturbative QCD #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Quark–gluon plasma #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1007/jhep02(2016)169

published as JHEP 1602 (2016) 169 · 50 pages, 14 figures; v3: typos corrected, new references and discussions included; published in JHEP

openalex publication_date 2016/02/01 · arxiv created 2016/03/12 · arxiv updated 2016/03/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

A new model (CUJET3.0) of jet quenching in nuclear collisions coupled to bulk data constrained (VISH2+1D) viscous hydrodynamic backgrounds is constructed by generalizing the perturbative QCD based (CUJET2.0) model to include two complementary non-perturbative chromodynamical features of the QCD con_nement cross-over phase transition near Tc ≈ 160 MeV: (1) the suppression of quark and gluon chromo-electric-charged (cec) degrees of freedom and (2) the emergence of chromo-magnetic-monopole (cmm) degrees of freedom. Such a semi Quark Gluon Monopole Plasma (sQGMP) microscopic scenario is tested by comparing predictions of the leading hadron nuclear modification factors, R (pT > 10GeV=c; √(s) ), and their azimuthal elliptic asymmetry v 2 (pT > 10GeV=c; √(s) ) with available data on h =π, D;B jet fragments from nuclear collisions at RHIC ( √(s) = 0.2 ATeV) and LHC( √(s)=2.76 ATeV). The cmm degrees of freedom in the sQGMP model near T c are shown to solve robustly the long standing R AA vs v 2 puzzle by predicting a maximum of the jet quenching parameter field ĝ(E; T)/T 3 near T c . The robustness of CUJET3.0 model to a number of theoretical uncertainties is critically tested. Moreover the consistency of jet quenching with observed bulk perfect uidity is demonstrated by extrapolating the sQGMP \widehatq down to thermal energy E ~ 3T scales and showing that the sQGMP shear viscosity to entropy density ratio η /s≈ T³/\widehatq falls close to the unitarity bound, 1/4 π , in the range (1–2)Tc. Detailed comparisons of the CUJET2.0 and CUJET3.0 models reveal the fact that remarkably different \widehatq(T) dependence could be consistent with the same R AA data and could only be distinguished by anisotropy observables. These _ndings demonstrate clearly the inadequacy of focusing on the jet path averaged quantity ⟨ \widehatq⟩ as the only relevant medium property to characterize jet quenching, and point to the crucial roles of other essential factors beyond just the ⟨ \widehatq⟩ , such as the chromo electric and magnetic composition of the plasma, the screening masses and the running couplings at multiple scales which all strongly influence jet energy loss.

Citations

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• JET QUENCHING AND RADIATIVE ENERGY LOSS IN DENSE NUCLEAR MATTER
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• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Gluon Radiation off Hard Quarks in a Nuclear Environment: Opacity Expansion
• Quantised singularities in the electromagnetic field,
• Midrapidity Neutral-Pion Production in Proton-Proton Collisions ats=200 GeV
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• Effective theory of Wilson lines and deconfinement
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• Jet Quenching and Its Azimuthal Anisotropy in AA and possibly High Multiplicity pA and dA Collisions
• Comparison of jet quenching formalisms for a quark-gluon plasma “brick”
• Jet modification in three dimensional fluid dynamics at next-to-leading twist

Cited by

• Nuclear modification of leading hadrons and jets within a virtuality ordered parton shower
• Studies of Strange and Non-Strange Beauty Productions in PbPb Collisions with the CMS Detector