• DOI:10.1007/JHEP02(2016)169
• Corpus ID: 118372057

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

@article{Xu2015BridgingST,
  title={Bridging soft-hard transport properties of quark-gluon plasmas with CUJET3.0},
  author={Jiechen Xu and Jinfeng Liao and Miklos Gyulassy},
  journal={Journal of High Energy Physics},
  year={2015},
  volume={2016},
  pages={1-50}
}

• Jiechen Xu, J. Liao, M. Gyulassy
• Published 3 August 2015
• Physics
• Journal of High Energy Physics

A bstractA 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, RAAh (pT > 10GeV=c;s$$ \sqrt{s} $$), and their azimuthal elliptic asymmetry v2h (pT > 10GeV=c;s$$ \sqrt{s} $$) with available data on h =π, D;B jet fragments from nuclear collisions at RHIC (s=0.2$$ \sqrt{s} = 0.2 $$ ATeV) and LHC(s=2.76$$ \sqrt{s}=2.76 $$ ATeV). The cmm degrees of freedom in the sQGMP model near Tc are shown to solve robustly the long standing RAA vs v2 puzzle by predicting a maximum of the jet quenching parameter field ĝ(E; T)/T3 near Tc. 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 q^$$ \widehat{q} $$ down to thermal energy E ~ 3T scales and showing that the sQGMP shear viscosity to entropy density ratio η/s≈T3/q^$$ \eta /s\approx {T}^3/\widehat{q} $$ falls close to the unitarity bound, 1/4π$$ \pi $$, in the range (1–2)Tc. Detailed comparisons of the CUJET2.0 and CUJET3.0 models reveal the fact that remarkably different q^T$$ \widehat{q}(T) $$ dependence could be consistent with the same RAA data and could only be distinguished by anisotropy observables. These _ndings demonstrate clearly the inadequacy of focusing on the jet path averaged quantity q^$$ \left\langle \widehat{q}\right\rangle $$ as the only relevant medium property to characterize jet quenching, and point to the crucial roles of other essential factors beyond just the q^$$ \left\langle \widehat{q}\right\rangle $$, 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.