Consistency of Perfect Fluidity and Jet Quenching in Semi-Quark-Gluon Monopole Plasmas

Abstract

We utilize a new framework, CUJET3.0, to deduce the energy and temperature dependence of jet transport parameter,q(E > 10 GeV, T ), from a combined analysis of available data on nuclear modification factor and azimuthal asymmetries from RHIC/BNL and LHC/CERN on high energy nuclear collisions. Extending a previous perturbative-QCD based jet energy loss model (known as CUJET2.0) with (2+1)D viscous hydrodynamic bulk evolution, this new framework includes three novel features of nonperturbative physics origin: (1) the Polyakov loop suppression of colorelectric scattering (aka "semi-QGP" of Pisarski et al) and (2) the enhancement of jet scattering due to emergent magnetic monopoles near Tc (aka "magnetic scenario" of Liao and Shuryak) and (3) thermodynamic properties constrained by lattice QCD data. CUJET3.0 reduces to v2.0 at high temperatures T > 400 MeV, but greatly enhancesq near the QCD deconfinement transition temperature range. This enhancement accounts well for the observed elliptic harmonics of jets with pT > 10 GeV. Extrapolating our data-constrainedq down to thermal energy scales, E ∼ 2 GeV, we find for the first time a remarkable consistency between high energy jet quenching and bulk perfect fluidity with η/s ∼ T 3 /q ∼ 0.1 near Tc. [10][11][12][13][14][15] 21]. Interestingly by comparing RHIC and LHC measurements it was found that both QGP properties vary with beam energy with extracted average η/s increasing whileq/T 3 decreasing (by ∼ 30%) from RHIC to LHC [7][8][9][10][17][18][19]. These observations indicate a relatively strong temperature dependence of such medium properties in the 1 ∼ 3 T c region.Up to now however has been no quantitative and consistent microscopic understanding of both bulk collectivity and jet quenching in QGP. Perturbative-QCD (pQCD) based models forq(E, T ) that account for jet quenching at high energies are found to be inconsistent with small η/s ∼ T 3 /q when extrapolated down to thermal energy scales [6]. On the other hand, strong coupling models that can easily account for η/s ∼ 1/4π perfect fluidity tend to over-predict quenching of high energy jets when extrapolated to high energies [20, 21]. None of these models show strong T-dependence for η/s orq/T 3 . In this Letter, we address these questions by taking into account three important nonperturbative properties of QGP suggested by lattice QCD calculations into a new microscopic model of semi-quark-gluon monopole plasmas (sQGMP) in the crossover QCD transition tem-

Temperature dependent transport coefficients in a dynamical holographic QCD model

“…It's quite convenient to use the holographic method based on the AdS/CFT correspondence to study the dynamical properties, while Lattice calculation in this area still suffer large uncertainty. Within holographic framework, our previous work [65] do show that near the transition point there would be nontrivial enhancement ofq/T 3 , which is closely related to the phase transition and is consistent with the phenomenological studies in [66][67][68].…”

“…The location of valley is almost same as the location of the peak position inq/T 3 and the peak of the trace anomaly as well as the peak of the bulk viscosity. This opposite trends of η/s andq/T 3 near T c is also observed in phenomenological study [68].…”

Event-by-EventHydrodynamics+JetEnergy Loss: A Solution to theRAA⊗vNoronha-Hostler1, Betz2, Noronha3 et al. 2016Phys. Rev. Lett.Self Cite11661573View full textAdd to dashboardCite

“…[36,37]) to obtain a simultaneous description of R AA (p T ) and high p T elliptic flow. Model calculations typically give a small v hard 2 (p T ) that is incompatible with elliptic flow data.…”

Constraints on the Jet-Medium Coupling from Measurements at RHIC and LHC

“…This effect has been discussed in literature [5,12,13] and recently it has been suggested by CUJET3.0 [14] that a temperature and energydependent jet-medium coupling κ = κ(E 2 , T ), which includes non-perturbative effects around the phase transition of T c ∼ 160 MeV, can overcome this problem.…”

“…R AA and v 2 requires a jet-medium coupling that depends on the energy of the jet, the temperature of the medium [5,14], and non-equilibrium effects around the phase transition. We also contrasted a hydrodynamic background (VISH2+1) [6] with a medium obtained from the parton cascade BAMPS [7] and showed that the influence of the underlying bulk medium considered is suprisingly small.…”