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24 April 2024 |
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Article overview
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Robustness and Consistency of Jet Quenching and Perfect Fluidity in semi Quark Gluon Monopole Plasmas (sQGMP) Produced at RHIC and LHC | | Jiechen Xu
; Jinfeng Liao
; Miklos Gyulassy
; | | Date: |
3 Aug 2015 | | 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 possible
non-perturbative chromodynamical features of the QCD confinement transition
near $T_capprox 160$ MeV. Two competing mechanisms are considered: (1) the
suppression of quark and gluon chromo-electric-charged (cec) degrees of freedom
(aka the semi-QGP model of Pisarski et al) and (2) the emergence of
chromo-magnetic-monopole (cmm) degrees of freedom (aka the magnetic scenario of
Shuryak-Liao). This semi Quark Gluon Monopole Plasma (sQGMP) model depends on
two free parameters: (1) the saturating value of the QCD running coupling
$alpha_c$ below $T_c$ and (2) the ratio $c_m$ of color electric to magnetic
screening scales. The value of $alpha_c$ is fixed by fitting to a $single$ LHC
reference datum, $R^{ch}_{PbPb}(p_T=12{
m GeV/c})approx 0.3$ for 20-30%
centrality. Consistency is then tested by comparing predictions to $all$
$R^h_{AA}(p_T>10{
m GeV/c})$, $v^h_2(p_T>10{
m GeV/c})$, $h=pi,D,B$ data
simultaneously at both RHIC and LHC. Robustness to uncertainties in modeling
the suppression of cec degrees of freedom is tested by comparing results based
on lattice data for Polyakov loop versus for quark susceptibility. The emergent
cmm degrees of freedom are shown to solve robustly the long standing $R_{AA}$
vs $v_2$ puzzle by predicting a maximum of the jet quenching parameter field
$hat{q}(E,T)/T^3$ near $T_c$. Robustness and consistency of jet quenching with
observed bulk perfect fluidity is demonstrated by extrapolating the sQGMP
$hat{q}$ down to thermal energy $Esim 3 T$ scales and showing that the
$eta/s approx T^3/hat{q}$ falls close to the unitarity bound, $1/4pi$, in
the range $(1-2)T_c$. | | Source: | arXiv, 1508.0552 | | Services: | Forum | Review | PDF | Favorites | |
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