The Surprising Transparency of the sQGP at LHC - INSPIRE

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The Surprising Transparency of the sQGP at LHC

W.A. Horowitz
(
- Cape Town U.
)
,
Miklos Gyulassy
(
- Columbia U.
)

Apr, 2011

13 pages

Published in:

Nucl.Phys.A 872 (2011) 265-285

e-Print:

1104.4958 [hep-ph]

DOI:

10.1016/j.nuclphysa.2011.09.018

View in:

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Abstract: (Elsevier)

We present parameter-free predictions of the nuclear modification factor, R A A π ( p T , s ) , of high p T pions produced in Pb + Pb collisions at s N N = 2.76 and 5.5 ATeV based on the WHDG/DGLV (radiative + elastic + geometric fluctuation) jet energy loss model. The initial quark gluon plasma (QGP) density at LHC is constrained from a rigorous statistical analysis of PHENIX/RHIC π 0 quenching data at s N N = 0.2 ATeV and the charged particle multiplicity at ALICE/LHC at 2.76 ATeV. Our perturbative QCD tomographic theory predicts significant differences between jet quenching at RHIC and LHC energies, which are qualitatively consistent with the p T -dependence and normalization—within the large systematic uncertainty—of the first charged hadron nuclear modification factor, R A A c h , data measured by ALICE. However, our constrained prediction of the central to peripheral pion modification, R c p π ( p T ) , for which large systematic uncertainties associated with unmeasured p + p reference data cancel, is found to be over-quenched relative to the charged hadron ALICE R c p c h data in the range 5 < p T < 20 GeV / c . The discrepancy challenges the two most basic jet tomographic assumptions: (1) that the energy loss scales linearly with the initial local comoving QGP density, ρ 0 , and (2) that ρ 0 ∝ d N c h ( s , C ) / d y is proportional to the observed global charged particle multiplicity per unit rapidity as a function of s and centrality class, C . Future LHC identified ( h = π , K , p ) hadron R A A h data (together with precise p + p, p + Pb, and Z boson and direct photon Pb + Pb control data) are needed to assess if the QGP produced at LHC is indeed less opaque to jets than predicted by constrained extrapolations from RHIC.

Note:

13 pages, 8 figures

24.85.+p
25.75.-q
12.38.Mh
QCD
Relativistic heavy-ion collisions
Quark gluon plasma
Jet quenching
Jet Tomography
charged particle: multiplicity
jet: energy loss

References(112)

Figures(0)

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