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Absence of jet quenching in peripheral nucleus-nucleus collisions
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abstract
Medium effects on the production of high-$p_{\rm T}$ particles in nucleus-nucleus (AA) collisions are generally quantified by the nuclear modification factor ($R_{\rm AA}$), defined to be unity in absence of nuclear effects. Modeling particle production including a nucleon-nucleon impact parameter dependence, we demonstrate that $R_{\rm AA}$ at midrapidity in peripheral AA collisions can be significantly affected by event selection and geometry biases. Even without jet quenching and shadowing, these biases cause an apparent suppression for $R_{\rm AA}$ in peripheral collisions, and are relevant for all types of hard probes and all collision energies. Our studies indicate that calculations of jet quenching in peripheral AA collisions should account for the biases, or else they will overestimate the relevance of parton energy loss. Similarly, expectations of parton energy loss in light-heavy collision systems based on comparison with apparent suppression seen in peripheral $R_{\rm AA}$ should be revised. Our interpretation of the peripheral $R_{\rm AA}$ data would unify observations for lighter collision systems or lower energies where significant values of elliptic flow are observed despite the absence of strong jet quenching.
Forward citations
Cited by 5 Pith papers
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Path-length dependence of parton energy loss across collision systems: a Bayesian analysis of charged-particle RAA, consistent with a universal exponent from O+O to Pb+Pb
A Bayesian fit to O+O, Ne+Ne, Xe+Xe and Pb+Pb charged-particle RAA yields an effective system-size energy-loss exponent n = 1.78 ± 0.15, which the authors interpret as radiative-like; the mechanism claim conflates den...
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System-size dependence of charged-particle suppression in ultrarelativistic nucleus-nucleus collisions
First neon-neon R_AA measurement shows charged-particle suppression increasing monotonically with nuclear size across oxygen, neon, xenon, and lead at LHC energies.
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Geometric Bias and Centrality Dependence of Jet Quenching in High-Energy Nuclear Collisions
Suppression of high-pT hadrons in peripheral Pb+Pb collisions is predominantly driven by initial-state geometric bias rather than final-state jet quenching.
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Energy loss baseline for light hadrons in oxygen-oxygen collisions at $\sqrt{s_\mathrm{NN}}=5.36\,\text{TeV}$
The no-quenching baseline for R_AA in OO collisions at 5.36 TeV is predicted to be under control to about 5% for hadron transverse momenta from 20 to 70 GeV.
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QGP@50: More than Four Decades of Jet Quenching
A historical and technical review of jet quenching in heavy-ion collisions, covering four decades of theory, the RHIC discovery, and modern Bayesian extractions of the jet transport parameter qhat.
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