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2017

Absence of jet quenching in peripheral nucleus-nucleus collisions

Loizides, Constantin, Morsch, Andreas

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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.

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X. Zhang and J. Liao, “Jet quenching and its azimuthal anisotropy in AA and possibly high multiplicity pA and dA collisions,” arXiv:1311.5463 [nucl-th]

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