Abstract
The current status of coherent energy loss is reviewed, both in theory and in its phenomenological applications to p-A collisions.
Highlights
The nuclear suppression of hadron production in proton-nucleus (p–A) with respect to proton-proton (p–p) collisions has been widely discussed, but is still an open question due to the presence of various competing effects, depending on the precise kinematics and collision energy
Medium-induced coherent gluon radiation is a QCD prediction which has been obtained in various theoretical setups [1,2,3,4,5,6,7], and was successfully applied to the phenomenology of quarkonium nuclear suppression in p–A collisions [2, 8, 9]
2 Theory of induced energy loss: a brief history. It was first noted by Gavin and Milana [10] that the strong increase of J/ψ suppression with xF observed in p–A collisions could be reproduced by assuming an induced parton energy loss ΔE scaling as the energy E of the energetic ccpair, namely ΔE ∝ E
Summary
The nuclear suppression of hadron production in proton-nucleus (p–A) with respect to proton-proton (p–p) collisions has been widely discussed, but is still an open question due to the presence of various competing effects, depending on the precise kinematics and collision energy. Most of the phenomenological approaches assumed hadron nuclear suppression to be due either to hadron nuclear absorption or to the shadowing of the gluon distribution in the target nucleus expected at small x2 10−2. Another fundamental phenomenon, namely coherent parton energy loss in cold nuclear matter, could play a decisive role in hadron nuclear suppression [1]. 2) and in its phenomenological applications to p–A collisions We review the current status of coherent energy loss in theory (Sect. 2) and in its phenomenological applications to p–A collisions (Sect. 3)
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