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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Schwerionenkollisionen und QCD Phasen

HK 41.1: Group Report

Thursday, March 20, 2014, 14:00–14:30, HZ 6

p-Pb collisions at the LHC: an overview of ALICE measurements — •Anton Andronic for the ALICE collaboration — Research Division and ExtreMe Matter Institute, GSI Helmholtzzentrum f\"ur Schwerionenforschung, Planckstr. 1, 64291 Darmstadt

A crucial control experiment for the interpretation of deconfined matter studies in high-energy nucleus-nucleus collisions, proton-lead collisions at the LHC led to interesting observations of their own. Currently a hot debate is ongoing whether the measurements are described by initial-state effects related to gluon saturation or if data suggest final state, flow-like, effects akin to those studied in Pb--Pb collisions.

A summary is given of measurements in p--Pb of: i) the nuclear modification factor for inclusive charged particle production, ii) the average transverse momentum correlation with charged-particle multiplicity and iii) two-particle correlations in azimuth and pseudorapidity. The implication of these data for the understanding of the role of initial and final state effects in proton-lead collisions is discussed.