Abstract
Scaling of charged particle production and centrality determination in p-Pb collisions at √<i>s</i><sub>NN</sub>= 5.02 TeV at ALICE
Highlights
Proton–lead collisions are an essential component of the heavy ion programme at LHC
Several measurements [1]-[4] clearly indicate that p-Pb collisions can not be explained as a simple incoherent superposition of proton-nucleon collisions, but rather indicate the onset of collective effects with a strong collision geometry dependence
To determine the relation between a measured observable and the collision geometry, typically defined through the number of participating nucleons Npart or the number of binary collisions Ncoll, usually a Glauber model is used in combination with a model that accounts for particle production
Summary
Proton–lead collisions are an essential component of the heavy ion programme at LHC. These collisions are needed as a baseline in the understanding of cold nuclear matter effects and in the interpretation of the nucleus-nucleus data. The study of key observables as a function of centrality poses a crucial focus on the centrality determination. One of the main observables used to study p-A collisions is the nuclear modification factor: RpA. The RpA compares the yield in p-Pb to the yield in p–p scaled by the average number of binaries proton-nucleon collisions in centrality selected samples. For the analysis as a function of centrality, the details of centrality determination procedure becomes crucial
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