# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
darmstadtium
Europe/Zurich timezone

## Centrality dependence of particle production in p-A collisions measured by ALICE

19 May 2014, 16:50
20m
titanium (darmstadtium)

### titanium

#### darmstadtium

Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Initial State Physics

### Speaker

Dr Alberica Toia (Johann-Wolfgang-Goethe Univ. (DE))

### Description

Measurements of particle production in proton-nucleus collisions provide a reference to disentangle final state effects, i.e. signatures of the formation of a deconfined hot medium, from initial state effects, already present in cold nuclear matter. While most of the benchmarks from the control experiment indicate that initial state effects do not play a role in the observed suppression of hadron production observed in heavy ion collisions, several measurements of particle production in the low and intermediate $p_{\rm T}$ region indicate the presence of collective effects. Since many initial state effects are expected to vary as a function of the number of collisions suffered by the incoming projectile, it is crucial to estimate event-by-event the centrality of the collision. We present the centrality dependence of particle production in p-A collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV measured by the ALICE experiment, including the pseudo-rapidity and transverse momentum spectra, with a special emphasis on the event classification in centrality classes and its implications in the interpretation of the nuclear effects.
On behalf of collaboration: ALICE

### Primary author

Dr Alberica Toia (Johann-Wolfgang-Goethe Univ. (DE))

 Slides