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

19-24 May 2014
Europe/Zurich timezone

## Neutral meson measurement via photon conversions in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with ALICE at the LHC

20 May 2014, 16:30
2h

Board: E-24
Poster Jets

### Speaker

Annika Passfeld (Westfaelische Wilhelms-Universitaet Muenster (DE))

### Description

The measurement of particle production in p-Pb collisions at high LHC energies allows the study of fundamental properties of quantum chromodynamics (QCD) at low parton momentum fraction $x$ and high gluon densities. Moreover it is important as reference for heavy ion collisions. It can show whether the initial state of the colliding nuclei plays a role in the observed suppression of hadron production at high $p_{\rm T}$ in Pb-Pb collisions. The measurement of neutral pions has the advantage of large statistics of identified particles over a relatively large transverse momentum range. In addition, the neutral pion measurement is crucial for the background determination for other analyses like the direct photon measurement. With the ALICE setup it is possible to measure neutral pions with different methods: via its two photon decay channel using calorimeters or photon conversions or via its Dalitz decay channel. This poster will show the results of the $\pi^{0} \rightarrow \gamma \gamma$ and $\eta \rightarrow \gamma \gamma$ analysis using photon conversions. Differential invariant cross sections for minimum bias collisions and for different charged particle multiplicities will be presented for both mesons as well as $R_{\rm pPb}$ for the neutral pions.
On behalf of collaboration: ALICE

### Primary author

Annika Passfeld (Westfaelische Wilhelms-Universitaet Muenster (DE))

 Slides