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

19-24 May 2014
Europe/Zurich timezone

## Study of neutral $\pi$ meson in $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV p-Pb collisions at ALICE

20 May 2014, 16:30
2h

Board: E-22
Poster Jets

### Speaker

Tsubasa Okubo (Hiroshima University (JP))

### Description

Quark-Gluon Plasma (QGP) which is believed to have existed in a very early universe, is a high temperature and dense matter. The ALICE experiment is optimized for heavy-ion collisions and intended to explore the property of QGP. The study of hadron production is essential for the properties of QCD matter. In p-Pb collisions at a high energy region, it enables estimation of the initial state of collisions in the QGP generation. We analyzed minimum-bias triggered data measured by the ALICE photon spectrometer PHOS in $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV p-Pb collisions. In order to confirm the energy calibration of PHOS, the energy-to-momentum ratio for electron was measured and a particularly conspicuous non-linearity effect at low $p_{\rm T}$ region was evaluated. The energy of electrons was measured by PHOS and their momentum was measured by the central tracking system. In addition, we discuss $\pi^{0}$ reconstruction in PHOS via invariant mass analysis of photon pairs. $\pi^{0}$ meson raw spectrum is obtained via a signal peak extracted from the invariant mass distribution. The geometrical acceptance of PHOS and reconstruction efficiency for $\pi^{0}$ meson were evaluated with Monte-Carlo calculations. We present the efficiency corrected $\pi^{0}$ yield.
On behalf of collaboration: ALICE

### Primary author

Tsubasa Okubo (Hiroshima University (JP))

 Slides