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 |
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Primary author
Tsubasa Okubo
(Hiroshima University (JP))
