# Quark Matter 2018

13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

## Measurement of neutral meson spectra in proton-proton collisions at $\sqrt{s} = 5$ TeV with the ALICE EMCal detector.

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

### First floor and third floor

#### Palazzo del Casinò

Poster Jet modifications and high-pT hadrons

### Speaker

Adam Tomasz Matyja (University of Tennessee (US))

### Description

Neutral meson production in proton-proton collisions is described by pQCD in a large kinematic range. Parameters of theoretical models in both perturbative (NLO, NNLO) and non-perturbative (structure function, fragmentation function) regimes are constrained by neutral pion and $\eta$ meson spectra. The ratio of $\eta$ to $\pi^0$ spectra tests $m_{\rm T}$ scaling violation in the low $p_{\rm T}$ regime. Neutral meson spectra in pp serve as a reference for p-Pb and Pb-Pb measurements at the same collision energy per nucleon pair. Additionally, decay photons coming from neutral mesons are a major source of background for direct photon measurements. There are several methods of neutral meson reconstruction used in the ALICE experiment. Photons are measured directly in the EMCal or PHOS calorimeter or are reconstructed via photon conversion method (PCM) from $e^+ e^-$ pairs coming from photons which converted in the detector. Neutral mesons are combined from photons measured only by one calorimeter, photons reconstructed in PCM or from hybrid methods. The final neutral meson production spectra are a combination of results with different methods. Here we present neutral meson spectra measurements via the invariant mass technique in pp collisions at $\sqrt{s}=5$ TeV with the ALICE electromagnetic calorimeter (EMCal).

Collaboration ALICE Experiment Presenter name already specified

### Primary author

Adam Tomasz Matyja (University of Tennessee (US))