München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Heavy-Ion Collisions and QCD Phases VI

HK 34.5: Talk

Wednesday, March 20, 2019, 15:15–15:30, HS 15

Measurement of ω and η mesons with ALICE in pp collisions at √s = 7 TeV — •Florian Jonas for the ALICE collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster

ALICE has been designed as a heavy-ion experiment and its research focuses on the phase space of strongly interacting matter, in particular the properties of the quark-gluon plasma (QGP) – a phase in which quarks and gluons exist as unconfined particles. The measurement of neutral meson cross sections allows to test and constrain pQCD predictions of meson production. Furthermore, the cross sections are needed as input for other analyses such as direct photon and di-lepton measurements.

In this contribution, the differential invariant cross sections of ω and η meson production at mid-rapidity in proton-proton collisions at √s = 7 TeV are presented. Both mesons are reconstructed using their π⁺π⁻π⁰ decay channel, requiring the measurement of charged pions using ALICE’s tracking capabilities as well as the reconstruction of neutral pions via their decay into two photons. All methods available in ALICE to measure photons at mid-rapidity are used: Its two calorimeters, the EMCal and the PHOS, as well as the so-called Photon Conversion Method (PCM), which allows to measure photons via pair conversions. In addition, two hybrid approaches are used for the neutral pion reconstruction which combine calorimeter photon measurements with the PCM.