Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster

HK 52.8: Poster

Thursday, March 1, 2018, 16:30–18:45, Audimax Foyer

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

ALICE is designed as a heavy ion experiment and its research mainly focuses on the properties of the quark gluon plasma (QGP) – a phase in which quarks and gluons exist as unconfined particles. Due to the high energy densities reached in PbPb collisions, the creation of the QGP is expected and supported by measurements up to this point.

One way to probe the medium are photons radiated by the hot QGP. Due to their lack of strong interaction, they can transverse unaffected through the later stages of the plasma and then be detected by ALICE detectors. But the direct photons are only a small contribution to the total amount of photons that are detected in each collision. This motivates the reconstruction of mesons like the π⁰, η, ω and others, given the fact that a good knowledge of their spectra is directly linked to the amount of decay photons.

In this contribution, the current status on the reconstruction of the ω and the η meson, using their π⁺π⁻π⁰ decay channel in pp collisions at √s = 7 TeV will be presented. ALICE’s two calorimeters PHOS and EMCal, the so called Photon Conversion Method (PCM) and two hybrid methods will be used to detect the photons needed to reconstruct the neutral pions, profiting from the different resolutions and reconstruction efficiencies of each detection method.