Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 56: Heavy-Ion Collisions and QCD Phases XIV
HK 56.7: Vortrag
Mittwoch, 13. März 2024, 19:00–19:15, HBR 62: EG 05
Performance of photon measurements using PCM with ALICE in Run 3 — •Alica Marie Enderich — Physikalisches Institut, Universität Heidelberg
With the beginning of Run 3 at CERN-LHC and the related upgrades of the detectors used in the ALICE experiment, also the material budget associated with the experimental setup changed. Therefore, a renewal of the knowledge of the material budget is necessary as this is required for the reconstruction of charged particles produced in collisions. This can be achieved by using pions as they make up the biggest fraction of particles created at collisions.
As neutral pions π0 decay into photons, the latter need to be measured in order to reconstruct them. Photons can be measured in ALICE with electromagnetic calorimeters (EMCal and PHOS) as well as with the photon conversion method (PCM).
PCM uses the fact that photons can convert into e+ e− pairs when traversing material which can then be reconstructed. The reconstructed photons can subsequently be used to probe the detector material.
This allows the improvement of Monte Carlo simulations used for charged particle reconstruction.
Furthermore, the experimental π0 mass resolution can be used to examine the momentum resolution and thus the quality of the reconstructed photons.
This talk will present analyses on the PCM performance with ALICE in Run 3 for pp collisions at √sNN = 13.6 TeV. The talk will focus on studies of the material budget as well as the quality of the reconstructed photons. The current status of the analyses will be presented.
Keywords: ALICE Run 3; photon conversion method; particle tracking detectors; interactions of photons with matter; detector modelling and simulations