SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Instrumentation I

HK 2.4: Vortrag

Montag, 20. März 2023, 17:30–17:45, SCH/A251

Tuning of GFlash for COMPASS calorimeter simulations — •Henri Pekeler, Laney Klipphahn, David Spülbeck, Mathias Wagner, and Bernhard Ketzer — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany

Monte-Carlo simulations of detector setups are an essential element of physics analyses. At COMPASS, we use a high-level Monte Carlo program called TGEANT, which is based on GEANT4, to determine the acceptance of the detector system. For final states with photons from π⁰ or η decays, the correct response of the electromagnetic calorimeter in the simulations is essential.

Instead of tracking every single particle in a shower, which is computationally very expensive, the GFlash algorithm is used. It models the energy distribution and the extend of the shower, which should change for different calorimeter module types.

The COMPASS calorimeters are a combination of homogeneous and sampling calorimeter modules and it is of great importance to verify that reality is described well enough by GFlash. During this talk, we present how we tuned GFlash in order to match the shower shape of real events in the different COMPASS calorimeter modules and showcase the improved photon reconstruction after the tuning.

Supported by BMBF.