München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Hadron Structure and Spectroscopy III

HK 18.4: Vortrag

Dienstag, 19. März 2019, 15:00–15:15, HS 13

Shedding light on exotic charmonium: Reconstruction of a hybrid candidate with PANDARoot by means of a genetic algorithm — •Christian Will, Markus Moritz, and Kai-Thomas Brinkmann for the PANDA collaboration — 2nd Physics Institute, Justus-Liebig-University Giessen

One of the most interesting fields in modern high energy physics is the experimental study of quantum chromodynamics. The PANDA-experiment at FAIR aims to explore this field by probing hadrons with unprecedented precision and sensitivity. It will use proton-antiproton collisions to reach center-of-mass energies of up to 5.5 GeV. Combined with a high luminosity, this will make the detection of exotic resonances with tiny cross sections feasible. In order to support the experiment with simulations, the software framework PANDARoot was developed.

In this talk, the reconstruction of a hybrid candidate in the charmonium sector with PANDARoot will be presented. The decay channel involving the hybrid candidate ultimately decays into seven photons, which makes it an excellent candidate to evaluate the performance of the electromagnetic calorimeter. While seven photons already create immense combinatorical background within the signal channel, there exist at least four background channels with a very similar decay pattern. Hence it is important to maximize the statistical significance of the signal. For this, different optimization algorithms were evaluated, where a genetic algorithm was found to be the most suitable one. Its features and performance will be discussed. This project is supported by BMBF and HIC for Fair.