München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Hadron Structure and Spectroscopy VI

HK 40.3: Vortrag

Mittwoch, 20. März 2019, 17:15–17:30, HS 13

Monte Carlo acceptance studies of the diffractive production of the η^(′)π⁻ system at COMPASS — •Henri Pekeler, Mikhail Mikhasenko, Waldemar Renz, Mathias Wagner, and Bernhard Ketzer for the COMPASS collaboration — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany

The diffractive production of the η^(′)π⁻ system in the p π⁻ → η^(′) π⁻ p′ channel is very exciting because the partial wave with orbital angular momentum L=1 between the two pseudoscalars carries spin-exotic quantum numbers J^PC=1⁻⁺. The observation of a resonance in this wave is considered a smoking gun for a hybrid meson with gluonic degrees of freedom.

For the partial-wave analysis, a precise knowledge of the acceptance of the apparatus is essential. At COMPASS, there exists a new GEANT4-based simulation framework, which needs to be validated for the given processes. In addition to the correct geometric description of the COMPASS experiment, the responses of the recoil proton detector, the tracking system and the electromagnetic calorimeters have been investigated. For the production of the large Monte Carlo data sample, BlueWaters, one of the most powerful supercomputers in the world, located at the University of Illinois campus in Champaign, is used. In the talk, I will present the validation of the Monte Carlo chain and discuss the multi-dimensional acceptance deduced therewith.

Supported by BMBF.