SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Hadron Structure and Spectroscopy I
HK 7.2: Vortrag
Montag, 20. März 2023, 17:00–17:15, SCH/A316
Continuity Constraints for Partial-Wave Analyses* — •Florian Kaspar1,2 and Jakob Knollmüller1,2 for the COMPASS collaboration — 1Technische Universität München, James-Franck-Straße 1, 85748 Garching — 2Exzellenzcluster ORIGINS, Boltzmannstr. 2, 85748 Garching
The COMPASS experiment studies the light-meson spectrum in the three-pion final state. The conventional way of extracting resonance parameters, e.g. mass and width, is performing a partial-wave analysis in two steps. First, the individual partial-waves are extracted in bins of the three-pion mass, then a model fit is performed to the results of the first stage. The method reaches its limits for large numbers of partial-waves as the finite amount of data in the individual bins in combination with many free parameters leads to noisy results in this first analysis step. By combining the two analysis steps into one, we are able to apply our knowledge of continuity of the physical signal to the fits. The continuity constraints are implemented via Gaussian Processes. This stabilizes the fits while keeping the extraction effectively model-independent. We use the NIFTy framework for numerical information field theory to implement the continuous model and demonstrate the feasibility of the new method for the three-pion final state. We also outline the way towards the direct extraction of resonance parameters in a single fit to the data.
*funded by the DFG under Germany's Excellence Strategy - EXC2094 - 390783311 and BMBF Verbundforschung 05P21WOCC1 COMPASS