Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 1: Hadron Structure and Spectroscopy I

HK 1.5: Vortrag

Montag, 27. März 2017, 18:15–18:30, F 5

Model Selection in Partial-Wave Decomposition — •Florian Kaspar, Karl Bicker, Oliver Drotleff, Boris Grube, and Stephan Paul — Physik-Department E18, Technische Universität München

The measurement of the excitation spectrum of light-quark hadrons often requires to apply partial-wave analysis methods. The building blocks of the physical models used in such analyses are the partial-waves, which describe the quantum numbers and the decay paths of the resonances. In diffractive reactions, in principle infinitely many of these waves can contribute. However, for finite data samples, only a finite number of waves carry relevant information. Finding these waves is in general a difficult task. We present a method that imposes constraints in the form of prior probability density functions on the individual waves in order to build sparse models from systematically constructed sets of possible partial waves. As an example we show results of the application of this method to simulated data for diffractively produced π⁻π⁻π⁺ events.

This work was supported by the BMBF, the DFG Cluster of Excellence “Origin and Structure of the Universe” (Exc 153), the computing facilities of the Computational Center for Particle and Astrophysics (C2PAP), and the Maier-Leibnitz-Laboratorium der Universität und der Technischen Universität München.