Münster 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 7: CP-Verletzung und Mischungswinkel 1
T 7.7: Vortrag
Montag, 27. März 2017, 18:20–18:35, JUR 490
Freed-Isobar Partial-Wave Analysis — •Fabian Krinner — Technische Universität München, Deutschland
Large data samples of multibody decays of heavy and light mesons, as collected by modern particle physics experiments like BELLE or COMPASS, are challenging to analyze. For such processes, usually Partial-Wave Analyses (PWA) are performed, that allow to extract CP-violation.
For finals states with three or more particles, however, PWA models usually rely on the isobar model, which describes the decay as a chain of subsequent two-body decays. This model relies on knowledge from previous experiments as input for the parameterization of the mass dependence of the decay amplitudes of the appearing intermediate resonances, the so-called isobars ξ. In the most simple case, these are Breit-Wigner amplitudes with measured masses and widths. We present a method that circumvents the necessity for this kind of prior knowledge by employing sets of step-like functions instead of fixed shapes. Doing so, we find under certain conditions mathematical ambiguities in the resulting analysis model and discuss methods to resolve them.
As a simple example, we present the analysis of the decay of a pseudoscalar particle with JPC=0−+ into three pions via two different isobars with JξPC= 0++ (f0-like) and JξPC= 1– (ρ-like).