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T: Fachverband Teilchenphysik

T 98: Topics in flavor physics

T 98.2: Talk

Friday, April 3, 2020, 11:15–11:30, H-HS XII

Study of tau decay to three charged pions and a neutrino at Belle — •Andrei Rabusov, Daniel Greenwald, and Stephan Paul — Technical University of Munich, Munich, Germany

The COMPASS experiment saw a potential new particle, the a1(1420), that does not fit the quark model. They observed it via its production in pion-proton scattering and subsequent decay to three pions. At Belle, we investigate if this particle appears in tau decays to three pions and a neutrino, using partial wave analysis (PWA). For this technique, it is necessary to know the tau direction. We present data selection criteria for obtaining a clean sample of such tau decays in which knowledge of the tau direction is obtainable upto a two-fold ambiguity.