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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Hadron Structure and Spectroscopy III

HK 24.4: Talk

Tuesday, March 12, 2024, 16:45–17:00, HBR 62: EG 19

Partial-wave analysis of τ⁻→π⁻π⁻π⁺ν_τ at Belle — •Andrei Rabusov, Daniel Greenwald, and Stephan Paul — Technical University of Munich

We present results of a partial-wave analysis of τ⁻→π⁻π⁻π⁺ν_τ in data from the Belle experiment at the KEK e⁺e⁻ collider. We demonstrate the presence of the a₁(1420) and a₁(1640) resonances. We observe the 1⁻[ω(782)π]_P wave using the G-parity violating decay of ω(782)→π⁺π⁻. We also present validation of our findings using a model-independent approach. Our results can improve modeling in simulation studies necessary for measuring the τ electric and magnetic dipole moments and Michel parameters.

Keywords: tauon; decay; axial; Belle; G-parity