SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Hadron Structure and Spectroscopy III

HK 29.2: Vortrag

Mittwoch, 22. März 2023, 14:30–14:45, SCH/A316

Partial-wave analysis of τ⁻→π⁻π⁻π⁺ν_τ at Belle^∗ — •Andrei Rabusov, Daniel Greenwald, and Stephan Paul — Technical University of Munich, James Franck Str. 1, 85748 Garching

We present preliminary 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), a₁(1640), and π(1300) resonances in τ decay and measure their masses and widths. 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.

^∗This work is funded by the DFG under Germany’s Excellence Strategy - EXC2094 - 390783311 and BMBF Verbundforschung (05H21WORD1 HighD, 05H21WOKBA BELLE2, 05P21WOCC1 COMPASS).