Partial-wave analysis of $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ at Belle

Author:

Andrei Rabusov, Daniel Greenwald, Stephan Paul

Keyword:

High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph)

journal:

date:

2023-10-12 16:00:00

Abstract

We present preliminary results of a partial-wave analysis of $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ in data from the Belle experiment at the KEKB $\mathrm{e}^+\mathrm{e}^-$ collider. We demonstrate the presence of the $\mathrm{a}_1(1420)$ and $\mathrm{a}_1(1640)$ resonances in tauon decays 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 tauon electric and magnetic dipole moments and Michel parameters.

PDF: Partial-wave analysis of $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ at Belle.pdf