Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 69: Strong Interaction / QCD

T 69.7: Vortrag

Donnerstag, 3. April 2025, 17:45–18:00, VG 0.110

Partial-Wave Analysis of τ⁻ → π⁻π⁻π⁺ν_τ at Belle II — •Claudia Perez-Orive¹, Stefan Wallner¹, Hans-Günther Moser¹, Stephan Paul^1,2, Daniel Greenwald², and Andrei Rabusov² — ¹Max Planck Institute for Physics — ²Technical University of Munich

τ⁻ → π⁻ π⁻ π⁺ ν_τ decays measured at the Belle II experiment at the SuperKEKB e⁺e⁻ collider offer a clean environment to investigate light mesons. We perform a detailed partial-wave analysis to precisely study the meson resonances appearing in the 3π system, including the a₁(1260) and the a₁(1420) signal observed by COMPASS.

We will present input-output studies using simulated data where we investigate resolution effects and effects caused by the unmeasured direction of the τ lepton on the partial-wave analysis. Additionally, we study how the fit depends on its initialization.

Keywords: Partial-wave analysis; Tau physics; Belle II