Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Electroweak physics from Belle

Jul 17, 2009, 3:21 PM
Middle Lecture Hall A (Kraków, Poland)

Middle Lecture Hall A

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Standard Model Electroweak Physics VII. Standard Model Electroweak Physics


Kiyoshi Hayasaka (Nagoya)


We report a study of $\tau^- \to \pi^- \pi^+ \pi^- \nu$, $\tau^- \to K^- \pi^+ \pi^- \nu$, $\tau^- \to K^- K^+ \pi^- \nu$ and $\tau^- \to K^- K^+ K^- \nu$ decays using a 666 fb$^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We present the branching fractions as well as the unfolded mass spectra of the total hadronic system for these four decay modes. We also report the result of a search for a second class current (SCC) via $\tau \to \pi \eta^{(')} \nu$ decays. Sensitivity at the $10^{-5}$ level can be achieved, while the branching fraction for a SCC is predicted to be at the $10^{-6} - 10^{-5}$ level in several phenomenological models.

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