Eur Phys J C (2004) 33: s297-s299
https://doi.org/10.1140/epjcd/s2003-03-209-y

PS02 Rare Decays

Rare decays of tau-lepton

Department of Physics, Nagoya University, Chikusa, Nagoya, 464-8602, Japan

Received: 15 October 2003
Accepted: 12 November 2003
Published online: 1 December 2003

Abstract

We have searched for the Lepton Flavor Violating decays τ ^–→μ ^– γ and τ ^–→μ ^– η using ~85 fb^–1 of data accumulated by the Belle detector at KEKB, and attained preliminary upper limits for the branching fraction Br(τ ^–→μ ^– γ) < 3.2× 10^–7 and Br(τ ^–→μ ^– η) < 3.4 × 10^–7, respectively, at the 90% confidence level. These are the first data that reach to the sensitivity of 10^–7 level, and provide some constraints on the parameter spaces of vs. SUSY mass and vs. Higgs mass.

PACS: number(s) 13.35.Dx, 11.30.Fs, 14.60.Fg