The Crystal Ball detector at the Doris II storage ring at DESY was used to search for the exotic decay processes τ→eγ,τ→eπ0, and τ→eη. No signal was observed. We obtained the following 90% CL upper limits on the branching fractions: B(τ→eγ)<2.0×10-4, B(τ→eπ0)<1.4×10-4, B(τ→eη)<2.4×10-4.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics