First measurement of τ→ϕKν by Belle

The first measurement of tau's hadronic decay with a ϕ-meson is reported from Belle collaboration. A clear ϕ-meson peak is first detected, based on high statistic 401 fb−1 of data: Br(τ−→ϕK−ν)=(4.05±0.25±0.26)×10−5 is obtained. Also, a possible ϕK− resonance is examined, but no clear evidence is found.