Measurements of charmless B decays at Belle

Abstract

These proceedings cover recent measurements of rare charmless decays B+→K‾⁎(892)0K⁎(892)+,B0→η′K⁎(892)0 and B0→π0π0 with a data sample of 772×106BB‾ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. In the decay channel B+→K‾⁎(892)0K⁎(892)+ an excess of 2.73σ is observed, which corresponds to B=(0.77−0.30+0.35±0.12)×10−6 and a longitudinal polarization fL=1.06±0.30±0.14. A signal strength of 5.0σ is measured in the decay channel B0→η′K⁎(892)0 with the corresponding B=(2.6±0.7±0.2)×10−6 and a CP asymmetry of ACP=−0.22±0.29±0.07. Finally we report an updated measurement of B0→π0π0 decays, with a measured branching fraction of B=(0.90±0.12±0.10)×10−6.