We report measurements of the radiative decay B→K*γ. The analysis is based on a data sample containing 85.0 × 106 B meson pairs collected by the Belle detector at the KEKB storage ring. We measure branching fractions of β(B0→K*0γ) = (4.01±0.21±0.17)× 10-5 and β(B + →K*+ γ) = (4.25±0.31±0.24)× 10-5, where the first and second errors are statistical and systematic, respectively. The isospin asymmetry between B0 and B + decay widths is measured to be Δ0+ = + 0.012±0.044±0.026, assuming an equal production rate for B 0B̄0 and B+B- pairs from the γ(4S) resonance. We search for a partial rate asymmetry between CP conjugate modes, and find ACP(B→K*γ) = -0.015±0.0447plusmn;0.012.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics