Measurement of Branching Fraction and Direct CP Asymmetry in B0-->rho0 pi0 Decays
The Belle Collaboration
Abstract
We report a measurement of the decay B0 --> rho0 pi0, using 386 x 106 BB-bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We detect 51+14-13 signal events with a significance of 4.2 standard deviations, including systematic uncertainties, and measure the branching fraction to be B(B0 --> rho0 pi0) = (3.12+0.88-0.82 (stat) +/- 0.33 (syst) +0.50-0.68 (model)) x 10-6. We also perform the first measurement of direct CP violating asymmetry in this mode.
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