Measurement of CP Asymmetry in a Time-Dependent Dalitz Analysis of B^0 \to (ρπ)^0 and a Constraint on the Quark Mixing Matrix Angle ϕ_2

Abstract

We present a measurement of CP asymmetry using a time-dependent Dalitz plot analysis of B0 --> pi+pi-pi0 decays based on a 414/fb data sample containing 449M BB pairs. The data was collected on the $Υ$(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. Combining our analysis with information on charged B decay modes, we perform a full Dalitz and isospin analysis and obtain a constraint on the CKM angle $ϕ_2$, 68 deg. < $ϕ_2$ < 95 deg. as the 68.3% confidence interval for the $ϕ_2$ solution consistent with the standard model (SM). A large SM-disfavored region also remains.

6 pages, 3 figures, to be submitted to PRL; modification to PRL published version, no essential change in the contents