ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 98, p. -
Measurement of CP asymmetry in a time-dependent dalitz analysis of B0→(ρπ)0 and a constraint on the quark mixing matrix angle 2
We present a measurement of CP asymmetry using a time-dependent Dalitz plot analysis of B0→π+π-π0 decays based on a 414fb-1 data sample containing 449×106BB̄ 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 2, 68°< 2<95° as the 68.3% confidence interval for the 2 solution consistent with the standard model (SM). A large SM-disfavored region also remains. © 2007 The American Physical Society.