B0 -> pi+ pi- pi0 time-dependent Dalitz analysis from Belle

Details B0 -> pi+ pi- pi0 time-dependent Dalitz analysis from Belle B0 -> pi+ pi- pi0 time-dependent Dalitz analysis from Belle

2006-09-02

arxiv.org/abs/hep-ex/0609003v4

Physics

High Energy Physics

High Energy Physics - Experiment

38 pages, 13 figures; submitted to ICHEP06; appendix C and several minor corrections added; typos corrected; the version submi

Scientific paper

We present the results of a time-dependent Dalitz plot analysis of B0 -> pi+ pi- pi0 decays based on a 414fb^-1 data sample that contains 449MBB pairs collected on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The direct CP violating parameters of B0 -> rho+-pi-+ decay mode are measured to be A_rhopi^+- = +0.22 +- 0.08(stat.) +- 0.05(syst.) and A_rhopi^-+ = +0.08 +- 0.17(stat.) +- 0.12(syst.). We also measure the CP violating parameters of the decay mode B0 -> rho0pi0 as A_rho0pi0 = -0.45 +- 0.35(stat.) +- 0.32(syst.) and S_rho0pi0 = +0.15 +- 0.57(stat.) +- 0.43(syst.). 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 phi_2, phi_2 = (83^+12_-23)^\circ. A large CKM-disfavored region (phi_2<8^\circ and 129^\circ

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