Measurement of CP Asymmetries and Branching Fractions in a Time-Dependent Dalitz Analysis of B^0-->(rho pi)^0 and a Constraint on the Quark Mixing Angle phi_2

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dc.creatorThe Belle Collaboration
dc.creatorKusaka, A.
dc.creatorWang, C. C.
dc.date2007-10-26
dc.date2008-04-28
dc.date.accessioned2026-07-07T11:53:48Z
dc.date.available2026-07-07T11:53:48Z
dc.descriptionWe present the results of a time-dependent Dalitz plot analysis of B0 --> pi+ pi- pi0 decays based on a 414/fb data sample that contains 449 x 10^6 BB pairs. The data was collected on the Upsilon(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 quark mixing angle phi_2, 68deg. < phi_2 < 95deg. at the 68.3% confidence level for the phi_2 solution consistent with the standard model (SM). A large SM-disfavored region also remains. The branching fractions for the decay processes of B0 --> rho+-(770) pi-+ and B0 --> rho0(770) pi0 are measured to be (22.6 +- 1.1[stat.] +- 4.4 [syst.]) x 10^{-6} and (3.0 +- 0.5 [stat.] +- 0.7 [syst.]) x 10^{-6}, respectively. These are the first branching fraction measurements of the process B0 --> rho(770)pi with the lowest resonance rho(770) explicitly separated from the radial excitations.
dc.description26 pages, 12 figures, to be submitted to Phys. Rev. D; Revision to Phys. Rev. D published version
dc.identifierhttps://arxiv.org/abs/0710.4974
dc.identifierhttp://arxiv.org/abs/0710.4974
dc.identifierPhys.Rev.D77:072001,2008
dc.identifierdoi:10.1103/PhysRevD.77.072001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204674
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of CP Asymmetries and Branching Fractions in a Time-Dependent Dalitz Analysis of B^0-->(rho pi)^0 and a Constraint on the Quark Mixing Angle phi_2
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