Measurement of CP asymmetries and branching fractions in a time-dependent Dalitz analysis of B0 ---> (rho pi)0 and a constraint on the quark mixing angle phi(2)
Collaboration
26 pages
Published in:
- Phys.Rev.D 77 (2008) 072001
e-Print:
- 0710.4974 [hep-ex]
Report number:
- BELLE-PREPRINT-2007-43,
- KEK-PREPRINT-2007-47
Experiments:
View in:
Citations per year
Abstract: (arXiv)
We 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.Note:
- 26 pages, 12 figures, to be submitted to Phys. Rev. D
- 12.15.Hh
- 11.30.Er
- 13.25.Hw
- electron positron: colliding beams
- electron positron: annihilation
- Upsilon(10570): electroproduction
- B: pair production
- B0: hadronic decay
- final state: (0charm)
- mass spectrum: (rho(770) pi)
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