Measurement of the branching fraction and CP asymmetry in B0π0π0 decays, and an improved constraint on ϕ2

T. Julius et al. (Belle Collaboration)
Phys. Rev. D 96, 032007 – Published 31 August 2017

Abstract

We measure the branching fraction and CP violation asymmetry in the decay B0π0π0, using a data sample of 752×106BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB e+e collider. The obtained branching fraction and direct CP asymmetry are B(Bπ0π0)=[1.31±0.19(stat)±0.19(syst)]×106 and ACP=+0.14±0.36(stat)±0.10(syst), respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle’s earlier measurements of B0π+π and B±π±π0 to exclude the CP-violating parameter ϕ2 from the range 15.5°<ϕ2<75.0° at 95% confidence level.

  • Figure
  • Figure
  • Received 7 May 2017

DOI:https://doi.org/10.1103/PhysRevD.96.032007

© 2017 American Physical Society

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Vol. 96, Iss. 3 — 1 August 2017

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