Measurement of the branching fraction and time-dependent CP asymmetry for B0 →j /ψπ0 decays

Belle Collaboration

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We measure the branching fraction and time-dependent CP-violating asymmetry for B0→J/ψπ0 decays using a data sample of 711 fb-1 collected on the (4S) resonance by the Belle experiment running at the KEKB e+e- collider. The branching fraction is measured to be B(B0→J/ψπ0)=[1.62±0.11(stat)±0.06(syst)]×10-5, which is the most precise measurement to date. The measured CP asymmetry parameters are S=-0.59±0.19(stat)±0.03(syst) and A=-0.15±0.14(stat)+0.04-0.03(syst). The mixing-induced CP asymmetry (S) differs from the case of no CP violation by 3.0 standard deviations, and the direct CP asymmetry (A) is consistent with zero.

Original languageEnglish
Article number112008
JournalPhysical Review D
Issue number11
Publication statusPublished - 2018 Dec 1


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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