First measurement of the CKM angle ϕ 3 withS B ± → D(KS0 π + π π 0) K ± decays

The Belle collaboration

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We present the first model-independent measurement of the CKM unitarity triangle angle ϕ3 using B±→ D(KS0π+ππ0) K± decays, where D indicates either a D0 or D¯ 0 meson. Measurements of the strong-phase difference of the D →KS0π+ππ0 amplitude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data set of 772 × 106BB¯ events collected at the Υ(4S) resonance. We obtain ϕ3 = (5.7−8.8+10.2±3.5±5.7)° and the suppressed amplitude ratio rB = 0.323±0.147±0.023±0.051. Here the first uncertainty is statistical, the second is the experimental systematic, and the third is due to the precision of the strong-phase parameters measured from CLEO-c data. The 95% confidence interval on ϕ3 is (−29.7, 109.5)°, which is consistent with the current world average. [Figure not available: see fulltext.]

Original languageEnglish
Article number178
JournalJournal of High Energy Physics
Issue number10
StatePublished - 1 Oct 2019
Externally publishedYes


  • B physics
  • CKM angle gamma
  • CP violation
  • Flavor physics
  • e+-e- Experiments


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