### Abstract

We present the first model-independent measurement of the CKM unitarity triangle angle ϕ_{3} using B^{±}→ D(KS0π^{+}π^{−}π^{0}) K^{±} decays, where D indicates either a D^{0} or D¯ ^{0} meson. Measurements of the strong-phase difference of the D →KS0π^{+}π^{−}π^{0} amplitude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data set of 772 × 10^{6}BB¯ events collected at the Υ(4S) resonance. We obtain ϕ_{3} = (5.7−8.8+10.2±3.5±5.7)^{°} and the suppressed amplitude ratio r_{B} = 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 ϕ_{3} is (−29.7, 109.5)^{°}, which is consistent with the current world average. [Figure not available: see fulltext.]

Original language | English |
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Article number | 178 |

Journal | Journal of High Energy Physics |

Volume | 2019 |

Issue number | 10 |

DOIs | |

Publication status | Published - 2019 Oct 1 |

### Keywords

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

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

## Fingerprint Dive into the research topics of 'First measurement of the CKM angle ϕ <sub>3</sub> withS B <sup>±</sup> → D(KS0 π <sup>+</sup> π <sup> −</sup> π <sup>0</sup>) K <sup>±</sup> decays'. Together they form a unique fingerprint.

## Cite this

_{3}withS B

^{±}→ D(KS0 π

^{+}π

^{ −}π

^{0}) K

^{±}decays.

*Journal of High Energy Physics*,

*2019*(10), [178]. https://doi.org/10.1007/JHEP10(2019)178