First measurement of the CKM angle with decays

Resmi, P. K.*; 谷田 聖; Belle Collaboration*; 他166名*

Journal of High Energy Physics (Internet), 2019(10), p.178_1 - 178_27, 2019/10

https://doi.org/10.1007/JHEP10(2019)178

We present the first model-independent measurement of the CKM unitarity triangle angle using decays, where indicates either a or meson. Measurements of the strong-phase difference of the amplitude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data set of events collected at the resonance. We obtain and the suppressed amplitude ratio . 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 is , which is consistent with the current world average.