BELLE2-CONF-PROC-2021-006

Determination of CKM angle $\phi_{3}$ at Belle and Belle II

Niharika Rout

05 March 2021

Abstract: We present the measurement of the angle $\phi_{3}$ using a model-independent Dalitz plot analysis of $B^{\pm} \to DK^{\pm}, D \to K_{S}^{0}\pi^{+}\pi^{-}$ decays, which currently provides the best sensitivity. The method uses, as input, measurements of the strong phase of the $D \to K_{S}^{0}\pi^{+}\pi^{-}$ amplitude from the BESIII collaboration. This is the first measurement using the combined Belle and Belle II data-set of the order of 1 ab$^{-1}$. With the ultimate Belle II data sample of 50 ab$^{-1}$, a determination of $\phi_{3}$ with a precision of 1$^{\rm o}$ or better is foreseen.

Keyword(s): $\phi_{3}$, CKM angle

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