Determination of the CKM angle $\phi_{3}$ from a combination of Belle and Belle II results

TL;DR

This paper combines data from Belle and Belle II to measure the CKM angle $ heta_{3}$, achieving a precise value of approximately 78.6 degrees, advancing our understanding of CP violation in the quark sector.

Contribution

It presents a combined analysis of Belle and Belle II data to determine the CKM angle $ heta_{3}$, improving precision over previous measurements.

Findings

Measured $ heta_{3} = (78.6^{+7.2}_{-7.3})^{ ext{o}}$

Combined datasets enhance measurement accuracy

Provides insights into CP violation mechanisms

Abstract

We report a determination of the CKM angle $\phi_{3}$, also known as $\gamma$, from a combination of measurements using samples of up to 711~fb$^{-1}$ from the Belle experiment and up to 362~fb$^{-1}$ from the Belle II experiment. We combine results from analyses of $B^+\to DK^+, B^+\to D\pi^+$, and $B^+ \to D^{*}K^+$ decays, where $D$ is an admixture of $D^0$ and $\overline{D}{}^{0}$ mesons, in a likelihood fit to obtain $\phi_{3} = (78.6^{+7.2}_{-7.3})^{\circ}$. We also briefly discuss the interpretation of this result.