Recent results on ${\varphi }_3$ at Belle

Abstract

We report results of measurement of the unitarity triangle angle ${\varphi }_3$ with $B^{+}\to D^{(\ast )}{K}^{+}$ Dalitz plot analysis and related issues with $B^0\to D_s^{\ast +}{\pi }^{-}$ and $B^0\to D_s^{\ast -}{K}^{+}$ decay processes. The Dalitz analysis improves accuracy of the angle ${\varphi }_3$ as $78.4^{\circ }{}_{-11.6^{\circ }}^{+10.8^{\circ }}\pm 3.6^{\circ }\pm 8.9^{\circ }$ and the branching fractions are found to be $B^0\to D_s^{\ast +}{\pi }^{-}(K^{-})$ decays are set as $\mathcal{B}(B^0\to D_s^{\ast +}{\pi }^{-})=(1.75\pm 0.34(\mathrm{stat})\pm 0.17(\mathrm{syst})\pm 0.11(\mathcal{B}))\times 10^{-5}$ and $\mathcal{B}(B^0\to D_s^{\ast -}{K}^{+})=(2.02\pm 0.33(\mathrm{stat})\pm 0.18(\mathrm{syst})\pm 0.13(\mathcal{B}))\times 10^{-5}$.

arXiv commentContribution to the proceedings of the Lake Louise Winter Institute, 15th-20th February 2010, Alberta, Canada