Speaker
Kentaro Negishi
(Tohoku Univ.)
Description
The neutral $B$-meson decay, $B^0\to D^*\pi$, provides a sensitivity to $\sin(2\phi_1+\phi_3)$, where $\phi_1$ and $\phi_3$ are the angles of the unitary triangle. There are two ways that the initial $B^0$ goes to a final state $D^{*-}\pi^+$. One is a Cabbibo-favoured decay (CFD) and the other is via $B^0 \to \bar{B}^0$ mixing followed by a doubly-Cabbibo-suppressed decay (DCSD). The former does not have a weak phase while the latter has a phase of $2\phi_1+\phi_3$ from mixing and decay, thus, CP violation can be measured from time dependent analysis. However, since DCSD is suppressed by $O(\lambda^2)$, expected CP violation is small and large number of events are required. We measured CP violating parameters in this decay with the complete dataset of 710 fb$^{-1}$ accumlated by Belle.
Primary author
Prof.
Youngjoon Kwon
(Yonsei University)
