17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

Measurements of phi_3 at Belle

18 Jul 2013, 17:15
15m
D1 (KTH Campus)

D1

KTH Campus

Talk presentation Flavour Physics and Fundamental Symmetries Flavour Physics and fundamental symmetries

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)

Presentation Materials