Speaker
Luka Santelj
(KEK, Japan)
Description
We present some of the recent measurements of $CP$ violation in $B$ decays based
on the full data sample containing 772 million $B$ meson pairs collected at
the $\Upsilon(4S)$ resonance using the Belle detector at the KEKB
asymmetric-energy $e^+e^-$ collider. In particular, we present measurements of
time-dependent $CP$ violation parameters in $B^0 \to \eta'K^0$, $B^0 \to \omega K^0_S$ and
$B^0\to K^0_S \eta \gamma$ decays. In the Standard Model these decays only proceed through the $b\to s$ quark transition penguin diagrams and are as such very sensitive to new CP violating phases carried by potential new heavy particles in the loops. In addition we also present measurement of direct $CP$ violation in $B^0 \to \eta' K^{\ast 0}$, and measurement of branching fraction of $B^0\to \pi^0\pi^0$ decay. The latter result plays an important role in determinations of $\phi_2$ angle of the unitarity triangle.
Primary author
Luka Santelj
(KEK, Japan)
