# Europhysics Conference on High-Energy Physics 2011

20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

## CPV and CPT in B decays at Belle

21 Jul 2011, 12:15
15m
Oisans (Alpes Congrès - Alpexpo)

### Oisans

#### Alpes Congrès - Alpexpo

Parallel session talk Flavour Physics and Fundamental Symmetries

### Speaker

Dr takeo Higuchi (KEK, Tsukuba)

### Description

Using the large data sample collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we present an improved measurement of time-dependent CP violation in the neutral $B$ decays into charmonium and $K^0$. CPT is expected to be a fundamental symmetry with no significant deviations. Nonetheless we can introduce an artificial perturbation parameter to the $B^0-\bar{B}^0$ mixing system that violates CPT symmetry. The CPT violating parameter, which is a complex number but expected to be zero, can be probed through proper time difference distributions in correlated B meson pair decays. We present a measurement of the CPT violating parameter. We report measurements of branching fractions and CP violation parameters in the neutral B meson decays into $D^+D^-$ and $D^{*+}D^{*-}$. We report the first observation of the radiative decay $B^0 \to \phi K^0 \gamma$ and measurements of time-dependent $CP$-violation. These measurements are sensitive to new physics from right-handed currents. We also report an updated measurement of the branching fraction in $B^+ \to \phi K^+ \gamma$ as well as measurements of a new radiative penguin decay $B \to \omega K^{+}(K^0) \gamma$.

### Primary author

Dr takeo Higuchi (KEK, Tsukuba)

 Slides