Ponente
Dr.
Akimasa Ishikawa
(Tohoku University)
Descripción
We present the measurements of electroweak penguin decays of $B$ and $B_s$ mesons, which are sensitve to New Physics. We have measured the forward-backward asymmetry in $B \to X_s \ell^+ \ell^-$ using a semi-inclusive reconstruction technique. We also report the differential branching fraction, isospin asymmetry, $K^{*}$~polarization, and forward-backward asymmetry of the exclusive $B \to K^{(*)} \ell^+ \ell^-$ process. Some New Physics scenarios predict an enhancement of the branching fraction of $B_{(s)}^0 \to \gamma \gamma$ processes. We present the result of the search for these processes. We also present the study of $B \to K_{1}(1270/1400) \gamma$, which can be used to measure the photon polarization of $b \to s \gamma$ process. Finally, we present the result of time-dependent CP violation in the $B \to \eta K_S^0 \gamma$ decays. The emitted photons in $b\to s \gamma$ decays are predominantly left-handed in the Standard Model (SM), leading to a very little CP asymmetry. Therefore it is sensitive to new physics beyond SM from right-handed current.The analyses are based on the full data set of Belle
Autor primario
Prof.
Youngjoon Kwon
(Yonsei University)
