22-29 July 2015
Europe/Vienna timezone

Leptonic and Radiative B meson decays at Belle

Jul 23, 2015, 10:15 AM
15m
HS21

HS21

talk Flavour Physics and Fundamental Symmetries Flavour Physics and Fundamental Symmetries

Speaker

Paoti Chang (National Taiwan University)

Description

We will present new results on leptonic and radiative leptonic decays. Purely leptonic B meson decays, $B \to \ell \nu$, are helicity-suppressed in the Standard Model (SM), and while more challenging for the extraction of the CKM matrix element $|V_{ub}|$, they are excellent probes of models beyond the SM. The decay $B \to \ell \nu\gamma$ is not affected by this suppression and gives access to $\lambda_B$, a parameter used to describe charmless hadronic B decays into two mesons in the QCD factorization (QCDF) scheme. We also report new results on exclusive radiative decays, $B_s \to \gamma\gamma$, $B_s \to \phi\gamma$, and $B_d \to \phi\gamma$, which proceed via flavour-changing-neutral-current transitions $b \to s \gamma \gamma$, $b \to s\gamma$ and $b \to d\gamma$, respectively. These modes are highly sensitive to new physics. All results presented are based on the full data sample accumulated by the Belle experiment at the KEKB asymmetric energy e+e− collider at KEK, Japan.

additional information

Submitted on behalf of the Belle collaboration.
Actual presenter will be selected by the Belle collaboration at a later time.

Primary authors

Paoti Chang (National Taiwan University) Youngjoon Kwon (Yonsei University)

Presentation materials