Europhysics Conference on High-Energy Physics 2011

Jul 20 – 27, 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Other B decays at Belle

Jul 22, 2011, 3:15 PM
15m
les Ecrins 3 (Alpes Congrès - Alpexpo)

les Ecrins 3

Alpes Congrès - Alpexpo

Parallel session talk Flavour Physics and Fundamental Symmetries

Speaker

Dr Min-Zu Wang (NTU, Taipei)

Description

We report measurements of branching fractions and $CP$ violation asymmetries for $B\to \phi\phi K$ decays. Results of the study of $B^{\pm}\to J/\psi K^{\pm}$ and $B^{\pm}\to\eta_C K^{\pm}$, that result in a final state of five kaons, will also be presented. We study the $B^-$ meson decays to the final state of $\overline{p} \Lambda D^0$. The decay $B^-\to\overline{p} \Lambda D^{*0}$ is observed for the first time, with the invariant mass of the $\overline{p}\Lambda$ system peaking near threshold. Furthermore, we set an upper limit on decay branching fraction of $B^-\to\overline{p}\Lambda D^{*0}$ in absence of a statistically significant signal. We report a study of the exclusive $B$ meson decays to the final states $D_s K^0_S\pi$ and $D_s KK$. We use $D_s^- \to\phi\pi^-$, $\bar{K}^*(892)^0 K^-$ and $K^0_S K^-$ decay modes for the $D_s$ reconstruction. The HyperCP experiment at Fermilab reported the observation of three events for $\Sigma \rightarrow p \mu^+\mu^-$ decay. The dimuon masses of the observed events are clustered within detector resolution of 1 MeV/$c^2$, around 214.3 MeV/$c^2$. These decays might be interpreted as a two-body decay, $\Sigma^+ \rightarrow p X^0(214)$, $X^0(214) \rightarrow \mu^+\mu^-$. Several theoretical papers interpret the $X^0(214)$ as a sgoldstino in SUSY model, a light Higgs boson in NMSSM model, or an U-boson. We report on a search for the $X^0$ particle in $B^0$ to $K^+(\pi^+)\pi^ -X^0$ decays. We extend the search to a mass region from 212 MeV/$c^2$ to 500 MeV/$c^2$ with several different $X^0$ lifetime assumptions. We measured the branching fraction of the decay $B^0 \to J/\psi \eta^{ (')}$ based. The branching fraction results were used to constrain the $\eta$-$\eta'$ mixing angle. These analyses are performed using the large data sample collected with the Belle detector near the $\Upsilon(4S)$ resonance at the KEKB asymmetric $e^+e^-$ collider.

Primary author

Dr Min-Zu Wang (NTU, Taipei)

 Slides