First Evidence for B_s -> phi phi and Other Penguin B decays at CDF

摘要

We present the first evidence of the decay mode $B_s \to \phi \phi$ and ameasurement of partial width and direct CP asymmetry for the $B^+ \to \phi K^+$decay using $180 pb^{-1}$ of data collected by the CDFII experiment at theFermilab Tevatron collider. We measure: $BR (\phiphi) = (1.4 \pm 0.6(stat.) \pm0.2(syst.) \pm 0.5(\BR)) \cdot 10^{-5}$, where the last error is due to theuncertainty on the $B_s \to J/\psi\phi$ branching ratio used as normalization,$BR (\phi k) = (7.2 \pm 1.3(stat.) \pm 0.7(syst.)) \cdot 10^{-6}$ and $\ACP(phik) = -0.07 \pm 0.17 (stat.) \ase{0.06}{0.05} (syst.)$. We also briefly discussprospects for studying other charmless $B \to VV$ decays at CDF