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

Abstract

We present the first evidence of the decay mode $B_s\to \varphi \varphi$ and a measurement of partial width and direct CP asymmetry for the $B^{+}\to \varphi K^{+}$ decay using $180p{b}^{-1}$ of data collected by the CDFII experiment at the Fermilab Tevatron collider. We measure: $BR (\phiphi) = (1.4 \pm 0.6(stat.) \pm 0.2(syst.) \pm 0.5(\BR)) \cdot 10^{-5}$, where the last error is due to the uncertainty on the $B_s\to J/\psi \varphi$ branching ratio used as normalization, $BR(\varphi k)=(7.2\pm 1.3(stat.)\pm 0.7(syst.))\cdot 10^{-6}$ and $\ACP(phi k) = -0.07 \pm 0.17 (stat.) \ase{0.06}{0.05} (syst.)$. We also briefly discuss prospects for studying other charmless $B\to VV$ decays at CDF

arXiv commentTalk given at the 32nd Internation Conference on High Energy Conference