Evidence for B0s→ϕϕ Decay and Measurements of Branching Ratio and ACP for B+→ϕK+

We present the first evidence of charmless decays of the B⁰_s meson, the decay B⁰_s→ϕϕ, and a measurement of the branching ratio BR(B⁰_s→ϕϕ) using 180 pb^-1 of data collected by the CDF II experiment at the Fermilab Tevatron collider. In addition, the BR and direct CP asymmetry for the B⁺→ϕK⁺ decay are measured. We obtain BR(B⁰_s→ϕϕ)=[14⁺⁶_-5(stat)±6(syst)]×10^-6, BR(B⁺→ϕK⁺)=[7.6±1.3(stat)±0.6(syst)]×10^-6, and A_CP(B⁺→ϕK⁺)=-0.07±0.17(stat)+0.03/-0.02(syst). Both decays are governed in the standard model by second order (penguin) b→ss¯s amplitudes.