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We present the first evidence of charmless decays of the $B_s^0$ meson, thedecay \phiphi, and a measurement of the Branching Ratio $\BR(\phiphi)$ using$180 {\rm pb}^{-1}$ of data collected by the \cdfii experiment at the FermilabTevatron collider. In addition, the BR and direct CP asymmetry for the \phik\decay are measured. We obtain: $\BR (\phiphi) = (14 \ase{6}{5}(stat.) \pm6(syst.)) \times 10^{-6}$, $\BR (\phik) = (7.6 \pm 1.3(stat.) \pm 0.6(syst.))\times 10^{-6}$, and $\ACP(\phik) = -0.07 \pm 0.17 (stat.) \ase{0.03}{0.02}(syst.)$. Both decays are governed in the Standard Model by second order(penguin) $b \myto s\bar{s}s$ amplitudes.Comment: Submitted to Physical Review Letters Fixed few typos plus additional  comments to introduction suggested by referee'

physical review letters

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