Evidence for the charmless annihilation decay mode $B_s^0\to {\pi }^{+}{\pi }^{-}$

Abstract

We search for annihilation decay modes of neutral $b$ mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6 fb${}^{-1}$ of integrated luminosity, we obtain the first evidence for the $B_s^0\to {\pi }^{+}{\pi }^{-}$ decay, with a significance of $3.7\sigma$, and a measured branching ratio $\mathcal{B}(B_s^0\to {\pi }^{+}{\pi }^{-})=(0.57\pm 0.15(stat)\pm 0.10(syst))\times 10^{-6}$. A search for the $B^0\to K^{+}{K}^{-}$ mode in the same sample yields a significance of $2.0\sigma$, and a central value estimate $\mathcal{B}(B^0\to K^{+}{K}^{-})=(0.23\pm 0.10(stat)\pm 0.10(syst))\times 10^{-6}$.

8 pages, 3 figures, 2 tables. Accepted by Phys.Rev.Lett

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