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 $B0(s) \to \pi++\pi+-$ decay, with a significance of $3.7\sigma$,
and a measured branching ratio $\mathcal{B}(B0(s) \to \pi++\pi+-)=
(0.57 +- 0.15 (stat) +- 0.10 (syst))\times 10{-6}$. A search for the $B0
\to K+K-$ mode in the same sample yields a significance of $2.0\sigma$,
and a central value estimate $\mathcal{B}(B0 \to K+K-)= (0.23 +- 0.10
(stat) +- 0.10 (syst))\times 10{-6}$.
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Updated: Friday, 2012 January 27 15:54:05 CST automatically from input from "Stephanie A. Schuler"