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 B0s→ π+π− decay, with a significance of 3.7σ, and a measured
branching ratio B(B0s→ π+π−) = (0.57 } 0.15 (stat) }0.10 (syst))
× 10−6. A search for the B0 → K+K−mode in the same sample yields
a significance of 2.0σ, and a central value estimate B(B0 → K+K−) =
(0.23 } 0.10 (stat) } 0.10 (syst)) × 10−6.
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Updated: Wednesday, 2012 October 17 09:17:31 CDT automatically from input from Stephanie A Schuler