We search for decays of the type B0_(s) --> h+h'- (where h, h'
= K or pi+) in 180 pb-1 of data collected by the CDF II detector at the
Fermilab Tevatron. We observe the new mode B0(s) --> K+K- with a yield of
236 +/- 32 events, corresponding to (f_s/f_d) x B(B0(s) --> K+K-)/B(B0 -->
K+ pi+-) = 0.46 +/- 0.08(stat.) +/- 0.07(syst.), where f_s/f_d is the ratio
of production fractions of B0(s) and B0. We find results in agreement with
world averages for the modes B0 --> pi++ pi+- and B0 --> K+ pi+-, and set
the following upper limits at 90% CL: B(B0 --> K+K-) < 1.8 x 10-6,
B(B0(s) --> K- pi++) < 5.6 x 10-6, and B(B0(s) --> pi++ pi+-) < 1.7 x 10-6.
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Updated: Thursday, 2006 December 07 10:13:19 CST automatically from input from Carol Picciolo