We reconstruct B+/- --> DK+/- decays in a data sample
collected by the CDF II detector at the Tevatron collider corresponding
to 1 fb-1 of integrated luminosity. We select decay modes where the
D meson decays to either K- pi++ (flavor eigenstate) or K- K+, pi+-
pi++ (CP-even eigenstates), and measure the direct CP asymmetry A_CP+
ð.39 +/- 0.17(stat) +/- 0.04(syst), and the double ratio of CP-even
to flavor eigenstate branching fractions R_CP+ ñ.30 +/- 0.24(stat) +/-
0.12(syst). These measurements will improve the determination of the
CKM angle gamma. They are performed here for the first time using data
from hadron collisions.
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Updated: Wednesday, 2010 March 03 11:33:24 CST automatically from input from carol picciolo