Abstract
Using data from Fermilab photoproduction experiment E691, we measure the ratio of branching fractions between the Cabibbo-suppressed modes {ital B}({ital D}{sup 0}{r arrow}{ital K}{sup {minus}}{ital K+})/{ital B}({ital D}{sup 0}{r arrow}{pi}{sup {minus}}{pi}{sup +}) to be 1.95{plus minus}0.34{plus minus}0.22. We also report branching fractions for the modes {ital D}{sup 0}{r arrow}{ital K}{sup {minus}}{ital K+} and {ital D}{sup 0}{r arrow}{pi}{sup {minus}}{pi}{sup +} relative to the Cabibbo-allowed decay {ital D}{sup 0}{r arrow}{ital K}{sup {minus}}{pi}{sup +}. Furthermore, we place an upper limit of 0.45 at the 90% C.L. on the {ital CP}-violating asymmetry in {ital D}{sup 0}{r arrow}{ital K}{sup {minus}}{ital K+} vs {ital {bar D}} {sup 0}{r arrow}{ital K}{sup {minus}}{ital K+} decays.
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