We present a measurement of R_s, the ratio of the branching
fraction for the rare decay D) --> K+ pi+- to that for the Cabibbo-favored
decay D0 --> K- pi++. Charge conjugate decays are implicitly included. A
signal of 2005 +/- 104 events for the decay D0 --> K+ pi+- is obtained
using the CDF II detector at the Fermilab Tevatron collider. The data set
corresponds to an integrated luminosity of 0.35 fb-1 produced in p anti-p
collisions at s**(1/2) = 1.96 TeV. Assuming no mixing, we find R_s = [4.05
+/- 0.21(stat) +/- 0.11 (syst)] x 10-3. This measurement is consistent
with the world average, and comparable in accuracy with the best
measurements from other experiments.
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Updated: Wednesday, 2006 December 20 13:54:57 CST automatically from input from Carol Picciolo