A measurement of the Cabibbo-suppressed decays D0 --> pi+ pi- and D0 --> K+ K-
by P.L. Frabetti et al.
Abstract. We report a measurement of the relative branching ratio of two Cabibbo-suppressed decay modes: D0 --> pi+ pi- and D0 --> K+ K-. The data were accumulated in the 1990-1991 fixed target run of Fermilab high energy photoproduction experiment E687 . The branching ratios of these modes relative to the Cabibbo-allowed decay D0 --> K- pi+ are also presented. The relative branching ratios are measured to be : Gamma(D0 -->KK) / Gamma(D0 -->pi pi) = 2.53 +- 0.46 +- 0.19, Gamma(D0 -->KK) / Gamma(D0 --> K pi) = 0.109 +- 0.007 +- 0.009, and Gamma(D0 --> pi pi) / Gamma(D0 --> K pi) = 0.043 +- 0.007 +- 0.003.