Abstract
We report the observation of the doubly Cabibbo-suppressed decay D + → K + π − π + in data from Fermilab charm hadroproduction experiment E791. With a signal of 59 ± 13 events we measured the ratio of the branching fraction for this mode to that of the Cabibbo-favored decay D + → K − π + π + to be B(D + → K + π − π +) / B( D + → K − π + π +) = (7.7 ± 1.7 ± 0.8) × 10 −3. A Dalitz plot analysis was performed to search for resonant structures.
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