Some Cabibbo suppressed decays of the D0 meson

Using data from the Fermilab photoproduction experiment E691, we have measured branching ratios for the Cabibbo-suppressed decays {ital D}{sup 0}{r arrow}{ital {bar K}} {sup 0}{ital K+}{pi}{sup {minus}}, {ital D}{sup 0}{r arrow}{ital K}{sup 0}{ital K{minus}}{pi}{sup +}, {ital D}{sup 0}{r arrow}{ital K}{sup {minus}}{ital K+}{pi}{sup {minus}}{pi}{sup +}, and {ital D}{sup 0}{r arrow}{pi}{sup +}{pi}{sup +}{pi}{sup {minus}}{pi}{sup {minus}}. The data show evidence for several quasi-two-body decays including {ital D}{sup 0}{r arrow}{ital K}{sup *+}{ital K{minus}} and {ital D}{sup 0}{r arrow}{ital {bar K}} {sup *0}{ital K*0}, but not {ital D}{sup 0}{r arrow}{ital K}{sup *{minus}}{ital K+}. The relative rates of the charged decays indicates that final-state mesons containing virtual-{ital W}{sup +}-decay quarks are more likely to emerge as vector mesons than are those containing the spectator quarks. The high rate observed for {ital D}{sup 0}{r arrow}{ital {bar K}} {sup *0}{ital K*0} indicates that hadronic final-state interactions play a measurable role in charm decays.