Using data from the FOCUS experiment (FNAL-E831), we report on the decay of
D0 mesons into final states containing more than one KS0​. We present
evidence for two Cabibbo favored decay modes, D0→KS0​KS0​K−π+ and
D0→KS0​KS0​K+π−, and measure their combined branching fraction
relative to D0→Kˉ0π+π− to be Γ(D0→Kˉ0π+π−)Γ(D0→KS0​KS0​K±π∓)​ = 0.0106
± 0.0019 ± 0.0010. Further, we report new measurements of
Γ(D0→Kˉ0π+π−)Γ(D0→KS0​KS0​KS0​)​ =
0.0179 ± 0.0027 ± 0.0026, Γ(D0→Kˉ0π+π−)Γ(D0→K0Kˉ0)​ = 0.0144 ± 0.0032 ± 0.0016,
and Γ(D0→Kˉ0π+π−)Γ(D0→KS0​KS0​π+π−)​ = 0.0208 ± 0.0035 ± 0.0021 where the first error is
statistical and the second is systematic.Comment: 11 pages, 3 figures, typos correcte