We present an analysis of the decay D0βK+Οβ from FOCUS. From a
sample of 234 events we find a branching ratio of Ξ(D0βKβΟ+)Ξ(D0βK+Οβ)β=(0.430β0.061+0.062βΒ±0.031)
under the assumption of no mixing and no CP violation. We also present limits
on charm mixing.Comment: Proceedings from talk at 2004 DPF Meeting at University of
California, Riversid