Mixing Studies at D0

A combination of oscillation results from D0 based on a 1 fb−1 data sample is reported. A 95% lower confidence-level limit on the oscillation frequency of 15.0 ps−1 is set. The corresponding expected limit is 16.5 ps−1. The combined likelihood curve has a preferred value of 19 ps−1, with a 90% confidence level interval of 17–21 ps−1. The probability for a background fluctuation to give a similar result is about 8%.