Rare Bs and D Decays with the DØ Detector

Searches for the Bs0 → μ+ μ− and D→ π ±μ+ μ− rare decays yield no observed signal, and upper limits are set for these branching ratios. At 90% CL these are respectively B < 7.5 × 10-8 and B < 3.9 s 10-6, and constitute the most stringent limits at the time of this conference.