Abstract
We report the first observation of the Cabibo disfavored semileptonic decay mode D+ → ρ(770)0μ+v and measure its decay rate relative to the Cabibbo favored mode D+ → K̄∗ (892)0 μ+v to be Λ(D+ → ρ(770)0 μ+vΛ(D+ → K̄∗ (892)0 μ+v) = 0.0440.031−0.025(stat.) ± 0.014 (syst.). The results are compared to theoretical predictions and to previous experimental upper limits.
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