Observation of the vector meson Cabibbo suppressed decay D+ → ρ0π+ν

1997 
Abstract We report on the first statistically significant observation of the vector meson Cabibbo suppressed semileptonic decay D + → ρ 0 μ + ν . We measure the branching ratio of the decay mode D + → ρ 0 μ + ν (plus possible unobserved γ from D + → η ′ μ + ν , η ′ → γρ 0 ) with respect to the decay mode D + → K ∗0 μ + ν to be BR (D + → ρ 0 μ + ν) BR (D + → K ∗0 μ + ν) = 0.079 ± 0.019 ( stat ) ± 0.013 ( syst ) . Data were collected by Fermilab photoproduction experiment E687.
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