Observation of the vector meson Cabibbo suppressed decay D+ → ρ0μ+ν

Frabetti, P; Hwk, C; Cumalat, J; Dallapiccola, C; Ginkel, J; Johns, W; Nehring, M; Butler, J; Cihangir, S; Gaines, I; Garbincius, P; Garren, L; Gourlay, S; Harding, D; Kasper, P; Kreymer, A; Lebrun, P; Shukla, S; Vittone, M; Bianco, S; Fabbri, F; Sarwar, S; Zallo, A; Culbertson, R; Gardner, R; Greene, R; Wiss, J; Alimonti, G; Bellini, G; Boschini, M; Brambilla, D; Caccianiga, B; Cinquini, L; Dicorato, M; Giammarchi, M; Inzani, P; Leveraro, F; Malvezzi, S; Menasce, D; Meroni, E; Moroni, L; Pedrini, D; Perasso, L; Prelz, F; Sala, A; Sala, S; Torretta, D; Buchholz, D; Claes, D; Gobbi, B; Oreilly, B; Bishop, J; Cason, N; Kennedy, C; Kim, G; Lin, T; Puseljic, D; Ruchti, R; Shephard, W; Swiatek, J; Zy, W; Arena, V; Boca, G; Castoldi, C; Gianini, G; Ratti, S; Riccardi, C; Viola, L; Vitulo, P; Lopez, A; Grim, G; Paolone, V; Yager, P; Wilson, J; Sheldon, P; Davenport, F; Danyo, K; Handler, T; Cheon, B; Kang, J; Kim, K

doi:10.1016/S0370-2693(96)01548-1

We report on the first statistically significant observation of the vector meson Cabibbo suppressed semileptonic decay D+ → ρ0μ+ν. We measure the branching ratio of the decay mode D+ → ρ0μ+ν (plus possible unobserved γ from D+ → η′μ+ν, η′ → γρ0) with respect to the decay mode D+ → K̄*0μ+ν to be BR (D+ → ρ0μ+ν)/BR (D+ → K̄*0μ+ν) = 0.079 ± 0.019 (stat) ± 0.013 (syst). Data were collected by Fermilab photoproduction experiment E687.

Frabetti, P., Cheung, H., Cumalat, J., Dallapiccola, C., Ginkel, J., Johns, W., et al. (1997). Observation of the vector meson Cabibbo suppressed decay D+ → ρ0μ+ν. PHYSICS LETTERS. SECTION B, 391(1-2), 235-242 [10.1016/S0370-2693(96)01548-1].