Observation of D+ → ρ(770)0μ+v

• Published in: Physics letters. B 1993-10, Vol.316 (2-3), p.455-462
• Main Authors: Kodama, K., Ushida, N., Paolone, V.S., Volk, J.T., Wilcox, J.O., Yager, P.M., Edelstein, R.M., Freyberger, A.P., Gibaut, D.B., Lipton, R.J., Nichols, W.R., Potter, D.M., Russ, J.C., Zhang, C., Zhang, Y., Jang, H.I., Kim, J.Y., Kim, T.I., Lim, I.T., Pac, M.Y., Baller, B.R., Stefanski, R.J., Nakazawa, K., Chung, K.S., Chung, S.H., Kim, D.C., Park, I.G., Park, M.S., Song, J.S., Yoon, C.S., Chikawa, M., Abe, T., Aoki, S., Fujii, T., Fujioka, G., Fujiwara, K., Hara, T., Taruma, K., Yokoyama, C., Chang, S.D., Cheon, B.G., Cho, J.H., Kang, J.S., Kim, C.O., Kim, K.Y., Kim, T.Y., Lee, J.C., Lee, S.B., Nam, S.W., Shin, T.S., Sim, K.S., Woo, J.K., Isokane, Y., Tsuneoka, Y., Hoshino, K., Kitamura, H., Kobayashi, M., Miyanishi, M., Nakamura, K., Nakamura, M., Nakanishi, S., Niu, K., Niwa, K., Nomura, M., Okada, K., Tajima, H., Toshitou, T., Aryal, M., Dunlea, J.M., Frederiksen, S.G., Kuramata, S., Lundberg, B.G., Oleynik, G.A., Reay, N.W., Sidwell, R.A., Stanton, N.R., Moriyama, K., Shibata, H., Kalbfleisch, G.R., Skubic, P., Smow, J.M., Kusumoto, O., Ohashi, S., Teranaka, M., Tominaga, T., Yoshida, T., Okabe, H., Yokota, J., Ikegami, S., Kazuno, M., Koya, T., Ogawa, S., Shibuya, H., Watanabe, S., Sato, Y., Seshimo, M., Tezuka, I., Bahk, S.Y., Kim, S.K.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(93)90351-H

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.