Journal Article

Improved measurement of the absolute branching fraction ofD⁺→ K̄⁰ μ ⁺ν _(μ)

Yu, B. X., Jiang, X. Y., Luo, M. X., Achasov, M. N., Gao, Y., Wang, X. F., Luo, C. L., Hu, T., Sun, Z. J., Guo, R. P., Liu, J. B., Ning, Z., Wen, S. P., Cai, H., Zhang, Z. Y., Gao, Z., Kalantar-Nayestanaki, N., Sun, G. X., Kolcu, O. B., Qi, M., Liu, Y. B., Li, P. R., Xu, X. P., Ma, M. M., Min, J., Zhao, Ling, Huang, Z. L., Zhang, H. H., Bianchi, F., Ai, X. C., Li, C., Nikolaev, I. B., Xiao, Z. J., Kliemt, R., Zhou, X., Ye, M. H., Boyko, I., Xu, G. F., Wang, K., Chen, S., Huang, G. S., Lara, M., Heng, Y. K., Ji, Q., Zhang, J. W., Amoroso, A., Rong, G., Qiao, C. F., Zhang, Y. T., Ripka, M., Li, H. J., Wang, Y. F., Nerling, F., Sun, Y. J., Sosio, S., Li, X. Q., Wang, L. L., Fritsch, M., Zotti, L., Bettoni, D., Jin, D. P., Xiu, Q. L., Li, Q. Y., Zheng, B., Denysenko, I., Lu, Y., Varner, G. S., Maas, F. E., Ouyang, Q., Sun, J. F., Pettersson, J., Kang, X. S., Uman, I., Wang, M., Li, Cheng, Ji, X. B., Yu, C. X., Shan, W., Zhang, J. Q., Weber, T., Qian, S., Wang, P., Dong, M. Y., Guo, Y. P., Prasad, V., Fang, S. S., Chang, J. F., Larin, P., Liu, Z. A., Ke, B. C., Ban, Y., Ma, L. L., Bennett, D. W., Wolke, M., Sun, S. S., Fu, C. D., Zhang, Y., Denig, A., Lou, X. C., Liu, B.

2016

Overview

Here, by analyzing 2.93 fb-1 of data collected at √s = 3.773 GeV with the BESIII detector, we measure the absolute branching fraction B(D+ → K¯0μ+νμ) = (8.72 ± 0.07stat. ± 0.18sys.)%, which is consistent with previous measurements within uncertainties but with significantly improved precision. Combining the Particle Data Group values of B(D0 → K-μ+νμ), B(D+ → K¯0e+νe), and the lifetimes of the D0 and D+ mesons with the value of B(D+ → K¯0μ+νμ) measured in this work, we determine the following ratios of partial widths: Γ(D0 → K-μ+νμ)/Γ(D+ → K¯0μ+νμ) = 0.963 ± 0.044 and Γ(D+ → K¯0μ+νμ)/Γ(D+ → K¯0e+νe) = 0.988 ± 0.033.

• Publisher: Springer