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  • Analysis of $D^+\to\bar K^0e^+\nu_e$ and $D^+\to\pi^0e^+\nu_e$ Semileptonic Decays
    Ablikim, M; Achasov, M. N; Amoroso, A; An, Q; Bertani, M; Bettoni, D; Bianchi, F; Boger, E; Briere, R. A; Chai, J; Chen, H. S; Cibinetto, G; Dai, J. P; Denysenko, I; Dong, L. Y; Fang, X; Farinelli, R; Gong, W. X; Guo, R. P; Guo, Y. P; Hao, X. Q; Heinsius, F. H; Heng, Y. K; Hou, Z. L; Hu, Y; Huang, X. Z; Hussain, T; Ji, X. L; Jiang, L. W; Julin, A; Kalantar-Nayestanaki, N; Kavatsyuk, M; Kiese, P; Leng, C; Li, J. C; Li, Q. Y; Li, W. D; Li, Y. B; Liao, G. R; Liu, B; Liu, F. H; Liu, H. M; Liu, J. Y; Liu, Y. Y; Loehner, H; Lyu, X. R; Ma, T; Ma, X. N; Mao, Z. P; Marcello, S; Min, T. J; Mo, X. H; Muchnoi, N. Yu; Nefedov, Y; Nisar, S; Peters, K; Ruan, X. D; Schnier, C; Shan, W; Shao, M; Shen, X. Y; Sosio, S; Spataro, S; Sun, Y. Z; Tang, X; Thorndike, E. H; Tiemens, M; Wang, B; Wang, B. L; Wang, D. Y; Wang, P; Wen, S. P; Xiao, H; Xie, Y. H; Xiu, Q. L; Xu, J. J; Xu, L; Xu, Q. N; Yan, L; Yan, Y. H; Yang, L; Yang, Y. X; Zafar, A. A; Zhang, D. H; Zhang, H. Y; Zhang, J. L; Zhang, Y. N; Zhang, Z. P; Zhao, J. W; Zhao, Q; Zhao, Q. W; Zhemchugov, A; Zheng, B; Zheng, J. P; Zhu, K; Zhu, K. J; Zhu, S. H; Zhu, X. L; Zhu, Y. S; Zotti, L

    03/2017
    Journal Article

    Phys. Rev. D 96, 012002 (2017) Using 2.93~fb$^{-1}$ of data taken at 3.773 GeV with the BESIII detector operated at the BEPCII collider, we study the semileptonic decays $D^+ \to \bar K^0e^+\nu_e$ and $D^+ \to \pi^0 e^+\nu_e$. We measure the absolute decay branching fractions $\mathcal B(D^+ \to \bar K^0e^+\nu_e)=(8.60\pm0.06\pm 0.15)\times10^{-2}$ and $\mathcal B(D^+ \to \pi^0e^+\nu_e)=(3.63\pm0.08\pm0.05)\times10^{-3}$, where the first uncertainties are statistical and the second systematic. We also measure the differential decay rates and study the form factors of these two decays. With the values of $|V_{cs}|$ and $|V_{cd}|$ from Particle Data Group fits assuming CKM unitarity, we obtain the values of the form factors at $q^2=0$, $f^K_+(0) = 0.725\pm0.004\pm 0.012$ and $f^{\pi}_+(0) = 0.622\pm0.012\pm 0.003$. Taking input from recent lattice QCD calculations of these form factors, we determine values of the CKM matrix elements $|V_{cs}|=0.944 \pm 0.005 \pm 0.015 \pm 0.024$ and $|V_{cd}|=0.210 \pm 0.004 \pm 0.001 \pm 0.009$, where the third uncertainties are theoretical.

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