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Direct measurement of the branching fraction for the decay of D + → K ¯ 0 e + ν e and determination of <mml:math …

2004; Elsevier BV; Volume: 608; Issue: 1-2 Linguagem: Inglês

10.1016/j.physletb.2004.12.040

1873-2445

M. Ablikim, J.Z. Bai, Y. Ban, J. G. Bian, X. Cai, J. Chang, H.F. Chen, H.S. Chen, H.X. Chen, J.C. Chen, Jin Chen, Jun Chen, M.L. Chen, Y.B. Chen, S.P. Chi, Y. P. Chu, X. Z. Cui, H. L. Dai, Y.S. Dai, Z. Y. Deng, L. Y. Dong, S. X. Du, Z. Z. Du, J. Fang, S. S. Fang, C. D. Fu, H. Y. Fu, C. S. Gao, Yu Gao, Ming Gong, W. X. Gong, S. Gu, Y. Guo, Y. Q. Guo, K. L. He, M. He, Xiao-Gang He, Y. K. Heng, H. M. Hu, J. F. Hu, L. Q. Huang, X. P. Huang, X. B. Ji, Qing Jia, C. H. Jiang, X. S. Jiang, D. P. Jin, S. Jin, Y. Jin, Y. Lai, F. Li, G. Li, H.H. Li, Jingjing Li, J.C. Li, Q.J. Li, R.B. Li, R.Y. Li, S.M. Li, W.G. Li, X.L. Li, X.Q. Li, X.S. Li, Y. F. Liang, H. Liao, C.X. Liu, Fang Liu, Fang Liu, Hanrao Liu, J.B. Liu, J.P. Liu, R.G. Liu, Zhaoyu Liu, Zhengyang Liu, F. Lu, G. R. Lu, J. G. Lü, C. L. Luo, X. L. Luo, F.C. Ma, J.M. Ma, L.L. Ma, Qiang Ma, X. Y. Ma, Z. P. Mao, X. H. Mo, J. Nie, Z. D. Nie, H. P. Peng, N. D. Qi, C. D. Qian, H. Qin, J.F. Qiu, Z. Y. Ren, G. Rong, L. Y. Shan, L. Shang, D. L. Shen, X. Y. Shen, H. Y. Sheng, F. Shi, X. Shi, H. Sun, S. S. Sun, Y. Z. Sun, Z. J. Sun, X. Tang, N. Tao, Y. Tian, G. Tong, D. Wang, Jing Wang, K. Wang, L. Wang, L.S. Wang, Meng Wang, P. Wang, P.L. Wang, S.Z. Wang, W.F. Wang, Y. F. Wang, Zhe Wang, Zheng Wang, Zheng Wang, Z.Y. Wang, C. Wei, D. H. Wei, Ning Wu, Y. M. Wu, X. M. Xia, X. X. Xie, B. Xin, G. F. Xu, H. Xu, Y. C. Xu, S. T. Xue, M. L. Yan, F. Yang, H. X. Yang, Jian Yang, Shuo Yang, Yueling Yang, M. Ye, Mingxin Ye, Y.X. Ye, L. H. Yi, Z. Y. Yi, Yu Chen, G. Yu, C. Z. Yuan, J. M. Yuan, Y. Yuan, Q. Yue, S. L. Zang, Yu Zeng, Y. Zeng, B.X. Zhang, B.Y. Zhang, C.C. Zhang, D.H. Zhang, H.Y. Zhang, J. Zhang, J.Y. Zhang, J.W. Zhang, L.S. Zhang, Qianying ZHANG, S.Q. Zhang, X.M. Zhang, X.Y. Zhang, Yongjie Zhang, Y.Y. Zhang, Yiyun Zhang, Z.P. Zhang, Zhiyao Zhang, Dongxu Zhao, Jiayi Zhao, J. W. Zhao, M. G. Zhao, P. P. Zhao, W. R. Zhao, Xinli Zhao, Y. B. Zhao, H.Q. Zheng, J. P. Zheng, L. S. Zheng, Z. P. Zheng, X. Zhong, B. Q. Zhou, G. M. Zhou, L. Zhou, Nathalie Zhou, Kejun Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, Y. C. Zhu, Z. A. Zhu, B. A. Zhuang, B.S. Zou,

High-Energy Particle Collisions Research

The absolute branching fraction for the decay $D^+ \to \bar K^0 e^+\nu_e$ is determined using $5321\pm 149 \pm 160$ singly tagged $D^-$ sample from the data collected around 3.773 GeV with the BES-II detector at the BEPC collider. In the system recoiling against the singly tagged $D^-$ meson, $34.4\pm 6.1$ events for $D^+ \to \bar K^0 e ^+\nu_e$ is observed. Those yield the absolute branching fraction to be $BF(D^+ \to \bar K^0 e^+\nu_e)=(8.95 \pm 1.59\pm 0.67)%$. The ratio of the two partial widths for the decays of $D^0 \to K^-e^+\nu_e$ and $D^+ \to \bar K^0 e ^+\nu_e$ is determined to be $ \Gamma (D^0 \to K^-e^+\nu_e)/ \Gamma (D^+ \to \bar K^0 e^+\nu_e) = 1.08\pm 0.22 \pm 0.07$.