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Zhang, B. Zheng, B. Zhong, C. C. Zhang, C. D. Fu, C. Dong, C. F. Qiao, C. F. Redmer, Cheng Li, Ch. Rosner, C. J. Tang, C. Li, C. L. Luo, C. Morales Morales, C. P. Shen, C. Q. Feng, C. Schnier, C. Sowa, C. W. Wang, C. X. Lin, C. X. Liu, C. X. Yu, C. Z. Yuan, Dan Wang, D. Bettoni, D. Dedovich, D. H. Wei, D. H. Zhang, D. Liu, D. M. Li, D. P. Jin, D. W. Bennett, D. Xiao, D. X. Lin, D. Y. Liu, D. Y. Wang, F. A. Harris, Fang Liu, F. Bianchi, F. C. Ma, F. Cossio, F. De Mori, F. E. Maas, Feng Liu, F. F. An, F. Feldbauer, F. H. Heinsius, F. H. Liu, F. Li, F. Nerling, F. Yan, F. Y. Li, G. Chelkov, G. Chen, G. Cibinetto, G. F. Cao, G. Felici, G. F. Xu, G. Li, G. Mezzadri, G. Morello, G. R. Liao, G. Rong, G. S. Huang, G. S. Varner, G. X. Sun, G. Y. Tang, G. Zhao, H. B. Li, H. B. Liu, H. Cai, H. H. Zhang, H. J. Li, H. J. Lu, H. J. Yang, H. L. Dai, H. Leithoff, H. Liang, H. L Liu, H. L. Ma, H. M. Hu, H. M. Liu, H. Muramatsu, H. P. Peng, H. R. Qi, H. S. Chen, Huanhuan Liu, Huihui Liu, H. X. Yang, H. 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Marcello, S. Nakhoul, S. Nisar, S. Pacetti, S. P. Wen, S. Qian, S. S. Fang, S. Sosio, S. Spataro, S. S. Sun, S. X. Du, S. Zhu, T. C. Zhao, T. Held, T. Holtmann, T. Hu, T. Hussain, T. J. Min, T. Johansson, T. J. Zhang, T. Khan, T. Li, T. Weber, T. Y. Qi, U. Wiedner, V. Prasad, W. B. Yan, W. C. Yan, W. D. Li, W. G. Li, W. Gradl, W. Ikegami Andersson, W. J. Zheng, W. K\\\"uhn, W. L. Chang, W. M. Song, W. P. Wang, W. Shan, W. X. Gong, X. A. Xiong, X. B. Ji, X. Cai, X. C. Lou, X. F. Wang, X. H. Mo, X. H. Sun, X. K. Zhou, X. L. Gao, X. Liu, X. L. Ji, X. L. Li, X. L. Luo, X. L. Zhu, X. N. Li, X. N. Ma, X. P. Xu, X. Q. Hao, X. Q. Li, X. R. Lyu, X. R. Zhou, X. Shi, X. S. Jiang, X. S. Kang, X. S. Qin, X. Tang, X. T. Huang, X. Xia, X. X. Ma, X. Y. Jiang, X. Y. Ma, X. Y. Shan, X. Y. Shen, X. Y. Song, X. Y. Zhang, X. Y. Zhou, X. Zhou, X. Z. Huang, Yang Zhang, Yao Zhang, Y. Bai, Y. Ban, Y. B. Chen, Y. B. Liu, Y. B. Zhao, Y. C. Zhu, Y. Ding, Y. Fang, Y. F. Liang, Y. F. Long, Y. Fu, Y. F. Wang, Y. Gao, Y. G. Gao, Y. G. Xie, Y. Hu, Y. H. Xie, Y. H. Yan, Y. H. Yang, Y. H. Zhang, Y. H. Zheng, Yifan Yang, Y. Jin, Y. J. Mao, Y. J. Mo, Y. J. Sun, Y. J. Xiao, Y. K. Heng, Y. K Sun, Y. Lu, Y. M. Ma, Y. Nefedov, Y. Pan, Y. P. Guo, Y. P. Lu, Y. Q. Wang, Y. S. Zhu, Y. T. Gu, Y. T. Liang, Y. T Tan, Y. T. Zhang, Yu Zhang, Y. Wang, Y. Xia, Y. X. Yang, Y. Yuan, Y. Zeng, Y. Zhang, Y. Z. Sun, Z. A. Liu, Z. A. Zhu, Z. B. Li, Z. Gao, Z. G. Wang, Z. G. Zhao, Z. Haddadi, Zhiqing Liu, Z. H. Qin, Z. H. Zhang, Z. Jiao, Z. J. Sun, Z. J. Xiao, Z. L. Dou, Z. L. Hou, Z. L. Huang, Z. Ning, Zongyuan Wang, Z. P. Mao, Z. P. Zhang, Z. T. Sun, Z. Wang, Z. Wu, Z. X. Meng, Z. Y. Deng, Z. Y. Wang, Z. Y. You, Z. Y. Zhang, Z. Zeng","submitted_at":"2018-11-27T09:32:37Z","abstract_excerpt":"Using a $3.19~\\mathrm{fb}^{-1}$ data sample collected at an $e^+e^-$ center-of-mass energy of $E_{\\rm cm}=4.178$ GeV with the BESIII detector, we measure the branching fraction of the leptonic decay $D_s^+\\to\\mu^+\\nu_\\mu$ to be $\\mathcal{B}_{D_s^+\\to\\mu^+\\nu_\\mu}=(5.49\\pm0.16_{\\rm stat.}\\pm0.15_{\\rm syst.})\\times10^{-3}$. Combining our branching fraction with the masses of the $D_s^+$ and $\\mu^+$ and the lifetime of the $D_s^+$, we determine $f_{D_s^+}|V_{cs}|=246.2\\pm3.6_{\\rm stat.}\\pm3.5_{\\rm syst.}~\\mathrm{MeV}$. 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Xu, Q. Liu, Q. L. Xiu, Q. M. Ma, Q. N. Xu, Q. Ouyang, Q. P. Ji, Q. Y. Li, Q. Zhao, Q. Zhou, R. A. Briere, R. Baldini Ferroli, R. E. Mitchell, R. Farinelli, R. G. Ping, R. Kliemt, R. P. Guo, R. Poling, S. A. Cetin, S. Ahmed, S. B. Liu, S. Fegan, S. F. Zhang, S. Han, S. H. Zhu, S. J. Chen, S. Jin, S. J. Zhao, S. Leiber, S. L. Niu, S. L. Olsen, S. Lusso, S. L. Yang, S. Marcello, S. Nakhoul, S. Nisar, S. Pacetti, S. P. Wen, S. Qian, S. S. Fang, S. Sosio, S. Spataro, S. S. Sun, S. X. Du, S. Zhu, T. C. Zhao, T. Held, T. Holtmann, T. Hu, T. Hussain, T. J. Min, T. Johansson, T. J. Zhang, T. Khan, T. Li, T. Weber, T. Y. Qi, U. Wiedner, V. Prasad, W. B. Yan, W. C. Yan, W. D. Li, W. G. Li, W. Gradl, W. Ikegami Andersson, W. J. Zheng, W. K\\\"uhn, W. L. Chang, W. M. Song, W. P. Wang, W. Shan, W. X. Gong, X. A. Xiong, X. B. Ji, X. Cai, X. C. Lou, X. F. Wang, X. H. Mo, X. H. Sun, X. K. Zhou, X. L. Gao, X. Liu, X. L. Ji, X. L. Li, X. L. Luo, X. L. Zhu, X. N. Li, X. N. Ma, X. P. Xu, X. Q. Hao, X. Q. 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Wang, Z. Wu, Z. X. Meng, Z. Y. Deng, Z. Y. Wang, Z. Y. You, Z. Y. Zhang, Z. Zeng","submitted_at":"2018-11-27T09:32:37Z","abstract_excerpt":"Using a $3.19~\\mathrm{fb}^{-1}$ data sample collected at an $e^+e^-$ center-of-mass energy of $E_{\\rm cm}=4.178$ GeV with the BESIII detector, we measure the branching fraction of the leptonic decay $D_s^+\\to\\mu^+\\nu_\\mu$ to be $\\mathcal{B}_{D_s^+\\to\\mu^+\\nu_\\mu}=(5.49\\pm0.16_{\\rm stat.}\\pm0.15_{\\rm syst.})\\times10^{-3}$. Combining our branching fraction with the masses of the $D_s^+$ and $\\mu^+$ and the lifetime of the $D_s^+$, we determine $f_{D_s^+}|V_{cs}|=246.2\\pm3.6_{\\rm stat.}\\pm3.5_{\\rm syst.}~\\mathrm{MeV}$. 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