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Achasov, M. N.; Bai, Y.; Berger, N.; Bertani, M.; Cai, X.; Calcaterra, A.; Chang, T. T.; Che, G. R.; Chen, C.; Chen, M. L.; Chen, Y. B.; Cheng, W. S.; Coen, S. C.; Dai, H. L.; Ding, Y.; Fang, J.; Fang, S. S.; Fischer, K.; Ge, Z. W.; Gersabeck, E. M.; Guan, Z. L.; Hao, X. Q.; He, K. K.; He, K. L.; Heinsius, F. H. H.; Herold, C.; Hu, H. M.; Janchiv, S.; Jeong, J. H.; Jiang, P. C.; Jiang, T. J.; Jiang, X. S.; Kang, X. S.; Khoukaz, A.; Kuessner, M. K.; Kühn, W.; Lei, T. T.; Lenz, T.; Li, Ke; Li, W. D.; Li, X. H.; Li, Y. G.; Li, Z. J.; Liang, C.; Liang, Y. T.; Liao, G. R.; Lin, T.; Liu, G. M.; Liu, H. B.; Liu, L.; Liu, L. C.; Liu, Q.; Liu, W. K.; Lu, X. L.; Luo, M. X.; Ma, L. L.; Ma, Q. M.; Ma, Y.; Maldaner, S.; Mao, Y. J.; Meng, Z. X.; Mo, X. H.; Nerling, F.; Ning, Z.; Nisar, S.; Peters, K.; Qin, X. P.; Qin, Z. H.; Rodin, V.; Shi, B. A.; Su, Y. J.; Sun, G. X.; Tang, G. Y.; Teng, J. X.; Wang, K.; Wang, X. L.; Wang, Y. F.; Wang, Y. N.; Wang, Yi; Wang, Ziyi; Xiao, D.; Xiao, Z. J.; Xu, C. J.; Xu, Z. P.; Yan, L.; Yan, W. B.; Yang, H. J.; Yin, J. H.; Yu, B. X.; Zhang, D. H.; Zhang, H. H.; Zhang, J. X.; Zhang, L. M.; Zhang, Y. H.; Zhang, Z. Y.; Zhao, J. Z.; Zhao, Lei; Zhou, Y. Z.; Zhu, S. H.; Zhu, Z. A.
Physical review. D, 11/2023, Volume: 108, Issue: 9Journal Article
This paper reports the study of D+s→τ+ν via τ+→π+¯ντ using a boosted decision tree method, with 7.33 fb−1 of e+e− collision data collected by the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV. The branching fraction of D+s→τ+ντ is determined to be (5.44±0.17stat±0.13syst)%. The product of the D+s decay constant fD+s and the Cabibbo-Kobayashi-Maskawa matrix element |Vcs| is fD+s|Vcs|=(248.3±3.9stat±3.1syst±1.0input) MeV. Combining with the |Vcs| value obtained from the Standard Model global fit or the fD+s from the lattice quantum chromodynamics, we determine |Vcs|=0.993±0.015stat±0.012syst±0.004input and fD+s=(255.0±4.0stat±3.2syst±1.0input) MeV. The first uncertainty is statistical, the second one is systematic and the third one is due to the input parameters, mainly the lifetime of D+s. All results obtained in this work supersede the BESIII previous results based on 6.32 fb−1 of e+e− collision data taken at center-of-mass energies between 4.178 and 4.226 GeV.
