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Achasov, M. N.; Ahmed, S.; Amoroso, A.; Ban, Y.; Cai, X.; Calcaterra, A.; Chen, H. S.; Chen, Z. J.; De Mori, F.; Fava, L.; Felici, G.; Greco, M.; Gu, L. M.; Hao, X. Q.; He, K. L.; Himmelreich, M.; Hou, Z. L.; Hu, H. M.; Hu, T.; Ikegami Andersson, W.; Janchiv, S.; Jiang, X. S.; Jiao, Z.; Jin, Y.; Jing, M. Q.; Kliemt, R.; Kupsc, A.; Kurth, M. G.; Lavezzi, L.; Leithoff, H.; Lellmann, M.; Li, C.; Li, F.; Li, X. H.; Li, Xiaoyu; Liu, F. H.; Liu, Y. B.; Luo, C. L.; Luo, M. X.; Luo, T.; Lyu, X. R.; Maldaner, S.; Meng, Z. X.; Min, T. J.; Mitchell, R. E.; Mo, Y. J.; Muramatsu, H.; Nakhoul, S.; Nerling, F.; Nisar, S.; Pan, X.; Qi, M.; Qin, X. P.; Qin, Z. H.; Rashid, K. H.; Sang, H. S.; Schnier, C.; Shen, H. F.; Shi, H. C.; Song, W. M.; Spataro, S.; Su, P. P.; Sun, Y. J.; Sun, Y. K.; Sun, Z. T.; Tang, J.; Wang, C. W.; Wang, H. P.; Wang, M. Z.; Wang, X.; Wang, Y.; Wang, Y. D.; Wang, Z.; Wollenberg, L.; Xing, T. Y.; Yan, F.; Yan, W. C.; Yang, Y. X.; Yang, Yifan; Yang, Zhi; Ye, M.; Yu, T.; Yuan, L.; Yuan, Y.; Yue, C. X.; Zhang, H. H.; Zhang, J. J.; Zhang, Jiawei; Zhang, Lei; Zhang, Shulei; Zhang, X. D.; Zhao, Ling; Zhao, M. G.; Zhao, Z. G.; Zhong, B.; Zhou, Q.; Zhou, X.; Zhu, J.; Zhu, S. H.; Zhu, Z. A.
Physical review. D, 09/2021, Volume: 104, Issue: 5Journal Article
Using 2.93 fb(-1) of e(+)e(-) collision data collected with the BESIII detector at a center-of-mass energy of 3.773 GeV, we measure the absolute branching fractions of the decays D-0 -> K(-)e(+)nu(e) and D+ -> (K) over bar (0)e(+)nu(e) to be (3.567 +/- 0.031(stat) +/- 0.025(syst))% and (8.68 +/- 0.14(stat) +/- 0.16(syst))%, respectively. Starting with the process e(+)e(- ) -> D (D) over bar, a new reconstruction method is employed to select events that contain candidates for both D -> (K) over bare(+)nu(e) and (D) over bar -> Ke(-)(nu) over bar (e) decays. The branching fractions reported in this work are consistent within uncertainties with previous BESIII measurements that selected events containing D -> (K) over bare(+)nu(e) and hadronic (D) over bar decays. Combining our results with the lifetimes of the D degrees and D+ mesons and the previous BESIII measurements leads to a ratio of the two decay partial widths of (Gamma) over bar (D0 -> K-e+)(nu e)/(Gamma) over bar (D+ -> (K) over bar 0e+)(nu e) = 1.039 +/- 0.021. This ratio supports isospin symmetry in the D-0 -> K(-)e(+)nu(e) and D+ -> (K) over bar (0)e(+)nu(e) decays within 1.9 sigma.
