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Achasov, M. N.; Ahmed, S.; Amoroso, A.; Ban, Y.; Cai, X.; Calcaterra, A.; Chen, H. S.; Chen, Z. J.; Dai, H. L.; Deng, Z. Y.; Dong, J.; Fang, J.; Fang, S. S.; Goetzen, K.; Gong, L.; Gong, W. X.; Guo, R. P.; Han, T. T.; Heinsius, F. H.; Hou, Z. L.; Hu, H. M.; Hu, T.; Andersson, W. Ikegami; Janchiv, S.; Jiang, X. S.; Jiao, Z.; Kalantar-Nayestanaki, N.; Kavatsyuk, M.; Kolcu, O. B.; Kupsc, A.; Lavezzi, L.; Lellmann, M.; Li, F.; Li, J. Q.; Li, P. R.; Liang, Y. T.; Libby, J.; Liu, G. M.; Liu, H. M.; Liu, Huihui; Liu, M. H.; Liu, P. L.; Liu, T.; Liu, W. M.; Liu, Z. Q.; Lu, F. X.; Lu, Y.; Luo, X. L.; Ma, H. L.; Ma, X. Y.; Maggiora, M.; Messchendorp, J. G.; Mo, X. H.; Olsen, S. L.; Pan, Y.; Patteri, P.; Pelizaeus, M.; Peters, K.; Qi, H.; Qi, H. R.; Qian, Z.; Qin, J. J.; Rong, G.; Rosner, Ch; Rump, M.; Shan, W.; Shan, X. Y.; Song, J. J.; Sui, F. F.; Sun, W. Y.; Tang, G. Y.; Tian, W. H.; Wang, H. J.; Wang, K.; Wang, Meng; Wang, S.; Wei, D. H.; Wiedner, U.; Wu, L. J.; Wu, X. H.; Xiao, H.; Xu, C. J.; Xu, Q. J.; Yan, L.; Yang, L.; Yu, B. X.; Zhang, H.; Zhang, J. W.; Zhang, J. Y.; Zhang, Jianyu; Zhang, L. M.; Zhang, X. M.; Zhang, Y.; Zhang, Y. T.; Zhao, G.; Zhao, S. J.; Zhong, C.; Zhou, L. P.; Zhu, W. J.; Zou, B. S.
Physical review letters, 04/2022, Letnik: 128, Številka: 14Journal Article
The singly Cabibbo-suppressed decay Lambda(+)(c) -> n pi(+) e is observed for the first time with a statistical significance of 7.3 sigma by using 3.9 fb(-1) of e(+)e(-) collision data collected at center-of-mass energies between 4.612 and 4.699 GeV with the BESIII detector at BEPCII. The branching fraction of Lambda(+)(c) -> n pi(+) is measured to be (6.6 +/- 1.2(stat) 0.4(syst)) x 10(-4). By taking the upper limit of branching fractions of Lambda(+)(c) -> n pi(+) from the Belle experiment, the ratio of branching fractions between Lambda(+)(c) -> n pi(+) and Lambda(+)(c) -> p pi(0) is calculated to be larger than 7.2 at the 90% confidence level, which disagrees with most predictions of the available phenomenological models. In addition, the branching fractions of the Cabibbo-favored decays Lambda(+)(c) -> Lambda pi(+) and Lambda(+)(c)-> Sigma(0)(pi+) are measured to be (1.31 +/- 0.08(stat) +/- 0.05(syst)) x 10(-2) and (1.22 +/- 0.08(stat) +/- 0.07(syst)) x 10(-2), respectively, which are consistent with previous results.
