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Achasov, M. N.; Ahmed, S.; Amoroso, A.; Bai, Y.; Bennett, J. V.; Bertani, M.; Boyko, I.; Cakir, O.; Chen, P. L.; Dai, J. P.; Dedovich, D.; Destefanis, M.; Dong, M. Y.; Dou, Z. L.; Fang, Y.; Farinelli, R.; Felici, G.; Greco, M.; Gu, L. M.; Guo, Y. P.; He, K. L.; Hu, J. F.; Huang, G. S.; Huang, X. T.; Ji, Q.; Jin, Y.; Ke, B. C.; Kurth, M.; Leiber, S.; Leithoff, H.; Li, F. Y.; Li, J. C.; Li, T.; Li, W. G.; Li, X. L.; Liang, Y. F.; Lin, C. X.; Lin, D. X.; Liu, B.; Liu, C. X.; Liu, D. Y.; Liu, H. B.; Liu, J. B.; Liu, K.; Liu, Q.; Liu, Zhiqing; Lou, X. C.; Lu, H. J.; Lu, Y.; Lusso, S.; Ma, M. M.; Ma, X. X.; Mangoni, A.; Mao, Y. J.; Mezzadri, G.; Mo, X. H.; Ouyang, Q.; Peng, H. P.; Pettersson, J.; Ping, R. G.; Poling, R.; Qi, H. R.; Qin, Z. H.; Ravindran, K.; Redmer, C. F.; Richter, M.; Rolo, M.; Rong, G.; Schnier, C.; Shen, X. Y.; Song, X. Y.; Sowa, C.; Sun, Y. Z.; Tang, C. J.; Tapan, I.; Wang, Dan; Wang, K.; Wang, W. P.; Wang, Y.; Wang, Z.; Xiao, Y. J.; Xu, Q. J.; Yang, Yifan; Yu, C. X.; Zallo, A.; Zhang, B. Y.; Zhang, H. Y.; Zhang, J. Q.; Zhang, J. W.; Zhang, X. Y.; Zhang, Y. T.; Zhang, Z. H.; Zhao, G.; Zhao, J. W.; Zheng, Y. H.; Zhou, L.; Zhou, X. Y.; Zhu, X. L.; Zhu, Y. C.; Zou, B. S.
Physical review. D, 05/2019, Volume: 99, Issue: 9Journal Article
We report the observation of W -annihilation decay Ds+ → ωπ+ and evidence for Ds+ → ωK+ in a data sample corresponding to an integrated luminosity of 3.19 fb–1 collected with the BESIII detector at a center-of-mass energy √s = 4.178 GeV. We obtain the branching fractions B( Ds+ → ωπ+ ) = (1.77 ± 0.32stat ± 0.13sys) ×10–3 with a significance of 6.7σ and B( Ds+ → ωK+ ) = (0.87 ± 0.24stat ± 0.08sys) ×10–3 with a significance of 4.4σ. This measurement provides critical information to determine the nonperturbative W -annihilation amplitudes and shows the potential of searching for CP asymmetry in Ds+ → ωK+ .
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