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    Albrecht, M.; An, F. F.; Bai, Y.; Berger, N.; Bianchi, F.; Boyko, I.; Calcaterra, A.; Cetin, S. A.; Chelkov, G.; Chen, M. L.; Dou, Z. L.; Fang, X.; Gao, Q.; Guo, R. P.; Haddadi, Z.; Harris, F. A.; He, X. Q.; Hu, H. M.; Hu, T.; Ji, Q. P.; Ji, X. B.; Johansson, T.; Julin, A.; Khoukaz, A.; Koch, L.; Kolcu, O. B.; Kopf, B.; Kühn, W.; Lavezzi, L.; Li, C.; Li, Cheng; Li, D. M.; Li, F. Y.; Li, K. J.; Li, Lei; Li, X. L.; Liu, B. J.; Liu, D.; Liu, Ke; Liu, Q.; Liu, S. B.; Liu, Z. A.; Lu, J. G.; Luo, C. L.; Luo, M. X.; Luo, X. L.; Ma, H. L.; Ma, L. L.; Ma, T.; Ma, X. N.; Min, J.; Muchnoi, N. Yu; Niu, X. Y.; Pacetti, S.; Papenbrock, M.; Patteri, P.; Pelizaeus, M.; Peng, H. P.; Peters, K.; Pitka, A.; Poling, R.; Qiao, C. F.; Qin, N.; Rashid, K. H.; Rong, G.; Shen, P. X.; Shen, X. Y.; Song, X. Y.; Spataro, S.; Sun, G. X.; Sun, J. F.; Sun, L.; Sun, S. S.; Tang, C. J.; Tang, X.; Tiemens, M.; Uman, I.; Wang, D.; Wang, Dan; Wang, K.; Wang, L. L.; Wang, Y. D.; Wang, Z. H.; Wei, J. H.; Wu, L. H.; Xie, Y. G.; Xu, L.; Yang, H. J.; Yang, Y. H.; Yang, Y. X.; Yu, B. X.; Yu, C. X.; Yu, J. S.; Zafar, A. A.; Zhang, J. W.; Zhang, Z. H.; Zhao, J. Z.; Zhao, Z. G.; Zhou, X.; Zhu, Y. C.

    Physical review letters, 07/2018, Letnik: 121, Številka: 2
    Journal Article

    We report the first observation of a$0\atop{0}$(980)-f0(980) mixing in the decays of J/$\psi$ → Φf0(980) → Φa$0\atop{0}$(980) → Φηπ0 and χc1 → a$0\atop{0}$(980)π0 → f0(980)π0 → π+ π- π0, using data samples of 1.31 × 109 J/$\psi$ events and 4.48 × 108 $\psi$(3686) events accumulated with the BESIII detector. The signals of f0(980) → a$0\atop{0}$(980) and a$0\atop{0}$(980) → f0(980) mixing are observed with a statistical significance of 7.4σ and 5.5σ, respectively. The corresponding branching fractions and mixing intensities are measured, and the constraint regions on the coupling constants, ga0K+K- and gf0K+K-, are estimated. The results improve the understanding of the nature of a$0\atop{0}$(980) and f0(980).