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  • Measurement of e + e − → K ...
    Achasov, M. N.; Ahmed, S.; Amoroso, A.; Bai, J. Z.; Bennett, D. W.; Calcaterra, A.; Chai, J.; Chen, P. L.; Dai, H. L.; Dbeyssi, A.; De Mori, F.; Ding, Y.; Dong, M. Y.; Farinelli, R.; Fritsch, M.; Gao, Q.; Gao, Z.; Greco, M.; Guo, A. Q.; Guskov, A.; Harris, F. A.; He, K. L.; Heng, Y. K.; Hou, Z. L.; Huang, G. S.; Huang, X. T.; Huang, X. Z.; Ji, Q. P.; Ke, B. C.; Keshk, I. K.; Kurth, M.; Li, Cheng; Li, F. Y.; Li, G.; Li, J. W.; Li, Kang; 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.; Lou, X. C.; Lu, H. J.; Lu, Y.; Lusso, S.; Ma, M. M.; Ma, X. N.; Mangoni, A.; Mao, Y. J.; Mezzadri, G.; Muchnoi, N. Yu; Niu, S. L.; Pan, Y.; Pelizaeus, M.; Pettersson, J.; Ping, R. G.; Qi, H. R.; Qiao, C. F.; Qiu, J. F.; Richter, M.; Shen, P. X.; Shi, X.; Sun, G. X.; Sun, S. S.; Sun, X. H.; Sun, Y. K.; Sun, Z. J.; Tang, C. J.; Uman, I.; Wang, B.; Wang, B. L.; Wang, L. S.; Wang, Z. G.; Weber, T.; Weidenkaff, P.; Wiedner, U.; Wolke, M.; Wu, L. H.; Xiao, D.; Xie, Y. G.; Xiu, Q. L.; Xu, J. J.; Yan, W. C.; Yang, H. J.; Zafar, A. A.; Zhang, J. L.; Zhang, K.; Zhang, Yi; Zhang, Z. Y.; Zhao, J. Z.; Zhao, Lei; Zhao, T. C.; Zhu, A. N.

    Physical review. D, 02/2019, Letnik: 99, Številka: 3
    Journal Article

    The cross section of the process e+e−→K+K− is measured at a number of center-of-mass energies s from 2.00 to 3.08 GeV with the BESIII detector at the Beijing Electron Positron Collider (BEPCII). The results provide the best precision achieved so far. A resonant structure around 2.2 GeV is observed in the cross section line shape. A Breit-Wigner fit yields a mass of M=2239.2±7.1±11.3  MeV/c2 and a width of Γ=139.8±12.3±20.6  MeV, where the first uncertainties are statistical and the second ones are systematic. In addition, the timelike electromagnetic form factor of the kaon is determined at the individual center-of-mass energy points.