J. W. Park
Seoul National University
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Physical Review Letters | 2012
O. Bondarenko; J. C. Chen; Min Chen; J. P. Dai; Y. Gao; J. S. Huang; X. T. Huang; L. K. Jia; S. L. Jin; N. Kalantar-Nayestanaki; M. Kavatsyuk; J. S. Lange; F. Y. Li; Guihua Li; Haibo B. Li; N. B. Li; S. L. Li; Hao Liang; Y. T. Liang; G. R. Liao; C. L. Liu; C. X. Liu; C. Y. Liu; K. Liu; K. Y. Liu; H. Loehner; J. G. Lu; X. L. Luo; C. L. Ma; J. G. Messchendorp
The mass and width of the lowest-lying S-wave spin singlet charmonium state, the η(c), are measured using a data sample of 1.06×10(8) ψ(3686) decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates full interference between the signal reaction, ψ(3686)→γη(c), and a nonresonant radiative background to describe the line shape of the η(c) successfully. We measure the η(c) mass to be 2984.3±0.6±0.6 MeV/c(2) and the total width to be 32.0±1.2±1.0 MeV, where the first errors are statistical and the second are systematic.
