Abstract
The cross-sections of [Formula: see text] and [Formula: see text] have been measured by BESIII experiment. A new resonance [Formula: see text] is observed in the two decay modes. A combined fit is performed to the two cross-sections. [Formula: see text]’s parameters are determined to be [Formula: see text], [Formula: see text], where the first uncertainties are statistical and the second systematic. The ratio [Formula: see text] is also obtained and it indicates that [Formula: see text]’s main decay modes maybe [Formula: see text]. We determine the lower limit of its leptonic decay width of around 150 eV, which can be compared with the theoretical expectations of different models. These information may help in understanding the nature of this state.
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