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First Observation of the Direct Production of the chi(c1) in e(+)e(-) Annihilation

BESIII Collaboration; Kolcu, O. B. (AMER PHYSICAL SOC, 2022)

We study the direct production of the J(PC) = 1(++) charmonium state chi(c1)(1P) in electron-positron annihilation by carrying out an energy scan around the mass of the chi(c1)(1P). The data were collected with the BESIII ...