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Observation of the Y(4230) and a new structure in *
Abstract The cross sections of <?CDATA $ e^+e^- \rightarrow K^+K^-J/\psi $?> at center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fb <?CDATA $ ^{-1} $?> data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape …