Observation of a resonant structure in $e^{+}{e}^{-}\to K^{+}{K}^{-}\ddot{I}{€}^0\ddot{I}{€}^0$

M. Ablikim, M. N. Achasov, P. Adlarson +498

Using $e^{+}{e}^{-}$ collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total in…