Direct measurements of the non-DD¯cross sectionσψ(3770)→non−DD¯atEcm=3.773  GeVand the branching fraction forψ(3770)→non−DD¯

Direct measurements of the non-DD¯cross sectionσψ(3770)→non−DD¯atEcm=3.773  GeVand the branching fraction forψ(3770)→non−DD¯