Measurements of the observed cross sections for e+e−→exclusive light hadrons containing KS0 meson at s=3.773 and 3.650 GeV

Abstract By analyzing the data sets of 17.3 pb −1 taken at s = 3.773 GeV and of 6.5 pb −1 taken at s = 3.650 GeV with the BES-II detector at the BEPC collider, we measure the observed cross sections for the exclusive light hadron final states of K S 0 K − π + , K S 0 K − π + π 0 , K S 0 K − π + π + π − , K S 0 K − π + π + π − π 0 , K S 0 K − π + π + π + π − π − and K S 0 K − π + π 0 π 0 produced in e + e − annihilation at the two energy points. We set the upper limits on the observed cross sections and the branching fractions for ψ ( 3770 ) decay to these final states at 90% C.L.