Dalitz plot analysis of three-body charmonium decays at B A B AR

We present preliminary results on the measurement of the I=1/2 Kπ S-wave through a model independent partial wave analysis of η c decays to K S 0 K + π − and K + K − π 0 produced in two-photon interactions. We also perform a Dalitz plot analysis of the J/ψ decays to π + π − π 0 and K + K − π 0 produced in the initial state radiation process.