Initial State Radiation Studies at BaBar

We present results from BaBar on events containing a hard radiated photon from the e+e− initial state and several exclusive final states. For the π+π−π+π− final state the cross section is measured for center-of-mass energies from 0.6 to 4.5 GeV. Resonant structures are studied and confirmed to be dominated by the a1(1260)π, with a contribution from f2(1270)ρ(770). Similar studies are shown for π+π−K+K− and K+K−K+K− from their respective thresholds up to 4.5 GeV. From the π+π−π0 final state the products of the branching fractions of the ω and ϕ mesons have been obtained and the cross section is measured from 1.05 to 3.00 GeV. In addition the J/ψ branching fractions to all four final states have been measured.