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The BaBar collaboration has an extensive program of studying hadronic crosssections in low-energy e+e- collisions, accessible via initial-state radiation.Our measurements allow significant improvements in the precision of thepredicted value of the muon anomalous magnetic moment. These improvements arenecessary for illuminating the current ~3.6 sigma difference between thepredicted and the experimental values. We have published results on a number ofprocesses with two to six hadrons in the final state. We report here theresults of recent studies with final states that constitute the maincontribution to the hadronic cross section in the energy region between 1 and 3GeV, as e+e- to K+K-, pi+pi-, and e+e- to 4 hadrons.

Hadron production in e+e- annihilation at BaBar, and implication for the muon anomalous magnetic moment