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Charge asymmetry in processes e+ e- --> mu+ mu- gamma and e+ e- --> pi+ pi-gamma is measured using 232 fb-1 of data collected with the BABAR detector atcenter-of-mass energies near 10.58 GeV. An observable is introduced and shownto be very robust against detector asymmetries while keeping a largesensitivity to the physical charge asymmetry that results from the interferencebetween initial and final state radiation. The asymmetry is determined asafunction of the invariant mass of the final-state tracks from productionthreshold to a few GeV/c2. It is compared to the expectation from QED for e+ e---> mu+ mu- gamma and from theoretical models for e+ e- --> pi+ pi- gamma. Aclear interference pattern is observed in e+ e- --> pi+ pi- gamma, particularlyin the vicinity of the f_2(1270) resonance. The inferred rate of lowest orderFSR production is consistent with the QED expectation for e+ e- --> mu+ mu-gamma, and is negligibly small for e+ e- --> pi+ pi- gamma.

Measurement of ISR-FSR interference in the processes e+ e- --> mu+ mu- gamma and e+ e- --> pi+ pi- gamma