Two-photon production of pion pairs

We present a new high-statistics measurement of the cross section for the process e⁺e^--->e⁺e^-π⁺π^- at a center-of-mass energy of 29 GeV for invariant pion-pair masses M(π⁺π^-) between 350 MeV/c² and 1.6 GeV/c². We observe the f₂(1270) and measure its radiative width to be 3.15+/-0.04+/-0.39 keV. We also observe an enhancement in the π⁺π^- spectrum near 1 GeV. General agreement is found with unitarized models of the γγ-->π⁺π^- reaction that include final-state interactions.