Initial-State Radiation Measurement of the e+e- -> pi+pi-pi+pi- Cross   Section
  We study the process e+e- -> pi+pi-pi+pi-gamma, with a photon emitted from the initial-state electron or positron, using 454.3 fb^-1 of data collected with the BABAR detector at SLAC, corresponding to approximately 260,000 signal events. We use these data to extract the non-radiative sigma(e+e- ->pi+pi-pi+pi-) cross section in the energy range from 0.6 to 4.5 Gev. The total uncertainty of the cross section measurement in the peak region is less than 3%, higher in precision than the corresponding results obtained from energy scan data. 
J. P. Lees, V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, M.   Martinelli, D. A. Milanes, A. Palano, M. Pappagallo, G...
hep-ex