Initial-State Radiation Measurement of the e+e- -> pi+pi-pi+pi- Cross Section
J. P. Lees, V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, M., Martinelli, D. A. Milanes, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, D., N. Brown, L. T. Kerth, Yu. G. Kolomensky, G. Lynch, H. Koch, T. Schroeder, D., J. Asgeirsson, C. Hearty, T. S. Mattison
TL;DR
This paper reports a precise measurement of the e+e- -> pi+pi-pi+pi- cross section using initial-state radiation data from the BABAR experiment, covering energies from 0.6 to 4.5 GeV, with uncertainties below 3%.
Contribution
It provides the most precise initial-state radiation measurement of the four-pion cross section in the specified energy range to date.
Findings
Cross section measured with less than 3% uncertainty in the peak region.
Data covers an energy range from 0.6 to 4.5 GeV.
Results surpass previous energy scan measurements in precision.
Abstract
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.
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