Four-pion production in e+ e- annihilation
G. Ecker, R. Unterdorfer
Abstract
We calculate the processes e+ e- -> 4 pions and tau -> nutau + 4 pions to O(p4) in the low-energy expansion of the standard model. The chiral amplitudes of O(p4) can be extended via resonance exchange to energies around 1 GeV. Higher-order effects have been included in the form of omega, a1 and double rho exchange and by performing a resummation of the pion form factor. The predicted cross sections and the branching ratios BR(rho -> 4 pions) are in good agreement with available data.
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