Four-pion production
G. Ecker, R. Unterdorfer
Abstract
Starting from the low-energy structure derived from QCD, we extend the amplitudes for four-pion production in e+ e- annihilation and tau decays up to invariant four-pion masses of 1 GeV. Cross sections and branching ratios BR(rho0 -> 4 pi) are compared with available data.
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