Radiation of Light Fermions in Heavy Fermion Production
Abstract
The rate for the production of a pair of massive fermions in e+ e- annihilation plus real or virtual radiation of a pair of massless fermions is calculated analytically. The contributions for real and virtual radiation are displayed separately. The asymptotic behaviour close to threshold and for high energies is given in a compact form. These approximations provide arguments for the appropriate choice of the scale in the O(α) result, such that no large logarithms remain in the final answer.
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