NNLO tau+tau- production cross section at threshold
P. Ruiz-Femenia, A. Pich
Abstract
The threshold behaviour of the cross section sigma(e+e- -> tau+tau-) is analysed, taking into account the known higher-order corrections. At present, this observable can be determined to next-to-next-to-leading order (NNLO) in a combined expansion in powers of alphas and fermion velocities.
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