The NNLO tau+tau- Production Cross Section Close to Threshold

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 alpha_s and fermion velocities.

23+1 pages, 6 figures

References in corpus (1)

• The vector form factor of the pion from unitarity and analyticity: a model-independent approach

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