Nonperturbative three-point functions of the O(N) sigma model in the 1/N expansion at NLO

Details Nonperturbative three-point functions of the O(N) sigma model in the 1/N expansion at NLO Nonperturbative three-point functions of the O(N) sigma model in the 1/N expansion at NLO

1998-08-31

arxiv.org/abs/hep-ph/9808496v1

Phys.Lett. B450 (1999) 220-224

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/S0370-2693(99)00022-2

We present a calculation of the three-point functions of the O(N)-symmetric sigma model. The calculation is done nonperturbatively by means of a higher-order 1/N expansion combined with a tachyonic regularization which we proposed in previous publications. We use the results for calculating the standard model process ff -> H -> WW nonperturbatively in the quartic coupling of the scalar sector.

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