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The Quasi-Infra-Red Fixed Point at Higher Loops

P. M. Ferreira, I. Jack, D. R. T. Jones

hep-pharXiv:hep-ph/9610296

Abstract

We calculate the four-loop β-function for the generalised Wess-Zumino model. We use the result and Padé-Borel summation to discuss the domain of attraction of the quasi-infra-red fixed point of the top-quark Yukawa coupling in the supersymmetric standard model, and argue that the domain is in fact substantial.

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