Gluino Contribution to the 3-loop QCD beta function in the Minimal Supersymmetric Standard Model

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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11 pages, RevTex, 4 Postscript figure

Scientific paper

10.1103/PhysRevD.55.4268

We deduce the gluino contribution to the three-loop QCD \beta function within the minimal supersymmetric Standard Model (MSSM) from its standard QCD expression. The result is a first step in the computation of the full MSSM three-loop \beta function. In addition, in the case of a light gluino it provides the strong three-loop SUSY correction to the extrapolation of the strong coupling constant from the low energy regime to the Z region and up to the squark threshold.

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