Automatised full one-loop renormalisation of the MSSM I: The Higgs sector, the issue of tan(beta) and gauge invariance

Understand

We give an extensive description of the renormalisation of the Higgs sector of the minimal supersymmetric model in SloopS.

• SloopS is an automatised code for the computation of one-loop processes in the MSSM.
• In this paper, the first in a series, we study in detail the non gauge invariance of some definitions of tan(beta).
• We rely on a general non-linear gauge fixing constraint to make the gauge parameter dependence of different schemes for tan(beta) at one-loop explicit.