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RGEs for coefficients of dim-5 operators giving rise to neutrino masses in the seesaw mechanism are written down in the SM, 2HDM and MSSM, and solved numerically. RG evolution of these coefficients modifies tree-level seesaw predictions for neutrino masses and mixing angles in SO(10)-type GUT models as strongly as quark Yukawa coupling evolution.

Systematic on-shell renormalization programme is carried out for the Higgs and gauge boson sectors of the Minimal Supersymmetric Standard Model. Complete 1-loop results for the 2-and 3-point Green's functions are explicitly given. The Higgs boson masses and the cross sections for the neutral scalar production in the e + e − colliders are calculated.

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Considering the MSSM with the CKM matrix as the only source of flavour violation and heavy supersymmetric particles at large tan β, we analyze the correlation between the increase of the rates of the decays B 0 s,d → µ + µ − and the suppression of ∆M s , that are caused by the enhanced flavour changing neutral Higgs couplings to down-type quarks. We give analytic formulae for the neutral and charged Higgs couplings to quarks including large tan β resummed corrections in the SU (2) × U (1) limit and comment briefly on the accuracy of this approximation. For 0.8 However, we point out that in the less likely scenario in which the squark mixing is so large that the neutral Higgs contributions dominate ∆M s , the rates for B 0 s,d → µ + µ − increase with increasing ∆M s and the bounds in question are weaker. Violation of all these correlations and bounds would indicate new sources of flavour violation.