ИСТИНА

The MSSM Higgs sector extended by dimension-six operators U(6), which are loop contributions in a Coleman-Weinberg-type potential, is considered. The presence of such additional contributions allows reopening phenomenological MSSM scenarios closed in previous analyses. In order to restrict corresponding parameter space, perturbative unitarity constraints must be satisfied. The common approach for checking this is to consider a two-particle scattering matrix of scalars in the large center-of-mass energy limit where only point interactions contribute. However, due to SUSY-particles interactions in MSSM, trilinear couplings can be significant and large contributions are present at smaller energy. We find the analytical formula for quartic and cubic couplings for the Higgs potential extended by dimension-six operators, compare results with loop corrected constraints, which use the large energy approximation with and without additional U(6)-contributions, and show how the allowed regions in the parameter space are affected in these cases.