SU(5) - Institute of Particle and Nuclear Physics

Adding SupersymmetryMotivation◮ electroweak scale needs to be stabilised (ɛ ∼ 10 −12 − 10 −14 )◮ proton decay data requires higher GUT scale v ∼ 10 16◮ contributions from Higgs triplet to ρ-parameter needs to besupressed (α → ɛ)Changes◮ SUSY changes the framework from SM to MSSM◮ additional Higgs field needed in rep 5 : ( H 1 H 2 H 3 H 4 H 5)◮ vev:˙H¸= ɛ tan β v`0 0 0 0 1´◮ additional soft SUSY breaking terms [Dimopoulos, Georgi ’81]◮ additional conditions between parameters of the Higgs potential◮◮minimization relations no longer linearneed expansion in ɛ within calculations