Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-30
Physics
High Energy Physics
High Energy Physics - Phenomenology
Contribution to the proceedings of "Les Rencontres de Moriond EW 2011" based on arXiv:0911.1882
Scientific paper
We revisit four generations within the context of supersymmetry. We compute the perturbativity limits for the fourth generation Yukawa couplings and show that if the masses of the fourth generation lie within reasonable limits of their present experimental lower bounds, it is possible to have perturbativity only up to scales around 1000 TeV, i.e. the current experimental bounds and perturbative unification are mutually exclusive. Such low scales are ideally suited to incorporate gauge mediated supersymmetry breaking, where the mediation scale can be as low as 10-20 TeV. The minimal messenger model, however, is highly constrained. Lack of electroweak symmetry breaking rules out a large part of the parameter space, and in the remaining part, the fourth generation stau is tachyonic.
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