Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-01-07
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 3 figures, 2 tables
Scientific paper
In the minimal supersymmetric standard model (MSSM), a strongly first-order electroweak phase transition (EWPT) is only possible in a confined parameter region where one of the scalar top quarks is lighter than the top quark and the other one is as heavy as the SUSY breaking scale. If the MSSM is enlarged to accommodate vector-like quarks and their superpartners, we find that the strongly first-order EWPT is possible without requiring light scalar top quark at the one-loop level, in the limit where the lightest scalar Higgs boson of the MSSM behaves like the Higgs boson of the standard model and the other Higgs bosons are all as heavy as the SUSY breaking scale. The strength of the first-order EWPT is found to be dependent on the mass of the lightest neutral Higgs boson and the mixing effects of the vector-like scalar quarks.
Ham Seung Woo
OH Suhk Kun
Shim Seong-a
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