Electroweak phase transitions in the secluded U(1)-prime-extended MSSM

Details Electroweak phase transitions in the secluded U(1)-prime-extended MSSM Electroweak phase transitions in the secluded U(1)-prime-extended MSSM

2009-12-27

arxiv.org/abs/0912.5069v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages,15 figures, JHEP style; accepted for publication in JHEP

Scientific paper

The electroweak phase transition (EWPT) in the secluded-$U(1)'$-extended MSSM (sMSSM) is studied. Using the effective potential at zero and finite temperatures, we search for the non-MSSM-like EWPT in which the light stop mass is larger than the top quark mass. Scanning the parameters relevant to the EWPT, the upper limits of the Higgs boson masses, which are consistent with the strong first order EWPT, are derived. For the lightest CP-even and -odd Higgs bosons, we find $m_{H_1}<160$ GeV and $m_{A_1}<250$ GeV, respectively. In the sMSSM, the tree-level CP violation is possible by the complex soft supersymmetry breaking masses. It is observed that such a CP-violating effect does not spoil the strong first order EWPT for the typical parameter sets.

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