Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-10-26
Nucl.Phys.B716:319-351,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
LateX, 40 pages, 12 embedded postscript figures. A discussion of the stability of the Higgs potential and its connection to a
Scientific paper
10.1016/j.nuclphysb.2005.03.025
New fermions, strongly coupled to the Standard Model Higgs boson provide a well motivated extension of the Standard Model (SM). In this work we show that, once new physics at heavier scales is added to stabilize the Higgs potential, such an extension of the SM can strengthen the first order electroweak phase transition and make the electroweak baryogenesis mechanism feasible. We propose a SM extension with TeV Higgsinos, Winos and Binos that satisfy the following properties: a) The electroweak phase transition is strong enough to avoid sphaleron erasure in the broken phase for values of the Higgs mass mH < 300 GeV; b) It provides large CP-violating currents that lead to the observed baryon asymmetry of the Universe for natural values of the CP-violating phase; c) It also provides a natural Dark Matter candidate that can reproduce the observed dark matter density; d) It is consistent with electroweak precision measurements; e) It may arise from a softly broken supersymmetric theory with an extra (asymptotically free) gauge sector; e) It may be tested by electron electric dipole moment experiments in the near future.
Carena Marcela
Megevand Ariel
Quiros Mariano
Wagner Carlos E. M.
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