Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-13
Phys.Rev.D84:115024,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 6 figures, 2 tables. V2: minor corrections and references added
Scientific paper
10.1103/PhysRevD.84.115024
We study an extension of the MSSM which includes both new SU(2) triplets with hypercharge $\pm 1$ and a SM gauge singlet (a la NMSSM) which are coupled to each other. We are motivated by the little hierarchy problem, as well as by the $\mu$ problem of the MSSM. We show that the NMSSM and the triplet-extended MSSM can successfully solve problems of one another: while triplets are responsible for large correction to the lightest physical Higgs mass, the singlet's VEV explains why the $\mu$ terms (for the Higgs doublets and the new triplets) are naturally of order the electroweak (EW) scale. We also show that singlet-triplet coupling significantly changes the RG evolution of the singlet mass squared, helping to render this mass squared negative, as required for the singlet to acquire a VEV. We analyze constrains on this scenario from EW precision measurements and find that a relatively large region of the parameter space of this model is viable, especially with the triplet fermions (including doubly-charged) being light.
Agashe Kaustubh
Azatov Aleksandr
Katz Andrey
Kim Doojin
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