Tuesday, March 5, 2013

1303.0800 (Antonio Delgado et al.)

A Light Supersymmetric Higgs Sector Hidden by a Standard Model-like
Higgs
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Antonio Delgado, Germano Nardini, Mariano Quiros
Extending the Higgs sector of the MSSM by triplets alleviates the little hierarchy problem and naturally allows for enhancements in the diphoton decay rate of the lightest Higgs h. In the present paper we analyze in detail the Higgs phenomelogy of this theory with m_h~126 GeV. We mostly focus on a light Higgs sector where the pseudoscalar A, the heaviest CP-even scalar H and the charged H^\pm Higgses are naturally at the electroweak scale. It turns out that for any value m_A > m_h there is a parameter region at small tan(beta) where the CP-even Higgs sector appears at colliders as the SM one. Indeed, H is very rarely produced; h has SM decay rates except its diphoton channel that can be enhanced by a 1-1.4 factor with respect to the SM, depending on some parameter choices. Notably, the existence of this SM-like point, which is absent in the MSSM, is shared with the NMSSM. We also highlight a second parameter region at small m_A and small tan(beta) where the h decay signal strengths, diphoton channel included, are all SM-like but those of bottoms and taus which can have a 10-15 % splitting. In order to discriminate this scenario from the SM improvements in the A and H^\pm searches are worthwhile.
View original: http://arxiv.org/abs/1303.0800

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