Friday, December 16, 2011

1112.3647 (M. Kadastik et al.)

Implications of 125 GeV Higgs boson on scalar dark matter and on the CMSSM phenomenology    [PDF]

M. Kadastik, K. Kannike, A. Racioppi, M. Raidal
We study phenomenological implications of the ATLAS and CMS hints for $125\pm 1$ GeV Higgs boson for the singlet, doublet and singlet plus doublet non-supersymmetric dark matter models, and on the phenomenology of the CMSSM. We show that the scalar DM models cannot lower the vacuum stability bounds of the standard model and the 125 GeV Higgs implies the triviality $\lambda=0$ to occur several orders of magnitude below the GUT scale exactly as in the standard model. We perform a detailed study of the full CMSSM parameter space keeping the Higgs boson mass fixed to $125\pm 1$ GeV, and study in detail the freeze-out processes that imply the observed amount of dark matter. After imposing all phenomenological constraints except for the muon $(g-2)_\mu,$ we show that the CMSSM parameter space is divided into well separated regions with distinctive but in general heavy sparticle mass spectrum. Imposing the $(g-2)_\mu$ constraint introduces severe tension between the high SUSY scale and the experimental measurement and only the slepton co-annihilation region survives with potentially testable sparticle masses at the LHC. In the latter case the spin-independent DM-nucleon scattering cross section is predicted to be below detectable limit at the XENON 100 but might be of measurable magnitude in the general case of light dark matter with large gaugino-higgsino mixing and unobservably large scalar masses.
View original: http://arxiv.org/abs/1112.3647

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