SUSY into Darkness: Heavy Scalars in the CMSSM

Abstract

A survey of the mSUGRA/CMSSM parameter space is presented. The viable regions of the parameter space which satisfy all experimental constraints are identified and discussed. These constraints include a 124-127 GeV mass for the lightest CP-even Higgs and the correct relic density for cold dark matter (CDM). The superpartner spectra corresponding to these regions fall within the well-known hyperbolic branch (HB) and are found to possess sub-TeV neutralinos and charginos, with mixed Bino/Higgsino LSP's with 200-800 GeV masses. In addition, the models possess ~3-4 TeV gluino masses and heavy squarks and sleptons with masses heavier than the gluino mass. Spectra with a Higgs mass near 125 GeV and a relic density 0.109 < \Omega h^2 < 0.123 are found to require EWFT at around the one-percent level, while those spectra with a much lower relic density require EWFT of only a few percent. Moreover, the SI neutralino-proton direct detection cross-sections are found to be below or within the XENON100 2-sigma limits and should be experimentally accessible now or in the near future. Finally, it is pointed-out that the supersymmetry breaking soft terms corresponding to these regions of the mSUGRA/CMSSM parameter space (m_0 proportional to m_{1/2} with m_0^2 >> m_{1/2}^2 and A_0 = -m_{1/2}) may be obtained from general flux-induced soft terms in Type IIB flux compactifications with D3 branes.