SUSY into Darkness: Heavy Scalars in the CMSSM

TL;DR

This paper surveys the parameter space of the CMSSM, identifying regions consistent with experimental constraints, and discusses their implications for superpartner spectra, dark matter, and potential origins from string theory.

Contribution

It provides a comprehensive analysis of viable CMSSM parameter regions satisfying experimental constraints, linking them to string theory flux compactifications.

Findings

Viable regions have sub-TeV neutralinos and charginos.

Spectra with Higgs mass near 125 GeV require ~1% electroweak fine-tuning.

Predicted neutralino-proton cross-sections are within reach of current experiments.

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.