# Spread Supersymmetry

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- 98 Citations

## Abstract

In the multiverse the scale of supersymmetry breaking, \( \widetilde{m} = {F_X}/{M_{ * }} \) _{∗}, may scan and environmental constraints on the dark matter density may exclude a large range of *m* from the reheating temperature after inflation down to values that yield a lightest supersymmetric particle (LSP) mass of order a TeV. After selection effects, for example from the cosmological constant, the distribution for \( \widetilde{m} \) in the region that gives a TeV LSP may prefer larger values. A single environmental constraint from dark matter can then lead to multi-component dark matter, including both axions and the LSP, giving a TeV-scale LSP somewhat lighter than the corresponding value for single-component LSP dark matter.

If supersymmetry breaking is mediated to the Standard Model sector at order *X* ^{†} *X* and higher, only squarks, sleptons and one Higgs doublet acquire masses of order \( \widetilde{m} \). The gravitino mass is lighter by a factor of *M* _{∗} */M* _{Pl} and the gaugino masses are suppressed by a further loop factor. This Spread Supersymmetry spectrum has two versions, one with Higgsino masses arising from supergravity effects of order the gravitino mass giving a wino LSP, and another with the Higgsino masses generated radiatively from gaugino masses giving a Higgsino LSP. The environmental restriction on dark matter fixes the LSP mass to the TeV domain, so that the squark and slepton masses are order 10^{3} TeV and 10^{6} TeV in these two schemes. We study the spectrum, dark matter and collider signals of these two versions of Spread Supersymmetry. The Higgs boson is Standard Model-like and predicted to lie in the range 110-145 GeV; monochromatic photons in cosmic rays arise from dark matter annihilations in the halo; exotic short charged tracks occur at the LHC, at least for the wino LSP; and there are the eventual possibilities of direct detection of dark matter and detailed exploration of the TeV-scale states at a future linear collider. Gauge coupling unification is at least as precise as in minimal supersymmetric theories.

If supersymmetry breaking is also mediated at order *X*, a much less hierarchical spectrum results. The spectrum in this case is similar to that of the Minimal Supersymmetric Standard Model, but with the superpartner masses 1-2 orders of magnitude larger than those expected in natural theories.

## Keywords

Beyond Standard Model Supersymmetry Breaking Superstring Vacua## References

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