Spread Supersymmetry
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 multicomponent dark matter, including both axions and the LSP, giving a TeVscale LSP somewhat lighter than the corresponding value for singlecomponent 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 Modellike and predicted to lie in the range 110145 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 TeVscale 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 12 orders of magnitude larger than those expected in natural theories.
 Publication:

Journal of High Energy Physics
 Pub Date:
 January 2012
 DOI:
 10.1007/JHEP01(2012)082
 arXiv:
 arXiv:1111.4519
 Bibcode:
 2012JHEP...01..082H
 Keywords:

 Beyond Standard Model;
 Supersymmetry Breaking;
 Superstring Vacua;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 20 pages, 5 figures