科研之友
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摘要
Anomaly-mediated supersymmetry breaking (AMSB) models seem to have become increasingly implausible due to 1) difficulty in generating a Higgs mass m(h) similar to 125 GeV, 2) typically unnatural superparticle spectra characterized by a large superpotential mu term, and 3) the possibility of a winolike lightest supersymmetry particle as dark matter now seems to be excluded. In the present paper, we propose some modifications to the paradigm model which solve these three issues. Instead of adding a universal bulk scalar mass to avoid tachyonic sleptons, we add distinct Higgs and matter scalar soft masses which then allow for light Higgsinos. To gain accord with the measured Higgs mass, we also include a bulk trilinear soft term. The ensuing natural generalized AMSB model then has a set of light Higgsinos with mass nearby the weak scale m(W; Z; h) similar to 100 GeV as required by naturalness, while the winos populate the several hundred GeV range and gluinos and squarks occupy the multi-TeV range. For LHC searches, the wino pair production followed by decay to the same-sign diboson signature channel offers excellent prospects for discovery at the high luminosity LHC along with Higgsino pair production leading to soft dileptons plus jetosthorn thorn MET. A linear ethorne-collider operating above the Higgsino pair production threshold should be able to distinguish the AMSB gaugino spectra from unified or mirage unified scenarios. Dark matter is expected to occur as a Higgsino-like weakly interacting massive particle plus axion admixture.
- 出版日期2018-7-31
