Improved Higgs Naturalness with Supersymmetry
نویسندگان
چکیده
We present a supersymmetric model of electroweak symmetry-breaking exhibiting improved naturalness, wherein the stop mass can be pushed beyond the reach of the Large Hadron Collider without unnatural fine tuning. This implies that supersymmetry may still solve the hierarchy problem, even if it eludes detection at the LHC. CONSTRAINTS ON THE SCALE OF NEW PHYSICS The standard model (SM) of particle physics provides an excellent fit to precision electroweak experiments, provided the mass mH of the as-yet unobserved Higgs boson is rather light [1], mH . 285 GeV (95 % C. L. ). (1) However, the SM suffers from the hierarchy problem: the electroweak scale is sensitive to higher energy scales occurring in nature, via a quadratically-divergent contribution to the Higgs mass parameter coming dominantly from virtual top quarks. The divergence must be cut off by new physics at some energy scale Λt , which, in the absence of unnatural fine-tuning of parameters, should also be rather low. This has been a major motivation for the ongoing construction of the Large Hadron Collider (LHC). A quantitative measure of the fine-tuning constraint may be given as [2]
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Improved Higgs naturalness with or without supersymmetry
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