Apart from neutrino masses and dark matter, the standard model matches most of the particle data. But it has a "naturalness" problem (and a hierarchy problem and a finetuning problem; I need to understand the nuances of their relations better).
When discussing minimalism, I mentioned the "new minimal standard model". The authors say explicitly that they will not care whether their parameters are finetuned, they will only care about matching the data.
In this era of absent supersymmetry, revisionist perspectives on naturalness and the hierarchy problem are gaining ground. But it's also true that finetuning can be eliminated without introducing the whole supersymmetric spectrum. All you need are "top partners" and maybe higgsinos.
In the discussion of Weniger's 130 GeV gamma ray line, the higgsino is one of the least popular candidates; nonetheless, there are a handful of papers trying to get dark matter, and the line, from higgsinos. So today's question is this: Can we construct a natural extension of a minimal beyond-standard-model theory, in which a higgsino-like particle both supplies the dark matter, and helps to stabilize the mass of the Higgs?
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