The health of SUSY after the Higgs discovery and the XENON100 data

TL;DR

This paper uses Bayesian analysis to evaluate the viability of supersymmetry models after the Higgs discovery and XENON100 data, finding they are likely beyond LHC reach but testable with future dark matter experiments.

Contribution

It provides a Bayesian framework to assess SUSY models' parameter space, incorporating recent experimental data and resolving previous discrepancies.

Findings

Most SUSY models are now beyond LHC reach.

XENON1T can fully probe these models.

LSP neutralino mass is around 1 TeV.

Abstract

We analyze the implications for the status and prospects of supersymmetry of the Higgs discovery and the last XENON data. We focus mainly, but not only, on the CMSSM and NUHM models. Using a Bayesian approach we determine the distribution of probability in the parameter space of these scenarios. This shows that, most probably, they are now beyond the LHC reach . This negative chances increase further (at more than 95% c.l.) if one includes dark matter constraints in the analysis, in particular the last XENON100 data. However, the models would be probed completely by XENON1T. The mass of the LSP neutralino gets essentially fixed around 1 TeV. We do not incorporate ad hoc measures of the fine-tuning to penalize unnatural possibilities: such penalization arises automatically from the careful Bayesian analysis itself, and allows to scan the whole parameter space. In this way, we can explain and resolve the apparent discrepancies between the previous results in the literature. Although SUSY has become hard to detect at LHC, this does not necessarily mean that is very fine-tuned. We use Bayesian techniques to show the experimental Higgs mass is at $\sim 2\ \sigma$ off the CMSSM or NUHM expectation. This is substantial but not dramatic. Although the CMSSM or the NUHM are unlikely to show up at the LHC, they are still interesting and plausible models after the Higgs observation; and, if they are true, the chances of discovering them in future dark matter experiments are quite high.