Constrained Supersymmetry after two years of LHC data: global fits with Fittino

TL;DR

This paper performs comprehensive global fits of the CMSSM and NUHM1 models incorporating LHC data, low-energy observables, and dark matter constraints, highlighting tensions with recent experimental results and the potential for a Higgs around 126 GeV.

Contribution

It introduces a detailed global fitting analysis of supersymmetric models using Fittino, integrating latest collider and low-energy data to assess model viability.

Findings

Best fit favors a light Higgs just above exclusion limits.

Increased tension between low-energy observables and LHC non-observation of SUSY.

A Higgs around 126 GeV is barely compatible with the models.

Abstract

We perform global fits to the parameters of the Constrained Minimal Supersymmetric Standard Model (CMSSM) and to a variant with non-universal Higgs masses (NUHM1). In addition to constraints from low-energy precision observables and the cosmological dark matter density, we take into account the LHC exclusions from searches in jets plus missing transverse energy signatures with about 5/fb of integrated luminosity at sqrt(s)=7TeV. We also include the most recent upper bound on the branching ratio Bs->mumu from LHCb. The best fit of the CMSSM prefers a light Higgs boson just above the experimentally excluded mass. We find that the description of the low-energy observables, (g-2)(mu) in particular, and the non-observation of SUSY at the LHC become more and more incompatible within the CMSSM. A potential SM-like Higgs boson with mass around 126 GeV can barely be accommodated. Values for BF(Bs->mumu) just around the Standard Model prediction are naturally expected in the best fit region.