Dan Mickelson

Radiative natural supersymmetry: Reconciling electroweak fine-tuning and the Higgs boson mass

Models of natural supersymmetry seek to solve the little hierarchy problem by positing a spectrum of light higgsinos m_0 leads to automatic cancellations during renormalization group (RG) running, and to radiatively-induced low fine-tuning at the electroweak scale. Coupled with large mixing in the top squark sector, RNS allows for fine-tuning at the 3-10% level with TeV-scale top squarks and a 125 GeV light Higgs scalar h. The model allows for at least a partial solution to the SUSY flavor, CP and gravitino problems since first/second generation scalars (and the gravitino) may exist in the 10-30 TeV regime. We outline some possible signatures for RNS at the LHC and at a linear e^+e^- collider. If the strong CP problem is solved by the Peccei-Quinn mechanism, then RNS naturally accommodates mixed axion-higgsino cold dark matter, where the light higgsino-like WIMPS - which in this case make up only a fraction of the measured relic abundance - should be detectable at upcoming WIMP detectors.

Post-LHC7 fine-tuning in the minimal supergravity/CMSSM model with a 125 GeV Higgs boson

The recent discovery of a 125 GeV Higgs-like resonance at LHC, coupled with the lack of evidence for weak scale supersymmetry (SUSY), has severely constrained SUSY models such as minimal supergravity (mSUGRA)/CMSSM. As LHC probes deeper into SUSY model parameter space, the little hierarchy problem---how to reconcile the

How conventional measures overestimate electroweak fine-tuning in supersymmetric theory

Z

SUSY models under siege: LHC constraints and electroweak fine-tuning

and Higgs boson mass scale with the scale of SUSY breaking---will become increasingly exacerbated unless a sparticle signal is found. We evaluate two different measures of fine-tuning in the mSUGRA/CMSSM model. The more stringent of these,

Direct and indirect detection of higgsino-like WIMPs: concluding the story of electroweak naturalness

{\ensuremath{\Delta}}_{\mathrm{HS}}

Same-Sign Diboson Signature from Supersymmetry Models with Light Higgsinos at the LHC

, includes effects that arise from the high-scale origin of the mSUGRA parameters while the second measure,

Radiatively-driven natural supersymmetry at the LHC

{\ensuremath{\Delta}}_{\mathrm{EW}}

Physics at a Higgsino factory

, is determined only by weak scale parameters: hence, it is universal to any model with the same particle spectrum and couplings. Our results incorporate the latest constraints from LHC7 sparticle searches, LHCb limits from

Natural SUSY with a bino- or wino-like LSP

{B}_{s}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}

Implications of naturalness for the heavy Higgs bosons of supersymmetry

and also require a light Higgs scalar with