Mini-Split

TL;DR

This paper explores the phenomenology and model building of Split supersymmetry, considering the implications of current experimental constraints and various mediation mechanisms on the superpartner spectrum.

Contribution

It analyzes the effects of tuning the weak scale on Split supersymmetry models and discusses phenomenological consequences of different mediation mechanisms.

Findings

Gaugino masses are often suppressed, making them accessible at the LHC.

Scalar sparticles are constrained to be below 10^5 TeV by Higgs mass measurements.

Heavy higgsinos are required for successful electroweak symmetry breaking in some models.

Abstract

The lack of evidence for new physics beyond the standard model at the LHC points to a paucity of new particles near the weak scale. This suggests that the weak scale is tuned and that supersymmetry, if present at all, is realized at higher energies. The measured Higgs mass constrains the scalar sparticles to be below 10^5 TeV, while gauge coupling unification favors Higgsinos below 100 TeV. Nevertheless, in many models gaugino masses are suppressed and remain within reach of the LHC. Tuning the weak scale and the renormalization group evolution of the scalar masses constrain Split model building. Due to the small gaugino masses, either the squarks or the up-higgs often run tachyonic; in the latter case, successful electroweak breaking requires heavy higgsinos near the scalar sparticles. We discuss the consequences of tuning the weak scale and the phenomenology of several models of Split supersymmetry including anomaly mediation, U(1)_(B-L) mediation, and Split gauge mediation.