The TeV Dawn of SUSY Models - Consequences for Flavour and CP

TL;DR

This paper examines the fine-tuning challenges in generic SUSY models without flavor solving mechanisms, considering electroweak, flavor, and CP constraints, and finds minimal fine-tuning occurs at a few TeV, aligning with current experiments.

Contribution

It analyzes the combined fine-tuning from electroweak symmetry breaking, flavor, and CP constraints in generic SUSY models, highlighting the scale of minimal fine-tuning.

Findings

Minimal fine-tuning occurs at a few TeV scale.

Current experiments are consistent with the minimal fine-tuning point.

Results motivate future searches for SUSY at collider and flavor experiments.

Abstract

Direct searches and the hints for the Higgs at ~125 GeV put increasing pressure on simple models of SUSY breaking, in particular (but not exclusively) on those that automatically solve the flavour problem, such as gauge mediation. SUSY-breaking parameters are pushed to higher and higher values, increasing the fine-tuning required to achieve electroweak symmetry breaking at the observed scale. In this note we consider the situation for models which do not attempt to solve the flavour problem. To treat them on equal footing, we consider the combined fine-tuning arising from electroweak symmetry breaking as well as from fulfilling flavour constraints. We also consider CP. We find that for an anarchic flavour (and CP) structure of the soft SUSY breaking terms, the minimum in the fine-tuning occurs at a scale of a few TeV. This is consistent with the current experimental situation and leads to motivating conclusions for direct searches as well as future flavour and CP measurements.