The fine-tuning price of the early LHC

TL;DR

This paper assesses the degree of fine-tuning required in the Constrained Minimal Supersymmetric Standard Model (CMSSM) given current LHC constraints, highlighting the significant reduction in viable parameter space.

Contribution

It quantifies the remaining viable parameter space of the CMSSM after LHC exclusions, emphasizing the high degree of fine-tuning needed.

Findings

Only 0.3% of the CMSSM parameter space remains viable.

The viable fraction increases to 0.9% if Higgs mass bounds are ignored.

LHC constraints significantly restrict supersymmetric models.

Abstract

LHC already probed and excluded half of the parameter space of the Constrained Minimal Supersymmetric Standard Model allowed by previous experiments. Only about 0.3% of the CMSSM parameter space survives. This fraction rises to about 0.9% if the bound on the Higgs mass can be circumvented.