A New Measure of Fine Tuning

TL;DR

This paper proposes a new quantitative measure of fine tuning in BSM physics models, addressing the need for reliable comparison tools amidst existing constraints and models.

Contribution

It introduces an alternative measure of fine tuning and applies it to toy models and the MSSM for better evaluation of BSM models.

Findings

The new measure provides a different perspective on model tuning.

Application to MSSM reveals insights into its degree of fine tuning.

Comparison with existing measures highlights advantages of the proposed approach.

Abstract

The solution to fine tuning is one of the principal motivations for Beyond the Standard Model (BSM) Studies. However constraints on new physics indicate that many of these BSM models are also fine tuned (although to a much lesser extent). To compare these BSM models it is essential that we have a reliable, quantitative measure of tuning. We review the measures of tuning used in the literature and propose an alternative measure. We apply this measure to several toy models and the Minimal Supersymmetric Standard Model.