The role of low-energy observables in precision Higgs analysis

TL;DR

This paper emphasizes the importance of incorporating low-energy observables directly into precision Higgs boson analyses to better understand uncertainties and improve the accuracy of theoretical predictions.

Contribution

It introduces a method for integrating low-energy data into Higgs calculations, highlighting the impact of theoretical uncertainties on subpercent precision.

Findings

Low-energy data significantly influence Higgs observable calculations.

Current uncertainties challenge subpercent precision in Higgs partial widths.

A new procedure for global analysis of low-energy inputs is demonstrated.

Abstract

A conventional approach to precision calculations of Higgs boson observables uses quark masses $m_c$ and $m_b$ as inputs. However, quark masses are single numbers that hide a variety of low-energy data from which they are extracted, and also hide the various sources of theoretical uncertainties and correlations with additional input parameters such as $\alpha_s$. Higher-precision calculations, which are needed to give meaning to future measurements, require more direct engagement with the low-energy data in a global analysis. We present an initial calculation in this direction, which illustrates the procedure and reveals some of the theory uncertainties that challenge subpercent determinations of Higgs boson partial widths.