The universal Higgs fit

TL;DR

This paper presents a comprehensive global fit to Higgs data, creating a universal framework to test various models and extract key Higgs properties, confirming the Standard Model predictions and constraining alternative theories.

Contribution

The authors develop a universal fit methodology that synthesizes all Higgs data, enabling model-independent testing and extraction of Higgs couplings, branching ratios, and mass from experimental rates.

Findings

Best fit regions align with Standard Model predictions.

Latest data exclude the dilaton as an alternative Higgs.

Derived Higgs mass from rates: 125.0 ± 1.8 GeV.

Abstract

We perform a state-of-the-art global fit to all Higgs data. We synthesise them into a 'universal' form, which allows to easily test any desired model. We apply the proposed methodology to extract from data the Higgs branching ratios, production cross sections, couplings and to analyse composite Higgs models, models with extra Higgs doublets, supersymmetry, extra particles in the loops, anomalous top couplings, invisible Higgs decay into Dark Matter. Best fit regions lie around the Standard Model predictions and are well approximated by our 'universal' fit. Latest data exclude the dilaton as an alternative to the Higgs, and disfavour fits with negative Yukawa couplings. We derive for the first time the SM Higgs boson mass from the measured rates, rather than from the peak positions, obtaining $M_h = 125.0 \pm 1.8$ GeV.