Updated Global Analysis of Higgs Couplings

TL;DR

This paper provides a comprehensive global analysis of the Higgs boson's couplings, confirming they align with Standard Model predictions in sign, mass dependence, and scale, and constrains possible deviations and invisible decays.

Contribution

It offers the most precise assessment to date of Higgs couplings, confirming their consistency with Standard Model expectations and providing new constraints on non-standard interactions.

Findings

Higgs couplings have the same sign as in the Standard Model.

Couplings depend linearly on particle masses within a few percent.

Constraints on invisible Higgs decays and loop-induced couplings.

Abstract

There are many indirect and direct experimental indications that the new particle H discovered by the ATLAS and CMS Collaborations has spin zero and (mostly) positive parity, and that its couplings to other particles are correlated with their masses. Beyond any reasonable doubt, it is a Higgs boson, and here we examine the extent to which its couplings resemble those of the single Higgs boson of the Standard Model. Our global analysis of its couplings to fermions and massive bosons determines that they have the same relative sign as in the Standard Model. We also show directly that these couplings are highly consistent with a dependence on particle masses that is linear to within a few %, and scaled by the conventional electroweak symmetry-breaking scale to within 10%. We also give constraints on loop-induced couplings, on the total Higgs decay width, and on possible invisible decays of the Higgs boson under various assumptions.