Coupling spans of the Higgs-like boson

TL;DR

This paper constrains the total width and couplings of the Higgs-like boson using collider data, providing limits on exotic decay modes and refining our understanding of its properties.

Contribution

It introduces new bounds on the Higgs boson's total width and couplings based on experimental data, assuming Standard Model-like couplings to W and Z bosons.

Findings

Upper limit on Higgs total width established

Constraints on Higgs couplings to particles derived

Upper limit of 47% on exotic decay branching fraction

Abstract

Using the LHC and Tevatron data, we set upper and lower limits on the total width of the Higgs-like boson. The upper limit is based on the well-motivated assumption that the Higgs coupling to a W or Z pair is not much larger than in the Standard Model. These width limits allow us to convert the rate measurements into ranges for the Higgs couplings to various particles. A corollary of the upper limit on the total width is an upper limit on the branching fraction of exotic Higgs decays. Currently, this limit is 47% at the 95% CL if the electroweak symmetry is broken only by doublets.