Decoding Higgs Boson Branching Ratios from event shapes

Institute for Particle Physics Phenomenology, Durham University, Durham DH1 3LE, UK, Now at CERN, Theoretical Physics Department, CH-1211 Geneva 23, Switzerland

^* e-mail: d.reichelt@cern.ch

Published online: 18 December 2024

Abstract

This contribution will discuss a novel strategy for the simultaneous measurements of Higgs boson branching ratios into gluons and light quarks at a future lepton collider, operating in the Higgs-factory mode. The method is based on template fits to global event-shape observables, and in particular fractional energy correlations, thereby exploiting differences in the QCD radiation patterns of quarks and gluons. This approach is orthogonal to measurements based on traditional tagging methods based mainly on displaced vertices and allows for an extraction of limits on both Higgs boson to gluon- and light quark branching ratios separately. Additionally, state-of-the-art calculations for the relevant observables are commented on.