2015/09/30 by A. Djouadi, Abdelhak Djouadi, Jérémie Quevillon +1 · 1 citation
Physics and Astronomy · #Boson #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Electron #Electroweak interaction #Gauge (firearms) #Gauge boson #Gauge theory #Higgs boson #Higgs field #Higgs mechanism #Large Hadron Collider #Lepton #Muon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quark #Standard Model (mathematical formulation) #Technicolor #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.physletb.2016.04.014
12 pages. V2: a few clarifications have been made and some references added
arxiv created 2015/10/10 · openalex publication_date 2016/04/11 · arxiv updated 2016/05/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
With the upgrade of the LHC, the couplings of the observed Higgs particle to fermions and gauge bosons will be measured with a much higher experimental accuracy than current measurements, but will still be limited by an order 10% theoretical uncertainty. In this paper, we re-emphasize the fact that the ratio of Higgs signal rates into two photons and four leptons, ⁎ D γ γ = σ ( p p → H → γ γ ) / σ ( p p → H → Z Z ⁎ → 4 ℓ ± ) can be made free of these ambiguities. Its measurement would be limited only by the statistical and systematic errors, which can in principle be reduced to the percent level at a high-luminosity LHC. This decay ratio would then provide a powerful probe of new physics effects in addition to high precision electroweak observables or the muon g − 2 . As an example, we show that the Higgs couplings to top quarks and vector bosons can be constrained at the percent level and that new Higgs or supersymmetric particles that contribute to the H γ γ loop can be probed up to masses in the multi-TeV range and possibly larger than those accessible directly.