Into the multi-TeV scale with a Higgs golden ratio

Abstract

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, $D_{\gamma \gamma }=\sigma (pp\to H\to \gamma \gamma )/\sigma (pp\to H\to Z{Z}^{\ast }\to 4{\ell }^{\pm })$ 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$\gamma \gamma$ loop can be probed up to masses in the multi-TeV range and possibly larger than those accessible directly.

12 pages. V2: a few clarifications have been made and some references added

References in corpus (7)

• Big-Bang Nucleosynthesis
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Higgs boson gluon-fusion production in N3LO QCD
• Implications of the Higgs Boson Discovery for mSUGRA
• New Observables for CP Violation in Higgs Decays
• Probing the Higgs Couplings to Photons in $h\to 4\ell$ at the LHC
• New Opportunities in $h\to 4\ell$

Cited by in corpus (12)

• Scenarii for interpretations of the LHC diphoton excess: two Higgs doublets and vector-like quarks and leptons
• The Universal One-Loop Effective Action
• Prospects for Higgs physics at energies up to 100 TeV
• Vector-like top/bottom quark partners and Higgs physics at the LHC
• Doubling Up on Supersymmetry in the Higgs Sector
• Search for single production of vector-like top partners at the Large Hadron Electron Collider
• Search for single production of the heavy vectorlike $T$ quark with $T\to th$ and $h\to \gamma \gamma$ at the high-luminosity LHC
• Golden Probe of Electroweak Symmetry Breaking
• The Supersymmetric Georgi-Machacek Model
• Adding Pseudo-Observables to the Four-Lepton Experimentalist's Toolbox
• The hMSSM with a Light Gaugino/Higgsino Sector: Implications for Collider and Astroparticle Physics
• Is there new particle running in the loop-induced $H\gamma \gamma$ and $Hgg$ vertex?