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Article Dans Une Revue Physics Letters B Année : 2016

Into the multi-TeV scale with a Higgs golden ratio

Résumé

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, $D_{\gamma \gamma}= \sigma(pp\to H \to \gamma \gamma)/\sigma(pp\to H \to ZZ^* \to 4\ell^\pm)$ 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.

Dates et versions

hal-02898127 , version 1 (13-07-2020)

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Abdelhak Djouadi, Jérémie Quevillon, Roberto Vega-Morales. Into the multi-TeV scale with a Higgs golden ratio. Physics Letters B, 2016, 757, pp.412-419. ⟨10.1016/j.physletb.2016.04.014⟩. ⟨hal-02898127⟩
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