Abstract
We study one-loop effects induced by an anomalous Higgs trilinear coupling on total and differential rates for the Hrightarrow 4ell decay and some of the main single-Higgs production channels at the LHC, namely, VBF, VH, t{bar{t}}H and tHj. Our results are based on a public code that calculates these effects by simply reweighting samples of Standard-Model-like events for a given production channel. For VH and t{bar{t}}H production, where differential effects are particularly relevant, we include Standard Model electroweak corrections, which have similar sizes but different kinematic dependences. Finally, we study the sensitivity of future LHC runs to determine the trilinear coupling via inclusive and differential measurements, considering also the case where the Higgs couplings to vector bosons and the top quark is affected by new physics. We find that the constraints on the couplings and the relevance of differential distributions critically depend on the expected experimental and theoretical uncertainties.
Highlights
At low energy, the potential for a scalar particle of mass m H can be parametrized as a polynomial, V (H) = 1 2 m 2 H H + λ3v H 3 + λ4 + O(H 5), (1)
We study one-loop effects induced by an anomalous Higgs trilinear coupling on total and differential rates for the H → 4 decay and some of the main single-Higgs production channels at the LHC, namely, VBF, V H, ttH and t H j
We study the sensitivity of future LHC runs to determine the trilinear coupling via inclusive and differential measurements, considering the case where the Higgs couplings to vector bosons and the top quark is affected by new physics
Summary
The potential for a scalar particle of mass m H can be parametrized as a polynomial,. Limits on λ3 can be derived by two-loop effects in EW precision observables [42,43] such as the measurements of mW and of the S, T oblique parameters These studies have confirmed that indirect bounds on λ3 can be competitive with the direct ones inferred from the di-Higgs production channel. We present an automated public code for generating events including λ3 effects at one loop, allowing the study of differential effects in VBF, V H and ttH production and all the relevant Higgs decays. We scrutinize all the relevant distributions that are potentially affected by anomalous λ3 effects, presenting for the first time detailed results at the differential level for ttH production, for the H → 4 decay and for the t H j process, for which inclusive results are new. Details as regards the statistical treatment of uncertainties in the fit are collected in Appendix A
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