Abstract
We study the indirect effects of New Physics in the Higgs decay into four charged leptons, using an Effective Field Theory (EFT) approach to Higgs interactions. We evaluate the deviations induced by the EFT dimension-six operators in observables like partial decay width and various kinematic distributions, including angular observables, and compare them with the contribution of the full SM electroweak corrections. The calculation is implemented in an improved version of the event generator Hto4l, which can provide predictions in terms of different EFT-bases and is available for data analysis at the LHC. We also perform a phenomenological study in order to assess the benefits coming from the inclusion of differential information in the future analyses of very precise data which will be collected during the high luminosity phase of the LHC.
Highlights
Well separated from the energy scale of the SM spectrum
We study the indirect effects of New Physics in the Higgs decay into four charged leptons, using an Effective Field Theory (EFT) approach to Higgs interactions
In the present work we have investigated possible NP effects in the Higgs decay into four charged leptons using an EFT approach to Higgs interactions
Summary
The EFT approach is based on the hypothesis that the scale Λ of NP is much heavier than the EW scale. It has been argued that the coefficients of this parametrization of NP can be obtained as a linear transformation from any other basis These transformations are chosen in order to map particular combinations of Wilson coefficients of a given basis into a subset of anomalous couplings of the mass-eigenstates Lagrangian extended to D = 6 operators. In this scenario, the coefficients for the contact interactions are constrained by the EW precisions tests performed at LEP and their effects are expected to be rather small. One would be sensitive to such a contact term in the kinematic region where the 4 invariant mass is much higher than the Higgs mass which is not the case in the on-shell decay of the Higgs boson
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