Abstract
We study the phenomenological consequences of several CP-violating structures that could arise in the Standard Model effective field theory framework. Focusing on operators involving electroweak gauge and/or Higgs bosons, we derive constraints originating from Run I LHC data. We then study the capabilities of the present and future LHC runs at higher energies to further probe associated CP-violating phenomena and we demonstrate how differential information can play a key role. We consider both traditional four-lepton probes of CP-violation in the Higgs sector and novel new physics handles based on varied angular and non-angular observables.
Highlights
One of the simplest model-independent way of analyzing deviations from the Standard Model in the properties of the Higgs boson relies on the effective field theory (EFT) language
In the light of the amount of LHC data to be recorded in the following years, it is important to consider both options of C P violation (CPV) and C P-conserving new physics Higgs-boson interactions
In order to probe the considered Wilson coefficient parameter space, we study a set of processes that are sensitive to CPV new physics effects in the electroweak sector and that are shown in Table 1, together with their dependence on the different EFT parameters
Summary
One of the simplest model-independent way of analyzing deviations from the Standard Model in the properties of the Higgs boson relies on the effective field theory (EFT) language In this approach, all new physics contributions to the Standard Model are parameterized in terms of higher-dimensional operators, the corresponding Wilson coefficients encoding the dependence on the ultraviolet completion of the Standard Model being taken as free parameters. In the light of the amount of LHC data to be recorded in the following years, it is important to consider both options of CPV and C P-conserving new physics Higgs-boson interactions The discrimination between these two kinds of effects is, only achievable once suitable observables allowing us to probe the C P nature of the Higgs couplings are considered.
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