Abstract
We present a comprehensive study of the electroweak interactions using the available Higgs and electroweak diboson production results from LHC runs 1 and 2 as well as the electroweak precision data in terms of the dimension-six operators. Under the assumption that no new tree-level sources of flavor violation or violation of the universality of the weak current are introduced, the analysis involves 21 operators. We assess the impact of the data on kinematic distributions for the Higgs production at the LHC by comparing the results obtained by including the simplified template cross-section data with those in which only total Higgs signal strengths are considered. We also compare the results obtained when including the dimension-six anomalous contributions to order $1/{\mathrm{\ensuremath{\Lambda}}}^{2}$ and to order $1/{\mathrm{\ensuremath{\Lambda}}}^{4}$. As an illustration of the LHC potential to indirectly learn about specific forms of new physics, we adapt the analysis to constrain the parameter space for a few simple extensions of the standard model which generate a subset of the dimension-six operators at tree level.
Highlights
The large integrated luminosity accumulated by ATLAS and CMS during run 2 of the Large Hadron Collider (LHC) extended the reach of direct searches for new physics
As an illustration of the LHC potential to indirectly learn about specific forms of new physics, we adapt the analysis to constrain the parameter space for a few simple extensions of the standard model which generate a subset of the dimension-six operators at tree level
It allowed for studying some processes in more detail— e.g., differential distributions are available for the Higgs production, or new channels were employed to explore the self-interactions of the electroweak gauge bosons
Summary
The large integrated luminosity accumulated by ATLAS and CMS during run 2 of the Large Hadron Collider (LHC) extended the reach of direct searches for new physics It allowed for studying some processes in more detail— e.g., differential distributions are available for the Higgs production, or new channels were employed to explore the self-interactions of the electroweak gauge bosons. The resulting model is the so-called standard-model effective field theory (SMEFT) In this framework, dimension-six operators are the ones that can contribute to the LHC physics at the lowest order. Respecting Higgs analysis, they did not include the full updated ATLAS and CMS STXS of run 2 Higgs data, which we consider here This allows us to quantify the present impact of the Higgs kinematic distribution data by contrasting the bounds obtained using STXS with those found using only the signal-strength data.
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