SMEFT Wilson coefficients are subject to various positivity bounds in order to be consistent with the fundamental principles of S-matrix. Previous bounds on dimension-8 SMEFT operators have been obtained using the positivity part of UV partial wave unitarity and form a (projective) convex cone. We implement UV unitarity conditions that go beyond positivity in an optimization scheme with...
We present results from a global fit of dimension-six SMEFT operators
that includes electroweak, Higgs-boson, top-quark, and flavor
observables. The leading-order scale dependence of the SMEFT Wilson
coefficients is consistently included in the evolution from the UV
scale to the electroweak scale and the low-energy scale of flavor
observables. The global fit is obtained within the HEPfit...
We will discuss the latest differential measurements of Higgs boson cross sections with the CMS detector in both bosonic and fermionic decay channels. Both fiducial, differential cross section measurements and measurements in the simplified template cross section framework will be presented. Both the data collected during Run 2 of the LHC and the early data collected in Run3 by the CMS...
Precision measurements of Higgs boson couplings and kinematic properties can be performed using the data collected by the ATLAS experiment, leveraging a variety of final states and production modes to probe different regions of phase space with increasing accuracy. By combining these measurements, the strengths of individual channels are maximally exploited, providing the most stringent global...
Global interpretations of particle physics data within the framework of the Standard Model Effective Field Theory (SMEFT), including their matching to UV-complete models, involve energy scales potentially spanning several orders of magnitude. Relating these measurements among them in terms of a common energy scale is enabled by the Renormalisation Group Equations (RGEs). Here we present a...
Many-parameter fits to precise measurements in the framework of the Standard Model Effective Field Theory are becoming a standard interpretation of LHC and other collider data. In this contribution an overview is given of state-of-the-art EFT interpretations in ATLAS with particular emphasis on results in the top quark sector.
Measurements of photon-induced processes are presented, using data collected in Run-2.
Measuring diboson final states is a unique opportunity at the LHC, as they provide precision tests of QCD and EW predictions at unprecedented accuracies, shedding light on the non-Abelian structure of the SM EW theory, and leading to stringent constraints on Effective Field Theory Wilson coefficients. This talk summarizes recent results from ATLAS on this topic.
The study of rare top quark production modes opens the gate to a number of new physics models that introduce large contributions to them. Among those, the production of four top quarks could be affected by the direct or indirect production of top-philic heavy resonances or be modified by anomalous Yukawa interactions between the top quark and the Higgs boson. A set of measurements is presented...
Recent results on global EFT fits of the CMS data are presented, with particular focus on the electroweak sector of the Standard Model.
The top quark plays an important role in a number of new physics models, some of which introduce violations to some of the accidental symmetries of the SM, such as the lepton number conservation or introduce additional sources of others already broken, such as the CP symmetry. A set of measurements is presented that probe violation of these symmetries in processes involving the top quark, in...
Electroweak Precision Measurements are stringent tests of the Standard Model and sensitive probes to New Physics. Accurate studies of the Z-boson couplings to the first-generation quarks, which are currently only constrained from LEP data, could reveal potential discrepancies from the theory predictions. Future $e^+e^-$ colliders running at the $Z$-pole would be an excellent tool for an...
