Speaker
Description
The LHC has established a clear mass gap between the Standard Model particles and possible new states, making effective field theory the natural framework to search for indirect signals of new physics. We adopt the HEFT, the electroweak effective theory in its nonlinear realization, where the Higgs is treated as a singlet with independent couplings. At higher energies we describe possible heavy bosonic states through a generic resonance Lagrangian. After integrating out these resonances and imposing proper short-distance constraints, the bosonic low-energy constants can be given in terms of resonance masses. Using updated experimental inputs, we have reanalyzed these constraints and find stronger bounds than in our previous studies, pushing the allowed resonance masses higher. This bottom-up approach shows how increasingly precise low-energy data can sharpen our picture of the high-energy dynamics beyond the Standard Model.