Constraining resonances by using the electroweak effective theory

Abstract

In the light of the mass gap between Standard Model (SM) states and possible new particles, effective field theories are a suitable approach. We take on the non-linear realization of the electroweak symmetry breaking: the electroweak effective theory (EWET), also known as Higgs effective field theory (HEFT) or electroweak chiral Lagrangian (EWChL). At higher scales we consider a resonance electroweak Lagrangian, coupling SM fields to resonances. Integrating out these resonances and assuming a well-behaved high-energy behavior, some of the bosonic low-energy constants are determined or constrained in terms of resonance masses. Present experimental bounds on these low-energy constants allow us to push the resonance mass scale to the TeV range, $M_R\ge 2$TeV, in good agreement with previous estimations.

Comments: 6 pages, 1 figure, 1 table. Talk given at the 40th International Conference on High Energy Physics - ICHEP2020 (28 July - 6 August, 2020, virtual meeting, Prague, Czech Republic)