Traces of resonances in electroweak effective Lagrangians

Current and future constraints on Higgs couplings in the nonlinear Effective Theory

“…Indeed, the EFT formalism provides a robust theoretical framework where both physical calculations and the connection with UV scenarios can be performed in a well-defined manner. On the one hand, EFTs can be connected easily to a given UV-model when the heavy degrees of freedom are integrated out [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. On the other hand, the precision of the predictions computed with the effective Lagrangian can be systematically improved by including higher orders of both, the EFT expansion as well as perturbation theory.…”

“…This is what we will define as our ewχL in section 2. The same hypotheses have been referred to in the recent literature as the Higgs Effective Field Theory (HEFT) [7,36] or electroweak effective theory [21,26,37].…”

Effective description of general extensions of the Standard Model: the complete tree-level dictionary

“…Note that the intermediate effective theory can be weakly interacting even if it arises from a stronglycoupled theory. One example of this is provided by composite Higgs theories in the large-N limit.3 A related effort for the case of the electroweak chiral Lagrangian, in which the Higgs boson is a scalar singlet of the non-linearly realized electroweak symmetry is currently underway[21,22].…”