Effective Field Theory after a New-Physics Discovery

Abstract

After the discovery of a new resonance, its couplings to the Standard Model (SM) need to be described by the means of an effective theory, appropriately constructed to separate its mass scale from the mass scales associated with the SM decay products. At the example of a scalar resonance transforming as a singlet under the SM gauge group, we construct the operator basis for such a theory using the language of Soft-Collinear Effective Theory (SCET) and perform the resummation of the leading Sudakov logarithms.