Speaker: Nicholas Rodd
Title: Consistency of the Standard Model Effective Field Theory
Host: Da Liu
Zoom: https://zoom.us/j/186024391
Abstract:
In this talk I will describe how causality and the analytic structure of scattering amplitudes impose non-trivial constraints on the standard model effective field theory (SMEFT). For example, in the bosonic sector, I will explain how the bounds imply restrictions on the size of certain CP-odd operators by associated CP-even couplings. This result can be exploited to reveal a connection between constraints derived at colliders and limits on the neutron electric dipole moment. Further, I will demonstrate that in the fermionic sector, IR consistency requires that flavour violating dimension 8 operators are bounded by the flavour conserving variants. I will review how these bounds arise generally, and demonstrate how they are satisfied by a wide variety of UV completions.
