Positivity and the Topography of the SMEFT

by Nicholas Rodd (CERN)

Monday 17 Jul 2023, 14:30 → 16:00 Europe/Rome

Aula Conversi (Dip. di Fisica - Edificio G. Marconi)

If the UV completion of the Standard Model is unitary, local, and causal, then a rigid structure emerges in the IR description of the physics provided by the SMEFT. In this talk I will outline how these restrictions emerge, describe how they apply to the SMEFT, and detail the experimental implications, including for existing collider searches. The constraints require the positivity of various SMEFT Wilson coefficients, but also require a deep connection between effects that conserve and violate flavor and CP in the theory. While most of the results I will present are for the SMEFT at dimension eight, I will also describe the steps and additional assumptions required to unravel its structure at dimension six.