Kavli Affiliate: Tom Melia, Hitoshi Murayama
| First 5 Authors: Simone Alioli, Radja Boughezal, Weiguang Cao, Gauthier Durieux, Lukáš Gráf
| Summary:
In this contribution to the Snowmass 2021 process we review theoretical
developments in the Standard Model Effective Field Theory (SMEFT) with a focus
on effects at the dimension-8 level and beyond. We review the theoretical
advances that led to the complete construction of the operator bases for the
dimension-8 and dimension-9 SMEFT Lagrangians. We discuss the possibility of
obtaining all-orders results in the $1/Lambda$ expansion for certain SMEFT
observables, and briefly present the on-shell approach to constructing SMEFT
amplitudes. Finally we present several new phenomenological effects that first
arise at dimension-8 and discuss the impact of these terms on experimental
analyses.
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