Dimension-8 Operators in the Standard Model Effective Field Theory

Abstract

We present a complete basis of dimension-8 operators in the Standard Model Effective Field Theory. Attention is paid to operators that vanish in the absence of flavor structure. The 44,807 operators are encoded in 1,029 Lagrangian terms. We also briefly discuss a few aspects of phenomenology involving dimension-8 operators, including light-by-light scattering and electroweak precision data.Comment: 50 pages, 21 tables; v4: added missing contribution to matching in Eq. (5.19). T parameter calculation unchange