Original paper
Flavor Constraints from Unitarity and Analyticity
Abstract
We use unitarity and analyticity of scattering amplitudes to constrain fermionic operators in the standard model effective field theory. For four-fermion operators at mass dimension 8, we scatter flavor superpositions in fixed standard model representations and find the Wilson coefficients to be constrained so that their contraction with any pair of pure density matrices is positive. These constraints imply that flavor-violating couplings are...
Paper Details
Title
Flavor Constraints from Unitarity and Analyticity
Published Date
Aug 19, 2020
Journal
Volume
125
Issue
8