Quark Lagrangian diagonalization versus non-diagonal kinetic terms

TL;DR

This paper discusses how loop corrections affect the diagonalization of the Standard Model Lagrangian and demonstrates that counterterms can resolve the resulting complications.

Contribution

It introduces a method to handle non-diagonal kinetic terms induced by loop corrections through the use of counterterms.

Findings

Counterterms effectively restore diagonalization of the Lagrangian

Loop corrections depend on momentum squared, complicating diagonalization

A systematic approach to counterterms is proposed

Abstract

Loop corrections induce a dependence on the momentum squared of the coefficients of the Standard Model Lagrangian, making highly non-trivial (or even impossible) the diagonalization of its quadratic part. Fortunately, the introduction of appropriate counterterms solves this puzzle.