Pre-published on:
September 01, 2023
Published on:
January 22, 2025
Abstract
These lecture notes on Effective Field Theories (EFTs) cover the basic notions of EFTs from the renormalization group point of view. After a detailed discussion of a simple 1D Ising theory of spins on a circle we construct the Standard Model (SM) Lagrangian using only the known symmetries and the fields content of this model. Various problems of the SM are classified by the dimension of the corresponding operators built from the SM fields. Solutions to these problems are sketched leading to the various extensions of the SM.