Introduction to effective field theories. 3. Bloch--Nordsieck effective theory, HQET

TL;DR

This paper introduces effective field theories, focusing on the Bloch--Nordsieck approach in QED and Heavy Quark Effective Theory, explaining their roles in handling soft photon interactions and heavy quark dynamics.

Contribution

It provides an in-depth explanation of effective field theories, specifically the Bloch--Nordsieck and HQET, expanding on their theoretical foundations and applications.

Findings

Clarifies the role of soft photon interactions in QED

Details the formulation of HQET for heavy quarks

Provides theoretical insights into effective field theories

Abstract

This is a continuation of the lectures [1,2]. In this part we discuss interaction of electrons with soft photons in QED and Heavy Quark Effective Theory (HQET).