Magic Moments: A Collaboration with John Bell

TL;DR

This paper reflects on the personal collaboration with John Bell, highlighting their joint work on nonrelativistic approximations in quantum field theory for heavy quark-antiquark systems.

Contribution

It provides a personal account and review of methods used in nonrelativistic quantum field theory for heavy quarkonium properties.

Findings

Review of nonrelativistic approximation methods

Insights into collaboration with John Bell

Application to heavy quark-antiquark bound states

Abstract

I want to give an impression of the time I spent together with John S. Bell, of the atmosphere of our collaboration and friendship. I briefly review our work, the methods of nonrelativistic approximations to quantum field theory for calculating the properties of heavy quark-antiquark bound states.