Collisions involving antiprotons and antihydrogen: an overview

TL;DR

This paper reviews experimental and theoretical research on antiproton and antihydrogen collisions with atoms and molecules, highlighting the lack of experimental data at low energies and comparing various theoretical models for estimating collision rates.

Contribution

It provides a comprehensive overview of existing theoretical calculations and discusses simple approximation methods for low-energy collision estimates.

Findings

Limited experimental data at energies below 1 keV

Various theoretical models compared for accuracy and sophistication

Simple approximations effectively estimate collision rates at low energies

Abstract

I give an overview of experimental and theoretical results for antiproton and antihydrogen scattering with atoms and molecules (in particular H, He). At low energies ($\lesssim1$~keV) there are practically no experimental data available. Instead I compare the results from different theoretical calculations, of various degrees of sophistication. At energies up to a few 10:s of eV, I focus on simple approximations that give reasonably accurate results, as these allow quick estimates of collision rates without embarking on a research project.