Strong field effects on physics processes at the Interaction Point of future linear colliders

TL;DR

Future linear colliders with intense lepton bunches will experience strong electromagnetic fields that can influence physics processes, requiring precise theoretical understanding to ensure accurate experimental results.

Contribution

This paper reviews the current theoretical approaches to modeling strong field effects at future linear colliders, emphasizing the importance of exact methods like the Furry Picture.

Findings

Strong electromagnetic fields can affect particle interactions at colliders.

The Furry Picture provides an exact framework for strong field effects.

Ongoing theoretical developments aim to improve precision in predictions.

Abstract

Future lepton colliders will be precision machines whose physics program includes close study of the Higgs sector and searches for new physics via polarised beams. The luminosity requirements of such machines entail very intense lepton bunches at the interaction point with associated strong electromagnetic fields. These strong fields not only lead to obvious phenomena such as beamstrahlung, but also potentially affect every particle physics process via virtual exchange with the bunch fields. For precision studies, strong field effects have to be understood to the sub-percent level. Strong external field effects can be taken into account exactly via the Furry Picture or, in certain limits, via the Quasi-classical Operator method . Significant theoretical development is in progress and here we outline the current state of play.