Initial state QED radiation aspects for future $e^+e^-$ colliders

TL;DR

This paper reviews theoretical and phenomenological aspects of initial-state QED radiation for future $e^+e^-$ colliders, providing technical insights and pedagogical explanations to address upcoming challenges in collider physics.

Contribution

It offers a comprehensive overview of initial state radiation treatments and theoretical developments relevant for future $e^+e^-$ collider experiments.

Findings

Descriptions of Monte Carlo approaches to initial state radiation

Explanation of theoretical developments with potential phenomenological impact

Accessible pedagogical presentation for both experts and non-experts

Abstract

This white paper concerns theoretical and phenomenological aspects relevant to the physics of future $e^+e^-$ colliders, in particular regarding initial-state QED radiation. The contributions each contain key technical aspects, and are formulated in a pedagogical manner so as to render them accessible also to those who are not directly working on these and immediately-related topics. This should help both experts and non-experts understand the theoretical challenges that we shall face at future $e^+e^-$ colliders. Specifically, this paper contains descriptions of the treatment of initial state radiation from several Monte Carlo collaborations, as well as contributions that explain a number of more theoretical developments with promise of future phenomenological impact.