New physics searches at the ILC positron and electron beam dumps

TL;DR

This paper evaluates the ILC beam dump experiment's potential to detect new physics particles like dark photons and axion-like particles, highlighting the superior sensitivity of the positron beam dump over previous experiments.

Contribution

It provides a comparative analysis of electron and positron beam dumps at the ILC for new physics searches, including all relevant production mechanisms.

Findings

ILC beam dump has higher sensitivity than past experiments.

Positron beam dump slightly outperforms electron beam dump for certain particles.

All key production mechanisms are considered in the analysis.

Abstract

We study capability of the ILC beam dump experiment to search for new physics, comparing the performance of the electron and positron beam dumps. The dark photon, axion-like particles, and light scalar bosons are considered as new physics scenarios, where all the important production mechanisms are included: electron-positron pair-annihilation, Primakoff process, and bremsstrahlung productions. We find that the ILC beam dump experiment has higher sensitivity than past beam dump experiments, with the positron beam dump having slightly better performance for new physics particles which are produced by the electron-positron pair-annihilation.