New physics searches at the ILC positron and electron beam dumps

Kento Asai,Sho Iwamoto,Daiki Ueda,Yasuhito Sakaki

doi:10.1007/jhep09(2021)183

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.

Highlights

New physics searches at the ILC positron and electron beam dumps (a) Pair-annihilation processes are caused by a positron in the beam or in an electromagnetic shower
In the positron beam dump experiment for ma ≤ O(10−1 ) GeV, and the electron beam dump experiment, the electromagnetic shower is dominant in the positron track length, and the number of events in the small coupling regions is approximately calculated as and θ1 is still greater than θ2 and θ3
To describe electromagnetic showers in material, it is useful to utilize the track length li of a particle i, which is defined by the total flight length of the particles i produced in the shower, including the primary track itself if i is the incident particle

Summary

Introduction

New physics searches at the ILC positron and electron beam dumps (a) Pair-annihilation processes are caused by a positron in the beam or in an electromagnetic shower. We evaluate the sensitivity of the ILC electron and positron beam dump experiments to the new light particles using the formula provided in the previous section. O(10−1 ) GeV, and the electron beam dump experiment, the electromagnetic shower makes dominant in the positron track length.

Results

Conclusion