Using Single Photons for WIMP Searches at the ILC

TL;DR

This paper develops a likelihood-based analysis method for single-photon events at the ILC to search for neutralino pair production, providing a way to determine the cross section needed for detection across various masses.

Contribution

It introduces a novel likelihood analysis technique utilizing full event information for single-photon processes at the ILC, specifically applied to neutralino searches in supersymmetry.

Findings

Determines the cross section thresholds for neutralino detection from 100 to 250 GeV.

Develops a likelihood method that enhances sensitivity in single-photon event analysis.

Provides a framework for future supersymmetry searches at the ILC.

Abstract

We consider analysis targets at the International Linear Collider in which only a single photon can be observed. For such processes, we have developed a method which uses likelihood distributions using the full event information (photon energy and angle). The method was applied to a search for neutralino pair production with a photon from initial state radiation (ISR) in the case of supergravity in which the neutralino is the lightest supersymmetric particle. We determine the cross section required to observe the neutralino pair production with ISR as a function of the neutralino mass in the range of 100 to 250 GeV.