Kinematical Observables in Semi-Invisible Decays

TL;DR

This paper introduces a general method for analyzing collider processes with invisible particles, proposing two complementary kinematical observables that remain effective even with low signal-to-background ratios.

Contribution

The paper presents a novel approach with two new observables for studying invisible particle processes, applicable across various scenarios and robust against low significance.

Findings

The observables effectively probe production kinematics in different regions.

They remain useful even when the signal significance is low.

The approach is demonstrated through three example cases.

Abstract

Invisible particles frequently appear in final state in studying physics at colliders. Experimental precision is also low in measuring missing energy. In this paper, we propose a general approach for studying process involving invisible particles. We provided two kinematical observables which are sensitive to production kinematics in different regions, and hence are complementary. Usage of our approach is illustrated by three examples. It is shown that our observables are still useful in case of that the significance S/B is relatively low.