# The motivation and status of two-body resonance decays after the LHC Run 2 and beyond

## TL;DR

This paper reviews the current status of two-body resonance decay searches at the LHC, emphasizing the gaps in coverage for non-Standard Model particles and advocating for comprehensive future search strategies.

## Contribution

It highlights the existing gaps in two-body resonance decay searches, especially for non-SM particles, and advocates for a combined approach of dedicated and model-agnostic searches in future experiments.

## Key findings

- Many SM particle decay channels are well-covered.
- Significant gaps remain in non-SM particle decay searches.
- Future strategies should combine dedicated and model-agnostic approaches.

## Abstract

Searching for two-body resonance decays is a central component of the high energy physics energy frontier research program. While many of the possibilities are covered when the two bodies are Standard Model (SM) particles, there are still significant gaps. If one or both of the bodies are themselves non-SM particles, there is very little coverage from existing searches. We review the status of two-body searches and motivate the need to search for the missing combinations. It is likely that the search program of the future will be able to cover all possibilities with a combination of dedicated and model agnostic search approaches.