# Constraints on New Scalar and Vector Mediators from LHC Dijet Searches

## TL;DR

This paper reanalyzes LHC dijet search results to constrain scalar and vector mediators in dark matter models, projects future sensitivities, and explores angular variables for distinguishing mediator types, especially for spin 0 cases.

## Contribution

It provides the first systematic study of angular information to discriminate mediator types in dijet searches, including projections for HL-LHC.

## Key findings

- No evidence for dijet signals in the simplified models.
- Higher luminosity improves sensitivity, especially for heavy mediators.
- Angular separation can help distinguish different mediator scenarios.

## Abstract

We present a reanalysis of the latest results from CMS dijet searches for an integrated luminosity of $36\,$fb$^{-1}$ together with preliminary results for $78\,$fb$^{-1}$ in the framework of simplified models for dark matter interacting with quarks through the exchange of a scalar, pseudoscalar, vector or pseudovector mediator particle. Within the same framework, we also project the sensitivity of dijet searches in future LHC runs and study how well the parameters of a simplified model could be reconstructed in case of a future discovery at the high luminosity (HL) LHC. Finally, we explore the possibility of discriminating different mediator scenarios by extending the sensitivity of dijet searches for simplified models through the use of angular information. It is the first time that these studies are performed systematically for the case of spin 0 mediators. Among other results we find: 1) no evidence for a dijet signal in the simplified model framework; 2) improvements due to an increased luminosity at the HL-LHC are significant, but mostly for heavy mediators, where dijet searches are limited by statistical, rather than systematical uncertainties; 3) Information on the angular separation of dijets could be used at the HL-LHC to discriminate different mediator scenarios.