Higher-Order QCD prediction for dark matter pair associated with a b-jet production at the LHC

TL;DR

This paper presents a next-to-leading order QCD prediction for dark matter pair production with a b-jet at the LHC, highlighting significant QCD corrections and assessing discovery potential.

Contribution

It introduces a detailed NLO QCD calculation for dark matter plus b-jet production using simplified models and evaluates the discovery prospects at 13TeV LHC.

Findings

QCD corrections can double the leading-order results.

The process has a sizeable cross section at the LHC.

Potential for dark matter discovery at 13TeV.

Abstract

Dark matter associated visible particle production at high energy colliders provides a unique way to determine the microscopic properties of the dark matter. We investigate a pair of fermionic dark matter particles associated with a b-jet production at the LHC, through a mediator which couples to standard model or dark matter particles via either a vector or axial-vector coupling. The calculation is performed by implementing these simplified models in the FeynRules/MadGraph5 aMC@NLO framework. In our calculation, next-to-leading order QCD corrections and parton-shower effects are considered. We find that this process has a sizeable cross section and the QCD correction can reach more than 2 times than LO results. We also investigate the discovery potential in several benchmark scenarios at the 13TeV LHC.