Extending constraints on masses of dark matter from decays involving leptoquarks using CONTUR

Abstract

The Leptoquark Dark Matter model is a simple extension of the Standard Model which presents three new particles—a scalar boson leptoquark S₁, a Dirac fermion dark particle χ₁, and a Majorana fermion dark particle χ₀ which is the main dark matter candidate. Herwig 7.2.3 was used to simulate hard processes resulting to a χ₁ pair decaying to a dark matter χ₀, charm quark, and a tau-lepton, where the masses of S₁ and χ₀ are varied from 50–2000 GeV. For each mass pair, 1000 events were generated and validated through \textsc{CONTUR 2.3.0}. Leptoquark masses of 500–2000 (400–2000) GeV decaying to dark matter masses of 150–250 (100–500) GeV are excluded at 95% (68%) confidence level by the ATLAS_13_METJET, ATLAS_13_JETS, and CMS_13_JETS analysis pools. These analysis pools were the sensitive ones because the final states of these experimental analysis pools closely resemble the final states of the hard processes simulated in this study.