Search for supersymmetry in final states with missing transverse momentum and charm-tagged jets using 139 fb-1 of proton-proton collisions at SQUARE ROOTs = 13 TeV with the ATLAS detector

Abstract

The paper presents a search for supersymmetric particles produced in protonprotoncollisions at √s = 13TeV and decaying into final states with missing transversemomentum and jets originating from charm quarks. The data were taken with the ATLASdetector at the Large Hadron Collider at CERN from 2015 to 2018 and correspond to anintegrated luminosity of 139 fb−1. No significant excess of events over the expected StandardModel background expectation is observed in optimized signal regions, and limits are seton the production cross-sections of the supersymmetric particles. Pair production of charmsquarks or top squarks, each decaying into a charm quark and the lightest supersymmetricparticle ˜χ01, is excluded at 95% confidence level for squarks with masses up to 900 GeV forscenarios where the mass of ˜χ01is below 50 GeV. Additionally, the production of leptoquarkswith masses up to 900 GeV is excluded for the scenario where up-type leptoquarks decayinto a charm quark and a neutrino. Model-independent limits on cross-sections and eventyields for processes beyond the Standard Model are also reported.