Search for non-resonant production of semi-visible jets using Run 2 data in ATLAS

Semi-visible jets, with a significant contribution to the event's missingtransverse momentum, can arise in strongly interacting dark sectors. Thisresults in an event topology where one of the jets can be aligned with thedirection of the missing transverse momentum. The first search for semi-visiblejets produced via a $t$-channel mediator exchange is presented. The analysisuses proton-proton collisions with an integrated luminosity of 139 fb$^{-1}$and a centre-of-mass energy of 13 TeV, collected with the ATLAS detector duringthe Run 2 of the LHC. No excess over Standard Model predictions is observed.Assuming a coupling strength of unity between the mediator, a Standard Modelquark and a dark quark, mediator masses up to 2.7 TeV are excluded at the 95%confidence level. Upper limits on the coupling strength are also derived.