Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 95: Searches for Dark Matter III

T 95.9: Talk

Thursday, March 18, 2021, 18:00–18:15, Tt

Detector corrected Dark Matter search with jets and missing transverse energy with the ATLAS experiment — •Martin Klassen — Kirchhoff-Institut für Physik, Heidelberg

Dark Matter (DM) could reveal itself within the ATLAS detector as a signature of missing transverse energy (MET) accompanied by at least one energetic jet. These jets can either originate from initial or final state radiation or can be relics from vector-boson-fusion (VBF) production leading to two distinct signal regions. An irreducible background results from Standard Model (SM) processes for which the Z boson decays into a pair of neutrinos. Hence, a DM search can be performed by studying deviations from the SM prediction of the cross-sections of those measured invisible Z bosons decays. Experimental and theoretical uncertainties are constrained by dedicated control. The result of the measurement is corrected for detector effects. To search for new physics, the detector-correction signal region and control regions are simultaneously fit to the data, including all systematic uncertainties. Multiple observables such as MET, the invariant mass as well as the difference between the azimuthal angle of the two jets with the largest transverse momenta in the VBF phase space are included in this fit. This talk discusses the simultaneous fit and limiting setting for new physics models.