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T: Fachverband Teilchenphysik

T 94: Supersymmetry: Searches

T 94.8: Vortrag

Freitag, 3. April 2020, 12:45–13:00, H-HS V

Search for top squarks with one-lepton final states in √s = 13 TeV pp collisions with the ATLAS detector — •Zulit Paola Arrubarrena Tame and Alexander Mann for the ATLAS collaboration — Ludwig-Maximilians-Universität München

Supersymmetry (SUSY) is an extension of the standard model of particle physics which predicts a supersymmetric partner for each particle in the standard model. If R-parity is conserved, then the lightest supersymmetric particle (LSP) is stable and a good dark matter candidate. In many models the LSP is favored to be the lightest neutralino (χ₁⁰), and the SUSY partner of the top quark, top squark (t₁), is usually assumed to be light and in the reach of the LHC. In this talk a search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum using pp collision data recorded by the ATLAS detector over the full Run 2 of the LHC is presented.
The latest results of an analysis targeting a compressed region of the top-squark phase space are shown where the mass difference between the t₁ and χ₁⁰ is smaller than the W-boson. In this scenario the t₁ decays via a 4-body process into a b-quark, two soft fermions and a χ₁⁰. A strategy to discriminate the SUSY signal from the dominant top-quark and W+jets background processes is described.