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T: Fachverband Teilchenphysik

T 10: Dunkle Materie und Kollider I

T 10.5: Vortrag

Montag, 25. März 2019, 17:00–17:15, S09

Search for Dark Matter produced in association with a Dark Higgs (s) with the ATLAS experiment at 13 TeV — •Fabrizio Napolitano¹ and Oleg Brandt² — ¹Kirchhoff-Institute for Physics Im Neuenheimer Feld 227 D-69120 Heidelberg — ²Kirchhoff-Institute for Physics Im Neuenheimer Feld 227 D-69120 Heidelberg

The Dark Higgs model extends the spin-1 simplified model by introducing a spontaneously broken U(1)’ gauge group with a Majorana Dark Matter (DM) particle and two mediators: a real scalar s (Dark Higgs boson) and a massive vector boson Z’. Any Dark Sector state or the Z’ mediator can radiate off a Dark Higgs boson, leading to a new production mechanism of DM at the LHC that may not be accessible with current DM searches. We discuss a search for the Dark Higgs with the ATLAS experiment, considering its resonant signature in association with missing transverse momentum. As the mass of the scalar is a free parameter of the model, we show how this affects the phenomenology and the search strategy.