Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 79: Dunkle Materie und Kollider II

T 79.10: Talk

Thursday, March 28, 2019, 18:15–18:30, H09

Estimation of the QCD multi-jet background for a search of Br(H → invisible) in vector boson fusion processes. — •Arthur Linss — DESY, Hamburg, Germany

One of the most important shortcomings of the Standard Model of elementary particle physics is the absence of a Dark Matter (DM) particle candidate. One promising channel for the search for DM at the LHC in context of Higgs portal models provides the Higgs to invisible decay. One of the most sensitive channels is targeting vector boson fusion production, resulting in signatures of missing transverse energy (MET) and two forward jets in different hemispheres of the detector. While the main background for this channel is the decay of a Z boson to two neutrinos, the QCD multi-jet background is also important and must be treated with care. This talk deals with the description and possible improvements of the QCD multi-jet background. The focus will be on the faking of MET by jets via a jet mis-measurement and via a wrong pile-up jet identification.