Dortmund 2021 – wissenschaftliches Programm
T 87.9: Vortrag
Donnerstag, 18. März 2021, 18:00–18:15, Tl
Exploring the 0L channel in the search for dark matter produced in association with a single top quark — •Paul Moder1, Claudia Seitz1, Ben Brüers2, and Alvaro Lopez Solis2 — 1DESY Hamburg — 2DESY Zeuthen
While the Standard Model (SM) is very effective in describing most of the observations in particle physics, there are still effects that remain unexplained. One of these mysteries is the existence of dark matter (DM) in the universe although it is assumed to make up around 80% of the existing matter. With the construction of the LHC and the discovery of the Higgs boson in 2012, completing the SM, a lot of searches were focused on possible final states with DM, which can only be detected indirectly through missing transverse energy. One particular scenario of interest is a model where a mediator is added to the 2 Higgs doublet model (2HDM). The 2HDM assumes a second Higgs doublet in addition to the one in the SM, resulting in a total of five Higgs bosons. The additional mediator couples both to the 2HDM and the DM sector, making it possible to create dark matter at the LHC. A number of final states is explored in this model, one of them containing a top quark, a W-boson and dark matter. This final state was previously explored in two analysis channels, one with 1 lepton and one with 2 leptons in the final state. This talk presents a new, orthogonal 0 lepton channel in the same final state and will focus on its challenges and possiblities, discuss a preliminary signal region and compare its sensitivity to the already existing analysis.