Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 10: Suche nach Dunkler Materie 1 (LHC)

T 10.4: Talk

Monday, March 27, 2017, 17:30–17:45, VSH 116

From the trigger to model-independent limits: A search for Dark Matter produced in association with a Higgs boson decaying to a pair of b−quarks with the ATLAS detector at √s = 13 TeV using 36 fb⁻¹ of data — •Stanislav Suchek and Oleg Brandt — Kirchhoff-Institut für Physik, Universität Heidelberg

Cosmological observations combined with the recent discovery of the Higgs boson motivate collider-based searches for new physics models, where Dark Matter is produced in association with a Higgs boson. This search focuses on the signature of a pair of b−quarks from the Higgs boson decay and missing transverse momentum from Dark Matter particle(s). One of the challenges of this analysis is the missing transverse energy trigger. Its performance in 36 fb⁻¹ of data collected by the ATLAS detector in 2015 and 2016 is studied. A particular focus is placed on the low missing transverse energy region, where triggers are not fully efficient, and Monte Carlo-to-data corrections are derived. Furthermore, trigger efficiencies are calculated for different signal models, such as Z^′-2HDM and effective field theories. In case of no significant excess, model-independent limits at 95% confidence level on σ × A × є, the combination of production cross-section of potential new physics processes, detector acceptance, and the reconstruction efficiency, will be presented for different missing transverse energy regions.