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Search for Dark Matter Produced in Association with a Higgs Boson Decaying to a pair of bottom quarks with the ATLAS Detector

Abstract : A search for dark matter production in association with a Higgs boson decaying to b-quarks is performed using pp collisions at a centre-of-mass energy of √s=13TeV. The dataset has an integrated luminosity of 80fb−1 and was recorded with the ATLAS detector at the Large Hadron Collider. Selected collision events comprise large missing transverse momentum and either two b-tagged small radius jets or a single large radius jet containing two b-tagged subjets. The identification of these subjects is based on a jet algorithm where the radius parameter is shrinked as the transverse momentum increases. Also, with the help of a novel reconstruction technique, the object-based missing transverse momentum significance, it is shown that background coming from pure strong interactions can be successfully rejected. The results are interpreted in the context of a simplified model (Z′-2HDM) which describes the interaction of dark matter and standard model particles via new heavy mediator particles. Also model independent limits on the fiducial cross-section for Higgs + missing transverse momentum production are provided.
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  • HAL Id : tel-02494248, version 1

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Dilia María Portillo Quintero. Search for Dark Matter Produced in Association with a Higgs Boson Decaying to a pair of bottom quarks with the ATLAS Detector. High Energy Physics - Experiment [hep-ex]. Sorbonne Université, 2018. English. ⟨NNT : 2018SORUS208⟩. ⟨tel-02494248v1⟩

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