Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 53: Suche nach Neuen Teilchen III

T 53.7: Vortrag

Mittwoch, 27. März 2019, 17:30–17:45, H07

Search for long-lived particle decays in the CMS tracking system — Lisa Benato, Melanie Eich, Zhiyuan He, Gregor Kasieczka, and •Karla Pena — Institut für Experimentalphysik, Universität Hamburg

Twin Higgs models propose the existence of a dark sector, neutral under all SM gauge groups. Interaction between the dark sector and the SM is mediated solely by the Higgs boson, which mixes with its dark partner. As a consequence of this, the Higgs boson is predicted to decay to non-SM particles. Scenarios are considered where the Higgs boson decays into a pair of dark long-lived particles (LLPs), each of which travels a macroscopic distance before decaying back to a pair of SM particles—predominantly b quarks.

Decays occurring within the CMS tracking system result on displaced-vertex signatures, which can be observed with almost no SM background. However, as conventional track reconstruction and vertex finding algorithms are optimized for prompt decays, these signatures are very challenging to find and advanced tracking reconstruction techniques are required. A benchmark analysis is performed, where information from reconstructed tracks is used to tag jets whose origin is significantly displaced with respect to the primary vertex.

The status of a search for LLPs decaying in the CMS tracker is presented, using data collected by the CMS detector in 2016 pp collisions at √s=13 GeV.