Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 101: BSM Higgs 4

T 101.6: Talk

Thursday, March 7, 2024, 17:15–17:30, Geb. 30.41: HS 3

Search for Higgs boson decays into long-lived particles with displaced vertices — Lisa Benato, Karim El Morabit, Gregor Kasieczka, and •Karla Peña — Institut für Experimentalphysik, Universität Hamburg

Higgs-portal models propose the existence of a dark sector, neutral under all Standard Model (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 also in the dark sector. 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 background from the SM. However, as conventional tracking and vertex finding algorithms are optimized for prompt decays, these signatures are challenging to find and advanced reconstruction techniques are required. This talk presents a search for LLPs using data collected by the CMS detector in pp collisions at a center-of-mass energy of 13 GeV.