Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 61: Search for New Particles III
T 61.9: Vortrag
Mittwoch, 17. März 2021, 18:00–18:15, Tk
Searches for long-lived particles produced in Higgs decays with b-quark like signature — •Melanie Eich, Lisa Benato, Gregor Kasieczka, Karla Pena, and Joerg Schindler — Institut für Experimentalphysik, Universität Hamburg
Beyond Standard Model (BSM) theories including neutral, long-lived particles (LLP) can solve the hierarchy problem. In these theories, a mirror version of SM gauge groups exists alongside additional fermions. SM and mirror particles are connected via a discrete symmetry. In our analysis the Higgs boson is assumed to be the mediator between the two groups, because it mixes with its mirror partner. We further assume Higgs boson decays into a pair of long-lived neutral scalars πν.
We show results for the case that each πν decays into two b-quarks, with πν lifetimes measured as c · τ in the order of up to a few millimetres. Such a lifetime results in a displaced vertex (DV), mimicking a b-quark like signature. The search for such πν requires new analysis techniques to distinguish between decay products coming from DV and background events. We present a comparison of different reconstruction techniques including machine learning methods and show the achievable sensitivity to twin Higgs production as a function of the mass and lifetime of the πν. In this talk an overview of the analysis and its current status and results will be presented, using data recorded with the CMS detector in Run2.