Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 15: Search for new particles I

T 15.3: Vortrag

Montag, 30. März 2020, 17:00–17:15, H-HS XVI

Searches for long-lived particles produced in Higgs decays with b-quark like signature — •Melanie Eich, Lisa Benato, Gregor Kasieczka, Karla Pena, and Jörg 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 all or some SM gauge group exists alongside additional fermions. The particles of SM and mirror group 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. It is expected that the Higgs boson decays into a pair of long- lived scalars πν.

We show results for the case that each πν decays into two b-quarks, while the lifetime of the πν is in the order of 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.

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