Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 53: Suche nach Neuen Teilchen III

T 53.10: Talk

Wednesday, March 27, 2019, 18:15–18:30, H07

Searches for long-lived particles produced in Higgs decays with b-quark like signature — •Melanie Eich, Lisa Benato, Zhiyuan He, Gregor Kasieczka, and Karla Pena — Institut für Experimentalphysik, Universität Hamburg

Beyond Standard Model (BSM) theories including electrically 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 seen as a 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.

In this analysis each πν is expected to decay into two b-quarks, while the lifetime of the πν is in the order of a few millimeters. Such a lifetime result 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. In this talk an overview of the reconstruction techniques and the current analysis status is presented, using data recorded with the CMS detector in 2016.