Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 55: Search for new particles III

T 55.4: Vortrag

Mittwoch, 1. April 2020, 17:15–17:30, H-HS XVI

Search for a long-lived particle in b→ s transitions at Belle II — •Sascha Dreyer for the Belle II collaboration — DESY Hamburg

The Belle II experiment at the asymmetric e+ e- SuperKEKB collider in Tsukuba, Japan can be used for B-physics studies as well as searches for dark sectors. A hypothetical new long-lived scalar particle that mixes with the Standard Model Higgs boson could serve as a mediator to dark sectors. This scalar particle could be produced in b→ s transitions and decay to a pair of charged Standard Model particles with a vertex displaced from the interaction point. Photons interacting with the detector material and converting to an e+ e- pair before reaching the calorimeter feature a similar topology. Studying this process is important to understand possible backgrounds as well as reconstruction efficiencies for this search. This talk gives an overview of the search for a new long-lived scalar particle at Belle II including a study of photon conversions.