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T: Fachverband Teilchenphysik

T 63: Search for New Particles 4

T 63.1: Vortrag

Mittwoch, 23. März 2022, 16:15–16:30, T-H22

Search for a long-lived particle in b→ s transitions at Belle II — •Sascha Dreyer¹ and Torben Ferber² for the Belle II collaboration — ¹DESY, Hamburg, Germany — ²ETP, KIT, Karlsruhe, Germany

The Belle II experiment at the asymmetric e⁺ e⁻ SuperKEKB collider in Tsukuba, Japan provides an ideal test bench for searches for light dark sectors, due to a clean collision environment leading to low backgrounds.

A hypothetical new long-lived particle could serve as a portal to dark sectors. This particle could be produced in B-meson decays via b→ s quark transitions and decay to pairs of charged Standard Model particles. The displaced vertex signature can be reconstructed in case the particle decays within the tracking detectors.

This talk gives an overview of the search for such a new long-lived particle at Belle II. The sensitivity for different lifetime and mass scenarios will be shown together with work towards validating long-lived particle performance in data using control samples.