Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 32: Flavour physics VI

T 32.8: Talk

Tuesday, March 16, 2021, 17:45–18:00, Tg

Search for a long-lived particle in b to s transitions at Belle II — •Sascha Dreyer — DESY Belle II

The Belle II experiment at the asymmetric e+ e- SuperKEKB collider in Tsukuba, Japan allows to perform studies in the B-physics sector as well searches for dark sectors.

A hypothetical new long-lived particle, e.g. a scalar particle that mixes with the Standard Model Higgs boson, could serve as a portal to dark sectors. This particle could be produced in B meson decays via b to s quark transitions and decay to pairs of charged Standard Model particles. In the scalar portal case, small mixing angles result in a long lifetime on detector scales. The displaced vertex signature can be reconstructed within the tracking detectors.

This talk gives an overview of the search for a new long-lived particle at Belle II, including the reconstruction and selection of signal candidates.