Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 40: Experimental methods II

T 40.10: Talk

Tuesday, March 16, 2021, 18:15–18:30, To

Hadronic Tagging at the Belle II experiment — Florian Bernlochner, Lu Cao, Jochen Dingfelder, Maximilian Graf, •Gianna Mönig, William Sutcliffe, and Ilias Tsaklidis for the Belle II collaboration — Physikalisches Institut der Rheinischen Friedrich-Wilhelms-Universität Bonn

The Belle II experiment, located at the SuperKEKB accelerator complex in Japan, recently started its first physics runs. Belle II aims to record B meson-pairs at unprecedented luminosities produced through electron-positron annihilation at the Υ(4S) resonance.

One key experimental method to carry out measurements with missing final state particles, such as neutrinos, is the reconstruction of one of the two B mesons in fully hadronic decay modes. The clean laboratory of electron-positron annihilation in combination with this approach allows one to infer flavor and momentum of the other B meson in the event. This method is called "hadronic tagging" and Belle II employs a machine learning based algorithm called the Full Event Interpretation (FEI) for an efficient reconstruction.

In this presentation, I review the current status and efficiency of hadronic tagging with early Belle II data. In addition, I present promising extensions that rely on the semi-inclusive reconstruction of the tag-side B meson or graph networks that are under study and summarize the calibration strategy of the tagging efficiency that was developed.