Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 40: Experimental methods II

T 40.9: Vortrag

Dienstag, 16. März 2021, 18:00–18:15, To

Performance and calibration of the semileptonic Full Event Interpretation at Belle II — Florian Bernlochner, Jochen Dingfelder, Peter Lewis, •Alina Manthei, and William Sutcliffe for the Belle II collaboration — Physikalisches Institut, Universität Bonn, Germany

The Belle II experiment is located at the SuperKEKB collider in Japan, where electrons and positrons collide at the Υ(4S) resonance to produce BB pairs. The analysis of the decays of these B mesons allows for precise tests of the Standard Model. In order to investigate properties of B meson decays with missing energy as precisely as possible, one relies on the accurate reconstruction of the second B meson in the event. For this purpose, a reconstruction algorithm has been developed, named the Full Event Interpretation (FEI). As not all of the features of the detector are modelled precisely by Monte Carlo simulation, differences in efficiencies of the FEI in data and MC may occur. Therefore, a careful calibration of the tagging efficiency is required to account for such mismatches in efficiencies. In this talk, the strategy for obtaining such a calibration in a data-driven way for semileptonically tagged events is presented and first results are shown.