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T: Fachverband Teilchenphysik
T 18: Flavor physics: algorithms
T 18.4: Vortrag
Montag, 30. März 2020, 17:15–17:30, L-3.001
Calibration of Belle II hadronic tagging on Belle data — Florian Bernlocher4, Thomas Kuhr3, •Kilian Lieret1,2, Felix Metzner1,2, Markus Prim3, and Maximilian Welsch4 — 1Ludwig Maximilian Universität — 2Excellence Cluster Origins — 3Karlsruhe Institute of Technology — 4Rheinische Friedrich-Wilhelms-Universität Bonn
The Belle II experiment at the SuperKEKB accelerator produces pairs of B mesons. As the center of mass energy is known, the kinematics of one B meson (the signal B) are determined if the other B meson (the tag B) is fully reconstructed.
The tag B meson can be reconstructed in different channels and using different techniques. This analysis considers hadronic B decays reconstructed with the FEI (Full Event Interpretation), an algorithm relying heavily on machine learning techniques.
Because imperfections in the MC simulation may result in a different tag B reconstruction efficiency than in real data, the FEI must be calibrated. By considering a well known decay mode on signal side (here inclusive B —→ X ℓ νℓ), calibration weights can be calculated.
The calibration is performed for the full Belle dataset of 710 fb−1, which has been converted in order to be analyzed with the Belle II software framework. The results of the calibration will be first used for an update of Belle results for B —→ D(*) ℓ νℓ decays that profit from the improved Belle II reconstruction software.