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Belle II CKM Measurements: Vcb, Vub, And CP Phases.pdf

BELLE2-TALK-CONF-2021-054.pdf
Preview of Belle II CKM Measurements: Vcb, Vub, and CP Phases
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Summary

- Event: FPCP 2021, CKM measurements at Belle II experiment, presented by Qi-Dong ZHOU on behalf of Belle II Collaboration.
- Topic: CKM matrix and unitarity triangle (UT) determination using Belle II.
- Purpose: Precise measurement of the UT to search for new physics (NP) and test the Standard Model.
- Belle II Detector: Includes a vertex detector (VXD), central drift chamber (CDC), particle identification systems, electromagnetic calorimeter (ECL), and a KLM detector. It uses a GRID computing system.
- Focus of the Talk: Measurements of |Vcb|, |Vub|, and the CP-violating phases φ1, φ2, and φ3.
- Data Used: 34.6 fb⁻¹ for |Vcb|, |Vub|, and φ1; 62.8 fb⁻¹ for φ3. Data taken from October 19 to December 18, 2020, with an efficiency of 88.8%.
- B Decay Reconstruction: Belle II can reconstruct ~100 hadronic decay channels and ~10,000 decay chains, with efficiencies of 0.47% for B± and 0.29% for B0.
- Methods: Untagged and tagged side reconstruction, using Mbc and missing energy for B meson identification. Data analysis based on 34.6 fb⁻¹.

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Description

The Belle II experiment aims to precisely measure the CKM matrix and unitarity triangle (UT) through various processes, including tree and loop diagrams. This will enable a comprehensive test of the UT, allowing for the measurement of all sides and angles.

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