Published January 1, 2022
| Version v1
Journal article
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B-flavor tagging at Belle II
Creators
- 1. Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
- 2. Alikhanyan Natl Sci Lab, Yerevan 0036, Armenia
- 3. DESY, D-22607 Hamburg, Germany
- 4. Univ Louisville, Louisville, KY 40292 USA
- 5. Karlsruher Inst Technol, Inst Expt Teilchenphys, D-76131 Karlsruhe, Germany
- 6. Univ Mississippi, University, MS 38677 USA
- 7. Univ Bonn, D-53115 Bonn, Germany
- 8. Univ Hawaii, Honolulu, HI 96822 USA
- 9. Charles Univ Prague, Fac Math & Phys, Prague 12116, Czech Republic
- 10. Ludwig Maximilians Univ Munchen, D-80539 Munich, Germany
- 11. Indian Inst Technol Guwahati, Gauhati 781039, Assam, India
- 12. Ist Nazl Fis Nucl, Sez Roma Tre, I-00146 Rome, Italy
Description
We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom (B) mesons at Belle II. The algorithms provide essential inputs for measurements of quark-flavor mixing and charge-parity violation. We validate and evaluate the performance of the algorithms using hadronic B decays with flavor-specific final states reconstructed in a data set corresponding to an integrated luminosity of 62.8 fb(-1), collected at the gamma(4S) resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be epsilon(eff) = (30.0 +/- 1.2(stat) +/- 0.4(syst))% for a category-based algorithm and epsilon(eff) = (28.8 +/- 1.2(stat) +/- 0.4(syst))% for a deep-learning-based algorithm.
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