Sumitted to PubDB: 2022-04-03

Category: Technical Paper, Visibility: Public

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Authors	Fernando Abudinen, Takeo Higuchi, Colm Murphy
Date	2021-09-14
Belle II Number	BELLE2-PUB-TE-2021-002
Abstract	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 Y(4S) resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be ${\epsilon }_{\mathrm{e}\mathrm{f}\mathrm{f}}=(30.0\pm 1.2(stat)\pm 0.4(syst))\mathrm{\%}$ for a category-based algorithm and ${\epsilon }_{\mathrm{e}\mathrm{f}\mathrm{f}}=(28.8\pm 1.2(stat)\pm 0.4(syst))\mathrm{\%}$ for a deep-learning-based algorithm.

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