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| Journal Article | PUBDB-2022-06492 |
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2022
Springer
Heidelberg
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Please use a persistent id in citations: doi:10.1140/epjc/s10052-022-10180-9 doi:10.3204/PUBDB-2022-06492
Report No.: BELLE2-PUB-TE-2021-002; arXiv:2110.00790
Abstract: We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( [inline-graphic not available: see fulltext]) 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 [inline-graphic not available: see fulltext] decays with flavor-specific final states reconstructed in a data set corresponding to an integrated luminosity of 62.8 fb$^{-1}$, collected at the resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be $\begin{aligned} \varepsilon _\mathrm{eff} = \big (30.0 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$for a category-based algorithm and $\begin{aligned} \varepsilon _\mathrm{eff} = \big (28.8 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$for a deep-learning-based algorithm.
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; Upsilon(10570): electroproduction ; CP: violation ; asymmetry: CP ; anti-B0: semileptonic decay ; B0: decay modes ; BELLE ; KEK-B ; particle identification: efficiency ; B0 anti-B0: mixing ; CKM matrix ; particle identification: performance ; experimental results
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