$B$-flavor tagging at Belle II

Kavli Affiliate: T. Higuchi

| First 5 Authors: F. Abudinén, N. Akopov, A. Aloisio, V. Babu, Sw. Banerjee

| Summary:

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 $Upsilon$(4$S$) resonance with the Belle II detector at the SuperKEKB
collider. We measure the total effective tagging efficiency to be
$varepsilon_{rm eff} = big(30.0 pm 1.2(text{stat}) pm
0.4(text{syst})big)%$ for a category-based algorithm and $varepsilon_{rm
eff} = big(28.8 pm 1.2(text{stat}) pm 0.4(text{syst})big)%$ for a
deep-learning-based algorithm.

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