= Bottom-quark jet tagging
<Bottom-quark jet tagging> identifies <jets> compatible with containing a <hadron> carrying a <bottom quark>. A sufficiently long-lived bottom <hadron> travels away from the primary interaction before its <particle decay>, so displaced <particle tracks> and a secondary <decay vertex> provide evidence about its identity. A <lepton> within the <jet> can supply additional evidence. A <top quark> instead decays before <hadronization>.
A tag is a statistical classification, so both the efficiency for bottom <jets> and mistaken tags from <charm quarks> or light <jets> require <calibration>. That <calibration> concerns the <flavor tagging> response; it is not interchangeable with a <calorimeter calibration> of deposited <energy>. Control samples in collision data can measure the tagging efficiency for specified <momentum> and topology selections; those selections determine where the result applies.https://cds.cern.ch/record/2816310[ATLAS, The boosted X to b bbar tagger calibration using Z to b bbar events collected with the ATLAS detector, ATL-PHYS-SLIDE-2022-305: in situ efficiency measurement in a specified boosted topology]{ref}
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