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GN2 — Jet Flavor Tagging
ATLAS's jet flavor tagger for Run 3, published in Nature Communications. A single transformer reads the tracks of a jet, and two auxiliary objectives make it learn the decay structure that flavor depends on.
Key result
3.5×
fewer c-jets mistaken for b-jets
Measured in LHC collision data. At the same 70% efficiency for real b-jets, GN2 mistakes 3.5 times fewer charm jets and 1.8 times fewer light-flavor jets for b-jets than DL1d, the tagger it replaced.
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