Working order-by-order in the strong coupling, the paper constructs the likelihood ratio for boosted H->gg jets versus QCD jets and validates a new color-flow observable, d2/z^2, that improves signal over background by roughly a factor of 150 in Pythia.
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Systematically Constructing the Likelihood for Boosted $H\to gg$ Decays
Working order-by-order in the strong coupling, the paper constructs the likelihood ratio for boosted H->gg jets versus QCD jets and validates a new color-flow observable, d2/z^2, that improves signal over background by roughly a factor of 150 in Pythia.