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An Optimal Observable for Color Singlet Identification
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We present a novel approach to construct a color tagger, i.e. an observable that is able to discriminate the decay of a color-singlet into two jets from a two-jet background in a different color configuration. We do this by explicitly taking the ratio of the corresponding leading-order matrix elements in the soft limit, thus obtaining an observable that is provably optimal within our approximation. We call this observable the "jet color ring" and we compare its performance to other color-sensitive observables such as jet pull and dipolarity. We also assess the performance of the jet color ring in simulations by applying it to the case of the hadronic decays of a boosted Higgs boson and of an electroweak boson.
Forward citations
Cited by 1 Pith paper
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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 b...
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