Dichroic subjettiness ratios to distinguish colour flows in boosted boson tagging

Abstract : $N$-subjettiness ratios are in wide use for tagging heavy boosted objects, in particular the ratio of 2-subjettiness to 1-subjettiness for tagging boosted electroweak bosons. In this article we introduce a new, \emph{dichroic} ratio, which uses different regions of a jet to determine the two subjettiness measures, emphasising the hard substructure for the 1-subjettiness and the full colour radiation pattern for the 2-subjettiness. Relative to existing $N$-subjettiness ratios, the dichroic extension, combined with SoftDrop (pre-)grooming, makes it possible to increase the ultimate signal significance by about $25\%$ (for $2\,\text{TeV}$ jets), or to reduce non-perturbative effects by a factor of $2{-}3$ at $50\%$ signal efficiency while maintaining comparable background rejection. We motivate the dichroic approach through the study of Lund diagrams, supplemented with resummed analytical calculations.
Type de document :
Pré-publication, Document de travail
t16/180. 42 pages, 17 figures. 2017
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Soumis le : vendredi 10 février 2017 - 14:40:03
Dernière modification le : jeudi 15 mars 2018 - 15:05:54
Document(s) archivé(s) le : jeudi 11 mai 2017 - 13:40:18


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  • HAL Id : cea-01464757, version 1
  • ARXIV : 1612.03917


Gavin P. Salam, Lais Schunk, Gregory Soyez. Dichroic subjettiness ratios to distinguish colour flows in boosted boson tagging. t16/180. 42 pages, 17 figures. 2017. 〈cea-01464757〉



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