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, 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 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.
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ArXiv ePrint: 1612.03917
On leave from CNRS, UMR 7589, LPTHE, F-75005, Paris, France. (Gavin P. Salam)
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Salam, G.P., Schunk, L. & Soyez, G. Dichroic subjettiness ratios to distinguish colour flows in boosted boson tagging. J. High Energ. Phys. 2017, 22 (2017). https://doi.org/10.1007/JHEP03(2017)022
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DOI: https://doi.org/10.1007/JHEP03(2017)022