The dependency of boosted tagging algorithms on the event colour structure

Abstract

The impact of event colour structure on the performance of the Johns-Hopkins, CMS, HEPToptagger and N-Subjettiness algorithms is investigated by studying colour singlet and colour octet resonances decaying to top-quark pairs. Large differences in top-tagging efficiency are observed due to the different colour charge of each resonance. These differences are quantified as a function of the algorithm parameters, the jet size parameter and the probability to misidentify light quarks and gluons as top candidates. We suggest that future experimental searches would benefit from optimising the choice of algorithm parameters in order to minimise this source of model dependency.

17 pages, 7 figures

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• Tagging highly boosted top quarks
• Giving top quark effective operators a boost
• Study of Center of Mass Energy by Particles Collision in Some Black Holes
• Non-standard top substructure
• Fractal based observables to probe jet substructure of quarks and gluons
• Beyond $M_{t\bar{t}}$: learning to search for a broad $t\bar{t}$ resonance at the LHC
• Top-Tagging at the Energy Frontier
• Top quark physics in the Large Hadron Collider era