Distinguishing Di-jet Resonances at the LHC

Abstract

Anticipating that a di-jet resonance could be discovered at the 14 TeV LHC, we present two different strategies to reveal the nature of such a particle; in particular to discern whether it is a quark-antiquark (qqbar), quark-gluon (qg), or gluon-gluon (gg) resonance. The first method relies on the color discriminant variable, which can be calculated at the LHC from the measurements of the di-jet signal cross section, the resonance mass and the resonance width. Including estimated statistical uncertainties and experimental resolution, we show that a qg excited quark resonance can be efficiently distinguished from either a qqbar coloron or a gg color-octet scalar using the color discriminant variable at LHC-14. The second strategy is based on the study of the energy profiles of the two leading jets in the di-jet channel. Including statistical uncertainties in the signal and the QCD backgrounds, we show that one can distinguish, in a model-independent way, between gg, qg, and qqbar resonances; an evaluation of systematic uncertainties in the measurement of the jet energy profile will require a detailed detector study once sufficient 14 TeV di-jet data is in hand.

25 pages, 17 figures; references added. Minor clarifications and footnote(s) added, based on referee suggestions

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Cited by in corpus (8)

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• Phenomenology of unusual top partners in composite Higgs models
• Leptophobic boson signals with leptons, jets and missing energy
• Broadening the Reach of Simplified Limits on Resonances at the LHC
• Simplified Limits on Resonances at the LHC
• Resonance contribution of scalar color octet to $t\bar{t}$ production at the LHC in the minimal four color quark-lepton symmetry model
• Mixed gluinos and sgluons from a new SU(3) gauge group
• Performance and calibration of quark/gluon-jet taggers using 140 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector