Signal-background interference for a singlet spin-0 digluon resonance at the LHC

Abstract

Dijet mass distributions can be used to search for spin-0 resonances that couple to two gluons. I show that there is a substantial impact on such searches from the interference between the resonant signal and the continuum QCD background amplitudes. The signal dijet mass distribution is qualitatively modified by this interference, compared to the naive expectation from considering only the pure resonant contribution, even if the total width of the resonance is minimal and very small compared to the experimental dijet mass resolution. The impact becomes more drastic as the total width of the resonance increases. These considerations are illustrated using examples relevant to the 750 GeV diphoton excess recently observed at the LHC.

14 pages. v5 fixes errors in equations (2.10)-(2.15)

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• Interpreting the 750 GeV digamma excess: a review
• Learning from the New Higgs-like Scalar before It Vanishes
• Exploring Peaks and Valleys in the Diphoton Spectrum
• Searching for periodic signals in kinematic distributions using continuous wavelet transforms
• Signal-background interference for digluon resonances at the Large Hadron Collider
• Mixed gluinos and sgluons from a new SU(3) gauge group
• Interference effects in new physics searches
• Enhancing di-jet resonance searches via a final-state radiation jet tagging algorithm