Glue to light signal of a new particle

Abstract

Any new particle charged under $SU(3{)}_C$ and carrying electric charge will leave an imprint in the di-photon invariant mass spectrum as it can mediate $gg\to \gamma \gamma$ process through loops. The combination of properties of loop functions, threshold resummation and gluon pdfs can result in a peak-like feature in the di-photon invariant mass around twice the mass of a given particle even if the particle is short-lived and thus it doesn't form a narrow bound state. Using recent ATLAS analysis, we set upper limits on the combined $SU(3{)}_C$ and electric charge of new particles and indicate future prospects. We also discuss the possibility that the excess of events in the di-photon invariant mass spectrum around 750 GeV originates from loops of a particle with mass around 375 GeV.

5 pages, 8 figures, resummation of gluon exchanges near the threshold and discussion added

References in corpus (4)

• What is the gamma gamma resonance at 750 GeV?
• The 750 GeV Diphoton Excess May Not Imply a 750 GeV Resonance
• Constraining new coloured matter from the ratio of 3- to 2-jets cross sections at the LHC
• Variations on a Higgs theme

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• Top-quark effects in diphoton production through gluon fusion at NLO in QCD
• Diphoton Excess and Running Couplings
• Models of LHC Diphoton Excesses Valid up to the Planck scale
• Heavy Fermion Bound States for Diphoton Excess at 750GeV $\sim$ Collider and Cosmological Constraints $\sim$
• Precise top-quark mass from the diphoton mass spectrum
• Topological Structure of the Vacuum, Cosmological Constant and Dark Energy
• Learning from the New Higgs-like Scalar before It Vanishes
• Diphoton decay for a 750 GeV scalar boson in a $SU(6)\otimes U(1{)}_X$ model
• The top threshold effect in the $\gamma \gamma$ production at the LHC
• Barr-Zee Diagrams at a High-Energy Muon Collider
• The 750 GeV threshold to a new particle world
• Model Independent Constraints on Charges of New Particles