It is a Graviton! or maybe not

Abstract

The discovery of Kaluza-Klein (KK) gravitons is a smoking gun of extra dimensions. Other scenarios, however, could give rise to spin-two resonances of a new strongly-coupled sector and act as impostors. In this paper we prove that a spin-two resonance does not couple to the Standard Model through dimension-four operators. We then show that the massive graviton and its impostor both couple to the Standard Model through the same dimension-five operators. Therefore the spin determination is identical. Nevertheless, we also show that one can use the ratio of branching ratios to photons and to jets for distinguishing between KK gravitons and their impostors. The capacity to distinguish between KK gravitons and impostors is a manifestation of the breakdown of the duality between AdS and strongly-coupled theories.

14 pages, 3 figures, 1 table. References added, typos corrected

References in corpus (10)

• Building an AdS/CFT superconductor
• Quark and Gluon Tagging at the LHC
• Black Holes and Quantum Gravity at the LHC
• Flavor and CP Invariant Composite Higgs Models
• A negative S parameter from Holographic Technicolor
• Discovering Technicolor
• HELAS and MadGraph/MadEvent with spin-2 particles
• Massive Spin-2 States as the Origin of the Top Quark Forward-Backward Asymmetry
• Tensor Reggeons from Warped Space at the LHC
• Four boosted tops from a Regge gluon

Cited by in corpus (10)

• The diphoton resonance as a gravity mediator of dark matter
• Scale-invariant resonance tagging in multijet events and new physics in Higgs pair production
• Gravity-mediated (or Composite) Dark Matter
• Gravity-mediated (or Composite) Dark Matter Confronts Astrophysical Data
• Inferring the nature of the boson at 125-126 GeV
• Note on Spin-2 Particle Interpretation of the 750~GeV Diphoton Excess
• Constraints on models for the Higgs boson with exotic spin and parity in $\mathbf{VH}\to \mathbf{Vb}\bar{\mathbf{b}}$ final states
• Spin-2 Form Factors at Three Loop in QCD
• On the compatibility of the diboson excess with a gg-initiated composite sector
• Muon $g-2$ Anomaly from a Massive Spin-2 Particle