Kaluza-Klein graviton phenomenology for warped compactifications, and the 750 GeV diphoton excess

Abstract

A generic prediction of scenarios with extra dimensions accessible in TeV-scale collisions is the existence of Kaluza-Klein excitations of the graviton. For a broad class of strongly-warped scenarios one expects to initially find an isolated resonance, whose phenomenology in the simplest cases is described by a simplified model with two parameters, its mass, and a constant $\Lambda$ with units of mass parameterizing its coupling to the Standard Model stress tensor. These parameters are in turn determined by the geometrical configuration of the warped compactification. We explore the possibility that the 750 GeV excess recently seen in 13 TeV data at ATLAS and CMS could be such a warped Kaluza-Klein graviton, and find a best-fit value $\Lambda \approx 60$ TeV. We find that while there is some tension between this interpretation and data from 8 TeV and from the dilepton channel at 13 TeV, it is not strongly excluded. However, in the simplest scenarios of this kind, such a signal should soon become apparent in both diphoton and dilepton channels.

8 pages, 4 figures

References in corpus (15)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Parton distributions for the LHC
• Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• What is the gamma gamma resonance at 750 GeV?
• Search for physics beyond the standard model in dilepton mass spectra in proton-proton collisions at sqrt(s) = 8 TeV
• A pseudoscalar decaying to photon pairs in the early LHC Run 2 data
• The diphoton resonance as a gravity mediator of dark matter
• Astrophysical implications of hypothetical stable TeV-scale black holes
• Combination of searches for $WW$, $WZ$, and $ZZ$ resonances in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Next-to-leading order QCD corrections to a heavy resonance production and decay into top quark pair at the LHC
• Diphoton excess in phenomenological spin-2 resonance scenarios
• Soft Gluon Resummation Effects in Single Graviton Production at the CERN Large Hadron Collider in the Randall-Sundrum Model
• Search for a light Higgs resonance in radiative decays of the Y(1S) with a charm tag

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