Comments on the diphoton excess: critical reappraisal of effective field theory interpretations

Abstract

We consider the diphoton excess observed by ATLAS and CMS using the most up-to-date data and estimate the preferred enhancement in the production rate between 8 TeV and 13 TeV. Within the framework of effective field theory (EFT), we then show that for both spin-0 and spin-2 Standard Model (SM) gauge-singlet resonances, two of the three processes S to ZZ, S to Z gamma, and S to WW must occur with a non-zero rate. Moreover, we demonstrate that these branching ratios are highly correlated in the EFT. Couplings of S to additional SM states may be constrained and differentiated by comparing the S production rates with and without the vector-boson fusion (VBF) cuts. We find that for a given VBF to inclusive production ratio there is maximum rate of S to gauge bosons, b b-bar, and lighter quark anti-quark pairs. Simultaneous measurements of the width and the VBF ratio may be able to point towards the existence of hidden decays.

31 pages, 8 figures; version as published

References in corpus (16)

• 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
• Big-Bang Nucleosynthesis
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Scenarii for interpretations of the LHC diphoton excess: two Higgs doublets and vector-like quarks and leptons
• Rays of light from the LHC
• A pseudoscalar decaying to photon pairs in the early LHC Run 2 data
• The 750 GeV diphoton excess from the goldstino superpartner
• Effective interpretations of a diphoton excess
• Measuring the diphoton coupling of a 750 GeV resonance
• Gluon vs. Photon Production of a 750 GeV Diphoton Resonance
• The photon PDF in events with rapidity gaps
• The production of a diphoton resonance via photon-photon fusion
• Search for heavy resonances decaying to a $Z$ boson and a photon in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• The Virtual Diphoton Excess
• Higgs sectors with exotic scalar fields

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• 750 GeV Diphotons from Supersymmetry with Dirac Gauginos
• Novel kinematics from a custodially protected diphoton resonance
• Cornering diphoton resonance models at the LHC
• Bounds on supersymmetric effective operators from heavy diphoton searches
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