Minimal Composite Dynamics versus Axion Origin of the Diphoton excess

Abstract

ATLAS and CMS observe deviations from the expected background in the diphoton invariant mass searches of new resonances around 750 GeV. We show that a simple realization in terms of a new pseudoscalar state can accommodate the observations. The model leads to further footprints that can be soon observed. The new state can be interpreted both as an axion or as a {highly natural} composite state arising from minimal models of dynamical electroweak symmetry breaking. We further show how to disentangle the two scenarios. Beyond the possible explanation of the diphoton excess the results show that it is possible to directly test and constrain composite dynamics via processes stemming from its distinctive topological sector.

6 pages, Latex. Improved version with new figures and further details

References in corpus (14)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Minimal Walking Technicolor: Set Up for Collider Physics
• Ultra Minimal Technicolor and its Dark Matter TIMP
• The LHC diphoton resonance and dark matter
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• Diphoton Signatures from Heavy Axion Decays at the CERN Large Hadron Collider
• Technicolor Walks at the LHC
• The infrared dynamics of Minimal Walking Technicolor
• Infrared fixed point in SU(2) gauge theory with adjoint fermions
• The production of a diphoton resonance via photon-photon fusion
• Conformal Window of Gauge Theories with Four-Fermion Interactions and Ideal Walking
• The infrared regime of SU(2) with one adjoint Dirac flavour
• Early discovery of top partners and test of the Higgs nature

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• SU(2) Gauge Theory with Two Fundamental Flavours: a Minimal Template for Model Building
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• Diphoton excess at 750 GeV: gluon-gluon fusion or quark-antiquark annihilation?
• Uncovering new strong dynamics via topological interactions at the 100 TeV collider
• Learning from the New Higgs-like Scalar before It Vanishes
• Diphoton Resonances at the LHC
• Diphoton signal via Chern-Simons interaction in a warped geometry scenario
• Fundamental scalar field with zero dimension from anomaly cancelations