Diphotons from an Electroweak Triplet-Singlet

Abstract

The neutral component of a real pseudoscalar electroweak (EW) triplet can produce a diphoton excess at 750 GeV, if it is somewhat mixed with an EW singlet pseudoscalar. This triplet-singlet mixing allows for greater freedom in the diboson branching ratios than the singlet-only case, but it is still possible to probe the parameter space extensively with 300 fb${}^{-1}$. The charged component of the triplet is pair-produced at the LHC, which results in a striking signal in the form of a pair of $W\gamma$ resonances with an irreducible rate of 0.27 fb. Other signatures include multiboson final states from cascade decays of the triplet-singlet neutral states. A large class of composite models feature both EW singlet and triplet pseudo-Nambu Goldstone bosons in their spectrum, with the diboson couplings generated by axial anomalies.

36 pages, 7 figures

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• (Non)decoupling of the Higgs triplet effects
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• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• LHC Future Prospects of the 750 GeV Resonance
• Learning from the New Higgs-like Scalar before It Vanishes
• 750 GeV Diphotons from Supersymmetry with Dirac Gauginos
• Boosted scalar confronting 750 GeV di-photon excess
• Search for W$\gamma$ resonances in proton-proton collisions at $\sqrt{s}=$ 13 TeV using hadronic decays of Lorentz-boosted W bosons
• Stopping Dark Mesons in Their Tracks with Long-Lived Particle and Resonant Signatures