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Following an investigation of several indications for new physics from LHCdata, a detailed exploration of the Georgi-Machacek (GM) model was elaboratedin a previous publication. This framework is used here to interpret thefindings of Crivellin et al., which were obtained by combining the 2 photonmass spectrum from ATLAS and CMS, adding extra conditions, the most efficientone being the presence of >90 GeV missing transverse energy. The claim is a ~5s.d. excess at 151 GeV. The GM model naturally explains this as coming from thecascade A(400)->H(151)Z, where H(151) is an isosinglet predicted by GM andwhere the accompanying signal comes from the decay of a Z boson into neutrinopairs. Satisfying the constraints from LHC measurements of the ZWW channel,which can receive a large contribution from this cascade, suggests that H(151)could dominantly decay into two light CP-odd scalars, following an ATLASindication for h(125) decaying into bbmumu. A spectacular occurrence of signalsis predicted at an $e^+e^-$ collider operating up to 1 TeV, an energysufficient to cover the whole scenario.

A Georgi-Machacek Interpretation of the Associate Production of a Neutral Scalar with Mass around 151 GeV