The discovery of the Higgs boson, dubbed the God particle, was celebrated worldwide as an explanation for mass itself. Yet all is not well and there is talk at CERN of 'the nightmare scenario'. For there have been no new discoveries that might enable an elegant theory to make sense of the current chaos. Should we abandon supersymmetry, string theory, and other attempts to provide a theory of everything? Was the Higgs a key step towards a final theory, or is the theory behind it and particle physics itself in real trouble?

Cambridge physicist Ben Allanach, Maxwell prize-winning CERN theoretical physicist John Ellis and Edinburgh Astrophysicist Catherine Heymans look at what's missing from our picture of particle theory.

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