Preprint number: CP3-Origins-2015-56 DNRF90 and DIAS-2015-56
It is possible to delay the hierarchy problem, by replacing the standard Higgs-mechanism by the Coleman-Weinberg mechanism, and at the same time ensuring perturbative naturalness through the so-called Veltman conditions. As we showed in a previous study, this scenario requires the coupling to an extra singlet scalar, which also has to couple to a dark or heavy fermionic sector to satisfy the Veltman conditions for delayed naturalness and simultaneously be consistent with the experimental values of the standard model parameters. Intriguingly, the Higgs mass value becomes a prediction of this scenario. Furthermore, the mass of the extra singlet scalar is also predicted, and has so far been out of experimental reach.
In this paper, we show that this scenario can explain a 750 GeV resonance, producing a diphoton excess by the decay of the heavy scalar through its predicted couplings to fermions.
The severe theory constraints of this scenario leads to additional observable predictions; in particular, we will show that an extra QCD-colored fermions are expected in the TeV mass range.
Thus, it will in the near future be possible to test, whether a pertubative natural Coleman-Weinberg mechanism is the correct paradigm of the standard model Higgs-sector.