The Higgs: so simple yet so unnatural

TL;DR

The paper reviews the implications of LHC results, especially the Higgs discovery and absence of new physics signals, challenging traditional notions of naturalness in particle physics.

Contribution

It provides a concise overview of particle physics post-LHC results, highlighting the tension between the Higgs discovery and the lack of new physics signals.

Findings

Higgs boson discovered at 126 GeV

No signals of new physics observed

Naturalness notion is challenged

Abstract

We present a concise outlook of particle physics after the first LHC results at 7-8 TeV. The discovery of the Higgs boson at 126 GeV will remain as one of the major physics discoveries of our time. But also the surprising absence of any signals of new physics, if confirmed in the continuation of the LHC experiments, is going to drastically change our vision of the field. At present the indication is that Nature does not too much care about our notion of naturalness. Still the argument for naturalness is a solid one and we are facing a puzzling situation. We review the established facts so far and present a tentative assessment of the open problems.