The Higgs: so simple yet so unnatural
Dipartimento di Matematica e Fisica, Università di Roma Tre INFN, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146 Rome, Italy and CERN, Department of Physics, Theory Division CH-1211 Geneva 23, Switzerland
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Published online: 29 April 2014
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.
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