The Probable Fate of the Standard Model - High Energy Physics - PhenomenologyReportar como inadecuado

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Abstract: Extrapolating the Standard Model to high scales using the renormalisationgroup, three possibilities arise, depending on the mass of the Higgs boson: ifthe Higgs mass is large enough the Higgs self-coupling may blow up, entailingsome new non-perturbative dynamics; if the Higgs mass is small the effectivepotential of the Standard Model may reveal an instability; or the StandardModel may survive all the way to the Planck scale for an intermediate range ofHiggs masses. This latter case does not necessarily require stability at alltimes, but includes the possibility of a metastable vacuum which has not yetdecayed. We evaluate the relative likelihoods of these possibilities, on thebasis of a global fit to the Standard Model made using the Gfitter package.This uses the information about the Higgs mass available directly from Higgssearches at LEP and now the Tevatron, and indirectly from precision electroweakdata. We find that the `blow-up- scenario is disfavoured at the 99% confidencelevel 96% without the Tevatron exclusion, whereas the `survival- and possible`metastable- scenarios remain plausible. A future measurement of the mass ofthe Higgs boson could reveal the fate of the Standard Model.

Autor: J. Ellis, J.R. Espinosa, G.F. Giudice, A. Hoecker, A. Riotto


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