the idea girl says
now 4 is sigma 2.1 for CMS on this standard model graph for the Higgs Boson
|Scan of the profile likelihood as a function of the signal strength relative to the expectation for the production and decay of a standard model Higgs boson, μ, for \mh=125\GeV. The statistical significance against the background-only (μ=0) hypothesis is shown for the two channels and their combination. By definition, the expectation for the standard model Higgs boson with a mass of 125\GeV is μ=1. The non-fermionic decay contributions expected for the standard model Higgs boson with a mass of 125\GeV are considered as part of the background and therefore not scaled with μ.
source diagram and quote