PhysicsDavid writes: "Announced this morning by Fermilab, the possible territory for the Higgs boson has shrunk even further. Combined results from the CDF and DZero experiments at the Tevatron have ruled out the existence of the Higgs with a mass between 160 GeV/c^2 and 170 GeV/c^2 with 95% confidence. At 90% confidence the Higgs is ruled out between about 157 GeV/c^2 and 185 GeV/c^2. Fermilab also has a press release. If the Higgs is to be found at the lighter end of the currently allowed 114 GeV/c^2 to 185 GeV/c^2 range, its detection is harder than at the heavier end due to the kinds of signals that the Large Hadron Collider and the Tevatron will see. Some physicists think that a lighter Higgs will be easier to spot at the Tevatron as the background processes which obscure the faint signal are not as prevalent in those experiments."
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