Hunt for Higgs boson: Mass of top quark narrows search

New high-energy particle research by a team working with data from Fermi National Accelerator Laboratory heightens uncertainty about the exact nature of a key theoretical component of modern physics -- the massive fundamental particle, the Higgs boson. Particle collision data resulting in two leptons helped improve measurements of the mass of the heavy subatomic top quark, which bears on the Higgs, says a physicist who led the team.

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