UPDATE 3-Scientists home in on missing link of physics
* Boson posited to give energy and mass to other particles
* Results are not yet conclusive proof that particle exists (Adds quotes from Peter Higgs and head of CERN)
By Robert Evans
GENEVA, Dec 13 (Reuters) - International scientists said on Tuesday they had found signs of the Higgs boson, an elementary sub-atomic particle believed to have played a vital role in the creation of the universe after the Big Bang.
Peter Higgs, the 82-year-old British theoretical physicist who first proposed the existence of the particle in 1964 as the missing link of a grand theory of matter and energy, was watching the announcement on a webcast with colleagues at Edinburgh University, where he is an emeritus professor.
Glenn A. Walsh, Project Director,
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