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A powerful US atom-smasher that was the world's biggest particle collider for nearly a quarter-century closed forever on Friday, solidifying Europe's place as the world leader in physics.

The world's biggest particle collider set a new record early Monday, a feat that should accelerate the quest to pinpoint the elusive particle known as the Higgs Boson, a senior physicist said.

(AP) -- The world's biggest particle physics lab on Tuesday played down claims of a major discovery, after a leaked memo hinting that the elusive Higgs boson - or 'God particle' - may have been found ricocheted around science websites.