British physicist Peter Higgs is one of the physicists who theorized in 1964 that the boson could be what gave mass to matter as the Universe cooled after the Big Bang.
Located in a 26.6-kilometer (16.5-mile) circular tunnel, the LHC was the scene of an extraordinary discovery announced in July 2012.
CERN's scientists said they were 99.9 percent certain they had found the Higgs Boson, an invisible particle without which, theorists say, humans and all the other joined-up atoms in the Universe would not exist.
At a cost of up to 50 million Swiss francs (40 million euros/$54 million), the upgrade will boost the level of energy at which the LHC smashes protons together.
This is necessary to confirm definitively that its particle is the elusive Higgs, and allow the LHC to probe new dimensions such as supersymmetry and dark matter.
The LHC is due to be back online by 2015, but CERN will not be idle during the shutdown.
Its scientists have to sift through a vast mountain of data, equivalent to 700 years of full HD-quality movies.