The Higgs boson or Higgs particle is an elementary particle initially theorised in 1964, and tentatively confirmed to exist on 14 March 2013.
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The discovery has been called "monumental" because it appears to confirm the existence of the Higgs field, which is pivotal to the Standard Model and other theories within particle physics. In this discipline, it explains why some fundamental particles have mass when the symmetries controlling their interactions should require them to be massless, andlinked to thiswhy the weak force has a much shorter range than the electromagnetic force. Its existence and knowledge of its exact properties are expected to impact scientific knowledge across a range of fields, and should eventually allow physicists to determine whether the Standard Model or a competing theory is more likely to be correct, guide other theories and discoveries in particle physics, andas with other fundamental discoveries of the pastpotentially over time lead to developments in "new" physics, and new technologies.
This unanswered question in fundamental physics is of such importance that it led to a search of over 40 years for the Higgs boson and finally the construction of one of the most expensive and complex experimental facilities to date, the Large Hadron Collider, able to create and study Higgs bosons and related questions. On 4 July 2012, a previously unknown particle with a mass between 125 and 127 GeV/c2 was announced as being detected, which physicists suspected at the time to be the Higgs boson. By March 2013, the particle had been proven to behave, interact and decay in many of the expected ways predicted by the Standard Model, and was also tentatively confirmed to have + parity and zero spin, two fundamental criteria of a Higgs boson, making it also the first known scalar particle to be discovered in nature, although a number of other properties were not fully proven and some partial results do not yet preci.