Science / CERN: What is Higgs boson?

December 13, 2011 - (CERES TV News Center) ---

In a seminar held at CERN this week, the ATLAS and CMS experiments presented the status of their searches for the Standard Model Higgs boson. Their results are based on the analysis of considerably more data than those presented at the summer conferences, sufficient to make significant progress in the search for the Higgs boson, but not enough to make any conclusive statement on the existence or non-existence of the elusive Higgs. The main conclusion is that the Standard Model Higgs boson, if it exists, is most likely to have a mass constrained to the range 116-130 GeV by the ATLAS experiment, and 115-127 GeV by CMS. Tantalising hints have been seen by both experiments in this mass region, but these are not yet strong enough to claim a discovery.

OK, BUT WHAT IS THIS?

The Higgs boson is a hypothetical massive elementary particle that is predicted to exist by the Standard Model (SM) of particle physics. The Higgs boson plays a crucial role in the Higgs mechanism responsible for breaking the electroweak symmetry of the Standard Model . If shown to exist, it would help explain why other elementary particles have mass.It is the only elementary particle predicted by the Standard Model that has not yet been observed in particle physics experiments.Theories that do not need the Higgs boson also exist and would be considered if the existence of the Higgs boson were ruled out. They are described as Higgsless models.

The Higgs mechanism explains why the W and Z bosons, which mediate weak interactions, are massive whereas the related photon, which mediates electromagnetism, is massless. The Higgs boson is expected to be in a class of particles known as scalar bosons. (Bosons are particles with integer spin, and scalar bosons have spin 0.)

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• CERN
• Higgs Boson
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