The Higgs boson

Elementary particles get their mass from a fundamental field linked to the Higgs boson.

Topic of the moment: the Higgs boson

What is it?

The Higgs particle is a quantum of the Higgs field in the way a photon of light is a quantum of an electromagnetic field.

In 2012, the Conseil Européen pour la Recherche Nucléaire (CERN) announced a new particle consistent with the Higgs boson.

CERN is home to the Large Hadron Collider. The world’s largest accelerator boosts the energy of particles.

Watch CERN webcasts to learn the latest on the Higgs boson .

Higgs boson and the history of the universe

  • Particles interacted with the Higgs field just 10-12 seconds after the Big Bang.
  • Before this phase transition, all particles were massless. They travelled at the speed of light.
  • After the universe expanded and cooled, particles interacted with the Higgs field. This interaction gave them mass.

Nobel Prize

In 2013, the Nobel Prize in Physics was awarded jointly to François Englert and Peter Higgs.

The Royal Swedish Academy of Sciences awarded the prize:

“For the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles, and which recently was confirmed through the discovery of the predicted fundamental particle, by the ATLAS and CMS experiments at CERN's Large Hadron Collider”.

Standard Model of particle physics

In the Standard Model of particle physics, the electromagnetic force is carried by photons. These are familiar to us as particles of light. The weak nuclear force is carried by particles called W+, W- and Z bosons.

Three physicists found that the electromagnetic and weak forces are different manifestations of a single phenomenon. The scientists are:

  1. Abdus Salam
  2. Sheldon Glashow
  3. Steven Weinberg

At an energy of around 100 GeV, the forces unify into what is known as the electroweak force. It was not understood, however, why the photon is massless and the W and Z particles are massive. The Higgs mechanism was proposed by Peter Higgs and others to explain this.

In the Standard Model, quantum numbers like electric charge are dependent on 'coupling' to the appropriate field. In this case it is the electromagnetic field.

The Higgs mechanism introduced the idea of the Higgs field. Particles that couple to this field gain a mass, while those that don’t couple to it remain massless.

There are also some versions of the Higgs mechanism in which there is a field but no particle.

Learn more about Higgs Boson.

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