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Higgs boson

physical science Maturity 11-13 Next article →

The Higgs boson is an elementary particle within the Standard Model of particle physics. This model is a mathematical framework used to explain the fundamental particles and forces of the universe. The Higgs boson is produced by the quantum excitation of the Higgs field. It is characterized as a massive scalar boson. This means it has zero spin and even parity. It carries no electric charge and no color charge. The particle is extremely unstable. It decays into other particles almost immediately after it is generated.

Elementary particle interactions
Elementary particle interactions

To understand the boson, one must understand the Higgs field. This field is a scalar field that exists everywhere in the universe, even in empty space. The field has two neutral components and two electrically charged components. These form what is called a complex doublet of the weak isospin SU(2) symmetry. The field has a unique property known as a "sombrero potential." This potential causes the field to take a non-zero value everywhere in the vacuum. This non-zero value is known as a vacuum expectation.

Mecanismo de Higgs PH
Mecanismo de Higgs PH

The interaction between particles and this field is called the Higgs mechanism. This mechanism is responsible for giving mass to many elementary particles. In the Standard Model, certain forces are described by gauge invariance. This means that certain changes to a system do not change the physical results. However, by the 1960s, physicists faced a major problem with the weak force. Symmetry requirements predicted that the W and Z gauge bosons should have zero mass. Yet, experiments showed these particles actually had non-zero rest mass.

Spontaneous symmetry breaking (explanatory diagram)
Spontaneous symmetry breaking (explanatory diagram)

Scientists solved this problem using the concept of spontaneous symmetry breaking. This occurs when a symmetric system becomes asymmetric under certain conditions. In the early 1960s, Philip Anderson suggested that symmetry breaking could explain how gauge bosons gain mass. He proposed that certain particles might be "absorbed" by the W and Z bosons. In 1964, three different groups of researchers independently developed this theory more fully. They showed that the Higgs field would break electroweak symmetry. This process allows particles to acquire mass without requiring the existence of Goldstone bosons.

Higgs, Peter (1929) cropped
Higgs, Peter (1929) cropped

The history of this discovery spans several decades of intense research. In 1964, Peter Higgs and five other scientists proposed the Higgs mechanism. While the particle bears Higgs's name, many researchers contributed to the theory between 1960 and 1972. For many years, the existence of the Higgs field was the central problem in particle physics. It was the last unverified part of the Standard Model. Because the field is so difficult to detect, it required advanced technology to find proof.

Nobel Prize 24 2013
Nobel Prize 24 2013

After a 40-year search, the Higgs boson was finally discovered in 2012. This discovery happened at the Large Hadron Collider, or LHC, at CERN near Geneva, Switzerland. Two specific experiments, ATLAS and CMS, detected the particle. The results confirmed that the particle matched the expected properties of a Higgs boson. This achievement was a massive milestone for science. Because of their theoretical work, Peter Higgs and François Englert were awarded the Nobel Prize in Physics in 2013.

HiggsDecays
HiggsDecays

The Higgs boson has significant importance for our understanding of matter. It explains why fundamental constituents like electrons and quarks have mass. Without this interaction, the particles that make up our world would behave very differently. In popular media, the particle is often called the "God particle." This name comes from a 1993 book by Leon M. Lederman. However, many physicists, including Peter Higgs himself, have criticized this label. The particle is best understood as a vital component of the Standard Model.

Higgs-Mass-MetaStability
Higgs-Mass-MetaStability
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🖼️ Images & Media (19)
File:Mecanismo de Higgs PH.png
Mecanismo de Higgs PH.png
File:Higgs-Mass-MetaStability.svg
Higgs-Mass-MetaStability.svg
File:AIP-Sakurai-best.JPG
AIP-Sakurai-best.JPG
File:Higgs, Peter (1929) cropped.jpg
Higgs, Peter (1929) cropped.jpg
File:Nobel Prize 24 2013.jpg
Nobel Prize 24 2013.jpg
File:2-photon Higgs decay.svg
2-photon Higgs decay.svg
File:4-lepton Higgs decay.svg
4-lepton Higgs decay.svg
File:HiggsCouplings.png
HiggsCouplings.png
File:Spontaneous symmetry breaking (explanatory diagram).png
Spontaneous symmetry breaking...
File:Elementary particle interactions.svg
Elementary particle interactions.svg
File:One-loop-diagram.svg
One-loop-diagram.svg
File:Higgs-gluon-fusion.svg
Higgs-gluon-fusion.svg

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