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Elementary particles are classified according to their spin. Fermions have half-integer spin while bosons have integer spin. All the particles of the Standard Model have been experimentally observed, including the Higgs boson in 2012. [2] [3] Many other hypothetical elementary particles, such as the graviton, have been proposed, but not ...
In particle physics, an elementary particle or fundamental particle is a subatomic particle that is not composed of other particles. [1] The Standard Model presently recognizes seventeen distinct particles—twelve fermions and five bosons .
Hypothetical elementary particles (44 P) L. Leptons (2 C, 16 P) Q. Quarks (1 C, 22 P) Pages in category "Elementary particles"
Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation.The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the study of combination of protons and neutrons is called nuclear physics.
Elementary particles: Elementary fermions Half-integer spinObey the Fermi–Dirac statistics: Elementary bosons Integer spinObey the Bose–Einstein statistics: Quarks and antiquarks Spin = 1 / 2 Have color chargeParticipate in strong interactions and electroweak interactions: Leptons and antileptons Spin = 1 / 2 No color ...
[19] (Higher generations particles quickly decay into first-generation particles, and thus are not commonly encountered. [21]) This definition of ordinary matter is more subtle than it first appears. All the particles that make up ordinary matter (leptons and quarks) are elementary fermions, while all the force carriers are elementary bosons. [22]
This is a timeline of subatomic particle discoveries, including all particles thus far discovered which appear to be elementary (that is, indivisible) given the best available evidence. It also includes the discovery of composite particles and antiparticles that were of particular historical importance. More specifically, the inclusion criteria ...
Composite particles (such as hadrons, nuclei, and atoms) can be bosons or fermions depending on their constituents. More precisely, because of the relation between spin and statistics, a particle containing an odd number of fermions is itself a fermion. It will have half-integer spin. Examples include the following:
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