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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 .
This also means it is the first elementary scalar particle discovered in nature. Elementary bosons responsible for the four fundamental forces of nature are called force particles ( gauge bosons ). The strong interaction is mediated by the gluon , the weak interaction is mediated by the W and Z bosons, electromagnetism by the photon, and ...
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As with other elementary particles, photons are best explained by quantum mechanics and exhibit wave–particle duality, their behavior featuring properties of both waves and particles. [2] The modern photon concept originated during the first two decades of the 20th century with the work of Albert Einstein, who built upon the research of Max ...
Throughout the 1950s and 1960s, improvements in particle accelerators and particle detectors led to a bewildering variety of particles found in high-energy experiments. The term elementary particle came to refer to dozens of particles, most of them unstable. It prompted Wolfgang Pauli's remark: "Had I foreseen this, I would have gone into botany".
This second-generation particle is the third-most-massive quark, with a mass of 1.27 ± 0.02 GeV/c 2 as measured in 2022, and a charge of + 2 / 3 e. The existence of the charm quark was first predicted by James Bjorken and Sheldon Glashow in 1964, [ 1 ] [ 2 ] [ 3 ] and in 1970, Glashow, John Iliopoulos , and Luciano Maiani showed how ...
This second-generation particle is the third-most-massive quark, with a mass of 1.27 ± 0.02 GeV/c 2 as measured in 2022, and a charge of + 2 / 3 e. The existence of the charm quark was first predicted by James Bjorken and Sheldon Glashow in 1964, and in 1970, Glashow, John Iliopoulos , and Luciano Maiani showed how its existence would ...