meson
Noun
Meaning
The mesial plane dividing the body of an animal into similar right and left halves. The line in which it meets the dorsal surface has been called the dorsimeson, and the corresponding ventral edge the ventrimeson.
Source: Webster's dictionarySynonyms
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As more types of mesons were discovered in accelerator experiments later, it was eventually found that the mu meson significantly differed not only from the pi meson (of about the same mass), but also from all other types of mesons.
December 18, 2013 Neutral pion decays The meson has a mass of main and a mean lifetime of main.
Because of its mass, the mu meson was initially thought to be Yukawa's particle, but it later proved to have the wrong properties.
Each type of meson has a corresponding antiparticle (antimeson) in which quarks are replaced by their corresponding antiquarks and vice versa.
Initially after its discovery in 1936, the muon (initially called the "mu meson") was thought to be this particle, since it has a mass of 106 MeV.
It represents whether or not the wavefunction of the meson remains the same under the interchange of their quark with their antiquark.