Meson

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Meson

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In the classification of a subatomic particles by mass, the second lightest of such particles. Its mass is intermediate between that of the lepton and the nucleon (see hyperon). </dd>
Mesons are highly unstable, very short-lived particles; they carry positive, negative, or no charge, and, in a vacuum, move with velocities approaching the speed of light. All of these particles have extremely short lifetimes and the heavier more unstable mesons tend to decay into lighter ones. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use