What is a Meson? - Definition of a Meson
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Mesons are tiny sub-atomic particles. Sub-atomic means they are smaller than atoms. They form out of quarks in high-energy situations. Mesons are about 2/3 the size of protons or neutrons. A meson is a kind of boson. All mesons are unstable: they form and break up again in less than a few hundredths of a microsecond. Mesons with an electrical charge decay into electrons and neutrinos; mesons without any electrical charge can decay into photons.

Bibliography and further reading about atoms:

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Professor Carr

Karen Eva Carr, PhD.
Assoc. Professor Emerita, History
Portland State University

Professor Carr holds a B.A. with high honors from Cornell University in classics and archaeology, and her M.A. and PhD. from the University of Michigan in Classical Art and Archaeology. She has excavated in Scotland, Cyprus, Greece, Israel, and Tunisia, and she has been teaching history to university students for a very long time.

Professor Carr's PSU page

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