What is a meson?
How big is a meson?
Mesons are about 2/3 the size of protons or neutrons. A meson is a kind of boson. Mesons are too small for us to see directly. Physicists only know they are there because of how they affect bigger things that we can see.
How long do mesons hang around?
All mesons are unstable: they form and break up again in less than a few hundredths of a microsecond. (And a microsecond is only one millionth of a second!) Mesons with an electrical charge decay into electrons and neutrinos; mesons without any electrical charge can decay into photons.
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