A K-meson is a meson that contains one ordinary quark (either an up quark or a down quark) and one strange quark. K-mesons were first discovered in 1947. The shortened name "kaon" came into use in about 1958. Kaons come in two varieties: positively charged and neutral. They are spin 0, weigh about half as much as nucleons, and decay by means of the weak interactions.
Related entry CP violation
Related category PARTICLE PHYSICS
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