Pseudoscalar meson
Meson with total spin 0 and odd parity / From Wikipedia, the free encyclopedia
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In high-energy physics, a pseudoscalar meson is a meson with total spin 0 and odd parity (usually notated as JP = 0− ).[1][lower-alpha 1] Pseudoscalar mesons are commonly seen in proton-proton scattering and proton-antiproton annihilation, and include the pion (π), kaon (K), eta (η), and eta prime (η′) particles, whose masses are known with great precision.
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Among all of the mesons known to exist, in some sense, the pseudoscalars are the most well studied and understood.