Pseudoscalar meson

In high-energy physics, a pseudoscalar meson is a meson with total spin 0 and odd parity (usually noted as J=0). Compare to scalar meson.

Pseudoscalar mesons are commonly seen in proton-proton scattering and proton-antiproton annihilation. The pion was first proposed to exist by Yukawa in the 1930s as the primary force carrying boson of the Yukawa Potential in nuclear interactions, and was later observed at nearly the same mass that he originally predicted for it. In the 1950s and 1960s, the pseudoscalar mesons began to proliferate, and were eventually organized into a multiplet according to Murray Gell-Mann's so-called "Eightfold Way".