Mu Mesons

Some articles on meson, mesons, mu meson:

Muon - History
... A particle with a mass in the meson range had been predicted before the discovery of any mesons, by theorist Hideki Yukawa Because of its mass, the mu meson was ... Yukawa's predicted particle, the pi meson, was finally identified in 1947 (again from cosmic ray interactions), and shown to differ from the earlier-discovered mu meson by having the correct ... now known with the intermediate mass, the more general term meson was adopted to refer to any such particle within the correct mass range between ...