Most of these particles are pseudoscalars and have 0 spin and negative parity. The decay of one of t
Most of these particles are pseudoscalars and have 0 spin and negative parity. The decay of one of these resulted in the Tau particles and the Theta particles, which had identical masses but opposite parities, thus leading to CP violation. The most famous one of these was independently discovered by Richter and Ting, and is called the "charmonium" or the "J-psi" particle. For 10 points, identify these particles which are made of a quark-antiquark pair, and whose name comes from Greek for "middle."
Most of these particles are pseudoscalars and have 0 spin and negative parity.
meson