The muon was wrongly classified as one of these particles, whose existence was proposed by Hideki Yukawa, and they are bosons with integer spins.
One of these particles is electrically neutral and decays into an electron-positron pair and a photon in the Dalitz decay. Another type of these particles was discovered by Rochester and Butler after the analysis of certain 'V' events. The unusual decay of one of these particles was called the tau theta puzzle, and experiments to study them by Cronin and Fitch was the first evidence for CP violation. The muon was wrongly classified as one of these particles, whose existence was proposed by Hideki Yukawa, and they are bosons with integer spins. For 10 points, name these particles composed of a quark-anti-quark pair, exemplified by the j/psi particle and pions and kaons.
One of these particles is electrically neutral and decays into an electron-positron pair and a photon in the Dalitz decay.
{mesons} [prompt on {bosons}; accept {pions} until “{Rochester}”]