The neutral type of this particle can sometimes undergo the Dalitz decay into a photon and an electron-positron pair, although it usually decays into two photons.
The neutral type of this particle can sometimes undergo the Dalitz decay into a photon and an electron-positron pair, although it usually decays into two photons. The charged version of this particle was first discovered using photo-emulsions located at high altitudes, which on closer inspection showed their unusual "double tracks," one of which decayed into a muon, although today the muon is no longer grouped in the same family as this particle. Coming in three charges and consisting of two quarks, and mediating the interaction between a pair of nucleons via the Yukawa potential, this is, for 10 points, what variety of Meson, lighter than the Kaon?
The neutral type of this particle can sometimes undergo the Dalitz decay into a photon and an electron-positron pair, although it usually decays into two photons.
{Pion}