Meson
The most common natural way that we find mesons are through the interactions of cosmic rays with matter. This process can be duplicated in particle accelerators, which smash high-energy quarks and antiquarks. However, the mesons are very unstable and quickly turn into other particles. Charged Mesons can decay into electrons and neutrinos, and uncharged mesons can decay into photons. Since antimatter is destroying matter, a large amount of energy is given off. The energy follows the equation E=mc2.