IEVref: 113-05-03 ID: Language: en Status: Standard Term: antiparticle Synonym1: Synonym2: Synonym3: Symbol: Definition: for a given kind of particle, that particle for which each characteristic that can assume two values has the complementary value, while the remaining characteristics are the sameNOTE 1 The concept of antiparticle applies to both elementary particles, e.g. positron as antiparticle of electron, and compound particles, such as proton, neutron and atom. NOTE 2 A particle and its antiparticle have in particular the same rest mass, the same spin quantum number, and opposite electric charges. Particle and antiparticle may be identical, for example photons. NOTE 3 A particle and its antiparticle may interact, resulting in two photons. This process is usually called annihilation. NOTE 4 An antiparticle is generally denoted by the same symbol as the corresponding particle but overlined, and its name is generally the name of the particle with the prefix anti, e.g. antiproton $\overline{\text{p}}$ corresponding to proton p, antihydrogen atom corresponding to hydrogen atom. Publication date: 2011-04 Source: Replaces: Internal notes: 2017-06-02: Cleanup - Remove Attached Image 113-05-03en.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: