The annihilation of an Electron with a Positron, producing other particles; a common final state consists of two photons.
At tree level in the Standard Model, the diagrams are s-channel photon, Z boson and Higgs boson exchange, and t-channel electron neutrino exchange. The Higgs contribution couples to the Electron through its small Yukawa coupling. In a zero-electron-mass approximation that diagram vanishes, leaving the three gauge diagrams. The gauge contributions interfere; their sum has the high-energy behavior required by the electroweak gauge structure.
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Electron-positron annihilation is a fundamental process in particle physics that occurs when an electron (a negatively charged subatomic particle) encounters its antiparticle, the positron (which has the same mass as the electron but a positive charge). When they meet, they can annihilate each other, resulting in the conversion of their mass into energy, typically in the form of photons (gamma rays).