Editing Electron–positron annihilation (section)

==High-energy case==
If either the electron or positron, or both, have appreciable [[kinetic energy|kinetic energies]], other heavier particles can also be produced (such as [[D meson]]s or [[B meson]]s), since there is enough kinetic energy in the relative velocities to provide the [[rest energy|rest energies]] of those particles. Alternatively, it is possible to produce photons and other light particles, but they will emerge with higher kinetic energies.

At energies near and beyond the mass of the carriers of the [[weak interaction|weak force]], the [[W and Z bosons]], the strength of the weak force becomes comparable to the [[electromagnetism|electromagnetic]] force.<ref name="griffiths"/> As a result, it becomes much easier to produce particles such as neutrinos that interact only weakly with other matter.

The heaviest particle pairs yet produced by electron–positron annihilation in [[particle accelerator]]s are [[W boson|{{SubatomicParticle|W boson+}}–{{SubatomicParticle|W boson-}}]] pairs (mass 80.385 GeV/c<sup>2</sup> × 2). The heaviest single-charged particle is the [[Z boson]] (mass 91.188 GeV/c<sup>2</sup>). The driving motivation for constructing the [[International Linear Collider]] is to produce the [[Higgs boson]]s (mass 125.09 GeV/c<sup>2</sup>) in this way.{{Citation needed|date=June 2020}}

[[File:Electron Positron Annihilation.png|thumb|Electron/positron annihilation at various energies]]