Breit-Wheeler process

== English == === Etymology === Described theoretically by Gregory Breit and John A. Wheeler in 1934. === Noun === Breit-Wheeler process (plural Breit-Wheeler processes) (physics) A proposed physical process in which a positron-electron pair is created from the collision of two photons; the simplest mechanism by which pure light can be potentially transformed into matter. Synonym: Breit-Wheeler pair production