The positron, which is an elementary particle, annihilates with an electron, with their mass-energy being released as gamma rays.
The hypothesis is that the gravitational interaction is likewise mediated by an as yet undiscovered elementary particle, dubbed as "the graviton".
A fermion can be an elementary particle, such as the electron; or it can be a composite particle, such as the proton.
This is accomplished by constructing and upgrading a large volume elementary particle detector.
Manifesting a measurable unit or "elementary particle", each of the other three is modeled as discrete, a quantum field.
The electron quasiparticle has the same charge and spin as a normal (elementary particle) electron, and like a normal electron, it is a fermion.
For the next 25 years he worked on elementary particle theory with a primary interest in quantum field theory and symmetry.
By performing statistical analysis of this data, knowledge about elementary particle physics is gained.
