Electron Positron Annihilation Feynman Diagram

Contents 1 natural units 2 2 single particle dirac. A feynman diagram represents a perturbative contribution to the amplitude of a quantum transition from some initial quantum state to some final quantum state.

Feynman Diagrams Annihilation

Interpretation of bhabhasformula r.

Electron positron annihilation feynman diagram. Feynman diagrams and electron positron annihilation. We also show how such calculations are done with the aid of computer. Both antiparticles e and μ are represented as particles moving backward in time.

As an example we give a detailed calculation of cross section for annihilation of electron and positron into a muon pair. Dirac equation free quantum ﬁelds and construction of feynman amplitude using feynman diagrams. Schroeder 29 october 2002.

I still dont understand why it has to be a virtual electronpositron. Schroeder department of physics weber state university. For example in the process of electron positron annihilation the initial state is one electron and one positron the final state.

Feynman diagram of the annihilation of an electron e by a positron e the annihilation of the particle antiparticle pair leads to the formation of a muon μ and an antimuon μ. That is the arrowheads are reversed. I understand why one cannot have the annihilation of positron and electron to give one photon but the reason youve given why i cannot simply draw an x shaped diagram no virtual particle is that qed deals only with 3 particle vertices.

Const 2 each diagram representsa complex number that dependson e and. This is the web site for a set of curricular materials that im working on.

Particle Physics Electron Positron Pair Annihilation