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Quantum Electrodynamic Interaction

Describes the force between charged particles as mediated by the exchange of photons, governed by the electromagnetic field tensor and Dirac equation.
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The statement of the theorem

The interaction between charged fermions (ψ\psi) and photons (AμA_{\mu}) is governed by the interaction Lagrangian density Lint\mathcal{L}_{int}: Lint=−eψˉγμAμψ\mathcal{L}_{int} = -e \bar{\psi} \gamma^{\mu} \textbf{A}_{\mu} \psi The resulting scattering amplitude M\mathcal{M} for a process like electron-electron scattering is derived from the Dyson series expansion of the S-matrix, incorporating the exchange of the photon field AμA_{\mu}.
Source: Wikipedia