# Is there any experimental proof for QED theory? [closed]

Are there any primary experiments used to try to prove the Quantum Electrodynamics theory? Were they all successful, and how were they performed? Also, I was wondering where Feynman's equations are used primarily now, everyday.

## closed as too broad by Emilio Pisanty, Qmechanic♦Jul 15 '18 at 13:10

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• You can test QED using high power lasers. ELI-NP will have an experimental program dedicated to test QED features. – Andrei Geanta Jul 15 '18 at 10:16
• You may want to split this into 2 questions. Additionally, a question like "Where are Feynman's equations used now?" is way too broad for physics SE. – user191954 Jul 15 '18 at 10:20
• The equations behind Feynman diagrams are mostly used in Particle Physics. They are experimentally tested in particle accelerators (like LHC). – Andrei Geanta Jul 15 '18 at 10:30
• As far as I know, ESR (Electron Spin Resonance) gives the best comparison of the theory with experiment. – Pieter Jul 15 '18 at 12:02
• Experiments with multiple generations of accelerators have all proven QED. The deviation of the electron and muon g-factor from its Dirac value of 2 is perhaps the most accurate confirmations. Also check out the Lamb shift. – my2cts Jul 15 '18 at 13:54

• @Pieter The point is that if you measure $\alpha$ in different ways, QED predicts you'll get the same result. (This is just like how Newtonian mechanics predicts that measuring $F/a$ and $F_g / (GM/r^2)$ will give the same result.) – knzhou Jul 15 '18 at 12:52