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Prüfung der Quantenelektrodynamik durch Compton-Streuung und Paarvernichtung

Aug, 1960
21 pages
Published in:
  • Z.Phys. 160 (1960) 4, 385-405
  • Published: Aug, 1960
DOI:
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Abstract:
In view of the present experimental efforts, Compton scattering and pair annihilation in flight are analysed as purely electrodynamic processes to test quantum electrodynamics at small distances. After a short discussion of the introduction of the form factors we consider the possibility of a (partial) cancellation between electrodynamic and nucleon structure effects. There is also the possibility of a partial cancellation of the non local effects in Compton scattering and wide angle bremsstrahlung because of the opposite action of spacelike and timelike form factor arguments. We calculate the Compton and the two photon pair annihilation cross sections with form factors and illustrate the result with several numerical diagrams. Two photon pair annihilation turns out to be especially favourable for a first test of quantum electrodynamics because there is no cancellation of possible non local effects and the necessary very high energy can be circumvented by a colliding beam experiment. With a 10% experimental error the planned colliding beam experiment at Stanford with 500 MeV could test the electron propagation function down to 0.6⋅10−140.6 \cdot 10^{-14} cm. After that, Compton scattering can be used to investigate the electron propagation function also for time-like arguments.
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