Summary
We show that the low-energy theorem for the forward Compton amplitude of a stationary composite system in states with nonzero internal orbital angular momentum can only be verified with the use of the FW additive external electromagnetic interaction to order 1/M 3 together with the relativistic c.m. variables to order 1/M 2, contrary to what is usually believed. We also explicitly demonstrate the theorem even when both the constituent particles of the composite system are electrically charged.
Riassunto
Si mostra che il teorema di bassa energia per l’ampiezza di Compton in avanti di un sistema composto stazionario in stati con impulso angolare orbitale interno diverso da zero può essere verificato solo con l’uso dell’interazione elettromagnetica esterna additiva di FW fino all’ordine 1/M 3, insieme con le variabili relativistiche del c.m. fino all’ordine 1/M 2, contrariamente a ciò che si crede di solito. Inoltre si dimostra esplicitamente il teorema anche quando estrambe le particelle costituenti del sistema composto hanno carica elettrica.
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Sebastian, K.J. The low-energy theorem for the forward compton amplitude of a stationary composite system and the FW additive external electromagnetic interaction. Nuov Cim A 42, 259–266 (1977). https://doi.org/10.1007/BF02724586
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DOI: https://doi.org/10.1007/BF02724586