Summary
We discuss the question of how and when one has to include low-energy theorems within the framework ofS-matrix theory together with generalized unitarity. We show by means of explicit examples how the low-energy theorems emerge when a photon is involved and why they are not implied if we replace the photon by a massive vector meson.
Riassunto
Si discute il problema di come e quando si devono includere i teoremi di bassa energia nello schema della teoria della matriceS assieme all’unitarietà generalizzata. Si dimostra per mezzo di esempi espliciti come i teoremi di bassa energia emergano quando è coinvolto un fotone e perché essi non occorrono se si sostituisce il fotone con un mesone vettoriale con massa.
Резюме
Мы рассматриваем вопрос, как и когда необходимо включать теоремы низких энергий в рамках теорииS-матрицы, вместе с обобщенной унитарностью. Мы показываем на точных примерах, как возникают теоремы низких энергий, когда включается в рассмотрение фотон, и почему они не предполагаются, если мы заменяем фотон массивным векторным мезоном.
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References
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Horn, D., Jacob, M. Generalized unitarity and low-energy theorems. Nuovo Cimento A (1965-1970) 56, 83–91 (1968). https://doi.org/10.1007/BF02820277
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DOI: https://doi.org/10.1007/BF02820277