The S-Matrix is the most important quantity in elementary particle physics. The fundamental role played by the S-matrix was emphasized by Heisenberg in 1943. He was motivated by the following philosophy:
Use only such quantities in quantum physics which are closely related to physical experiments.
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© 2009 Springer-Verlag Berlin Heidelberg
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(2009). Quantum Particles on the Real Line – Ariadne’s Thread in Scattering Theory. In: Quantum Field Theory II: Quantum Electrodynamics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85377-0_9
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DOI: https://doi.org/10.1007/978-3-540-85377-0_9
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