Abstract
In practical calculations of quantum electrodynamic (QED) processes we will become acquainted with a technique of calculation which allows the simple treatment of complicated expressions; especially the calculation of traces of products of many γ matrices. It is based on a projection procedure, i.e. a method to project a spinor with a given sign of energy and fixed polarization out of a general wave function or a wave packet. The appropriate operators which achieve this are called projection operators.
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© 1990 Springer-Verlag Berlin Heidelberg
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Greiner, W. (1990). Projection Operators for Energy and Spin. In: Relativistic Quantum Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88082-7_7
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DOI: https://doi.org/10.1007/978-3-642-88082-7_7
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-99535-7
Online ISBN: 978-3-642-88082-7
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