Feynman slash notation
Notation for contractions with gamma matrices / From Wikipedia, the free encyclopedia
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In the study of Dirac fields in quantum field theory, Richard Feynman invented the convenient Feynman slash notation (less commonly known as the Dirac slash notation[1]). If A is a covariant vector (i.e., a 1-form),
where γ are the gamma matrices. Using the Einstein summation notation, the expression is simply
- .