Loop amplitudes in gauge theories: modern analytic approaches
classification
✦ hep-th
hep-ph
keywords
amplitudesanalyticlooptechniquestheoriesunitarityapproachesarticle
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This article reviews on-shell methods for analytic computation of loop amplitudes, emphasizing techniques based on unitarity cuts. Unitarity techniques are formulated generally but have been especially useful for calculating one-loop amplitudes in massless theories such as Yang-Mills theory, QCD, and QED.
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