Loop amplitudes in gauge theories: modern analytic approaches

Ruth Britto
2011 Journal of Physics A: Mathematical and Theoretical  
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.
doi:10.1088/1751-8113/44/45/454006 fatcat:7v7ghyjb4rhr5nl77phbov7oma