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New method for calculating helicity amplitudes of jet-like QED processes for high-energy colliders
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New method for calculating helicity amplitudes of jet-like QED processes for high-energy colliders
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Journal Article
New method for calculating helicity amplitudes of jet-like QED processes for high-energy colliders
2003
Overview
As continuation of our previous paper we further develop our new method for calculating helicity amplitudes of jet-like QED processes described by tree diagrams, applying it to lepton pair production. This method consists in replacing spinor structures for real and weakly virtual intermediate leptons by simple transition vertices. New vertices are introduced for the pair production case, and previous bremsstrahlung vertices are generalized to include virtual photons inside the considered jet. We present a diagrammatic approach that allows to write down in an efficient way the leading helicity amplitudes, at tree level. The obtained compact amplitudes are particularly suitable for numerical calculations in jet-like kinematics. Several examples with up to four particles in a jet are discussed in detail.
Publisher
Springer Verlag (Germany)
Subject
