Journal ArticleDOI
Efficient calculation of one-loop QCD amplitudes
Zvi Bern,David A. Kosower +1 more
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TLDR
The outline of a new and efficient technique for the calculation of loop amplitudes in a gauge theory based on the technology of four-dimensional heterotic strings is presented, which finds complete agreement with the previous Feynman-diagram calculation of Ellis and Sexton.Abstract:
We present the outline of a new and efficient technique for the calculation of loop amplitudes in a gauge theory. The technique is based on the technology of four-dimensional heterotic strings. We display here the application to the calculation of the one-loop corrections to gluon-gluon scattering, in ordinary dimensional regularization. We find complete agreement with the previous Feynman-diagram calculation of Ellis and Sexton.read more
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Journal ArticleDOI
One-loop n-point gauge theory amplitudes, unitarity and collinear limits
TL;DR: In this article, the authors presented a technique which utilizes unitarity and collinear limits to construct ansatze for one-loop amplitudes in gauge theory, and proved that their N = 4 ansatz is correct.
Journal ArticleDOI
Fusing gauge theory tree amplitudes into loop amplitudes
TL;DR: In this paper, a large class of one-loop amplitudes for massless particles that can be constructed via unitarity from tree amplitudes, without any ambiguities, is identified.
Journal ArticleDOI
One-Loop n-Point Gauge Theory Amplitudes, Unitarity and Collinear Limits
TL;DR: In this paper, the authors presented a technique which utilizes unitarity and collinear limits to construct ansatze for one-loop amplitudes in gauge theory, and proved that their $N=4$ ansatz is correct using general properties of the relevant one-loops $n$-point integrals.
Journal ArticleDOI
The Computation of loop amplitudes in gauge theories
Zvi Bern,David A. Kosower +1 more
TL;DR: In this paper, a detailed derivation of a new and efficient technique based on the technology of four-dimensional heterotic strings, for computing one-loop amplitudes in gauge theories, along with expressions for the dimensionally regularized helicity amplitudes for the process with four external gluons.
Journal ArticleDOI
What is the simplest quantum field theory
TL;DR: In this article, the S-matrix structure of tree amplitudes has been studied in terms of a dual formulation of QFT, and it has been shown that the amplitudes of tree theories can be determined by recursion relations.