Cut-constructible part of QCD amplitudes
- Institute for Theoretical Physics, University of Amsterdam Valckenierstraat 65, 1018 XE Amsterdam (Netherlands)
- Blackett Laboratory, Imperial College, London, SW7 2AZ (United Kingdom)
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90090-1547 (United States)
Unitarity cuts are widely used in analytic computation of loop amplitudes in gauge theories such as QCD. We expand upon the technique introduced in hep-ph/0503132 to carry out any finite unitarity cut integral. This technique naturally separates the contributions of bubble, triangle and box integrals in one-loop amplitudes and is not constrained to any particular helicity configurations. Loop momentum integration is reduced to a sequence of algebraic operations. We discuss the extraction of the residues at higher-order poles. Additionally, we offer concise algebraic formulas for expressing coefficients of three-mass triangle integrals. As an application, we compute all remaining coefficients of bubble and triangle integrals for nonsupersymmetric six-gluon amplitudes.
- OSTI ID:
- 20774728
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 10; Other Information: DOI: 10.1103/PhysRevD.73.105004; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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