Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-21
Eur.Phys.J. C35 (2004) 105-118
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 2 figures; one appendix added, discussions clarified, version to appear in Eur. Phys. J. C
Scientific paper
10.1140/epjc/s2004-01723-7
We present a systematic method for reducing an arbitrary one-loop N-point massless Feynman integral with generic 4-dimensional momenta to a set comprised of eight fundamental scalar integrals: six box integrals in D=6, a triangle integral in D=4, and a general two-point integral in D space time dimensions. All the divergences present in the original integral are contained in the general two-point integral and associated coefficients. The problem of vanishing of the kinematic determinants has been solved in an elegant and transparent manner. Being derived with no restrictions regarding the external momenta, the method is completely general and applicable for arbitrary kinematics. In particular, it applies to the integrals in which the set of external momenta contains subsets comprised of two or more collinear momenta, which are unavoidable when calculating one-loop contributions to the hard-scattering amplitude for exclusive hadronic processes at large momentum transfer in PQCD. The iterative structure makes it easy to implement the formalism in an algebraic computer program.
Duplancic Goran
Nizic Bene
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