Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-11-18
Phys.Lett. B556 (2003) 135-141
Physics
High Energy Physics
High Energy Physics - Phenomenology
final version to appear in PLB; few references added
Scientific paper
10.1016/S0370-2693(03)00124-2
We show that some Lorentz components of the Feynman integrals calculated in terms of the light-cone variables may contain end-point singularities which originate from the contribution of the big-circle integral in the complex k_ plane. These singularities appear in various types of diagrams (two-point functions, three-point functions, etc) and provide the covariance of the Feynman integrals on the light-cone. We propose a procedure for calculating Feynman integrals which guarantees that the end-point singularities do not appear in the light-cone representations of the invariant amplitudes.
Melikhov Dmitri
Simula Silvano
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