Artículo
The triple collinear limit of one-loop QCD amplitudes
Fecha de publicación:
04/2004
Editorial:
Elsevier Science
Revista:
Physics Letters B
ISSN:
0370-2693
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We consider the singular behaviour of one-loop QCD matrix elements when several external partons become simultaneously parallel. We present a new factorization formula that describes the singular collinear behaviour directly in colour space. The collinear singularities are embodied in process-independent splitting matrices that depend on the momenta, flavours, spins and colours of the collinear partons. We give the general structure of the infrared and ultraviolet divergences of the one-loop splitting matrices. We also present explicit one-loop results for the triple collinear splitting, q→qQ̄Q, of a quark and a quark-antiquark pair of different flavours. The one-loop triple collinear splitting is one of the ingredients that can be used to compute the evolution of parton distributions at the next-to-next-to-leading order in QCD perturbation theory.
Palabras clave:
Triple
,
Collinear
,
Amplitudes
,
Qcd
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Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Catani, Stefano; de Florian, Daniel Enrique; Rodrigo, Germán; The triple collinear limit of one-loop QCD amplitudes; Elsevier Science; Physics Letters B; 586; 3-4; 4-2004; 323-331
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