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Space-like (vs. time-like) collinear limits in QCD: is factorization violated?

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Space-like (vs. time-like) collinear limits in QCD: is factorization violated?

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dc.contributor.author Catani, Stefano
dc.contributor.author de Florian, Daniel
dc.contributor.author Rodrigo García, Germán Vicente
dc.date.accessioned 2015-06-19T10:57:06Z
dc.date.available 2015-06-19T10:57:06Z
dc.date.issued 2012
dc.identifier.citation Catani, Stefano de Florian, Daniel Rodrigo García, Germán Vicente 2012 Space-like (vs. time-like) collinear limits in QCD: is factorization violated? Journal of High Energy Physics 07 7 026
dc.identifier.uri http://hdl.handle.net/10550/44599
dc.description.abstract We consider the singular behaviour of QCD scattering amplitudes in kinematical configurations where two or more momenta of the external partons become collinear. At the tree level, this behaviour is known to be controlled by factorization formulae in which the singular collinear factor is universal (process independent). We show that this strict (process-independent) factorization is not valid at one-loop and higher-loop orders in the case of the collinear limit in space-like regions (e.g., collinear radiation from initial-state partons). We introduce a generalized version of all-order collinear factorization, in which the space-like singular factors retain some dependence on the momentum and colour charge of the non-collinear partons. We present explicit results on one-loop and two-loop amplitudes for both the two-parton and multiparton collinear limits. At the level of square amplitudes and, more generally, cross sections in hadron--hadron collisions, the violation of strict collinear factorization has implications on the non-abelian structure of logarithmically-enhanced terms in perturbative calculations (starting from the next-to-next-to-leading order) and on various factorization issues of mass singularities (starting from the next-to-next-to-next-to-leading order).
dc.language.iso eng
dc.relation.ispartof Journal of High Energy Physics, 2012, vol. 07, num. 7, p. 026
dc.subject Física
dc.title Space-like (vs. time-like) collinear limits in QCD: is factorization violated?
dc.type journal article es_ES
dc.date.updated 2015-06-19T10:57:06Z
dc.identifier.doi 10.1007/JHEP07(2012)026
dc.identifier.idgrec 080416
dc.rights.accessRights open access es_ES

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