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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 initialstate 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 squared 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-tonext-to-leading order) and on various factorization issues of mass singularities (starting from the next-to-next-to-next-to-leading order). © SISSA 2012.

Registro:

Documento: Artículo
Título:Space-like (vs. time-like) collinear limits in QCD: Is factorization violated?
Autor:Catani, S.; De Florian, D.; Rodrigo, G.
Filiación:INFN, Sezione di Firenze, Dipartimento di Fisica e Astronomia, Università di Firenze, I-50019 Sesto Fiorentino, Florence, Italy
Departamento de Física and IFIBA, FCEYN, Universidad de Buenos Aires, (1428) Pabellón 1 Ciudad Universitaria, Capital Federal, Argentina
Institut für Theoretische Physik, Universität Zürich, CH-8057 Zürich, Switzerland
Instituto de Física Corpuscular, UVEG - Consejo Superior de Investigaciones Científicas, Parc Cientìfic, E-46980 Paterna (Valencia), Spain
Palabras clave:Hadronic colliders; NLO computations
Año:2012
Volumen:2012
Número:7
DOI: http://dx.doi.org/10.1007/JHEP07(2012)026
Título revista:Journal of High Energy Physics
Título revista abreviado:J. High Energy Phys.
ISSN:11266708
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11266708_v2012_n7_p_Catani

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Citas:

---------- APA ----------
Catani, S., De Florian, D. & Rodrigo, G. (2012) . Space-like (vs. time-like) collinear limits in QCD: Is factorization violated?. Journal of High Energy Physics, 2012(7).
http://dx.doi.org/10.1007/JHEP07(2012)026
---------- CHICAGO ----------
Catani, S., De Florian, D., Rodrigo, G. "Space-like (vs. time-like) collinear limits in QCD: Is factorization violated?" . Journal of High Energy Physics 2012, no. 7 (2012).
http://dx.doi.org/10.1007/JHEP07(2012)026
---------- MLA ----------
Catani, S., De Florian, D., Rodrigo, G. "Space-like (vs. time-like) collinear limits in QCD: Is factorization violated?" . Journal of High Energy Physics, vol. 2012, no. 7, 2012.
http://dx.doi.org/10.1007/JHEP07(2012)026
---------- VANCOUVER ----------
Catani, S., De Florian, D., Rodrigo, G. Space-like (vs. time-like) collinear limits in QCD: Is factorization violated?. J. High Energy Phys. 2012;2012(7).
http://dx.doi.org/10.1007/JHEP07(2012)026