| Article | |
| Report number | hep-ph/0312067 ; CERN-TH-2003-206 |
| Title | The triple collinear limit of one-loop QCD amplitudes |
| Author(s) | Catani, S ; de Florian, D ; Rodrigo, Germán |
| Affiliation | (CERN) |
| Publication | 2004 |
| Imprint | 4 Dec 2003 |
| Number of pages | 11 |
| In: | Phys. Lett. B 586 (2004) 323-331 |
| DOI | 10.1016/j.physletb.2004.02.039 |
| Subject category | Particle Physics - Phenomenology |
| Abstract | 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, $q \to q {\bar Q} Q$, 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. |
Corresponding record in: Inspire
Email contact: german.rodrigo@cern.ch
Record created 2003-12-06, last modified 2018-09-24