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Título

Gluon Regge trajectory at two loops from Lipatov's high energy effective action

AutorChachamis, G. CSIC ORCID; Hentschinski, Martin CSIC ORCID; Madrigal Martínez, José Daniel CSIC; Sabio Vera, Agustín CSIC ORCID
Palabras claveMellin-barnes integrals
BFKL pomeron
QCD
Reggeization
Approximations
Decorrelation
Singularity
Scattering
Collisions
Amplitude
Fecha de publicación11-nov-2013
EditorElsevier
CitaciónNuclear Physics - Section B 876 (2): 453-472 (2013)
ResumenWe present the derivation of the two-loop gluon Regge trajectory using Lipatov's high energy effective action and a direct evaluation of Feynman diagrams. Using a gauge invariant regularization of high energy divergences by deforming the light-cone vectors of the effective action, we determine the two-loop self-energy of the reggeized gluon, after computing the master integrals involved using the Mellin-Barnes representations technique. The self-energy is further matched to QCD through a recently proposed subtraction prescription. The Regge trajectory of the gluon is then defined through renormalization of the reggeized gluon propagator with respect to high energy divergences. Our result is in agreement with previous computations in the literature, providing a non-trivial test of the effective action and the proposed subtraction and renormalization framework.
Versión del editorhttp://dx.doi.org/10.1016/j.nuclphysb.2013.08.013
URIhttp://hdl.handle.net/10261/125347
DOI10.1016/j.nuclphysb.2013.08.013
ISSN0550-3213
E-ISSN1873-1562
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