Regular Article - Theoretical Physics
The reggeon→2reggeons+particle vertex in the Lipatov effective action formalism
Department of High Energy Physics, University of S.Petersburg, 198904, St. Petersburg, Russia
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Revised: 17 February 2007
Published online: 1 June 2007
The vertex for gluon emission during the splitting of a reggeized gluon into two is constructed in the framework of the Lipatov effective action formalism. Its reduction to a pure transverse form for the diffractive amplitude gives the standard Bartels vertex plus an additional contribution, corresponding to the emission from a pointlike splitting vertex. This additional contribution turns out to be given by a longitudinal integral divergent both in the ultraviolet and infrared. A certain specific recipe for this part, including the principal value prescription for the integration, allows one to eliminate this unwanted contribution.
© Springer-Verlag Berlin Heidelberg, 2007