Multi-gluon helicity amplitudes with one off-shell leg within high energy factorization

Abstract

Basing on the Slavnov-Taylor identities, we derive a new prescription to obtain gauge invariant tree-level scattering amplitudes for the process g*g->Ng within high energy factorization. Using the helicity method, we check the formalism up to several final state gluons, and we present analytical formulas for the the helicity amplitudes for N=2. We also compare the method with Lipatov's effective action approach.

arXiv comment25 pages, quite a few figures, an appendix added, typos corrected

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