Wednesday, July 31, 2013

1307.7741 (G. Chachamis et al.)

Computing the full two-loop gluon Regge trajectory within Lipatov's high
energy effective action

G. Chachamis, M. Hentschinski, J. D. Madrigal, A. Sabio Vera
We discuss computational details of our recent result, namely, the first derivation of the two-loop gluon Regge trajectory within the framework of Lipatov's high energy effective action. In particular, we elaborate on the direct evaluation of Feynman two-loop diagrams by using the Mellin-Barnes representations technique. Our result is in precise agreement with previous computations in the literature, providing this way a highly non-trivial test of the effective action and the proposed subtraction and renormalization scheme combined with our approach for the treatment of the loop diagrams.
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