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2011

An infrared approach to Reggeization

Del Duca, Vittorio, Duhr, Claude, Gardi, Einan et al.

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We present a new approach to Reggeization of gauge amplitudes based on the universal properties of their infrared singularities.

Using the "dipole formula", a compact ansatz for all infrared singularities of massless amplitudes, we study Reggeization of singular contributions to high-energy amplitudes for arbitrary color representations, and any logarithmic accuracy.
We derive leading-logarithmic Reggeization for general cross-channel color exchanges, and we show that Reggeization breaks down for the imaginary part of the amplitude at next-to-leading logarithms and for the real part at next-to-next-to-leading logarithms.
Our formalism applies to multiparticle amplitudes in multi-Regge kinematics, and constrains possible corrections to the dipole formula starting at three loops.

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