SEZIONE DI MILANO
I will review recent progress in our understanding of the infrared structure of multi-particle gauge theory amplitudes, paying special attention to the high-energy (`Regge') limit. For massless gauge theories, the multi-particle soft anomalous dimension is known to have a remarkably simple, dipole-like form up to very high orders in perturbation theory, and subleading multipole corrections are currently a subject of intense studies. In the high-energy limit, the dipole formula leads to a simple factorized expression for the amplitude, which automatically implies Reggeization of singular contributions to t-channel exchanges. Furthermore, one can study the breakdown of Regge-pole factorization at high energy, starting at NNLL, and provide explicit expressions for the leading Regge-cut contributions to high-energy logarithms. Lorenzo Magnea - Torino Univ.

DATA: 02-02-2014