The triple Pomeron vertex in large-N QCD and the pair-of-pants topology

Understand

We investigate the high energy behavior of QCD for different surface topologies of color graphs.

• After a brief review of the planar limit (bootstrap and gluon reggeization) and of the cylinder topology (BFKL) we investigate the 3 -> 3 scattering in the triple Regge limit which belongs to the pair-of-pants topology.
• We re-derive the triple Pomeron vertex function and show that it belongs to a specific set of graphs in color space which we identify as the analogue of the Mandelstam diagram.