The U-matrix unitarization scheme forces a geometric, correlated pomeron distribution, while the eikonal scheme gives a Poisson distribution, changing predicted particle multiplicities.
On the eikonal unitarisation at high energies
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abstract
We consider approaches to the eikonal-like unitarization of elastic amplitude and its generalizations in theories where cross-sections grow with energy, and we discuss corresponding mechanisms of the multiple exchange standing behind it. In particular, we argue that in such theories the weight of the $n$-fold exchanges can grow with $n$ much faster than for the simplest Glauber eikonal.
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Pomeron Weights in QCD Processes at High Energy and the $S$-Matrix Unitarity Constraint
The U-matrix unitarization scheme forces a geometric, correlated pomeron distribution, while the eikonal scheme gives a Poisson distribution, changing predicted particle multiplicities.