The U-matrix unitarization scheme forces a geometric, correlated pomeron distribution, while the eikonal scheme gives a Poisson distribution, changing predicted particle multiplicities.
The proton inelastic cross section at ultrahigh energies
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abstract
We study the consequences of high-energy collider data on the best fits to total, elastic, and inelastic cross sections for $pp$ and $p\bar{p}$ scattering using two very distinct unitarisation schemes: the eikonal and the $U$-matrix. Despite their analytic differences, we find that the two schemes lead to almost identical predictions up to EeV energies, with differences only becoming significant at GUT-scale and higher energies.
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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.