The U-matrix unitarization scheme forces a geometric, correlated pomeron distribution, while the eikonal scheme gives a Poisson distribution, changing predicted particle multiplicities.
How many of the scaling trends in $pp$ collisions will be violated at sqrt{s_NN} = 14 TeV ? - Predictions from Monte Carlo quark-gluon string model
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abstract
Multiplicity, rapidity and transverse momentum distributions of hadrons produced both in inelastic and nondiffractive $pp$ collisions at energies from $\sqrt{s} = 200$\,GeV to 14\,TeV are studied within the Monte Carlo quark-gluon string model (QGSM). Good agreement with the available experimental data up to $\sqrt{s} = 13$\,TeV is obtained, and predictions are made for the collisions at top LHC energy $\sqrt{s} = 14$\,TeV. The model indicates that Feynman scaling and extended longitudinal scaling remain valid in the fragmentation regions, whereas strong violation of Feynman scaling is observed at midrapidity. The Koba-Nielsen-Olesen (KNO) scaling in multiplicity distributions is violated at LHC also. The origin of both maintenance and violation of the scaling trends is traced to short range correlations of particles in the strings and interplay between the multistring processes at ultrarelativistic 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.