Oscillations of factorial cumulants to factorial moments ratio from an eikonal approach

We study the factorial moments (F-q), the factorial cumulants (K-q) and the ratio of K-q to F-q (H-q = K-q/F-q) in pp/p (p) over bar collisions using an updated approach, in which the multiplicity distribution is related to the eikonal function. The QCD inspired eikonal model adopted contains contributions of quark-quark, quark-gluon and gluon-gluon interactions. Our work shows that the approach can reproduce the collision energy dependence of the F-q moments, correctly predicts that the first minimum of the H-q lies around q = 5 and qualitatively reproduces the oscillations of the H-q moments, as shown in the experimental data and predicted by QCD at preasymptotic energy. The result of this study seems to indicate that the H-q oscillations are manifestations of semihard component in the multiparticle production process. Predictions for multiplicity distribution and H-q moments at the LHC energy root s = 14 TeV are presented. (C) 2013 Elsevier B.V. All rights reserved.