41 research outputs found
Total and diffractive cross sections in enhanced Pomeron scheme
For the first time, a systematic analysis of the high energy behavior of
total and diffractive proton-proton cross sections is performed within the
Reggeon Field Theory framework, based on the resummation of all significant
contributions of enhanced Pomeron diagrams to all orders with respect to the
triple-Pomeron coupling. The importance of different classes of enhanced graphs
is investigated and it is demonstrated that absorptive corrections due to
"net"-like enhanced diagrams and due to Pomeron "loops" are both significant
and none of those classes can be neglected at high energies. A comparison with
other approaches based on partial resummations of enhanced diagrams is
performed. In particular, important differences are found concerning the
predicted high energy behavior of total and single high mass diffraction
proton-proton cross sections, with our values of at
TeV being some % higher and with the energy rise of
saturating well below the LHC energy. The main
causes for those differences are analyzed and explained
Enhanced Pomeron diagrams: re-summation of unitarity cuts
Unitarity cuts of enhanced Pomeron diagrams are analyzed in the framework of
the Reggeon Field Theory. Assuming the validity of the
Abramovskii-Gribov-Kancheli cutting rules, we derive a complete set of cut
non-loop enhanced graphs and observe important cancellations between certain
sub-classes of the latter. We demonstrate also how the present method can be
generalized to take into consideration Pomeron loop contributions
Monte Carlo treatment of hadronic interactions in enhanced Pomeron scheme: I. QGSJET-II model
The construction of a Monte Carlo generator for high energy hadronic and
nuclear collisions is discussed in detail. Interactions are treated in the
framework of the Reggeon Field Theory, taking into consideration enhanced
Pomeron diagrams which are resummed to all orders in the triple-Pomeron
coupling. Soft and "semihard" contributions to the underlying parton dynamics
are accounted for within the "semihard Pomeron" approach. The structure of cut
enhanced diagrams is analyzed; they are regrouped into a number of subclasses
characterized by positively defined contributions which define partial weights
for various "macro-configurations" of hadronic final states. An iterative
procedure for a Monte Carlo generation of the structure of final states is
described. The model results for hadronic cross sections and for particle
production are compared to experimental data