Fritz W. Bopp

Particle production in hadron-hadron collisions at collider energies in an exclusive multi-string fragmentation model

AbstractParticle production in soft hadron-hadron collisions at collider energies is investigated in a two-step dual parton model. In the initial collision color-singlets or strings of hadronic matter are formed from constituents of the incident particles. These strings subsequently decay into chains of hadrons, analogously to the

The multistring fragmentation model and violation of KNO scaling

q\bar q

Two simple measures for the structure ofe+e− hadronization

system in low energye+e− physics. Relying on the Monte-Carlo method we generate exclusive events and evaluate quantities of interest which include inclusive and semi-inclusive pseudorapidity spectra, topological cross-section, correlations and charge transfer distributions.

Time Symmetric Quantum Mechanics and Causal Classical Physics

Abstract.The process of baryon number transfer due to string junction propagation in rapidity space is considered. It leads to a significant effect in the net baryon production in pA collisions at mid-rapidities and an even more significant effect in the forward hemisphere for the cases of πA interactions. The results of numerical calculations in the framework of the Quark-Gluon String Model are in reasonable agreement with the data. Special consideration is given to Λ produced in π-A collisions extracted from the data of the WA89 Collaboration.

DYNAMICAL CORRELATIONS IN THE DUAL PARTON MODEL

The violation of Koba-Nielsen-Olesen scaling of the multiplicity distribution is studied in detail within the dual multistring fragmentation model. Comparison with recent data from the CERN-SPS proton-antiproton collider reveals a close agreement.

A method to compare quark and gluon jets in\(e^ + e^ - \to q\bar qg\) hadronisation

The difference between the proton and the antiproton distributions and the charged pion distribution are compared at largePT and agreement is found with a model attributing baryons to final state rearrangement of hard scattered partons. The model contains a dual topological suppression of baryonic clusters at largePT which is partially balanced as the cluster decay distribution into baryons is peaked at higher values of the momentum fractionz. The model implies positive correlations between antiproton triggers and opposite side protons.

Analysing the angular distribution of jets ine+e− annihilation

The paper presents two measures, which are infrared stable and which easily relate to known properties of soft hadronic jets. The measures allow for an approximate addition of contributions from individual phases in multistep processes; the contributions from typical initial parton configurations, from evoluting jets and from final state (confinement) fluctuations are evaluated with suitable approximations in a general quantum chromodynamical framework.

Rapidity gaps and the PHOJET Monte Carlo

A two boundary quantum mechanics without time ordered causal structure is advocated as consistent theory. The apparent causal structure of usual “near future” macroscopic phenomena is attributed to a cosmological asymmetry and to rules governing the transition between microscopic to macroscopic observations. Our interest is a heuristic understanding of the resulting macroscopic physics.