PYTHIA status report
Recent improvements in the PYTHIA event generator are summarized: new hard subprocesses, γ*γ* physics, QCD final-state showers, and more.
The Lund Model
Preface 1. Relativistic kinematics, electromagnetic fields and the method of virtual quanta 2. The harmonic oscillator and the quantum field 3. The vacuum as a dielectric medium and renormalisation 4. Deep inelastic scattering and the parton model 5. The classical motion of the massless relativistic string 6. The decay kinematics of the massless relativistic string 7. A stochastic process for string decay 8. The properties of the Lund model fragmentation formulae: external part formulas 9. The internal part fragmentation formulae and their relations to the unitarity equations of Regge theory 10. The dynamical analogues of the Lund model fragmentation formulae 11. Flavour and transverse momentum generation, and the vector to pseudoscalar meson ratio 12. Heavy quark fragmentation and Baryon production 13. The Hanbury-Brown-Twiss-effect and polarisation in the Lund model 14. The Lund gluon model, the kinematics and the decay properties 15. Gluon emission via the Bremsstrahlung process 16. Multigluon emission, the dipole moment and parton coherence cascade models 17. The lambda measure in the leading log, and the modified lead log approximation of perturbative QCD 18. The parton model and QCD 19. Inelastic lepto-production in the Lund model, the soft radiation model and heretical structure functions 20. Hadronic interaction models References Index.
A Quark Parton Model for Hadronic Fragmentation Distributions
Abstract The one-particle inclusive distributions in the fragmentation regions in hadronic interactions are described in a parameter free way by a simple additative quark parton model by means of the quark fragmentation functions measured in leptoproduction. We interpret the result so that while the main interaction in hadronic collisions is due to the wee partons almost all the momenta is carried by one of the valence quarks yielding fragmentation region distributions similar to the ones in leptoproduction.