The Pythia program can be used to generate high-energy-physics ''events'', i.e. sets of outgoing particles produced in the interactions between two incoming particles. The objective is to provide as accurate as possible a representation of event properties in a wide range of reactions, within and beyond the Standard Model, with emphasis on those where strong interactions play a role, directly or indirectly, and therefore multihadronic final states are produced. The physics is then not understood well enough to give an exact description; instead the program has to be based on a combination of analytical results and various QCD-based models. This physics input is summarized here, for areas such as hard subprocesses, initial- and final-state parton showers, underlying events and beam remnants, fragmentation and decays, and much more. Furthermore, extensive information is provided on all program elements: subroutines and functions, switches and parameters, and particle and process data. This should allow the user to tailor the generation task to the topics of interest.

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PYTHIA 6.4 Physics and Manual

Theory and phenomenology of two-Higgs-doublet models

Theories with Gauge-Mediated Supersymmetry Breaking

QCD factorization for exclusive non-leptonic B-meson decays: General arguments and the case of heavy-light final states

Nonlinear Realization and Hidden Local Symmetries

A gravitino-goldstino high-energy equivalence theorem

Discrete Flavour Groups, 13 and Lepton Flavour Violation

Testing for heavier vector bosons in e+e− at Z peak. A comparative study of different models

https://archive-ouverte.unige.ch/unige:91335/ATTACHMENT01

On the coupling of heavy mesons to pions in QCD

The possibility that both vector and axial-vector bound states could originate from a strong interacting sector of the electroweak theory is considered. A simple Lagrangian parametrization is presented where the bound states are described as gauge vector bosons of a local, nonlinearly realized, SU(2) ⊗ SU(2) symmetry. At present the model is mostly constrained from data on W and Z masses and on neutrino-nucleon deep inelastic scattering. High energy e+e− tests are suggested where visible deviations from the standard model predictions could take place. These deviations exhibit a certain pattern which allows to distinguish the model from other theoretical frameworks. We find that precise measurements of W and Z masses and asymmetries in e+e− collisions could put strong restrictions on the parameters of the model if no appreciable deviations are found from the standard model, except for a case with the vector and axial-vector bosons degenerate in mass and coupling. General differences with respect to technicolor are pointed out.

F. Feruglio

Papers

A gravitino-goldstino high-energy equivalence theorem

Discrete Flavour Groups, 13 and Lepton Flavour Violation

Testing for heavier vector bosons in e+e− at Z peak. A comparative study of different models

On the coupling of heavy mesons to pions in QCD

Vector and Axial-Vector Bound States from a Strongly Interacting Electroweak Sector