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GiBUU

Table of Contents

  1. The GiBUU project
    1. General Info
    2. Using GiBUU
    3. Documentation
    4. About GiBUU
    5. External Projects
    6. Trivia
    7. For Developers
    8. Contact
    9. Privacy Policy
  2. GiBUU model
    1. Further reading
  3. Getting the GiBUU code
    1. Download as tar balls
    2. Public git access (via GitHub)
  4. Publications
    1. Diploma theses
    2. PhD theses
    3. INSPIRE Database
  5. The History of BUU Codes at Giessen
  6. The GiBUU Team
    1. Privacy Policy
    2. Contact

The GiBUU project

The GiBUU project provides a unified theory and transport framework in the MeV and GeV energy regimes for

  • elementary reactions on nuclei, as e.g.
    • electron + A,
    • photon + A,
    • neutrino + A ,
    • hadron + A (especially pion + A and proton + A)
  • and for A + A heavy-ion collisions,

using the same physics input and code. The GiBUU code provides a full dynamical description of the reaction and delivers the complete final state of an event; it can thus be used as an event generator. The source code is freely available.

For all the reactions, the flow of particles is modeled within the quantum-kinetic Boltzmann-Uehling-Uhlenbeck (BUU) framework. The relevant degrees of freedom are mesons and baryons, which propagate in mean fields and scatter according to cross sections which are applicable to the energy range of a few 10 MeV to about 40 GeV; incoming lepton energies can go up to 1 TeV. In the higher energy regimes the concept of pre-hadronic interactions is implemented in order to realize color transparency and formation time effects. For a general overview of the model, its theoretical basis as well as many practical details, refer to the review paper:

Transport-theoretical Description of Nuclear Reactions
O. Buss, T. Gaitanos, K. Gallmeister, H. van Hees, M. Kaskulov, O. Lalakulich, A. B. Larionov, T. Leitner, J. Weil, U. Mosel
​Phys. Rept. 512 (2012) 1-124 / ​Inspire

The numerical implementation, named GiBUU (aka The Giessen BUU Project), is written in modular Fortran 2003 and based upon a ​Subversion version control system, which allows for a concise control over the full development phase of the code.

The history of the code is rather long and reports about several main development steps. The present initiative accomplished a total rewrite of the source code in a present-day computing language. The main goals of this effort were modularization to allow for a more transparent multi-user development process, a strict reduction of global variables for a more transparent debugging procedure, an improved control over the development phase such that modifications can be backtracked and a unified standard version. Therefore every member of the team works on the same single code version, albeit different temporal branches may coexist. Possible technical overhead is compensated by the benefit of a faster distribution of improvements and innovations and their enhanced sustainability.

GiBUU is being developed by a collaboration of people at different institutes:

News

  • 5. Jan. 2025: GiBUU 2025 has been released.
    • event output possible using HepMC3 library (neutrino and electron inits)
    • event output possible using NuHepMC standard (neutrino init, thanks to ​https:// github.com/sjgardiner/GiBUU and ​https://github.com/jxi24/GiBUU)
    • neutrino init: low-Q2-limit for electrons improved, proper approach to real photon limit
    • sampe job cards added for T2K and SBND with explicit in-medium options
    • bug fix for RootTuple (thanks to Pedro Pasquini)
    • real photon init: shadowing for VMD included
    • HiPion init: add Coulomb correction of incoming beam (as for LoPion)
    • HiPion init: simple Glauber estimates (quantum mechanical and classical) added
    • alternative form of s-wave absorption of pi-N-Delta dynamics at low pion energies implemented
    • radius and surface as explicit input parameters for Woods-Saxon density distributions
    • use mass of resonance as cut-off in W-dependence of form factors
    • line "version=2025" mandatory in jobcard to avoid outdated jobcards
    • Makefile also for new Intel compiler ifx
    • refactoring, cosmetics, minor improvements and bug fixes

General Info

The GiBUU Model

The GiBUU Team

Using GiBUU

Documentation

About GiBUU

External Projects

Trivia

  • The name of the project and its pronounciation should not be confused with a german coffee seller (Hamburg)
  • In the germanic languages before the adoption of the latin alphabet, ​Runes were used. ​The seventh rune, looking similar to the letter 'X', has a pronounciation as 'gebo'. Its meaning is ​gift, present. (cf. K.Düwel, "Runenkunde", Springer, 2008 ​https://doi.org/10.1007/978-3-476-01419-1)
  • 'gibuu' translates to 'wolf' in the Gitxsan and Nisga'a languages ​wikipedia ​dictionary
  • 3 examples what ChatGPT claims that GiBUU stands for: (all wrong, see top of page)
    • Generalized event generator for Baryon-Unified Unitarity
    • Generalized Budget for Ultra-relativistic Unitarity
    • Generalized event generator for baryon-induced ultrarelativistic reactions

For Developers

Contact

Privacy Policy

Privacy Policy

Last modified 3 weeks ago Last modified on Jan 6, 2025, 4:36:17 PM