One universal extra dimension in Pythia

M. ElKacimi, D. Goujdami, H Przysiezniak, P. Skands

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

The Universal Extra Dimensions model has been implemented in the Pythia generator from version 6.4.18 onwards, in its minimal formulation with one TeV-1-sized extra dimension. The additional possibility of gravity-mediated decays, through a variable number of eV-1-sized extra dimensions into which only gravity extends, is also available. The implementation covers the lowest lying Kaluza-Klein (KK) excitations of Standard Model particles, except for the excitations of the Higgs fields, with the mass spectrum calculated at one loop. 2 → 2 tree-level production cross sections and unpolarized KK number conserving 2-body decays are included. Mixing between iso-doublet and -singlet KK excitations is neglected thus far, and is expected to be negligible for all but the top sector. New version summary: Program title: PYTHIA Version number: 6.420. Catalogue identifier: ACTU_v2_1. Program summary URL: http://cpc.cs.qub.ac.uk/summaries/ACTU_v2_1.html. Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland. Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html. No. of lines in distributed program, including test data, etc.: 79 362. No. of bytes in distributed program, including test data, etc.: 590 900. Distribution format: tar.gz. Programming language: Fortran 77. Computer: CERN lxplus and any other machine with a Fortran 77 compiler. Operating system: Linux Red Hat. RAM: about 800 K words. Word size: 32 bits. Classification: 11.2. Catalogue identifier of previous version: ACTU_v2_0. Journal reference of previous version: Comput. Phys. Comm. 135 (2001) 238. Does the new version supersede the previous version?: Yes. Nature of problem: At high energy collisions between elementary particles, physics beyond the Standard Model is searched for. Many models are being investigated, namely extra-dimensional models. Solution method: The Universal Extra Dimension model is implemented in the PYTHIA event generator. Reasons for new version: The Universal Extra Dimensions model has been implemented in the PYTHIA generator from version 6.4.18 onwards, in its minimal formulation with one TeV-1-sized extra dimension. The additional possibility of gravity-mediated decays, through a variable number of eV-1-sized extra dimensions into which only gravity extends, is also available. The implementation covers the lowest lying Kaluza-Klein (KK) excitations of Standard Model particles, except for the excitations of the Higgs fields, with the mass spectrum calculated at one loop. 2 → 2 tree-level production cross sections and unpolarized KK number conserving 2-body decays are included. Mixing between iso-doublet and -singlet KK excitations is neglected thus far, and is expected to be negligible for all but the top sector. Running time: 10-1000 events per second, depending on the process studied.

Original languageEnglish
Pages (from-to)122-127
Number of pages6
JournalComputer Physics Communications
Volume181
Issue number1
DOIs
Publication statusPublished - Jan 2010
Externally publishedYes

Keywords

  • Elementary particle physics
  • Events generators
  • Universal extra dimension

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