One universal extra dimension in Pythia

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→22→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 summaryProgram title: PYTHIA Version number: 6.420Catalogue identifier: ACTU_v2_1Program summary URL:http://cpc.cs.qub.ac.uk/summaries/ACTU_v2_1.htmlProgram obtainable from: CPC Program Library, Queen's University, Belfast, N. IrelandLicensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.htmlNo. of lines in distributed program, including test data, etc.: 79 362No. of bytes in distributed program, including test data, etc.: 590 900Distribution format: tar.gzProgramming language: Fortran 77Computer: CERN lxplus and any other machine with a Fortran 77 compilerOperating system: Linux Red HatRAM: about 800 K wordsWord size: 32 bitsClassification: 11.2Catalogue identifier of previous version: ACTU_v2_0Journal reference of previous version: Comput. Phys. Comm. 135 (2001) 238Does the new version supersede the previous version?: YesNature 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→22→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.