One universal extra dimension in Pythia

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 field... Title of program: PYTHIA Version number: 6.420 Catalogue Id: ACTU_v2_1 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. Versions of this program held in the CPC repository in Mendeley Data ACTU_v1_0; PYTHIA 5.7 AND JETSET 7.4; 10.1016/0010-4655(94)90132-5 ACTU_v2_0; PYTHIA V6.154; 10.1016/S0010-4655(00)00236-8 ACTU_v2_1; PYTHIA Version number: 6.420; 10.1016/j.cpc.2009.08.008 ACTU_v3_0; Pythia 8.1; 10.1016/j.cpc.2008.01.036 ACTU_v4_0; Pythia 8.2; 10.1016/j.cpc.2015.01.024 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)### 摘要 通用额外维度（Universal Extra Dimensions）模型已自6.4.18版本起被集成至PYTHIA事件生成器中，其实现采用仅含单个TeV⁻¹尺度额外维度的最简形式。此外，该实现还支持引力介导衰变过程：即通过数目可变的仅引力可通达的eV⁻¹尺度额外维度进行衰变。本实现覆盖标准模型粒子的最低能级卡鲁扎-克莱因（Kaluza-Klein, KK）激发态，但希格斯场的激发态除外…… 程序名称：PYTHIA 版本号：6.420 目录编号：ACTU_v2_1 问题属性：在高能基本粒子碰撞实验中，搜寻超出标准模型的物理现象，当前正对多种模型开展研究，其中额外维度模型是重点考察对象之一。 Mendeley数据馆藏的CPC程序库中收录的该程序版本如下： ACTU_v1_0；PYTHIA 5.7 与 JETSET 7.4；10.1016/0010-4655(94)90132-5 ACTU_v2_0；PYTHIA V6.154；10.1016/S0010-4655(00)00236-8 ACTU_v2_1；PYTHIA 版本6.420；10.1016/j.cpc.2009.08.008 ACTU_v3_0；Pythia 8.1；10.1016/j.cpc.2008.01.036 ACTU_v4_0；Pythia 8.2；10.1016/j.cpc.2015.01.024 本程序源自贝尔法斯特女王大学馆藏的CPC程序库（1969-2018年）。