WPHACT 2.0: A fully massive Monte Carlo generator for four fermion physics at e + e − colliders

Abstract WPHACT 2.0 is the new fully massive version of a MC program and unweighted event generator which computes all Standard Model processes with four fermions in the final state at e^+e^-colliders. The program can now generate unweighted events for any subset of all four fermion final states in a single run, by making use of dedicated pre-samples which can cover the entire phase space. Improvements with respect to WPHACT 1.0 include the Imaginary Fermion Loop gauge restoring scheme, new phase ... Title of program: WPHACT, version 2.0 Catalogue Id: ADEN_v2_0 [ADQW] Nature of problem All e+e- Standard Model (SM) processes with four fermion final states are necessary for detailed studies of the properties of the W and of the Higgs bosons, for measuring double and single boson production, for high precision tests of the SM and for evaluating backgrounds to searches. One wants therefore a Monte Carlo event generator which provides an accurate description of all four fermion processes in the largest possible region of phase space and which can be used for realistic experimental ... Versions of this program held in the CPC repository in Mendeley Data ADEN_v2_0; WPHACT, version 2.0; 10.1016/S0010-4655(02)00685-9 ADEN_v1_0; WPHACT; 10.1016/S0010-4655(96)00124-5 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)**摘要** WPHACT 2.0是一款全新的全质量版蒙特卡洛（Monte Carlo, MC）程序与无加权事件生成器，可计算正负电子对撞机末态含四费米子的全部标准模型（Standard Model, SM）过程。本程序可借助可覆盖完整相空间的专用预采样技术，在单次运行中为所有四费米子末态的任意子集生成无加权事件。相较于WPHACT 1.0的改进内容包括虚费米子圈（Imaginary Fermion Loop）规范恢复方案、全新的相空间…… **程序名称**：WPHACT，版本2.0 **目录编号**：ADEN_v2_0 [ADQW] **问题本质** 所有末态包含四费米子的正负电子对撞标准模型过程，是开展W玻色子与希格斯玻色子性质详细研究、测量双玻色子与单玻色子产生过程、进行标准模型高精度检验以及为搜寻实验背景估值提供支撑的核心基础。因此亟需一款蒙特卡洛事件生成器，能够在尽可能宽广的相空间范围内精准描述所有四费米子过程，并可应用于真实的实验…… **门德里莱数据（Mendeley Data）中CPC程序库收录的该程序版本** ADEN_v2_0; WPHACT, 版本2.0; 10.1016/S0010-4655(02)00685-9 ADEN_v1_0; WPHACT; 10.1016/S0010-4655(96)00124-5 本程序源自贝尔法斯特女王大学馆藏的CPC程序库（1969-2019）。