Two-photon physics with GALUGA 2.0

Abstract AAn extended version of the Monte Carlo program GALUGA is presented for the computation of two-photon production in e^+ e^-collisions. Functions implemented for the five γ*γ* structure functions now include several ansätze of the total hadronic cross section based on the BFKL Pomeron and various Regge-like models. In addition, structure functions for resonance formation are included with full dependence on the two-photon virtualities Q^2 _1and Q^2 _2as given in the constituent-quark mode... Title of program: GALUGA Catalogue Id: ADHE_v1_0 Nature of Problem Hadronic two-photon reactions in a new energy domain are becoming accessible with LEP2. Unlike purely electroweak processes, hadronic processes contain dominant non-perturbative components parametrized by suitable structure functions, which are functions of the two-photon invariant mass W and the photon virtualities Q1 and Q2. It is hence advantageous to have a Monte Carlo program that can generate events with the possibility to keep W and, optionally, Qi at fixed, user-defined values. Moreover, ... Versions of this program held in the CPC repository in Mendeley Data ADHE_v1_0; ADHE_v1_0.tar; 10.1016/S0010-4655(97)00127-6 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)摘要 本文提出了蒙特卡洛程序GALUGA的扩展版本，用于计算正负电子对撞中的双光子产生过程。针对五组虚光子对（γ*γ*）结构函数，现已实现多款基于BFKL波梅隆（BFKL Pomeron）及各类雷奇类模型（Regge-like models）的强子总截面假设形式。此外，还纳入了共振形成所需的结构函数，其完整依赖于组分夸克模型中给出的双光子虚度Q²₁与Q²₂…… 程序名称：GALUGA 目录编号：ADHE_v1_0 问题本质 随着大型正负电子对撞机2号（LEP2）的投入运行，新能区的强子双光子反应研究逐渐成为可能。与纯电弱过程不同，强子过程包含占主导地位的非微扰分量，这类分量通过合适的结构函数进行参数化，而结构函数是双光子不变质量W以及光子虚度Q₁、Q₂的函数。因此，开发一款能够生成事例，并可将W以及（可选的）光子虚度Qᵢ固定为用户自定义值的蒙特卡洛程序，将具备显著优势。此外，…… 本程序在曼德利数据（Mendeley Data）的CPC程序库中的版本为：ADHE_v1_0; ADHE_v1_0.tar; 10.1016/S0010-4655(97)00127-6 本程序源自贝尔法斯特女王大学（1969-2018年）维护的CPC程序库