Hard diffractive scattering in high energy ep collisions and the Monte Carlo Generator RAPGAP

Abstract The program RAPGAP generates events in ep collisions where the electron is scattered on a pomeron P coupled to the proton p. A gap in rapidity between the fast moving proton and the remaining hadronic system is observed. The program is applicable to photoproduction (Q^2{reversed tilde equals} 0) as well as deep inelastic scattering (Q^2> 0). Different types of hard interaction processes such as γ* q → q′ and γrg → q q ̄ for light and heavy quarks are included. Several options for the para... Title of program: RAPGAP version 1.0 Catalogue Id: ADAR_v1_0 Nature of problem Inelastic ep scattering is an ideal tool to study properties of a possible partonic (quark or gluon) nature of the pomeron. Partonic interactions of the photon with quarks and gluon coming from the pomeron are calculated. Such kind of events have a gap in energyflow between the fast moving proton and the rest of the hadronic system. Such events have been found recently in the experiments at the HERA collider [1,2]. Versions of this program held in the CPC repository in Mendeley Data ADAR_v1_0; RAPGAP version 1.0; 10.1016/0010-4655(94)00150-Z This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)摘要 程序RAPGAP可生成电子与耦合至质子p的坡密子（pomeron）发生散射时的电子-质子（ep）碰撞事件，此时可观测到快速运动的质子与剩余强子系统之间存在快度间隙。该程序既可应用于光生过程（Q²≈0），也可用于深度非弹性散射（Q²>0），涵盖了针对轻夸克与重夸克的多种硬相互作用过程，例如γ*q→q′及γrg→q q̄。本程序支持多项参数可选配置（原文未完整展示）。 程序名称：RAPGAP 版本1.0 目录编号：ADAR_v1_0 问题本质 非弹性电子-质子散射是研究坡密子（pomeron）可能具有的部分子（parton，即夸克或胶子）属性的理想工具。本程序将计算光子与来自坡密子的夸克、胶子之间的部分子相互作用。此类事件在快速运动的质子与其余强子系统之间存在能流间隙（快度间隙），这类事件近期已在HERA对撞机的实验中被观测到[1,2]。 Mendeley数据收录的CPC程序库中该程序的版本 ADAR_v1_0；RAPGAP 版本1.0；10.1016/0010-4655(94)00150-Z 本程序源自贝尔法斯特女王大学托管的CPC程序库（1969-2019）