The dipole model Monte Carlo generator Sartre 1

We present the Monte Carlo generator Sartre for simulating diffractive exclusive vector meson production and DVCS in electron–proton, electron–ion, and hadron–hadron collisions.Program summaryProgram title: Sartre 1.0Catalogue identifier: AESP_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AESP_v1_0.htmlProgram obtainable from: CPC Program Library, Queen’s University, Belfast, N. IrelandLicensing provisions: GNU General Public License, version 2No. of lines in distributed program, including test data, etc.: 703313No. of bytes in distributed program, including test data, etc.: 179406465Distribution format: tar.gzProgramming language: C/C++.Computer: Any with standard C/C++ compiler.Operating system: Tested on Linux and MacOS.Classification: 11.1, 11.2, 11.6.External routines: ROOT and GSL for numeric algorithms and other various tasks throughout the program. BOOST for multi-threaded integration (optional), GEMINI++ for nuclear break-up and CUBA for multi-dimensional numerical integration (the latter two supplied with the program package). Uses cmake for building and installing.Nature of the problem:Simulate diffractive exclusive vector meson and deeply virtual Compton scattering (DVCS) production in electron–nucleus scattering where the exchanged virtual photon interacts coherently with a large region of the nucleus. To calculate the cross section correctly it has to be averaged over all possible configurations of nucleon positions within the nucleus.Solution method:To make an arithmetic average of the quantum mechanical amplitude over nucleon configurations numerically and store the result in look-up tables.Implemented processes: The following processes can be simulated: e+p→e′+V+p′e+p→e′+V+p′e+A→e′+V+A′e+A→e′+V+A′p+p→p′+V+p′p+p→p′+V+p′p+A→p′+V+A′p+A→p′+V+A′equation(1)A+A→A′+V+A′A+A→A′+V+A′ where VV is a J/ψ,φJ/ψ,φ, or ρρ vector meson, or a real photon (DVCS). All processes are mediated by a virtual photon and a pomeron. The present version is applicable for these processes at future electron–hadron colliders, such as the EIC and the LHeC, as well as HERA, RHIC, and the LHC.Restrictions:The program is reliable for process at xp<10−2xp<10−2, and large β=x/xpβ=x/xp.Additional comments:The distribution file for this program is over 178 MB and therefore is not delivered directly when download or E-mail is requested. Instead an html file giving details of how the program can be obtained is sent.Running time:On a MacBook Pro with a 2.66 GHz Intel Core i7 processor, event generation takes ∼0.1 ms/event without correction and nuclear breakup, ∼0.2 ms/event with the recommended corrections switched on, and ∼6 ms/event when running with corrections and nuclear breakup.