HATHOR – HAdronic Top and Heavy quarks crOss section calculatoR

We present a program to calculate the total cross section for top-quark pair production in hadronic collisions. The program takes into account recent theoretical developments such as approximate next-to-next-to-leading order perturbative QCD corrections and it allows for studies of the theoretical uncertainty by separate variations of the factorization and renormalization scales. In addition it offers the possibility to obtain the cross section as a function of the running top-quark mass. The program can also be applied to a hypothetical fourth quark family provided the QCD couplings are standard.Program summaryProgram title: HathorCatalogue identifier: AEID_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEID_v1_0.htmlProgram obtainable from: CPC Program Library, Queen's University, Belfast, N. IrelandLicensing provisions: GNU GPL 3No. of lines in distributed program, including test data, etc.: 5405No. of bytes in distributed program, including test data, etc.: 327 718Distribution format: tar.gzProgramming language: C++, Fortran, JavaComputer: Standard PCs (x86, x86_64 processors)Operating system: LinuxRAM: 256 MBClassification: 11.1External routines: Interface to LHAPDF for the user's choice of parton distribution functions, see http://projects.hepforge.org/lhapdf/Nature of problem: Computation of total cross section in perturbative QCD.Solution method: Numerical integration of hard parton cross section convoluted with parton distribution functions.Running time: A few seconds to a few minutes on standard desktop PCs or notebooks, depending on the chosen options.