HATHOR – HA dronic T op and H eavy quarks cr O ss section calculato

We present a program to calculate the total cross section for top-quark pair production in hadronic collisions. The program takes into account rece nt theoretical developments such as approximate next-to-next-to-leading order pertur bative QCD corrections and it allows for studies of the theoretical uncertainty by separa te v riations of the factorization and renormalization scales. In addition it o ffers the possibility to obtain the cross section as a function of the running top-quark mass. The prog ram can also be applied to a hypothetical fourth quark family provided the QCD coupl ings are standard. Program summary Title of program: Hathor Version: 1.0 Catalogue number: Program summary URL: http://www.physik.hu-berlin.de/pep/tools http://www-zeuthen.desy.de/ ̃moch/hathor E-mail: sven-olaf.moch@desy.de, peter.uwer@physik.hu-berlin.de License: GNU Public License Computers: Standard PCs (x86, x86_64 processors) Operating system: Linux Program language: C++, fortran, Java Memory required to execute: 256 MB Other programs called: None. External files needed: Interface to LHAPDF for the user’s choice of parton distribu t on functions, seehttp://projects.hepforge.org/lhapdf/.