Welcome to DiffTop

DiffTop is the Fortran-based package which allows the user to calculate the differential and total cross section for heavy-quark pair production at hadron colliders in One-particle inclusive (1PI) kinematics. The cross sections are calculated in perturbative QCD at approximate next-to-next-to-leading order (approx.NNLO) by using methods of threshold resummation beyond the leading logarithmic accuracy.
Predictions for transverse momentum and rapidity distributions of top quarks produced in proton-proton collisions at the LHC at 7, 8 and 13 TeV are available.
At present, only the simultaneous variation of the renormalisation and factorisation scales is allowed. The new version of the code will include additional terms, allowing for intependent variation of the QCD scales.

The code is interfaced to the QCD analysis package HERAFitter via fastNLOtoolkit .