Features of the libraryCOLLIER is a fortran library for the numerical evaluation of one-loop scalar and tensor integrals appearing in perturbative relativistic quantum field theory with the following features:
scalar and tensor integrals for high particle multiplicities dimensional regularization for ultraviolet divergences
dimensional regularization for soft infrared divergences dimensional regularization or mass regularization for collinear mass singularities
complex internal masses (for unstable particles) fully supported
numerically dangerous regions (small Gram or other kinematical determinants) two independent implementations of all basic building blocks allow for internal cross-checks cache system to speed up calculations If you use Collier for a publication, please cite all the references listed here. |