KKMCee 5 is a multi-photon Monte Carlo event generator KKMCee for lepton and quark pair production in lepton colliders.

This is a web page of KKMCee 5 Monte Carlo event generator [1] for lepton and quark pair production for the high energy electron-positron annihilation process. It is still the most sophisticated event generator for such processes. Its entire source code is rewritten in the modern C++ language. It reproduces all features of the older KKMCee code in Fortran 77 [2]. However, a number of improvements in the Monte Carlo algorithm are also implemented. Most importantly, it is intended to be a starting point for future improvements (for example described in 2303.14260), which will be mandatory for future high-precision lepton collider projects.

The current version is KKMCee 5.02 which can be downloaded from: https://github.com/KrakowHEPSoft/KKMCee/releases

For installation, we recommend following the HowToStart file.

Any questions or comments can be directed to [email protected]

[1] S. Jadach, B. F. L. Ward, Z. Was, S. A. Yost and A. Siodmok, “Multi-photon Monte Carlo event generator KKMCee for lepton and quark pair production in lepton colliders”, Comput. Phys. Commun. 283 (2023) 108556, [2204.11949].

[2] S. Jadach, B. F. L. Ward and Z. Was, “The Precision Monte Carlo event generator KK for two fermion final states in e+e− collisions”, Comput. Phys. Commun. 130 (2000) 260.