The Monte Carlo Program KKMC, for the Lepton or Quark Pair Production at LEP/SLC Energies—Updates of electroweak calculations

• Published in: Computer physics communications 2021-03, Vol.260, p.107734, Article 107734
• Main Authors: Arbuzov, A., Jadach, S., Wa̧s, Z., Ward, B.F.L., Yost, S.A.
• Format: Article
• Language: English
• Subjects: Electroweak corrections; Monte Carlo; Standard Model
• ISSN: 0010-4655; 1879-2944
• DOI: 10.1016/j.cpc.2020.107734

Since the KKMC program was published for the first time over 20 years ago, it has gained popularity and was exploited in a broad spectrum of applications. The core part of the program itself did not change much. In contrast, some of the libraries have evolved substantially. The aim of this publication is to archive four versions, alternative to the one published 20 years ago versions of the electroweak libraries (or just parameter initialization versions), which were instrumental for the precision Standard Model calculation from the end of LEP era till now and for the sake of the future applications/comparisons for the future electron–positron colliders, in particular for the FCC-ee related studies. These electroweak libraries are useful for the hadron collider applications as well, for instance for KKMC-hh or TauSpinner projects. Program Title: KKMC CPC Library link to program files:http://dx.doi.org/10.17632/8w4vrpttpc.1 Licensing provisions: GPL-3.0 Programming language: FORTRAN 77 Journal reference of previous version: Comput. Phys. Commun. 130 (2000) 260 Does the new version supersede the previous version?: No Reasons for the new version: The basic reason is the upgrade of the DIZET electroweak library. The KKMC Monte Carlo [1] is designed to simulate two fermion production process in the electron–positron colliders, e+e−→2fnγ, (f=μ,τ,u,d,c,s,b,ν,f≠e ). It is armed with the most advanced QED matrix element based on the coherent exclusive exponentiation (CEEX) of the initial and final state bremsstrahlung, valid up to the highest FCC-ee energies [2,3]. The detailed description of how to use the KKMC Monte Carlo program can be found in Ref. [1]. The physics content of the version 4.16 which we will use in the present paper as a reference is explained in Ref. [3]. For further details see references therein and KKMC webpage [4], where up to date development versions of KKMC can also be found. For novel applications and for further references see e.g. Ref. [5]. The differences of the new KKMC program versions, with respect to the published ones, are not big – the structure of the program and user interface have not changed. In particular the methodology of interfacing electroweak corrections calculation to the core KKMC code still follows the prescription given in Ref. [1]. Now, when the FCC effort takes momentum, it is a good time to archive the KKMC program, its cross-checks and documentation, for the future references. The important first step in this d