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

TL;DR

This paper updates and archives four versions of electroweak libraries used in the KKMC Monte Carlo program, enhancing precision calculations for lepton and quark pair production at LEP/SLC energies and future colliders.

Contribution

It introduces updated electroweak libraries for KKMC, supporting high-precision Standard Model calculations and future collider studies, including FCC-ee.

Findings

Enhanced electroweak libraries for KKMC available

Supports precision Standard Model calculations from LEP era to future colliders

Useful for hadron collider applications like KKMC-hh and TauSpinner

Abstract

Since the {\tt 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 {\tt KKMC-hh} or {\tt TauSpinner} projects.