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

Arbuzov, A. B.; Jadach, S.; Wa̧s, Z.; Ward, B. F. L.; Yost, S. A.

doi:10.1016/j.cpc.2020.107734

Cited by 25 publications

(35 citation statements)

References 13 publications

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“…The choice of the scheme was motivated to minimize parametric uncertainties, which are larger if α(M Z ) or M W is used as input as in case of some other schemes. An attempt to archive distinct versions of EW libraries was made in [26]. These results and methods may need to be reproducible at the time of future FCC or other future experiments.…”

Section: Discussionmentioning

confidence: 99%

“…Definition of form factors follows the one of the DIZET libraries [25,26] and is as used for spin amplitudes in the KKMC Monte Carlo as well. They are used in the Improved Born, formula (1), of TauSpinner too.…”

Section: Improved Born and Electroweak Form Factorsmentioning

confidence: 99%

“…The versions of the DIZET EW correction library, which are used in our numerical discussion, are presented briefly in Appendix F; details are given in Ref. [26]. Specification of initializations is collected in Appendix B.1.…”

Section: Electroweak Corrections In Tauspinner: Library Versions and Initializationsmentioning

confidence: 99%

“…That is why in Ref. [26] several versions of the present and past EW DIZET library were collected. On the other hand, archived with [23] less popular calculations of the past will not receive our attention.…”

Section: Electroweak Corrections In Tauspinner: Library Versions and Initializationsmentioning

confidence: 99%

“…Reference. [26] summarizes numerically most important upgrades of EW library DIZET. Some numerical comparisons of its variants are collected in Sect.…”

Section: Introductionmentioning

confidence: 99%

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Adequacy of Effective Born for electroweak effects and TauSpinner algorithms for high energy physics simulated samples

Richter-Wąs

Wa̧s

2022

Eur. Phys. J. Plus

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Matching and comparing the measurements of past and future experiments call for consistency checks of electroweak (EW) calculations used for their interpretation. On the other hand, new calculation schemes of the field theory can be beneficial for precision, even if they may obscure comparisons with earlier results. Over the years, concepts of Improved Born, Effective Born, as well as of effective couplings, in particular of $$\sin ^2\theta _W^{{\textit{eff}}}$$ sin 2 θ W eff mixing angle for EW interactions, have evolved. In our discussion, we use four versions of EW library for phenomenology of practically all HEP accelerator experiments over the last 30 years. We rely on the codes published and archived with the Monte Carlo program for $$e^+e^- \rightarrow f {\bar{f}} n(\gamma )$$ e + e - → f f ¯ n ( γ ) and available for the as well. re-weighs generated events for introduction of EW effects. To this end, is first invoked, and its results are stored in data file and later used. Documentation of upgrade, to version 2.1.0, and that of its new arrangement for semi-automated benchmark plots are provided. In our paper, focus is placed on the numerical results, on the different approximations introduced in Improved Born to obtain Effective Born, which is simpler for applications of strong or QED processes in pp or $$e^+e^-$$ e + e - colliders. The $$\tau $$ τ lepton polarization $$P_{\tau }$$ P τ , forward–backward asymmetry $$A_{{\textit{FB}}}$$ A FB and parton-level total cross section $$\sigma ^{{\textit{tot}}}$$ σ tot are used to monitor the size of EW effects and effective $$\sin ^2\theta _W^{{\textit{eff}}}$$ sin 2 θ W eff picture limitations for precision physics. Collected results include: (i) Effective Born approximations and $$\sin ^2\theta _W^{{\textit{eff}}}$$ sin 2 θ W eff , (ii) differences between versions of EW libraries and (iii) parametric uncertainties due to, for example, $$m_t$$ m t or $$\Delta \alpha _h^{(5)}(s)$$ Δ α h ( 5 ) ( s ) . These results can be considered as benchmarks and also allow to evaluate the adequacy of Effective Born with respect to Improved Born. Definitions are addressed too.

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Section: Discussionmentioning

confidence: 99%

Section: Improved Born and Electroweak Form Factorsmentioning

confidence: 99%

Section: Electroweak Corrections In Tauspinner: Library Versions and Initializationsmentioning

confidence: 99%

Section: Electroweak Corrections In Tauspinner: Library Versions and Initializationsmentioning

confidence: 99%

“…Reference. [26] summarizes numerically most important upgrades of EW library DIZET. Some numerical comparisons of its variants are collected in Sect.…”

Section: Introductionmentioning

confidence: 99%

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