Two-loop fermionic electroweak corrections to the Z-boson width and production rate

Abstract

Improved predictions for the Z-boson decay width and the hadronic Z-peak cross-section within the Standard Model are presented, based on a complete calculation of electroweak two-loop corrections with closed fermion loops. Compared to previous partial results, the predictions for the Z width and hadronic cross-section shift by about 0.6 MeV and 0.004 nb, respectively. Compact parametrization formulae are provided, which approximate the full results to better than 4 ppm.

7 pages; v2: few typos fixed and minor corrections of numbers in tables

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• Light Neutralino Dark Matter: Direct/Indirect Detection and Collider Searches
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• Electroweak Precision Tests of the Standard Model after the Discovery of the Higgs Boson
• Electroweak pseudo-observables and Z-boson form factors at two-loop accuracy
• Extending the Analysis of Electroweak Precision Constraints in Composite Higgs Models
• Numerical multi-loop integrals and applications
• Update of the electroweak precision fit, interplay with Higgs-boson signal strengths and model-independent constraints on new physics
• Leading fermionic three-loop corrections to electroweak precision observables
• Constraints on a Very Light Sbottom
• GRIFFIN: A C++ library for electroweak radiative corrections in fermion scattering and decay processes
• Improved strong coupling determinations from hadronic decays of electroweak bosons at N${}^3$LO accuracy
• Mixed EW-QCD leading fermionic three-loop corrections at $\mathcal{O}({\alpha }_s{\alpha }^2)$ to electroweak precision observables
• Electroweak precision tests in the LHC era and Z-decay form factors at two-loop level
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• Lepton Universality Test of Extra Leptons using Hadron Decay
• Electric charge renormalization to all orders
• Leading fermionic three-loop corrections to electroweak precision observables