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

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 had...

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Bibliographic Details
Published in:Physics letters. B 2014-03, Vol.730, p.50-52
Main Author: Freitas, Ayres
Format: Article
Language:English
Subjects:
Approximation
Cross sections (physics)
Decay
Elementary particles
Fermions
Mathematical models
Parametrization
Standard model (particle physics)
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Summary: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2014.01.017