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Title: Electroweak bosonic 2-loop corrections to the Z-pole precision observables
Authors: Dubovyk, Ievgen
Gluza, Janusz
Freitas, Ayres
Riemann, Tord
Usovitsch, Johann
Keywords: cząstki elementarne; oddziaływania elektrosłabe; Bozon Higgsa
Issue Date: 2017
Citation: Acta Physica Polonica B, Vol. 48, no. 12 (2017), s. 2321-2329
Abstract: Precision measurements of properties of the electroweak W - and Z-bosons provide strong constraints on the Standard Model (SM) and extensions thereof. This sensitivity crucially depends on the availability of accurate theoretical predictions for these quantities, including higher-order radiative corrections. This contribution gives a brief overview of available calculations and compares the estimate of theory uncertainties with the projected experimental precision of future e(+)e(-) collider proposals. Then it is shown how numerical Mellin-Barnes integrals can be used to evaluate higher-order loop integrals that depend on three or more independent mass and momentum scales. As a concrete physical application, the complete two-loop corrections to Z -> b (b) over bar are considered.
DOI: 10.5506/APhysPolB.48.2321
ISSN: 0587-4254
Appears in Collections:Artykuły (WNŚiT)

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