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Tytuł: The two-loop electroweak bosonic corrections to sin2[theta]b/eff
Autor: Dubovyk, Ievgen
Freitas, Ayres
Gluza, Janusz
Riemann, Tord
Usovitsch, Johann
Słowa kluczowe: electroweak; two-loop
Data wydania: 2016
Źródło: Physics Letters B, Vol. 762, [10 November] (2016), s. 184-189
Abstrakt: The prediction of the effective electroweak mixing angle sin2⁡θeff b in the Standard Model at two-loop accuracy has now been completed by the first calculation of the bosonic two-loop corrections to the Zb¯b vertex. Numerical predictions are presented in the form of a fitting formula as function of MZ,MW,MH,mt and Δα, αs. For central input values, we obtain a relative correction of Δκb (α2,bos)=−0.9855×10−4, amounting to about a quarter of the fermionic corrections, and corresponding to sin2⁡θeff b=0.232704. The integration of the corresponding two-loop vertex Feynman integrals with up to three dimensionless parameters in Minkowskian kinematics has been performed with two approaches: (i) Sector decomposition, implemented in the packages FIESTA 3 and SecDec 3, and (ii) Mellin–Barnes representations, implemented in AMBRE 3/MB and the new package MBnumerics
DOI: 10.1016/j.physletb.2016.09.012
ISSN: 0370-2693
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