http://hdl.handle.net/20.500.12128/217
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 sin2θeff 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 sin2θeff 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 |
URI: | http://hdl.handle.net/20.500.12128/217 |
DOI: | 10.1016/j.physletb.2016.09.012 |
ISSN: | 0370-2693 |
Pojawia się w kolekcji: | Artykuły (WNŚiT) |
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Dubovyk_The_two_loop_electroweak_bosonic_corrections_to.pdf | 452,17 kB | Adobe PDF | Przejrzyj / Otwórz |
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