Non-Singlet Corrections of O(α_s^2 G_F M_t^2) to Γ(Z\to b\bar{b})

Details Non-Singlet Corrections of O(α_s^2 G_F M_t^2) to Γ(Z\to b\bar{b}) Non-Singlet Corrections of O(α_s^2 G_F M_t^2) to Γ(Z\to b\bar{b})

1999-02-26

arxiv.org/abs/hep-ph/9902480v1

Eur.Phys.J.C11:89-92,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 8 pages, 2 figures

Scientific paper

10.1007/s100520050616

The partial decay rate of the $Z$ boson into bottom quarks constitutes an important decay channel. This is mainly due to the virtual presence of the top quark in the loop diagrams giving rise to correction factors which are quadratic in the top quark mass. At one- and two-loop order it turned out that the leading term in the heavy-top expansion leads to very good approximations to the exact result. In this work the non-singlet diagrams at O(\alpha_s^2 G_F M_t^2) are considered.

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