arXiv:hep-ph/9310229·v1·High Energy Physics — Phenomenology

Flavour Singlet $O (α_{s}^{2} m_{b}^{2} / m_{t}^{2})$ Corrections to the Partial Decay Rate $Γ (Z \to b b ˉ)$

Abstract

We analytically compute the flavour singlet $O (α_{s}^{2} m_{b}^{2} / m_{t}^{2})$ radiative corrections to the partial decay rate $Γ (Z \to b b ˉ)$ . These corrections arise from anomalous ``double traingle'' diagrams containing a single $γ_{5}$ matrix inside each of two closed fermion loops. They represent the next-to-leading term of the asymptotic expansion in the inverse large top mass. As a byproduct of the calculcation we confirm the results of B.Kniehl and J.H.Kühn for the flavour singlet massless corrections \cite{KniKue90} as well as our previous $O (α_{s}^{2} m_{b}^{2} / M_{Z}^{2})$ result \cite{CheKwi93}.

Comments: 9 pages, 2 figures (eps-files will be ftp'ed on request)

Flavour Singlet O(αs2​mb2​/mt2​) Corrections to the Partial Decay Rate Γ(Z→bbˉ)

Abstract

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Flavour Singlet $O (α_{s}^{2} m_{b}^{2} / m_{t}^{2})$ Corrections to the Partial Decay Rate $Γ (Z \to b b ˉ)$

Citation historyopen in Citation History ↗