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preprints:1995:ttp95-13 [2016/03/17 11:03] (current)
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 +====== TTP95-13 QCD Corrections from Top Quark to Relations ​ between Electroweak Parameters to Order $\as^2$ ====== 
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 +   <​hidden TTP95-13 ​ QCD Corrections from Top Quark to Relations ​ between Electroweak Parameters to Order $\as^2$ > The vacuum polarization functions $\Pi(q^2)$ of charged and neutral  
 + gauge bosons which arise from top and bottom quark loops lead to  
 + ​important shifts in relations between electroweak parameters 
 + which can be measured with ever-increasing precision. The large 
 + mass of the top quark allows approximation of these functions through 
 + the first two terms of an expansion in $M_Z^2/​M_t^2$. 
 + The first three terms of the Taylor series of $\Pi(q^2)$ are  
 + ​evaluated analytically up to order $\as^2$.  
 + The first two are required to derive the approximation,​ the 
 + third can be used to demonstrate the smallness of the neglected terms. 
 + The paper 
 + ​improves earlier results  
 + based on the leading term $\propto G_F M_t^2 \as^2$.  
 + ​Results for the subleading 
 + ​contributions to $\dr$ and the effective mixing angle $\sineff$ are presented. 
 + </​hidden>​ 
 +|**K.G. Chetyrkin, J.H. Kuehn, M. Steinhauser** ​ |  
 +|** Phys. Rev. Lett. 75 3394-3397 1995  **  | 
 +| {{preprints:​1995:​ttp95-13.pdf|PDF}} {{preprints:​1995:​ttp95-13.ps|PostScript}} [[http://​arxiv.org/​abs/​hep-ph/​9504413|arXiv]] ​  | 
 +| |