Institute for Theoretical Particle Physics (TTP)

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

preprints:1995:ttp95-13 [2016/03/17 11:03] (current)
Line 1: Line 1:
 +====== TTP95-13 QCD Corrections from Top Quark to Relations  between Electroweak Parameters to Order $\as^2$ ====== 
 +  
 +  
 +   <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]]   | 
 +| |