Institute for Theoretical Particle Physics (TTP)

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preprints:2002:ttp02-45 [2016/03/17 11:03] (current)
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 +====== TTP02-45 Five-loop vacuum polarization in pQCD: O(m_q^2\alpha_s^4 n_f^2) contribution ====== 
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 +   <hidden TTP02-45  Five-loop vacuum polarization in pQCD: O(m_q^2\alpha_s^4 n_f^2) contribution > We present the analytical calculation of the contribution of order 
 + m_q^2 \alpha_s^4 n_f^2 to the absorptive part of the vacuum 
 + polarization function of vector currents. This term constitutes an 
 + important gauge-invariant part of the full O(m_q^2 alpha_s^4) 
 + correction to the total cross-section of e^+ e^- annihilation into 
 + hadrons.  The results are compared to predictions following from 
 + various optimization schemes. 
 + </hidden> 
 +|**P.A. Baikov, K.G. Chetyrkin and J.H. K\"uhn**  |  
 +|**  Phys.Lett.B  559 245-251 2003  **  | 
 +| {{preprints:2002:ttp02-45.pdf|PDF}} {{preprints:2002:ttp02-45.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0212303|arXiv]]   | 
 +| |