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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]] ​  | 
 +| |