Institute for Theoretical Particle Physics (TTP)

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preprints:2010:ttp10-14 [2016/03/15 20:38] (current)
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 +====== TTP10-14 R(s), Bjorken sum rule and the Crewther Relation in order alpha_s^4 ====== 
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 +<hidden TTP10-14  R(s), Bjorken sum rule and the Crewther Relation in order alpha_s^4 > We report on our calculation of  the order alpha_s^4 
 + contributions to the Bjorken sum rule for  polarized electron-nucleon  scattering 
 + and to the (non-singlet) part of the cross section for electron-positron 
 + annihilation into hadrons for the  case of a  generic colour gauge group. 
 + We confirm at the same order a (generalized) 
 + Crewther relation between the Bjorken sum rule and the corresponding Adler function  which provides a strong test 
 + of the correctness of our previously obtained  results:  the ratio R(s) in QCD 
 + and the five-loop beta-function in  quenched QED. 
 + </hidden> 
 +|**K.G. Chetyrkin**  |  
 +| {{preprints:2010:ttp10-14.pdf|PDF}} {{preprints:2010:ttp10-14.ps|PostScript}}   | 
 +| |