TTP12-009 $R(s)$ and Z decay in order $\alpha_s^4$: complete results
TTP12-009 $R(s)$ and Z decay in order $\alpha_s^4$: complete results
P. A. Baikov, K. G. Chetyrkin, J. H. Kühn, J. Rittinger
PoS RADCOR2011 030 2011
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arXiv