Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-01-20
Phys.Rev.Lett.104:132004,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, results and some auxiliary formulas from the paper are put in an extra file ABC.res in a form readable for Mathematic
Scientific paper
10.1103/PhysRevLett.104.132004
We compute, for the first time, the order alpha_s^4 contributions to the Bjorken sum rule for polarized electron-nucleon scattering and to the (non-singlet) Adler function for the case of a generic colour gauge group. We confirm at the same order a (generalized) Crewther relation which provides a strong test of the correctness of our previously obtained results: the QCD Adler function and the five-loop beta-function in quenched QED. In particular, the appearance of an irrational contribution proportional to zeta_3 in the latter quantity is confirmed. We obtain the commensurate scale equation relating the effective strong coupling constants as inferred from the Bjorken sum rule and from the Adler function at order alpha_s^4.
Baikov P. A.
Chetyrkin K. G.
Kuhn Johann H.
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