Abstract
The analytic result for the singlet part of the Adler function of the vector
current in a general gauge theory is presented in five-loop approximation.
Comparing this result with the corresponding singlet part of the
Gross-Llewellyn Smith sum rule 1, we successfully demonstrate the validity of
the generalized Crewther relation for the singlet part. This provides a
non-trivial test of both our calculations and the generalized Crewther
relation. Combining the result with the already available non-singlet part of
the Adler function 2,3 we arrive at the complete \$O(\alpha\_s^4)\$
expression for the Adler function and, as a direct consequence, at the complete
\$O(\alpha\_s^4)\$ correction to the \$e^+ e^-\$ annihilation into hadrons in
a general gauge theory.
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