Article,

Adler Function, Sum Rules and Crewther Relation of Order O(alpha\_s^4): the Singlet Case

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(Jun 6, 2012)

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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