Speaker
Konstantin Chetyrkin
(Karlsruhe Institute of Technology)
Description
We discuss the current status of the ongoing analytical calculation of
the QCD beta-function in 5 loops as well as some new results in
investigating CBK (Crewther-Brodhurst-Kataev) relation in QCD. The
latter include the evaluation of the new singlet type contribution to
the Bjorken sum rule (first considered by Larin) which appears first
at 4-loop level only. We will also report on the calculation of the
gluino dependent terms to the same sum rule (this will allow to check
some non-trivial predictions of the $\beta$-expansion method (Kataev
and Mikhailov, 2014) and, thus, improve our understanding of the
corresponding optimization procedure.
Author
Konstantin Chetyrkin
(Karlsruhe Institute of Technology)
