Speaker
Dr
Andrey Grozin
(Budker Institute of Nuclear Physics)
Description
The QCD/HQET matching coefficient for the heavy-quark field
is calculated up to four loops.
It must be finite;
this requirement produces analytical results for some terms
in the four-loop on-shell heavy-quark field renormalization constant
which were previously only known numerically.
The effect of a non-zero lighter-flavor mass is calculated up to three loops.
By specifying our result to QED, we obtain the relation
between the electron field and the Bloch--Nordsieck field
with four-loop accuracy.
Primary author
Dr
Andrey Grozin
(Budker Institute of Nuclear Physics)
Co-authors
Dr
Alexander Smirnov
(Moscow State University)
Prof.
Matthias Steinhauser
(Karlsruher Institut für Technologie)
Dr
Peter Marquard
(DESY)
Dr
Vladimir Smirnov
(Skobeltsyn Institute of Nuclear Physics of Moscow State University)
