Speaker
Mr
Manuel Egner
(KIT TTP)
Description
NRQCD is a non-relativistic effective theory used, for example, to describe QCD bound states such as the $\Upsilon$(1S) meson. The matching of the effective theory NRQCD to the full theory QCD requires the calculation of matching coefficients. One of these matching coefficients, the matching coefficient of the vector current, plays an important role in the calculation of the decay width of the $\Upsilon$(1S) meson. The talk will focus on the calculation of this coefficient including two mass scales up to NNLO. Also the calculation of the scalar, pseudoscalar and axialvector current matching coefficients are presented.
Authors
Mr
Manuel Egner
(KIT TTP)
Dr
Matteo Fael
(KIT TTP)
Dr
Kay Schoenwald
(KIT TTP)
Prof.
Matthias Steinhauser
(KIT TTP)