Speaker
Arnd Behring
(CERN)
Description
The rho parameter is an important Standard Model precision observable. It is currently known to four-loop order in QCD in the limit of vanishing bottom quark mass. When the rho parameter was calculated at three-loop order with exact bottom quark mass dependence, it was discovered that elliptic integrals enter the results. In this talk, we report on the status of our calculation of the rho parameter at four-loop order in QCD with exact dependence on the bottom quark mass with a particular emphasis on the mathematical structure of the integrals that enter the results.
