NNLO QCD calculations with CoLoRFulNNLO

The strong coupling is one fundamental parameter of the standard model. Its most precise determination is of fundamental importance. To contribute to the world average the calculation has to fit certain criteria. One of these is to have Next-to-Next-to-Leading Order accuracy in the fixed-order calculation. With the CoLoRFulNNLO subtraction method developed for electron-positron annihilation and new predictions become available at NNLO for observables such as the energy-energy correlation, we use this to extract the strong coupling using data measured by the OPAL and SLD detectors. To further enhance the region of validity of the predictions the fixed-order result was matched to already available resummed predictions.