The properties of C-parameter and coupling constants

In this article, we present the properties of the C-parameter which is one of event shape variables. We obtain the coupling constants both in the perturbative and in the non-perturbative part of the QCD theory. To achieve this we fit the dispersive model as well as the shape function model with our data. Our results are consistent with the QCD predictions. We explain more features of our results in the main text.