A model calculation of the value of the electromagnetic coupling constant at $q^2 = m_{Z}^{2}$

A QCD model with an infinite number of vector mesons suggested by one of the authors is used to derive the value of the correction δα hadr for α ( m 2 Z ) due to the strong interactions. The result is δα hadr = 0 . 0275(2) ; thus α ( m 2 Z ) = (128 . 96(3)) − 1 . The aim of this work is to obtain the contribution of strong interactions to the value of α = α ( m 2 Z ). The more exact knowledge of the value of α allows to improve the predictions for the t -quark and Higgs boson masses [1-4].