R(s) and Z decay in order α_s^4: complete results
arXiv:1210.3594
Abstract
We report on our calculation of the order α_s^4 axial singlet contributions for the decay rates of the Z-boson as well as the vector singlet contribution to the cross section for electron-positron annihilation into hadrons. Together with recently finished O(α_s^4) calculations of the non-signlet corrections [1,2], the new results directly lead us to the first complete O(α_s^4) predictions for the total hadronic decay rate of the Z-boson and the ratio R(s).
8 pages, 1 figure. Contribution to Proceedings of "10th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology)" - Radcor2011, September 26-30, 2011, Mamallapuram, India