Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-19
Phys.Lett.B559:245-251,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/
Scientific paper
10.1016/S0370-2693(03)00186-2
We present the analytical calculation of the contribution of order m_q^2 \alpha_s^4 n_f^2 to the absorptive part of the vacuum polarization function of vector currents. This term constitutes an important gauge-invariant part of the full O(m_q^2 alpha_s^4) correction to the total cross-section of e^+ e^- annihilation into hadrons. The results are compared to predictions following from various optimization schemes.
Baikov P. A.
Chetyrkin K. G.
Kuhn Johann H.
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