Five-loop vacuum polarization in pQCD: O(m_q^2\alpha_s^4 n_f^2) contribution
High Energy Physics - Phenomenology
2008-11-26 v2
Abstract
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.
Cite
@article{arxiv.hep-ph/0212303,
title = {Five-loop vacuum polarization in pQCD: O(m_q^2\alpha_s^4 n_f^2) contribution},
author = {P. A. Baikov and K. G. Chetyrkin and J. H. Kühn},
journal= {arXiv preprint arXiv:hep-ph/0212303},
year = {2008}
}
Comments
The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/