Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-09
J.Phys.A34:1451-1457,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, LaTeX, 2 tables; certain numerical examples added
Scientific paper
10.1088/0305-4470/34/7/316
The conformal mapping of the Borel plane can be utilized for the analytic continuation of the Borel transform to the entire positive real semi-axis and is thus helpful in the resummation of divergent perturbation series in quantum field theory. We observe that the rate of convergence can be improved by the application of Pad\'{e} approximants to the Borel transform expressed as a function of the conformal variable, i.e. by a combination of the analytic continuation via conformal mapping and a subsequent numerical approximation by rational approximants. The method is primarily useful in those cases where the leading (but not sub-leading) large-order asymptotics of the perturbative coefficients are known.
Jentschura Ulrich D.
Soff Gerhard
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