Why Padé Approximants reduce the Renormalization-Scale dependence in QFT?

Details Why Padé Approximants reduce the Renormalization-Scale dependence in QFT? Why Padé Approximants reduce the Renormalization-Scale dependence in QFT?

1996-11-27

arxiv.org/abs/hep-ph/9611453v2

Phys.Rev. D56 (1997) 68-79

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, LateX. Replaced so that the figures would fit into the page size

Scientific paper

10.1103/PhysRevD.56.68

We prove that in the limit where the beta function is dominated by the 1-loop contribution (``large beta_0 limit'') diagonal Pad\'e Approximants (PA's) of perturbative series become exactly renormalization scale (RS) independent. This symmetry suggest that diagonal PA's are resumming correctly contributions from higher order diagrams that are responsible for the renormalization of the coupling-constant. Non-diagonal PA's are not exactly invariant, but generally reduce the RS dependence as compared to partial-sums. In physical cases, higher-order corrections in the beta function break the symmetry softly, introducing a small scale and scheme dependence. We also compare the Pad\'e resummation with the BLM method. We find that in the large-N_f limit using the BLM scale is identical to resumming the series by a $x[0/n]$ non-diagonal PA.

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