# CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION

Fleischer J, TARASOV OV (1994)
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 64(3): 413-425.

Journal Article | Published | English

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Abstract
A new powerful method to calculate Feynman diagrams is proposed. It consists in setting up a Taylor series expansion in the external momenta squared (in general multivariable). The Taylor coefficients are obtained from the original diagram by differentiation and putting the external momenta equal to zero, which means a great simplification. It is demonstrated that it is possible to obtain by analytic continuation of the original series high precision numerical values of the Feynman integrals in the whole cut plane. For this purpose conformal mapping and subsequent resummation by means of Pade approximants or Levin transformation are applied.
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Fleischer J, TARASOV OV. CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. 1994;64(3):413-425.
Fleischer, J., & TARASOV, O. V. (1994). CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 64(3), 413-425.
Fleischer, J., and TARASOV, O. V. (1994). CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 64, 413-425.
Fleischer, J., & TARASOV, O.V., 1994. CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 64(3), p 413-425.
J. Fleischer and O.V. TARASOV, “CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION”, ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, vol. 64, 1994, pp. 413-425.
Fleischer, J., TARASOV, O.V.: CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS. 64, 413-425 (1994).
Fleischer, Jochem, and TARASOV, OV. “CALCULATION OF FEYNMAN DIAGRAMS FROM THEIR SMALL MOMENTUM EXPANSION”. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 64.3 (1994): 413-425.
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arXiv hep-ph/9403230

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