Large mass expansion versus small momentum expansion of Feynman diagrams

Fleischer J, Kalmykov MY, Veretin OL (1998)
PHYSICS LETTERS B 427(1-2): 141-146.

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The method of the large mass expansion (LME) has the technical advantage that two-loop integrals occur only as bubbles with large masses. In many cases only one large mass occurs. In such cases these integrals are expressible in terms of Gamma-functions, i.e. they can be handled completely analytically avoiding even recursions and therefore this approach may find a wide field of application. We consider it necessary to investigate the precision of this method and test it for several two-loop vertex functions ocurring in the Z --> decay by comparing it with the small momentum expansion. It turns out that in general high order approximants have ro be taken into account for a sufficient accuracy. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
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Fleischer J, Kalmykov MY, Veretin OL. Large mass expansion versus small momentum expansion of Feynman diagrams. PHYSICS LETTERS B. 1998;427(1-2):141-146.
Fleischer, J., Kalmykov, M. Y., & Veretin, O. L. (1998). Large mass expansion versus small momentum expansion of Feynman diagrams. PHYSICS LETTERS B, 427(1-2), 141-146.
Fleischer, J., Kalmykov, M. Y., and Veretin, O. L. (1998). Large mass expansion versus small momentum expansion of Feynman diagrams. PHYSICS LETTERS B 427, 141-146.
Fleischer, J., Kalmykov, M.Y., & Veretin, O.L., 1998. Large mass expansion versus small momentum expansion of Feynman diagrams. PHYSICS LETTERS B, 427(1-2), p 141-146.
J. Fleischer, M.Y. Kalmykov, and O.L. Veretin, “Large mass expansion versus small momentum expansion of Feynman diagrams”, PHYSICS LETTERS B, vol. 427, 1998, pp. 141-146.
Fleischer, J., Kalmykov, M.Y., Veretin, O.L.: Large mass expansion versus small momentum expansion of Feynman diagrams. PHYSICS LETTERS B. 427, 141-146 (1998).
Fleischer, Jochem, Kalmykov, MY, and Veretin, OL. “Large mass expansion versus small momentum expansion of Feynman diagrams”. PHYSICS LETTERS B 427.1-2 (1998): 141-146.
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