Applications of the large mass expansion
Fleischer, Jochem
Kotikov, AV
Veretin, OL
The method of the large mass expansion (LME) is investigated for selfenergy and vertex functions in two-loop order. It has the technical advantage that in many cases the expansion coefficients can be expressed analytically. As long as only one non-zero external momentum squared, q(2), is involved also the Taylor expansion (TE) w.r.t. small q(2) yields high precision results in a domain sufficient for most applications. In the case of only one non-zero mass M and only one external momentum squared, the expansion w.r.t. q(2)/M-2 is identical for the TE and the LME. In this case the combined techniques yield analytic expressions for many diagrams, which are quite easy to handle numerically.
ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS
1998
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https://pub.uni-bielefeld.de/record/1624714
Fleischer J, Kotikov AV, Veretin OL. Applications of the large mass expansion. <em>ACTA PHYSICA POLONICA B</em>. 1998;29(10):2611-2625.
eng
info:eu-repo/semantics/altIdentifier/issn/0587-4254
info:eu-repo/semantics/altIdentifier/wos/000076331600007
info:eu-repo/semantics/altIdentifier/arxiv/hep-ph/9808243
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