Uses and Abuses of Effective Lagrangians

Details Uses and Abuses of Effective Lagrangians Uses and Abuses of Effective Lagrangians

1992-03-18

arxiv.org/abs/hep-ph/9203216v3

Phys.Rev.D48:4337-4351,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages

Scientific paper

10.1103/PhysRevD.48.4337

Motivated by past and recent analyses we critically re-examine the use of effective lagrangians in the literature to constrain new physics and to determine the `physics reach' of future experiments. We demonstrate that many calculations, such as those involving anomalous trilinear gauge-boson couplings, either considerably overestimate loop-induced effects, or give ambiguous answers. The source of these problems is the use of cutoffs to evaluate the size of such operators in loop diagrams. In contrast to other critics of these loop estimates, we prove that the inclusion of nonlinearly-realized gauge invariance into the low-energy lagrangian is irrelevant to this conclusion. We use an explicit example using known multi-Higgs physics above the weak scale to underline these points. We show how to draw conclusions regarding the nature of the unknown high-energy physics without making reference to low-energy cutoffs.

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