Nonperturbative Decoupling and Effective Field Theory

Details Nonperturbative Decoupling and Effective Field Theory Nonperturbative Decoupling and Effective Field Theory

1993-10-29

arxiv.org/abs/hep-ph/9310373v2

Phys.Rev. D51 (1995) 1395-1401

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages no figures. HUTP-93-A019

Scientific paper

10.1103/PhysRevD.51.1395

We examine recent claims that nonperturbative effects can prevent the decoupling of a heavy fermion whose mass arises from a Yukawa coupling to a scalar field. We show that in weakly coupled, four dimensional models such as the standard model with heavy mirror fermions the effects of the heavy fermions can always be accounted for by {\it local} operators involving light fields. We contrast this with the case of the 1+1 dimensional Abelian Higgs model, in which there does not appear to be a local effective field theory describing the low energy physics when heavy fermions are integrated out. (Mailer corruption hopefully fixed!)

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