Effective Field Theories with Instantons

Details Effective Field Theories with Instantons Effective Field Theories with Instantons

1993-08-03

arxiv.org/abs/hep-ph/9308212v1

Nucl.Phys.B420:94-117,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages (in harvmac little mode), HUTP-93/A021

Scientific paper

10.1016/0550-3213(94)90376-X

We explain how nonperturbative effects can be systematically included when constructing an effective field theory. We concentrate in particular on the matching calculation, by which a low energy theory without a heavy particle degree of freedom is matched onto the full theory. The matching calculation requires some new formalism, because for a large class of theories, instantons occur in a continuous range of scales from far below the mass of the heavy particle to far above. We show how the complete IR finiteness of the usual matching formalism arises in this new context. As an example, we formally integrate out a heavy quark in QCD. %%%% Includes 14 PiCTeX figures. %%%%

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