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Effective Field Theory for Ultrasoft Momenta in NRQCD and NRQED

A. Pineda, J. Soto

hep-pharXiv:hep-ph/9707481

Abstract

We propose an effective field theory for heavy quark-antiquark bound states once the soft gluons have been integrated out. We also give new results for the matching between QCD (QED) and NRQCD (NRQED).

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