Testing an approximation to large-Nc QCD with a toy model

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Published 1 February 2002 • Published under licence by IOP Publishing Ltd
, , Citation Maarten Golterman et al JHEP01(2002)024 DOI 10.1088/1126-6708/2002/01/024

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1 Institute for Nuclear Theory, University of Washington, Box 351550, Seattle, WA 98195, USA

2 Department of Physics and Astronomy, San Francisco State University, 1600 Holloway Ave, San Francisco, CA 94132, USA

3 Grup de Física Teòrica and IFAE Universitat Autònoma de Barcelona, 08193 Barcelona, Spain

4 Centre de Physique Théorique, CNRS-Luminy, Case 907, F-13288 Marseille Cedex 9, France

Dates

  1. Received 5 December 2001
  2. Accepted 18 January 2002
  3. Published

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Abstract

We consider a simple model of large-Nc QCD defined by a spectrum consisting of an infinite set of equally spaced zero-width vector resonances. This model is an excellent theoretical laboratory for investigating certain approximation schemes which have been used recently in calculations of hadronic parameters, such as the Minimal Hadronic Approximation. We also comment on some of the questions concerning issues of local duality versus global duality and finite-energy sum rules.

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10.1088/1126-6708/2002/01/024