Use of the Double Dispersion Relation in QCD Sum Rules with External Fields

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概要

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• In QCD sum rules with external fields, the double dispersion relation is often used to represent the correlation function. In this work, we point out that the double spectral density, when it is determined by successive applications of the Borel transformation, contains spurious terms which should be kept in the subtraction terms in the double dispersion relation. They are zero under the Borel transformation, but, if the dispersion integral is restricted with QCD duality, they contribute to the continuum. For the simple case with zero external momentum, it is shown that subtracting out the spurious terms is equivalent to the QCD sum rules represented by the single dispersion relation.

• 理論物理学刊行会の論文
• 2000-05-25

著者

• Kim Hungchong

  Department Of Physics Tokyo Institute Of Technology

• KIM Hungchong

  Department of Physics, Tokyo Institute of Technology

関連論文

• QCD Sum Rules for Negative-Parity Baryons, S_(1535) and Λ(1405)(Recent Developments in QCD and Hadron Physics)
• Use of the Double Dispersion Relation in QCD Sum Rules with External Fields

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