Calculation of [Formula presented] and [Formula presented] couplings in QCD sum rules

Hungchong Kim, Su Houng Lee

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Abstract

We calculate the coupling constants [Formula presented] and [Formula presented] using QCD sum rules in the presence of an external meson field. A covariant derivative is introduced within the [Formula presented] interpolating field so that in the nonrelativistic limit the field dominantly reduces to two quarks in the [Formula presented]-wave state and one quark in the [Formula presented]-wave state. Our result for the couplings obtained by further making use of the soft-meson theorem qualitatively agrees with its phenomenological value extracted from the [Formula presented](1535) decay width. The prediction for the couplings, however, depends on the value of the quark-gluon condensate [Formula presented] which is also important in the calculation of the [Formula presented](1535) mass itself within the sum rule approach.

Original languageEnglish
Pages (from-to)4278-4281
Number of pages4
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume56
Issue number7
DOIs
Publication statusPublished - 1997 Jan 1

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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