Determination of pion-baryon coupling constants from QCD sum rules

Abstract

We evaluate the pi-N-N, pi-Sigma-Sigma and pi-Sigma-Lambda coupling constants using QCD sum rules based on pion-to-vacuum matrix elements of correlators of two interpolating baryon fields. The parts of the correlators with Dirac structure k-slash gamma_5 are used, keeping all terms up to dimension 5 in the OPE and including continuum contributions on the phenomenological side. The ratios of these sum rules to baryon mass sum rules yield stable results with values for the couplings of g_{pi NN}=12+/-5, g_{pi Sigma Sigma}=7+/-4 and g_{pi Sigma Lambda}=6+/-3. The sources of uncertainty are discussed.

20 pages (RevTeX), 1 figure (attached). Revised version with corrected form for Y2 piece of hyperon correlators; numerical results differ from previous version

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Cited by in corpus (16)

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• QCD sum rule calculation of the $\pi NN$ coupling-revisited
• g_{πΛΣ} and g_{K ΣΞ} from QCD sum rules
• Scalar-Meson - Baryon Coupling Constants in QCD Sum Rules
• Pertinent Dirac structure for QCD sum rules of meson-baryon coupling constants
• On the strong coupling $N^{(\ast )}{N}^{(\ast )}\pi$
• Strong transitions of decuplet to octet baryons and pseudoscalar mesons
• Pion--baryon coupling constants in light cone QCD sum rules
• A projected correlation function approach to the pi NN coupling constant in QCD sum rules
• Model-independent study of the QCD sum rule for the pi NN coupling constant
• Strong coupling constant of negative parity nucleon with $\pi$ meson in light cone QCD sum rules
• Comment on ``Determination of pion-baryon coupling constants from QCD sum rules''
• The F/D Ratio and Meson-Baryon Couplings from QCD Sum Rules
• Reply to Comment on ``Determination of pion-baryon coupling constants from QCD sum rules''
• Working Group Summary: Pion-Nucleon Coupling Constant