Determination of pion-baryon coupling constants from QCD sum rules

Preprint

22 August 1996

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/9606471

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.

Keywords

COUPLING CONSTANTS
INTERPOLATING
SIGMA SIGMA
UNCERTAINTY
SUM RULES
PI SIGMA
QCD SUM
BARYON
PION

All Related Versions

Version 1, 1996-06-28, ArXiv
Version 2, 1996-08-22, ArXiv
Version 1, 1995-12-08, ArXiv (Unconfirmed version)
Version 2, 1996-01-30, ArXiv (Unconfirmed version)
Published version: Physical Review C, 54 (6), 3240.

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