1998/09/30 by Hungchong Kim, Su Houng Lee, Makoto Oka · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1016/s0370-2693(99)00379-2
published as Phys.Lett. B453 (1999) 199-205 · 11 pages, revtex, substantial revision, the final version accepted for publication in Physics Letters B
arxiv created 1999/03/16 · openalex publication_date 1999/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In the conventional QCD sum rule calculation for the πNN coupling beyond the soft-pion limit, there are three distinct Dirac structures, each of which can be used to construct separate sum rule. We point out subtleties in the previous sum rule results, based on one of the Dirac structure, associated with using either the PV or the PS coupling schemes in modeling the phenomenological side. We propose a sum rule coming from a different Dirac structure, which is independent of the coupling schemes used and has less uncertainty in the OPE. The obtained value is gπN=9.76 ± 2.04 where the uncertainty mainly comes from the quark-gluon mixed condensate.