Determination of the pion-nucleon coupling constant from QCD sum rules

1995/12/31 by Michael C. Birse, Boris Krippa · 4 citations
Physics and Astronomy · #Coupling constant #Dimension (graph theory) #Dirac (video compression format) #Neutrino Physics Research #Nucleon #Particle physics theoretical and experimental studies #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Sum rule in quantum mechanics #hep-ph

paper · pdf · doi:10.1016/0370-2693(96)00133-5

published as Phys.Lett. B373 (1996) 9-15 · 14 pages (RevTeX), 1 figure (attached); revised version to appear in Physics Letters B: stronger comments on gamma_5 sum rule, numerical checks added

arxiv created 1996/01/30 · openalex publication_date 1996/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We evaluate the πN coupling constant using a QCD sum rule based on the pion-to-vacuum matrix element of the correlator of two interpolating nucleon fields. The part of the correlator with Dirac structure k\llap/γ₅ is used, keeping all terms up to dimension 5 in the OPE and including continuum contributions on the phenomenological side. The ratio of this sum rule to the nucleon sum rule involving condensates of odd dimension yields stable results with values of g_πN in the range 12± 5. The sources of uncertainty are discussed.

Cited by

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