1995/11/02 by Ernest M. Henley, E. M. Henley, W-Y. P. Hwang +2 · 54 citations
Mathematics · Physics and Astronomy · #Coupling (piping) #Coupling constant #High-Energy Particle Collisions Research #Limit (mathematics) #Mathematics #Nucleon #Parity (physics) #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Sum rule in quantum mechanics #nucl-th
paper · pdf · doi:10.1016/0370-2693(95)01403-9
published in Physics Letters B 367(1-4), 21-27 (Elsevier BV) · 13 pages, uses LaTex; figures can be obtained from any of the authors: [email protected], Kisslinger@kelvin. phys.cmu.edu, [email protected]
arxiv created 1995/11/02 · openalex publication_date 1996/01/01 · arxiv updated 2014/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We use QCD sum rules to obtain the weak parity-violating pion-nucleon coupling constant fπNN. We find that fπNN≈ 2× 10-8, about an order of magnitude smaller than the ``best estimates'' based on quark models. This result follows from the cancellation between perturbative and nonperturbative QCD processes not found in quark models, but explicit in the QCD sum rule method. Our result is consistent with the experimental upper limit found from 18F parity-violating measurements.