1998/09/11 by Shi-Lin Zhu, W-Y. P. Hwang, W. -Y. P. Hwang +1 · 3 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1103/physrevc.59.442
published as Phys.Rev.C59:442-450,1999 · Submitted to Phys. Rev. C
arxiv created 1998/09/11 · openalex publication_date 1999/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the two point correlation function of two nucleon currents sandwiched between the vacuum and the pion state. The light cone QCD sum rules are derived for the \ensuremathπNN coupling g_\ensuremathπNN and the \ensuremathπNN(1535) coupling g_\ensuremathπNN*. The contribution from the excited states and the continuum is subtracted cleanly through the double Borel transform with respect to the two external momenta p12, p22=(p\ensuremath-q)2. We first improve the original sum rule for g_\ensuremathπNN and determine the value of the pion wave function \ensuremathφ_\ensuremathπ(u0=(1)/(2))=1.5\ifmmode±\else\textpm\fi0.2, which is a fundamental nonperturbative quantity similar to the quark condensate. Our calculation shows that the \ensuremathπNN(1535) coupling is strongly suppressed.