The Pion-Nucleon Form Factor From QCD Sum Rules

Details The Pion-Nucleon Form Factor From QCD Sum Rules The Pion-Nucleon Form Factor From QCD Sum Rules

1995-06-29

arxiv.org/abs/nucl-th/9506030v1

Phys.Rev.C52:3386-3392,1995

Physics

Nuclear Physics

Nuclear Theory

13 pages (REVTEX), 6 figures as 5 postscript files (as fig.uu tarred, compressed, uudecoded)

Scientific paper

10.1103/PhysRevC.52.3386

QCD sum rules are used to calculate the $q^2$ dependence of the $\pi NN$ coupling $g_{\pi NN} (q^2)$ in the spacelike region $0.5 \ {\mbox{GeV}}^2 \lesssim q^2 \lesssim 1.5\ {\mbox{GeV}}^2$. We study the Borel sum rule for the three point function of one pseudoscalar and two nucleon currents up to order four in the operator product expansion. The Borel transform is performed with respect to the nucleon momenta, whereas the momentum $q^2$ of the pseudoscalar vertex is kept fixed at spacelike values. The results can be well fitted using a monopole form with a cutoff mass of about $\Lambda_\pi \approx 800 \ {\mbox{MeV}}.

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