About QCD sum rules for pion-nucleon coupling

Details About QCD sum rules for pion-nucleon coupling About QCD sum rules for pion-nucleon coupling

1999-01-13

arxiv.org/abs/nucl-th/9901029v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, sprocl.sty, Talk presented at 1998 YITP-workshop on QCD and Hadron Physics (Oct. 14 -18, 1998, Kyoto, Japan)

Scientific paper

We point out subtleties in the previous sum rule calculations of the $\pi NN$ coupling associated with using either the PV or the PS coupling schemes in modeling the phenomenological side. We propose a sum rule which is independent of the coupling schemes used and has less uncertainty in the OPE. The obtained value is $g_{\pi N}=9.76 \pm 2.04$ where the uncertainty mainly comes from the quark-gluon mixed condensate.

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