About QCD sum rules for pion-nucleon coupling
Abstract
Description
We point out subtleties in the previous sum rule calculations of the $πNN$ 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 $g_{πN}=9.76 \pm 2.04$ where the uncertainty mainly comes from the quark-gluon mixed condensate.
4 pages, sprocl.sty, Talk presented at 1998 YITP-workshop on QCD and Hadron Physics (Oct. 14 -18, 1998, Kyoto, Japan)
4 pages, sprocl.sty, Talk presented at 1998 YITP-workshop on QCD and Hadron Physics (Oct. 14 -18, 1998, Kyoto, Japan)