The Weak Parity-Violating Pion-Nucleon Coupling (Revised)

Details The Weak Parity-Violating Pion-Nucleon Coupling (Revised) The Weak Parity-Violating Pion-Nucleon Coupling (Revised)

1995-11-02

arxiv.org/abs/nucl-th/9511002v1

Phys.Lett. B367 (1996) 21-27; Erratum-ibid. B440 (1998) 449

Physics

Nuclear Physics

Nuclear Theory

13 pages, uses LaTex; figures can be obtained from any of the authors: Henley@phys.washington.edu, Kisslinger@kelvin. phys.cmu

Scientific paper

10.1016/0370-2693(95)01403-9

We use QCD sum rules to obtain the weak parity-violating pion-nucleon coupling constant $f_{\pi NN}$. We find that $f_{\pi NN}\approx 2\times 10^{-8}$, 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 $^{18}$F parity-violating measurements.

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