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

Abstract

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.

13 pages, uses LaTex; figures can be obtained from any of the authors: [email protected], Kisslinger@kelvin. phys.cmu.edu, [email protected]

References in corpus (2)

• Intermediate-Energy Semileptonic Probes of the Hadronic Neutral Current
• The Off Shell $\rho$-$\omega$ Mixing in the QCD Sum Rules

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• Progress in vacuum susceptibilities and their applications to the chiral phase transition of QCD
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• First Observation of $P$-odd $\gamma$ Asymmetry in Polarized Neutron Capture on Hydrogen
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• Structure of Vacuum Condensates
• Consistency of parity-violating pion-nucleon couplings extracted from measurements in 18F and 133Cs
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• Parity Violation in gamma proton Compton Scattering
• The Anapole Form Factor of the Deuteron
• Measuring the P-odd Pion-Nucleon Coupling h_{πNN}^{(1)} in π^+ Photoproton Production Near the Threshold
• Parity Violation in Polarized-Gamma Proton Compton Scattering
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• The nucleon-sigma coupling constant in QCD Sum Rules
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• Revisiting the Vector and Axial-vector Vacuum Susceptibilities
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• Vector, Axial, Tensor and Pseudoscalar Vacuum Susceptibilities
• Calculation of some properties of the vacuum
• Sigma Signal for Hybrid Baryon Decay
• Progress toward a new measurement of the parity violating asymmetry in n+p-->d+gamma
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• Strangeness-Conserving Hadronic Parity Violation at Low Energies
• Sigma and Pion Decays of Mixed Heavy Hybrids