ωNN vertex function and the γπππ anomaly View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1997-12

AUTHORS

J. Speth, R. Tegen

ABSTRACT

We show that the empirical ωNN form factor (cut-off 1400–C1500 MeV) can be understood as arising from a combination of a quark model form factor (typical cut-off 700–C800 MeV) and an anomalous form factor ∼ q2 arising from the 3π-intermediate state. The anomaly contributes to the Dirac form factor F1(q2) with F1(0) = 0, (and sizable), and to the Pauli form factor F2(q2) with F2(0) ≠ 0. The resulting tensor coupling F2(0) is sensitive to the cut-off of the pion momenta in the two-loop integrals and turns out to be small for values around 1 GeV. The quark model ωNN tensor coupling F2(0) vanishes for point-like quarks. The anomaly, however, contributes a non-vanishing tensor coupling which can be seen to effectively enhance the vector coupling in NN models which do not include a tensor coupling. More... »

PAGES

717-726

References to SciGraph publications

  • 1983-10. The nucleon axial form factor and the pion-nucleon vertex function in ZEITSCHRIFT FÜR PHYSIK A HADRONS AND NUCLEI
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/s002880050518

    DOI

    http://dx.doi.org/10.1007/s002880050518

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