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HK: Hadronen und Kerne
HK 8: Nuclear Forces I, Few Nucleon Systems
HK 8.2: Talk
Monday, March 16, 1998, 14:30–14:45, F
Elastic np scattering and the π NN coupling constant, f2πNN. — •J. Franz, E. R"ossle, H. Schmitt, and L. Schmitt — Fakult"at f"ur Physik der Universit"at Freiburg
The value of the πNN coupling constant, f2πNN, has focussed
new interest recently in
connection with a discussion on a conceivable breaking of charge independence
[1-4]. One can extract in principle the
charged πnp coupling constant, fc2, by extrapolating the
measured backward elastic differential cross section to the pion pole in the
unphysical region. We applied the Chew method [5] to an extensive set of
medium energy data for np elastic scattering in the backward hemisphere.
The extracted fc2 values depend sensitive on the experimental
uncertainties and
on the angular range for the extrapolating fit.
Systematic tests of this method have been performed on pseudodata
showing the limited applicability of the extraction.
[1] T.E.O. Ericson, Nucl. Phys. A543, 409c (1992)
[2] R.A. Arndt, I.I. Strakovsky, and R.L. Workman, Phys. Rev. C52, 2246 (1995)
[3] R.A.M. Klomp et al., Phys. Rev. C44 R1258 (1991);
V. Stoks, R. Timmermans, and J.J. de Swart , Phys. Rev. C47 512 (1993)
[4] D.V. Bugg, and R. Machleidt, Phys. Rev. C52 1203 (1995)
[5] G.F Chew, Phys. Rev. 112 1380 (1958)