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On the pion-exchange contributions to the parity-violating internucleon potential

Authors
Journal
Nuclear Physics B
0550-3213
Publisher
Elsevier
Publication Date
Volume
40
Identifiers
DOI: 10.1016/0550-3213(72)90556-1

Abstract

Abstract Arguments are given that the factorization approximation should give the right order of magnitude if applied to the strangeness non-changing weak meson-nucleon vertex. This means that the currently used strength of the ϱ-exchange potential V ϱ is approximately correct, while the one-pion exchange contribution V π has likely been overestimated. In our model, which treats both the weak ϱ- and π-coupling on the same footing, V π becomes proportional to the neutron-proton mass difference and is therefore zero if no isospin-breaking is taken into account. We further show that (2 π)-contributions are likewise zero even in case that one of the internal nucleon lines is a higher nucleon resonance, and that in lowest order the weak γ-emission becomes zero too.

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