Abstract
Using backward $\ensuremath{\pi}N$ dispersion relations (BDR) and sum rules derived from BDR we obtain the spin-flip ${f}^{0}\mathrm{NN}$ and a combination of the flip and nonflip $\mathrm{gNN}$ coupling constants, and fit certain backward $\ensuremath{\pi}N$ data. Our results have implications in the one-boson-exchange theory of the nucleon-nucleon force and in theories of elementary particles which assume universal coupling to the stress tensor.
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