Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-07-18
Phys.Lett. B424 (1998) 8-14
Physics
Nuclear Physics
Nuclear Theory
12 pp, LaTeX file, 4 figures (uses epsf), enlarged version, accepted for publication in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(98)00216-0
We examine the role of the elementary isoscalar pion--nucleon scattering amplitude in the description of the processes $pp \to pp\pi^0$ and $pp\to d\pi^+$ at threshold. We argue that the presently used tree level dimension two approximation used in chiral perturbation theory is insufficient as input by direct comparison with the $\pi$N scattering data. We also show that a successful semi--phenomenological boson--exchange model does better in the description of these data. The influence of the violation of crossing symmetry in the meson--exchange model has to be studied in more detail. We stress that further investigations of the process $pp\to d\pi^+$ can pave the way to a deeper understanding of the pion dominated part of the transition operator.
Haidenbauer Johann
Hanhart Ch.
Hoffmann Marc
Meißner Ulf-G.
Speth Josef
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