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11 November 2024
 
  » arxiv » nucl-th/9605041

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Two-pion exchange potential and the $pi N$ amplitude
M. T. Pe~na ; Franz Gross ; Yohanes Surya ;
Date 30 May 1996
Journal Phys.Rev. C54 (1996) 2235-2239
Subject nucl-th
AffiliationCFNUL and IST, Lisbon), Franz Gross and Yohanes Surya (William & Mary and CEBAF
AbstractWe discuss the two-pion exchange potential which emerges from a box diagram with one nucleon (the spectator) restricted to its mass shell, and the other nucleon line replaced by a subtracted, covariant $pi N$ scattering amplitude which includes $Delta$, Roper, and $D_{13}$ isobars, as well as contact terms and off-shell (non-pole) dressed nucleon terms. The $pi N$ amplitude satisfies chiral symmetry constraints and fits $pi N$ data below $sim$ 700 MeV pion energy. We find that this TPE potential can be well approximated by the exchange of an effective sigma and delta meson, with parameters close to the ones used in one-boson-exchange models that fit $NN$ data below the pion production threshold.
Source arXiv, nucl-th/9605041
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