Two-pion exchange nucleon-nucleon potential model independent features |
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| Affiliation: | 1. Department of Health, Animal Science and Food Safety, University of Milan, via G. Celoria 10, 20133 Milan, Italy;2. Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC 3010, Australia;3. Animal Production Science, Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, Bundoora, VIC 3083, Australia;4. NSW Department of Primary Industries, Centre for Red Meat and Sheep Development, PO Box 129, Cowra, NSW 2794, Australia |
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| Abstract: | A chiral pion-nucleon amplitude supplemented by the HJS subthreshold coefficients is used to calculate the the long range part of the two-pion exchange nucleon-nucleon potential. In our expressions the HJS coefficients factor out, allowing a clear identification of the origin of the various contributions. A discussion of the configuration space behaviour of the loop integrals that determine the potential is presented, with emphasis on cancellations associated with chiral symmetry. The profile function for the scalar-isoscalar component of the potential is produced and shown to disagree with those of several semi-phenomenological potentials. |
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