Towards a field theoretic understanding of NN->NNpi

Details Towards a field theoretic understanding of NN->NNpi Towards a field theoretic understanding of NN->NNpi

2005-11-21

arxiv.org/abs/nucl-th/0511054v1

Eur.Phys.J.A27:37-45,2006

Physics

Nuclear Physics

Nuclear Theory

15 Pages, 5 Figures

Scientific paper

10.1140/epja/i2006-10002-4

We study the production amplitude for the reaction NN->NNpi up to next--to--leading order in chiral perturbation theory using a counting scheme that takes into account the large scale introduced by the initial momentum. In particular we investigate a subtlety that arises once the leading loop contributions are convoluted with the NN wavefunctions as demanded by the non--perturbative nature of the NN interaction. We show how to properly identify the irreducible contribution of loop diagrams in such type of reaction. The net effect of the inclusion of all next-to-leading order loops is to enhance the leading rescattering amplitude by a factor of 4/3, bringing its contribution to the cross section for pp->dpi+ close to the experimental value.

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