Renormalization of chiral two-pion exchange NN interactions with Delta-excitations: Central Phases and the Deuteron

Details Renormalization of chiral two-pion exchange NN interactions with Delta-excitations: Central Phases and the Deuteron Renormalization of chiral two-pion exchange NN interactions with Delta-excitations: Central Phases and the Deuteron

2008-09-18

arxiv.org/abs/0809.3186v3

Phys.Rev.C79:044001,2009

Physics

Nuclear Physics

Nuclear Theory

19 pages, 9 figures

Scientific paper

10.1103/PhysRevC.79.044001

The renormalization of the chiral np interaction with Delta-excitations in intermediate states is considered at next-to-leading order (NLO) and next-to-next-to-leading order (N2LO) for central waves. The inclusion of the Delta-excitation as an explicit degree of freedom improves the convergence properties of the effective field theory results for np scattering with respect to Delta-less theory, and allows the existence of a deuteron bound state in the infinite cut-off limit. The 1S_0 singlet and 3S_1 triplet phase shifts reproduce data for p ~ m_pi. The role of spectral function regularization is also discussed.

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