Delta-excitations and the three-nucleon force

Details Delta-excitations and the three-nucleon force Delta-excitations and the three-nucleon force

2007-12-12

arxiv.org/abs/0712.1969v2

Nucl.Phys.A806:65-78,2008

Physics

Nuclear Physics

Nuclear Theory

12 pages, 2 figures; minor changes, reference added

Scientific paper

10.1016/j.nuclphysa.2008.02.305

We study the three-nucleon force in chiral effective field theory with explicit Delta-resonance degrees of freedom. We show that up to next-to-next-to-leading order, the only contribution to the isospin symmetric three-nucleon force involving the spin-3/2 degrees of freedom is given by the two-pion-exchange diagram with an intermediate delta, frequently called the Fujita-Miyazawa force. We also analyze the leading isospin-breaking corrections due to the delta. For that, we give the first analysis of the delta quartet mass splittings in chiral effective field theory. The charge-symmetry breaking three-nucleon force due to an intermediate delta excitation is small, of the order of a few keV.

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