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arXiv · 2601.19033

Partial-wave decomposition of isospin-projected subleading three-nucleon contact interactions

Elena Filandri·Luca Girlanda·Ylenia Capitani
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Abstract

We analyze the subleading three-nucleon contact interaction terms at N4LO in chiral effective field theory. We perform the isospin projection into $T=1/2$ and $T=3/2$ states, and find that only eleven of the thirteen operators contribute in the $T=1/2$ channel. By projection on the partial waves of the asymptotic configuration of $N-d$ scattering states in momentum space, we find contributions from ten combinations of LECs. These results provide a useful basis for including N4LO three-body forces in few-body calculations and for constraining them through numerical fits to data.

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Elena Filandri, Luca Girlanda, Ylenia Capitani. 2026-01-26. Partial-wave decomposition of isospin-projected subleading three-nucleon contact interactions. https://arxiv.org/abs/2601.19033

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