Cutoff regulators in chiral nuclear effective field theory

Abstract

Three-dimensional cutoff regulators are frequently employed in multi-nucleon calculations, but they violate chiral symmetry and Lorentz invariance. A cutoff regularization scheme is proposed to compensate systematically at subleading orders for these symmetry violations caused by regulator artifacts. This is especially helpful when a soft momentum cutoff has to be used for technical reasons. It is also shown that dimensional regularization can still be used for some Feynman (sub)diagrams while cutoff regulators are used for the rest.

arXiv comment11 pages, published version

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• Two-nucleon scattering in a modified Weinberg approach with a symmetry-preserving regularization
• General aspects of effective field theories and few-body applications
• Study of the hidden charm $D{\bar{D}}^{\ast }$ interactions in chiral effective field theory
• High-precision nuclear forces from chiral EFT: State-of-the-art, challenges and outlook