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Unitary ambiguity of NN contact interactions and the 3N force

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arxiv 2007.04161 v2 pith:TAYKD56P submitted 2020-07-08 nucl-th

Unitary ambiguity of NN contact interactions and the 3N force

classification nucl-th
keywords contactinteractionschiralthree-nucleonaccountaddressalreadyambiguity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We identify a redundancy between two- and three-nucleon contact interactions at the fourth and fifth order of the chiral expansion respectively. In particular we show that tensor-type and spin-orbit three-nucleon contact interactions effectively account for that part of the two-nucleon interaction which depends on the total center-of-mass momentum and is unconstrained by relativity. This might give the chiral effective field theory enough flexibility to successfully address $A=3$ scattering observables already at N3LO.

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