Effective Theory of the Triton

P.F. Bedaque (INT) , H.-W. Hammer (TRIUMF) , U. van Kolck (Caltech & U. of Washington)

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classification ⚛️ nucl-th

keywords effectiverenormalizationsystemtheorythree-nucleontritonapplyapproach

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We apply the effective field theory approach to the three-nucleon system. In particular, we consider S=1/2 neutron-deuteron scattering and the triton. We show that in this channel a unique nonperturbative renormalization takes place which requires the introduction of a single three-body force at leading order. With one fitted parameter we find a good description of low-energy data. Invariance under the renormalization group explains some universal features of the three-nucleon system ---such as the Thomas and Efimov effects and the Phillips line--- and the origin of SU(4) symmetry in nuclei.

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Coulomb Effects and Wigner-SU(4) Symmetry in He-3 Charge and Magnetic Properties
nucl-th 2026-04 unverdicted novelty 4.0

Non-perturbative Coulomb corrections in LO pionless EFT give a 0.85(3) MeV He-3/H-3 binding split, 0.043(2) fm charge-radius shift, 0.036(2) fm magnetic-radius shift, and -0.0041(1) μ_N moment shift.