Magnetic Structure of Few-Nucleon Systems at High Momentum Transfers in a Chiral Effective Field Theory Approach
Physical Review C
The five low-energy constants (LECs) in the electromagnetic current derived in chiral effective field theory (χEFT) up to one loop are determined by a simultaneous fit to the A=2−3 nuclei magnetic moments and to the deuteron magnetic form factor and threshold electrodisintegration at backward angles over a wide range of momentum transfers. The resulting parametrization then yields predictions for the 3He/3H magnetic form factors in excellent accord with the experimental values for momentum transfers ranging up to ≈0.8 GeV/c, beyond the expected regime of validity of the χEFT approach. The calculations are based on last-generation two-nucleon interactions including high orders in the chiral expansion and derived by Entem, Machleidt, and Nosyk [Phys. Rev. C 96, 024004 (2017)] and by Piarulli et al. [Phys. Rev. C 94, 054007 (2016)], using different χEFT formulations. In the A=3 calculations, (chiral) three-nucleon interactions are also accounted for. The model dependence resulting from these different formulations of the interactions is found to be mild for momentum transfer below ≈0.8 GeV/c. An analysis of the convergence of the chiral expansion is also provided.
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Original Publication Citation
Gnech, A., & Schiavilla, R. (2022) Magnetic structure of few nucleon systems at high momentum transfers in a chiral effective field theory approach. Physical Review C, 106(4), 1-11, Article 044001. https://doi.org/10.1103/PhysRevC.106.044011
Gnech, A. and Schiavilla, R., "Magnetic Structure of Few-Nucleon Systems at High Momentum Transfers in a Chiral Effective Field Theory Approach" (2022). Physics Faculty Publications. 702.