Speaker
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In this work [1], we present an extensive theoretical and numerical study of charged few-nucleon systems ($pd$, $dd$, and $p-{}^3\text{He}$ bound states and scattering) in the framework of pionless effective field theory (EFT) up to next-to-leading order (NLO).
We treat the Coulomb interaction nonperturbatively, while NLO interactions, including three-body forces and a four-body force, are treated in perturbation theory. Scattering phase shifts are extracted using recently developed harmonic oscillator trap method for charged projectile and target [2]. Special attention is given to renormalization issues. Only a mild cutoff dependence is seen, consistent with the expectations of power counting in pionless EFT.
The results hold significant promise for 𝑎𝑏-𝑖𝑛𝑖𝑡𝑖𝑜 studies of charged-particle scattering at very low energies, with applications to reactions of astrophysical interest.
[1] M. Rojik, M. Schäfer, M. Bagnarol, and N. Barnea, Phys. Rev. C 113, 024001, 2026.
[2] M. Bagnarol, N. Barnea, M. Rojik, M. Schäfer, Phys. Lett. B 861, 139230, 2025.
| Theoretical or experimental | Theoretical |
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