Low-energy effective field theory of the deuteron

We study neutron-deuteron ($nd$) and proton-deuteron ($pd$) scatterings in two $S$-wave and five $P$-wave channels at low energies below the breakup momentum of the deuteron ($\Lambda_d\approx 45.7$ MeV) using the effective field theory developed in Ref. [1]. At this energy range, the deuteron can be considered a point-like particle, and Coulomb interaction in $pd$ scattering must be treated non-perturbatively. We will discuss the calculation of several low-energy observables for both systems and comparison to available experimental data.

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$[1]$ G. Rupak et al. “Fate of the neutron$-$deuteron virtual state as an Efimov level.” In: Phys. Lett. B791(2019), pp. 414–419.