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With the use of pionless effective field theory including dibaryon fields, westudy the $\gamma d \to \vec{n} p$ reaction for the laboratory photon energy$E_\gamma^{lab}$ ranging from threshold to 30 MeV. Our main goal is tocalculate the neutron polarization $P_{y'}$ defined as $P_{y'} = (\sigma_+ -\sigma_-)/(\sigma_+ + \sigma_-)$, where $\sigma_+$ and $\sigma_-$ are thedifferential cross sections for the spin-up and spin-down neutrons,respectively, along the axis perpendicular to the reaction plane. We alsocalculate the total cross section as well as the differential cross section$\sigma(\theta)$, where $\theta$ is the colatitude angle. Although the resultsfor the total and differential cross sections are found to agree reasonablywell with the data, the results for $P_{y'}$ show significant discrepancy withthe experiment. We comment on this discrepancy.

Spin Polarization in $\gamma d \to \vec{n}p$ at Low Energies with a Pionless Effective Field Theory