We calculate the two-body triton photodisintegration cross section as a function of photon energy to next-to-next-to leading order (NNLO) in pionless effective field theory [EFT($\cancel{\pi }$)] and show good agreement with experiment. In addition we calculate the polarization asymmetry $R_C=-0.441\left(15\right)$ in cold neutron-deuteron capture to NNLO in EFT($\cancel{\pi }$), in agreement with the experimental value of $R_C=-0.42\pm 0.03$ [Konijnenberg et al., Phys. Lett. B 205, 215 (1988)]. We also assess the dependence of $R_C$ on different fits of the two-nucleon magnetic currents. Finally, we consider the impact of Wigner-SU(4) symmetry and demonstrate that starting from the Wigner-SU(4) symmetric limit and including perturbative corrections to the breaking of Wigner-SU(4) symmetry does a good job of describing two-body triton photodisintegration.

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• Few-body systems
• Photonuclear reactions
• Effective field theory