Four-body Faddeev-Yakubovsky calculation of polarization transfer   coefficient $\bm{K}_y^{y'}$ in the $^2$H$(\vec{\bm{d}}, \vec{\bm{p}})^3$H   reaction at very low energies
  The polarization transfer coefficient $K_y^{y'}$ for the $^2$H$(\vec{d}, \vec{p})^3$H reaction at energies $E_{\rm lab.} = 30$, 50, 70, and 90keV is calculated using the four-body Faddeev-Yakubovsky equation. We employ a separable type of the Paris potential. The experimental data [Phys. Rev. {\bf C64}, 047601 (2001)] agrees with our solution at the scattering angle $\theta_{\rm c.m.}=0^\circ$, and there is no discrepancy pointed out in that paper. We found that the $K_y^{y'}$ is sensitive to the incident deuteron energy at this angle. 
Eizo Uzu