scattering parameters and possible bound state from photoproduction on the deuteron

Ishikawa, Takatsugu*; Tsuchikawa, Yusuke ; FOREST Collaboration*; 48 of others*

Two physics programs, determination of low-energy scattering parameters between the eta meson () and nucleon (), and search for a possible bound state between the eta prime meson () and deuteron (), using photoproduction from the deuteron target are conducted at ELPH, Tohoku University. An experiment is carried out to determine the low-energy scattering parameters using a special kinematics. The measurement is currently in progress to determine the real part of the -neutron () scattering length. A possible bound state is theoretically predicted, and a structure corresponding to the state can be observed via the reaction at incident energies around 1.2 GeV. The angular differential cross sections are determined at backward emission angles. The tail of the corresponding peak is not observed, and the background level is much higher than predicted.