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- Title
ηN SCATTERING PARAMETERS AND POSSIBLE η'd BOUND STATE FROM η PHOTOPRODUCTION ON THE DEUTERON.
- Authors
ISHIKAWA, T.; AOKI, K.; FUJIMURA, H.; FUKASAWA, H.; FUJIOKA, H.; HASHIMOTO, R.; HE, Q.; HONDA, Y.; HOTTA, T.; INOUE, Y.; ITAHASHI, K.; IWATA, T.; KAIDA, S.; KANDA, H.; KASAGI, J.; KAWANO, A.; KUSAWAKI, S.; KAWAI, H.; MAEDA, K.; MASUMOTO, S.
- Abstract
Two physics programs, determination of low-energy scattering parameters between the eta meson (η) and nucleon (N), and search for a possible bound state between the eta prime meson (η') and deuteron, using η photo-production from the deuteron target are conducted at the Research Center for Electron Photon Science (ELPH), Tohoku University. Among the twobody dynamics of the meson-nucleon systems, the ηN interaction is not well-known although it has been found attractive. An experiment is carried out to determine the low-energy ηN scattering parameters using a special kinematics. The energy and momentum of the emitted proton (p) are measured at 0 degrees for η photoproduction on the deuteron (d) at incident energies around 0.94 GeV, which gives the low relative momentum between η and neutron (n) in the final state. Low-energy ηn scattering is likely to take place in this condition, and the scattering parameters can be determined from the differential cross section as a function of the ηn invariant mass. The measurement is currently in progress to determine the real part of the ηn scattering length. A possible η'd bound state is theoretically predicted, and a structure corresponding to the state can be observed via the γd → ηd reaction at incident energies around 1.2 GeV. In the case of backward η emission, the structure becomes prominent because a background contribution coming from quasi-free single-step η emission is highly suppressed. The γd → ηd reaction has been also studied at ELPH below the incident energy of 1.15 GeV. The angular differential cross sections are determined at backward η emission angles. The tail of the corresponding peak is not observed, and the background level is much higher than predicted.
- Subjects
TOHOKU University; DEUTERONS; DIFFERENTIAL cross sections; BOUND states; MESONS; NUCLEON-nucleon interactions; PARTICLES (Nuclear physics)
- Publication
Acta Physica Polonica B, 2020, Vol 51, Issue 1, p27
- ISSN
0587-4254
- Publication type
Article
- DOI
10.5506/APhysPolB.51.27