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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.
Source :
Acta Physica Polonica B. Jan2020, Vol. 51 Issue 1, p27-32. 6p.
Publication Year :
2020

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
05874254
Volume :
51
Issue :
1
Database :
Academic Search Index
Journal :
Acta Physica Polonica B
Publication Type :
Academic Journal
Accession number :
140523265
Full Text :
https://doi.org/10.5506/APhysPolB.51.27