Effects of nucleon resonances on η photoproduction off the neutron reexamined

Suh, Jung-Min (Department of Physics, Inha University, Incheon 22212, Republic of Korea) ; Kim, Sang-Ho (Center for Extreme Nuclear Matters (CENuM), Korea University, Seoul 02841, Republic of Korea) (Department of Physics, Pukyong National University (PKNU), Busan 48513, Republic of Korea) ; Kim, Hyun-Chul (Department of Physics, Inha University, Incheon 22212, Republic of Korea) (Advanced Science Research Center, Japan Atomic Energy Agency, Shirakata, Tokai, Ibaraki 319-1195, Japan) (School of Physics, Korea Institute for Advanced Study (KIAS), Seoul 02455, Republic of Korea)

12 April 2019

Abstract: We investigate η photoproduction off the neutron target, i.e., γnηn, employing an effective Lagrangian method combining with a Regge approach. As a background, we consider nucleon exchange in the s-channel diagram and ρ- and ω-meson Regge trajectories in the t channel. The role of nucleon resonances given in the Review of Particle Data Group in the range of W15002100 MeV and the narrow nucleon resonance N(1685,1/2+) is extensively studied. The numerical results of the total and differential cross sections, double polarization observable E, helicity-dependent cross sections σ1/2, σ3/2, and the Legendre coefficients of the angular distributions for σ1/2, σ3/2 are found to be in qualitative agreement with the recent A2 experimental data. The predictions of the beam asymmetry are also given.


Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.074010
arXiv: 1810.05056
License: CC-BY-4.0



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