$η'$ photoproduction on the nucleons in the quark model

Details $η'$ photoproduction on the nucleons in the quark model $η'$ photoproduction on the nucleons in the quark model

2011-10-25

arxiv.org/abs/1110.5466v2

PHYS. REV. C84: 065204 (2011)

Physics

Nuclear Physics

Nuclear Theory

10 pages, 9 figures

Scientific paper

10.1103/PhysRevC.84.065204

A chiral quark-model approach is adopted to study the $\gamma p\rightarrow \eta'p$ and $\gamma n\rightarrow \eta' n$. Good descriptions of the recent observations from CLAS and CBELSA/TAPS are obtained. Both of the processes are governed by $S_{11}(1535)$ and $u$ channel background. Strong evidence of an $n=3$ shell resonance $D_{15}(2080)$ is found in the reactions, which accounts for the bump-like structure around $W=2.1$ GeV observed in the total cross section and excitation functions at very forward angles. The $S_{11}(1920)$ seems to be needed in the reactions, with which the total cross section near threshold for the $\gamma p\rightarrow \eta' p$ is improved slightly. The polarized beam asymmetries show some sensitivities to $D_{13}(1520)$, although its effects on the differential cross sections and total cross sections are negligible. There is no obvious evidence of the $P$-, $D_{13}$-, $F$- and $G$-wave resonances with a mass around 2.0 GeV in the reactions.

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