On the cross section ratio sigma_n/sigma_p in eta photoproduction

Details On the cross section ratio sigma_n/sigma_p in eta photoproduction On the cross section ratio sigma_n/sigma_p in eta photoproduction

2009-09-18

arxiv.org/abs/0909.3538v2

Phys.Lett.B683:145-149,2010

Physics

Nuclear Physics

Nuclear Theory

Version accepted by Phys. Lett. B

Scientific paper

10.1016/j.physletb.2009.12.029

The recently discovered enhancement of eta photoproduction on the quasi-free neutron at energies around sqrt(s)~1.67 GeV is addressed within a SU(3) coupled channel model. The quasi-free cross sections on proton and neutron, sigma_n and sigma_p, can be quantitatively explained. In this study, the main source for the peak in sigma_n/sigma_p is a coupled channel effect in S-wave that explains the dip-bump structure in gamma n --> eta n. In particular, the photon coupling to the intermediate meson-baryon states is important. The stability of the result is extensively tested and consistency with several pion- and photon-induced reactions is ensured.

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