$η^\prime$ photoproduction near threshold

Details $η^\prime$ photoproduction near threshold $η^\prime$ photoproduction near threshold

2000-11-19

arxiv.org/abs/nucl-th/0011070v1

Physics

Nuclear Physics

Nuclear Theory

Revtex, 3 eps figures, 1 table; Resubmitted to Phys. Rev. C

Scientific paper

10.1103/PhysRevC.63.035205

In this work, the $\eta^\prime$ meson photoproduction near threshold is studied in the quark model framework. A pseudovector effective Lagrangian is introduced for the $\eta^\prime NN$ coupling and the newly published data from the SAPHIR Collaboration provide good constraints to this parameter. Corrections of order $O(1/m_q^2)$ for the electromagnetic interaction vertex are taken into account, which produce corrections of order $O(1/m_q^3)$ to the transition amplitude for $\gamma p\to \eta^\prime p$. Some low-lying resonances, $S_{11}(1535)$, $P_{13}(1720)$, and $P_{13}(1900)$ are found to have significant contributions. A bump structure around $E_\gamma\approx$ 2 GeV is found arising from the $n=3$ terms in the harmonic oscillator basis. The beam polarization asymmetries are predicted and can be tested against the forthcoming data from GRAAL.

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