6533b835fe1ef96bd129fd05

RESEARCH PRODUCT

Reggeized model forηandη′photoproduction

subject

description

A Reggeized model for $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ photoproduction on the nucleon is presented. In this model, $t$-channel vector meson exchanges are described in terms of Regge trajectories to comply with the correct high energy behavior. We compare this Reggeized model with an isobar model ($\ensuremath{\eta}$-MAID), where the $t$-channel exchanges are described by $\ensuremath{\rho}$ and $\ensuremath{\omega}$ poles. Both models contain the same resonance contributions, and describe current $\ensuremath{\gamma}p\ensuremath{\rightarrow}\ensuremath{\eta}p$ data up to ${E}_{\ensuremath{\gamma}}^{\text{lab}}=2\phantom{\rule{0.3em}{0ex}}\text{GeV}$ quite well, but only the Reggeized model can be successfully extended to higher energies. For the $\ensuremath{\gamma}p\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}p$ reaction, the Reggeized model is found to be able to give a satisfactory description. For the differential cross section data from SAPHIR, we find that the observed linear forward rise in $\mathrm{cos}\phantom{\rule{0.3em}{0ex}}\ensuremath{\theta}$ near ${E}_{\ensuremath{\gamma}}^{\text{lab}}=1.6\phantom{\rule{0.3em}{0ex}}\text{GeV}$ can be well described by the interference of an ${S}_{11}$ resonance and the Regge trajectory exchanges without any need for an additional $P$-wave resonance.