Forward coherent $φ$-meson photoproduction from deuterons near threshold

Details Forward coherent $φ$-meson photoproduction from deuterons near threshold Forward coherent $φ$-meson photoproduction from deuterons near threshold

2007-03-23

arxiv.org/abs/nucl-ex/0703034v2

Phys.Lett.B658:209-215,2008

Physics

Nuclear Physics

Nuclear Experiment

14 pages, 6 figures. Final published version

Scientific paper

10.1016/j.physletb.2007.11.009

Differential cross sections and decay asymmetries for coherent $\phi$-meson photoproduction from deuterons were measured for the first time at forward angles using linearly polarized photons at $E_{\gamma}$= 1.5-2.4 GeV. This reaction offers a unique way to directly access natural-parity Pomeron dynamics and gluon exchange at low energies. The cross sections at zero degrees increase with increasing photon energy. The decay asymmetries demonstrate a complete dominance of natural-parity exchange processes, showing that isovector unnatural-parity $\pi$-meson exchange is small. Nevertheless the deduced cross sections of $\phi$-mesons from nucleons contributed by isoscalar t-channel exchange processes are not well described by the conventional Pomeron model.

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