Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2010-06-22
Phys.Rev.C82:015205,2010
Physics
Nuclear Physics
Nuclear Experiment
25 pages, 14 figures
Scientific paper
10.1103/PhysRevC.82.015205
The LEPS/SPring-8 experiment made a comprehensive measurement of the spin-density matrix elements for $\gamma p \to \phi p$, $\gamma d \to \phi p n$ and $\gamma d \to \phi d$ at forward production angles. A linearly polarized photon beam at $E_{\gamma}$=1.6-2.4 GeV was used for the production of $\phi$ mesons. The natural-parity Pomeron exchange processes remains dominant nearthreshold. The unnatural-parity processes of pseudoscalar exchange is visible in the production from nucleons but is greatly reduced in the coherent production from deuterons. There is no strong $E_{\gamma}$-dependence, but some dependence on momentum-transfer. A small but finite value of the spin-density matrix elements reflecting helicity-nonconserving amplitudes in the $t$-channel is observed.
Ahn D. S.
Ahn Kook Jin
Akimune Hidetoshi
Asano Yasuhiro
Chang Wei Chun
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