phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV

Details phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV

2004-11-09

arxiv.org/abs/nucl-ex/0411016v1

Phys.Lett. B608 (2005) 215-222

Physics

Nuclear Physics

Nuclear Experiment

12 pages 4 figures, submitted to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.01.023

The photo-production of $\phi$ mesons from Li, C, Al, and Cu at forward angles has been measured at $E_gamma$=1.5--2.4 GeV. The number of events for incoherent phi photo-production is found to have a target mass number dependence of $A^{0.72\pm 0.07}$ in the kinematical region of $|t|\le 0.6$ ${\rm GeV}^2/c^2$. The total cross section of the $\phi$-nucleon interaction, $\sigma_{\phi N}$, has been estimated as $35^{+17}_{-11}$ mb using the $A$-dependence of the $\phi$ photo-production yield and a Glauber-type multiple scattering theory. This value is much larger than $\sigma_{\phi N}$ in free space, suggesting that the $\phi$ properties might change in the nuclear medium.

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