Evidence for the Onset of Color Transparency in $ρ^0$ Electroproduction off Nuclei

Details Evidence for the Onset of Color Transparency in $ρ^0$ Electroproduction off Nuclei Evidence for the Onset of Color Transparency in $ρ^0$ Electroproduction off Nuclei

2012-01-13

arxiv.org/abs/1201.2735v3

Physics

Nuclear Physics

Nuclear Experiment

6 pages and 4 figures

Scientific paper

We have measured the nuclear transparency of the incoherent diffractive $A(e,e'\rho^0)$ process in $^{12}$C and $^{56}$Fe targets relative to $^2$H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced $\rho^0$'s on a nucleus relative to deuterium, which is sensitive to $\rho A$ interaction, was studied as function of the coherence length ($l_c$), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared ($Q^2$). While the transparency for both $^{12}$C and $^{56}$Fe showed no $l_c$ dependence, a significant $Q^2$ dependence was measured, which is consistent with calculations that included the color transparency effects.

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