# Evidence for the Onset of Color Transparency in $\rho^0$ Electroproduction off Nuclei

Abstract : 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.
Document type :
Journal articles

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Submitted on : Friday, June 22, 2012 - 9:10:06 AM
Last modification on : Monday, December 13, 2021 - 9:14:56 AM

### Citation

L. El Fassi, L. Zana, K. Hafidi, M. Holtrop, B. Mustapha, et al.. Evidence for the Onset of Color Transparency in $\rho^0$ Electroproduction off Nuclei. Physics Letters B, Elsevier, 2012, 712, pp.326-330. ⟨10.1016/j.physletb.2012.05.019⟩. ⟨in2p3-00710934⟩

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