Evidence for the Onset of Color Transparency in ρ 0 Electroproduction o ff Nuclei

Evidence for the Onset of Color Transparency in ρ 0 Electroproduction o ff Nuclei
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ρ 0 原子核电产生出现颜色透明的证据

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通讯作者：
G. Dellepiane
G. Dellepiane
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作者：
M. Alloisio;A. Demartini;C. Cuniberti;G. Petrillo;S. Thea;E. Giorgetti;A. Giusti;G. Dellepiane

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用5GeV电子束测量了12C和56Fe靶中非相干衍射A（e，e ′ ρ 0）过程相对于2H的核透明性。研究了对ρ A相互作用敏感的核透明性，即核上产生的ρ 0相对于氘的比值，它是相干长度（lc）、虚光子强子涨落寿命和四动量转移平方（Q2）的函数.虽然12 C和56 Fe的透明度没有显示出l c依赖性，但测量到显著的Q 2依赖性，这与包括颜色透明度效应的计算一致。
We have measured the nuclear transparency of the incoherent di ff ractive A ( e , e ′ ρ 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 ρ 0 ’s on a nucleus relative to deuterium, which is sensitive to ρ 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 e ff ects.