Effect of NN-correlations on predictions of nuclear transparencies for protons, knocked-out in high Q²(e,e'p) reactions

الأصل · EN

We study the transparency T of nuclei for nucleons knocked-out in high-energy semi-inclusive (e,e'p) reactions, using an improved theoretical input, discussed by Nikolaev et al. We establish that neglect of NN-correlations between the knocked-out and core nucleons reduces nuclear transparencies by ≈ 15 % for light, to ≈ 10% for heavy nuclei. About the same is predicted for transparencies, integrated over the transverse or longitudinal momentum of the outgoing proton. Hadron dynamics predicts a roughly constant T beyond Q²≈ 2 GeV², whereas for all targets the largest measured data point Q²=6.7 GeV² appears to lie above that plateau. Large error bars on those data-points preclude a conclusion regarding the onset of colour transparency.