Modification of parton fragmentation functions by multiple scattering and gluon bremsstrahlung in nuclear media is shown to describe very well the recent HERMES data in deeply inelastic scattering, giving the first evidence of the A2/3 dependence of the modification. The energy loss is found to be ⟨dE/dL⟩≈0.5 GeV/fm for a 10-GeV quark in an Au nucleus. Including the effect of expansion, analysis of the π⁰ spectra in central Au+Au collisions at √s=130 GeV yields an averaged energy loss equivalent to ⟨dE/dL⟩≈7.3 GeV/fm in a static medium. Predictions for central Au+Au collisions at √s=200 GeV are also given.
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Wang et al. (2002) studied this question.
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