BWhat changed
Clasie and collaborators measured pion electroproduction on deuterium, carbon, aluminium, copper and gold targets over momentum transfers squared of approximately 1.1–4.7 (GeV/c)². Their extracted nuclear transparency and its target-mass dependence varied with momentum transfer, in better agreement with the specific calculations incorporating color transparency than with the displayed conventional calculations.
Scientific scope
Clasie and collaborators measured pion electroproduction on deuterium, carbon, aluminium, copper and gold targets over momentum transfers squared of approximately 1.1–4.7 (GeV/c)². Their extracted nuclear transparency and its target-mass dependence varied with momentum transfer, in better agreement with the specific calculations incorporating color transparency than with the displayed conventional calculations. Transparency is a model-dependent super-ratio involving a simulated reference without pion–nucleon final-state interactions, not a direct image of a small pion. Observations support the stated model comparison, not a unique proof of color transparency or QCD factorization. Model and point-to-point uncertainties are separate, the compared models share parameters, and the authors called for higher-momentum data. The individual contributor list shown here is incomplete. Figure 2 labels aluminium as 29Al while the text identifies 27Al; preserve the original discrepancy pending verification.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. Transparency is a model-dependent super-ratio involving a simulated reference without pion–nucleon final-state interactions, not a direct image of a small pion. Observations support the stated model comparison, not a unique proof of color transparency or QCD factorization. Model and point-to-point uncertainties are separate, the compared models share parameters, and the authors called for higher-momentum data. The individual contributor list shown here is incomplete. Figure 2 labels aluminium as 29Al while the text identifies 27Al; preserve the original discrepancy pending verification.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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