Scale invariance is tested in ratios of muon scattering cross sections from an iron target at pairs of q² values ranging to 40 (GeV/c)² and differing by a factor of 3/8. The apparatus was changed with incident energy to preserve acceptance and resolution in scaled variables. The scale-noninvariant departure from unity of these ratios displays a statistically significant ω dependence. The effect exceeds the systematic uncertainty by a factor of 1.7.
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Watanabe et al. (1975) studied this question.
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