We have measured the nucleon-number (A) dependence of hadron-pair production in 400-GeV/c proton-nucleus collisions, using Pb and Be targets. Charged-hadron pairs were observed near rapidity yc.m.=-0.4 with Δφ180^∘. The A-dependence exponent rises from 1.1 to 1.2 in the range 2.0<~|p_⊥₁|+|p_⊥₂|<~4.5 GeV/c. The dihadron p_⊥ correlation function is significantly smaller for Pb than for Be.
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Finley et al. (1979) studied this question.
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