Abstract
We point out that analysis of a particular structure function for massive muon-pair production in proton-proton collisions may be capable of signaling the diffractive corrections which are expected, in the parton model, to be present in addition to the "bare" Drell-Yan term. A similar analysis of single-particle semi-inclusive electroproduction in the massive quark model suggests that the azimuthal angle dependence should be suppressed at most by logarithms of ${q}^{2}$, at variance with the behavior expected in the parton model. This investigation reveals the importance of a particular assumption which is necessary in the derivation of the parton-model result.
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