The spectra of π− mesons originating from pC, HeC, CC, and CTa collisions are analyzed in terms of the light-front variables ξ and ζ. The angular and momentum distributions of π− mesons are studied in various regions of the variables ξ± and ζ±. These distributions in the regions \documentclass[12pt]{minimal}
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$$\xi ^ + < \tilde \xi ^ +$$
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$$\xi ^ + < \tilde \xi ^ +$$
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$$\xi ^ + < \tilde \xi ^ +$$
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$$\xi ^ + < \tilde \xi ^ +$$
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