Particle production in the central rapidity region of ultrarelativistic nuclear collisions

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Abstract
We discuss the central rapidity region of high-energy proton-nucleus collisions in the context of a flux-tube model. This model supposes the creation of a color flux tube by a random-walk color-charging process and its subsequent decay by qq¯ and gluon-pair creation. The observed dependence of particle multiplicity on the number ν of projectile interactions is explained. Some further implications of the model for high-energy proton-nucleus and nucleus-nucleus collisions, including A dependence in the latter case, are discussed.