Scaling Distributions of Quarks, Mesons and Proton for all $p_T$, Energy and Centrality

Abstract

We present the evidences for the existence of a universal scaling behavior of the production of ${\pi }^0$ at all transverse momenta in heavy-ion collisions at all centralities and all collision energies. The corresponding scaling behavior of the quarks is then derived just before the quarks recombine with antiquarks to form the pions. The degradation effect of the dense medium on the quark $p_T$ is derived from the scaling distribution. In the recombination model it is then possible to calculate the $p_T$ distributions of the produced proton and kaon, which are scaling also. Experimentally verifiable predictions are made. Implications of the existence of the scaling behavior are discussed.

arXiv comment10 pages in RevTeX, including 14 figures in eps files

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