Centrality Scaling of the $p_T$ Distribution of Pions

Details Centrality Scaling of the $p_T$ Distribution of Pions Centrality Scaling of the $p_T$ Distribution of Pions

2003-01-02

arxiv.org/abs/nucl-th/0301004v2

Phys.Rev.Lett. 90 (2003) 212301

Physics

Nuclear Physics

Nuclear Theory

4 pages RevTex, 5 figures included

Scientific paper

10.1103/PhysRevLett.90.212301

From the preliminary data of PHENIX on the centrality dependence of the $\pi^0$ spectrum in $p_T$ at midrapidity in heavy-ion collisions, we show that a scaling behavior exists that is independent of the centrality. It is then shown that $$ degrades with increasing $N_{\rm part}$ exponentially with a decay constant that can be quantified. A scaling distribution in terms of an intuitive scaling variable is derived that is analogous to the KNO scaling. No theoretical models are used in any part of this phenomenological analysis.

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