Fractional Energy Loss and Centrality Scaling

Details Fractional Energy Loss and Centrality Scaling Fractional Energy Loss and Centrality Scaling

2003-07-29

arxiv.org/abs/nucl-th/0307112v1

Phys.Rev. C69 (2004) 034902

Physics

Nuclear Physics

Nuclear Theory

4 pages in RevTeX

Scientific paper

10.1103/PhysRevC.69.034902

The phenomenon of centrality scaling in the high-\pt spectra of $\pi^0$ produced in Au-Au collisions at $\sqrt s=200$ GeV is examined in the framework of relating fractional energy loss to fractional centrality increase. A new scaling behavior is found where the scaling variable is given a power-law dependence on $N_{\rm part}$. The exponent $\gamma$ specifies the fractional proportionality relationship between energy loss and centrality, and is a phenomenologically determined number that characterizes the nuclear suppression effect. The implication on the parton energy loss in the context of recombination is discussed.

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