Scaling behavior of $(N_{ch})^{-1}dN_{ch}/dη$ at $\sqrt{s_{NN}} = 130$ GeV by PHOBOS Collaboration and its analyses in terms of stochastic approach

Details Scaling behavior of $(N_{ch})^{-1}dN_{ch}/dη$ at $\sqrt{s_{NN}} = 130$ GeV by PHOBOS Collaboration and its analyses in terms of stochastic approach Scaling behavior of $(N_{ch})^{-1}dN_{ch}/dη$ at $\sqrt{s_{NN}} = 130$ GeV by PHOBOS Collaboration and its analyses in terms of stochastic approach

2001-10-24

arxiv.org/abs/hep-ph/0110305v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 5 figures

Scientific paper

Recently interesting data on $dN_{ch}/d\eta$ in Au-Au collisions ($\eta=-\ln \tan (\theta/2)$) with the centrality cuts have been reported by PHOBOS Collaboration. Their data are usually divided by the number of participants (nucleons) in collisions. Instead of this way, using the total multiplicity $N_{ch} = \int (dN_{ch}/d\eta)d\eta$, we find that there is scaling phenomenon among $(N_{ch})^{-1}dN_{ch}/d\eta = dn/d\eta$ with different centrality cuts at $\sqrt{s_{NN}} = 130$ GeV. To explain this scaling behavior of $dn/d\eta$, we consider the stochastic approach called the Ornstein-Uhlenbeck process with two sources. Moreover, comparisons of $dn/d\eta$ at $\sqrt{s_{NN}} = 130$ GeV with that at $\sqrt{s_{NN}} = 200$ GeV have been made. A possible detection method of the quark-gluon plasma (QGP) thorough $dn/d\eta$ is presented.

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