Research On Scaling P_T Distribution In High Energy Collisions

In high energy nucleus-nucleus collisions,there are a lot of final state particles produced.How are these particles produced still puzzles us.Consequently,the research of the particle distributions is significantly important for understanding the evolution of the high energy heavy ion collision and the particle production mechanics. The scaling behavior in the high energy collisions is getting more and more attentions. Based on the the research of scaling distribution of final state particles,we may probably find the coherent and universal physics in the particle production mechanics. With the experimental data from STAR,PHENIX,and BRAHMS on the centrality and rapidity dependence of the p_T spectrum in Au+Au and d+Au collisions,we show that there exists a scaling behavior which is independent of the colliding system, centrality and(pseudo)rapidity ofπ.Using this scaling distribution,we get the theoretical psedorapidity asymmetry which is basically in agreement with STAR data in the regions of 0≤|η|≤0.5 and 0.5≤|η|≤1.In the same way,we show that there also exists a scaling distribution for proton and anti-proton,independent of the centrality and rapidity in Au+Au collisions at 200 GeV.There is a little difference between the scaling functions for proton and antiproton,but there are very different from that forπ′s.It is not surprising,because the distribution reflects the particle production dynamics which may be different for different particles.We predict that the scaling function is different for different particles.It is correct forπ,proton and anti-proton.But in d+Au collisions,can the same scaling functions describe the proton and anti-proton distribution? Do the similar scaling functions for other final state particles still exist? This is under consideration.The research of scaling behavior will enrich the knowledge of particle production mechanisms.