Scaling Behavior Of The Transverse Momentum Spectrum Of Strange Particles Under Pb-Pb 2.76 TeV Collision

It's very important to investigate the transverse momentum spectra(pT)for different species of final state particles.From these spectra,we can understand the dynamics of particles production in high energy heavy ion collisions.There are many important methods to explore the dynamics,one of which is to find the scaling behaviour of the transverse momentum spectra.Recently,with the experimental date collected by the ALICE collaboration in Pb-Pb collisions at(?)=2.76 TeV for different centralities,we investigate the scaling behaviour of pT spectra of strange particles.We find that transverse momentum spectra of K*0,?,?,? and ? in a low regions with pT?3.6,3.9,6.5,3.3 and 4.3 GeV/c show a scaling behavior independent of the centrality.This scaling behaviour is presented when these spectra are expressed in terms of a proper scaling variable z=pT/K,where the scaling parameter K is detennined by the quality factor(QF)method.The scaling parameter K is parameterized by ?<Npart>?,where is the average value of the number of participating nucleons,? and ? are free parameters,? characterizes the rate at which lnK changes with ln<Npart>.The values of ? for K*0 and ? are consistent within uncertainties,while they are smaller than those for ??? and ?.In the high pT region,a violation of the proposed scaling is observed due to the suppression of the spectra.The more peripheral the collisions are,the more obvious violation the spectra present.In the colour string percolation(CSP)model,we argue that K*0,?,?,? and ? particles originate from the fragmentation of clusters formed by the colour strings overlapping.The cluster's fragmentation functions are different for different strange hadrons.In the low pT region,the CSP model can describe well the scaling behaviour of K*0,?,?,? and ? pT spectra at different centralities.