A Discuss On Resonance Production In Relativisitic Heavy Ion Collisions At The LHC Based On A Multiphase Transport Model

Ultrarelativistic heavy-ion collisions experiment which happen in the Relativistic Heavy-Ion Collider at BNL and the Large Hardron Collider at CERN are expected to create a new state of matter predicted by Quantum chromodynamics?QCD?theory.We call the matter as quark-gluon plasma?QGP?.When quarks and gluons can move freely without being bounded in the hadron size,the extremely hot and dense state of matter can be formed in the environment.High energy heavy-ion collisions have four sections included initial stage,pre-equilibrium,QGP and hydrodynamic expansion,hadronization and freeze-out.With the fireball expanding and cooling down,the hadron gas after hadronization of the QGP will experience chemical freeze-out and kinetic freeze-out.Short-lifetime resonances will decay and regenerate during the stage,which may cause the loss of resonance signal.Meanwhile,the resonance yield in the fireball may be increase by scattering among particles.We can investigate the hadronic lifetime of the fireball.And resonances with different origin contain the dynamics information of system under different time scales.Therefore,resonance is one of effective probes to obtain the property of QGP.We use a multiphase transport model based on nonequilibrium condition including the interaction between partons and between hadrons to investigate the influence of different hadron cascade time on the production of K^*0 and?resonances in the heavy-ion collisions of LHC with the string melting version.Comparing with the measurement of transverse momentum distribution about the resonances in the experiment,it is required that hadronic cascade time t?10fm/c can describe the bigger collision system,that is Pb-Pb collisions at?^sNN?^1/2=2.76TeV.As for the smaller p-Pb collisions at?^sNN?^1/2=5.02TeV,we need a lower limit of hadron cascade t?4fm/c.It suggerts a longer hadronic lifetime should be described in Pb-Pb collisions.Besides,the impact of hadron rescattering on?is less than K^*0.With the comparison of K^*0/K^—and?/K^—in central collisions of Pb-Pb,the strong suppression about K^*0 illustrates the loss of further K^*0 signal.As the hadron cascade time increases,the elliptic flow of K^*0 has a bigger change than?,which improves the rescattering has a greater proportion than regeneration.And we can also get it with the observation about K^*0/K,?/K,K^*0/?,?/?.In addition,the calculation with the AMPT model of string melting scenario can describe p/?ratios in central collision well at 0-5GeV/C revealing hydrodynamics mechanism.