Resonances from AMPT

Che Ming Ko,A Badalà,M Bleicher,J Stroth,L Fabbietti,R.F Rapp,C Markert

doi:10.1051/epjconf/20123600014

Abstract

A multiphase transport (AMPT) model that includes both initial partonic and final hadron rescattering effects in relativistic heavy ion collisions is briefly reviewed. Particular attention is given to the scattering processes in the hadronic phase in order to address resonances production in these collisions. As an example, phi meson production is discussed in detail through both its dikaon and dilepton decay channels. Results from the AMPT model for heavy ion collisions at both SPS and RHIC are compared to the experimental data to extract information on the production mechanism and in-medium properties of the phi meson.

Highlights

The study of resonances in relativistic heavy ion collisions offers the possibility to investigate their in-medium properties as well as those of the hot and dense matter produced in these collisions
In the string melting version of the A multiphase transport (AMPT) model [13], hadrons that would have been produced from the heavy ion jet interaction generator (HIJING) model through the fragmentation of strings with attached minijets are converted to their valence quarks and/or antiquarks to take into account the effect due to the larger initial energy density in ultra-relativistic heavy ion collisions than the critical energy density for the hadronic matter to quark-gluon plasma transition
Using the phi meson as an example, we have discussed via the default AMPT model, which only has minijets during the initial partonic stage, how its yield depends on whether it is measured through its dikaon or dimuon decay channels

Summary

Introduction

The study of resonances in relativistic heavy ion collisions offers the possibility to investigate their in-medium properties as well as those of the hot and dense matter produced in these collisions. The yield of Λ(1520) relative that of Λ(1115) [3] has been found to be signi¿cantly less than that predicted by the thermal model [4], which has been very successful in describing the relative yields of stable hadrons In this model, the abundance of produced particles is ¿xed at the chemical freeze out temperature that is close to the critical temperature at which the initially produced quarkgluon plasma undergoes a phase transition to the hadronic matter. From comparing the results from AMPT on phi mesons with experimental data from heavy ion collisions at SPS and RHIC, I further discuss what one can learn from relativistic heavy ion collisions about the properties of phi mesons in medium

The AMPT model

The ART model

In-medium effect

Findings

Summary