Centrality Dependence of K*(892)(0) and phi(1020) Production at LHC

作者：Bashir Inam ul; Uddin Saeed

来源：Communications in Theoretical Physics, 2017, 68(4): 500-504.

DOI：10.1088/0253-6102/68/4/500

• statistical model
• kinetic freeze-out
• chemical freeze-out
• collective flow

We study the centrality dependence of the mid-rapidity (vertical bar y vertical bar < 0.5) yields and transverse momentum distributions of K* (892) 0 and.(1020) resonances produced in Pb + Pb collisions at root sNN = 2.76 TeV. The midrapidity density (dN/dy) and the shape of the transverse momentum spectra are well reproduced by an earlier proposed Unified Statistical Thermal Freeze-out Model (USTFM), which incorporates the effects of both longitudinal as well as transverse hydrodynamic flow. The freeze-out properties in terms of kinetic freeze-out temperature and transverse flow velocity parameter are extracted from the model fits to the transverse momentum data provided by the ALICE experiment at the LHC. The kinetic freeze-out temperature is found to increase with decreasing event centrality while the transverse flow velocity parameter shows a mild decrease on moving towards peripheral collisions. Moreover the centrality dependence of the mid-rapidity system size at freeze-out has also been studied in terms of transverse radius parameter.

• 出版日期2017-10