Speaker
Kang Seog Lee
(Chonnam National University)
Description
Production of K* in the relativistic heavy-ion collisions at LHC draws strong interest since the ratio involving K* mesons such as K*/pi or K*/K+ doesn’t fit to the statistical model calculations while most of other ratios fit nicely. The reason is possibly that the K* doesn’t chemically freeze-out at the same temperature $T_{ch}$ as other particles do. Rather K* maintains partial chemical equilibrium through the process $K* \rightarrow K+ + \pi$ until the thermal freeze-out temperature, $T_{th}$. In this presentation, after fitting the momentum spectra of measured hadrons and ratios involving them measured by the ALICE collaborations with a blast-wave model which assumes the chemical freeze-out at higher $T_{ch}$ and the thermal freeze-out at lower $T_{th}$, the ratio $K*/\pi$ is calculated from the parameters thus obtained assuming the partial chemical equilibration of K*, K and $pi$ until $T_{th}$, and the result is compared with the data.
Author
Kang Seog Lee
(Chonnam National University)
Co-author
Dr
Suk Choi
(RISP, IBS)
