Higher order fluctuations of strangeness and flavour hierarchy

FAIR Next Generation ScientistS 2014

Mantovani Sarti, V.^1 ; Alba, P.^1 ; Alberico, W.^1 ; Bellwied, R.^2 ; Bluhm, M.^3 ; Nahrgang, M.^4 ; Ratti, C.^1,2

Department of Physics, University of Turin, Italy^1

University of Houston, United States^2

North Carolina State University, United States^3

Duke University, United States^4

关键词: Freeze out temperature;    Hadron resonance gas;    Heavy ion collision;    Higher order cumulants;    Higher order moments;    Particle multiplicity;    Preliminary analysis;    Sensitivity profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/599/1/012022/pdf
DOI  :  10.1088/1742-6596/599/1/012022

来源: IOP

【 摘 要 】

We present a preliminary analysis on the sensitivity to the chemical freeze-out temperature of higher order moments of strange particle multiplicity distributions in heavy ion collisions. Within the Hadron Resonance Gas (HRG) model we evaluate ratios of cumulants for kaons (K±) and hyperons (Λ, Σ±, Ξ-,0, Ω-) as a function of the temperature and compare them to the sensitivity profiles obtained from ratios of particle yields. We show that ratios of higher order fluctuations of strange baryons could provide a useful tool to extract the range of freeze-out temperature, once experimental data are available. Finally, a connection to lattice data through the fourth to second cumulant ratio is made. The deconfinement transition on the lattice seems to indicate the possibility of a flavour hierarchy, namely strange quarks seem to deconfine at a higher temperature. We would like to test the possibility for the same scenario to occur at the chemical freeze-out and we show how the inclusion of multi-strange baryons in the evaluation of higher order cumulants might provide a sensitive observable to extract the freeze-out temperature.