Speaker
Description
The two-wave quark production scenario can be investigated experimentally by measurements of balance functions of identified particle pairs [1]. In this scenario, quark-antiquark pairs produced in the earlier stages of the collision are pulled apart due to collective effects, while pairs produced during hadronization are unlikely to separate. We present the measurements of such balance functions based on an analysis of data acquired at the Large Hadron Collider (LHC) by the ALICE detector. Balance functions have been measured for identified charged-pion pairs and for identified charged-kaon pairs in Pb-Pb collisions at $\sqrt{s_{NN}}=$ 2.76 TeV. These balance functions are presented in relative pseudorapidity $\Delta\eta$, relative rapidity $\Delta y$ and relative azimuthal angle $\Delta\phi$. We observe that the charged-pion balance function widths in terms of $\Delta\eta$, $\Delta y$ and $\Delta\phi$ are narrower in central Pb-Pb collisions compared to peripheral collisions. In addition, a comparison between the balance functions of charged-pions and unidentified charged particles will be shown. We will also report on the measurements of charged-kaon balance functions. The findings in this analysis are consistent with the effects of delayed hadronization and radial flow, as well as the two-wave scenario. Detailed model comparisons are performed in order to draw more quantitative conclusions.
[1] Pratt, Phys. Rev. C 85 (2012) 014904
| Preferred Track | Correlations and Fluctuations |
|---|---|
| Collaboration | ALICE |
