Speaker
Description
Two-particle transverse momentum correlator $G_{2}$ was measured based on data collected from Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 2.76\;\text{TeV}$. The evolution of the longitudinal width of the $G_{2}$ correlator vs. collision centrality nominally provides information about the specific shear viscosity, $\eta/s$, of the medium formed in the collisions. The $G_{2}$ correlator was also measured in pp and p--Pb collisions at $\sqrt{s} = 7\;\text{TeV}$ and $\sqrt{s_{\rm NN}} = 5.02\;\text{TeV}$, respectively, to investigate the presence of viscous effects in these smaller systems. No longitudinal broadening was observed. These smaller systems are either too small or too short-lived to manifest viscous effects based on the $G_{2}$ observable.
In this contribution, identified charged particles $G_{2}$ in pp, p--Pb, and Pb--Pb collisions at the same nucleon--nucleon collision energy ($\sqrt{s_{\rm NN}} =$ 5.02 TeV) in different multiplicity classes measured with the ALICE detector are presented. The results shed light on potential mass-ordering effects and system size dependence, leaving aside collision energy dependent effects.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | ALICE |
