Speaker
Description
The pseudorapidity distributions and anisotropic flow coefficients of charged particles produced in heavy ion collisions are key observables that characterize the initial conditions and subsequent hydrodynamic evolution of the quark-gluon plasma. Recent LHC Run 3 lead-lead (PbPb) data collected at a center-of-mass per nucleon pair of $\sqrt{s_{_{\mathrm{NN}}}} = 5.36$~TeV allow the study of these effects at a record collision energy. We present the first measurements of the midrapidity charged particle $\mathrm{d}N/\mathrm{d}\eta$ as a function of collision centrality, as well as the Fourier harmonics, $v_{2}$ and $v_{3}$, with two- and four-particle correlations in PbPb collisions recorded at $\sqrt{s_{_{\mathrm{NN}}}} = 5.36$~TeV with the CMS experiment. Taken together, these measurements constrain models of the collision-energy and centrality-dependence of charged particle production, and also shed light on the initial collision geometry and importance of event-by-event fluctuations. These data are compared to similar measurements at different energies, including PbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}} = 5.02$ and xenon-xenon collisions at $\sqrt{s_{_{\mathrm{NN}}}} = 5.44$~TeV.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | CMS |
