Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-08-16
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 7 figures, plenary talk at Quark Matter 2011, May 23rd-28th 2011, Annecy, France
Scientific paper
The ALICE experiment has been taking data since 2009, with proton and lead beams. In this paper, the different particle identification techniques used by the experiment are briefly reviewed. The current results on identified particle spectra in pp collisions at $\sqrt{s} = 900 \mathrm{GeV}$ and 7 TeV, and in Pb-Pb collisions at $\snn = 2.76 \mathrm{TeV}$ are summarized. In particular, the energy dependence of the spectral shapes and particle ratios in pp collisions is discussed and the results are compared to previous experiments and commonly used Monte Carlo models. The baryon/meson ratio $\Lambda/K^0_S$ is studied in Pb-Pb collisions as a function of transverse momentum and centrality, and it is compared to previous results. The evolution of the particle spectra in Pb-Pb with collision centrality is compared to measurements at lower energies and discussed in the context of thermal and hydrodynamical models.
Floris Michele
for the ALICE Collaboration
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