Pion, kaon, and proton production in central Pb-Pb Collisions at $\sqrt{s_{NN}}=2.76$ TeV

Abstract

In this Letter we report the first results on ${\pi }^{\pm }$, K${}^{\pm }$, p and $\mathrm{p}\overline{\mathrm{p}}$ production at mid-rapidity ($\left|y\right|<0.5$) in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV, measured by the ALICE experiment at the LHC. The $p_{\mathrm{T}}$ distributions and yields are compared to previous results at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with $\sqrt{s_{\mathrm{NN}}}$, which in hydrodynamic models is expected as a consequence of the increasing particle density. While the $\mathrm{K}/\pi$ ratio is in line with predictions from the thermal model, the $\mathrm{p}/\pi$ ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood.

15 pages, 2 captioned figures, 1 table, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2869

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