Neutral meson production in pp and Pb-Pb collisions measured by ALICE at the LHC

Abstract

The midrapidity ${\pi }^0$ nuclear modification factor, $R_{\mathrm{AA}}$, at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV in 6 centrality classes as well as the corresponding ${\pi }^0$ invariant yields in Pb-Pb and in pp collisions are presented. The transverse momentum range covered is 0.6 (0.4) GeV/$c$ $<p_{\mathrm{T}}<$ 12 (10) GeV/$c$ for Pb-Pb (pp) collisions. A suppression of neutral pions increasing with centrality is observed. The yield of charged particles associated with a high $p_{\mathrm{T}}$ neutral pion trigger (8 GeV/$c$ $<p_{\mathrm{T}}<$ 16 GeV/$c$) is measured in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV. The conditional per-trigger yield modification factor in the near and away side is in agreement with the measured one for charged particles.

4 pages, Proceedings of XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2014), May 19-24, 2014, Darmstadt

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