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.

arXiv comment4 pages, Proceedings of XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2014), May 19-24, 2014, Darmstadt

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