Neutral pion production at midrapidity in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV

Abstract

Invariant yields of neutral pions at midrapidity in the transverse momentum range $0.6<p_T<12GeV/c$ measured in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV are presented for six centrality classes. The pp reference spectrum was measured in the range $0.4<p_T<10GeV/c$ at the same center-of-mass energy. The nuclear modification factor, $R_{\mathrm{AA}}$, shows a suppression of neutral pions in central Pb-Pb collisions by a factor of up to about $8-10$ for $5\lesssim p_T\lesssim 7GeV/c$. The presented measurements are compared with results at lower center-of-mass energies and with theoretical calculations.

31 pages, 11 captioned figures, 4 tables, authors from page 26, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2151

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