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

Marín, A. and Abelev, B. and Adam, J. and Adamová, D. and Aggarwal, M. M. and Aglieri, Rinella G. and Agnello, M. and Agostinelli, A. and Agrawal, N. and Ahammed, Z. and Ahmad, N. and Ahmed, I. and Ahn, S. U. and Ahn, S. A. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Alam, S. N. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Alves, Garcia Prado C. and Andrei, C. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Kiss, Gábor and Varga-Kőfaragó, Mónika and Lévai, Péter and Oláh, László and Pochybova, Sona (2014) Neutral meson production in pp and Pb–Pb collisions measured by ALICE at the LHC. NUCLEAR PHYSICS A, 931. pp. 438-443. ISSN 0375-9474

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Abstract

The midrapidity π0 nuclear modification factor, RAA, at √sNN = 2.76 TeV in 6 centrality classes as well as the corresponding π0 invariant yields in Pb-Pb and in pp collisions are presented. The transverse momentum range covered is 0.6 (0.4) GeV/c < pT < 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 pT neutral pion trigger (8 GeV/c < pT < 16 GeV/c) is measured in pp and Pb-Pb collisions at √sNN = 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.

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