12-18 August 2012
US/Eastern timezone

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

15 Aug 2012, 12:00
20m
Palladian

Palladian

Speaker

Dmitri Peresunko (National Research Centre Kurchatov Institute (RU))

Description

Identified hadron spectra are considered to be sensitive to transport properties of strongly interacting matter produced in high-energy nucleus-nucleus collisions. We present measurements of $\pi^0$ and $\eta$ mesons at mid-rapidity in a wide transverse momentum range in pp and Pb-Pb collisions at LHC energies measured with the ALICE detector. The mesons are reconstructed via their two-photon decays by two complementary methods, using the electromagnetic calorimeters and the central tracking system for photons converted to electron-positron pairs on the material of the inner ALICE barrel tracking detectors. The spectrum and the nuclear modification factor ($R_{AA}$) of the $\pi^0$ production measured in Pb-Pb collisions at different collision centralities show a clear pattern of strong suppression with respect to pp collisions. The azimuthal anisotropy ($v_{2}$) of the $\pi^0$ production is consistent with $v_{2}$ for other hadron species. Comparison of the ALICE results on neutral mesons with those of lower-energy experiments is discussed.

Primary author

Collaboration ALICE (CERN, Geneva, Switzerland)

Presentation Materials

Peer reviewing

Paper

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