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

May 20, 2014, 3:00 PM
titanium (darmstadtium)



Schlossgraben 1 64283 Darmstadt Germany
Contributed Talk Jets Jets


Ana Marin (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))


The ALICE experiment at LHC performs measurements of neutral meson inclusive spectra in mid-rapidity in a wide $p_{\rm T}$ range in pp, p-Pb and Pb-Pb collisions, as well as correlations between leading $\pi^0$ and charged hadrons. Neutral mesons $\pi^0$, $\eta$, $\omega$ are reconstructed via complementary methods, using the ALICE electromagnetic calorimeters and by the central tracking system identifying photons converted to $e^+e^-$ pairs in the material of the inner barrel detectors. Measurements of neutral meson spectra in pp collisions at energies $\sqrt{s}$ = 0.9, 2.76, 7 TeV provide valuable data for pQCD calculations and allow to study scaling properties of hadron production at the LHC energies. The study of neutral meson production in p-Pb collisions at $\sqrt{s} = 5.02$ TeV is of importance to confirm that the strong suppresion observed in central Pb-Pb collisions is a final-state effect of the produced dense medium. The nuclear modification factor $R_{\rm AA}$ of the $\pi^0$ production in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV at different collision centralities shows a clear pattern of strong suppression in a hot QCD medium with respect to pp collisions. We shall also present the current status of correlation measurements between $\pi^0$ or isolated photons triggered by the electromagnetic calorimeter EMCAL, and charged hadrons detected in the central tracker.
On behalf of collaboration: ALICE

Primary author

Ana Marin (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))

Presentation materials