Measurement of neutral mesons in pp and Pb-Pb collisions at mid-rapidity with ALICE

Abstract

One of the key signatures of the Quark-Gluon Plasma (QGP), is the modification of hadron transverse momentum differential cross-sections in heavy-ion collisions (HIC) as compared to proton-proton (pp) collisions. Suppression of hadron production at high transverse momenta (\pt)~in HIC has been explained by the energy loss of the partons produced in the hard scattering processes which traverse the deconfined quantum chromodynamic (QCD) matter. The dependence of the observed suppression on the \pt~ of the measured hadron towards higher \pt~ is an important input for the theoretical understanding of jet quenching effects in the QGP and the nature of the energy loss. The ALICE experiment at the Large Hadron Collider (LHC) performs measurements of neutral meson inclusive spectra at mid-rapidity in a wide \pt~ range in $pp$, $p$-Pb and Pb-Pb collisions. Neutral mesons (${\pi }^0$, $\eta$, $\omega$) are reconstructed via complementary methods, using the ALICE electromagnetic calorimeters, PHOS and EMCal, and by the central tracking system, identifying photons converted into $e^{+}{e}^{-}$ pairs in the material of the inner barrel detectors (TPC and ITS). In this presentation, an overview of current ${\pi }^0$ and $\eta$ measurements by the ALICE experiment in HIC and pp collisions will be given.

4 pages 7 figures QM2015 international conference

References in corpus (7)

• Glauber Modeling in High Energy Nuclear Collisions
• Performance of the ALICE Experiment at the CERN LHC
• Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Parton-to-Pion Fragmentation Reloaded
• Neutral pion production at midrapidity in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Suppression of High-p_T Neutral Pion Production in Central Pb+Pb Collisions at sqrt{s_NN} = 17.3 GeV Relative to p+C and p+Pb Collisions
• $\eta$ meson production of high-energy nuclear collisions at NLO

Cited by in corpus (1)

• Neutral meson production and correlation with charged hadrons in pp and Pb-Pb collisions with the ALICE experiment at the LHC