Abstract
The ALICE experiment has measured the production of identified light-flavour hadrons in p-Pb and Pb-Pb collisions at 5.02 TeV in a wide range of transverse momentum. The newest ALICE results on pion, kaon and proton transverse momentum spectra, yield ratios and nuclear modification factors will be presented and discussed in comparison to lower energy results. In particular, the production of identified hadrons in most central Pb-Pb collisions relative to pp collisions is found to be strongly suppressed at high transverse momenta (pT > 8 GeV/c) whereas in p-Pb collisions the nuclear modification factors are consistent with unity. This indicates that the strong suppression of high-pT hadrons measured in central Pb-Pb collisions is not due to an initial state effect but instead to the energy loss of partons traversing a hot and dense QCD medium.
Highlights
The deconfined state of quarks and gluons, the Quark-Gluon Plasma (QGP) predicted by Quantum Chromodynamics (QCD) [1, 2, 3, 4] can be studied in ultra-relativistic heavy-ion collisions
The ALICE experiment has measured a strong suppression of hadron production at high-pT in central Pb-Pb collisions at √ssNN = 5.02 TeV, indicating that a dense and hot medium is created at the LHC energies
The transverse momentum spectra of primary charged particles are measured in the full azimuthal acceptance and within |η| < 0.8
Summary
The deconfined state of quarks and gluons, the Quark-Gluon Plasma (QGP) predicted by Quantum Chromodynamics (QCD) [1, 2, 3, 4] can be studied in ultra-relativistic heavy-ion collisions. The yield of final state hadrons at high transverse momentum will be suppressed compared to the reference value from a simple superposition of incoherent proton-proton collisions [5,6]. This observation is typically quantified in terms of the nuclear modification factor, defined as the ratio of the yield in Pb-Pb to the corresponding yield in pp collisions scaled by the number of binary nucleon-nucleon collisions. The ALICE experiment has measured a strong suppression of hadron production at high-pT in central Pb-Pb collisions at √ssNN = 5.02 TeV, indicating that a dense and hot medium is created at the LHC energies
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